JP2000255302A - Seat supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a seat supported by a seat supporting device such as a seat track device and the like from the floor together with the seat supporting device in a state that it is inverted and housed in. SOLUTION: In this device, a supporting mechanism supporting a seat receiving mechanism 10a disposed at the tip end of the seat receiving mechanism such as a seat track 10a and the like, is formed out of a locking mechanism 20a locking the tip end of the seat receiving mechanism 10a with respect to the floor so as to keep the seat in an inverted condition, and of a lock releasing mechanism 20b releasing the locking condition of the seat receiving mechanism 10a with respect to the floor by the locking mechanism 20a. And the seat is so devised that it can be taken out integrally with the seat receiving mechanism 10a in a state that the lock of the seat receiving mechanism 10a with respect to the floor is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat supporting device for supporting a vehicle seat or the like on a floor.

[0002]

2. Description of the Related Art As one type of a sheet supporting apparatus, a sheet receiving mechanism such as a sheet track for supporting a sheet, and a sheet receiving mechanism disposed at a front end of the sheet receiving mechanism and rotating the sheet receiving mechanism with respect to a floor. There is a seat support device of a type including a support mechanism that movably supports and a lock mechanism that is disposed at the rear end of the sheet receiving mechanism and that detachably fixes the sheet receiving mechanism to the floor. .

In this type of sheet supporting device, the fixing of the rear end of the sheet receiving mechanism to the floor by the lock mechanism is released, and the supporting portion of the supporting mechanism that supports the front end of the sheet receiving mechanism is released. It functions so as to be turned upside down and forwardly to the center to store the sheet in an inverted state.

[0004]

In some cases, it is required that a seat supported by a seat supporting device of this type be removed from the floor integrally with the seat supporting device in an inverted storage state. Accordingly, it is an object of the present invention to address such a need.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a seat supporting apparatus, and more particularly, to a sheet receiving mechanism for supporting a sheet, and a sheet receiving mechanism disposed at a front end of the sheet receiving mechanism and mounted on a floor. A supporting mechanism rotatably supported with respect to the sheet receiving mechanism, and a lock mechanism disposed at a rear end of the sheet receiving mechanism to fix the sheet receiving mechanism detachably to a floor. The present invention is applied to a sheet supporting apparatus of a type in which the fixing is released and the sheet is turned upward and forward around the supporting portion of the supporting mechanism and turned upside down.

According to the present invention, there is provided a seat supporting apparatus of the above-mentioned type, wherein the supporting mechanism includes a locking mechanism for locking a front end of the sheet receiving mechanism to a floor and holding the seat in an inverted state. And a lock release mechanism for releasing a lock state of the front end of the sheet receiving member to the floor by the lock mechanism.

In the seat support device according to the present invention, the lock mechanism constituting the support mechanism includes a striker supported in a bridge shape on a bracket erected on the floor, and a rotatable support on the seat receiving mechanism. A release arm, a lock pin provided at a rotating end of the release arm, and a hook connected to the release arm through the lock pin and hooked detachably to the striker, and The hook is movably connected in the longitudinal direction of the sheet receiving mechanism, and is urged forward by a spring member to resiliently contact the lock pin with an outer peripheral cam surface provided on the bracket. When the sheet receiving mechanism is pivoted upward, the lock pin slides on the outer peripheral cam surface of the bracket and drops into an engagement recess provided on the outer peripheral cam surface, and the sheet receiving mechanism is rotated. It can be configured to restrict further rotation.

In the seat support device according to the present invention, the lock release mechanism constituting the support mechanism includes a release handle movably attached to the sheet receiving mechanism in the front-rear direction, and a tip of the release handle. Connecting means for connecting a portion to the hook, and a tension spring interposed between the sheet receiving mechanism and the release handle, and for urging the hook in a direction to be hooked to the striker via the release handle. Configuration.

In these seat supporting devices, a seat track composed of an upper rail for receiving a sheet and a lower rail slidably fitted in the length direction in the upper rail may be employed as the sheet receiving mechanism. it can.

[0010]

In the seat supporting apparatus according to the present invention, a supporting mechanism for supporting the front end of the sheet receiving mechanism is locked to a floor to hold the seat in an inverted state. A lock release mechanism for releasing the locked state of the front end portion of the sheet receiving mechanism to the floor by the lock mechanism is provided. For this reason, when the sheet is in the inverted state, the sheet receiving mechanism can be locked by the lock function of the lock mechanism to maintain the inverted state of the sheet.

