Seat slide device

Abstract

To provide a configuration in which a walk-in mechanism can be assembled to an upper rail after rail-fitting the upper rail to a lower rail in a post-process.SOLUTION: A walk-in mechanism 60 includes: a bracket 61; a first link 73, a second link 72, a third link 73 which are biased to be tiltable with respect to the bracket 61; and a cam 80 which is formed with an insertion hole 81 into which a screw section 44a to be a rotation center is inserted, rotates to a regulation position for regulating tilting of the second link 72 at the time of an unlocking state and rotates to a regulation release position for releasing tilting regulation of the second link 72 by abutting on an abutting section 27 fixed to a lower rail 20 when sliding backward up to a prescribed slide position in a state of the regulation position and being pushed and rotated. The cam 80 is rotatably supported by a bolt 44 through a bush 85 assembled to the insertion hole 81. The bush 85 and the bracket 61 are fastened together by a nut 47 fastened to the screw section 44a.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a seat slide device provided with a walk-in mechanism.

Background Art

[0002] Conventionally, as a seat slide device provided with a walk-in mechanism, for example, an automotive walk-in seat slide device disclosed in Patent Document 1 below is known. In this seat slide device, a latch member for locking is supported by a first support plate fixed to the upper piece of an upper rail, and a first walk-in lever and a second walk-in lever that are rotatably supported with respect to a second support plate to which the first support plate is fixed are provided. The walk-in mechanism is configured to include components such as these. In this walk-in mechanism, as the seat back tilts forward, the first walk-in lever rotates clockwise, causing the latch member to rotate in the unlocking direction and enter a slidable state. As the second walk-in lever rotates in accordance with this rotation, an engaging projection provided on the second walk-in lever engages within the engaging portion of the first walk-in lever, thereby holding the first walk-in lever in the walk-in operating position and holding the latch member in the released position, thus maintaining the slidable state. Then, when the seat is returned rearward to the standard position, the canceling portion of the second walk-in lever abuts against the front edge of a walk-in plate fixed to the lower rail, causing the second walk-in lever to rotate so that the engaging projection disengages from within the engaging portion. As a result, the first walk-in lever becomes free to rotate, and the latch member locks, fixing the seat in the standard position.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, regarding the manufacturing process of the seat slide device, automation of rail fitting between the upper rail and the lower rail can reduce manufacturing costs and shorten working hours. The same applies to a seat slide device provided with a walk-in mechanism. However, in order to automate the rail fitting between the upper rail and the lower rail with the walk-in mechanism assembled, there is a problem that a dedicated jig, a manufacturing line, etc. that do not affect the shape, operation, etc. of the walk-in mechanism are required. In particular, in a configuration in which the walk-in mechanism includes a link or the like that temporarily stops the backward slide for returning to the locked state when the seat slides forward in the seat-tilted state and then slides backward in the seat-tilted state, since there are many parts assembled to the upper rail before rail fitting, it becomes more difficult to automate the rail fitting.

[0005] Further, in the seat slide device etc. of Patent Document 1 described above, even when trying to assemble the walk-in mechanism to the upper rail after rail fitting with the lower rail, since the lower rail interferes, it becomes difficult to assemble the walk-in mechanism, and there is a problem that it becomes difficult to reduce manufacturing costs and shorten working hours.

[0006] The present invention has been made to solve the above-described problems, and an object thereof is to provide a configuration in which a walk-in mechanism can be assembled in a post-process with respect to an upper rail after rail fitting with a lower rail.

