U.S. patent application number 10/260848 was filed with the patent office on 2004-04-01 for vehicle seat assembly with energy managing member.
This patent application is currently assigned to Lear Corporation. Invention is credited to Humer, Mladen, Lambrecht, Stephen G..
Application Number | 20040061364 10/260848 |
Document ID | / |
Family ID | 31977930 |
Filed Date | 2004-04-01 |
United States Patent
Application |
20040061364 |
Kind Code |
A1 |
Humer, Mladen ; et
al. |
April 1, 2004 |
VEHICLE SEAT ASSEMBLY WITH ENERGY MANAGING MEMBER
Abstract
A vehicle seat assembly for use with a vehicle includes a seat
cushion frame adapted to be installed in the vehicle. An energy
managing support bracket is attached to the seat cushion frame, and
a recliner mechanism is attached to the support bracket. The
assembly also includes a seat back frame connected to the recliner
mechanism such that the seat back frame is pivotable with respect
to the seat cushion frame. Furthermore, the support bracket is
configured to attenuate energy associated with a rear impact to the
vehicle when the assembly is installed in the vehicle, so as to
inhibit rebound of the seat back frame.
Inventors: |
Humer, Mladen; (Eastpointe,
MI) ; Lambrecht, Stephen G.; (New Hudson,
MI) |
Correspondence
Address: |
BROOKS KUSHMAN P.C. / LEAR CORPORATION
1000 TOWN CENTER
TWENTY-SECOND FLOOR
SOUTHFIELD
MI
48075-1238
US
|
Assignee: |
Lear Corporation
21557 Telegraph Road
Southfield
MI
48034
|
Family ID: |
31977930 |
Appl. No.: |
10/260848 |
Filed: |
September 30, 2002 |
Current U.S.
Class: |
297/216.14 |
Current CPC
Class: |
B60N 2/4228 20130101;
B60N 2/42709 20130101 |
Class at
Publication: |
297/216.14 |
International
Class: |
B60N 002/42 |
Claims
What is claimed is:
1. A vehicle seat assembly for use with a vehicle, the assembly
comprising: a seat cushion frame adapted to be installed in the
vehicle; an energy managing support bracket attached to the seat
cushion frame; a recliner mechanism attached to the support
bracket; and a seat back frame connected to the recliner mechanism
such that the seat back frame is pivotable with respect to the seat
cushion frame; wherein the support bracket is configured to
attenuate energy associated with a rear impact to the vehicle when
the assembly is installed in the vehicle, so as to inhibit rebound
of the seat back frame.
2. The assembly of claim 1 wherein the support bracket has an
aperture for attenuating energy.
3. The assembly of claim 2 wherein the support bracket has a hole
extending above the aperture, and the assembly further includes a
fastening member that extends through the hole for connecting the
support bracket to the seat cushion frame.
4. The assembly of claim 2 wherein the aperture is an arcuate
slot.
5. The assembly of claim 1 wherein the support bracket includes two
apertures for attenuating energy.
6. The assembly of claim 5 wherein each aperture is an arcuate
slot, and the arcuate slots are disposed next to each other.
7. The assembly of claim 6 wherein the support bracket has a hole
extending above the arcuate slots, and the assembly further
includes a fastening member that extends through the hole for
connecting the support bracket to the seat cushion frame.
8. The assembly of claim 6 wherein the support bracket has front
and rear ends, and the arcuate slots are disposed proximate the
front end.
9. The assembly of claim 1 wherein the support bracket has an
attachment location attached to the seat cushion frame, a first
portion disposed proximate the attachment location and having a
first thickness, and a second portion disposed away from the
attachment location and having a second thickness greater than the
first thickness, the first portion being configured to attenuate
energy associated with the rear impact.
10. The assembly of claim 1 wherein the support bracket includes
first and second sections that respectively define first and second
attachment locations that are attached to the seat cushion frame,
and a tapered section disposed between the first and second
sections, the tapered section being configured to attenuate energy
associated with the rear impact.
11. The assembly of claim 1 wherein the support bracket includes at
least one fold that is configured to attenuate energy associated
with the rear impact.