Further, when the sheet is in the inverted state, the locked state of the sheet receiving mechanism can be released by the lock release function of the lock release mechanism, and the inverted sheet can be rotated and returned. At the same time, it can be removed from the floor integrally with the sheet receiving mechanism.

In the seat supporting apparatus according to the present invention, the lock mechanism constituting the supporting mechanism is a striker which is supported in a bridge shape on a bracket erected on the floor, and a release which is rotatably supported by the sheet receiving mechanism. An arm, a lock pin provided at a rotation end of the release arm, and a hook connected to the release arm via the lock pin and hooked removably to the striker can be provided.

In this case, the hook is movably connected in the longitudinal direction of the sheet receiving mechanism and is urged forward by a spring member so that the lock pin resiliently contacts the outer peripheral cam surface provided on the bracket. Then, when the sheet receiving mechanism is rotated upward, the lock pin slides on the outer peripheral cam surface of the bracket to drop into the engaging recess provided in the outer peripheral cam surface, and that of the sheet receiving mechanism. The above rotation can be restricted. This allows
The inverted state of the sheet is maintained, and the stored state of the sheet is maintained.

Further, in the seat supporting device according to the present invention, a lock release mechanism constituting the support mechanism is provided on a release handle movably mounted in the sheet receiving mechanism in a front-rear direction, and a hook of the release handle is attached to a tip end of the release handle. And a tension spring interposed between the sheet receiving mechanism and the release handle to urge the hook in the direction of hooking the striker via the release handle.

Thus, when the release handle is operated against the tension spring, the lock pin, which has fallen into the engagement recess on the outer peripheral cam surface of the bracket, is pulled up from the engagement recess, so that the lock pin with respect to the sheet receiving mechanism can be moved. The rotation restriction can be released, and the sheet receiving mechanism can be rotated back to return the sheet. In addition, by operating the release handle against the tension spring, the hook can be released from the hooked state with respect to the striker. In this state, the seat in the inverted state can be removed from the floor integrally with the seat receiving mechanism. Can be.

In the sheet supporting apparatus according to the present invention,
As the sheet receiving mechanism, a seat track including an upper rail for receiving the sheet and a lower rail slidably fitted in the upper rail in the length direction can be adopted. A direction adjustment function can be added.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a seat supporting apparatus according to an example of the present invention. The seat support device includes a seat track 10a, a slide lock mechanism 10b, a first lock mechanism 20a, and a first lock mechanism 2 that releasably lock the front end of the seat track 10a to the floor.
First unlocking mechanism 2 for releasing the locked state due to 0a
0b, a second locking mechanism 30a for releasably locking the rear end of the seat track 10a to the floor side,
It is constituted by a second lock release mechanism 30b for releasing the locked state by the lock mechanism 30a.

The seat support device is constituted by a seat track device, and the seat track 10a constituting the seat support device corresponds to the sheet receiving mechanism of the present invention, and a first lock mechanism constituting the seat support device. 2
The first lock release mechanism 20a and the first lock release mechanism 20b correspond to a support mechanism in the present invention.

The seat track 10a is composed of an upper rail 11, a lower rail 12, and a support means 13, as shown in FIGS. Upper rail 11
Has a fitting groove 11b having a substantially U-shaped cross section that opens upward at the left and right lower ends of a rail body 11a having a gate-shaped cross section. The lower rail 12 includes a pair of left and right plate-like rail members 12a and 12b, and has a fitting protrusion 1 extending downward at left and right side ends of a rail body 12c having a substantially T-shaped cross section.
2d, each fitting protrusion 12 of the lower rail 12
By fitting d and the respective fitting grooves 11b of the upper rail 11, the upper rail 11 is assembled to the lower rail 12 so as to be slidable in its length direction. In this assembled state, the support means 13 is interposed between the upper rail 11 and the lower rail 12 at front and rear portions thereof.

As shown in FIGS. 3 and 7, the support means 13 comprises a roller 13a, a ball 13b, and a guide 13c for supporting the roller 13a. The roller 13a is supported by the guide 13c and the upper rail 11 and the lower rail 13 are supported. 12 are placed between the tops of the balls 12 and each of the left and right balls 1
3b is an upper rail 1 supported by a guide 13c.
1 and the lower rail 12 are interposed therebetween. In this state, the roller 13a moves the upper rail 11 to the lower rail 1
2 and each ball 13b supports the upper rail 11 on the side of the lower rail 11, and the support means 13 functions to ensure a smooth sliding state of the upper rail 11 with respect to the lower rail 12.

