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Effective Date: August 22, 2007
Mandatory Compliance Date: February 22, 2008
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Technical Standards Document
Number 209, Revision 0
Seat Belt Assemblies
(Ce document
est aussi disponible en français.)
Introduction
As defined by section
12 of the Motor Vehicle Safety Act, a Technical Standards Document
(TSD) is a document that reproduces an enactment of a foreign government
(e.g. a Federal Motor Vehicle Safety Standard issued by the U.S. National
Highway Traffic Safety Administration). According to the Act, the Motor
Vehicle Safety Regulations may alter or override some provisions
contained in a TSD or specify additional requirements; consequently, it
is advisable to read a TSD in conjunction with the Act and its counterpart
Regulation. As a guide, where the corresponding Regulation contains additional
requirements, footnotes indicate the amending subsection number.
TSDs are revised from time to time in order to incorporate amendments
made to the reference document, at which time a Notice of Revision is
published in the Canada Gazette, Part I. All TSDs are assigned
a revision number, with "Revision 0" designating the original version.
Identification of Changes
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changes may be made to the foreign enactment. These may include the deletion
of words, phrases, figures, or sections that do not apply under the Act
or Regulations, the conversion of imperial to metric units, the deletion
of superseded dates, and minor changes of an editorial nature. Additions
are underlined, and provisions that do not apply are stroked
through. Where an entire section has been deleted, it is replaced
by: "[CONTENT DELETED]". Changes are also made where there is
a reporting requirement or reference in the foreign enactment that does
not apply in Canada. For example, the name and address of the U.S. Department
of Transportation are replaced by those of the Department of Transport.
Effective Date and Mandatory Compliance Date
Compliance with the requirements of a TSD that is being introduced for
the first time is not mandatory until six months after publication in
the Canada Gazette, Part II, of the Regulations that incorporate
the TSD. In the case of a revision, compliance becomes mandatory six months
after publication of the Notice of revision in the Canada Gazette,
Part I, as long as the requirements of the previous version continue to
be met. Voluntary compliance is permitted as of the Effective Date of
the TSD.
Official Version of Technical Standards Documents
Technical Standards Documents may be consulted electronically in both
HTML and Portable Document Format (PDF) on the Department of Transports
Web site at www.tc.gc.ca/RoadSafety/mvstm_tsd/index_e.htm.
The PDF version is a replica of the TSD as published by the Department
and is to be used for the purposes of legal interpretation and application.
The HTML version is provided for information purposes only.
(Original signed by)
Director, Standards Research and Development
for the Minister of Transport, Infrastructure
and Communities
Ottawa, Ontario
Technical Standards Document
Number 209, Revision 0
SEAT BELT ASSEMBLIES
The text of this document is based on Federal Motor Vehicle Safety
Standard No. 209, Seat Belt Assemblies, as published in the U.S. Code
of Federal Regulations, Title 49, Part 571, revised as of October
1, 2006.
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S1. Purpose and Scope
This Technical Standards Document (TSD) standard specifies
requirements for seat belt assemblies.
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S3. Definitions
1 Adjustment hardware means
any or all hardware designed for adjusting the size of a seat belt assembly
to fit the user, including such hardware that may be integral with a buckle,
attachment hardware, or retractor. (Pièces de réglage)
1 Attachment hardware means
any or all hardware designed for securing the webbing of a seat belt assembly
to a motor vehicle. (Pièces de fixation)
1 Automatic-locking retractor
means a retractor incorporating adjustment hardware by means of a positive
self-locking mechanism which is capable, when locked, of withstanding
restraint forces. (Rétracteur autobloquant)
1 Buckle means a quick
release connector which fastens a person in a seat belt assembly.
(Attache)
1 Emergency-locking retractor
means a retractor incorporating adjustment hardware by means of a locking
mechanism that is activated by vehicle acceleration, webbing movement
relative to the vehicle, or other automatic action during an emergency
and is capable when locked of withstanding restraint forces. (Rétracteur
à blocage d’urgence)
1 Hardware means any
metal or rigid plastic part of a seat belt assembly. (Pièces)
1 Load-limiter means
a seat belt assembly component or feature that controls tension on the
seat belt to modulate the forces that are imparted to occupants restrained
by the belt assembly during a crash. (Limiteur de charge)
1 Nonlocking retractor
means a retractor from which the webbing is extended to essentially
its full length by a small external force, which provides no adjustment
for assembly length, and which may or may not be capable of sustaining
restraint forces at maximum webbing extension. (Rétracteur
sans blocage)
1 Pelvic restraint means
a seat belt assembly or portion thereof intended to restrain movement
of the pelvis. (Ceinture sous-abdominale)
1 Retractor means a
device for storing part or all of the webbing in a seat belt assembly.
(Rétracteur)
Seat back retainer means the portion of some seat
belt assemblies designed to restrict forward movement of a seat back.
(Dispositif de maintien du dossier)
1 Seat belt assembly means
any strap, webbing, or similar device designed to secure a person in a
motor vehicle in order to mitigate the results of any accident, including
all necessary buckles and other fasteners, and all hardware designed for
installing such seat belt assembly in a motor vehicle. (Ceinture
de sécurité)
1 Strap means a narrow nonwoven
material used in a seat belt assembly in place of webbing. (Courroie)
1 Type 1 seat belt assembly is
a lap belt for pelvic restraint. (Ceinture de sécurité
de type 1)
1 Type 2 seat belt assembly is
a combination of pelvic and upper torso restraints. (Ceinture de
sécurité de type 2)
1 Type 2a shoulder belt is
an upper torso restraint for use only in conjunction with a lap belt as
a Type 2 seat belt assembly. (Ceinture diagonale de type 2a)
1 Upper torso restraint means
a portion of a seat belt assembly intended to restrain movement of the
chest and shoulder regions. (Ceinture-baudrier)
1 Webbing means a narrow fabric
woven with continuous filling yarns and finished selvages. (Sangle)
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(a) Incorporation by reference. SAE Recommended Practice J211-1
rev. December 2003, Instrumentation for Impact Test—Part 1—Electronic
Instrumentation, is incorporated by reference in S5.2(j) and is hereby
made part of this TSD Standard. This incorporation by
reference was approved by the Director of the Federal Register in accordance
with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies of SAE Recommended
Practice J211-1 rev. December 2003, Instrumentation for Impact Test—Part
1—Electronic Instrumentation, may be obtained from the Society
of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA
15096-0001. [TWO SENTENCES DELETED].
(b) Single occupancy. A seat belt assembly shall be designed
for use by one, and only one, person at any one time.
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(c) Upper torso restraint. A Type 2 seat belt assembly shall provide
upper torso restraint without shifting the pelvic restraint into the abdominal
region. An upper torso restraint shall be designed to minimize vertical
forces on the shoulders and spine. Hardware for upper torso restraint
shall be so designed and located in the seat belt assembly that the possibility
of injury to the occupant is minimized. A Type 2a shoulder belt shall
comply with applicable requirements for a Type 2 seat belt assembly in
S4.1 to S4.4, inclusive.