12. The assembly of claim 1 wherein the support bracket includes
front and rear attachment locations that are attached to the seat
cushion frame, and multiple folds that extend generally radially
relative to the rear attachment location, wherein the folds are
configured to attenuate energy associated with the rear impact.
13. The assembly of claim 1 wherein the support bracket includes a
main body having front and rear attachment locations that are
attached to the seat cushion frame, and a retaining member attached
to the main body proximate the front and rear attachment
locations.
14. The assembly of claim 13 wherein the main body comprises a
first material, and the retaining member comprises a second
material different than the first material.
15. The assembly of claim 1 further comprising a seat adjustment
mechanism attached to the seat cushion frame and adapted to be
attached to the vehicle, the seat adjustment mechanism being
configured to adjust the seat cushion frame forwardly and
rearwardly with respect to the vehicle when the seat adjustment
mechanism is attached to the vehicle.
16. A vehicle seat assembly for use with a vehicle, the assembly
comprising: a seat cushion frame adapted to be installed in the
vehicle; a support bracket having an attachment location attached
to the seat cushion frame, the support bracket further having an
aperture disposed proximate to the attachment location; a recliner
mechanism attached to the support bracket; and a seat back frame
connected to the recliner mechanism such that the seat back frame
is pivotable with respect to the seat cushion frame; wherein the
support bracket is configured to plastically deform proximate the
aperture when a sufficient rearward force is applied to the seat
back frame, so as to inhibit rebound of the seat back frame as the
rearward force diminishes.
17. The assembly of claim 16 wherein the support bracket has a hole
extending above the aperture, and the assembly further includes a
fastening member that extends through the hole for connecting the
support bracket to the seat cushion frame.
18. The assembly of claim 16 wherein the aperture is an arcuate
slot.
19. The assembly of claim 18 wherein the support bracket further
includes an additional arcuate slot disposed beneath the arcuate
slot, and wherein the support bracket is configured to plastically
deform proximate the arcuate slots.
20. The assembly of claim 19 wherein the support bracket has a hole
extending above the arcuate slots, and the assembly further
includes a fastening member that extends through the hole for
connecting the support bracket to the seat cushion frame.
21. The assembly of claim 19 wherein the support bracket has front
and rear ends, and the arcuate slots are disposed proximate the
front end.
22. The assembly of claim 16 wherein the support bracket has a
first thickness proximate the aperture, and a second thickness
greater than the first thickness at a majority of the support
bracket disposed away from the aperture.
23. The assembly of claim 16 wherein the support bracket has front
and rear ends and a tapered section disposed between the ends, the
tapered section being configured to plastically deform when the
rearward force is applied to the seat back frame.
24. The assembly of claim 16 further comprising a seat adjustment
mechanism attached to the seat cushion frame and adapted to be
attached to the vehicle, the seat adjustment mechanism being
configured to adjust the seat cushion frame forwardly and
rearwardly with respect to the vehicle when the seat adjustment
mechanism is attached to the vehicle.
25. A vehicle seat assembly for use with a vehicle, the assembly
comprising: a seat cushion frame adapted to be installed in the
vehicle; first and second sacrificial, energy managing support
brackets that each have first and second attachment locations
attached to the seat cushion frame, each support bracket further
having first and second ends and multiple folds disposed generally
between the ends; first and second recliner mechanisms respectively
attached to the first and second support brackets; and a seat back
frame connected to the recliner mechanisms such that the seat back
frame is pivotable with respect to the seat cushion frame; wherein
each support bracket is configured to plastically deform proximate
the folds when a sufficient rearward force is applied to the seat
back frame, so as to inhibit rebound of the seat back frame as the
rearward force diminishes and to inhibit structural damage to the
recliner mechanisms and the seat back frame.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to vehicle seat assemblies for use
with motor vehicles.
[0003] 2. Background Art
[0004] A vehicle seat assembly for use with a motor vehicle may
include a seat cushion frame connected to a seat back frame by a
pair of pivotable joints. The pivotable joints allow the seat back
frame to pivot with respect to the seat cushion frame. Examples of
vehicle seat assemblies are disclosed in U.S. Pat. Nos. 5,219,202
and 6,022,074.
