Accessory member adjustment mechanism and vehicle seat

Abstract

To provide an accessory member adjusting mechanism and a vehicle seat capable of adjusting the position of an accessory member in multiple directions with a simple constitution.SOLUTION: An armrest 10 includes a bearing member 20. The bearing member 20 is provided with bearing holes 26, 28 and 30, the bearing hole 26 can support a rotary shaft 18 in the circumferential direction, and the bearing hole 28 can support the rotary shaft 18 in the circumferential and axial directions. Meanwhile, the bearing hole 30 can support a shaft 14 in the circumferential and axial directions. An armrest body 12 is developed by rotating the bearing hole 28 along the circumferential direction of the rotary shaft 18, and the armrest body 12 can be inclined inward in the seat width direction by rotating the shaft 14 along the circumferential direction with respect to the bearing hole 30 in the developed state. The armrest body 12 can be moved along the seat front-rear direction by moving the shaft 14 relative to the bearing hole 30 along the axial direction of the shaft.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an accessory member adjustment mechanism and a vehicle seat. [Background technology]

[0002] For example, the following Patent Document 1 discloses a technology related to an armrest provided on the side of a vehicle seat. In this prior art, when the vehicle is autonomously driven, the armrest is moved to a position that is easy for the occupant to use, and when the vehicle is not autonomously driven, the armrest is moved to a position that is not in the way of the occupant. In this way, the prior art is provided with a mechanism for adjusting the armrest in multiple directions, such as by rotating or moving it forward and backward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6368959 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned prior art, a motor is used to adjust the position of the armrest (accessory member) in multiple directions, which raises concerns about increased weight and cost, as well as reduced operability due to slow operating speed.

[0005] SUMMARY OF THE PRESENT DISCLOSURE In consideration of the above, an object of the present invention is to provide an accessory member adjustment mechanism and a vehicle seat that are capable of adjusting the position of an accessory member in multiple directions with a simple configuration. [Means for solving the problem]

[0006] The accessory member adjustment mechanism of the first aspect includes an accessory member that is deployable and usable in the deployed state, a rotating shaft that is provided on the seat side and arranged along the seat width direction, a shaft that is provided on the accessory member side and intersects with the rotating shaft and is arranged along the seat front-rear direction when the accessory member is deployed, and a bearing member that is provided with a first bearing portion that can be supported circumferentially relative to the rotating shaft, and a second bearing portion that can be supported circumferentially and axially relative to the shaft that is arranged intersecting the rotating shaft.

[0007] The accessory adjustment mechanism according to the first aspect includes an accessory, a rotating shaft, a shaft, and a bearing member. The accessory is provided so as to be deployable and can be used in the deployed state. In other words, when the accessory is not in use, the accessory can be stored in a predetermined position.

[0008] The rotating shaft is provided on the seat side and is arranged along the seat width direction. The shaft is provided on the accessory member side so as to intersect with the rotating shaft and is arranged along the seat front-rear direction when the accessory member is deployed. The bearing member is provided with a first bearing portion and a second bearing portion, and the first bearing portion is capable of being supported in the circumferential direction relative to the rotating shaft. Meanwhile, the second bearing portion is capable of being supported in the circumferential direction and the axial direction relative to the shaft arranged so as to intersect with the rotating shaft.

[0009] In this embodiment, for example, in the case where the accessory member is an armrest provided on the side of the seat, the armrest can be deployed from a state in which the armrest is arranged along the vertical direction of the seat (a so-called stored state) by rotating the first bearing portion of the bearing member along the circumferential direction of the rotation shaft. In this state, the armrest can be used.

[0010] With the armrest deployed, the armrest can be tilted inward in the seat width direction by rotating the shaft in its circumferential direction relative to the second bearing portion of the bearing member. Furthermore, the armrest can be moved in the seat front-rear direction by moving the shaft in its axial direction relative to the second bearing portion. In other words, in this embodiment, the position of the armrest can be adjusted in multiple directions.

[0011] In addition, examples of the deployable accessory include a table in addition to an armrest. The seat side on which the rotation shaft is provided may be the seat back side, the seat cushion side, or the door trim side.