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(d) Hardware. All hardware parts which contact under normal usage
a person, clothing, or webbing shall be free from burrs and sharp edges.
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(e) Release. A Type 1 or Type 2 seat belt assembly shall be provided
with a buckle or buckles readily accessible to the occupant to
permit his easy and rapid removal from the assembly.3
The buckle release mechanism shall be designed to minimize the possibility
of accidental release. A buckle with a release mechanism in the latched
position shall have only one opening in which the tongue can be inserted
on the end of the buckle designed to receive and latch the tongue.
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(f) Attachment hardware. A seat belt assembly shall include
all hardware necessary for installation in a motor vehicle in accordance
with Society of Automotive Engineers Recommended Practice J800c, Motor
Vehicle Seat Belt Installation, November 1973. However, seat belt
assemblies designed for installation in motor vehicles equipped with seat
belt assembly anchorages that do not require anchorage nuts, plates, or
washers need not have such hardware, but shall have 7/16-20 UNF-2A or
½-13 UNC-2A attachment bolts or equivalent metric hardware.
The hardware shall be designed to prevent attachment bolts and other parts
from becoming disengaged from the vehicle while in service. Reinforcing
plates or washers furnished for universal floor installations shall be
of steel, free from burrs and sharp edges on the peripheral edges adjacent
to the vehicle, at least 1.5 mm in thickness, and at least 2580 mm2,
in projected area. The distance between any edge of the plate and the
edge of the bolt hole shall be at least 15 mm. Any corner shall be rounded
to a radius of not less than 6 mm or cut so that no corner angle is less
than 135 degrees and no side is less than 6 mm in length.
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(g) Adjustment. [CONTENT DELETED]4
(h) Webbing. The ends of webbing in a seat belt assembly shall
be protected or treated to prevent raveling. The end of webbing in a seat
belt assembly having a metal-to-metal buckle that is used by the occupant
to adjust the size of the assembly shall not pull out of the adjustment
hardware at maximum size adjustment. Provision shall be made for essentially
unimpeded movement of webbing routed between a seat back and seat cushion
and attached to a retractor located behind the seat.
(i) Strap. A strap used in a seat belt assembly to sustain restraint
forces shall comply with the requirements for webbing in S4.2, and if
the strap is made from a rigid material, it shall comply with applicable
requirements in S4.2, S4.3, and S4.4.
(j) Marking. Each seat belt assembly shall be permanently and
legibly marked or labeled with year of manufacture, model, and name or
trademark of manufacturer, distributor, or importer if manufactured
outside the United States. A model shall consist of a single combination
of webbing having a specific type of fiber weave and construction, and
hardware having a specific design. Webbings of various colors may be included
under the same model, but webbing of each color shall comply with the
requirements for webbing in S4.2.
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(k) Installation instructions. [CONTENT DELETED]
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(l) Usage and maintenance instructions.5
A seat belt assembly or retractor shall be accompanied by written instructions
for the proper use of the assembly, stressing particularly the importance
of wearing the assembly snugly and properly located on the body, and on
the maintenance of the assembly and periodic inspection of all components.
The instructions shall show the proper manner of threading webbing in
the hardware of seat belt assemblies in which the webbing is not permanently
fastened. Instructions for a nonlocking retractor shall include a caution
that the webbing must be fully extended from the retractor during use
of the seat belt assembly unless the retractor is attached to the free
end of webbing which is not subjected to any tension during restraint
of an occupant by the assembly.6 Instructions
for Type 2a shoulder belt shall include a warning that the shoulder belt
is not to be used without a lap belt.
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(m) Workmanship. [CONTENT DELETED]7
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(a) Width. The width of the webbing in a seat belt assembly shall
be not less than 46 mm, except for portions that do not touch a 95th
percentile adult male with the seat in any adjustment position and the
seat back in the manufacturer’s nominal design riding position when
measured under the conditions prescribed in S5.1(a).
(b) Breaking strength. The webbing in a seat belt assembly shall
have not less than the following breaking strength when tested by the
procedures specified in S5.1(b): Type 1 seat belt assembly — 26,689
N; Type 2 seat belt assembly — 22,241 N for webbing in pelvic restraint
and 17,793 N for webbing in upper torso restraint.
(c) Elongation. Except as provided in S4.5, the webbing in a seat
belt assembly shall not extend to more than the following elongation when
subjected to the specified forces in accordance with the procedure specified
in S5.1(c): Type 1 seat belt assembly — 20 percent at 11,120 N;
Type 2 seat belt assembly — 30 percent at 11,120 N for webbing in
pelvic restraint; and 40 percent at 11,120 N for webbing in upper torso
restraint.
(d) Resistance to abrasion. The webbing of a seat belt assembly,
after being subjected to abrasion as specified in S5.1(d) or S5.3(c),
shall have a breaking strength of not less than 75 percent of the breaking
strength listed in S4.2(b) for that type of belt assembly.
(e) Resistance to light. The webbing in a seat belt assembly,
after exposure to the light of a carbon arc and tested by the procedure
specified in S5.1(e), shall have a breaking strength not less than 60
percent of the strength before exposure to the carbon arc and shall have
a color retention not less than No. 2 on the Geometric Gray Scale
for Color Change published by the American Association of Textile
Chemists and Colorists, Post Office Box 12215, Research Triangle Park,
NC 27709 886, Durham, NC.
(f) Resistance to micro-organisms. The webbing in a seat belt
assembly, after being subjected to micro-organisms and tested by the procedures
specified in S5.1(f), shall have a breaking strength not less than 85
percent of the strength before subjection to micro-organisms.
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(1) Attachment hardware of a seat belt assembly, after being subjected
to the conditions specified in S5.2(a), shall be free of ferrous corrosion
on significant surfaces except, for permissible ferrous corrosion at peripheral
edges or edges of holes on underfloor reinforcing plates and washers.
Alternatively, such hardware at or near the floor shall be protected against
corrosion by at least an electrodeposited coating of nickel plus chromium,
or copper and nickel plus chromium with at least a service condition
number of SC2, and other attachment hardware shall be protected by an
electrodeposited coating of nickel plus chromium, or copper and
nickel plus chromium with a service condition number of SC1, in
accordance with American Society for Testing and Materials B 456-79, Standard
Specification for Electrodeposited Coatings of Copper Plus Nickel Plus
Chromium and Nickel Plus Chromium,9
but such hardware shall not be racked for electroplating in locations
subjected to maximum stress.
