JPH092122A - Locking device for reclining seat back - Google Patents

Abstract

PURPOSE: To prevent a reclining seat more surely from being flat down due to breakdown or the like of a locking mechanism resulting from application of large load from the rear side of a vehicle at the time of collision or the like. CONSTITUTION: The second bent part 54 overhanging to the rear side of a vehicle is fitted onto a striker 36 fixed on a vehicle side wall 16a, and the first bracket 38 provided with an engagement hole 60 capable of engaging with the second bent part 54 when the frame 32 of a reclining seat back is deflectively-deformed as indicated by chain double-dashed lines is disposed integrally onto the frame 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a foldable seat back, and more particularly, to prevent the foldable seat back from falling down even when a large force is applied in the direction toward the front of the vehicle in the event of a collision. It is related to the technology.

[0002]

2. Description of the Related Art Some passenger automobiles having a luggage room or a trunk room behind a rear seat have a seat back of the rear seat which can be laid down on the front side of the vehicle so that a long object or the like can be loaded. 6 and 7 show an example of the split type retractable seat back 10, which includes a pair of retractable seat backs 10a and 10b. As shown in FIG. 6, the retractable seat backs 10a and 10b are arranged rotatably around support shafts (hinge points) 12 that are substantially parallel to the vehicle width direction at their lower ends, and are indicated by alternate long and short dash lines. As shown in FIG. 4, the seat cushion 14 can be laid on the front side of the vehicle so as to be stacked on the seat cushion 14. Also,
Locking mechanisms 18a and 18b including hook members are provided on the upper portions of the side portions of the retractable seatbacks 10a and 10b on the vehicle side walls 16a and 16b side, and the hook members are attached to the vehicle side walls 16a and 16b. The retractable seat backs 10a and 10b are each held in an upright state by being locked with a fixed striker (not shown). A lock device is configured to include the lock mechanisms 18a and 18b and the striker.

[0003]

However, in such a conventional retractable seat back, the luggage in the luggage room is pressed by the seat back with a large force when the vehicle collides and the like. If the center side portion in the vehicle width direction is flexibly deformed so as to be displaced toward the front side of the vehicle, the hook mechanism may be disengaged from the striker, or a large load may be applied to the hook member, which may damage the lock mechanism. , The seat back might fall over. Such a problem is particularly remarkable in the split type retractable seat back 10 in which the central portion in the vehicle width direction is free as shown in FIGS. 6 and 7, and as shown in FIG. 7, for example. When a large load F is applied from the luggage room 20 side, the pair of retractable seat backs 10a and 10b are flexibly deformed with the locking portions of the lock mechanisms 18a and 18b and the striker as fulcrums as shown by the alternate long and short dash line, and then divided. The part is displaced most.

On the other hand, for example, JP-A-6-20648
As described in Japanese Patent Publication No. 6, it has been proposed to provide a protector for preventing the deformation of the hook member locked with the striker and prevent the engagement with the striker from being disengaged due to the deformation of the hook member. Since the hook member still receives a large load applied to the seat back, the seat back may still fall down due to breakage of the lock mechanism. Since the lock mechanism is composed of several movable members such as a lock member that engages with the hook member and holds it in a locked state, it must have sufficient mechanical strength to withstand a large load such as a collision. Is difficult.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to more reliably prevent the folding of the retractable seat back in the event of a collision.

[0006]

According to a first aspect of the present invention, a side portion of a retractable seat back on the side wall of a vehicle is provided for holding a retractable seat back that can be laid down forward of a vehicle in an upright state. Is a locking device that is locked to a striker fixed to the vehicle side wall portion, and the hook member disposed on the upper part of the retractable seat back of the retractable seat back is locked when the hook member and the striker are locked. When the retractable seat back is flexibly deformed so that the center side portion in the vehicle width direction is displaced to the front side of the vehicle, it becomes possible to engage with the striker due to the deformation and directly engage with the striker. Therefore, a fall prevention member for preventing the fallable seatback from falling down is integrally fixed to the fallable seatback.

