Vehicle seats

Abstract

To provide a vehicle seat designed such that a lock member is less likely to unexpectedly move to an unlock position for allowing rotation of a link member even when an urging force for rotating the lock member to a lock position for restricting the rotation of the link member is not large.SOLUTION: A vehicle seat includes: a lock member 50 rotatable between a lock position at which rotation of a link member is restricted by engaging with a sector gear provided on the link member urged in a direction of raising a seat cushion frame and an unlock position separated from the sector gear; an urging member 72 that generates an urging force F1 for moving the lock member to the lock position; a power transmission member 60; and a linkage mechanism 68 that links the lock member and the power transmission member and, when an operation force inclined with respect to a tangent line TG of a rotation locus RT of the lock member and resisting the urging force is applied to the power transmission member and the operation force is equal to or larger than a predetermined value, transmits the operation force to the lock member so that the lock member is moved to the unlock position.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] Patent Document 1 below discloses a vehicle seat having a lifter mechanism that moves a seat cushion up and down relative to the vehicle floor. This vehicle seat includes a support member supported on the vehicle floor, a seat cushion frame that is part of the seat cushion and is located above the support member, and a link member rotatably connected to the support member and the seat cushion frame. The link member rotates to raise and lower the seat cushion frame relative to the support member. The vehicle seat also includes a spring member that rotationally biases the link member so as to lift the seat cushion frame relative to the support member. Furthermore, the link member is formed with a sector gear.

[0003] The vehicle seat further includes a locking member supported by the seat cushion and a spring member that rotationally biases the locking member. The locking member is rotatable between a locked position where it engages with the sector gear to restrict rotation of the link member and an unlocked position where it is separated from the sector gear. The spring member rotationally biases the locking member toward the locked position.

[0004] The vehicle seat further includes an operating member linked to the locking member. When the vehicle occupant does not apply an operating force (external force) to the operating member, the locking member is located in the locked position. Therefore, the height of the seat cushion is maintained. When the occupant applies an operating force to the operating member, the locking member moves to the unlocked position against the biasing force of the spring member. Therefore, the link member becomes rotatable, allowing the seat cushion to be raised or lowered. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2020 / 010202 Summary of the Invention [Problem to be solved by the invention]

[0006] In the vehicle seat of Patent Document 1, if the biasing force of the spring member is not large, there is a risk that the locking member will move from the locked position to the unlocked position when a small operating force is suddenly applied to the operating member. Therefore, the vehicle seat of Patent Document 1 needs to be equipped with a spring member with a large biasing force.

[0007] Taking the above facts into consideration, the present invention aims to provide a vehicle seat in which there is little risk of the locking member accidentally moving to an unlocked position that allows rotation of the link member, even if the biasing force that rotates the locking member to a locked position that restricts rotation of the link member is not large. [Means for solving the problem]

[0008] The vehicle seat according to claim 1 includes a support member supported on a vehicle body floor, a seat cushion frame that is part of a seat cushion and that can be raised and lowered relative to the support member, a link member that is rotatably connected to the support member and the seat cushion frame and that rotates to raise and lower the seat cushion frame relative to the support member and is biased in a direction to raise the seat cushion frame, a sector gear provided on the link member, and a lock position locking mechanism that is supported on the seat cushion and engages with the sector gear from the front side of the vehicle to restrict rotation of the link member. a locking member rotatable between a locked position and an unlocked position away from the sector gear toward the front of the vehicle; an urging member that generates an urging force that moves the locking member to the locked position; a power transmission member rotatably supported on the seat cushion; and a linking mechanism that links the locking member and the power transmission member, and that transmits an operating force to the locking member when an operating force is applied to the power transmission member in a direction toward the front of the vehicle that is inclined with respect to a tangent to a rotational locus of the locking member and resists the urging force, and when the operating force has a magnitude equal to or greater than a predetermined value, the locking member moves toward the unlocked position. the linking mechanism includes a power transmission pin provided on one of the locking member and the power transmission member, and an elongated hole provided on the other of the locking member and the power transmission member, into which the power transmission pin is inserted; when the locking member rotates between the locked position and the unlocked position, the power transmission pin moves within the elongated hole, and one of the power transmission pin and an inner surface of the elongated hole provided on the power transmission member transmits the operating force to the other of the power transmission pin and the inner surface of the elongated hole provided on the locking member; the locking member is located on one side in the seat width direction of a side frame constituting a side portion of the seat cushion frame, and the power transmission member is located on the other side in the seat width direction of the side frame; the biasing member and an operating force transmission member to which the operating force is applied are connected to the power transmission member, and the biasing member and the operating force transmission member are located on the other side in the seat width direction of the side frame. do.

