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MOTOR VEHICLE SAFETY ACT
Motor Vehicle Safety Regulations
Standard 202
Head Restraints
202. (1) In this section, "H-point machine" and "H-point template"
have the same meaning as in SAE Recommended Practice J826, "Devices for Use in
Defining and Measuring Vehicle Seating Accommodation" (June 1991).
(2) A head restraint shall be provided at each front outboard designated
seating position in a multipurpose passenger vehicle, bus or truck with a GVWR
of 4 536 kg or less, a three-wheeled vehicle and a passenger car that
(a) when tested during a forward acceleration of not less than 8 g on the seat
supporting structure, limits rearward angular displacement of the head reference line to
45 from the torso reference line; or
(b) when adjusted to its fully extended design position,
(i) has an overall height of not less than 700 mm when measured perpendicularly to a
line that passes through the seating reference point and is perpendicular to the torso
line,
(ii) has a lateral width of not less than 250 mm in the case of a bench-type seat or
170 mm in the case of an individual seat, when measured either 63 mm below the top of the
head restraint or 635 mm above the seating reference point,
(iii) does not allow the rearmost portion of the head form to be displaced more than
102 mm perpendicularly rearward of the extended displaced torso reference line during the
application of the test load, and
(iv) withstands an increasing load until either failure of the seat or seat back occurs
or the load so increased is equal to 890 N.
(3) The test referred to in paragraph (2)(a) shall be carried out as follows:
(a) the head restraint shall be in its fully extended design position;
(b) reference lines shall be established on the exterior profile of the head and torso
of a dummy or an approved equivalent test device by
(i) positioning the dummy's back on a horizontal flat surface with the lumbar joints in
a straight line,
(ii) rotating the head of the dummy rearward until the back of the head contacts the
surface referred to in subparagraph (i),
(iii) positioning the back of an H-point template against the surface referred to in
subparagraph (i) and alongside the dummy in such a manner that the H-point of the template
is aligned with the H-point of the dummy,
(iv) establishing the torso line of the H-point template as the line parallel to the
small of the back of the template and extending through the H-point,
(v) establishing the dummy torso reference line by superimposing the torso line of the
H-point template on the torso of the dummy, and
(vi) establishing the head reference line by extending the dummy torso reference line
to the head;
(c) the dummy referred to in paragraph (b) shall have the weight and seated height of a
95th percentile adult male and an approved representation of a human articulated neck
structure;
(d) at each designated seating position having a head restraint, the dummy shall be
placed in the manufacturer's recommended design seated position and snugly restrained by a
Type 1 or Type 2 seat belt assembly referred to in section 209;
(e) a forward acceleration shall be applied to the structure supporting the seat in
such a manner that, when graphically depicted, the magnitude of the acceleration curve
shall not be less than that of a half-sine wave having an amplitude of 8 g and a duration
of 80 milliseconds and not more than that of a half-sine wave having an amplitude of 9.6 g
and a duration of 96 milliseconds; and
(f) the maximum rearward angular displacement of the head reference line from the dummy
torso reference line shall be measured.
(4) The test referred to in paragraph (2)(b) shall be carried out as follows:
(a) an H-point machine with the centreline of the head-room probe in the full back
position shall be placed at the manufacturer's recommended design seated position;
(b) the displaced torso reference line shall be established by applying a rearward
moment of 373 N·m about the seating reference point to the seat back through the back pan
of the test device so placed;
(c) the back pan shall be removed and, using a 165 mm diameter spherical head form or a
cylindrical head form having a 165 mm diameter in plan view and a 153 mm height in profile
view, a rearward initial load shall be applied perpendicular to the displaced torso
reference line and 65 mm below the top of the head restraint sufficient to produce a 373
N·m moment about the seating reference point; and
(d) the initial load shall be gradually increased to 890 N or until the seat or seat
back fails, whichever occurs first.
Established by the CONSOLIDATED REGULATIONS OF
CANADA, 1978.
amended by
SOR/95-60 11 January, 1995 pursuant to sections 4 and 7 of the Motor Vehicle Safety Act
Revoked and replaced.
SOR/2003-272 24 July, 2003 pursuant to section 5 and
subsection 11(1) of the Motor Vehicle Safety Act, comes into force 24
July, 2003.
The portion of subsection 202(2) of Schedule IV before paragraph (a) is
replaced;
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