SUMMARY OF THE INVENTION
[0005] Under the invention, a vehicle seat assembly for use with a
vehicle includes a seat cushion frame adapted to be installed in
the vehicle. An energy managing support bracket is attached to the
seat cushion frame, and a recliner mechanism is attached to the
support bracket. The assembly also includes a seat back frame
connected to the recliner mechanism such that the seat back frame
is pivotable with respect to the seat cushion frame. Furthermore,
the support bracket is configured to attenuate energy associated
with a rear impact to the vehicle when the assembly is installed in
the vehicle, so as to inhibit rebound of the seat back frame.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a perspective view of a vehicle seat assembly
according to the invention mounted to a floor of a motor vehicle,
with a portion of a seat back cushion broken away to show interior
components of the assembly;
[0007] FIG. 2 is a side view of the assembly showing an energy
managing support bracket connected between a seat cushion frame and
a seat back frame;
[0008] FIG. 3 is an exploded side view of the assembly;
[0009] FIG. 4 is a side view of the assembly showing the support
bracket plastically deformed as a result of a rear impact to the
vehicle;
[0010] FIG. 5 is a side view of a second embodiment of the support
bracket according to the invention;
[0011] FIG. 6 is a side view of a third embodiment of the support
bracket according to the invention; and
[0012] FIG. 7 is a fragmentary cross-sectional view of the support
bracket of FIG. 6 taken along line 7-7 and viewed in the direction
of the arrows.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0013] FIGS. 1-3 show a vehicle seat assembly 10 according to the
invention for use with a motor vehicle 12. The seat assembly 10
includes a lower seat cushion frame 13 that supports a lower seat
cushion 14, and is adapted to be installed in the vehicle 12. In
the embodiment shown in FIGS. 1-3, for example, the seat cushion
frame 13 is attached to a seat adjustment mechanism 16, which is
attached to floor 18 of the vehicle 12. The seat adjustment
mechanism 16 may include a fore-aft adjuster 20 for adjusting the
seat cushion frame 13 forwardly and rearwardly with respect to the
vehicle 12. Alternatively or supplementally, the seat adjustment
mechanism 16 may include a height adjuster 22 for adjusting the
height of the seat cushion frame 13. As yet another alternative,
the seat assembly 10 may be provided without a seat adjustment
mechanism, and the seat cushion frame 13 may be attached to the
floor 18, or otherwise installed in the vehicle 12, in any suitable
manner.
[0014] The seat assembly 10 also includes a pair of sacrificial,
energy managing support brackets 24 attached to opposite sides of
the seat cushion frame 13 in any suitable manner (only right side
support bracket 24 is shown in FIGS. 1-3). For example, each
support bracket 24 may be provided with first and second attachment
locations, such as front and rear attachment locations 26 and 28,
respectively, that are attached to the seat cushion frame 13. In
the embodiment shown in FIGS. 1-3, the front attachment location 26
is disposed proximate front end 29 of the support bracket 24, and
rear attachment location 28 is disposed proximate rear end 30 of
the support bracket 24. Each of the attachment locations 26 and 28
may also include a hole, and the seat assembly 10 may further
includes fastening members 31 that extend through the holes so as
to attach each support bracket 24 to the seat cushion frame 13.
Furthermore, in the embodiment shown in FIGS. 1-3, the support
brackets 24 are not attached to the seat adjustment mechanism
16.
[0015] Each support bracket 24 is also configured to absorb or
otherwise attenuate rear impact energy, as explained below in
greater detail. More specifically, each support bracket 24 may be
provided with one or more energy attenuating features. In the
embodiment shown in FIGS. 1-3, for example, each support bracket 24
includes first and second apertures 32 and 34, respectively,
disposed generally beneath, or otherwise proximate to, the front
attachment location 26. These apertures 32 and 34 create weak
points in the support brackets 24 that will plastically deform when
subjected to sufficient loading. While each aperture 32 and 34 may
have any suitable configuration, such as a rectangular slot or a
circular opening, each aperture 32 and 34 shown in FIGS. 1-3 is an
arcuate slot. Alternatively, each support bracket 24 may be
provided with one or more apertures that are configured to
attenuate energy associated with a rear impact. Furthermore, such
apertures may be disposed proximate the front attachment location
26, proximate the rear attachment location 28, and/or elsewhere
within each support bracket 24.