[0009] According to the vehicle seat of claim 1, the biasing member applies a biasing force to the locking member to move the locking member to the locked position. Therefore, when no external force other than the biasing force is applied to the locking member, the locking member and the sector gear restrict rotation of the link member. As a result, the seat cushion frame cannot move up or down relative to the support member.

[0010] When an operating force inclined with respect to a tangent to the rotational trajectory of the locking member and resisting the biasing force of the biasing member is equal to or greater than a predetermined value, and this operating force is applied to the power transmission member, the linkage mechanism transmits this operating force to the locking member so that the locking member moves toward the unlocked position. Therefore, when an operating force equal to or greater than the predetermined value is applied to the power transmission member, the locking member moves to the unlocked position, and the seat cushion frame becomes able to move up and down relative to the support member.

[0011] When the locking member is in the locked position, if a tangential force that contacts the rotational path of the locking member is suddenly applied to the locking member, a moving force smaller than this force and in the same direction as the operating force acts on the power transmission member. This moving force is smaller than the tangential force that contacts the rotational path. Therefore, in this case, even if the biasing force of the biasing member is not large, there is little risk that the locking member, which is in the locked position, will unexpectedly move to the unlocked position.

[0013] Claim 1 According to the vehicle seat described in the above, the linking mechanism can be realized by a simple structure including a power transmission pin and an elongated hole.

[0015] Claim 1 According to the vehicle seat described in , the biasing member and the operation force transmission member are connected to the power transmission member, and therefore, the vehicle seat can be easily assembled so that the locking member is located on one side of the side frame in the seat width direction, the power transmission member is located on the other side of the side frame in the seat width direction, and the biasing member and the operation force transmission member are located on the other side of the side frame in the seat width direction.

[0016] Claim 2 The vehicle seat described in Claim 1 In the configuration described above, the sector gear has a plurality of first tooth portions, and the locking member has a plurality of second tooth portions that simultaneously mesh with the plurality of first tooth portions when the locking member is located at the locking position.

[0017] Claim 2 According to the vehicle seat described in the above, the risk of the link member rotating when the locking member is positioned in the locked position is reduced compared to when one tooth portion of the sector gear and one tooth portion of the locking member mesh with each other. [Effects of the Invention]

[0018] As described above, the vehicle seat of the present invention has the excellent effect of reducing the risk of the locking member unexpectedly moving to the unlocked position, which allows rotation of the link member, even when the biasing force that rotates the locking member to the locked position, which restricts rotation of the link member, is not large. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view showing a vehicle seat according to an embodiment of the present invention with some members omitted; [Figure 2] 1 is a perspective view showing the left side of a vehicle seat with some members omitted; [Figure 3] FIG. 2 is an enlarged perspective view showing a rear portion of a left side frame of the seat cushion frame. [Figure 4] FIG. 10 is a schematic plan view of the left rear link, the left side frame, and the locking member. [Figure 5] FIG. 10 is an enlarged perspective view showing the left side frame and a plurality of members supported by the side frame when the locking member is in the locked position. [Figure 6] FIG. 10 is an enlarged side view of the lock member and sector gear in the locked position. [Figure 7] FIG. 6 is an enlarged perspective view similar to FIG. 5 when the locking member is in the unlocked position. [Figure 8] FIG. 10 is an enlarged side view of the lock member and sector gear positioned at the unlocked position. [Figure 9] FIG. 2 is a schematic enlarged side view of a locking member, a power transmission member, a tension spring, and a wire. DETAILED DESCRIPTION OF THE INVENTION

[0020] A vehicle seat 20 according to an embodiment of the present invention will be described with reference to Figures 1 to 9. Note that in these figures, an arrow FR indicates the front side of the seat, an arrow UP indicates the upper side of the seat, and an arrow LH indicates the left side in the seat width direction (left-right direction).