Means for Solving the Problems

[0007] To achieve the above object, the present invention provides a lower rail (20) fixed to a vehicle body, an upper rail (30) fixed to a seat and provided slidably with respect to the lower rail, a lock mechanism (50) assembled to the upper rail within a rail space formed by the lower rail and the upper rail, for locking the upper rail so as not to be slidable with respect to the lower rail A walk-in mechanism (60) assembled to the upper rail, A seat slide device (10) comprising: On the upper wall (31) of the upper rail, a communication port (31a) communicating with the rail space is formed, and a fastening member (44) is assembled so that a screw portion (44a) extends upward in the vertical direction. The walk-in mechanism includes: A bracket (61) having a first insertion hole (61d) formed therein for fastening to the upper wall of the upper rail and through which the screw portion is inserted; A first link (71) that is biased so as to be tiltable with respect to the bracket and that tilts in a first unlocking direction (F1) from a predetermined tilt position against the bias when the seat tilts forward; A second link (72) that is biased so as to be tiltable with respect to the bracket and that tilts in a second unlocking direction (F2) against the bias in response to the tilt of the first link in the first unlocking direction, and presses the pressing piece (72a) that has entered the rail space through the communication port to switch the lock mechanism to an unlocked state; A third link (73) that is biased so as to be tiltable with respect to the bracket and that tilts against the bias by the pressing of the first link in the predetermined tilt position, and the pressing is released when the first link tilts in the first unlocking direction; A cam (80) having a second insertion hole (81) through which the screw portion serving as a rotation center is inserted, rotating to a regulation position that regulates the tilt of the second link in the unlocked state, and rotating to a regulation release position that releases the tilt regulation of the second link when it abuts against and is pushed back by an abutting portion (27) fixed to the lower rail when sliding backward to a predetermined slide position in the state of the regulation position; Comprising: The cam is rotatably supported by the fastening member via a bush (85) assembled to the second insertion hole. The bush and the bracket are fastened together by a nut (47) fastened to the screw portion. Note that the reference signs in the parentheses above indicate the correspondence with the specific means described in the embodiments described later.

Advantages of the Invention

[0008] In the present invention, the walk-in mechanism includes a bracket fastened to the upper wall of the upper rail and having a first insertion hole through which a threaded portion is inserted, a first link biased to be tiltable with respect to the bracket and tilted from a predetermined tilt position in a first unlocking direction against the bias when the seat tilts forward, a second link biased to be tiltable with respect to the bracket and tilted in a second unlocking direction against the bias in response to the tilt of the first link in the first unlocking direction, and pressing the locking mechanism to be switched to an unlocked state by a pressing piece that enters the rail space through a communication port in the upper wall of the upper rail, a third link biased to be tiltable with respect to the bracket and tilted against the bias by the pressing of the first link in a predetermined tilt position, and the pressing being released when the first link tilts in the first unlocking direction, and a cam having a second insertion hole through which a threaded portion serving as a rotation center is inserted, rotating to a regulation position that regulates the tilt of the second link in the unlocked state, and rotating to a regulation release position that releases the tilt regulation of the second link by abutting against and being pushed back by an abutting portion fixed to the lower rail when sliding backward to a predetermined slide position in the state of the regulation position. The cam is rotatably supported by a fastening member via a bush assembled in the second insertion hole, and the bush and the bracket are fastened together by a nut fastened to the threaded portion.

[0009] As a result, as the first link tilts in the first unlocking direction when the seat tilts forward, the second link tilts in the second unlocking direction, causing the locking mechanism to switch to the unlocked state. At this time of the unlocked state, since the cam rotates to the regulating position that regulates the tilting of the second link, the unlocked state is continued. Then, when sliding backward to a predetermined slide position, the cam pushed by the contact portion of the lower rail rotates to the regulation release position, releasing the tilting regulation of the second link and causing the locking mechanism to enter the locked state. The third link is urged in its biasing direction because the pressing force is released when the first link tilts in the first unlocking direction. Therefore, when the third link slides forward in the seat forward-tilted state and then slides backward while maintaining the seat forward-tilted state, it can be adopted as a link that temporarily stops the backward sliding for the return of the locked state.

[0010] In particular, after assembling the three links to the bracket so as to be tiltable, an assembling step can be adopted in which the bush assembled to the second insertion hole of the cam and the bracket are tightened together using the screw portion of the upper wall of the upper rail. Thus, a seat slide device can be realized in which the walk-in mechanism can be assembled in a subsequent process with respect to the upper rail after the lower rail is fitted to the rail.

