JP2019189127A - Lifter device - Google Patents

Abstract

To provide a lifter device which is capable of adjusting the height of a seat by operation of an operation handle, comprises a stopper limiting height adjustment operation at the upper or lower limit position and is durable against large force without increasing the size of the stopper.SOLUTION: A stopper 60 of a lifter device comprises: a rotary shaft side protrusion 63 protruded from the outer peripheral surface 22a of a pivot 22 in a radial direction; an engagement piece 62 supported slidably onto the outer peripheral surface 22a of the pivot 22 and engaging with the protrusion 63 in the circumferential direction of the pivot 22; a slide face part 31a provided on a circle concentric with the outer peripheral surface 22a, facing the surface 22a via a clearance capable of slidably holding the engagement piece 62; and a support member side protrusion 61 which is provided at a position separating from the pivot 22 in the radial direction on the support member 23 corresponding to the inner peripheral side of the slide face part 31a, does not engage with the protrusion 63 in the circumferential direction of the pivot 22 and engages with the engagement piece 62.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a lifter device used for a seat of an automobile or the like.

  2. Description of the Related Art A lifter device used for a seat of an automobile or the like adjusts the height of a seat cushion with respect to a floor by operating an operation handle, and various types have been developed. In the invention of Patent Document 1, when the operation handle is operated to the seat ascending or descending side, the height is adjusted by a certain amount for each operation, and the operation of the operation handle is repeated until the height desired by the seated person is reached. It is configured.

  Specifically, the rotation control device is configured to rotate the pinion gear coupled to the link mechanism so as to raise or lower the seat by the operation of raising or lowering the seat of the operation handle. In the rotation control device, the rotation shaft of the pinion gear is provided with a rotation drive mechanism that rotates the pinion gear and a lock mechanism that locks the rotation of the pinion gear.

  When the operation handle is pulled up, the pinion gear is rotationally driven so as to raise the seat by the rotational drive mechanism. At that time, the lock mechanism is locked by operating the lock mechanism at a position where the pinion gear is rotated by operation of the operation handle.

  When the operation handle is pushed down, the rotation drive mechanism does not function, the lock mechanism releases the lock, and the pinion gear is rotated in the direction of lowering the seat. At this time, in order to suppress the descending speed of the seat, the speed is suppressed by a damper coupled to the rotation shaft of the pinion gear.

  When the operation handle is not operated, the rotation of the pinion gear is locked by the lock mechanism, and the height of the seat is maintained.

  Even when the seat reaches the upper limit or lower limit position and the operation handle is not operated, it is necessary to make the rotation drive mechanism and the lock mechanism function normally. For this reason, the rotation control device is provided with a stopper that limits the rotation of the pinion gear when the seat is at the upper limit or lower limit position.

  FIG. 30 shows the configuration of the stopper of Patent Document 1. The stopper is rotatably provided on the outer periphery of the pin 101 protruding from the side wall of the claw wheel constituting the lock mechanism, the protrusion 103 protruding from the support member 102 of the rotation control device, and the rotation shaft 104 of the pinion gear. It consists of a ring 105 engaged with a pin 101 and a protrusion 103. When the seat reaches a position that restricts the rotation of the pinion gear at the upper limit or lower limit position, the pin 101 engages with the ring 105 that is engaged with the protrusion 103 and restricted in rotation, and the rotation of the pinion gear and the pinion gear is restricted. .

JP 2006-132423 A

  Assuming that a large external force is applied so as to raise or lower the seat in a state where the stopper is functioning, the stopper needs to have a strength capable of withstanding the large force. However, when the strength is increased, there is a problem that the stopper is enlarged. In the configuration of FIG. 30, it is particularly necessary to increase the strength of the pin 101. When the pin 101 is enlarged, the ring 105 is also enlarged, and the entire stopper is enlarged.

  An object of the present invention is to increase the size of a stopper in a lifter device including a stopper that can adjust the height of a seat by operating an operation handle and restricts the height adjustment operation at the upper or lower position of the height. It is to be able to withstand a great force.

