U.S. patent number RE29,841 [Application Number 05/739,148] was granted by the patent office on 1978-11-21 for safety vehicle seat structure.
This patent grant is currently assigned to Dorel Co. Ltd.. Invention is credited to Hyman Wener.
United States Patent |
RE29,841 |
Wener |
November 21, 1978 |
Safety vehicle seat structure
Abstract
A safety vehicle seat structure comprising a seat having a
backrest and a seat portion. A support frame is secured to the seat
and comprises a pair of spaced-apart vertical back support members
each pivotally secured at their upper ends to a respective side of
the backrest. Each vertical back support member has a lower end
secured to a respective one of two horizontal supports located
below the seat portion. At least one connecting member is secured
to the seat portion forwardly of the back support members and
extends therebelow to pivotally interconnect with a displaceable
lever framework whereby actuation of the lever framework will cause
displacement of the seat between two positions relative to the
support frame. A belt attachment clamp is secured to the horizontal
support members and adapted to receive and rigidly engage a portion
of a retaining belt extending therethrough. A safety strap
structure is also provided for immovably securing the seat and
support frame to a rigid external structure and further provides
shock absorbing means for damping the forward movement of a
person's body when subjected to a shock.
Inventors: |
Wener; Hyman (Laval,
CA) |
Assignee: |
Dorel Co. Ltd. (Montreal North,
CA)
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Family
ID: |
23971057 |
Appl.
No.: |
05/739,148 |
Filed: |
November 5, 1976 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
Reissue of: |
496054 |
Aug 9, 1974 |
03922035 |
Nov 25, 1975 |
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Current U.S.
Class: |
297/256.13;
297/253; 297/329 |
Current CPC
Class: |
A47D
1/103 (20130101); B60N 2/2821 (20130101); B60N
2/286 (20130101) |
Current International
Class: |
A47D
1/00 (20060101); A47D 1/10 (20060101); B60N
2/26 (20060101); B60N 2/28 (20060101); A47D
001/10 () |
Field of
Search: |
;297/250,253,329 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Zugel; Francis K.
Claims
I claim:
1. A safety vehicle seat structure comprising a seat having a
backrest and a seat portion, a support frame secured to said seat,
said support frame comprising a pair of spaced apart vertical back
support members each pivotally secured at their upper ends .Iadd.to
an end of a respective pivoting link, the other end of said
pivoting link being pivotally secured .Iaddend.to a respective side
of said backrest, each said vertical back support members having a
lower end secured to a respective one of two horizontal support
members located below said seat portion, at least one connecting
member secured to said seat portion forwardly of said back support
members and extending therebelow to pivotally interconnect with a
displaceable lever framework whereby actuation of said lever
framework will cause displacement of said seat between two
positions relative to said support frame, said displaceable lever
framework including a frame having opposed parallel arms and an
interconnecting arm connected between said opposed arms, each said
opposed parallel arms being pivotally interconnected near said
interconnecting arm to a respective one of said two horizontal
support members below said seat portion, one of said opposed arms
being pivotally interconnected at its free end with said at least
one connecting member, one of said opposed arms being lockable with
one of said horizontal support members.
2. A safety vehicle seat as claimed in claim 1 wherein one of said
opposed arms is provided with a lever arm for actuation of said
displaceable framework.
3. A safety vehicle seat as claimed in claim 2 wherein said lever
arm is releasably locked with one of said horizontal support
members whereby to rigidly secure said support frame in two
different configurations to support said seat in two different
positions.
4. A safety vehicle seat structure as claimed in claim 1 wherein a
belt attachment clamp is secured to said support frame below said
seat portion and adapted to receive and rigidly engage a portion of
a retaining belt extending therethrough and secured to a vehicle
frame.
5. A safety vehicle seat structure as claimed in claim 4 wherein
said belt attachment clamp comprises a base channel member having
two parallel side walls, a hook member at one end of said base
channel and having a hook end, a wedge element pivotally secured at
one end to the other end of said base channel member between sid
two parallel side walls, the other end of said wedge element being
pivotally connected to a clamp lever plate having an attaching loop
adapted to engage with said hook end and rigidly secure said wedge
element in said base channel with said lever plate thereover
whereby to rigidly secure a portion of a belt positioned acros said
two parallel side walls of said base channel and under said wedge
element.