In the upper rail 11 constituting the seat track 10a, the cross-sectional shape of the rail main body 11a is a cross-section having a bulging portion bulging on both the inner and outer sides with respect to a square basic cross-sectional shape A shown by a two-dot chain line in FIG. The upper rail 11 is formed to have a longer cross-sectional shape than the basic cross-sectional shape A. The upper rail 11 is formed to have a symmetrical cross-sectional shape with respect to the center in the left and right width directions. As a result, the upper rail 11 has high rigidity in shape, and the lower rail 12
And a high-strength structure to prevent deformation of the fitting portion between the upper rail 11 and the lower rail 12 due to the load from the seat belt, and to prevent the upper rail 11 from being detached from the lower rail 12. I have.

On the other hand, the rail body 12c of the lower rail 12
Is formed by a pair of left and right rail members 12a, 12b. As shown in FIG. 8, the both rail members 12a, 12b have bulging portions whose substantially central portions in the longitudinal direction face each other. And both rail members 12a, 12b
Are joined in a state where both bulging portions are in contact with each other, and are joined by a reinforcement 12h interposed at the distal end. The two rail members 12a, 12 in such a joined state.
In the lower rail 12 constituted by b, all portions except for a joint portion at a front end portion and a center portion between the both rail members 12a and 12b are formed in a housing space portion.

In the seat track 10a, all of the first lock mechanism 20a, the second lock mechanism 30a, and the first lock release mechanism 20b are disposed in the accommodation space, and the second lock release mechanism is provided. A part of 30b is provided. Thereby, the various functional mechanisms 20a, 2
0b, 30a, and 30b, to reduce the size of the seat support device in the height direction and the left and right width directions, and to provide the functional mechanisms 20a and 20b that are disposed between the rail members 12a and 12b.
20b, 30a and 30b, the upper rail 11 and the lower rail 12 can be individually or
Seat track 0a
Has a high strength structure.

In the seat track 10a, each fitting groove 11b of the upper rail 11 is formed close to the rail body 12c of the lower rail 12, and the interval between the rail body 12c of the lower rail 12 and each fitting protrusion 12d is increased. It is formed narrow. As a result, the lower rail 12 has high rigidity, and the upper rail 11
Is formed into a structure having higher strength in cooperation with the high rigidity of the upper rail 11.

The slide lock mechanism 10b includes a lock lever 14, a seat track handle 15, and a torsion spring 1 as shown in FIGS.
The lock lever 14 is integrally mounted on a seat track handle 15, and the seat track handle 15 is supported on the upper rail 11 via a bracket 17. In this state, the seat track handle 15 extends in the front-rear direction along the inside of the upper rail 11, and the torsion spring 16 is fitted on the outer periphery of the rear end.

The torsion spring 16 has one end hooked to the seat track handle 15 and the other end hooked to the upper rail 11, and biases the seat track handle 15 to move the lock lever 14 to the upper rail 11. The lower rail 12 is inserted through one of a plurality of lock holes 12e provided in the front-rear direction through a pair of provided through holes 11c. In this state, the upper rail 1
1 is locked with respect to the lower rail 12 and is prevented from sliding in the front-rear direction. When the seat track handle 15 is rotated against the torsion spring 16, the locked state of the upper rail 11 with respect to the lower rail 12 is released. Sliding in the front-back direction becomes possible. By operating the slide lock mechanism 10b, the position of the vehicle seat supported by the upper rail 11 in the front-rear direction can be adjusted.

The first lock mechanism 20a, together with the first lock release mechanism 20b, constitutes a support mechanism which is a main part of the present invention. The first lock mechanism 20a locks the front end of the seat track 10a with respect to the floor and inverts the seat. While maintaining the state, the locked state of the seat track 10a with respect to the floor is released by the release operation by the first lock release mechanism 20b. The configuration of the first lock mechanism 20a and the first lock release mechanism 20b, and the operation thereof will be described later.