Brief Description of the Drawings

[0011]

Figure 1

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Figure 16

Embodiments for Carrying Out the Invention

[0012] [First Embodiment] Hereinafter, a first embodiment in which the seat slide device according to the present invention is embodied will be described with reference to the drawings. As shown in FIGS. 1 to 7, a seat slide device 10 supports a vehicle seat so as to be relatively movable (slide) in the front-rear direction with respect to the vehicle body. Mainly, a lower rail 20 fixed to the vehicle body, an upper rail 30 fixed to the vehicle seat and slidably provided with respect to the lower rail 20, a lock mechanism 50 and a walk-in mechanism 60 are provided in pairs (only one is shown in FIG. 1 and the like), and an operation lever (not shown) for switching the lock state of the pair of lock mechanisms 50 is provided.

[0013] As shown in FIGS. 4 and 7, the lower rail 20 includes a bottom wall 22 fixed to the vehicle body via front and rear feet 21 so as to extend in the slide direction, a pair of first side portions 23 extending upward from both ends of the bottom wall 22, a flange portion 24 provided inward from the upper ends of both first side portions 23 and substantially parallel to the bottom wall 22, and a second side portion 25 extending from the inner ends of both flange portions 24 toward the bottom wall 22 and substantially parallel to the first side portion 23. A plurality of notches 25a that can be engaged with and disengaged from the locking claws 51a of the locking member 51 described later are provided at equal intervals on one of the second side portions 25 (see FIG. 7).

[0014] The upper rail 30 includes an upper wall 31 to which the vehicle seat is attached via brackets (not shown) in a state where the walk-in mechanism 60 is assembled, side walls 32 vertically provided from both ends of the upper wall 31, connecting portions 33 bent upward from the lower ends of both side walls 32, and an inclined portion 34 that holds the upper steel ball 42 held by the retainer 41 in the space between the lower rail 20.

[0015] As shown in FIGS. 6 and 7, on the upper wall 31, there are formed a communication port 31a that opens in a rectangular shape so as to communicate with a rail space formed by rail fitting of the lower rail 20 and the upper rail 30, and press-fitting holes 31b and 31c into which bolts 44 and 45 are press-fitted from within the rail space. Further, through holes for various fastening members such as rivets 46 are formed in the upper wall 31 respectively.

[0016] The locking mechanism 50 is a mechanism for locking the upper rail 30 so as not to be slidable relative to the lower rail 20, and is assembled to the upper rail 30 within the rail space. The locking mechanism 50 is configured such that a locking member 51 having a locking claw 51a is supported by a bracket 52 fixed to the upper rail 30 so as to be displaceable. The locking member 51 is biased by a spring 53 so that when the operating lever is not operated, the locking claw 51a engages with the notch 25a of the lower rail 20 to be in a locked state, and is pushed down by a pressing force or the like during operation via the operating lever, so that the locking claw 51a is disengaged from the notch 25a to be in an unlocked state.

[0017] The locking member 51 is supported by the bracket 52 so that a part thereof is exposed through the communication port 31a of the upper rail 30, and is also formed to be in an unlocked state when it is pushed down when a pressing piece 72a described later enters the rail space through the communication port 31a.

[0018] Before the upper rail 30 is fitted with the rail, the locking mechanism 50 is assembled, and fastening members such as bolts 44 are press-fitted into the respective press-fitting holes including the press-fitting hole 31b in the upper wall 31. The bolt 44 is press-fitted into the press-fitting hole 31b such that the threaded portion 44a extends upward in the vertical direction. The upper rail 30 with the locking mechanism 50 assembled in this way is rail-fitted to the lower rail 20 such that the upper wall 31 faces the bottom wall 22 and the inclined portion 34 enters between the first side portion 23 and the second side portion 25. At the time of this rail fitting, upper steel balls 42 and lower steel balls 43 held by a retainer 41 are arranged between the lower rail 20 and the upper rail 30, whereby the upper rail 30 is smoothly slidably assembled to the lower rail 20. Note that the bolt 44 may correspond to an example of the "fastening member".

[0019] As shown in FIG. 8 and the like, the walk-in mechanism 60 is configured to include a bracket 61 fastened to the upper wall 31 of the upper rail 30, three links (hereinafter also referred to as a first link 71, a second link 72, and a third link 73) supported in a state of being respectively biased so as to be tiltable with respect to the bracket 61, and a cam 80.