(2) Surfaces of buckles, retractors, and metallic parts, other than attachment
hardware, of a seat belt assembly, after subjection to the conditions
specified in S5.2(a), shall be free of ferrous or nonferrous corrosion
which may be transferred, either directly or by means of the webbing,
to the occupant or his clothing when the assembly is worn. After test,
buckles shall conform to applicable requirements in paragraphs (d) to
(g) of this section.
(b) Temperature resistance. Plastic or other nonmetallic hardware
parts of a seat belt assembly, when subjected to the conditions specified
in S5.2(b), shall not warp or otherwise deteriorate to cause the assembly
to operate improperly or fail to comply with applicable requirements in
this section and S4.4.
(c) Attachment hardware
(1) Eye bolts, shoulder bolts, or other bolts used to secure the pelvic
restraint of a seat belt assembly to a motor vehicle shall withstand a
force of 40,034 N when tested by the procedure specified in S5.2(c)(1),
except that attachment bolts of a seat belt assembly designed for installation
in specific models of motor vehicles in which the ends of two or more
seat belt assemblies cannot be attached to the vehicle by a single bolt
shall have breaking strength of not less than 22,241 N.
(2) Other attachment hardware designed to receive the ends of two seat
belt assemblies shall withstand a tensile force of at least 26,689 N without
fracture of a section when tested by the procedure specified in S5.2(c)(2).
(3) A seat belt assembly having single attachment hooks of the quick-disconnect
type for connecting webbing to an eye bolt shall be provided with a retaining
latch or keeper which shall not move more than 2 mm in either the vertical
or horizontal direction when tested by the procedure specified in S5.2(c)(3).
(d) Buckle release
(1) The buckle of a Type 1 or Type 2 seat belt assembly shall release
when a force of not more than 133 N is applied as specified in S5.2(g).
(2) A buckle designed for push-button application of buckle release force
shall have a minimum push-button area of 452 mm2 with
a minimum linear dimension of 10 mm for applying the release force, or
a buckle designed for lever application of buckle release force shall
permit the insertion of a cylinder 10 mm in diameter and 38 mm in length
to at least the midpoint of the cylinder along the cylinder’s entire
length in the actuation portion of the buckle release. A buckle having
another design for release shall have adequate access for two or more
fingers to actuate release.
(3) The buckle of a Type 1 or Type 2 seat belt assembly shall not release
under a compressive force of 1,779 N applied as prescribed in paragraph
S5.2(d)(3). The buckle shall be operable and shall meet the applicable
requirement of paragraph S4.4 after the compressive force has been removed.
(e) Adjustment force. The force required to decrease the size
of a seat belt assembly shall not exceed 49 N when measured by the procedure
specified in S5.2(e).
(f) Tilt-lock adjustment. The buckle of a seat belt assembly having
tilt-lock adjustment shall lock the webbing when tested by the procedure
specified in S5.2(f) at an angle of not less than 30 degrees between the
base of the buckle and the anchor webbing.
(g) Buckle latch. The buckle latch of a seat belt assembly, when
tested by the procedure specified in S5.2(g), shall not fail, nor gall
or wear to an extent that normal latching and unlatching is impaired,
and a metal-to-metal buckle shall separate when in any position of partial
engagement by a force of not more than 22 N.
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(h) Nonlocking retractor. [CONTENT DELETED]10
(i) Automatic-locking retractor. The webbing of a seat belt assembly
equipped with an automatic-locking retractor, when tested by the procedure
specified in S5.2(i), shall not move more than 25 mm between locking positions
of the retractor, and shall be retracted with a force under zero acceleration
of not less than 3 N when the retractor is attached to a pelvic
restraint, and not less than 2 N nor more than 5 N in any strap or webbing
that contacts the shoulders of an occupant when the retractor is attached
to the upper torso restraint. An automatic-locking retractor attached
to an upper torso restraint shall not increase the restraint on the occupant
of the seat belt assembly during use in a vehicle traveling over rough
roads as prescribed in S5.2(i).
(j) Emergency-locking retractor
(1) For seat belt assemblies manufactured before February 22, 2007. Except
for manufacturers that, at the manufacturer’s option, voluntarily
choose to comply with S4.3(j)(2) during this period (with said option
irrevocably selected prior to, or at the time of, certification of the
seat belt assembly), an emergency-locking retractor of a Type 1 or Type
2 seat belt assembly, when tested in accordance with the procedures specified
in paragraph S5.2(j)(1),
(i) Shall lock before the webbing extends 25 mm when the retractor is
subjected to an acceleration of 7 m/s2 (0.7 g);
(ii) Shall not lock, if the retractor is sensitive to webbing withdrawal,
before the webbing extends 51 mm when the retractor is subjected to an
acceleration of 3 m/s2 (0.3 g) or less;
(iii) Shall not lock, if the retractor is sensitive to vehicle acceleration,
when the retractor is rotated in any direction to any angle of 15 degrees
or less from its orientation in the vehicle;
(iv) Shall exert a retractive force of at least 3 N under zero acceleration
when attached only to the pelvic restraint;
(v) Shall exert a retractive force of not less than 1 N and not more
than 5 N under zero acceleration when attached only to an upper torso
restraint;
(vi) Shall exert a retractive force of not less than 1 N and not more than
7 N under zero acceleration when attached to a strap or webbing that restrains
both the upper torso and the pelvis.
(2) For seat belt assemblies manufactured on or after February 22, 2007,
and for manufacturers opting for early compliance. An emergency-locking
retractor of a Type 1 or Type 2 seat belt assembly, when tested in accordance
with the procedures specified in paragraph S5.2(j)(2),
(i) Shall under zero acceleration loading
(A) Exert a retractive force of not less than 1 N and not more than
7 N when attached to a strap or webbing that restrains both the upper
torso and the pelvis;
(B) Exert a retractive force of not less than 3 N when attached only
to the pelvic restraint; and
(C) Exert a retractive force of not less than 1 N and not more than
5 N when attached only to an upper torso restraint
(D) For a retractor sensitive to vehicle acceleration, lock when tilted
at any angle greater than 45 degrees from the angle at which it is installed
in the vehicle or meet the requirements of S4.3(j)(2)(ii).
(E) For a retractor sensitive to vehicle acceleration, not lock when
the retractor is rotated in any direction to any angle of 15 degrees or
less from its orientation in the vehicle.
(ii) Shall lock before the webbing payout exceeds the maximum limit
of 25 mm when the retractor is subjected to an acceleration of 0.7 g under
the applicable test conditions of S5.2(j)(2)(iii)(A) or (B). The retractor
is determined to be locked when the webbing belt load tension is at least
35 N
(iii) For a retractor sensitive to webbing withdrawal, shall not lock
before the webbing payout extends to the minimum limit of 51 mm when the
retractor is subjected to an acceleration no greater than 0.3 g under
the test condition of S5.2(j)(2)(iii)(C).