[0021] As shown in Fig. 1, a vehicle seat 20 is provided on a vehicle body floor 11, which is part of the body of a vehicle 10. The vehicle seat 20 is a front seat on the left side. The vehicle seat 20 includes a lower rail 21, an upper rail 22, a riser (support member) 23, a lifter mechanism 25, and a seat body 37.

[0022] A pair of left and right lower rails 21 extending in the front-to-rear direction are fixed to the upper surface of the vehicle body floor 11. A pair of left and right upper rails 22 are slidably supported on each lower rail 21. Furthermore, each upper rail 22 is provided with a slide lock device (not shown) that restricts or allows the upper rail 22 to slide relative to the lower rail 21. Furthermore, a pair of left and right risers 23 are fixed to the left and right upper rails 22, respectively.

[0023] The left and right risers 23 are provided with a lifter mechanism 25. The lifter mechanism 25 has a pair of left and right front links (link members) 27, a connecting pin 28, a rear link (link member) 32, a connecting pin 33, and a connecting pin 29 (see FIG. 2), as well as a front shaft (not shown) and a rear shaft 34. The lower ends of the left and right front links 27 are rotatably connected to the front ends of the left and right risers 23, respectively, via the connecting pin 28 extending in the seat width direction. In addition, the lower ends of the left and right rear links 32 are rotatably connected to the rear parts of the left and right risers 23, respectively, via the connecting pin 33 extending in the seat width direction.

[0024] An upper portion of the lifter mechanism 25 supports a seat body 37. The seat body 37 includes a seat cushion 39, a seat back 45, a headrest, a locking member 50, a power transmission member 60, a tension spring (biasing member) 72, an operating handle 75, and a wire (operation force transmission member) 82.

[0025] The seat cushion 39 includes a metal seat cushion frame 40 serving as a framework member, and a cushion pad (not shown) covering the seat cushion frame 40. The seat cushion frame 40 includes a pair of left and right side frames 41 and a front frame 42 connecting the front ends of the left and right side frames 41. The upper ends of the left and right front links 27 are rotatably connected to the front ends of the left and right side frames 41 via connecting pins 29 extending in the seat width direction. The left and right front links 27 are further connected to each other by a front shaft (not shown) extending in the seat width direction. A metal rear shaft 34 extending in the seat width direction passes through rear portions of the left and right side frames 41 so as to be rotatable about its own axis. The upper ends of the left and right rear links 32 are fixed to both left and right ends of the rear shaft 34. As shown in FIG. 1 , a sector gear 32A is formed at the front end of the left rear link 32. The sector gear 32A includes a plurality of teeth (first teeth) 32B. For example, the sector gear 32A has ten teeth 32B. The upper part of the left rear link 32 and the left side frame 41 always face each other in the left-right direction, and the upper part of the right rear link 32 and the right side frame 41 always face each other in the left-right direction. Furthermore, a gap 41S (see FIG. 4) of a predetermined dimension is formed between the left rear link 32 and the left side frame 41, and a gap (not shown) of a predetermined dimension is formed between the right rear link 32 and the right side frame 41.

[0026] A four-bar link mechanism is formed by the risers 23, the front links 27, the rear links 32, and the side frames 41. When this four-bar link mechanism is operated, the seat cushion 39 moves up and down relative to the right and left risers 23.

[0027] As shown in FIG. 1 , a pair of left and right torsion springs 44 are attached to the left and right ends of the rear shaft 34 (the right torsion spring 44 is not shown in FIG. 1 ). A protrusion 41A is provided at the rear end of the opposing surface of the left and right side frames 41 (the right protrusion 41A is not shown in FIG. 1 ). One end of each of the left and right torsion springs 44 is fixed to the rear shaft 34. Meanwhile, the other end of each of the left and right torsion springs 44 is engaged with the protrusion 41A. The left and right torsion springs 44 are always elastically deformed from a free state. The left and right torsion springs 44 rotationally bias the rear shaft 34 and the left and right rear links 32 in a direction that raises the seat cushion 39 relative to the riser 23. Furthermore, although not shown, a torsion spring is attached to each of the left and right connecting pins 29. One end of each of the left and right torsion springs is fixed to the side frame 41, and the other end is engaged with the front shaft. These left and right torsion springs are always elastically deformed from their free state. The left and right torsion springs rotationally bias the left and right front links 27 and the connecting pin 29 in a direction that raises the seat cushion 39 relative to the riser 23.