[0020] The bracket 61 is formed with a pair of support holes 61a for supporting a shaft portion 62 that is the tilting center of the first link 71 and the second link 72 so as to be orthogonal to the sliding direction, and a support hole 61b for supporting the third link 73 so that the tilting center is orthogonal to the sliding direction. Further, the bracket 61 is formed with an opening 61c and an insertion hole 61d that are respectively continuous with the communication port 31a and the press-fitting hole 31b of the upper wall 31 when fastened to the upper wall 31. Note that the insertion hole 61d may correspond to an example of the "first insertion hole".

[0021] When the vehicle seat is not tilted forward, the first link 71 assumes the default tilting position shown in FIGS. 2, 3, and 9(A) due to the biasing by the spring 63a or the like. When the vehicle seat is in the seat forward tilt state where it tilts forward, it is assembled to the shaft portion 62 so as to tilt from the default tilting position in the first unlock direction F1 against the biasing by receiving a tensile force from a wire (not shown) (see FIG. 9(B)). The first link 71 is provided with a cylindrical portion 71a for tilting the second link 72 when tilting in the first unlock direction F1. Further, the first link 71 is provided with a pressing portion 71b that presses the third link 73 against its biasing at the default tilting position and releases the pressing when tilting in the first unlock direction F1. In FIG. 9, the first link 71, the second link 72, and the third link 73 are mainly illustrated.

[0022] The second link 72 assumes the tilting position shown in FIG. 10(A) due to the biasing by the spring 63b or the like, and is assembled to the shaft portion 62 so as to tilt in the second unlock direction F2 against the biasing by being pressed by the cylindrical portion 71a of the first link 71 that tilts in the first unlock direction F1 (see FIG. 10(B)). The second link 72 is provided with a pressing piece 72a for pushing down the lock member 51 so as to enter the rail space through the opening 61c and the communication port 31a and be in the unlocked state when tilting in the second unlock direction F2. This pressing piece 72a is formed such that at least the upper part protrudes from the opening 61c and does not contact the lock member 51 when not being pressed by the first link 71, and enters the rail space without protruding from the opening 61c when the lock member 51 is in the unlocked state.

[0023] The third link 73 is a link for temporarily stopping the backward slide for the return of the locked state when sliding backward with the seat in the forward tilted state after sliding forward in the seat forward tilted state. The third link 73 is provided with a pressure receiving portion 73a on the rear side in the sliding direction of the portion that is tiltably supported by the support hole 61b, and an engaging piece 73b is provided on the front side in the sliding direction. The third link 73 is biased by a biasing member (not shown) in a tilting direction in which the engaging piece 73b is pushed down about the support hole 61b.

[0024] The pressure receiving portion 73a is formed so as to receive a pressing force in the pushing down direction against the biasing force by the pressing portion 71b of the first link 71 at a specified tilting position. For this reason, when the pressure receiving portion 73a of the third link 73 is pressed in the pushing down direction by the pressing portion 71b of the first link 71 at the specified tilting position, the engaging piece 73b is pushed up against the biasing force, and the third link 73 is in a tilting state (hereinafter, also referred to as a pushed-up tilting state). Further, when the pressing force on the pressure receiving portion 73a is released, the engaging piece 73b is pushed down according to the biasing force, and the third link 73 is in a tilting state (hereinafter, also referred to as a pushed-down tilting state).

[0025] The engaging piece 73b is arranged so as to be displaced inward of the rail with respect to the other portion of the third link 73, and is formed so as to pass over the upper surface of the plate-shaped stopper 26 fixed inside the lower rail 20 during sliding in the pushed-up tilting state. Further, when the engaging piece 73b slides backward to a predetermined sliding position in the pushed-down tilting state, it contacts the front end portion 26a of the plate-shaped stopper 26 for the return of the locked state, and the contact state is formed so as to be released in the pushed-up tilting state.