(k) Performance of retractor. A retractor used on a seat belt
assembly after subjection to the tests specified in S5.2(k) shall comply
with the applicable requirements in paragraphs (h) to (j) of this section
and S4.4, except that the retraction force shall be not less than 50 percent
of its original retraction force.
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(a) Type 1 seat belt assembly. Except as provided in S4.5,
the complete seat belt assembly, including webbing, straps, buckles,
adjustment and attachment hardware, and retractors, shall comply with
the following requirements when tested by the procedures specified in
S5.3(a):
(1) The assembly loop shall withstand a force of not less than 22,241
N; that is, each structural component of the assembly shall withstand
a force of not less than 11,120 N.
(2) The assembly loop shall extend not more than 7 inches or 178
mm when subjected to a force of 22,241 N; that is, the length of the
assembly between anchorages shall not increase more than 356 mm.
(3) Any webbing cut by the hardware during the test shall have a
breaking strength at the cut of not less than 18,683 N.
(4) Complete fracture through any solid section of metal attachment
hardware shall not occur during the test.
(b) Type 2 seat belt assembly. Except as provided in S4.5,
the components of a Type 2 seat belt assembly, including webbing, straps,
buckles, adjustment and attachment hardware, and retractors, shall comply
with the following requirements when tested by the procedure specified
in S5.3(b):
(1) The structural components in the pelvic restraint shall withstand
a force of not less than 11,120 N.
(2) The structural components in the upper torso restraint shall
withstand a force of not less than 6,672 N.
(3) The structural components in the assembly that are common to
pelvic and upper torso restraints shall withstand a force of not less
than 13,345 N.
(4) The length of the pelvic restraint between anchorages shall
not increase more than 508 mm when subjected to a force of 11,120
N.
(5) The length of the upper torso restraint between anchorages shall
not increase more than 508 mm when subjected to a force of 6,672 N.
(6) Any webbing cut by the hardware during the test shall have a
breaking strength of not less than 15,569 N at a cut in the webbing
of the pelvic restraint, or not less than 12,455 N at a cut in the
webbing of the upper torso restraint.
(7) Complete fracture through any solid section of metal attachment
hardware shall not occur during the test.
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(a) A Type 1 or Type 2 seat belt assembly that includes a load-limiter
is not required to comply with the elongation requirements of S4.2(c),
S4.4(a)(2), S4.4(b)(4), or S4.4(b)(5).
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(a) Width. The width of the webbing from three seat belt assemblies
shall be measured after conditioning for at least 24 hours in an atmosphere
having a relative humidity between 48 and 67 percent and a temperature
of 23 ± 2ºC. The tension during the measurement of the width
shall be not more than 22 N on the webbing from a Type 1 seat belt assembly,
and 9,786 ± 450 N on the webbing from a Type 2 seat belt assembly.
The width of the webbing from a Type 2 seat belt assembly may be measured
during the breaking strength test described in paragraph (b) of this section.
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(b) Breaking strength. The webbing from three seat belt assemblies
shall be conditioned in accordance with paragraph (a) of this section
and tested for breaking strength in a testing machine of a capacity verified
to have an error of not more than one percent in the range of the breaking
strength of the webbing in accordance with American Society for Testing
and Materials E 4-79, Standard Methods of Load Verification of Testing
Machines.15 The machine shall be
equipped with split drum grips, as illustrated in Figure 1, having a diameter
between 51 and 102 mm. The rate of grip separation shall be between 51
and 102 mm per minute. The distance between the centers of the grips at
the start of the test shall be between 102 and 254 mm. After placing the
specimen in the grips, the webbing shall be stretched continuously at
a uniform rate to failure. Each value shall be not less than the applicable
breaking strength requirement in S4.2(b), but the median value shall be
used for determining the retention of breaking strength in paragraphs
(d), (e), and (f) of this section.
(c) Elongation. Elongation shall be measured during the breaking
strength test described in paragraph (b) of this section by the following
procedure: A preload between 196 N and 245 N shall be placed on the webbing
mounted in the grips of the testing machine and the needle points of an
extensometer, in which the points remain parallel during the test, are
inserted in the center of the specimen. Initially the points shall be
set at a known distance apart between 102 and 203 mm. When the force on
the webbing reaches the value specified in S4.2(c), the increase in separation
of the points of the extensometer shall be measured and the percent elongation
shall be calculated to the nearest 0.5 percent. Each value shall be not
more than the appropriate elongation requirement in S4.2(c).
(d) Resistance to abrasion. The webbing from three seat belt assemblies
shall be tested for resistance to abrasion by rubbing over the hexagon
bar prescribed in Figure 2 in the following manner: The webbing shall
be mounted in the apparatus shown schematically in Figure 2. One end of
the webbing (A) shall be attached to a weight mass (B) that
has a mass of 2.35 ± 0.05 kg, except that a weight that
has a mass of 1.5 ± 0.05 kg shall be used for webbing in pelvic
and upper torso restraints of a belt assembly used in a child restraint
system. The webbing shall be passed over the two new abrading edges of
the hexagon bar (C) and the other end attached to an oscillating drum
(D) which has a stroke of 330 mm. Suitable guides shall be used to prevent
movement of the webbing along the axis of hexagonal bar C. Drum D shall
be oscillated for 5,000 strokes or 2,500 cycles at a rate of 60 ±
2 strokes per minute or 30 ± 1 cycles per minute. The abraded webbing
shall be conditioned as prescribed in paragraph (a) of this section and
tested for breaking strength by the procedure described in paragraph (b)
of this section. The median values for the breaking strengths determined
on abraded and unabraded specimens shall be used to calculate the percentage
of breaking strength retained.
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(e) Resistance to light. Webbing at least 508 mm in length
from three seat belt assemblies shall be suspended vertically on the inside
of the specimen rack in a Type E carbon-arc light exposure apparatus
described in Standard Practice for Operating Generating
Light-Exposure Apparatus (Carbon-Arc Type) With and Without Water for
Exposure of Nonmetallic Materials, ASTM Designation: G 23-81,
published by the American Society for Testing and Materials,16
except that the filter used for 100 percent polyester yarns shall
be chemically strengthened soda-lime glass with a transmittance of less
than 5 percent for wave lengths equal to or less than 305 nanometers
and 90 percent or greater transmittance for wave lengths of 375 to
800 nanometers. The apparatus shall be operated without water spray
at an air temperature of 60 ± 2ºC measured at a point 25 ± 5 mm
outside the specimen rack and midway in height. The temperature sensing
element shall be shielded from radiation. The specimens shall be exposed
to light from the carbon-arc for 100 hours and then conditioned as
prescribed in paragraph (a) of this section. The colorfastness of
the exposed and conditioned specimens shall be determined on the Geometric
Gray Scale for Color Change issued by the American Association
of Textile Chemists and Colorists. The breaking strength of the specimens
shall be determined by the procedure prescribed in paragraph (b) of this
section. The median values for the breaking strengths determined on exposed
and unexposed specimens shall be used to calculate the percentage of breaking
strength retained.