[0016] As another example, in lieu of or in addition to one or more
apertures, such as the apertures 32 and 34, each support bracket 24
may be formed with a reduced thickness proximate the front
attachment location 26, as compared with other portions of the
support bracket 24. For instance, each support bracket 24 may have
a thickness in the range of 1-2 millimeters (mm) generally beneath
the front attachment location 26, and a thickness in the range of
3-5 mm for the remainder of the support bracket 24. Such a
configuration provides a weak point proximate the first attachment
location 26 that will plastically deform when subjected to
sufficient loading. Alternatively or supplementally, each support
bracket 24 may be formed with a reduced thickness proximate the
rear attachment location 28, as compared with other portions of the
support bracket 24.
[0017] While the support brackets 24 may comprise any suitable
deformable material, in one embodiment of the invention, each
support bracket 24 comprises metal. For example, each support
bracket 24 may comprise stamped steel, aluminum and/or titanium. As
another example, each support bracket 24 may comprise cast aluminum
or magnesium.
[0018] Returning to FIGS. 1-3, the seat assembly 10 also includes a
seat back frame subassembly 35 attached to and fully supported by
the support brackets 24. The seat back frame subassembly 35
includes a pair of pivot or recliner mechanisms 36, and each
recliner mechanism 36 is attached to a respective support bracket
24 (only right side recliner mechanism 36 is shown in FIGS. 1-3).
While the recliner mechanisms 36 may be attached to the support
brackets 24 in any suitable manner, in the embodiment shown in
FIGS. 1-3, each recliner mechanism 36 is attached to a respective
support bracket 24 with removable fasteners 37, such as bolts. Each
recliner mechanism 36 includes first and second portions 38 and 39,
respectively, and each first portion 38 is pivotable with respect
to a respective second portion 39.
[0019] The seat back frame subassembly 35 also includes a seat back
frame 40 that supports a seat back cushion 42. The seat back frame
40 is connected to the recliner mechanisms 36 such that the seat
back frame 40 is pivotable with respect to the seat cushion frame
13. In the embodiment shown in FIGS. 1-3, the seat back frame 40 is
attached to the recliner mechanisms 36 with removable fasteners 44,
such as bolts. Alternatively, the seat back frame 40 may be
attached to the recliner mechanisms 36 in any suitable manner, such
as by welding the recliner mechanisms 36 to the seat back frame
40.
[0020] Advantageously, as mentioned above, the support brackets 24
are configured to attenuate rear impact energy. For example,
referring to FIG. 4, when the vehicle 12 is subjected to a
sufficient rear impact, such that an occupant (not shown) of seat
assembly 10 applies a sufficient rearward force F to the seat back
frame 40, the support brackets 24 will plastically deform so as to
reduce or otherwise inhibit rebound of the seat back frame 40.
Rebound refers to the tendency of the seat back frame 40 to spring
forward after the rearward force F diminishes. As shown in FIG. 4,
plastic deformation may occur proximate the apertures 32 and 34.
Depending on the severity of the rear impact, each support bracket
24 may deform in such a manner that each fastening member 31,
extending through a respective front attachment location 26, may
extend into one or both of the apertures 32 and 34 of the support
bracket. Alternatively or additionally, each support bracket 24 may
plastically deform proximate weak points created by reduced
material thicknesses.
[0021] Preferably, each support bracket 24 includes a stop feature
for inhibiting plastic deformation of the support bracket 24 beyond
a maximum amount, to thereby inhibit the seat back frame 40 from
pivoting rearwardly beyond a desired maximum point during an impact
event. For example, the portion of the support bracket 24 disposed
beneath the apertures 32 and 34 may function as such a stop
feature.