[0026] The cam 80 is a member for controlling the tilting of the second link 72 in the unlocked state. The cam 80 is formed with an insertion hole 81 serving as a rotation center, and one side piece portion 83 and the other side piece portion 84 facing each other in the rotation direction via a slit 82. The slit 82 is formed so as to expose the opening 61c of the bracket 61 from between the one side piece portion 83 and the other side piece portion 84 when the cam 80 rotates to a regulation release position where the regulation of the tilting of the second link 72 can be released.

[0027] As shown in FIGS. 11(A) and 12, the cam 80 is rotatably supported by the non-threaded portion of the bolt 44 that passes through the insertion hole 61d via the bush 85 assembled in the insertion hole 81 with the pressing piece 72a of the second link 72 inserted into the slit 82. The insertion hole 81 may correspond to an example of the "second insertion hole". FIG. 11 mainly shows the cam 80 and the second link 72.

[0028] When the pressing piece 72a is inserted into the slit 82, the cam 80 rotates to a regulation release position where the one-side piece 83 is pressed against the pressing piece 72a in the side surface direction (clockwise direction in FIG. 11) in response to the biasing force of the spring member 63c.

[0029] When the pressing piece 72a enters the rail space so as to push down the locking member 51, the one-side piece 83 is no longer pressed against the pressing piece 72a. Therefore, in response to the biasing force of the spring member 63c, as shown in FIG. 11(B), the one-side piece 83 rotates to a position (hereinafter also referred to as the regulation position) that covers the opening 61c.

[0030] When the one-side piece 83 is in the regulation position, the state where the pressing piece 72a enters the rail space so as to push down the locking member 51 is maintained (see FIG. 10(B)), thereby regulating the tilting of the second link 72 in the unlocked state. On the other hand, at least a part of the other-side piece 84 in the regulation position rotates so as to protrude outside the outer surface of the upper rail 30.

[0031] When the cam 80 slides backward to a predetermined slide position in the regulation position state, the other-side piece 84 abuts against the contact portion 27 fixed to the lower rail 20 and is pushed back against the biasing force of the spring member 63c, thereby rotating to the regulation release position.

[0032] Due to this rotation, the opening 61c is exposed, and thus the second link 72 tilts such that the pressing piece 72a pops out from the opening 61c by the biasing force of the spring 63b. Due to the tilting of this second link 72, the locking member 51 cannot be pushed down by the pressing piece 72a, and thus the locking mechanism 50 enters the locked state.

[0033] The walk-in mechanism 60 configured as described above is assembled into the bracket 61 together with the three links (the first link 71, the second link 72, and the third link 73) and the respective biasing members (the spring 63a, the spring 63b, etc.) to obtain the assembled state shown in FIG. 6. Then, when fastening and fixing the bracket 61 in this assembled state to the upper rail 30 after the lower rail 20 and the rail are fitted, the bush 85 assembled in the insertion hole 81 and the bracket 61 are fastened together by the nut 47 fastened to the threaded portion 44a of the bolt 44, so that the cam 80 is rotatably supported with respect to the bolt 44. Further, the bracket 61 is fastened and fixed by using other fastening members press-fitted into the upper wall 31 of the upper rail 30, such as the nut 48 fastened to the bolt 45, and thus the assembly of the walk-in mechanism 60 to the upper rail 30 is completed.

[0034] In this way, the walk-in mechanism 60 according to the present embodiment can be assembled in a subsequent process with respect to the upper rail 30 after the lower rail 20 and the rail are fitted, by using the bolt 44 press-fitted into the upper rail 30 for both fastening and rotational support.

[0035] Next, the operation of the seat slide device 10 according to the present embodiment during walk-in will be described with reference to the drawings.

[0036] When the vehicle seat is not tilted forward, as shown in FIGS. 2 and 3, since the first link 71 is in the predetermined tilting position, the second link 72 is in a tilting state where the upper part of the pressing piece 72a protrudes from the opening 61c, and the state where the cam 80 has rotated to the regulation release position is maintained. Further, the third link 73 is maintained in a lifted tilting state where the pressure receiving part 73a is pressed in the pressing down direction by the pressing part 71b of the first link 71. In this state, when the upper rail 30 slides in the front-rear direction with respect to the lower rail 20 due to the unlocking state of the lock mechanism 50 in response to the operation of the operation lever, the slide is not hindered by each link or the like.