As shown in FIGS. 2, 4, and 11 to 13, the second lock mechanism 30a includes a striker 31, a pair of front and rear hooks 32, 33, a pair of front and rear release arms 34, 35, and a tension spring. 36. The striker 31 is supported in a bridging manner by brackets that are erected on the floor so as to face each other. The first hook 32 and the first release arm 34 on the front side are
As shown in the figure, both rail members 12a of the lower rail 12 are provided.
The second hook 33 and the second hook 33 on the rear side are integrally rotatably supported with the second hook 33 and the second hook 33 interposed therebetween.
As shown in FIG. 13, the release arm 35 is also interposed between the two rail members 12a and 12b of the lower rail 12, and is supported so as to be integrally rotatable. The tension spring 36 is interposed between the first release arm 34 and the second release arm 35.

In the second lock mechanism 30a, the first hook 32 and the first release arm 34 are integrally connected to each other, and the second hook 33 and the second release arm 3 are connected to each other.
5 are connected by inserting a connecting pin 33 a provided on the second hook 33 into an elongated hole 35 a provided on the second release arm 35. Thereby, both hooks 32, 34
Are engaged with each other by being urged by a tension spring 36, and the second hook 33 locks the striker 31 projecting into the recess 12i provided at the lower end of the lower arm 12, and the rear end of the seat track 10a. The part is locked to the floor, and the locked state of the rear end of the seat track 10a with respect to the floor is released by operating the control handle 37 in the second lock release mechanism 30b.

The second lock release mechanism 30b includes a control handle 37 and a tension spring 38, as shown in FIGS. 4, 9, and 10.
The control handle 37 includes a handle portion 37a and an operating arm portion 37b, and a tension spring 38 is interposed between the handle portion 37a and the bracket 17 provided on the upper rail 11. As a result, the control handle 37 is urged in the counterclockwise direction in FIG. 4, and as shown in FIG. 10, the operation arm portion 37 b is inserted into the insertion hole 11 d provided in the upper rail 11 to It is located above between the rail members 12a and 12b.

In the seat supporting apparatus, when the sliding range of the upper rail 11 of the seat track 10a is set and the upper rail 11 is located at the rearmost end, the first release arm constituting the second lock mechanism 30a is provided. 34 is provided on the second lock release mechanism 3.
0b of the control handle 37 of the control handle 37b.

Therefore, in this state, when the control handle 37 is pushed in against the tension spring 38 and rotated clockwise in FIG.
7b are both rail members 12a of the lower rail 12,
12b, and engages with the engagement pin 34a to push the engagement pin 34a, thereby causing the first release arm 34 and the first hook 32 to oppose the tension spring 36 in the counterclockwise direction in FIG. Rotate. As a result, the second release arm 35 and the second hook 33 rotate in the same direction,
The hook 33 releases the hooked state on the striker 31 and releases the locked state on the floor at the rear end of the seat track 10a.

The first lock mechanism 20a constituting the support mechanism of the present invention includes a bracket 21, a striker 22, a release arm 23, a lock pin 24, and a hook 25, as shown in FIGS. ing. The bracket 21 includes a pair of right and left brackets.
Are supported in a cross-linked manner. On the other hand, the release arm 23 is rotatably supported at its upper end by the front end of the lower rail 12 with the release arm 23 interposed between the two rail members 12a and 12b of the lower rail 12. , A lock pin 24 is attached. The lock pin 24 is inserted through an elongated hole 12 f provided in the lower rail 12, and penetrates the rotation base end of the hook 25 to form the lower rail 12.
Is inserted through the other long hole 12f.

The hook 25 has a cam pin 25a and a connecting pin 25b. The cam pin 25a is inserted through a cam hole 12g provided in the lower rail 12 and is connected to the connecting pin 2a.
Reference numeral 5b is connected to a release handle 26 constituting a first lock release mechanism 20b described later. In this state, the hook 25 is urged in the counterclockwise direction in the figure by the release handle 26, and the lock pin 24 resiliently contacts the outer peripheral cam surface 21 a of the bracket 21. An engagement recess 21b is formed at the top of the outer peripheral cam surface 21a of the bracket 21. The lock pin 24 is slidable on the outer peripheral cam surface 21a so as to fall into and engage with the engagement recess 21b, and can be pulled up and detached from the engagement recess 21b by operating the release handle 26.

In the first lock mechanism 20a, when the hook 25 on the lower rail 12 side is hooked on the striker 22 on the floor side, the front end of the seat track 10a is locked on the floor, and the first lock release mechanism 20b By operating the release handle 26, the locked state of the front end of the seat truck 10a with respect to the floor is released.