[0022] If one or both support brackets 24 experiences significant
deformation, the support brackets 24 may be removed from the seat
assembly 10 by removing the fasteners 31 and 37. New support
brackets 24 may then be connected between the seat cushion frame 13
and the recliner mechanisms 36. With such a configuration,
depending on the severity of the rear impact, the other components
of the seat assembly 10 may be able to be reused. Thus, the support
brackets 24 function as sacrificial, energy absorbing members that
reduce or eliminate structural damage to the other components of
the seat assembly 10, such as the seat cushion frame 13, recliner
mechanisms 36 and/or seat back frame 40.
[0023] FIG. 5 shows a second embodiment 24.gtoreq. of the support
bracket (right side support bracket 24' is shown in FIG. 5), which
includes a shape that provides an energy attenuating feature. More
specifically, the support bracket 24' includes a tapered section 46
disposed between first and second wider sections 48 and 50,
respectively, and the tapered section 46 provides a weak point that
plastically deforms when subjected to sufficient loading. When the
tapered section 46 is subjected to sufficient bending loading as a
result of a rear impact, for example, the tapered section 46 will
elongate. Alternatively, the shape of the support bracket 24' may
be designed to provide multiple weak points that plastically deform
when subjected to sufficient loading.
[0024] Depending on the severity of the impact, the loading on the
tapered section 46 may become mostly tensile loading after a
certain amount of plastic deformation has occurred. Advantageously,
the tapered section 46 may be configured to act as a stop feature
when subjected to tensile loading to inhibit further deformation of
the support bracket 24'.
[0025] FIGS. 6 and 7 show a third embodiment 24" of the support
bracket (right side support bracket 24" is shown in FIG. 6), which
includes multiple convolutions, such as folds 52, that function as
energy attenuating features. Furthermore, each fold 52 may extend
generally radially from rear attachment location 28. When the folds
52 are subjected to sufficient bending and/or tensile loading, one
or more of the folds 52 will plastically deform. More specifically,
one or more of the folds 52 will partially or completely flatten
out or straighten when subjected to sufficient loading as a result
of a rear impact. Advantageously, when a particular fold 52
sufficiently flattens out, the particular fold 52 will then act as
a stop feature that inhibits further plastic deformation of the
support bracket 24" at the particular fold 52.
[0026] Alternatively, the support bracket 24" may include one or
more folds that each provide a weak point. Furthermore, such folds
may be oriented generally transversely to the direction of tensile
loading during a rear impact.
[0027] The support bracket 24" may also include a retaining member,
such as an elongated retaining bar 54, that extends from a point
proximate the front attachment location 26 to a point proximate the
rear attachment location 28. The retaining bar 54, which may
comprise any suitable material such as steel, helps to maintain
proper spacing between the attachment locations 26 and 28 during
and after an impact event. Furthermore, the retaining bar 54 may be
attached to main body 56 of the support bracket 24" in any suitable
manner. For example, the retaining bar 54 may be attached to main
body 56 with mechanical fasteners 58, such as bolts or screws.
[0028] It should be noted that support brackets according to the
invention may each be provided with one or more of the energy
attenuating features described above in detail. For example, each
support bracket of a seat assembly according to the invention may
include one or more apertures, one or more reduced thickness
portions, one or more tapered sections, and/or one or more
convolutions.
[0029] Furthermore, support brackets according to the invention may
be provided with or without a retaining member described above, for
maintaining desired spacing between the attachment locations 26 and
28. In one embodiment of the invention, for example, a support
bracket is provided with a stamped aluminum main body and a steel
retaining member attached to the main body with bolts. With such a
configuration, the retaining member is provided with a greater
tensile strength than the main body of the support bracket.
[0030] In addition, each support bracket may be configured to
plastically deform only if a rear impact occurs at a great enough
speed, such as greater than 6 to 8 miles per hour (mph). If only
minor plastic deformation occurs, the support brackets may be able
to be reused. If significant plastic deformation occurs, the
support brackets may need to be replaced, while the rest of the
seat assembly may remain usable and relatively undamaged.
[0031] While embodiments of the invention have been illustrated and
described, it is not intended that these embodiments illustrate and
describe all possible forms of the invention. Rather, the words
used in the specification are words of description rather than
limitation, and it is understood that various changes may be made
without departing from the spirit and scope of the invention.
* * * * *