[0028] The lower end of a seat back 45 is connected to the rear end of the seat cushion 39. The seat back 45 has a metal seat back frame 46 that is a framework member, and a cushion pad (not shown) that covers the seat back frame 46. The lower ends of a pair of left and right side frames 47 that form the left and right sides of the seat back frame 46 are connected to the rear ends of the left and right side frames 41, respectively.

[0029] A headrest (not shown) is provided at the upper end of the seat back 45.

[0030] As shown in FIG. 1, a metal locking member 50 is rotatably supported on the right side surface of the left side frame 41. The locking member 50 has the shape shown in FIG. 3. The locking member 50 includes a flat base plate portion 51 and a gear forming portion 54 protruding from the right side surface of the base plate portion 51. A substantially triangular pin support portion 52 is provided at the front end of the lower part of the base plate portion 51. A circular support hole 53 is formed in the pin support portion 52. Two tooth portions (second tooth portions) 55, 56 are formed at the rear end of the gear forming portion 54. The thickness (left-right dimension) of the gear forming portion 54 is greater than that of the base plate portion 51, and therefore the mechanical strength of the gear forming portion 54 is greater than that of the base plate portion 51. The tooth portions 55, 56 are formed across the entire thickness of the gear forming portion 54.

[0031] A through-hole (not shown) is formed in the upper part of the base plate portion 51, and a support shaft 57 extending in the left-right direction passes through this through-hole. As shown in FIGS. 5 and 7, the left end of the support shaft 57 passes through the left side frame 41 to the left, and the support shaft 57 is fixed to the side frame 41. The locking member 50 is rotatable about the support shaft 57. As shown in FIG. 4, the base plate portion 51 is located to the left of the rear link 32, and the gear forming portion 54 faces the rear link 32 in the front-rear direction.

[0032] As shown in Figures 5, 6, and 8, a through groove 41G is formed in the left side frame 41. The through groove 41G has an arc shape centered on the support shaft 57. Furthermore, the right end of a power transmission pin 59, which is a metal cylinder, is press-fitted into the support hole 53 of the pin support portion 52. In other words, the right end of the power transmission pin 59 is fixed to the pin support portion 52. The axis of the power transmission pin 59 is parallel to the left-right direction. As shown in Figures 5 and 7, the left end of the power transmission pin 59 passes through the through groove 41G to the left.

[0033] The locking member 50 is rotatable around the support shaft 57 between an unlocked position shown in FIGS. 3, 7, and 8 and a locked position shown in FIGS. 5 and 6. As shown in FIG. 8, when the locking member 50 is in the unlocked position, the middle portion of the power transmission pin 59 is located at the front end of the through groove 41G. As shown in FIG. 6, when the locking member 50 is in the locked position, the middle portion of the power transmission pin 59 is located at the rear end of the through groove 41G. When the locking member 50 is in the unlocked position, the teeth 55 and 56 of the locking member 50 move forward away from the sector gear 32A (teeth 32B) of the rear link 32. On the other hand, when the locking member 50 is in the locked position, the teeth 55 and 56 of the locking member 50 simultaneously mesh with the two teeth 32B of the sector gear 32A of the rear link 32. That is, the sector gear 32A of the rear link 32 and the teeth 55, 56 of the lock member 50 are designed and manufactured so that the teeth 55, 56 simultaneously mesh with the two teeth 32B.

[0034] As shown in FIGS. 2, 5, and 7, a power transmission member 60 made of a metal flat plate is provided on the right side of the left side frame 41. The thickness direction of the power transmission member 60 is approximately parallel to the left-right direction. The power transmission member 60 is formed with an elongated hole 61 that is linear in side view and inclined at an angle θA (see FIG. 9) with respect to a line 60L that is parallel to the longitudinal direction of the power transmission member 60. Furthermore, a locking pin 62 and a locking pin 63 are fixed to the left side surface of the power transmission member 60. A through-hole 60A (see FIG. 9) is formed in the front portion of the power transmission member 60, and a support shaft 65 extending in the left-right direction passes through this through-hole. As shown in FIGS. 1 and 2, the right end of the support shaft 65 passes through the left side frame 41 to the right, and the support shaft 65 is fixed to the side frame 41. The power transmission member 60 is rotatable around the support shaft 65.