[0007]

In the locking device for such a retractable seat back, when the retractable seat back is flexibly deformed by an external force at the time of a collision, the locking device for the retractable seat back is integrated with the retractable seat back. The fixed fall prevention member can be engaged with the striker, and the fall of the retractable seatback is prevented by directly engaging the striker. That is, in addition to the hook member, the fall prevention member is engaged with the striker to prevent the fall of the retractable seat back, and in the conventional case in which the hook member and the striker are merely engaged to maintain the upright state. In comparison, the fall of the retractable seat back can be prevented more reliably.
In particular, since the fall prevention member is integrally fixed to the retractable seat back, it is possible to easily provide a sufficiently high strength as compared with a movable member such as a hook member.
As the retractable seat back is flexibly deformed, it can be engaged with the striker, so it is not normally engaged with the striker and does not interfere with the normal fall-down operation of the retractable seat back. .

[0008]

A second aspect of the present invention is the locking device for a retractable seat back according to the first aspect of the present invention, wherein (a) the hook member is provided around an axis substantially parallel to the vehicle width direction. It is rotatably arranged, and (b)
The striker includes a locking portion that locks the hook member substantially parallel to the vehicle width direction, a first curved portion that is bent from an end of the locking portion in a substantially vertical direction, and a first curved portion thereof. A second curved portion that is bent toward the rear side of the vehicle from the front end of the striker, and (c) the fall prevention member includes a second bend of the striker according to the bending deformation of the retractable seatback.
It is characterized in that it has an engaging hole that can be engaged with the bending portion, and prevents the foldable seatback from falling down by inserting the second bending portion into the engaging hole.

[0009]

That is, the second invention corresponds to an embodiment of the first invention, and the folding seatback is flexibly deformed with the engaging portion between the hook member and the striker as a fulcrum. By doing so, the engaging hole of the fall prevention member faces the second bent portion that is bent rearward of the vehicle, and the collapsible seatback will fall forward of the vehicle due to damage to the lock member or the like. Then, the second curved portion is inserted into the engaging hole, and the fall thereof is surely prevented. Further, when the engaging hole is opposed to the second curved portion, it is possible to allow a part of the fall prevention member to be engaged with the first curved portion and the second curved portion. In that case, Since the further displacement of the retractable seat back is suppressed by such engagement, the load and impact acting on the hook member are reduced, and the deformation of the hook member and the damage of the lock mechanism including the hook member are suppressed. As a result, the engagement between the hook member and the striker is maintained in a good condition, and even if the retractable seatback tries to fall to the front side of the vehicle due to breakage of the lock mechanism or the like, the engaging hole and the second curved portion Engagement with ensures that the fall is prevented.

Since the second curved portion is vertically spaced apart from the locking portion, the fall prevention member that can be engaged with the second curved portion also has a foldable seat back upright. In this state, it may be provided so as to be vertically separated from the engaging portion of the striker, and can be arranged in the retractable seat back without interfering with the hook member or the striker.

[0011]

A third aspect of the present invention is the locking device for a retractable seat back according to the first aspect of the present invention, wherein (a) the hook member extends around an axis substantially parallel to the vehicle width direction. It is rotatably arranged, and (b)
The striker has a locking portion to which the hook member is locked in substantially parallel to the vehicle width direction, and a tip bending portion bent from the tip of the locking portion to the front side of the vehicle, (C) The fall prevention member has an engaging portion that is engaged with the tip curved portion according to the flexural deformation of the collapsible seat back, and the collapsible portion is engaged with the tip curved portion to be folded A further feature of the present invention is that the hook member and the striker are maintained in a locked state by suppressing further displacement of the seat back.

[0012]

That is, the third aspect of the present invention corresponds to the first aspect of the first aspect of the present invention. When the retractable seat back is flexibly deformed in the upright state, the fall prevention member is engaged. The joint portion is engaged with the tip curved portion of the striker, and this engagement suppresses further displacement of the retractable seatback. As a result, the load and impact acting on the hook member are reduced, deformation of the hook member and damage to the lock mechanism including the hook member are suppressed, and the hook member and striker are kept in a good locked state, and the hook member does not fall over. The seat back is held upright.