[0012] The accessory component adjustment mechanism of the second aspect is the accessory component adjustment mechanism of the first aspect, wherein the bearing member includes a first support member arranged along the axial direction of the rotating shaft and constituting a part of the second bearing portion, and a second support member that is movable toward and away from the first support member along the axial direction of the rotating shaft, constitutes the other part of the second bearing portion, and clamps and fixes the shaft via the second bearing portion while abutting against the first support member along the axial direction of the rotating shaft.

[0013] In the accessory adjustment mechanism according to the second aspect, the bearing member includes a first support member and a second support member. The first support member is disposed along the axial direction of the rotating shaft and constitutes a part of the second bearing portion.

[0014] On the other hand, the second support member is capable of moving toward and away from the first support member along the axial direction of the rotating shaft, constitutes the other part of the second bearing portion, and cooperates with the first support member to clamp and fix the shaft while abutting against the first support member along the axial direction of the rotating shaft.

[0015] In other words, in this embodiment, when the second support member moves away from the first support member along the axial direction of the rotating shaft, the clamped state of the shaft is released, and the shaft becomes rotatable in the circumferential direction and movable in the axial direction.

[0016] The accessory component adjustment mechanism of the third aspect is the accessory component adjustment mechanism of the first or second aspect, wherein the bearing member is provided on the second support member and is capable of being opened and closed, and further includes a first lever that, when closed, clamps and fixes the rotating shaft by the first bearing portion and, when open, releases the clamped state of the rotating shaft.

[0017] In the accessory member adjustment mechanism according to the third aspect, the bearing member further includes a first lever. The first lever is provided on the second support member and is openable and closable. When the first lever is closed, the rotating shaft is clamped and fixed by the first bearing portion.

[0018] On the other hand, when the first lever is released, the clamped state of the rotating shaft is released, the first bearing portion rotates relative to the rotating shaft, and the bearing members (first support member and second support member) can be rotated circumferentially of the rotating shaft via the first bearing portion.

[0019] The accessory component adjustment mechanism of the fourth aspect is the accessory component adjustment mechanism of any one of the first to third aspects, wherein the bearing member further includes a stopper provided at the tip of the rotating shaft, against which the second support member abuts to prevent the second support member from coming off, and a second lever provided on the second support member and capable of being opened and closed, in a closed state an insertion portion is inserted into a gap provided between the stopper and the second support member to abut the second support member against the first support member, the shaft is clamped and fixed by the second bearing portion, and in an open state the clamped state of the shaft is released.

[0020] In the accessory adjustment mechanism according to the fourth aspect, the bearing member further includes a stopper and a second lever. The stopper is provided at the tip of the rotating shaft and the second support member abuts against the stopper to prevent the second support member from coming off.

[0021] On the other hand, the second lever is provided on the second support member. The second lever can be opened and closed, and when the second lever is closed, the insertion portion is inserted into a gap provided between the stopper and the second support member. As a result, the second support member abuts against the first support member, and the shaft is clamped and fixed by the second bearing portion.

[0022] When the second lever is released, the insertion portion provided between the stopper and the second support member is disengaged, and the clamped state of the shaft is released, allowing the shaft to rotate in the circumferential direction relative to the second bearing portion and to move in the axial direction.

[0023] In the vehicle seat of the fifth aspect, the accessory member of any one of the first to fourth aspects is an armrest, and the accessory member adjustment mechanism of any one of the first to fourth aspects is provided on the side of the seat back.

[0024] In the vehicle seat according to the fifth aspect, it is possible to enjoy the effects obtained by the accessory member adjusting mechanism according to any one of the first to fourth aspects. Effect of the Invention

[0025] As described above, according to the accessory member adjustment mechanism and the vehicle seat of the present invention, the position of the accessory member can be adjusted in multiple directions with a simple configuration. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a perspective view showing the armrest according to the present embodiment in an unfolded state, as viewed from diagonally forward left side. [Diagram 2]FIG. 2 is an exploded perspective view showing the configuration of an armrest according to the present embodiment. [Diagram 3] 2A is a perspective view of a bearing member constituting a part of the armrest shown in FIG. 1, as viewed from the diagonally front left side, and FIG. 2B is a perspective view of the bearing member as viewed from the diagonally rear left side. [Figure 4] 2A is a front view of a bearing member constituting part of the armrest shown in FIG. 1, as viewed from the front side, and FIG. 2B is a cross-sectional view taken along line AA shown in FIG. [Diagram 5] 2A is a perspective view of a bearing member constituting part of the armrest shown in FIG. 1, as viewed from the left front side, and FIG. 2B is a perspective view corresponding to (A), showing a state in which a first lever provided on the bearing member is released. [Figure 6] 2A is a perspective view of a bearing member constituting part of the armrest shown in FIG. 1, as viewed from the left front side, and FIG. 2B is a perspective view corresponding to (A), showing a state in which a second lever provided on the bearing member is released. [Figure 7] 2A is a front view showing a state in which a second support member of a bearing member constituting part of the armrest shown in FIG. 1 is separated from a first support member, and FIG. 2B is a front view showing a state in which the second support member is abutted against the first support member. [Figure 8] FIG. 13(A) is a perspective view of the bearing member when viewed diagonally from the front left side in a state in which the first lever is released, and FIG. 13(B) is a perspective view for explaining the function of the armrest. [Figure 9] FIG. 13(A) is a perspective view of the bearing member when the second lever is released, as viewed from the diagonally front left side, and FIG. 13(B) is a perspective view for explaining the function of the armrest. [Figure 10] FIG. 13(A) is a perspective view of the bearing member when the second lever is released, as viewed from the diagonally front left side, and FIG. 13(B) is a perspective view for explaining the function of the armrest. [Figure 11] FIG. 13(A) is a perspective view of the bearing member when the second lever is released, as viewed from the diagonally front left side, and FIG. 13(B) is a perspective view for explaining the function of the armrest. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. For convenience of explanation, the arrow UP shown in each drawing indicates the seat upper direction, the arrow FR indicates the seat front direction, and the arrow RH indicates the seat right direction. Therefore, in the following description, when the up / down, front / rear, and left / right directions are described without special mention, they refer to the up / down, front / rear, and left / right directions of the vehicle seat, although they are not shown in the drawings. The left / right direction is also synonymous with the seat width direction.

[0028] (Configuration of accessory adjustment mechanism) First, the configuration of an armrest 10 to which the accessory member adjusting mechanism according to the present embodiment is applied will be described.

[0029] 1 is provided, for example, on the side of a seat back of a vehicle seat (not shown). In a plan view, the armrest body (accessory member) 12 has a generally rectangular plate shape with the longitudinal direction being the front-rear direction of the seat, and is capable of supporting the hands, elbows, etc. of an occupant seated in the vehicle seat.

[0030] A shaft 14 is provided in the center of the width of the armrest main body 12 at the rear end of the armrest main body 12, and the shaft 14 extends along the vertical direction of the seat at the side of the seat back when the armrest main body 12 is in the stored state, and extends along the fore-aft direction of the seat when the armrest main body 12 is in the unfolded state.

[0031] Here, a support plate 16 having a rectangular shape with its longitudinal direction extending in the vertical direction of the seat in a side view of the seat is provided on a side portion of the seat back (not shown). As shown in Fig. 2, a rotating shaft 18 extends from the center of the support plate 16 along the seat width direction. In other words, the rotating shaft 18 and the shaft 14 are provided in a state where they are substantially perpendicular (intersecting). The rotating shaft 18 is provided with a support member (first support member) 22 and a support member 24 (second support member) that can support the shaft 14 as a bearing member 20.

[0032] The support members 22 and 24 are generally rectangular parallelepipeds with the seat vertical direction as the longitudinal direction. Bearing holes (first bearing parts) 26 and 28 are provided on the upper parts 22A and 24A of the support members 22 and 24, respectively, into which the rotating shaft 18 can be inserted. In addition, a bearing hole (second bearing part) 30 formed between the support members 22 and 24 is provided on the lower parts 22B and 24B of the support members 22 and 24.

[0033] To explain the bearing hole 30 in more detail, a portion 30A of the bearing hole 30 is formed in the support member 22, and the other portion 30B of the bearing hole 30 is formed in the support member 24. As shown in Fig. 4(A) , the support member 22 and the support member 24 abut against each other, so that the portion 30A and the other portion 30B of the bearing hole 30 become one body to form the bearing hole 30. The shaft 14 is supported by the bearing hole 30 so as to be rotatable along its circumferential direction.

[0034] 2 are disposed along the axis P of the rotating shaft 18 with the rotating shaft 18 inserted into the bearing holes 26, 28, and are supported rotatably around the circumferential direction of the rotating shaft 18. A disk-shaped stopper 32 having a diameter larger than the outer diameter of the rotating shaft 18 is provided at the tip of the rotating shaft 18, as shown in FIG.

[0035] 7(A) and (B), the support member 22 is disposed on the support plate 16 side, and the support member 24 is capable of moving toward and away from the support member 22. The support member 24 is also capable of coming into contact with a stopper 32, and is prevented from coming off by the stopper 32. For ease of explanation, a lock lever (first lever) 34 and a lock lever (second lever) 36, which will be described later, are not shown in FIGS. 7(A) and (B).

[0036] 2, the corners of the upper surfaces of the support members 22, 24 are rounded in an arc shape along the seat front-rear direction. On the upper surface of the support member 24, lock levers 34 and 36 are provided along the axis P of the bearing hole 28 so as to be able to open and close, as shown in Figures 5(A), (B), 6(A), and (B). The lock lever 34 is provided on the support member 22 side, and the lock lever 36 is provided on the stopper 32 side.

[0037] 4(B), slits 38, 40 that open in the vertical direction and divide the bearing hole 28 into upper and lower portions are provided at the front and rear portions of the support member 24. Here, the lock levers 34, 36 are each provided with an eccentric cam (not shown) that presses the upper surface of the support member 24, and the eccentric cam is formed so that the distance from the center of rotation is greater when the lock levers 34, 36 are in the closed state than when they are in the open state.

[0038] Therefore, when the lock levers 34, 36 are closed, the upper portion 24A of the support member 24 is pressed toward the lower portion 24B via the eccentric cam. This narrows the distance between the slit portions 38, 40. That is, when the lock lever 34 is closed, the distance between the slit portion 40 narrows, and when the lock lever 36 (described later) is closed, the distance between the slit portion 38 narrows. When the distance between the slit portions 38, 40 narrows in this manner, the diameter of the bearing hole 28 becomes smaller, and the rotating shaft 18 is clamped via the bearing hole 28, and as a result, the support member 24 is fixed to the rotating shaft 18.

[0039] On the other hand, as shown in Figures 8(A) and (B), when the lock lever 34 is in the open state, the interval between the slit portions 38 becomes wider, and as shown in Figures 9(A) and (B), when the lock lever 36 is in the open state, the interval between the slit portions 40 becomes wider. In this way, the bearing hole 28 becomes larger in diameter when at least the lock lever 34 or the lock lever 36 is opened, so that the clamping force of the bearing hole 28 on the rotating shaft 18 becomes lower, and the support members 22, 24 are allowed to rotate in the circumferential direction of the rotating shaft 18.

[0040] Here, a rib (insertion portion) 42 (see FIG. 7(A)) that can be inserted between the support member 24 and the stopper 32 hangs down from the lock lever 36. As shown in FIGS. 7(A) and (B), the support member 24 is provided so as to be able to move toward and away from the support member 22. The rib 42 is formed so as to have a thickness equivalent to a gap 44 that is provided between the support member 24 and the stopper 32 in a state in which the support member 24 abuts against the support member 22. In other words, the support member 24 abuts against the support member 22 by inserting the rib 42 between the support member 24 and the stopper 32.

[0041] Meanwhile, as described above, the bearing hole 30 formed between the support member 22 and the support member 24 is provided on the lower portion 22B, 24B side of the support members 22, 24. The shaft 14 can be inserted into the bearing hole 30, and the shaft 14 can be fixed in a state in which the support member 22 and the support member 24 are in contact with each other.

[0042] For this reason, when the support members 22 and 24 are not in contact with each other, that is, when the support member 24 is separated from the support member 22, a gap is formed between the part 30A and the other part 30B of the bearing hole 30. This increases the diameter of the bearing hole 30, reduces the clamping force applied to the shaft 14 by the bearing hole 30, and allows the shaft 14 to move in the circumferential and axial directions.

[0043] (Action and effect of accessory adjustment mechanism) Next, the operation and effect of the armrest to which the accessory member adjustment mechanism according to this embodiment is applied will be described.

[0044] 1 and 2, the armrest 10 includes an armrest main body 12, a rotating shaft 18, a shaft 14, and a bearing member 20. The armrest main body 12 is provided so as to be unfoldable, and can be used in the unfolded state.

[0045] Although not shown, the rotating shaft 18 is provided on the seat side and is arranged along the seat width direction. The shaft 14 is provided on the armrest body 12 side, substantially perpendicular to the rotating shaft 18. The bearing member 20 is provided with bearing holes 26, 28 as a first bearing portion and a bearing hole 30 as a second bearing portion, and the bearing hole 26 is capable of supporting the rotating shaft 18 in the circumferential direction, and the bearing hole 28 is capable of supporting the rotating shaft 18 in the circumferential direction and the axial direction. On the other hand, the bearing hole 30 is capable of supporting the shaft 14 in the circumferential direction and the axial direction.

[0046] With the above-mentioned configuration, in this embodiment, for example, as shown in Figures 2, 8(B), and 9(B), the armrest main body 12 is moved from a stored state in which it is arranged along the vertical direction of the seat relative to the side surface of the seat back (not shown) to the deployed state as shown in Figure 1 by rotating the bearing hole 28 of the bearing member 20 along the circumferential direction of the rotation shaft 18. In this manner, the armrest main body 12 is usable in the deployed state. As described above, in this embodiment, the deployment angle of the armrest main body 12 is adjustable.

[0047] 2 and 11(B), when the armrest body 12 is unfolded, the armrest body 12 can be tilted inward in the seat width direction by rotating the shaft 14 in the circumferential direction relative to the bearing hole 30 of the bearing member 20. That is, in this embodiment, the roll angle of the armrest body 12 can be adjusted.

[0048] Furthermore, when the armrest main body 12 is unfolded, the armrest main body 12 can be moved in the fore-and-aft direction of the seat by moving the shaft 14 along its axial direction relative to the bearing hole 30 of the bearing member 20, as shown in Figures 2 and 10(B).

[0049] As described above, in this embodiment, the position of the armrest main body 12 can be manually adjusted in multiple directions with a simple configuration. In this way, making the position of the armrest main body 12 manually adjustable in multiple directions is advantageous in terms of weight, cost, and operability compared to automatic adjustment using a motor or the like.

[0050] To specifically explain the above-mentioned action, in this embodiment, as shown in Fig. 2, the bearing member 20 is configured to include a support member 22 and a support member 24. The support members 22, 24 are arranged along the direction of the axis P of the rotating shaft 18, and the support member 24 is capable of approaching and separating from the support member 22 along the direction of the axis P of the rotating shaft 18. In this embodiment, a stopper 32 is provided at the tip of the rotating shaft 18 to prevent the support member 24 from coming off.

[0051] Furthermore, a portion 30A of a bearing hole 30 that supports the shaft 14 is formed in the support member 22. Meanwhile, the other portion 30B of the bearing hole 30 is formed in the support member 24, and when the support member 24 abuts against the support member 22 along the direction of the axis P of the rotating shaft 18, the portion 30A and the other portion 30B of the bearing hole 30 are integrated to form the bearing hole 30, and the support member 24 cooperates with the support member 22 to clamp and fix the shaft 14.

[0052] In addition, in this embodiment, as shown in Figures 2, 3(A), and (B), the support member 24 is provided with lock levers 34, 36, which can be opened and closed, and when the lock levers 34, 36 are closed, the rotating shaft 18 is clamped and fixed.

[0053] When the lock lever 36 is closed, as shown in Figures 7(A) and (B), the rib 42 is inserted into the gap 44 provided between the stopper 32 and the support member 24. As a result, the support member 24 comes into contact with the support member 22, and the shaft 14 is clamped and fixed by the bearing hole 30.

[0054] With the above-described configuration, when the armrest body 12 is stored on the side of the seat back, by releasing the lock lever 34 or the lock lever 36 as shown in Figures 8(A), (B), 9(A), and (B), the spacing between the slit portions 38 or the slit portions 40 becomes wider, so that the clamping force that clamps the rotating shaft 18 decreases, and the clamped state of the rotating shaft 18 can be released.