[0035] 5 and 7, the left end of the power transmission pin 59 passes through a slot 61 in the power transmission member 60 to the left. The short dimension (width) of the slot 61 is slightly larger than the diameter of the power transmission pin 59, and the long dimension of the slot 61 is significantly longer than the diameter of the power transmission pin 59. Therefore, the power transmission pin 59 is relatively movable within the slot 61 along the longitudinal direction of the slot 61. Furthermore, when the locking member 50 rotates between the locked position and the unlocked position, the inner circumferential surface of the slot 61 applies a force to the outer circumferential surface of the power transmission pin 59, thereby linking the rotation of the locking member 50 with the rotation of the power transmission member 60. In other words, the power transmission pin 59 and the slot 61 are components of a linking mechanism 68. When the locking member 50 is in the locked position, the power transmission member 60 is in the initial position shown in FIGS. 2 and 5. When the locking member 50 is in the unlocked position, the power transmission member 60 is in the operating position shown in FIG. 7. When the power transmission member 60 is in the initial position, the power transmission pin 59 contacts the lower end of the inner surface of the elongated hole 61. Therefore, the power transmission member 60 cannot rotate counterclockwise in FIGS. 2 and 5 from the initial position. When the power transmission member 60 is in the operating position, the power transmission pin 59 contacts the upper end of the inner surface of the elongated hole 61. Therefore, the power transmission member 60 cannot rotate clockwise in FIGS. 2 and 7 from the operating position.

[0036] As shown in FIGS. 2, 5, and 7, a locking member 70 is fixed to the left side surface of the left side frame 41. Furthermore, one end of a metal tension spring 72 is locked to the locking pin 62 of the power transmission member 60, and the other end of the tension spring 72 is locked to the locking member 70. The locking member 70 is always in an extended state from its free state. Therefore, the locking member 70 always rotates the power transmission member 60 toward the initial position shown in FIG. 5. The biasing force generated by the tension spring 72 is referred to as biasing force F1 (see FIGS. 5 and 7). Therefore, when no external force other than biasing force F1 is applied to the power transmission member 60 and the locking member 50, the power transmission member 60 is located in the initial position and the locking member 50 is located in the locked position.

[0037] As shown in FIG. 2, an operating handle 75 is provided on the left side of the left side frame 41, located forward of the power transmission member 60. A support shaft 76 extending in the left-right direction is fixed to the left side surface of the side frame 41. A middle portion of the operating handle 75 is rotatably supported by the support shaft 76. The operating handle 75 is rotatable between an initial position shown by a solid line in FIG. 2 and an operating position shown by a virtual line in FIG. 2.

[0038] A metal support member 80 is fixed to the left side surface of the left side frame 41. The support member 80 has a through-hole (not shown) that penetrates through it. The rear end of a tube 81 made of a flexible material is connected to the front end of the support member 80 so as to be coaxial with the through-hole of the support member 80. Furthermore, a metal wire 82 is inserted into the tube 81 and the through-hole of the support member 80 so as to be relatively movable. The front end of the wire 82 is connected to the operating handle 75, and the rear end of the wire 82 is fixed to the locking pin 63. Therefore, the rotational movement of the power transmission member 60 and the rotational movement of the operating handle 75 are linked. That is, when the power transmission member 60 is in the initial position, the operating handle 75 is also in the initial position, and when the power transmission member 60 is in the operating position, the operating handle 75 is also in the operating position. As is clear from FIG. 2 , the power transmission member 60, the tension spring 72, and the wire 82 are located to the left of the left side frame 41.

[0039] (Action and effect) Next, the operation and effects of this embodiment will be described.

[0040] Assume that the vehicle seat 20 is in the state shown in Figures 1 and 2. That is, the power transmission member 60 and the operating handle 75 are in the initial position, and the locking member 50 is in the locked position. Therefore, as shown in Figure 6, the lower surfaces of the two toothed portions 32B of the rear link 32 are in contact with the upper surfaces of the two toothed portions 55, 56 of the locking member 50, respectively. Therefore, the seat cushion 39 is maintained at a predetermined height.