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(f) Resistance to micro-organisms. Webbing at least 508 mm in
length from three seat belt assemblies shall first be preconditioned in
accordance with Appendix A1 and A2 of American Association of Textile
Chemists and Colorists Test Method 30-1981, Fungicides Evaluation
on Textiles: Mildew and Rot Resistance of Textiles, and then subjected
to Test I, “Soil Burial” of that test method.17
After soil-burial for a period of 2 weeks, the specimen shall be washed
in water, dried, and conditioned as prescribed in paragraph (a) of this
section. The breaking strengths of the specimens shall be determined by
the procedure prescribed in paragraph (b) of this section. The median
values for the breaking strengths determined on exposed and unexposed
specimens shall be used to calculate the percentage of breaking strength
retained.
Note: This test shall not be required on webbing made from material which
is inherently resistant to micro-organisms.
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(a) Corrosion resistance. Three seat belt assemblies shall be
tested in accordance with American Society for Testing and Materials B
117-73, Standard Method of Salt Spray (Fog) Testing.18
Any surface coating or material not intended for permanent retention on
the metal parts during service life shall be removed prior to preparation
of the test specimens for testing. The period of the test shall be 50
hours for all attachment hardware at or near the floor, consisting of
two periods of 24 hours of exposure to salt spray followed by 1 hour of
drying, and 25 hours for all other hardware, consisting of one period
of 24 hours of exposure to salt spray followed by 1 hour of drying. In
the salt spray test chamber, the parts from the three assemblies shall
be oriented differently, selecting those orientations most likely to develop
corrosion on the larger areas. At the end of test, the seat belt assembly
shall be washed thoroughly with water to remove the salt. After drying
for at least 24 hours under the standard laboratory conditions specified
in S5.1(a), attachment hardware shall be examined for ferrous corrosion
on significant surfaces, that is, all surfaces that can be contacted by
a sphere 19 mm in diameter, and other hardware shall be examined for ferrous
and nonferrous corrosion which may be transferred, either directly or
by means of the webbing, to a person or his clothing during use of a seat
belt assembly incorporating the hardware.
Note: When attachment and other hardware are permanently fastened, by
sewing or other means, to the same piece of webbing, separate assemblies
shall be used to test the two types of hardware. The test for corrosion
resistance shall not be required for attachment hardware made from corrosion-resistant
steel containing at least 11.5 percent chromium or for attachment hardware
protected with an electrodeposited coating of nickel, or copper and nickel,
as prescribed in S4.3(a). The assembly that has been used to test the
corrosion resistance of the buckle shall be used to measure adjustment
force, tilt-lock adjustment, and buckle latch in paragraphs (e), (f),
and (g), respectively, of this section, assembly performance in S5.3,
and buckle release force in paragraph (d) of this section.
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(b) Temperature resistance. Three seat belt assemblies having
plastic or nonmetallic hardware or having retractors shall be subjected
to the conditions prescribed in Procedure D of American Society for Testing
and Materials D 756-78, Standard Practice for Determination of Weight
and Shape Changes of Plastics Under Accelerated Service Conditions.19
The dimension and weight measurement shall be omitted. Buckles shall be
unlatched and retractors shall be fully retracted during conditioning.
The hardware parts, after conditioning, shall be used for all applicable
tests in S4.3 and S4.4.
(c) Attachment hardware
(1) Attachment bolts used to secure the pelvic restraint of a seat belt
assembly to a motor vehicle shall be tested in a manner similar to that
shown in Figure 3. The load shall be applied at an angle of 45 degrees
to the axis of the bolt through attachment hardware from the seat belt
assembly, or through a special fixture which simulates the loading applied
by the attachment hardware. The attachment hardware or simulated fixture
shall be fastened by the bolt to the anchorage shown in Figure 3, which
has a standard 7/16-20 UNF-2B or ½-13 UNC-2B or metric
equivalent threaded hole in a hardened steel plate at least 10 mm in thickness.
The bolt shall be installed with two full threads exposed from the fully
seated position. The appropriate force required by S4.3(c) shall be applied.
A bolt from each of three seat belt assemblies shall be tested.
(2) Attachment hardware, other than bolts, designed to receive the ends
of two seat belt assemblies shall be subjected to a tensile force of 26,689
N in a manner simulating use. The hardware shall be examined for fracture
after the force is released. Attachment hardware from three seat belt
assemblies shall be tested.
(3) Single attachment hooks for connecting webbing to any eye bolt shall
be tested in the following manner: The hook shall be held rigidly so that
the retainer latch or keeper, with cotter pin or other locking device
in place, is in a horizontal position as shown in Figure 4. A force of
667 ± 9 N shall be applied vertically as near as possible to the
free end of the retainer latch, and the movement of the latch by this
force at the point of application shall be measured. The vertical force
shall be released, and a force of 667 ± 9 N shall be applied horizontally
as near as possible to the free end of the retainer latch. The movement
of the latch by this force at the point of load application shall be measured.
Alternatively, the hook may be held in other positions, provided the forces
are applied and the movements of the latch are measured at the points
indicated in Figure 4. A single attachment hook from each of three seat
belt assemblies shall be tested.
(d) Buckle release
(1) Three seat belt assemblies shall be tested to determine compliance
with the maximum buckle release force requirements, following the assembly
test in S5.3. After subjection to the force applicable for the assembly
being tested, the force shall be reduced and maintained at 667 N on the
assembly loop of a Type 1 seat belt assembly, 334 N on the components
of a Type 2 seat belt assembly. The buckle release force shall be measured
by applying a force on the buckle in a manner and direction typical of
those which would be employed by a seat belt occupant. For push-button-release
buckles, the force shall be applied on the centerline at least
3 mm from the edge of the push-button access opening of the buckle
in a direction that produces maximum releasing effect. For lever-release
buckles, the force shall be applied at least 3 mm from the edge
on the centerline of the buckle lever or finger tab in a direction
that produces maximum releasing effect.
(2) The area for application of release force on a push-button-actuated
buckle shall be measured to the nearest 30 mm2. The cylinder
specified in S4.3(d) shall be inserted in the actuation portion of a lever-released
buckle for determination of compliance with the requirement. A buckle
with other release actuation shall be examined for access of release by
fingers.
(3) The buckle of a Type 1 or Type 2 seat belt assembly shall
be subjected to a compressive force of 1,779 N applied anywhere on
a test line that is coincident with the centerline of the belt extended
through the buckle or on any line that extends over the center of the
release mechanism and intersects the extended centerline of the belt at
an angle of 60 degrees. The load shall be applied by using a curved cylindrical
bar having a cross section diameter of 19 mm and a radius of curvature
of 152 mm, placed with its longitudinal centerline along the test
line and its center directly above the point or the buckle to which the
load will be applied. The buckle shall be latched, and a tensile force
of 334 N shall be applied to the connected webbing during the application
of the compressive force. Buckles from three seat belt assemblies shall
be tested to determine compliance with paragraph S4.3(d)(3).