6. A safety vehicle seat structure as claimed in claim 1 further
comprising a safety strap structure for immovably securing said
seat and support frame to a rigid external structure, said safety
strap structure having shock absorbing means for damping the
forward movement of a person's body when subjected to a shock.
7. A safety vehicle seat structure as claimed in claim 6 wherein
said safety strap structure comprises two shoulder straps each
having said shock absorbing means therein, said shoulder straps
being guided over a respective shoulder of a person sitting in said
seat and extending frontwardly downward of said person, said two
shoulder straps each being rigidly secured at one end to said rigid
external structure, and at its other end to a further strap
extending about said seat portion.
8. A safety vehicle seat structure as claimed in claim 7 wherein
said shock absorbing expandable means comprises a section of said
shoulder strap being folded in abutment and aligned relationship to
define two abuting strap sections, said two sections being secured
to each other by a plurality of spaced apart transverse rows of
stitches whereby a predetermined force applied along the
longitudinal axis of said shoulder strap will cause said rows of
stitches to break in sequential order as said section of strap
detaches itself.
9. A safety vehicle seat structure as claimed in claim 7 wherein
guide apertures are provided in an upper part of said backrest for
receiving a respective shoulder strap therethrough, said expandable
means being located behind said backrest between a shoulder strap
upper end and an associated guide aperture, each said shoulder
strap upper end being attached to a strap connector, an adjustable
seat attachment strap secured between said strap connector and said
backrest, and an adjustable securing strap having a connector at
one end secured to said rigid external structure, the outer end of
said securing strap being adjustably connected to said strap
connector.
10. A safety vehicle seat structure as claimed in claim 9 wherein
said securing strap is connected to said strap connector by a hook
plate member having a hook plate with a flat wall portion and a
hook flange at one end thereof securable to said strap connector,
an aperture through said flat wall portion, a cover plate retained
in juxtaposition with said flat wall portion, a strap receiving
slot in said cover plate in registry with said aperture in said
flat wall, means for retaining said cover plate over said flat wall
portion of said hook plate, said securing strap having a portion
thereof secured to said strap connector by passing said strap below
said flat wall portion of said hook plate through said aperture and
over a leading edge of said cover plate and through said slot and
aperture whereby said strap is in juxtaposition beneath said hook
plate and extends rearwardly thereof from said secured
position.
11. A safety vehicle seat structure as claimed in claim 7 wherein
both said shoulder straps are each secured at a lower end thereof
above said seat portion to a respective connector plate of a
further strap connector, a further adjustable belt extending
transversely through vertical side walls of said seat and spaced
above said seat, said further adjustable strap being secured to
both said connector plates to form a loop passing above and below
said seat, and a further strap secured at one end to aligned slots
in juxtaposed positions of said connector plates and at another end
to said further adjustable strap under said seat portion.
12. A safety vehicle seat structure comprising a seat having a
backrest and a seat portion, a support frame secured to said seat,
said support frame comprising a pair of spaced apart vertical back
support members each pivotally secured at their upper ends to a
respective side of said backrest, each said vertical back support
members having a lower end secured to a respective one of two
horizontal support members located below said seat portion, at
least one connecting member secured to said seat portion forwardly
of said back support members and extending therebelow to pivotally
interconnect with a displaceable lever framework whereby actuation
of said lever framework will cause displacement of said seat
between two positions relative to said support frame, said upper
end of each said vertical support members being pivotally
interconnected to a respective side of said backrest through a
pivoting link pivotally secured at one end to said vertical support
member upper end and pivotally secured at its other end to a
protective side wall of said backrest, said seat side wall being
forwardly projecting and of channel cross-section defining two
spaced apart walls, said link being pivotally secured in a channel
bracket secured between said spaced apart walls to a rigid pivotal
connection in said channel bracket.
Description
BACKGROUND OF INVENTION
a. Field of the Invention
The present invention relates to a seat structure and more
particularly to a safety vehicle seat structure for children and of
the type normally utilized for attachment to an automobile
seat.
B. Description of Prior Art
Various types of automobile seats for children are known. The
majority of these seats are normally attached to the backrest of an
automobile seat or else provided with a framework which is adapted
to be wedged in the gap between the backrest and seat portion of an
automobile seat. Further, it is known to attach the framework of
such seats to the retaining safety belt which is normally provided
on the seat of an automobile for engagement across the waist or
laps of a person sitting on the automobile seat.