[0041] Next, assume that the occupant intentionally rotates the operating handle 75, which is in the initial position, to the operating position so that a tractive force FP (see FIG. 9) of a predetermined value or greater is applied to the wire 82. In this case, as shown in FIG. 7, the power transmission member 60 moves from the initial position to the operating position, and as shown in FIG. 8, the locking member 50 moves from the locked position to the unlocked position. As a result, the teeth 55, 56 of the locking member 50 move forward away from the sector gear 32A (tooth 32B) of the rear link 32. Therefore, when the occupant moves away from the seat cushion 39 with the operating handle 75 held in the operating position, the torsion spring 44 and the front link 27 and the rear link 32, which are rotated by the biasing force of the torsion spring, lift the seat cushion 39. Furthermore, when the occupant applies a downward load to the seat cushion 39 while the operating handle 75 is held in the operating position, the front link 27 and the rear link 32 lower the seat cushion 39 while resisting the biasing force of the torsion spring 44 and the torsion spring.

[0042] When the seat cushion 39 is positioned at the occupant's desired height, if the external force applied by the occupant to the operating handle 75 is released, the locking member 50 is returned to the locked position by the biasing force F1 of the tension spring 72, and the power transmission member 60 and the operating handle 75 are returned to their initial positions. Therefore, the sector gear 32A of the left rear link 32 and the locking member 50 maintain the seat cushion 39 at the desired height.

[0043] Next, assume that a forward external force F3F (see FIG. 9) resulting from a collision of the vehicle 10 is applied to the vehicle seat 20 when the vehicle seat 20 is in the state shown in FIGS. 1 and 2. This external force F3F causes an external force F3FA to act on the locking member 50. Here, if the rotation locus of the power transmission pin 59 about the support shaft 57 is RT, the tangent line that passes through the power transmission pin 59 and contacts the rotation locus RT is TG. The direction of the external force F3FA is parallel to the tangent line TG. Furthermore, the angle between the direction of this external force F3FA and the tractive force FP is θ. That is, the component force F3FB of the external force F3FA in a direction parallel to the tractive force FP is F3FA × sin θ. Therefore, the component force F3FB causes the power transmission member 60 to move from the initial position to the operating position. However, in this embodiment, the shapes of the power transmission pin 59 and the elongated hole 61 are designed so that the component force F3FB is smaller than the external force F3FA. Therefore, even if the biasing force F1 of the tension spring 72 is not large, there is little risk that the locking member 50 will unexpectedly rotate to the unlocked position due to an external force F3F unexpectedly acting on the vehicle seat 20.

[0044] Next, assume that a rearward external force F3R (see FIG. 9) resulting from a collision of the vehicle 10 is applied to the vehicle seat 20 when the vehicle seat 20 is in the state shown in FIGS. 1 and 2. This external force F3R causes an external force F3RA to act on the locking member 50. However, because the power transmission pin 59 is in contact with the lower end of the inner surface of the elongated hole 61, the power transmission member 60 cannot rotate counterclockwise from the initial position shown in FIG. 9. Therefore, there is little risk that the locking member 50 will unexpectedly rotate to the unlocked position.

[0045] As described above, in the vehicle seat 20 of this embodiment, even if the biasing force F1 of the tension spring 72 is not large, there is little risk that the locking member 50 will suddenly rotate to the unlocked position due to an external force suddenly acting on the vehicle seat 20.

[0046] Furthermore, in this embodiment, the power transmission pin 59 and the elongated hole 61 form a linking mechanism 68. In this manner, in this embodiment, the linking mechanism 68 can be realized by a simple structure including the power transmission pin 59 and the elongated hole 61.

[0047] Furthermore, in this embodiment, the locking member 50 is located to the right of the left side frame 41, the power transmission member 60, the tension spring 72, and the wire 82 are located to the left of the left side frame 41, and the tension spring 72 and the wire 82 are connected to the power transmission member 60. Therefore, it is easy to assemble the vehicle seat 20 so that the locking member 50 is located to the right of the left side frame 41 and the power transmission member 60, the tension spring 72, and the wire 82 are located to the left of the left side frame 41. In contrast, for example, a vehicle seat having a structure in which the wire 82 is connected to the left end of the power transmission pin 59 is not easy to assemble. That is, in this case, the left end of the power transmission pin 59 and the wire 82 must be moved to the left of the left side frame 41 and the power transmission member 60 through the through groove 41G and the elongated hole 61, which is not an easy task.