(e) Adjustment Force. Three seat belt assemblies shall be tested
for adjustment force on the webbing at the buckle or other manual adjusting
device normally used to adjust the size of the assembly. With no load
on the anchor end, the webbing shall be drawn through the adjusting device
at a rate of 508 ± 50 mm per minute and the maximum force shall
be measured to the nearest 1 N after the first 25 mm of webbing
movement. The webbing shall be precycled 10 times prior to measurement.
(f) Tilt-lock adjustment. This test shall be made on buckles or
other manual adjusting devices having a tilt-lock adjustment normally
used to adjust the size of the assembly. Three buckles or devices shall
be tested. The base of the adjustment mechanism and the anchor end of
the webbing shall be oriented in planes normal to each other. The webbing
shall be drawn through the adjustment mechanism in a direction to increase
belt length at a rate of 508 ± 50 mm per minute while the plane
of the base is slowly rotated in a direction to lock the webbing. Rotation
shall be stopped when the webbing locks, but the pull on the webbing shall
be continued until there is a resistance of at least 89 N. The locking
angle between the anchor end of the webbing and the base of the adjustment
mechanism shall be measured to the nearest degree. The webbing shall be
precycled 10 times prior to measurement.
(g) Buckle latch. The buckles from three seat belt assemblies
shall be opened fully and closed at least 10 times. Then the buckles shall
be clamped or firmly held against a flat surface so as to permit normal
movement of the buckle parts, but with the metal mating plate (metal-to-metal
buckles) or webbing end (metal-to-webbing buckles) withdrawn from the
buckle. The release mechanism shall be moved 200 times through the maximum
possible travel against its stop with a force of 133 ± 13 N at
a rate not to exceed 30 cycles per minute. The buckle shall be examined
to determine compliance with the performance requirements of S4.3(g).
A metal-to-metal buckle shall be examined to determine whether partial
engagement is possible by means of any technique representative of actual
use. If partial engagement is possible, the maximum force of separation
when in such partial engagement shall be determined.
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(h) Nonlocking retractor. [CONTENT DELETED]20
(i) Automatic-locking retractor. Three retractors shall be tested
in a manner to permit the retraction force to be determined exclusive
of the gravitational forces on the hardware or webbing being retracted.
The webbing shall be fully extended from the retractor. While the webbing
is being retracted, the average force of retraction within plus or minus
51 mm of 75 percent extension (25 percent retraction) shall be determined
and the webbing movement between adjacent locking segments shall be measured
in the same region of extension. A seat belt assembly with an automatic-locking
retractor in an upper torso restraint shall be tested in a vehicle in
a manner prescribed by the installation and usage instructions. The retraction
force on the occupant of the seat belt assembly shall be determined before
and after traveling for 10 minutes at a speed of 24 kilometers per hour
or more over a rough road (e.g., Belgian block road) where the occupant
is subjected to displacement with respect to the vehicle in both horizontal
and vertical directions. Measurements shall be made with the vehicle stopped
and the occupant in the normal seated position.
(j) Emergency-locking retractor
(1) For seat belt assemblies manufactured before February 22, 2007. Except
for manufacturers that elect to comply with S4.3(j)(2) and the corresponding
test procedures of S5.2(j)(2), a retractor shall be tested in a manner
that permits the retraction force to be determined exclusive of the gravitational
forces on the hardware or webbing being retracted. The webbing shall be
fully extended from the retractor, passing over or through any hardware
or other material specified in the installation instructions. While the
webbing is being retracted, the lowest force of retraction within ±
51 mm of 75 percent extension shall be determined. A retractor that is
sensitive to webbing withdrawal shall be subjected to an acceleration
of 3 m/s2 (0.3 g) within a period of 50 milliseconds (ms),
while the webbing is at 75 percent extension, to determine compliance
with S4.3(j)(1)(ii). The retractor shall be subjected to an acceleration
of 7 m/s2 (0.7 g) within a period of 50 ms, while the webbing
is at 75 percent extension, and the webbing movement before locking shall
be measured under the following conditions: For a retractor sensitive
to webbing withdrawal, the retractor shall be accelerated in the direction
of webbing retraction while the retractor drum’s central axis is
oriented horizontally and at angles of 45, 90, 135, and 180 degrees to
the horizontal plane. For a retractor sensitive to vehicle acceleration,
the retractor shall be:
(i) Accelerated in the horizontal plane in two directions normal to each
other, while the retractor drum’s central axis is oriented at the
angle at which it is installed in the vehicle; and
(ii) Accelerated in three directions normal to each other, while the
retractor drum’s central axis is oriented at angles of 45, 90, 135,
and 180 degrees from the angle at which it is installed in the vehicle,
unless the retractor locks by gravitational force when tilted in any direction
to any angle greater than 45 degrees from the angle at which it is installed
in the vehicle.
(2) For seat belt assemblies manufactured on or after February 22, 2007,
and for manufacturers opting for early compliance. A retractor shall be
tested in a manner that permits the retraction force to be determined
exclusive of the gravitational forces on the hardware or webbing being
retracted.
(i) Retraction force: The webbing shall be extended fully from the retractor,
passing over and through any hardware or other material specified in the
installation instructions. While the webbing is being retracted, measure
the lowest force of retraction within ± 51 mm of 75 percent extension.
(ii) Gravitational locking: For a retractor sensitive to vehicle acceleration,
rotate the retractor in any direction to an angle greater than 45 degrees
from the angle at which it is installed in the vehicle. Apply a force
to the webbing greater than the minimum force measured in S5.2(j)(2)(i)
to determine compliance with S4.3(j)(2)(i)(D).
(iii) Dynamic tests: Each acceleration pulse shall be recorded using
an accelerometer having a full-scale range of ± 10 g and processed
according to the practices set forth in SAE Recommended Practice J211-1
rev. December 2003, Instrumentation for Impact Test—Part 1—Electronic
Instrumentation, Channel Frequency Class 60. The webbing shall be
positioned at 75 percent extension, and the displacement shall be measured
using a displacement transducer. For tests specified in S5.2(j)(2)(iii)(A)
and (B), the 0.7 g acceleration pulse shall be within the acceleration-time
corridor shown in Figure 8 of this TSD standard.
(A) For a retractor sensitive to vehicle acceleration,
(1) The retractor drum’s central axis shall be oriented
at the angle at which it is installed in the vehicle ± 0.5 degree.
Accelerate the retractor in the horizontal plane in two directions normal
to each other and measure the webbing payout; and
(2) If the retractor does not meet the 45-degree tilt-lock
requirement of S4.3(j)(2)(i)(D), accelerate the retractor in three directions
normal to each other while the retractor drum’s central axis is
oriented at angles of 45, 90, 135, and 180 degrees from the angle at which
it is installed in the vehicle and measure webbing payout.