All of the structures heretofore known do not, however, provide a
seat which is rigidly attached to the framework of the vehicle
whilst, at the same time, providing ample security to the child
sitting in the seat.
SUMMARY OF INVENTION
It is, therefore, a feature of the present invention to provide an
improved safety vehicle seat structure which can be immovably
secured to an automobile framework whilst positioned on the
automobile seat and providing safe retention of a child sitting in
the seat.
It is a further feature of the present invention to provide a
safety automobile seat structure which is supported on a framework
which is lockable in two positions whereby to cause displacement of
the seat to assume two positions.
It is a still further feature of the present invention to provide a
safety vehicle seat structure having a belt attachment clamp
secured to the support frame and adapted to receive and rigidly
engage a retaining belt extending therethrough and secured to the
vehicle frame structure.
A still further feature of the present invention is to provide a
safety vehicle seat structure incorporating a safety strap
structure for immovably securing the seat and the support frame to
a rigid vehicle structure, the safety strap structure further
providing shock absorbing retention of a child sitting in the
seat.
According to the above features, from a broad aspect, the present
invention provides a safety vehicle seat structure comprising a
seat having a backrest and a seat portion. A support frame is
secured to the seat and comprises a pair of spaced-apart vertical
back support members each pivotally secured at their upper ends to
a respective side of the backrest. Each vertical back support
member has a lower end secured to a respective one of two
horizontal supports located below the seat portion. At least one
connecting member is secured to the seat portion forwardly of the
back support members and extends therebelow to pivotally
interconnect with a displaceable lever framework whereby actuation
of the lever framework will cause displacement of the seat between
two positions relative to the support frame.
According to a further broad aspect, the present invention provides
a safety seat structure comprising a seat having a backrest and a
seat portion. A rigid support frame is secured to the seat and
supports the seat above lower horizontal support members. A belt
attachment clamp is secured to the horizontal support members and
adapted to receive and rigidly engage a belt positioned
therethrough and secured to a vehicle frame.
From a still further broad aspect, the present invention provides a
seat structure comprising a seat having a backrest and a seat
portion. A support frame is provided for maintaining the seat
elevated from a horizontal plane. A safety strap structure is
provided for immovably securing the seat and support frame to a
rigid external structure, the safety strap structure further
providing shock absorbing retention of a child sitting in the
seat.
BRIEF DESCRIPTION OF DRAWINGS
A preferred embodiment of the present invention will now be
described with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of the safety seat structure of the
present invention;
FIG. 2 is a side view of the safety seat structure shown in FIG. 1,
but with the seat secured in a second position with the support
frame;
FIG. 3 is a fragmented perspective view of a portion of the seat
side wall showing a pivotable link attachment;
FIG. 4 is a perspective view of the belt attachment clamp;
FIG. 5 is a schematic front view of the seat illustrating the
safety strap structure;
FIG. 6 is a perspective view of a portion of the safety strap
structure; and
FIGS. 7A and 7B are plan views of the parts of the hook plate
member.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the drawings, and more particularly to FIGS. 1 to
4, there is shown, generally at 10, the safety vehicle seat
structure. The seat structure 10 comprises a seat 11 having a
backrest 12 and a seat portion 13. A support frame 14 is secured to
the seat 11 and comprises a pair of spaced-apart vertical back
support members 15 each pivotally attached at their upper ends 16
to a respective side of the backrest 12. Each of the vertical back
support members 15 have a lower end 17 secured to a respective one
of two horizontal support members 18 located below the seat portion
13. At least one connecting member 19 is secured to a protective
side wall 20 of the seat portion 13 by suitable means such as
rivets, screws or bolts 21. The connecting member 19 extends
downwardly and forwardly of the seat portion 13 to pivotally
interconnect at its lower end 22 with an actuable lever framework
23.
The actuable lever framework consists of a generally U-shaped frame
having two parallel end members 24 and an integrally formed
interconnecting transverse member 25. As shown more clearly in FIG.
2, the lower end 22 of the connecting member 19 is pivotally
secured to the free end of one of the end members 23. The end
members 23 are each pivotally secured at 26 and adjacent their
interconnected end to a respective one of the horizontal supports
18. A locking clamp 27 is secured to one of the horizontal supports
18 and adapted to engage an associated one of the end members 24
when in either one of the two positions as illustrated respectively
by FIGS. 1 and 2.