Since the bent portion of the striker is bent toward the front side of the vehicle, the fall prevention member engaged with the bent portion of the striker has the locking portion of the striker in the upright state of the retractable seat back. It does not need to reach up to and can be installed in a retractable seat back without interfering with the locking part.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. The lock device 30 shown in FIGS. 1 and 2 is an embodiment of the invention described in claim 2, and is the same as the lock device 30 shown in FIGS.
1 is used as a locking device for the retractable seat back 10a of the left seat in the split type retractable seat back 10 shown in FIG. 1, and FIG. 1 is a plan view partially cut away with the front side of the vehicle as the upper side of the drawing. 2 and 3 are perspective views. The lock device 30 includes a lock mechanism 34 arranged on the frame 32 of the retractable seat back 10a and a striker 36 fixedly mounted on the vehicle side wall 16a. The lock mechanism 34 includes a base bracket 37 having a U-shaped cross section and integrally fixed to the frame 32 by two bolts 35, a pair of first brackets 38, and a second bracket 38.
The bracket 40 and the brackets 38, 40 are rotatably arranged around an axis substantially parallel to the vehicle width direction, and the retractable seat back 10a is locked to the striker 36 by standing. In addition to the hook member 42, a lock member (not shown) that positions the hook member 42 at the lock position, a release operation member 44 that moves the lock member to unlock the hook member 42, and the like.

The striker 36 includes the first bracket 3
As is apparent from the perspective view of FIG. 3 shown together with FIG. 8, the male screw portion 48 screwed into the vehicle side wall 16a and the hook member 42 are substantially parallel to the vehicle width direction when fixed to the vehicle side wall 16a. The locking portion 50 that is made to move, the first curved portion 52 that is bent upward from the tip of the locking portion 50 at a substantially right angle, and the first curved portion 52 that is bent at a substantially right angle to the rear side of the vehicle from the tip of the first curved portion 52. And a second bending portion 54. The first bracket 38 is positioned between the first curved portion 52 and the second curved portion 54 of the striker 36 and the vehicle side wall 16a when the retractable seat back 10a is in the upright state. A notch 56 is provided to prevent interference with the locking portion 50. Further, an extending portion 58 extending toward the rear side of the vehicle is provided at a portion located on the upper side of the notch 56 in the upright state of the retractable seat back 10a, and a tip portion of the extending portion 58 is provided. 1 is obliquely bent toward the inside of the vehicle as is apparent from FIG.

An engaging hole 60 is provided at the tip of the extending portion 58, and the hook member 42 and the striker 36 are provided.
The retractable seat back 10a is flexibly deformed so that the center side portion in the vehicle width direction of the retractable seat back 10a is displaced toward the front side of the vehicle when locked, as shown by the chain double-dashed line in FIG. When the frame 32 and the first bracket 38 are displaced, the engagement hole 60 is opposed to the second curved portion 54 of the striker 36 in the vehicle front-rear direction,
Engageable. Therefore, even if the retractable seatback 10a tries to fall forward of the vehicle due to damage to the lock mechanism 34 or the like in that state, the second bend portion 54 is inserted into the engagement hole 60 to reliably prevent the fall. It The first bracket 38 provided with the engagement hole 60 corresponds to a fall prevention member. In the normal state shown by the solid line in FIG. 1, the tip of the extending portion 58 is the second curved portion 5 of the striker 36.
The foldable seat back 10a can be laid down without interfering with the foldable seat back 4.

Thus, the locking device 30 of this embodiment
Is a retractable seat back 10a which is acted upon by an external force such as a collision.
When the seat is bent and deformed, the first bracket 38 integrally fixed to the retractable seat back 10a is attached to the striker 3
6 and the engaging hole 60 of the first bracket 38.
By inserting the second curved portion 54 of the striker 36 therein, the fall of the retractable seatback 10a is reliably prevented. That is, the first bracket 38 is engaged with the striker 36 separately from the hook member 42 to prevent the retractable seatback 10a from falling down.
As compared with the conventional case in which the upright state is maintained only by engaging the 2 and the striker 36, the fall of the retractable seat back 10a can be prevented more reliably. In particular, the first bracket 38 is the frame 32 of the retractable seatback 10a.
Since it is integrally fixed to the hook member 42, it is possible to easily provide a sufficiently high strength as compared with a movable member such as the hook member 42, while the retractable seat back 10a is flexibly deformed. Since the striker 36 can be engaged with the striker 36, the striker 36 is not normally engaged with the striker 36, and the normal folding operation of the retractable seatback 10a is not hindered.