As shown in FIGS. 1, 3, 6, and 7, the first lock release mechanism 20b
6, fixed handle 27, and tension spring 2
8 is provided. The release handle 26 includes a connecting arm 26a and a handle 26b.
At the front end of a, a recess 26c is formed, and at the rear end, a long hole 26d is formed. The release handle 26 is connected to the lower rail 1 via a pair of front and rear mounting pins 26e and 26f which pass through the elongated hole 26d in a state where the latching recess 26c is fitted to the connecting pin 25b of the hook 25.
Reinforcement 1 which is mounted movably in the front-rear direction with respect to 2 and reinforces between the rail members 12a and 12b constituting the connecting arm portion 26a and the lower rail 12.
2h, and is urged forward by a tension spring 28 interposed therebetween.

As a result, the hook 25 is urged in the counterclockwise direction by the release handle 26, and the lock pin 24 resiliently contacts the outer peripheral cam surface 21a of the bracket 21. In this state, the hook 25 is hooked on the striker 22 provided on the bracket 21, and locks the front end of the seat track 10a to the floor.
In this state, the seat track 10a is
By releasing the locked state by Oa, it is possible to rotate upward and forward about the striker 22 as a rotation center, and thereby the seat supported by the upper rail 11 can be stored in a forward inverted state. . When the seat track 10a rotates forward, the lock pin 24 slides on the outer peripheral cam surface 21a of the bracket 21 to drop into the engagement recess 21b and can be engaged.

FIG. 14 shows the operating state of the first lock mechanism 20a and the first lock release mechanism 20b constituting the support mechanism of the present invention. The lock pin 24 slides the outer peripheral cam surface 21a of the bracket 21 by a predetermined amount. When it moves and reaches the engagement recess 21b, it falls into the engagement recess 21b by the action of the tension spring 28 and resiliently engages with the engagement recess 21b, as shown in FIG. I do. When the lock pin 24 is engaged with the engagement recess 21b of the outer peripheral cam surface 21a, the seat track 10a is further restricted from turning in the front-rear direction, and holds the seat in an inverted state.

In this state, the release handle 26
When the handle portion 26b and the fixed handle 27 are squeezed firmly together, the release handle 26 slides against the tension spring 28, and in the first stage, the
As shown in (b), the release arm 23 is rotated in the counterclockwise direction in the figure to pull up the lock pin 24 from the engagement recess 21b and to separate it. Thereby, the seat track 10a can be returned by rotating clockwise in the figure.

Further, in the second stage of sliding the release handle 26 against the tension spring 28, as shown in FIG. 14C, the hook 25 is moved to the illustrated timepiece by the action of the cam hole 12g and the cam pin 25a. By rotating, the hook 25 is released from the hooked state on the striker 21. Thereby, the seat in the inverted storage state can be removed from the floor integrally with the seat track 10a.

As described above, in the seat supporting apparatus, the first locking mechanism 20a that locks the support mechanism for supporting the front end of the seat track 10a with respect to the floor and holds the seat in an inverted state is provided. A structure is provided with a first lock release mechanism 20b that releases the locked state of the front end of the seat track 10a to the floor by the lock mechanism 20a. Therefore, when the seat is in the inverted state, the seat track 10a can be locked by the locking function of the first lock mechanism 20a to maintain the seat in the inverted state.

When the sheet is in the inverted state, the first
With the unlocking function of the unlocking mechanism 20b, the locked state of the seat track 10a by the first locking mechanism 20a can be released, and the seat in the inverted state can be rotated and returned. Can be removed.

In the above-described embodiment, an example has been described in which the seat supporting device is a seat track device which employs a seat track as a sheet receiving mechanism and enables position adjustment in the front-rear direction of the seat. In the present invention, a non-slidable receiving mechanism for receiving a sheet instead of a seat track and supporting the sheet on a floor is adopted, and the present invention is also applied to a seat supporting apparatus in which the position of the sheet in the front-rear direction cannot be adjusted. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view of a sheet support device according to an example of the present invention.

FIG. 2 is a side view of the sheet supporting device.

FIG. 3 is a side view showing a front side of a seat track constituting the seat supporting device.

FIG. 4 is a side view showing a rear portion of the seat track.