As shown in FIG. 1, when the end members 24 are positioned
rearwardly under the seat portion 13 of the seat 11, the seat 11 is
in a vertical position. By disengaging the locking clamp 27 and
retracting the end members 24 forwardly to a position as shown in
FIG. 2, the seat 11 is in an inclined or rest position. One of the
end members 24 may be extended to constitute a lever arm 24'.
Referring more particularly to FIGS. 1 to 3, there is shown that
the upper end 16 of the vertical support members 15 are pivotally
attached to a respective side wall 20 of the backrest 12 of the
seat through a pivoting link 30 pivotally secured at one end 31 to
an associated vertical support member 15 and pivotally secured at
its other end 32 to the protective side wall 20 of the backrest 12.
As can be seen, the protective side wall 20 is forwardly projecting
from the backrest and seat portion whereby to provide protection of
a child sitting in the seat. The side wall 20 has a portion thereof
33 which is of substantially channel cross section defining two
spaced-apart walls 34, see FIG. 3. The link 30 is pivotally secured
in a channel bracket 35 which is secured between the spaced-apart
walls 34 whereby to provide a rigid pivotal connection at the end
32 of the link 30 with the set 11. The channel bracket 35 is
secured by suitable means such as bolts or rivets extending through
the two walls 34 and the side wall 35' of the bracket 35. A hinge
pin 36 extends through the bracket 35 and the link 30 whereby to
provide the pivotal connection.
As shown in FIGS. 1 and 2, the set 11 is formed as an integrally
molded part made of moldable material such as plastic material or
other suitable material. Also, as shown in FIG. 1, the side wall 20
of the seat adjacent the seat portion 13 may be provided with one
or more pairs of holes 27 whereby to provide alternate connections
of the connecting member 19 to position the seat at other angles
relative to the support frame 14. Further, the connecting member 19
may be secured to the seat at another position, for example, under
the seat or there may be provided two such connecting members 19 on
each side of the seat 11. Still further, the actuable lever
framework 23 may be constructed differently with the lever arm 24'
formed with the end member 24 to which the connecting member is
pivotally secured. The locking clamp 27 would also be provided on
the same side of the support frame 14 as the end member 24 to which
the locking clamp is secured. Furthermore, the seat may be molded
with reinforcing ribs 28 formed integrally therewith and extending
transversely across the seat portion 13 and the backrest 12.
Referring now to FIGS. 1, 2 and 4, there is shown the construction
of a belt attachment clamp 40 secured between the horizontal
support members 18 and more particularly, to cross members 41
bridging the horizontal support members 18 and secured to a corner
angle bracket 42 interconnecting each vertical back support member
15 to its respective horizontal support member 18 to provide a
rigid support frame. The belt attachment clamp 40 is secured
substantially centrally between the horizontal support members 18
although other convenient locations for such clamp may be provided
as long as it fulfills its intended purpose, that being to clamp a
retaining belt 43 to the support frame 14. The belt 43 is normally
provided with the seats of automobiles, and adapted to extend over
the waist or laps of a person sitting on the automobile seat.
Referring now more particularly to FIG. 4, there is shown in detail
the construction of the belt attachment clamp 40. The clamp 40
comprises a base channel member 44 having two parallel side walls
45 and a hook member 46 protruding at one end of the base channel
44 and extending above the parallel side walls 45 and terminating
into an outwardly curved or hook end 47. A belt wedge element 48 is
pivotally secured at one of its ends to the other end of the base
channel 44 between end projections 49 of the side walls 45. The
wedge element 48 is comprised of two parallel walls 50,
substantially triangular in surface area, and defining belt
clamping lower edges 51 adapted to be positioned in the channel
member 44 between the side walls 45. A clamp lever plate 52 is
pivotally secured to the free end of the wedge element 48, adjacent
the opposite edge to the belt clamping edges 51. The clamp lever
plate 52 is provided with an attaching loop 53 which is pivotally
retained in the plate 52 and adapted to engage with the hook end 47
of the hook member 46 whereby to rigidly retain the wedge element
48 in the base channel 44 with the clamp lever thereover, as shown
in FIG. 1.
