JP2005152103A - Seat reclining device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the lock release of a reclining mechanism and a folding mechanism by one lever operation without deteriorating the appearance around an intermediate plate. <P>SOLUTION: A first reclining mechanism 9 is provided at the connected section between a seat cushion SC and the intermediate plate 5, and the angle adjustment of a seat back SB is performed by rotating the seat back SB together with the intermediate plate 5 with a first rotating shaft 7 as a pivot. A second reclining mechanism 13 is provided at the connected section between the seat back SB and the intermediate plate 5, and the seat back SB is superposed with the seat cushion SC by rotating the seat back SB with a second rotating shaft 11 as a pivot. First and second lock releasing levers 23 and 25 which release respective locking mechanisms of the first and second reclining mechanisms 9 and 13 are connected with each other by a connecting link 37. The lock releasing of respective lock mechanisms is performed in association with each other by the operation of a lock releasing operation lever which is connected with the connecting link 37 through a lock releasing cable 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle seat reclining device that has a reclining function for adjusting the angle of a seat back in the front-rear direction and that can be folded by folding the seat back on a seat cushion. The present invention relates to a vehicle seat reclining device suitable for use as a front assistant seat (first row seat), a second seat (second row seat) or a third seat (third row seat) of an automobile of a type or the like.

Examples of the vehicle seat reclining device that can fold the seat back as described above into the seat cushion include those described in Patent Documents 1 and 2 below.
JP-A-11-75980 JP, 2002-315646, A The thing of these each gazettes connects a seat cushion and a seat back with an intermediate plate, and either a reclining mechanism or a folding mechanism is connected to a connection part of an intermediate plate and a seat cushion. The connecting portion between the intermediate plate and the seat back is provided with either the reclining mechanism or the folding mechanism.

  Here, in the above-described Patent Document 1, the reclining mechanism provided at the connecting portion between the seat cushion and the intermediate plate and the folding mechanism provided at the connecting portion between the intermediate plate and the seat back are provided on the intermediate plate. It is configured to operate with one operating lever provided in the center.

  In this case, the operation lever operation (unlocking operation) directions for the reclining mechanism and the folding mechanism are opposite to each other. When the folding mechanism is operated to fold the seat back into the seat cushion, After operating the reclining mechanism at a predetermined angle, it is necessary to operate the folding mechanism.

  In addition, in the device described in Patent Document 2, each of the reclining mechanism and the folding mechanism is unlocked in conjunction with one unlock lever provided between these mechanisms. A reclining operation lever is connected to the unlocking lever, and when the reclining operation lever is operated, the reclining mechanism is first unlocked, and then the folding mechanism is unlocked later.

  By the way, in the thing of the above-mentioned patent document 1, even if the seat back is tilted backward, that is, the reclining mechanism is not in the forward tilted position, the folding mechanism can be operated to fold the seat back. is there. In this case, the seat back cannot be folded horizontally. Therefore, it is necessary to operate the reclining mechanism separately, which is very inconvenient.

  Therefore, the one described in Patent Document 2 described above is configured to operate the reclining mechanism and the folding mechanism by one operation of one lever.

  By the way, in each of the above-described patent documents 1 and 2, the reclining mechanism and the folding mechanism are operated by one lever (the former is an operation lever and the latter is an unlock lever). Is disposed between the reclining mechanism and the folding mechanism, that is, at the center of the intermediate plate.

  However, since a separate lever is provided on the intermediate plate, the number of parts increases and the cost increases. In addition, the intermediate plate is set between the seat cushion and the seat back, and can not be hidden by the seat cushion or the seat back and exposed to the outside. The cover will become larger and the appearance will deteriorate.

  Accordingly, an object of the present invention is to make it possible to easily unlock each of the reclining mechanism and the folding mechanism with one lever without deteriorating the appearance around the intermediate plate.