FIG. 5 is a cross-sectional view taken along a line 5-5 in FIG. 2;

FIG. 6 is a cross-sectional view taken along a line 6-6 in FIG. 2;

FIG. 7 is a cross-sectional view taken along a line 7-7 in FIG. 2;

FIG. 8 is a cross-sectional view taken along a line 8-8 in FIG. 2;

FIG. 9 is a cross-sectional view along the line 9-9 in FIG. 2;

FIG. 10 is a cross-sectional view taken along a line 10-10 in FIG. 2;

FIG. 11 is a cross-sectional view taken along a line 11-11 in FIG. 2;

FIG. 12 is a cross-sectional view taken along a line 12-12 in FIG. 2;

FIG. 13 is a cross-sectional view taken along a line 13-13 in FIG. 2;

FIGS. 14A to 14C are operation state explanatory views illustrating operation states of a first lock mechanism and a first lock release mechanism that constitute a support mechanism.

[Explanation of symbols]

10a: seat track, 11: upper rail 11, 1
1a: Rail body, 11b: Fitting groove, 11c: Through hole,
11d: insertion hole, 12: lower rail, 12a, 12b ...
Rail member, 12c: Rail body, 12d: Fitting protrusion,
12e: lock hole, 12f: long hole, 12g: cam hole, 1
2h: reinforcement, 12i: recess, 13: support means, 13a: roller, 13b: ball, 13c: guide, 10b: slide lock mechanism, 14: lock lever, 15: seat track handle, 16: torsion spring, 17 bracket, 20a first lock mechanism, 21 bracket, 21a outer peripheral cam surface, 21b
Engagement recess, 22 ... striker, 23 ... release arm,
24: lock pin, 25: hook, 25a: cam pin,
25b: connecting pin, 20b: first unlocking mechanism, 26
... Release handle, 26a ... Connecting arm, 26b ...
Handle part, 26c: locking recess, 26d: long hole, 26
e, 26f: mounting pin, 27: fixed handle, 28: tension spring, 30a: second lock mechanism, 31:
Striker, 32, 33 ... hook, 33a ... connecting pin,
34, 35: release arm, 34a: engagement pin, 35
a: long hole, 36: tension spring, 30b: second
Lock release mechanism, 37 ... Control handle, 37a
... handle part, 37b ... operating arm part, 38 ... tension spring.

Claims (4)

[Claims] 1. A sheet receiving mechanism for supporting a sheet, a supporting mechanism disposed at a front end of the sheet receiving mechanism and rotatably supporting the sheet receiving mechanism with respect to a floor; A lock mechanism is provided at a rear end portion of the receiving mechanism to fix the sheet receiving mechanism detachably to the floor,
In a sheet supporting apparatus which releases the fixing by the lock mechanism and turns the seat upward and forward around the supporting portion of the supporting mechanism and inverts the seat, the supporting mechanism may be configured to remove a front end of the sheet receiving mechanism. A seat support, comprising: a lock mechanism that locks the floor to maintain the inverted state of the seat; and a lock release mechanism that releases the locked state of the seat receiving mechanism to the floor by the lock mechanism. apparatus. 2. The seat supporting device according to claim 1, wherein the lock mechanism constituting the support mechanism includes a striker supported in a bridge shape on a bracket erected on a floor, and a rotation mechanism mounted on the seat receiving mechanism. A release arm movably supported, a lock pin provided at a rotation end of the release arm, and a hook connected to the release arm via the lock pin and detachably hooked to the striker; The hook is movably connected in the longitudinal direction of the sheet receiving mechanism and is urged forward by a spring member to resiliently contact the lock pin with an outer peripheral cam surface provided on the bracket. When the sheet receiving mechanism is pivoted upward, the lock pin slides on the outer peripheral cam surface of the bracket and falls into an engagement recess provided on the outer peripheral cam surface, and It Sheet support apparatus characterized by restricting the rotation of the upper. 3. The seat support device according to claim 2, wherein the lock release mechanism that constitutes the support mechanism is a release handle that is movably attached to the sheet receiving mechanism in the front-rear direction. Connecting means for connecting the distal end of the hook to the hook; and a tension spring interposed between the sheet receiving mechanism and the release handle, and for urging the hook in a direction to hook the striker via the release handle. A sheet support device comprising: 4. A seat supporting apparatus according to claim 1, wherein said sheet receiving mechanism includes an upper rail for receiving a sheet, and a lower rail slidably fitted to said upper rail in a longitudinal direction. A seat support device characterized by employing a seat track comprising: