JP4661361B2 - Seat reclining device - Google Patents

Description

  The present invention relates to a seat reclining device. More specifically, the present invention relates to a seat reclining device having a reclining memory function capable of tilting a seat back in a state where an angle position before tilting is stored.

A reclining function capable of tilting (backward tilting) a seat back at an arbitrary angle is often used in front seats of automobiles. In addition, a seat device with a reclining function is known which has a reclining memory function capable of storing the reclining angle before the forward tilt when the seat back is tilted forward by a walk-in operation or the like.
In such a seat reclining device having a reclining memory function, if the reclining lock operating member is operated after operating the reclining memory operating member, the reclining memory may not function normally. Specifically, a ratchet that can rotate relative to both the seat back and the seat cushion is provided, and the reclining lock mechanism restricts (locks) and allows (unlocks) the relative rotation of the ratchet with respect to the seat cushion. The reclining memory mechanism restricts (rotates the memory) and allows (memory operation) the relative rotation of the ratchet with respect to the seat back. Here, if the reclining memory mechanism is in the memory operating state and the reclining lock mechanism is in the unlocked state, the ratchet can rotate with respect to both the seat cushion and the seat back, and the angular position may be out of order. There is.
Accordingly, the present applicants have previously proposed a technique that can prevent the above-described problems with an inexpensive and simple structure (Japanese Patent Application No. 2005-127621). The contents of the seat reclining device having the reclining lock mechanism and the reclining memory mechanism are configured to restrict the reclining lock from being released when the reclining memory is operated. In this seat reclining device, a first rotation regulating member that rotates coaxially with the unlock operation handle, and a memory operation lever that rotates according to the operation of the memory operation member rotate coaxially with the second rotation restricting member. A rotation restricting member. When the release operation of the memory operation member is performed, the second rotation restricting member rotates and advances to a position where it engages with the first rotation restricting member. This restricts the reclining lock release operation from being performed.
In addition, the technique relevant to the said technique is disclosed by the following patent document 1, for example.

JP 2004-330991 A

However, in the above-described conventional technique, that is, a technique for restricting the reclining lock from being released when the reclining memory is operated, an unlock operation handle for operating the reclining lock mechanism, a memory operation member for operating the reclining memory mechanism, In the course of the operation, there is a risk of causing problems in the operation.
That is, according to the seat reclining device having the above-described configuration, the reclining lock releasing operation can be regulated by engaging the first rotation regulating member and the second rotation regulating member. In this case, by stopping the release operation of the memory operation member, the first rotation restricting member can be rotated to a position where it does not engage with the second rotation restricting member and retracted. However, for example, when the operation of the memory operation member and the operation of the unlock operation handle are continuously performed, the first rotation restricting member and the second rotation restricting member may In some cases, the relative positional relationship is reversed. In such a case, even if the release operation of the memory operation member is stopped, the first rotation restricting member and the second rotation restricting member are engaged, and the memory operation member cannot be returned to the position before the reverse rotation. There was a problem.

  The present invention was devised as a solution to the above-described problems, and the problems to be solved by the present invention are an unlock operation handle for operating the reclining lock mechanism, and a memory operation for operating the reclining memory mechanism. It is to eliminate the problems that occur during the operation of the member.

In order to solve the above problems, the seat reclining device of the present invention takes the following means.
First, a first invention includes a seat back that can tilt with respect to a seat cushion, a reclining lock mechanism that can be switched between a locked state that restricts tilting of the seat back and an unlocked state that releases the regulation, and a reclining lock mechanism; Independently, a reclining memory mechanism capable of memorizing the angle before tilting and enabling the seat back to tilt and a memory releasing operation for canceling the memory operating state, and a reclining lock mechanism by rotating operation. An unlock operation handle to be unlocked, a pivot shaft parallel to the pivot shaft of the unlock operation handle, and a memory operation position and a memory release position of the reclining memory mechanism according to the operation of the memory operation member. The memory control lever that is pivoted to the pivot and the unlocking operation handle are pivoted integrally. 1 pivot restricting member and a pivot shaft that is coaxial or parallel to the pivot shaft of the memory control lever, and can be relatively pivoted relative to the memory control lever in one direction. However, it is integrally rotated for the relative separation rotation in the other direction, and is normally biased and held by the biasing means so that the memory operation of the reclining memory mechanism by the memory operation member is performed. And a second rotation restricting member that is set to a relative rotation direction in the other direction during the operation for setting the position, and when the memory control lever is in the memory operating position, When the movement restricting member advances to the engagement position with the first turning restricting member to restrict the unlock turning operation of the unlocking operation handle, and the memory control lever is in the memory releasing position, the second turning The restriction member is connected to the first rotation restriction member. The first rotation restricting member and the second rotation restricting member are configured to permit the unlocking operation of the unlock operation handle by retracting from the combined position, and depending on the operation state of the memory operation member and the unlock operation handle. The second rotation restricting member is operated by operating the memory operating member to rotate the memory control lever from the memory operating position toward the memory releasing position when the relative positional relationship with the member is reversed. The rotation with respect to the memory control lever is a relative separation rotation in one direction, the relative rotation is performed, the reversely engaged state with the first rotation regulating member is avoided, and the first rotation regulation is performed. The relative positional relationship between the member and the second rotation restricting member is returned to the normal positional relationship state.
According to this first aspect, when the relative positional relationship between the first rotation restricting member and the second rotation restricting member is reversed, the memory control lever is moved from the memory operating position to the memory release position. By operating the memory operation member so as to rotate toward the second position, the second rotation restricting member relatively rotates in one direction, and the engagement with the first rotation restricting member is avoided. As a result, the memory operation member is returned to the normal positional relationship before the relative positional relationship between the first rotation restricting member and the second rotation restricting member is reversed.

Next, the second invention includes a ratchet that is connected to the seat cushion and the seat back so as to be rotatable relative to each other in the same manner as the tilt center of the seat back. The relative rotation of the ratchet with respect to the seat cushion is restricted, and the restriction is released by the unlocking operation of the unlocking operation handle. The reclining memory mechanism is pivotally supported on the seat back side, and is engaged with and disengaged from the ratchet. The memory control lever engages the pawl and the ratchet at the memory release position and releases the engagement at the memory operating position.
According to the second aspect of the invention, the reclining lock mechanism is switched between a state in which the relative rotation of the ratchet with respect to the seat cushion is restricted and a state in which it is allowed by the operation state of the unlock operation handle. Further, the reclining memory mechanism is switched between a state where the relative rotation of the ratchet with respect to the seat back is restricted and a state where it is allowed depending on the operation state of the memory operation member. Specifically, when the memory control lever is at the memory release position, the pawl and the ratchet are engaged to restrict the relative rotation. Further, at the memory operating position, the engagement between the pawl and the ratchet is released and the relative rotation is allowed.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect, the positional relationship when the relative positional relationship between the first rotation restricting member and the second rotation restricting member is reversed by a simple and inexpensive structure is reversed. Can be easily returned to normal condition. Thereby, the malfunction which arises in the process of operation of an unlocking operation handle and a memory operation member can be eliminated.
Furthermore, according to the second invention, it is possible to configure a reclining memory mechanism that functions to store the angle before tilting the seat back independently of the reclining lock mechanism with a simple and inexpensive structure.

  FIG. 1 shows a front seat 11 of an automobile. The seat 11 includes a seat cushion 12 that supports a seat occupant's hip and a seat back 13 that supports a seat occupant's back. The seat 11 is supported by a known slide mechanism so as to be able to advance and retreat in the front-rear direction with respect to the floor surface 14 of the vehicle. The seat back 13 is supported so as to be able to tilt backward from the standing position 13A to the maximum backward tilt position 13B with the seat back rotation center axis 13X as the center. The seat back 13 can also rotate to a forward tilt position 13C ahead of the standing position 13A with the seat back rotation center axis 13X as the center.

  As shown in FIG. 2, a seat cushion frame 15 that forms the skeleton of the seat cushion 12 and a seat back frame 16 that forms the skeleton of the seat back 13 are provided inside the seat 11. A pair of left and right seat cushion frames 15 and seat back frames 16 are provided, but only those on the right side of the seat are shown in FIG. In the following, the structure and operation of the reclining lock mechanism and the reclining memory mechanism will be described with reference to the illustrated right side of the seat, but the same reclining lock mechanism and reclining memory mechanism (not shown) are also provided on the left side of the seat. Yes. In the following description, the clockwise direction and the counterclockwise direction refer to the rotation direction of the member when viewed along the arrow T in FIG.

  A lower arm 21 shown in FIG. 7 is fixed in the vicinity of the rear end portion of the seat cushion frame 15, and a hinge pin 19 is fitted to the lower arm 21 so as to be relatively rotatable. The axis of the hinge pin 19 coincides with the seat back rotation center axis 13X. The hinge pin 19 has a hinge cam 19a that rotates integrally. A cam arm (not shown) projects from the hinge cam 19a in the radial direction. The lower arm 21 is provided with a slide cam 23 that is positioned outside the hinge cam 19a and supported so as to be linearly movable in the radial direction with respect to the seat back rotation center shaft 13X. The slide cam 23 is moved back and forth by the cam arm 19a. The lower arm 21 further supports a pair of slide poles 22 that can move straight in a radial direction substantially orthogonal to the moving direction of the slide cam 23. A cam mechanism (not shown) is formed on the opposed surfaces of the slide pole 22 and the slide cam 23. When the slide cam 23 moves forward and backward, the pair of slide poles 22 moves forward and backward by the action of the cam mechanism. Specifically, according to the forward / reverse movement of the slide cam 23, the pair of slide poles 22 moves away from the seatback rotation center axis 13X and moves toward the seatback rotation center axis 13X. Do. In addition, an annular lock plate 20 that is rotatable relative to the lower arm 21 around the seatback rotation center axis 13X is supported inside the lower arm 21.

  The inner edge portion of the lock plate 20 and the outer edge portion of the slide pole 22 are opposed to each other, and locking teeth (inner teeth and outer teeth) are formed in areas facing each other. The slide cam 23 moves the pair of slide poles 22 in a direction in which the locking teeth mesh with each other (moving away from the seat back rotation center shaft 13X) by moving in the locking direction, and in an unlocking direction opposite to this. As a result of the movement of the slide cam 23, the pair of slide poles 22 are moved in the direction in which the engagement of the locking teeth is released (in the direction approaching the seat back rotation center axis 13X). Since each slide pole 22 is supported so as to only move (not rotate) in the radial direction with respect to the lower arm 21, the lower arm 21 is in a locked state where the locking teeth of the lock plate 20 and the slide pole 22 mesh with each other. In contrast, the rotation of the lock plate 20 is restricted. On the other hand, in the unlocked state where the engagement of the locking teeth is released, the lock plate 20 can be rotated relative to the lower arm 21. That is, the locked state and the unlocked state of the lock plate 20 with respect to the lower arm 21 are switched by the forward and reverse rotation of the hinge pin 19. The hinge pin 19 is urged to rotate in the locking direction by a spiral spring (lock urging spring) 24, and a reclining handle (unlock operation handle) 25 fixed to the hinge pin 19 is operated to rotate, thereby causing the spiral spring. It can be rotated in the unlocking direction against the urging force of 24. Specifically, the reclining handle 25 can reciprocate between the locked position shown in FIGS. 3, 5, and 6 and the unlocked position shown in FIG. 4, and resists the urging force of the spiral spring 24. Thus, the reclining handle 25 is rotated in the clockwise direction from the locked position to the unlocked position, thereby entering the unlocked state. The hinge pin 19, the lock plate 20, the lower arm 21, the slide pole 22, the slide cam 23, the spiral spring 24, and the reclining handle 25 constitute a reclining lock mechanism that restricts the tilt of the seat back 13 from the seat cushion frame 15 side. Yes. More specifically, the reclining handle 25 constitutes an unlocking operation member for releasing the locked state by the reclining lock mechanism.

  A ratchet 30 is coupled to the lock plate 20 so as not to rotate relative to the lock plate 20, and the ratchet 30 has a seat back rotation center shaft 13 </ b> X with respect to a circular hole formed near the lower end of the seat back frame 16. It is fitted as a center so that it can rotate relative to each other. The seat back frame 16 is urged by a return spring 26 shown in FIG. 7 in a direction in which the seat back 13 is tilted forward (counterclockwise direction in FIGS. 3 to 6).

  As shown in FIG. 2, a pair of memory recesses 30 a are formed on the outer edge of the ratchet 30. A pole 32 is pivotally mounted on the seat back frame 16 above the ratchet 30 via a rotation shaft 32X, and a pair of memory protrusions 32a provided near the tip of the pole 32 is provided with a pair of memory recesses in the ratchet 30. It can be engaged and disengaged with respect to 30a. The pole 32 further includes an interlocking pin 32b protruding in a direction parallel to the seat back rotation central axis 13X, and a cam surface 32c formed as a part of an outer edge portion following the memory protrusion 32a.

  Above the pole 32, a release lever (memory control lever) 33 is pivotally attached by a rotation shaft 33X. The pivot shaft 33X and the pivot shaft 32X of the pole 32 are parallel to the axis of the hinge pin 19, respectively. Therefore, the reclining handle 25, the pole 32, and the release lever 33 are pivoted by pivot center axes that are parallel to each other. The release lever 33 includes an arc-shaped pin insertion hole 33a, a sub arm 33b that rotates integrally with the release lever 33 main body, and a spring hook arm 33c. The interlocking pin 32b of the pole 32 is inserted into the pin insertion hole 33a, and the cam surface 32c of the pole 32 is located on the rotation trajectory of the sub arm 33b. Further, a tension spring 34 is stretched between the spring hook arm 33c and the spring hook portion 16a on the seat back frame 16, and the release lever 33 is rotated counterclockwise in FIGS. Is urged to rotate. This biasing direction is a direction in which the sub arm 33b pushes down the cam surface 32c. Therefore, when the release lever 33 is in a free state, the pawl 32 engages the memory protrusion 32a with the memory recess 30a by the biasing force of the tension spring 34. Held in an angular position. The angular position of the release lever 33 that engages the memory protrusion 32a and the memory recess 30a is referred to as a memory release position.

  The release lever 33 further has a wire connection arm 33d extending in the radial direction around the rotation shaft 33X, and one end of the memory operation wire 35 is connected to the wire connection arm 33d. When the memory operation wire 35 is pulled, the release lever 33 is rotated in the clockwise direction (in FIGS. 3 to 6) against the tension spring 34. Then, the sub arm 33b retracts from the cam surface 32c and releases the pressure on the pole 32. At the same time, the pin insertion hole 33a presses the interlocking pin 32b away from the ratchet 30 (upward in FIGS. 3 to 6). The pole 32 is rotated counterclockwise in FIGS. 3 to 6 to disengage the memory protrusion 32a from the memory recess 30a. The angular position of the release lever 33 that releases the engagement between the memory protrusion 32a and the memory recess 30a is referred to as a memory operating position.

  As shown in FIG. 2, the other end portion of the memory operation wire 35 is connected to a wire connection portion 37 a of a memory operation handle (memory operation member) 37 provided near the upper end portion of the seat back 13. The memory operation handle 37 is pivotally supported by the bracket 38 via a rotation shaft 37X at a position eccentric from the wire connection portion 37a, and the non-operation position shown in FIG. 2 and the direction of the arrow M in FIG. It is possible to reciprocately rotate between the memory operation positions rotated to the right. The memory operation handle 37 is urged to rotate to a non-operation position by a tension spring 39.

  When the memory operation handle 37 is rotated from the non-operation position in FIG. 2 to the memory operation position (in the direction of arrow M), the memory operation wire 35 is pulled, and the release lever 33 is moved against the tension spring 34 in FIG. It is rotated in the turning direction, that is, the memory operating position. Then, as described above, the pole 32 is rotated counterclockwise in FIG. 3, and the memory protrusion 32a is disengaged from the memory recess 30a. Although details will be described later, the disengaged state of the memory protrusion 32a is a memory operating state in which the angle of the seat back 13 is stored, and conversely, the engagement state of the memory protrusion 32a and the memory recess 30a is a memory released state.

  That is, the ratchet 30, the pawl 32, the release lever 33, and the memory operation handle 37 constitute a reclining memory mechanism that enables the seat back 13 to be tilted in a state where the angle before the tilt is stored. More specifically, the memory operation handle 37 constitutes a memory operation member for causing the memory operation state. The ratchet 30 constitutes a reclining memory mechanism in a broad sense, but can also be said to be an intermediate rotation member provided between the seat cushion frame 15 and the seat back frame 16. That is, with respect to the seat cushion frame 15 (lower arm 21), the ratchet 30 is switched by the reclining lock mechanism between an unlocked state in which relative rotation is possible and a locked state in which relative rotation is impossible. Further, the ratchet 30 with respect to the seat back frame 16 is switched between a memory operation state in which relative rotation is possible and a memory release state in which relative rotation is impossible due to the reclining memory mechanism.

  Although the reclining lock mechanism and the reclining memory mechanism are described as being provided on the left and right sides of the seat, the reclining handle 25 and the memory operating handle 37 that are operating members are shown on the right side of the seat shown in FIG. It is provided only on the left side, not on the left side. However, the hinge pin 19 on the right side of the seat is configured to interlock with the corresponding hinge pin on the left side of the seat. When the reclining handle 25 is turned in the unlocking direction, the above-described reclining lock mechanism is also provided on the left side of the seat. Unlocking (unlocking of the locking teeth) occurs. Further, the memory operation wire 40 is connected to the memory operation handle 37 with respect to a wire connection arm 37b provided at a position different from the wire connection portion 37a. The memory operation wire 40 is reclining on the left side of the seat (not shown). The memory mechanism functions similarly to the memory operation wire 35.

The seat 11 according to the present embodiment includes an operation restricting unit that restricts the unlocking / rotating operation of the reclining handle 25 when the memory operating handle 37 is operated to the memory operating position. The operation restricting means includes a first restricting lever (first turning restricting member) 50 that rotates coaxially with the reclining handle 25, and a second restricting lever (second rotating shaft coaxially supported with the release lever 33). (Rotation restricting member) 51. As shown in FIGS. 2 to 6, the first restriction lever 50 has a substantially U-shape, and has a fixing hole 50 a into which the hinge pin 19 is inserted and fixed at one end, and the rotation restriction at the other end. It has an arm 50b. The second restriction lever 51 includes a rotation shaft hole 51a that is rotatably fitted to the rotation shaft 33X of the release lever 33, and a fixed arm 51b that extends along the wire connection arm 33d of the release lever 33. The fixed arm 51b has a rotation restricting arm 51c that extends in a different direction.
6 and 9, the distal end portion of the fixed arm 51b of the second regulating lever 51 is a connecting portion 51d that is connected to the release lever 33. The connecting portion 51d is formed as a substantially inverted U-shaped engagement hole as seen in the figure, and is formed so that one end is open in the illustrated case. A fixing pin 33Y formed integrally with the release lever 33 is arranged in a state in which it can be fitted to the connecting portion 51d of the engaging hole having one end opened. Accordingly, as shown in the drawing, the fixing arm 51b of the second regulating lever 51 is integrated with respect to the relative rotation in the counterclockwise direction with respect to the release lever 33 from the state where the fixing pin 33Y is fitted to the connecting portion 51d. However, it is possible to turn away from the relative rotation in the clockwise direction. That is, the connection between the connecting portion 51d and the fixing pin 33Y can be separated with respect to the relative separation rotation in one direction, but with respect to the relative separation rotation in the other direction. It is considered as a single rotation.
A spiral spring (biasing means: not shown) that biases the second regulating lever 51 counterclockwise with respect to the release lever 33 is provided between the second regulating lever 51 and the release lever 33. It is connected. The second restricting lever 51 is elastically held at a position in contact with the fixing pin 33Y by this turning biasing force. As a result, as shown in FIGS. 3 to 6, the second regulating lever 51 and the release lever 33 are integrated with each other so as not to rotate relative to the clockwise rotation of the release lever 33. It is rotated coaxially around the rotation shaft 33X. Further, as shown in FIG. 9, the second regulating lever 51 rotates independently of the release lever 33 against the urging force of the spiral spring with respect to the clockwise rotation with respect to the release lever 33. It can be relatively rotated about the moving shaft 33X.

  As shown in FIGS. 2 and 7, the distal end portion of the rotation restricting arm 50 b is a folded engagement portion 50 c that is bent substantially at a right angle, and the first restricting lever 50 and the reclining handle 25 are turned. The rotation locus RE of the outer edge portion of the folding engagement portion 50c is shown by a two-dot chain line in FIGS. The second restricting lever 51 that rotates integrally with the release lever 33 causes the turning restricting arm 51c to enter the inside of the outer edge turning locus RE in accordance with the forward / reverse rotation of the release lever 33, and the folding engagement portion. The operation restricting position (FIG. 6) to be engaged with 50c and the operation permitting position (FIG. 3, FIG. 3) for retracting the rotation restricting arm 51c to the outside of the outer edge turning locus RE and releasing the engagement with the folding engagement portion 50c. 4 and 5).

  The above sheet apparatus operates as follows. When neither the reclining handle 25 nor the memory operation handle 37 is operated, the operation restricting means is in the state shown in FIG. In this state, the rotation restricting arm 51c of the second restricting lever 51 is retracted from the outer edge turning locus RE of the folding engagement portion 50c of the first restricting lever 50, so that the first restricting lever 50 is turned. Without being restricted, it is possible to rotate the reclining handle 25 together with the first regulating lever 50 in the clockwise direction (unlock direction) in the drawing.

  When the handles 25 and 37 in FIG. 3 are not operated, the reclining lock mechanism restricts the rotation of the lock plate 20 with respect to the seat cushion frame 15 (lower arm 21). On the other hand, on the seat back frame 16 side, a pair of memory protrusions 32 a provided on the pole 32 are engaged with a pair of memory recesses 30 a of the ratchet 30 coupled to the lock plate 21. The release lever 33 is held at the memory release position where the sub arm 33b presses the cam surface 32c by the urging force of the tension spring 34, and the state where the memory protrusion 32a is engaged with the memory recess 30a is maintained by the urging force. The That is, the lock plate 21, the ratchet 30, and the seat back frame 16 (the pole 32) are integrally locked so as not to rotate around the seat back rotation center axis 13X. Operation is restricted.

  When the reclining handle 25 is rotated in the unlocking direction from the position of FIG. 3 to the position of FIG. 4, the slide cam 23 is moved in the unlocking direction via the hinge pin 19, and the slide pole 22 is engaged with the lock plate 20. It is moved to the release position (direction approaching the seat back rotation center axis 13X). On the other hand, since the engagement state of the memory protrusion 32a and the memory recess 30a is maintained by the urging force of the tension spring 34, the ratchet 30 is integrated with the seat back frame 16 via the pole 32 (relative rotation is not possible). Regulated). Therefore, the combined body of the lock plate 20, the ratchet 30 and the seat back frame 16 can be integrally rotated relative to the lower arm 21 around the seat back rotation center axis 13 </ b> X. In this unlocked state, the rearward tilt angle of the seat back 13 can be arbitrarily adjusted between the standing position 13A and the maximum rearward tilt position 13B shown in FIG. After the adjustment of the tilt angle after the seat back, if the hand is released from the reclining handle 25, the reverse operation occurs and the seat back 13 is locked again, and the reclining handle 25 is unlocked as shown in FIG. Return to position.

  If the seat back 13 is not held or tilted backward when the reclining handle 25 is used to unlock the reclining lock mechanism, the seat back 13 is brought to the forward tilt position 13C shown in FIG. FIG. 4 shows this state. The reclining lock mechanism is configured such that when the seat back 13 is in the forward tilt position 13C, the lock plate 20 and the slide pole 22 are not engaged even if the hand is released from the reclining handle 25. In the forward tilt state, the reclining handle 25 is kept in the unlocking operation position as shown in FIG.

  On the other hand, when the memory operation is performed by the memory operation handle 37 from the state of FIG. 3 during the walk-in operation or the like, the operation is as shown in FIG. When the memory operation handle 37 is rotated from the non-operation position in FIG. 2 to the memory operation position in the direction of arrow M in FIG. 2, the memory operation wire 35 is pulled and the release lever 33 resists the tension spring 34. It rotates clockwise, that is, to the memory operating position. Then, the pin insertion hole 33a lifts the interlocking pin 32b, and the pole 32 is rotated counterclockwise in FIG. 3, and the engagement of the memory protrusion 32a and the memory recess 30a is released. Thereby, the coupling relationship between the ratchet 30 and the seat back frame 16 is released, and the seat back frame 16 can be rotated relative to the ratchet 30. Further, the memory operation wire 40 is pulled by the operation of the memory operation handle 37, and the seat back frame can be rotated relative to the ratchet also in the reclining memory mechanism on the left side of the seat. On the other hand, since the lock plate 20 maintains meshing with the slide pole 22 (the reclining lock mechanism maintains the locked state), the ratchet 30 remains in a state where the rotation is restricted.

  Therefore, the seat back 13 can tilt by the relative rotation of the seat back frame 16 with respect to the ratchet 30 whose rotation is restricted. For example, when the hand is released from the seat back 13 in this memory operating state, the seat back 13 falls forward due to the urging force of the return spring 26. When the seat back 13 is raised, the seat back 13 is locked at the same angle as when the above reclining memory operation is performed. Specifically, when the seat back frame 16 that has been tilted forward relative to the ratchet 30 that is restricted from rotating is relatively rotated in the upright direction, the memory protrusion 32a is formed in the memory recess in the circumferential direction of the ratchet 30. Approaching 30a. When the seat back frame 16 is rotated to a position where the pair of memory protrusions 32a face the pair of memory recesses 30a, the pole 32 is rotated by the urging force of the tension spring 34, and each memory protrusion 32a is moved to the memory recess 30a. Engage with. As a result, the relative rotation of the ratchet 30 and the pole 32 is restricted, and the seat back frame 16 cannot tilt again with respect to the lower arm 21. Since the ratchet 30 has not been rotated with respect to the seat cushion frame 15 from the beginning of the operation of the memory operation handle 37, the rotation-restricted position is the stored angle of the seat back 13.

In the reclining memory mechanism, when the release lever 33 is rotated in the clockwise direction from the memory release position in FIG. 3 to the memory operation position in FIG. 6, the second restriction lever 51 is rotated integrally with the release lever 33. Then, the rotation restricting arm 51c of the second restricting lever 51 advances to the inside of the outer edge turning locus RE of the folding engagement portion 50c of the first restricting lever 50, and the first restricting lever 50 is moved clockwise in FIG. When it is going to rotate, the said rotation is controlled by engagement of the folding | returning engagement part 50c and the rotation control arm 51c. Since the first regulating lever 50 is a member that rotates integrally with the reclining handle 25, as a result, the reclining handle 25 cannot be rotated in the unlocking direction (clockwise direction in FIG. 6). When the pulling of the memory operation wire 35 by the memory operation handle 37 is released and the release lever 33 returns to the memory release position in FIG. 3, the rotation restriction arm 51 c of the second restriction lever 51 turns the first restriction lever 50 back. The recliner handle 25 can be operated again because it retreats outside the outer edge rotation locus RE of the joint portion 50c.
In addition, as shown in FIG. 8, when some sort of trigger causes the relative positional relationship between the first regulating lever 50 and the second regulating lever 51 to be reversed in the course of the above operation, the memory By releasing the pulling of the memory operation wire 35 by the operation handle 37, the normal positional relationship state before the relative positional relationship between the two is reversed is restored. That is, first, as shown by the solid line in FIG. 9, when the release lever 33 is rotated counterclockwise by releasing the pulling of the memory operation wire 35, the second regulating lever 51 is biased by the spiral spring. As a result, it rotates counterclockwise together with the release lever 33. Further, when the reclining handle 25 at the unlocking operation position is rotated in the locking direction (counterclockwise direction in the figure), the first regulating lever 50 is also rotated counterclockwise. Then, when the rotation restricting arm 51c comes into contact with the folding engagement portion 50c as both of them turn, the second restricting lever 51 pushes against the first restricting lever 50 as shown by the phantom line in FIG. It is rotated clockwise relative to the release lever 33 while being moved. With the relative displacement between the second restriction lever 51 and the release lever 33, the engagement between the rotation restriction arm 51c and the folding engagement portion 50c is avoided. Then, as the release lever 33 rotates in the counterclockwise direction, the posture position of the second restriction lever 51 gradually changes, and when the rotation restriction arm 51c gets over the shape of the folding engagement portion 50c, the second The restriction lever 51 is again returned to the position state shown in FIG. 6 (position state where the second restriction lever 51 and the fixing pin 33Y abut) by the urging force of the spiral spring.

As is clear from the above description, the seat 11 of this embodiment includes an operation restricting means for restricting the unlocking operation in the reclining handle 25 when the memory operating operation of the seat back 13 is performed by the memory operating handle 37. Yes. As a result, the ratchet 30 can be prevented from freely rotating simultaneously with respect to both the slide pole 22 constituting the reclining lock mechanism and the pole 32 constituting the reclining memory mechanism, and the angle of the seat back 13 can be prevented from shifting. . The operation restricting means includes a first restricting lever 50 that rotates coaxially with the reclining handle 25 and a second restricting lever 51 that rotates coaxially with the release lever 33 in the counterclockwise direction. Since it consists of only one rotating member, the number of parts is small and the structure is simple and small, and the manufacturing cost can be kept low.
Furthermore, the simple and inexpensive structure can easily return the positional relationship when the relative positional relationship between the first regulating lever 50 and the second regulating lever 51 is reversed to the normal positional relationship before the reverse. It can be set as the structure which can be performed. Thereby, the malfunction which arises in the process of operation of the reclining handle 25 and the memory operation handle 37 can be eliminated.

As mentioned above, although this invention was demonstrated based on illustration embodiment, this invention is not limited to this embodiment.
For example, in the illustrated embodiment, the first restriction lever 50 is an independent member. However, on the premise that the first restriction lever 50 does not interfere with the constituent members of the reclining lock mechanism, a rotation restriction member corresponding to the first restriction lever 50 is attached to the reclining handle 25. It can also be formed integrally with the corresponding unlocking operation handle.
In addition, although the configuration in which the fixing pin 33Y that abuts on the second restriction lever 51 is assembled to be inserted into the connecting portion 51 is shown, a rotation restriction member corresponding to the second restriction lever and a memory corresponding to the release lever are shown. The structure for contacting the control lever is not particularly limited. For example, a protrusion may be formed on one of the rotation restricting member and the memory control lever, and the protrusion may be in contact with a part of the other.