  In order to achieve the above object, according to the first aspect of the present invention, an intermediate plate is disposed between the rear end of the seat cushion and the lower end of the seat back, and the seat cushion and the intermediate plate are connected to each other with a first rotating shaft. The seatback and the intermediate plate are connected to each other so as to be rotatable about a center, and the second rotation shaft is connected to be rotatable, and one of the first rotation shaft and the second rotation shaft is connected. The first reclining mechanism that adjusts the angle of the seat back with respect to the seat cushion by rotating the seat back as a center, and the other one of the first rotating shaft and the second rotating shaft is the center. A vehicle seat reclining device comprising: a second reclining mechanism that causes the seat back to overlap the seat cushion by rotating the seat back. The first reclining mechanism is provided with a first lock mechanism for restricting rotation of the seat back, and the second reclining mechanism is provided with a second lock mechanism for restricting rotation of the seat back, First and second lock release levers for releasing the locked states of the first and second lock mechanisms are provided so as to be rotatable about the first and second rotation shafts. Each of the second unlocking levers is connected by a connecting link.

  According to the above configuration, during the unlocking operation, the first and second unlocking levers connected to each other by the connecting link rotate in conjunction with each other.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the length between the center of rotation of the unlocking lever in the first reclining mechanism and the coupling portion of the unlocking lever with the connecting link. Is configured to be shorter than the length between the center of rotation of the unlocking lever in the second reclining mechanism and the connecting portion of the unlocking lever with the connecting link.

  According to the above configuration, when the first and second lock release levers are rotated via the connection link, the length between the rotation center of the lock release lever and the link connecting portion is short. The rotation angle of the lock release lever in the reclining mechanism is larger than the rotation angle of the lock release lever in the second reclining mechanism, so that the unlocking of the first reclining mechanism is preceded, and the seat by the first reclining mechanism It is possible to perform the reclining operation in advance.

  According to a third aspect of the present invention, in the configuration of the first aspect of the invention, the first and second locking mechanisms include an internal gear of a rotating body provided on a seat back side or a seat cushion side, and the intermediate plate side. The lock tooth external gear provided rotatably is provided so as to be disengageable with each other, and the lock tooth is rotated by a cam that rotates as the first and second lock release levers rotate. The external gear and the internal gear of the rotating body are disengaged to release the lock, and a protrusion is provided on the lock tooth of the second locking mechanism, and an engaging step is provided on the rotating body of the second locking mechanism. And the protrusion engages with the engagement step portion in a state in which the external gear of the lock tooth and the internal gear of the rotating body are disengaged in the first and second lock mechanisms. To regulate the rotation of the front of the seat back, the unlocking of the second lock mechanism, it is constituted to delay than the unlocking of the first locking mechanism.

  According to the above configuration, when the first and second lock release levers are rotated via the connection link, the external tooth gear of the lock tooth of the first and second lock mechanisms and the internal gear of the rotating body Even if the meshing is disengaged, the projection of the lock tooth in the second locking mechanism engages with the engaging step portion of the rotating body, thereby restricting the rotation of the seat back in the forward folding direction, The unlocking of the locking mechanism is delayed from the unlocking of the first locking mechanism, and the seat back reclining operation by the first reclining mechanism can be performed in advance.

  According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the first and second lock release levers are unlocked by rotation in the same direction. The ends protruding to one side from the rotation center of the release lever are connected by the connecting link, and the lock release lever is released to the end protruding from the rotation center of the lock release lever to the other side in the first reclining mechanism. An operation lever that is rotated in the direction is connected, and the lock release lever is connected to the connection link by rotation in the release direction of the operation lever.

  According to the above configuration, by operating the operating lever, the end of the unlocking lever in the first reclining mechanism on the connecting part side to the connecting link moves with respect to the connecting link, and the lock in the first reclining mechanism Only the mechanism is unlocked.

  According to a fifth aspect of the present invention, a connection pin is provided in the lock release lever in the first reclining mechanism, and a long hole through which the connection pin can move is provided in the connection link.

  According to the above configuration, by operating the operation lever, the connecting pin of the unlocking lever in the first reclining mechanism moves with respect to the long hole of the connecting link, and only the locking mechanism in the first reclining mechanism is unlocked. Is made.

  According to the first aspect of the present invention, it is only necessary to provide a connection link for connecting the first and second lock release levers to each other, and an operation lever such as a lock release operation lever is provided on the intermediate plate. Since it is not necessary to provide it, the structure can be simplified, and even if the intermediate plate is covered with, for example, a resin cover, the resin cover can be made small, and deterioration of appearance can be prevented.

  According to the second aspect of the present invention, the unlocking lever of the first reclining mechanism can be rotated more greatly than the unlocking lever of the second reclining mechanism during the unlocking operation. The unlocking of the locking mechanism in the reclining mechanism can be performed prior to the unlocking of the locking mechanism of the second reclining mechanism, and the seat back can be folded after adjusting the angle of the seat back.

  According to the invention of claim 3, even when the lock is released because the engagement between the external gear of the lock tooth of the lock mechanism of the lock mechanism and the internal gear of the rotating body is released and the lock is released at the time of unlocking. In the lock mechanism in the reclining mechanism, the engagement between the external gear and the internal gear is disengaged, but the lock can be maintained by the protrusion coming into contact with the engagement step portion, so that the lock mechanism in the first reclining mechanism can be maintained. The lock can be released before the lock mechanism of the second reclining mechanism is unlocked, and the seat back can be folded after adjusting the angle of the seat back.

  According to the invention of claim 4, even if the operation lever is operated to rotate the lock release lever in the first reclining mechanism in the release direction, the connection portion of the lock release lever with respect to the connection link is Since it moves, rotation of the unlocking lever of the second reclining mechanism can be prevented, and only the first reclining mechanism can be operated.

  According to the invention of claim 5, when the operation lever is operated to rotate the lock release lever in the first reclining mechanism in the release direction, the connection pin of the lock release lever moves in the long hole of the connection link. Therefore, the operation of only the first reclining mechanism can be performed reliably.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a front sectional view showing a vehicle seat reclining device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. It is arrow sectional drawing. In this vehicle seat reclining device, an intermediate plate 5 is disposed between a frame (cushion frame) 1 of a seat cushion SC and a frame (back frame) 3 of a seat back SB.

  One end (lower end) of the intermediate plate 5 and the rear end of the cushion frame 1 are connected to be rotatable about the first rotation shaft 7 to form a first reclining mechanism 9. A second reclining mechanism 13 is configured by connecting the other end (upper end) and the lower end of the back frame 3 so as to be rotatable about the second rotation shaft 11.

  These reclining mechanisms 9 and 13 are respectively set on the left and right sides of the vehicle seat as shown in FIGS. 2 and 3, and the left and right first reclining mechanisms 9 and 9 are connected to each other by a connecting wire 15. The left and right second reclining mechanisms 13 and 13 are connected to each other by a connecting rod 17 and interlocked.

  Then, the first reclining mechanism 9 rotates the seat back SB with the intermediate plate 5 around the first rotation shaft 7 to adjust the angle of the seat back SB with respect to the seat cushion SC. Further, the seat back SB is rotated about the second rotation shaft 11 by the second reclining mechanism 13 in a state where the intermediate plate 5 is erected (tilted forward) as shown in FIGS. Thus, the seat back SB can be folded so as to be folded on the seat cushion SC. That is, the second reclining mechanism 13 constitutes a folding mechanism.

  The above-described first and second reclining mechanisms 9 and 13 include first and second reclining mechanisms 9 and 13 shown in FIG. 4 and FIG. 5 that are enlarged views of the left and right reclining mechanisms 9 and 13 in FIG. Each of the locking mechanisms 19 and 21 is provided, and in order to unlock the locking mechanisms 19 and 21 on one side, the first and second rotating shafts 7 and 11 have first and second rotating shafts, respectively. The lock release levers 23 and 25 are connected and fixed.

  As shown in FIG. 2, the first unlocking lever 23 includes a pair of end portions 23 a and 23 b that protrude in a direction away from the center portion fixed to the first rotating shaft 7, while the second unlocking lever. The lever 25 includes an end portion 25 a that protrudes in one direction from a central portion that is fixed to the second rotating shaft 11.

  Moreover, the 1st rotating shaft 7 shown in FIG. 2 protrudes outward as shown in FIG. 1, and the operation knob 27 is provided in this protrusion edge part. The first lock mechanism 19 is unlocked by grasping the operation knob 27 and rotating the first lock release lever 23 in the counterclockwise direction in FIG. 2 via the first rotation shaft 7.

  As shown in FIG. 2, a connecting pin 29 is provided at the one end 23 a of the first unlocking lever 23, and one end of the connecting wire 15 is connected to the connecting pin 29 via a connecting tool 31. It is. The other end of the connecting wire 15 is connected to a connecting pin 29 provided at one end 23a of the first unlocking lever 23 on the opposite side shown in FIG.

  Accordingly, by rotating the operation knob 27 in the counterclockwise direction in FIG. 2, the locks of the first lock mechanisms 19, 19 on both the left and right sides are released, and in this unlocked state, the seat By rotating the back SB together with the intermediate plate 5 about the first rotation shaft 7, the angle of the seaback 3 can be adjusted. At this time, the second lock mechanism 21 is in a locked state, the relative rotation between the seat back SB and the intermediate plate 5 does not occur, and the state shown in FIGS. 2 and 3 is maintained.

  In each of the first and second reclining mechanisms 9 and 13 on the left side shown in FIG. 2, a connecting pin 33 provided on the other end 23b of the first unlocking lever 23, and a second unlocking lever The connecting pins 35 provided at the end portions 25 a of the 25 are connected to each other by connecting links 37.

  Here, a long hole 37a is formed in a connecting portion of the connecting link 37 with the connecting pin 33 on the first unlocking lever 23 side, and the connecting pin 33 is movable in the long hole 37a. . This is because when the first lock release lever 23 is rotated counterclockwise in FIG. 2 by the operation of the operation knob 27 shown in FIG. This is because only one lock mechanism 19 can be unlocked.

  One end of the lock release cable 41 is connected to the connection pin 35 on the second reclining mechanism 13 side via a connection tool 39, and the other end of the lock release cable 41 is pulled out above the seat back SB. It is connected to a lock release lever (not shown) set on the back surface or upper end of the back SB.

  That is, by pulling the unlocking operation lever (not shown), the first and second unlocking levers 23 and 25 are rotated in the counterclockwise direction in FIG. Both the first and second lock mechanisms 19 and 21 are unlocked, and in this state, the seat back SB is folded.

  At this time, the first lock mechanism 19 needs to be unlocked first, and then the second lock mechanism 21 needs to be unlocked. This is because the seat back SB is folded forward while the intermediate plate 5 is raised by the first reclining mechanism 9.

  Therefore, as shown in the schematic diagram of FIG. 6B, the length between the first rotating shaft 7 and the connecting pin 33 that is a connecting portion between the first lock release lever 23 and the connecting link 37. A is made shorter than the length B between the 2nd rotating shaft 11, and the connection pin 35 which is a connection part of the 2nd lock release lever 25 and the connection link 37. FIG.

  As a result, when the unlocking operation lever (not shown) is grasped and the unlocking cable 41 is pulled in the direction indicated by the arrow C, the first and second unlocking levers 23 and 25 rotate together via the connecting link 37. Since the rotation angle of the first lock release lever 23 is larger than that of the second lock release lever 25, the first lock mechanism 19 is unlocked first, and then the second lock mechanism 21 is unlocked. Is made.

  6A and 6B show an initial state before unlocking, FIG. 6A corresponds to FIG. 3, and FIG. 6B corresponds to FIG.

  Hereinafter, FIGS. 7 to 9 sequentially show the operations when the unlocking operation lever is operated from the initial state of FIG. 6. In each figure, (a) corresponds to FIG. 3, and (b) This corresponds to FIG.

  When the unlocking lever (not shown) is operated and the unlocking cable 41 is pulled in the direction of arrow C from the initial state of FIG. 6, the first locking mechanism 19 is first unlocked as described above. At this time, the first and second lock release levers 23 and 25 rotate counterclockwise in FIG. 6B to be in the state of FIG. 7B.

  Accordingly, the first unlocking lever 23 in FIG. 6 (a) on the opposite side is also clockwise in FIG. 6 (a) by the same angle as the first unlocking lever 23 in FIG. 6 (b). While rotating, the second rotating shaft 11 in FIG. 6 (a) also rotates clockwise in FIG. 6 (a) by substantially the same angle as the second unlocking lever 25 in FIG. 6 (b).

  Accordingly, in the state shown in FIG. 7, the left and right first lock mechanisms 19 are unlocked, and in this state, the angle of the seat back SB can be adjusted around the first rotation shaft 7 together with the intermediate plate 5. .

  A return spring 42 is provided between the intermediate plate 5 and the frame 1 of the seat cushion SC to urge the seat back SB in the forward tilt direction, so that the left and right first lock mechanisms 19 are unlocked. Then, the intermediate plate 5 rotates to the foremost tilt position.

  When the unlocking operation lever is further operated and the unlocking cable 41 is pulled in the same direction from the unlocked state of the first locking mechanism 19 in FIG. 7, the first and second unlocking levers 23 and 25 are moved. FIG. 7B rotates counterclockwise to obtain the state of FIG. 8B.

  Accordingly, the first unlocking lever 23 in FIG. 7 (a) on the opposite side is also rotated clockwise in FIG. 7 (a) by substantially the same angle as the first unlocking lever 23 in FIG. 7 (b). While rotating, the second rotating shaft 11 in FIG. 7A also rotates clockwise in FIG. 7A by substantially the same angle as the second unlocking lever 25 in FIG. 7B.

  Thus, in the state shown in FIG. 8, the left and right second lock mechanisms 21 are unlocked, and in this state, the seat back SB can be pushed forward and folded on the seat cushion SC. When the seat back SB is folded on the seat cushion SC, the lock of the first locking mechanism 19 is released, so that in the state of FIG. 7, the intermediate plate 5 tilts forward as shown in FIG. It has moved to the standing state that is the position.

  Next, the first and second lock mechanisms 19 and 21 will be described. Each of the lock mechanisms 19 and 21 has the same basic structure, and will be described here using the second lock mechanism 21 in the second reclining mechanism 13 shown in FIG. FIG. 9 is an exploded perspective view showing only main components in the second lock mechanism 21.

  As shown in FIGS. 4 and 9, a cam 43 is fixed to the second rotating shaft 11, and the cam 43 is fixed to the right side of the intermediate plate 5 in FIG. It is housed between a lid 49 as a rotating body fixed to the arm plate 47 on the SB side. The outer peripheral side of the machine frame 45 and the lid body 49 is covered with a holder 51 shown in FIG. 4, so that the machine frame 45 and the lid body 49 are rotatably supported without being separated in the axial direction. .

  The lid 49 described above is fixed to the base plate 53 on the seat cushion SC side on the first locking mechanism 19 side in the first reclining mechanism 9.

  On the outer peripheral side of the cam 43 described above, a pair of lock teeth 55 are provided so as to be rotatable about a shaft portion 57 provided on the machine casing 45. An external gear 55 a is formed on the outer peripheral portion of the lock tooth 55, while an internal gear 49 a that can mesh with the external gear 55 a is formed on the inner peripheral portion of the lid 49.

  Then, by the rotation of the cam 43 described above, the lock tooth 55 is pressed to the outer peripheral side and rotates around the shaft portion 57, and the external gear 55 a meshes with the internal gear 49 a, so that the lid 49 is attached to the machine frame 45. Rotation is restricted. That is, the seat back SB on the arm plate 47 side to which the lid 49 is fixed is in a locked state in which the rotation is restricted with respect to the intermediate plate 5 to which the machine frame 45 is fixed.

  Further, on both sides of each lock tooth 55, guide protrusions 59 and 61 that guide the cam 43 during rotation are provided so as to protrude from the machine frame 45.

  In the first reclining mechanism 9, a return spring (not shown) is provided between the guide protrusion 59 corresponding to one lock tooth 55 and the guide protrusion 61 corresponding to the other lock tooth 55. This return spring urges the cam 43 in the direction in which the external gear 55 a meshes with the internal gear 49 a, and is similarly provided in the second reclining mechanism 13.

  Therefore, when the first locking mechanism 19 in the first reclining mechanism 9 is unlocked, the cam 43 resists the elastic force of the return spring as shown in FIG. It rotates in the direction of arrow D and is pushed by the cam 43, and the lock tooth 55 also rotates, the external gear 55a is separated from the internal gear 49a, and the meshing between the two gears 55a and 49a is released.

  Further, as shown in FIG. 9, the second locking mechanism 21 in the second reclining mechanism 13 is provided with a protrusion 55b that protrudes toward the lid 49 on the side surface in the vicinity of the external gear 55a of the lock tooth 55. ing. On the other hand, an engagement step portion 49b is provided on the inner side surface of the lid 49 closer to the center than the internal gear 49a, and the engagement step portion 49b serves as a boundary and is positioned on the center side on one side in the circumferential direction. A protrusion riding surface 49c is provided.

  The protrusion 55b of the lock tooth 55 rides on the protrusion riding surface 49c when the lock is released, so that the external gear 55a of the lock tooth 55 and the internal gear 49a of the lid 49 do not mesh with each other in a predetermined angle range. The state in which the protrusion 55b of the lock tooth 55 rides on the protrusion riding surface 49c is a state in which the seat back SB is tilted forward from the state in FIG. 2, and in this state, the lock of the second lock mechanism 21 is released. Become.

  When the seat back SB is tilted backward from the unlocked state (the seat back SB tilted forward with respect to the intermediate plate 5 from the state shown in FIG. 2), that is, the projection 55b rides on the projection riding surface 49c. Since the lid 49 rotates together with the seat back SB, the projection 55b slides on the projection riding surface 49c and then falls into the engagement step portion 49b. In this state, the seat back SB is restricted from rotating forward. It will be locked.

  On the other hand, the rearward rotation of the seat back SB at this time is caused by a notch step provided on the intermediate plate 5 by a stopper 63 fixed to the arm plate 47 on the seat back SB side, as shown in FIGS. It abuts on the part 5a and regulates.

  Instead of providing the notch step portion 5a on the intermediate plate 5, a separate regulating member may be fixed by welding or the like.

  According to the first embodiment described above, the first and second unlocking levers 23 and 25 connected to each other by the connecting link 37 by pulling the cable 41 by operating an unlocking operating lever (not shown). Is rotated so that both the first and second lock mechanisms 19 and 21 can be released.

  At this time, only the connection link 37 is provided between the first and second lock release levers 23 and 25, and the intermediate plate 5 is provided with an operation lever such as a lock release operation lever. Since it is not necessary, the structure can be simplified, and even if the intermediate plate 5 is covered with, for example, a resin cover, the resin cover can be made small, and deterioration of appearance can be prevented.

  Further, the unlocking operation lever, the second unlocking lever 25, and the first unlocking lever 23 are connected in series in this order, but the operation of the unlocking operation lever is more than the second reclining device. The first reclining device can be unlocked in advance.

  Therefore, the intermediate plate 5 can be moved to the upright position (frontmost tilt position) by one operation of the unlocking operation lever, and then the seat back SB can be folded. That is, even when the seat back SB is at an arbitrary angular position, the seat back SB can be folded up to a horizontal position by a single operation of the unlocking lever on the seat back SB side, so that the operability is good and the usability is good. Very good.

  In the first embodiment, since the second reclining device on the folding mechanism side employs the same configuration as the first reclining device, the lock strength can be increased, and the reclining device The strength of can be guaranteed.

  FIG. 10 shows a second embodiment of the present invention. In the first embodiment, the length A of the first unlocking lever 23 in FIG. 6 is set to the second unlocking so that the first locking mechanism 19 can be unlocked before the second locking mechanism 21. Although it is shorter than the length B of the lever 25, in this embodiment, the engaging step portion 49b of the lid body 49 and the protrusion riding surface 49c are formed inwardly higher, and the external gear 55a of the lock tooth 55 is formed of the lid body. 49, even if the meshing of the internal gear 49a is disengaged, the protrusion 55b of the lock tooth 55 abuts against the engaging step portion 49b to restrict the rotation of the lid body 49, that is, the forward rotation of the seat back SB. Yes.

  That is, even when the external gear 55a and the internal gear 49a of the first lock mechanism 19 are disengaged and the lock is released when the lock is released, the second lock mechanism 21 has the external gear 55a and the internal gear. Although the meshing with the gear 49a is released, the locked state can be maintained by the protrusion 55b coming into contact with the engaging step portion 49b.

  Then, by further pulling the lock release cable 41 and rotating the lock tooth 55 from this state, the projection 55b rides on the projection riding surface 49c, and the lock of the second lock mechanism 21 is also released. In this state, the seat back SB Can be folded forward.

  In the second embodiment, the length A of the first lock release lever 23 is substantially the same as the length B of the second lock release lever 25, but the same as in the first embodiment. In addition, the length A of the first lock release lever 23 may be shorter than the length B of the second lock release lever 25.

  In the second embodiment described above, similarly to the first embodiment, the structure can be simplified and the appearance can be prevented from deteriorating. Further, in this embodiment, the position of the protrusion riding surface 49c of the lid 49 is changed so as to be closer to the center side, and the connection plate 37 is mainly added to the existing reclining mechanism provided with the folding mechanism. Therefore, the strength as a reclining device can be guaranteed.