Further, when the engaging hole 60 is made to face the second curved portion 54, the first curved portion 52 and the second curved portion 54 are moved to the first curved portion.
It is also possible to allow a part of the bracket 38 to be engaged, and in such a case, due to such engagement, further displacement of the retractable seatback 10a, mainly displacement toward the center side in the vehicle width direction. Is suppressed, the load and impact acting on the hook member 42 are reduced, and the hook member 42 is reduced.
Of the lock member 34 and the damage of the lock mechanism 34 including the hook member 42 are suppressed, the hook member 42 and the striker 36 are kept in a good locked state, and the lock mechanism 34 is temporarily locked.
Even if the retractable seat back 10a tries to fall to the front side of the vehicle due to damage to the vehicle, the engaging hole 60 and the second curved portion 5
By the engagement with 4, the fall is surely prevented.

Next, another embodiment of the present invention will be described. In the following embodiments, parts substantially common to the above-mentioned embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

A lock device 70 shown in FIGS. 4 and 5 is an embodiment of the invention described in claim 3, and is used as a lock device for the retractable seat back 10a.
4 is a perspective view with a part omitted, and FIG. 5 is a cross-sectional view. The locking device 70 is the retractable seat back 10a.
A lock mechanism 72 disposed on the frame 32 of the vehicle and a striker 74 fixedly mounted on the vehicle side wall 16a. The lock mechanism 72 is the same as the lock mechanism 72 except that the first bracket 38 is not provided. It has substantially the same configuration as the example lock mechanism 34. The striker 74 includes a locking portion 76 that is substantially parallel to the vehicle width direction and on which the hook member 42 is locked,
While the front end of the locking portion 76 has a front end bent portion 78 that is bent to the front side of the vehicle at an acute angle, the striker 74 is provided on the frame 32 by raising the retractable seat back 10a. An insertion hole 80 into which the tip curved portion 78 is inserted is provided. Then, when the hook member 42 and the striker 74 are locked, the retractable seat back 10a is flexibly deformed so that the center side portion of the retractable seat back 10a in the vehicle width direction is displaced toward the vehicle front side. As shown by the chain double-dashed line in FIG.
When 2 and the like are displaced, the tip bent portion 78 of the striker 74 inserted in the insertion hole 80 is engaged with the frame 32, and further displacement of the retractable seatback 10a (mainly in the vehicle width direction). Displacement toward the center) is suppressed. A portion of the frame 32 where the insertion hole 80 is provided corresponds to an engaging portion, and the frame 32 corresponds to a fall prevention member. A notch 82 is provided in the base bracket 37 so that the tip bent portion 78 can be inserted into the insertion hole 80.

As described above, in the locking device 70 of this embodiment, the tip bending portion 78 of the striker 74 is inserted into the insertion hole 80 of the frame 32 when the retractable seat back 10a is raised. When the foldable seatback 10a is flexibly deformed at the time of a collision or the like, the tip bent portion 78 is engaged with the frame 32, and further displacement of the foldable seatback 10a is suppressed. Thereby, the hook member 4
It is possible to reduce the load and impact acting on the second member, prevent the deformation of the hook member 42, the damage of the lock mechanism 72 including the hook member 42, and the like, and maintain the hook member 42 and the striker 74 in a good locked state. The inversion type seat back 10a is held in an upright state.

That is, also in this embodiment, the frame 32 is engaged with the striker 74 in addition to the hook member 42 to prevent the foldable seatback 10a from falling down, so that the hook member 42 and the striker 74 are separated from each other. As compared with the conventional case in which the foldable seat back 10a is held in the upright state only by engaging, the fall of the retractable seat back 10a can be more reliably prevented. In particular, since the frame 32 originally has high mechanical strength, displacement of the retractable seat back 10a is favorably suppressed by engagement with the striker 74, while the retractable seat back 10a is flexibly deformed. Since it is engaged with the striker 74, it is not normally engaged with the striker 74 and does not interfere with the normal operation of lying down the retractable seatback 10a.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be embodied in other forms.