As shown in FIG. 1, with the attaching loop 53 engaging with the
hook member 46 and the lever plate 52 clamped downwardly over the
channel member 44, a very tight connecton is provided between the
lever plate 52 and the hook member 47 as the attaching loop 53 is
slightly inset, thus applying tension on the hook member 47 to
rigidly secure a porton of a retaining belt 43, positioned across
the two parallel side walls 45 of the base channel 44, under the
wedge element 48. Thus, the support frame 14 may be rigidly
attached to a vehicle seat and the vehicle framework by means of
the retaining safety belts 43 which are commonly provided with such
vehicles.
Referring now to FIGS. 1 and 5 to 7, there is shown a safety strap
structure for immovably securing the seat 11 and support frame 14
to a rigid external structure (not shown). The safety strap
structure further provides shock absorbing retention of the person
sitting in the seat 11 upon forward movement of that person
relative to the seat and when exerting a predetermined pressure
against certain ones of the straps of the structure. As shown more
clearly in FIG. 5, the safety strap structure comprises two
shoulder straps 60 constructed of rigid strapping material such as
utilized for safety belts normally provided in automobiles. The
shoulder straps 60 are provided with shock absorbing expandable
means 61 constituted by a section of each shoulder strap 60 being
folded in abutment and aligned relationship with each other and
secured along this section by a plurality of spaced-apart
transverse rows of stitches 62. Upon application of a predetermined
force along the shoulder straps 60, between the shock absorbing
section 61, the rows of stitches will break in sequential order, in
the direction from row 62' to row 62", thus permitting the person
in the seat to move gradually forward to absorb the shock to which
it is subjected at the time of impact of the vehicle.
The shoulder straps 60 are guided over a respective shoulder of the
person sitting in the seat by means of guide apertures 63 provided
on each side in the upper part of the backrest 12. As shown in FIG.
5, there may be provided a plurality of aligned pairs of apertures
63 whereby to accommodate children of varying sizes. Normally, this
type seat is utilized for seating young children and thus the
spacing between the rows of guide apertures is determined by the
size range of such children. Further, the shock absorbing sections
61 are preferably, although not exclusively, provided in the
portion of the shoulder straps 60 extending rearwardly of the
backrest 12 whereby not to interfere with the person sitting in the
seat.
As shown in FIG. 5, each end of the shoulder straps 60 are attached
to a strap connector 64 and 65, respectively. The upper end of the
straps 60 are permanently secured to connector 64. An adjustable
attachment strap 66 is also connected to connector 64 and has an
attachment clamp 67 at one end thereof for securement to the
framework of a vehicle, whilst the other end of the strap 66 is
secured to the connector 64 by a hook plate member 68 providing
rigid retention of the strap 66 between the attachment clamp 67 and
the connector 64. The strap connector 64 is further attached to the
backrest 12 of the seat 11 by an adjustable seat attachment strap
69 secured between the strap connector 64 and the backrest 12. A
portion of the free end of the attachment strap 69 is passed
through an aperture (not shown) located substantially centrally
between a pair of apertures 63 in the upper end of the backrest 12
and is engaged with the backrest by an S-shaped bracket 70 which
positively engages the strap 66 and prevents it from being pulled
back through the aperture. Thus, the seat 11 is rigidly anchored to
the vehicle structure via the strap 69, the connector 64, the strap
66 and the attachment clamp 67.
Referring now to FIGS. 6 and 7a and 7b, there is shown the
construction of the metal hook plate member 68. The plate member 68
has a hook plate 80 having flat wall portion 80' and a hook flange
81 at one end thereof securable within a slot 82 provided in the
strap connector 64. An aperture 83 is provided through the plate 80
for receiving the strap 66 therethrough. A cover plate 84 having a
top wall 85 and transverse side walls 86 is secured in
juxtaposition with the flat wall 80'. A vertical groove 87 is
provided in the forward portion of each side wall 86 and receives
and engages with a pin projection 88, formed in the sides of the
wall portion 80', whereby the cover plate 84 and hook plate 80 may
secure a portion of the strap 66 associated therewith. A retention
member 80" also passes through and resiliently engages with the end
walls of a retention aperture 85' provided in the top wall 85 of
the plate 84 to retain the plate 84 over the plate 80. A slot 89 is
further provided adjacent an edge of the top wall 85 of plate 84
for registry with a portion of the aperture 83 whereby the securing
strap 66 may be clamped to the hook plate 80 by passing the strap
66 below the hook plate 80, through the aperture 83 and then over
the leading edge 84' of the cover plate 84 into the slot 89 and
then back through the aperture 83. The attachment clamp 67 at the
securing end of the strap 66 is fastened rearwardly of the hook
plate member 68 with both portions of the strap 66 in juxtaposition
under the plate 80. Thus, the strap 66 will be positively clamped
at its portion extending through the aperture 83 and slot 89 and
between the slot 89 and the rear edge 83' of the aperture 83.