[0055] This allows the bearing hole 28 to rotate relative to the rotating shaft 18, and the bearing member 20 (support member 22 and support member 24) can be rotated circumferentially around the rotating shaft 18 via the bearing hole 28. In this way, when the armrest body 12 is unfolded as shown in Figure 1, the armrest body 12 is ready for use. In this state, the lock levers 34, 36 are closed to fix the rotating shaft 18.

[0056] On the other hand, when the armrest main body 12 is unfolded and the lock lever 36 is released, as shown in Figure 7 (A), the rib 42 provided between the stopper 32 and the support member 24 comes out of the gap 44, allowing the support member 24 to be separated from the support member 22.

[0057] When support member 24 is moved away from support member 22, a gap is formed between part 30A and other part 30B of bearing hole 30, the bearing hole 30 becomes larger in diameter, the clamping force applied to shaft 14 by bearing hole 30 is reduced, and the shaft 14 can move circumferentially and axially.

[0058] 11(A) and (B), the armrest body 12 can be tilted inward in the seat width direction by moving the shaft 14 in the circumferential direction through the bearing hole 30. As a result, in this embodiment, the armrest body 12 can stably support the hand when looking at a smartphone or the like held in the hand, thereby reducing hand fatigue.

[0059] 10(A) and (B), the armrest body 12 can be moved in the front-rear direction of the seat by moving the shaft 14 in the axial direction through the bearing hole 30. This allows the position of the hand or elbow in the front-rear direction of the armrest body 12 to be adjusted in this embodiment.

[0060] As described above, the armrest 10 of the vehicle seat according to this embodiment has been described based on the drawings, but the armrest 10 of the vehicle seat according to this embodiment is not limited to the one shown in the drawings, and can be appropriately modified in design within the scope of the gist of the present invention. In the above embodiment, the armrest 10 has been described as an accessory member, but is not limited to this. For example, although not shown, it may be applied to a table provided on the vehicle seat. [Explanation of symbols]

[0061] 10 Armrest (accessory) 12 Armrest body (accessory part) 14 Shaft 18 Rotational Axis 20 Bearing materials 22 Support member (first support member, bearing member) 24 Support member (second support member, bearing member) 26 Bearing hole (1st bearing part) 28 Bearing hole (1st bearing part) 30 Bearing hole (2nd bearing part) 32 Stopper 34 Lock lever (first lever) 36 Lock lever (second lever) 42 Rib (insertion part) 44 Gap P axis (axis of rotation)

Claims

1. An accessory member that is provided in a deployable manner and can be used in a deployed state; A rotation shaft provided on the seat side and arranged along the seat width direction; a shaft that is provided on the accessory member side so as to intersect with the rotation axis and that is disposed along the front-rear direction of the seat when the accessory member is deployed; a bearing member provided with a first bearing portion capable of supporting the rotating shaft in a circumferential direction and a second bearing portion capable of supporting the shaft in a circumferential direction and an axial direction; An accessory adjustment mechanism comprising:

2. The bearing member is A first support member that is disposed along the axial direction of the rotating shaft and that constitutes a part of the second bearing portion; a second support member that is movable toward and away from the first support member along the axial direction of the rotating shaft, that constitutes the other part of the second bearing portion, and that cooperates with the first support member to clamp and fix the shaft in a state of contact with the first support member along the axial direction of the rotating shaft; The accessory adjustment mechanism according to claim 1 , further comprising:

3. The bearing member is 3. The accessory adjustment mechanism as described in claim 2, further comprising a first lever that is provided on the second support member, is openable and closable, and when closed, clamps and fixes the rotating shaft by the first bearing portion, and when open, releases the clamped state of the rotating shaft.

4. The bearing member is a stopper provided at a tip of the rotating shaft, the stopper being brought into contact with the second support member to prevent the second support member from coming off; a second lever that is provided on the second support member and can be opened and closed, and in a closed state, an insertion portion is inserted into a gap provided between the stopper and the second support member to bring the second support member into contact with the first support member, and the shaft is clamped and fixed by the second bearing portion, and in an open state, releases the clamped state of the shaft; 3. The accessory adjustment mechanism according to claim 2, further comprising:

5. The accessory member according to any one of claims 1 to 4 is an armrest, The accessory member adjusting mechanism according to any one of claims 1 to 4 is provided in a side portion of a seat back of a vehicle seat.

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