  A lifter device according to a first aspect of the present invention includes a pinion gear that meshes with an input gear of a link mechanism that moves the seat up and down, and a rotation control device that controls the rotation of the pinion gear. The rotation control device includes: a rotation shaft that rotates in synchronization with the pinion gear; a support member that rotatably supports the rotation shaft; and an operation handle that moves the seat up and down. A rotation drive mechanism that rotates the rotation shaft in the upward direction when operated to raise the seat, and rotates the rotation shaft in the downward direction when the operation handle is operated to lower the seat; A locking mechanism that is provided on the rotating shaft and locks the rotation of the rotating shaft at an operation end position of the operating handle when the operating handle is operated to raise or lower the seat; And a stopper for limiting the rotation of the rotary shaft at an upper limit or a lower limit position. The stopper is supported on a rotary shaft-side protrusion projecting radially from the outer peripheral surface of the rotary shaft, and slidably supported on the outer peripheral surface of the rotary shaft, and in the circumferential direction of the rotary shaft, Provided on a concentric circle with the outer peripheral surface of the rotating shaft, facing the outer peripheral surface of the rotating shaft, and facing the outer peripheral surface of the rotating shaft with a gap capable of slidably holding the engaging piece. The sliding surface portion provided on the support member corresponding to the inner peripheral side of the sliding surface portion is provided at a position radially away from the rotation shaft, and the rotation shaft side collision in the circumferential direction of the rotation shaft. And a support member side protrusion that engages with the engagement piece without engaging with the portion. At the upper limit position and the lower limit position of the height of the seat, the rotation shaft side protrusions are opposed to each other in the circumferential direction of the rotation shaft with respect to the support member side protrusion with the engagement piece interposed therebetween. Engage to limit the rotation of the rotating shaft.

  According to the first invention, the rotation shaft side protrusion is formed by projecting the outer peripheral surface of the rotation shaft in the radial direction, and the engagement with the support member side protrusion via the engagement piece is performed on the rotation shaft side protrusion. Perform at both ends in the direction of rotation. In addition, the rotation shaft side protrusion and the support member side protrusion do not engage with each other in the rotation direction, and engage with each other with an engagement piece sandwiched between ends facing each other in the rotation direction. In addition, the angle between the upper limit position and the lower limit position at which the rotating shaft side protrusion and the support member side protrusion are engaged with each other with the engagement piece interposed therebetween can be greater than 360 degrees. Therefore, the magnitude | size of the rotation direction of a rotating shaft side protrusion can be ensured, and the intensity | strength of a rotating shaft side protrusion can be ensured easily. As a result, the strength as a stopper can be ensured without increasing the size of the rotating shaft side protrusion in the radial direction.

  According to a second aspect of the present invention, in the first aspect, the support member is formed to have a circular container shape, and an internal tooth that forms a part of the lock mechanism on an inner peripheral surface of an annular outer peripheral wall The rotating shaft is rotatably inserted into the circular center of the support member, and the lock mechanism is synchronized with the rotary shaft in a state of being inserted into the circular container shape of the support member. A lock plate holding a pole for locking the rotation of the rotary shaft by engaging with the inner teeth on the outer peripheral side, and the sliding surface portion is attached to the lock plate Is formed.

  According to the second invention, the sliding surface portion is formed using the lock plate. Therefore, it is possible to reduce the size of the device by forming the sliding surface portion without increasing the number of components.