Referring now to FIG. 5, it is seen that the lower end of the
shoulder straps 60 is secured to a further strap connector 65, as
above-mentioned. The connector 65 is formed of metal and consists
of two identical L-shaped connector plates 90 having a vertical arm
91 and a transverse horizontal arm 92 formed integrally therewith
and extending from an end of the arm 91. A belt receiving slot 93
is formed longitudinally in the arm 91. A further belt receiving
slot 94 is also formed longitudinally adjacent the upper edge 96 of
the arm 92. A further slot 95 is provided in the arm 92 below the
slot 94. As shown, the lower end of each shoulder strap 60 is
adjustably secured in the slot 94 of a respective one of the
L-shaped connector plates. The adjustable buckles 74 provide
adjustment of the length of the shoulder straps 60 and retention in
the slots 94.
A further adjustable belt 77 extends from one of the slots 93 and
permanently secured thereto. The free end of the belt 77 extends
through a respective one of two aligned slots 76 each provided in a
respective side wall 20 of the seat 11 adjacent the seat portion 13
and passes under the seat 13 through the other slot 76, into the
slot 93 of the other connector plate 90, and back through the said
other slot 76. The free end of the belt 77 is then adjustably
secured to the portion of itself by means of an adjustable buckle
78. A further strap 75 is looped at one end 75' about the strap 77
under the seat 11 and passes through a slot 76" centrally located
adjacent the front edge of the seat 13. A securing tab 76 is
provided at the other end of the strap 75. The tab 76 secured the
connector plates 90 together by juxtaposing both slots 95 with each
arm 91 positioned outwardly, as shown in FIG. 5. The tab is passed
through both aligned slots 95 and secured. Thus, a person sitting
in the seat is rigidly held therein by means of shoudler straps 60
extending substantially downwardly in a V-configuration down to the
connector 65. A waist or lap belt 77 then extends across the lap or
waist of the person and securing strap 75 extends between the legs
of the person. Thus, the lower part of the person's body is rigidly
held and it can be seen that, on impact, the upper part of the body
of the person will move slightly forward applying tension along the
shoulder straps 60 causing the rows of stitches 62 in the shock
absorbing section 61 to break and thus providing releasable
retention of the person's upper body portion whereby to dampen the
shock on impact.
The assembly and operation of the safety seat structure as
hereinabove described will now be explained. The seat support frame
14 is rigidly held in the desired position by operating the lever
framework 23 as previously described. The support frame is then
positioned on an automobile seat and secured to the seat by the
safety retaining belt 43 which is normally provided for engagement
across the lap of a person sitting in the automobile seat. This
strap 43 is engaged by the belt attachment clamp 40 as previously
described. Thus, the bottom rearward portion of the support frame
14 is rigidly retained on the seat and to the vehicle structure as
the belt 43 is attached thereto. The upper portion of the backrest
12 of the seat 11 is then secured to a convenient part of the
vehicle structure. If the seat 11 is to be secured on the back seat
of an automobile, the attachment clamp 67 at the end of the strap
66 is secured to the framework rearwardly of the backrest of the
automobile seat below the rear windshield.
The connector plates 90 of connector 65 are disconnected to permit
the person to be seated in the seat 11. The shoulder straps 60 and
the further adjustable belt 77 are then secured tautly by their
respective adjustable buckles whereby the person is comfortably
seated and held in the seat 11. If the automobile to which the seat
11 is secured is involved in an accident sufficient to cause an
impact, the seat 11 will not move forwardly on impact as it is
secured to the vehicle framework. However, the person sitting in
the seat will be subjected to a forward momentum caused by this
impact and will apply a tension along the longitudinal axis of the
shoulder straps 60. If this tension exceeds a predetermined force,
it will cause the rows of stitches 62 in the shock absorbing
extension 61 to break in a sequential order, from stitches 62' to
stitches 62", causing the forward movement of the person's body to
be arrested gradually within a predetermined displacement range
whereby to provide shock absorbing retention of the body.
* * * * *