[0037] Thereafter, when the seat is tilted forward, the first link 71 tilts in the first unlocking direction F1, and the second link 72 pressed by the cylindrical portion 71a tilts in the second unlocking direction F2. As a result, the lock member 51 pushed down by the pressing piece 72a that has entered the rail space is in the unlocked state, and the upper rail 30 becomes slidable with respect to the lower rail 20. Further, as described above, when the pressing piece 72a enters the rail space, the tilting of the second link 72 in the unlocked state is restricted by one side piece portion 83 of the cam 80 that has rotated to the restricting position covering the opening 61c. Thereby, the state where the vehicle seat can slide forward (unlocked state) is maintained. Further, the third link 73 becomes a pressed-down tilting state when the pressing of the pressure receiving part 73a by the pressing part 71b of the first link 71 is released. As a result, as shown in FIGS. 13(A) and 13(B), the upper rail 30, the walk-in mechanism 60, etc. can be slid forward with respect to the lower rail 20. In FIGS. 13 to 16, for convenience of explanation, the illustration of the springs 63a, 63b, etc. is omitted.

[0038] After sliding the vehicle seat forward as described above, when the vehicle seat is slid from the front to a predetermined slide position rearward as shown in FIGS. 14(A) and 14(B), the engaging piece 73b of the third link 73 in the pressed and tilted state contacts the front end portion 26a of the plate-shaped stopper 26. As a result, the backward slide is temporarily stopped, and due to the momentum of the backward slide at that time, the vehicle seat returns from the forward-tilted posture to the original posture.

[0039] Due to the return of this vehicle seat, the tensile force on the first link 71 disappears. Therefore, as shown in FIGS. 15(A) and 15(B), the first link 71 begins to tilt toward the predetermined tilt position by the biasing force of the spring 63a. At that time, while the other side piece portion 84 of the cam 80 is in contact with the contact portion 27 and is pushed around, the cam 80 rotates against the biasing force from the restricted position to the restricted release position.

[0040] When the pressing portion 71b presses down the pressure receiving portion 73a again due to the tilting of the first link 71, as shown in FIGS. 16(A) and 16(B), the third link 73 becomes the pushed-up and tilted state again. As a result, the engaging piece 73b no longer contacts the front end portion 26a of the plate-shaped stopper 26, so that it becomes slidable again.

[0041] Further, since the rotation of the cam 80 exposes the one-side piece portion 83 from the opening 61c, when the second link 72 tilts so that the pressing piece 72a pops out from this opening 61c, the lock mechanism 50 becomes the locked state. At that time, the cam 80 rotates to the restricted release position where the one-side piece portion 83 presses against the pressing piece 72a of the second link 72 that has entered the slit 82. As a result, each of the links 71, 72, and 73 returns to the original tilted state and the cam 80 returns to the original rotational position, completing the return of the walk-in mechanism 60.

[0042] As described above, in the seat slide device 10 according to the present embodiment, the walk-in mechanism 60 includes a bracket 61 that is fastened to the upper wall 31 of the upper rail 30 and has an insertion hole 61d through which the screw portion 44a is inserted, a first link 71 that is biased so as to be tiltable with respect to the bracket 61 and tilts in the first unlocking direction F1 from a predetermined tilting position against the bias when the seat tilts forward, a second link 72 that is biased so as to be tiltable with respect to the bracket 61 and tilts in the second unlocking direction F2 against the bias in response to the tilting of the first link 71 in the first unlocking direction F1, and presses the locking mechanism 50 to switch it to the unlocked state by the pressing piece 72a that has entered the rail space through the communication port 31a of the upper wall 31 of the upper rail 30, and a third link 73 that is biased so as to be tiltable with respect to the bracket 61, tilts against the bias by the pressing of the first link 71 in the predetermined tilting position, and the pressing is released when the first link 71 tilts in the first unlocking direction F1. A cam 80 is formed with an insertion hole 81 through which the screw portion 44a serving as a rotation center is inserted, rotates to a regulation position that regulates the tilting of the second link 72 in the unlocked state, and rotates to a regulation release position that releases the tilting regulation of the second link 72 by abutting against and being pushed back by the abutting portion 27 fixed to the lower rail 20 when sliding backward to a predetermined slide position in the state of the regulation position. The cam 80 is rotatably supported by a bolt 44 via a bush 85 assembled in the insertion hole 81, and the bush 85 and the bracket 61 are fastened together by a nut 47 fastened to the screw portion 44a.