1 is a front sectional view showing a vehicle seat reclining device according to a first embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is BB arrow sectional drawing of FIG. It is sectional drawing to which the reclining mechanism periphery of the right side in FIG. 1 was expanded. It is sectional drawing to which the left reclining mechanism periphery was expanded in FIG. FIGS. 3A and 3B are schematic diagrams of a lock mechanism showing an initial state before unlocking in the first embodiment, where FIG. 3A corresponds to FIG. 3 and FIG. 2B corresponds to FIG. FIGS. 3A and 3B are schematic views of a lock mechanism showing a state in which the lock of the first reclining mechanism in the first embodiment is released, in which FIG. 3A corresponds to FIG. 3 and FIG. 2B corresponds to FIG. FIGS. 3A and 3B are schematic diagrams of a lock mechanism showing a state in which the lock of the second reclining mechanism in the first embodiment is released, in which FIG. 3A corresponds to FIG. 3 and FIG. It is a disassembled perspective view of the locking mechanism in 1st Embodiment. It is sectional drawing which shows the inside of the locking mechanism concerning 2nd Embodiment of this invention.

Explanation of symbols

SC seat cushion SB seat back 5 intermediate plate 7 first rotating shaft 9 first reclining mechanism 11 second rotating shaft 13 second reclining mechanism 19 first locking mechanism 21 second locking mechanism 23 first lock Release lever 25 Second lock release lever 33 Connection pin 37 Connection link 37a Long hole 43 Cam 49 Lid (rotary body)
49a Internal gear 49b Engagement step 55 Lock tooth 55a External gear 55b Protrusion

Claims (5)

  An intermediate plate is disposed between the rear end of the seat cushion and the lower end of the seat back, and the seat cushion and the intermediate plate are coupled to be rotatable about a first rotation axis, and the seat back and the middle A plate is connected to a plate so as to be rotatable by a second rotation shaft, and the seat back is rotated around one of the first rotation shaft and the second rotation shaft, whereby the seat back is seated. The seat back is turned into a seat cushion by rotating the seat back around the other one of the first rotation shaft and the second rotation shaft, and a first reclining mechanism for adjusting the angle with respect to the cushion. In a vehicle seat reclining device including a second reclining mechanism for superimposing, a first reclining mechanism is provided in front of the first reclining mechanism. A first lock mechanism that restricts the rotation of the seat back is provided, and a second lock mechanism that restricts the rotation of the seat back is provided in the second reclining mechanism, and each of the first and second lock mechanisms is provided. First and second unlocking levers for releasing the locked state are provided to be rotatable around the first and second rotating shafts, and the first and second unlocking levers are connected to each other. A vehicle seat reclining device characterized by being connected by a link.   The length between the rotation center of the unlocking lever in the first reclining mechanism and the coupling portion of the unlocking lever with the connecting link is defined as the rotation center of the unlocking lever in the second reclining mechanism. 2. The vehicle seat reclining device according to claim 1, wherein the length of the lock release lever is shorter than a length between the connection portion of the lock release lever and the connecting link.   Each of the first and second locking mechanisms includes an internal gear of a rotating body provided on the seat back side or the seat cushion side and an external gear of a lock tooth provided rotatably on the intermediate plate side. The lock tooth is rotated by a cam that rotates as the first and second lock release levers rotate, and the external gear of the lock tooth and the internal gear of the rotating body are disengaged. The lock tooth of the second lock mechanism is provided with a protrusion, and the rotating body of the second lock mechanism is provided with an engaging step, so that the lock tooth in each of the first and second lock mechanisms is provided. The protrusion engages with the engagement step portion in a state in which the external gear of the rotary gear and the internal gear of the rotating body are disengaged, and the second rotation of the seat back is restricted. Unlocking of the lock mechanism, said first seat reclining apparatus according to claim 1, wherein a delaying from unlocking the lock mechanism.   The first and second unlocking levers are unlocked by rotation in the same direction, and the ends protruding from the rotation center of each unlocking lever to one side are connected by the connecting link, An operation lever for rotating the lock release lever in the release direction is connected to an end portion of the first reclining mechanism that protrudes from the rotation center of the lock release lever to the other side. The vehicle seat reclining device according to any one of claims 1 to 3, wherein the lock release lever is connected so as to be movable with respect to the connection link.   5. The vehicle seat reclining device according to claim 4, wherein a connection pin is provided in the lock release lever in the first reclining mechanism, and a long hole through which the connection pin can move is provided in the connection link.

Images