It is a side view of the sheet apparatus concerning the embodiment of the present invention. It is a perspective view which shows a part of internal structure of the sheet | seat apparatus of FIG. FIG. 6 is a side view showing the reclining memory mechanism and the vicinity of the reclining handle when neither the reclining handle nor the memory operation handle is operated. FIG. 4 is a side view showing a state where the seat back is tilted forward by rotating the reclining handle in the unlocking direction from the state of FIG. 3. It is a side view which shows the state which inclined the seat back backward. FIG. 4 is a side view showing a state where the memory operation handle is operated from the state of FIG. 3 and the seat back is tilted forward. It is sectional drawing which follows the AA line of FIG. It is a side view which shows the state which the relative positional relationship of a 1st control lever and a 2nd control lever reversed. FIG. 9 is a side view showing a state where the memory operation handle is operated to release the memory from the state of FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Seat 12 Seat cushion 13 Seat back 13X Seat back rotation center axis 13A Standing position 13B Maximum backward tilt position 13C Forward tilt position 14 Floor 15 Seat cushion frame 16 Seat back frame 19 Hinge pin 19a Hinge cam 20 Lock plate 21 Lower arm 22 Slide pole 23 Slide cam 24 Spiral spring (lock bias spring)
25 Reclining handle (unlock operation handle)
26 Return spring 30 Ratchet 30a Memory recess 32 Pole 32a Memory protrusion 32b Interlocking pin 32c Cam surface 33 Release lever (memory control lever)
33a Pin insertion hole 33b Sub arm 33c Spring hook arm 33d Wire connection arm 33X Rotating shaft 33Y Fixed pin 34 Tension spring 35 Memory operation wire 37 Memory operation handle (memory operation member)
37a Wire connection portion 37X Rotating shaft 38 Bracket 39 Tension spring 40 Operation wire 50 First restriction lever (first rotation restriction member)
50a Fixing hole 50b Rotation restriction arm 50c Folding engagement part 51 Second restriction lever (second rotation restriction member)
51a Rotating shaft hole 51b Fixed arm 51c Rotation restricting arm 51d Connecting portion RE Rotating locus T Arrow M Arrow

Claims (2)

A seat back tiltable with respect to the seat cushion;
A reclining lock mechanism capable of switching between a locked state for restricting the tilt of the seat back and an unlocked state for releasing the restriction;
Independent of the reclining lock mechanism, a reclining memory mechanism capable of memorizing an angle before tilting and enabling a memory back operation to allow the seat back to tilt and a memory releasing operation to cancel the memory operating state;
An unlock operation handle for bringing the reclining lock mechanism into an unlocked state by a turning operation;
A memory control lever that is pivotally supported by a pivot shaft parallel to the pivot shaft of the unlock operation handle, and is pivoted to a memory operating position and a memory release position of the reclining memory mechanism according to an operation of a memory operation member; ,
A first rotation restricting member that rotates coaxially with the unlock operation handle;
It is pivotally supported by a pivot shaft that is coaxial or parallel to the pivot shaft of the memory control lever, and is relatively rotatable in one direction relative to the memory control lever. The reciprocating rotation is integrally rotated, and is normally urged and held in the integrally rotated state by the urging means, and is used as the memory operating position of the reclining memory mechanism by the memory operation member. A second rotation restricting member that is in a relative separating rotation direction in the other direction during the operation for
Have
When the memory control lever is in the memory operating position, the second rotation restricting member advances to the engagement position with the first rotation restricting member to restrict the unlocking operation of the unlocking operation handle, A configuration in which when the memory control lever is in the memory release position, the second rotation restricting member is retracted from the engagement position with the first rotation restricting member to allow the unlock operation handle to be unlocked; Has been
When the relative positional relationship between the first rotation restricting member and the second rotation restricting member is reversed due to the operation state of the memory operation member and the unlock operation handle, the memory control lever is By operating the memory operation member to rotate from the operating position toward the memory release position, the rotation of the second rotation restricting member relative to the memory control lever is a relative separation rotation in the one direction. The relative rotation between the first rotation restricting member and the second rotation restricting member is avoided by avoiding the reversely engaged state with the first rotation restricting member. A seat reclining device that is returned to a normal positional relationship. The seat reclining device according to claim 1,
It has a ratchet that is connected to each of the seat cushion and the seat back so as to be rotatable relative to the center of the seat back.
The reclining lock mechanism restricts the relative rotation of the ratchet with respect to the seat cushion, and releases the restriction by the unlocking operation of the unlocking operation handle.
The reclining memory mechanism is provided with a pole that is pivotally supported on the seat back side, restricts and allows relative rotation of the ratchet with respect to the seat back by being engaged with the ratchet,
The seat reclining device, wherein the memory control lever engages the pawl and the ratchet at the memory release position and releases the engagement at the memory operating position.

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