(B) For a retractor sensitive to webbing withdrawal,
(1) The retractor drum’s central axis shall be oriented
horizontally ± 0.5 degree. Accelerate the retractor in the direction
of webbing retraction and measure webbing payout; and
(2) The retractor drum’s central axis shall be oriented
at angles of 45, 90, 135, and 180 degrees to the horizontal plane. Accelerate
the retractor in the direction of the webbing retraction and measure the
webbing payout.
(C) A retractor that is sensitive to webbing withdrawal shall be subjected
to an acceleration no greater than 0.3 g occurring within a period of
the first 50 ms and sustaining an acceleration no greater than 0.3 g throughout
the test, while the webbing is at 75 percent extension. Measure the webbing
payout.
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(k) Performance of retractor. After completion of the corrosion-resistance
test described in paragraph (a) of this section, the webbing shall be
fully extended and allowed to dry for at least 24 hours under the standard
laboratory conditions specified in S5.1(a). The retractor shall be examined
for ferrous and nonferrous corrosion which may be transferred, either
directly or by means of the webbing, to a person or his clothing during
use of a seat belt assembly incorporating the retractor, and for ferrous
corrosion on significant surfaces if the retractor is part of the attachment
hardware. The webbing shall be withdrawn manually and allowed to retract
for 25 cycles. The retractor shall be mounted in an apparatus capable
of extending the webbing fully, applying a force of 89 N at full extension,
and allowing the webbing to retract freely and completely. The webbing
shall be withdrawn from the retractor and allowed to retract repeatedly
in this apparatus until 2,500 cycles are completed. The retractor and
webbing shall then be subjected to the temperature resistance test prescribed
in paragraph (b) of this section. The retractor shall be subjected to
2,500 additional cycles of webbing withdrawal and retraction.
Then, the retractor and webbing shall be subjected to dust in a chamber
similar to the one illustrated in Figure 6 8 containing
about 0.9 kg of coarse grade dust conforming to the specification given
in Society of Automotive Engineers Recommended Practice J726, Air
Cleaner Test Code, Sept. 1979. The dust shall be agitated every 20
minutes for 5 seconds by compressed air, free of oil and moisture, at
a gage pressure of 550 ± 55 kPa entering through an orifice 1.5
± 0.1 mm in diameter. The webbing shall be extended to the top
of the chamber and kept extended at all times, except that the webbing
shall be subjected to 10 cycles of complete retraction and extension within
1 to 2 minutes after each agitation of the dust. At the end of 5 hours,
the assembly shall be removed from the chamber. The webbing shall be fully
withdrawn from the retractor manually and allowed to retract completely
for 25 cycles. An automatic-locking retractor or a nonlocking retractor21
attached to a pelvic restraint shall be subjected to 5,000 additional
cycles of webbing withdrawal and retraction. An emergency-locking retractor
or a nonlocking retractor attached to an upper torso restraint
shall be subjected to 45,000 additional cycles of webbing withdrawal and
retraction between 50 and 100 percent extension. The locking mechanism
of an emergency-locking retractor shall be actuated at least 10,000 times
within 50 to 100 percent extension of webbing during the 50,000 cycles.
At the end of the test, compliance of the retractors with applicable requirements
in S4.3(h), (i), and (j) shall be determined. Three retractors
shall be tested for performance.
(a) Type 1 seat belt assembly. Three complete seat belt assemblies,
including webbing, straps, buckles, adjustment and attachment hardware,
and retractors, arranged in the form of a loop as shown in Figure 5, shall
be tested in the following manner:
(1) The testing machine shall conform to the requirements specified in
S5.1(b). A double-roller block shall be attached to one head of the testing
machine. This block shall consist of two rollers 102 mm in diameter and
sufficiently long so that no part of the seat belt assembly touches parts
of the block other than the rollers during test. The rollers shall be
mounted on antifriction bearings and spaced 305 mm between centers, and
shall have sufficient capacity so that there is no brinelling, bending,
or other distortion of parts which may affect the results. An anchorage
bar shall be fastened to the other head of the testing machine.
(2) The attachment hardware furnished with the seat belt assembly shall
be attached to the anchorage bar. The anchor points shall be spaced so
that the webbing is parallel in the two sides of the loop. The attaching
bolts shall be parallel to, or at an angle of 45 or 90 degrees to, the
webbing, whichever results in an angle nearest to 90 degrees between the
webbing and the attachment hardware, except that eye bolts shall be vertical,
and the attaching bolts or nonthreaded anchorages of a seat belt assembly
designed for use in specific models of motor vehicles shall be installed
to produce the maximum angle in use indicated by the installation instructions,
utilizing special fixtures if necessary to simulate installation in the
motor vehicle. Rigid adapters between the anchorage bar and attachment
hardware shall be used if necessary to locate and orient the adjustment
hardware. The adapters shall have a flat support face perpendicular to
the threaded hole for the attaching bolt and adequate in area to provide
full support for the base of the attachment hardware connected to the
webbing. If necessary, a washer shall be used under a swivel plate or
other attachment hardware to prevent the webbing from being damaged as
the attaching bolt is tightened.
(3) The length of the assembly loop from attaching bolt to attaching
bolt shall be adjusted to about 1,295 mm, or as near thereto as possible.
A force of 245 N shall be applied to the loop to remove any slack in the
webbing at the hardware. The force shall be removed and the heads of the
testing machine shall be adjusted for an assembly loop between 1,220 and
1,270 mm in length. The length of the assembly loop shall then be adjusted
by applying a force between 89 and 98 N to the free end of the webbing
at the buckle, or by the retraction force of an automatic-locking or emergency-locking
retractor. A seat belt assembly that cannot be adjusted to this length
shall be adjusted as closely as possible. An automatic-locking or emergency-locking
retractor, when included in a seat belt assembly, shall be locked at the
start of the test with a tension on the webbing slightly in excess of
the retractive force in order to keep the retractor locked. The buckle
shall be in a location so that it does not touch the rollers during the
test, but to facilitate making the buckle release test in S5.2(d), the
buckle should be between the rollers or near a roller in one leg.
(4) The heads of the testing machine shall be separated at a rate between
51 and 102 mm per minute until a force of 22,241 ± 222 N is applied
to the assembly loop. The extension of the loop shall be determined from
measurements of head separation before and after the force is applied.
The force shall be decreased to 667 ± 45 N and the buckle release
force measured as prescribed in S5.2(d).