[0043] Thereby, it is possible to realize the seat slide device 10 including the walk-in mechanism 60 that utilizes the tilting of the three links 71, 72, 73 and the rotation of the cam 80. In particular, after assembling the three links 71, 72, 73 to the bracket 61 so as to be tiltable, an assembling step of fastening together the bush 85 assembled in the insertion hole 81 of the cam 80 and the bracket 61 using the screw portion 44a of the upper wall 31 of the upper rail 30 can be adopted, so that it is possible to realize the seat slide device 10 in which the walk-in mechanism 60 can be assembled in a subsequent process with respect to the upper rail 30 after the lower rail 20 is fitted to the rail.

[0044] [Other Embodiments] Note that the present invention is not limited to the above-described embodiments and the like, and may be embodied, for example, as follows. (1) The present invention is not limited to being adopted in the walk-in mechanism 60 that utilizes the tilting of the three links 71, 72, 73 and the rotation of the cam 80. After assembling the three links to the bracket so as to be tiltable, a cam for restricting the tilting of one link may be adopted in a walk-in mechanism configured to be fastened together with a bush assembled in its insertion hole to the bracket using the threaded portion of the upper rail.

Explanation of Reference Numerals

[0045] 10 Seat Slide Device 20 Lower Rail 26 Plate-like Stopper 27 Contact Portion 30 Upper Rail 31 Upper Wall 31a Communication Port 31b Press-fitting Hole 44 Bolt (Fastening Member) 44a Threaded Portion 47 Nut 50 Lock Mechanism 60 Walk-in Mechanism 61 Bracket 61c Opening 61d Insertion Hole (First Insertion Hole) 71 First Link 72 Second Link 72a Pressing Piece 73 Third Link 80 Cam 81 Insertion Hole (Second Insertion Hole) 85 Bush F1 First Lock Release Direction F2 Second Lock Release Direction

Claims

【Claim 1】 A lower rail fixed to the vehicle body, an upper rail fixed to the seat and provided slidably with respect to the lower rail, a locking mechanism assembled to the upper rail within a rail space formed by the lower rail and the upper rail for locking the upper rail so as not to slide with respect to the lower rail, a walk-in mechanism assembled to the upper rail, A seat slide device comprising: On the upper wall of the upper rail, a communication port communicating with the rail space is formed, and a fastening member is assembled so that a threaded portion extends upward in the vertical direction, The walk-in mechanism is a bracket fastened to the upper wall of the upper rail and having a first insertion hole through which the threaded portion is inserted, a first link biased to be tiltable with respect to the bracket and tilting in a first unlocking direction against the bias from a predetermined tilting position when the seat tilts forward, a second link biased to be tiltable with respect to the bracket and, in response to the tilting of the first link in the first unlocking direction, tilting in a second unlocking direction against the bias to press the locking mechanism to be switched to an unlocked state by a pressing piece that has entered the rail space through the communication port, a third link biased to be tiltable with respect to the bracket and tilting against the bias by the pressing of the first link in the predetermined tilting position, and the pressing being released when the first link tilts in the first unlocking direction, a cam having a second insertion hole through which the threaded portion serving as a rotation center is inserted, rotating to a regulation position for regulating the tilting of the second link in the unlocked state, and rotating to a regulation release position for releasing the tilting regulation of the second link by abutting against and being pushed back by an abutting portion fixed to the lower rail when sliding backward to a predetermined slide position in the state of the regulation position, comprising The cam is rotatably supported by the fastening member through a bush assembled to the second insertion hole, The seat slide device, wherein the bush and the bracket are fastened together by a nut fastened to the threaded portion.

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