For example, in the above embodiment, the hook member 42 is arranged to be rotatable about an axis substantially parallel to the vehicle width direction, but the hook member is arranged to be rotatable about a vertical axis. The present invention may be applied to other locking devices as well, such as locking devices.

Further, in the above-mentioned embodiment, the locking devices 30 and 70 of the retractable seat back 10a of the left side seat of the split type retractable seat back 10 have been described, but the present invention is the retractable seat back 10b of the right side seat. Of course, the present invention can be applied to the lock device provided on both sides of the integral type retractable seat back as well.

The striker 74 is used in the second embodiment.
The tip bent portion 78 of the vehicle is only bent toward the front side of the vehicle, but the tip portion thereof is bent further outward in the vehicle width direction, that is, leftward in FIG. When displaced toward the center of
It is also possible to more firmly engage the fall-prevention member integrally fixed to the retractable seat back 10a.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a plan view in which a part of a lock device of a retractable seat back according to an embodiment of the invention is cut away.

2 is a perspective view of the locking device of FIG. 1. FIG.

3 is a perspective view of a fall prevention member and a striker in the lock device of FIG. 1. FIG.

FIG. 4 is a perspective view in which a part of a locking device of a retractable seat back according to an embodiment of the invention described in claim 3 is omitted.

5 is a cross-sectional view of a striker portion of the lock device of FIG.

FIG. 6 is a side view showing an example of a split type retractable seat back in which the locking device of the present invention is preferably used.

FIG. 7 is a plan view of the split type retractable seatback of FIG.

[Explanation of symbols]

 10a, 10b: Retractable seat back 30, 70: Lock device 32: Frame (falling prevention member) 36, 74: Striker 38: First bracket (falling prevention member) 42: Hook member 50: Locking portion 52: No. 1 bend part 54: 2nd bend part 60: Engagement hole 76: Engagement part 78: Tip bend part 80: Insertion hole (engagement part)

Claims (3)

[Claims] 1. A hook member disposed at an upper portion of a side portion of a side wall of a vehicle of the retractable seat back in order to hold the retractable seat back that can be folded forward of the vehicle in an upright state.
A locking device locked with a striker fixed to the vehicle side wall portion, wherein a center side portion in the vehicle width direction of the retractable seatback is a vehicle front side when the hook member and the striker are locked. When the foldable seat back is flexibly deformed so as to be displaced to, it becomes possible to engage with the striker along with the deformation, and the foldable seat back falls down by being directly engaged with the striker. A locking device for a foldable seat back, wherein a fall prevention member for preventing such a situation is integrally fixed to the foldable seat back. 2. The hook member is disposed so as to be rotatable about an axis substantially parallel to the vehicle width direction, and the striker is substantially parallel to the vehicle width direction and the hook member engages. A locking portion to be stopped, a first curved portion bent substantially vertically from the tip of the locking portion, and a second curved portion bent to the rear side of the vehicle from the tip of the first curved portion. The fall prevention member has an engagement hole that can be engaged with the second curved portion of the striker according to the bending deformation of the retractable seatback, and the engagement hole is provided in the engagement hole. The locking device for a folding seatback according to claim 1, wherein the folding of the folding seatback is prevented by inserting the second bending portion. 3. The hook member is disposed so as to be rotatable about an axis substantially parallel to the vehicle width direction, and the striker is substantially parallel to the vehicle width direction and the hook member engages. A locking portion to be stopped, and a tip bending portion bent from the tip of the locking portion toward the front side of the vehicle, wherein the fall prevention member is provided for the bending deformation of the retractable seatback. Accordingly, the hook member and the striker are provided with an engaging portion that is engaged with the tip curved portion, and the engagement with the tip curved portion suppresses further displacement of the retractable seat back. The locking device for a retractable seat back according to claim 1, wherein the locking device maintains a locked state.