[0048] Furthermore, in this embodiment, the two teeth 55, 56 of the locking member 50 in the locked position simultaneously mesh with the two teeth 32B of the sector gear 32A of the rear link 32. Therefore, for example, when an occupant sits on the seat cushion 39 and a force is applied to the locking member 50 from the sector gear 32A of the rear link 32, the force is transmitted from the two teeth 32B to the two teeth 55, 56 while being dispersed. Furthermore, the teeth 55, 56 are formed over the entire thickness of the gear forming portion 54, and therefore have high mechanical strength. Therefore, compared to a case in which one tooth formed on the base plate portion 51 of the locking member 50 meshes with one tooth of the sector gear of the rear link 32, the locking member 50 of the vehicle seat 20 of this embodiment is less likely to be damaged, and there is less risk of the rear link 32 unexpectedly rotating when the locking member 50 is in the locked position.

[0049] Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.

[0050] For example, the locking member 50 and the rear link 32 (sector gear 32A) may be designed and manufactured so that three or more teeth provided on the locking member 50 simultaneously mesh with three or more teeth 32B.

[0051] The operating handle 75 may be omitted from the vehicle seat 20, and the end of the wire 82 opposite to the power transmission member 60 side may be connected to an electric actuator (not shown) provided in the vehicle seat 20. In this case, an operation switch for operating the electric actuator is provided, for example, on the side of the seat cushion 39. When the electric actuator operates and applies a traction force to the wire 82, the locking member 50, which is located in the locked position, moves to the unlocked position. Furthermore, when the operation of the electric actuator stops, the biasing force F1 of the tension spring 72 returns the locking member 50 to the locked position.

[0052] One end of the tension spring 72 may be connected to the lock member 50 instead of the power transmission member 60 .

[0053] The locking member 50 may be formed with a slot 61, and the power transmission member 60 may be provided with a power transmission pin 59. [Explanation of symbols]

[0054] 11 Car body floor 20 Vehicle seats 23 Riser (support member) 27 Front link (link member) 32 Rear link (link member) 32A sector gear 32B Teeth (1st tooth) 39 Seat Cushion 40 Seat cushion frame 41 Side frame 50 Locking member 55 Tooth part (second tooth part) 56 Tooth part (second tooth part) 59 Power transmission pin 60 Power transmission components 61 long hole 68 Coordination Mechanism 72 Tension spring (biasing member) 82 Wire (operating force transmission member) F1 biasing force F2 Traction force (operating force) F2a component force RT rotation trajectory TG tangent

Claims

1. a support member supported on a vehicle body floor; a seat cushion frame that is a part of the seat cushion and that is movable up and down relative to the support member; a link member rotatably connected to the support member and the seat cushion frame, which rotates to raise and lower the seat cushion frame relative to the support member and is biased in a direction to raise the seat cushion frame; a sector gear provided on the link member; a locking member supported by the seat cushion and rotatable between a locked position where the locking member engages with the sector gear from the front side of the vehicle to restrict rotation of the link member and an unlocked position where the locking member moves away from the sector gear toward the front side of the vehicle; a biasing member that generates a biasing force that moves the locking member to the locking position; a power transmission member rotatably supported on the seat cushion; a linking mechanism that links the locking member and the power transmission member, and that transmits an operating force to the locking member such that the locking member moves toward the unlock position when an operating force is applied to the power transmission member in a direction inclined with respect to a tangent to a rotation trajectory of the locking member and directed toward the front of the vehicle against the biasing force and the operating force has a magnitude equal to or greater than a predetermined value; Preparation, The linking mechanism is a power transmission pin provided on one of the locking member and the power transmission member; an elongated hole provided in the other of the locking member and the power transmission member, into which the power transmission pin is inserted; Equipped with when the locking member rotates between the locked position and the unlocked position, the power transmission pin moves within the elongated hole, and one of the power transmission pin and the inner surface of the elongated hole provided in the power transmission member transmits the operating force to the other of the power transmission pin and the inner surface of the elongated hole provided in the locking member, the locking member is located on one side of a side frame constituting a side portion of the seat cushion frame in a seat width direction, and the power transmission member is located on the other side of the side frame in the seat width direction, the biasing member and an operation force transmission member to which the operation force is applied are connected to the power transmission member, The vehicle seat, wherein the biasing member and the operation force transmission member are positioned on the other side of the side frame in the seat width direction.

2. the sector gear has a plurality of first teeth, The vehicle seat according to claim 1, wherein the locking member includes a plurality of second teeth that simultaneously mesh with the plurality of first teeth when the locking member is in the locked position.

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