(5) After the buckle is released, the webbing shall be examined for cutting
by the hardware. If the yarns are partially or completely severed in a
line for a distance of 10 percent or more of the webbing width, the cut
webbing shall be tested for breaking strength as specified in S5.1(b),
locating the cut in the free length between grips. If there is insufficient
webbing on either side of the cut to make such a test for breaking strength,
another seat belt assembly shall be used with the webbing repositioned
in the hardware. A tensile force of 11,120 ± 111 N shall be applied
to the components or a force of 22,241 ± 222 N shall be applied
to the assembly loop. After the force is removed, the breaking strength
of the cut webbing shall be determined as prescribed above.
(6) If a Type 1 seat belt assembly includes an automatic-locking retractor
or an emergency-locking retractor, the webbing and retractor shall be
subjected to a tensile force of 11,120 ± 111 N with the webbing
fully extended from the retractor.
(7) If a seat belt assembly has a buckle in which the tongue is capable
of inverted insertion, one of the three assemblies shall be tested with
the tongue inverted.
(b) Type 2 seat belt assembly. Components of three seat belt
assemblies shall be tested in the following manner:
(1) The pelvic restraint between anchorages shall be adjusted to a length
between 1,220 and 1,270 mm, or as near this length as possible if the
design of the pelvic restraint does not permit its adjustment to this
length. An automatic-locking or emergency-locking retractor, when included
in a seat belt assembly, shall be locked at the start of the test with
a tension on the webbing slightly in excess of the retractive force in
order to keep the retractor locked. The attachment hardware shall be oriented
to the webbing as specified in paragraph (a)(2) of this section and illustrated
in Figure 5. A tensile force of 11,120 ± 111 N shall be applied
on the components in any convenient manner and the extension between anchorages
under this force shall be measured. The force shall be reduced to 334
± 22 N and the buckle release force measured as prescribed in S5.2(d).
(2) The components of the upper torso restraint shall be subjected to
a tensile force of 6,672 ± 67 N following the procedure prescribed
above for testing the pelvic restraint, and the extension between anchorages
under this force shall be measured. If the testing apparatus permits,
the pelvic and upper torso restraints may be tested simultaneously. The
force shall be reduced to 334 ± 22 N and the buckle release force
measured as prescribed in S5.2(d).
(3) Any component of the seat belt assembly common to both the pelvic
and upper torso restraint shall be subjected to a tensile force of 13,344
± 134 N.
(4) After the buckle is released in the tests of the pelvic and upper
torso restraints, the webbing shall be examined for cutting by the hardware.
If the yarns are partially or completely severed in a line for a distance
of 10 percent or more of the webbing width, the cut webbing shall be tested
for breaking strength as specified in S5.1(b), locating the cut in the
free length between grips. If there is insufficient webbing on either
side of the cut to make such a test for breaking strength, another seat
belt assembly shall be used with the webbing repositioned in the hardware.
The force applied shall be 11,120 ± 111 N for the components of
a pelvic restraint and 6,672 ± 67 N for the components of an upper
torso restraint. After the force is removed, the breaking strength of
the cut webbing shall be determined as prescribed above.
(5) If a Type 2 seat belt assembly includes an automatic-locking retractor
or an emergency-locking retractor, the webbing and retractor shall be
subjected to a tensile force of 11,120 ± 111 N with the webbing
fully extended from the retractor, or to a tensile force of 6,672 ±
67 N with the webbing fully extended from the retractor if the design
of the assembly permits only upper torso restraint forces on the retractor.
(6) If a seat belt assembly has a buckle in which the tongue is capable
of inverted insertion, one of the three assemblies shall be tested with
the tongue inverted.
(c) Resistance to buckle abrasion. Seat belt assemblies shall
be tested for resistance to abrasion by each buckle or manual adjusting
device normally used to adjust the size of the assembly. The webbing of
the assembly to be used in this test shall be exposed for 4 hours to an
atmosphere having a relative humidity of 65 percent and a temperature
of 18ºC. The webbing shall be pulled back and forth through the buckle
or manual adjusting device as shown schematically in Figure 7. The anchor
end (A) of the webbing shall be attached to a weight mass
(B) that has a mass of 1.4 kg. The webbing shall pass through the
buckle (C), and the other end (D) shall be attached to a reciprocating
device so that the webbing forms an angle of 8 degrees with the hinge
stop (E). The reciprocating device shall be operated for 2,500 cycles
at a rate of 18 cycles per minute with a stroke length of 203 mm. The
abraded webbing shall be tested for breaking strength by the procedure
described in paragraph S5.1(b).
Unless a range of angles is specified or a tolerance is otherwise explicitly
provided, all angles and orientations of seat belt assemblies and components
specified in this TSD standard shall have a tolerance of
± 3 degrees.
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Figure 1 — Split Drum Grips to be Used
for the Webbing Strength Tests
Figure 2 — Hexagonal Bar to be Used
for the Abrasion Test
Figure 3 — Testing of Attachment Bolts
Figure 4 — Testing of Single Attachment
Hooks
Figure 5 — Testing of the Seat Belt
Assembly
Figure 6 — Dust Chamber for Retractor
Cycling
Figure 7 — Testing of Buckle Resistance
to Abrasion
|
Reference Point |
Time (ms) |
Acceleration (g) |
A |
0 |
0.05 |
B |
2 |
0.8 |
C |
50 |
0.8 |
D |
50 |
0.72 |
E |
10 |
0 |
F |
40 |
0.65 |
Figure 8 — Acceleration Corridors
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ENDNOTES:
1 Please see subsection 2(1)
of the Motor Vehicle Safety Regulations (MVSR) for the applicable
definition.
2 Please see subsection
209(2) of the MVSR for an additional requirement.
3 Please see subsection
209(8) of the MVSR for a related provision.
4 Please see subsection
209(9) of the MVSR for a related provision and subsections 208(13) to (15) for
seat belt fit requirements.
5 Please see subsection
209(10) of the MVSR for an additional requirement.
6 Please see subsection 209(11) of the MVSR
for a related provision.
7 Please see subsection
209(9) of the MVSR for a related provision.
8 Please see subsections
209(3) and (5) of the MVSR for additional requirements.
9 Please see subsection
209(7) of the MVSR for an alternative requirement.
10 Please see subsection
209(11) of the MVSR for a related provision.
11 Please see subsection
209(12) of the MVSR for an additional requirement.
12 Please see subsection
209(9) of the MVSR for a related provision.
13 Please see subsection
209(9) of the MVSR for a related provision.
14 Please see subsections
209(4) and (6) of the MVSR for additional requirements.
15 Please see subsection
209(7) of the MVSR for an alternative requirement.
16 Please see subsection
209(7) of the MVSR for an alternative requirement.
17 Please see subsection
209(7) of the MVSR for an alternative requirement.
18 Please see subsection
209(7) of the MVSR for an alternative requirement.
19 Please see subsection
209(7) of the MVSR for an alternative requirement.
20 Please see subsection
209(11) of the MVSR for a related provision.
21 Please see subsection
209(11) of the MVSR for a related provision.
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