It is a side view of the sheet | seat to which the lifter apparatus which is one Embodiment of this invention is applied. It is a side view from the sheet | seat inner side of the said embodiment. It is a disassembled perspective view of the principal part of the said embodiment. It is the perspective view which looked at the rotation control device of the above-mentioned embodiment from the sheet outside. It is the perspective view which looked at the rotation control device of the above-mentioned embodiment from the sheet inner side. It is a front view of the rotation control apparatus of the said embodiment. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG. 7 is a cross-sectional view taken along line VIII-VIII in FIG. 6. It is the disassembled perspective view which looked at the rotation control apparatus from the seat outer side. It is a disassembled perspective view which shows the assembly | attachment state between the one part components shown in FIG. It is a disassembled perspective view which shows the further assembly | attachment state between the one part components shown in FIG. It is a disassembled perspective view which shows the further assembly | attachment state between the one part components shown in FIG. It is the disassembled perspective view which looked at the rotation control apparatus from the sheet | seat inner side. It is a disassembled perspective view which shows the assembly | attachment state between some component parts shown in FIG. It is a disassembled perspective view which shows the further assembly | attachment state between the one part components shown in FIG. It is a state diagram of the feed function of the rotation control device when the operation handle is in the neutral position. It is a state diagram of the lock function. It is a state figure of a feed function when an operation handle is pushed down from a neutral position to a middle position. It is a state diagram of the lock function. It is a state figure of a feed function when an operation handle is pushed down from a neutral position to a full stroke position. It is a state diagram of the lock function. FIG. 6 is a state diagram of a feed function when the pinion gear is rotated forward by a gravitational action that is received from the seat side from a state in which the operation handle is pushed down. It is a state diagram of the lock function. It is a state diagram of the feed function when the operation handle is returned from the push-down operation state to the neutral position. It is a state diagram of the lock function. It is a state figure of a feed function when an operation handle is pulled up from a neutral position to a middle position. It is a state diagram of the lock function. FIG. 6 is a state diagram in which the rotation of the pinion gear in the push-down operation direction is stopped by a stopper. FIG. 6 is a state diagram in which the rotation of the pinion gear in the pulling operation direction is stopped by a stopper. It is sectional drawing which shows the stopper of the rotation control apparatus in the prior art example of this invention.

<Overall configuration of one embodiment>
1 to 3 show an automobile seat (hereinafter simply referred to as a seat) 1 to which a lifter device according to an embodiment of the present invention is applied. In each figure, the direction of each part in the state which mounted the sheet | seat in the motor vehicle by the arrow is shown. In the following description, the description regarding the direction is made based on this direction.

  As shown in FIG. 1, the seat 1 is provided with a seat back 3 that forms a backrest at the rear portion of the seat cushion 2 that forms a seat, and the seat back 3 is rotatable in the front-rear direction with respect to the seat cushion 2. Yes. The seat cushion 2 includes a lifter device 10 and a seat slide device 8 at a lower portion, and is fixed to a vehicle floor 4 via a bracket 7.

  As shown in FIG. 2, the seat slide device 8 is a known device, and a pair of left and right upper rails 6 are coupled to a pair of left and right lower rails 5 extending in the front-rear direction so as to be slidable in the front-rear direction. The left and right lower rails 5 are fixedly supported by a pair of front and rear brackets 7 fixed to the floor 4. A lifter device 10 is provided on the left and right upper rails 6.

  As shown in FIGS. 2 and 3, the lifter device 10 includes a base member 14 fixed on each upper rail 6, and a plurality of link members 11 rotatably coupled to the front and rear end portions of each upper rail 6. A side frame 13 that is a skeleton member of the cushion 2, a base member 14, and each link member 11 constitute a link mechanism 12 that is a four-bar link. Of the plurality of link members 11, the rear link 11 b on the right rear side includes a sector gear (corresponding to the input gear of the present invention) 16 and is rotated in the front-rear direction by the pinion gear 18 of the rotation control device 21. It is configured as follows. The rotation axis of the right rear rear link 11b with respect to the side frame 13 is constituted by a torque rod 17, and the left rear rear link (not shown) is also synchronized with the rear link 11b via the torque rod 17. It is configured to rotate.

  The side frame 13 is provided with a through hole 13a for inserting the pinion gear 18, and the rotation control device 21 is fixed to the right side wall of the side frame 13 so that the pinion gear 18 is inserted into the through hole 13a. ing. The rotation control device 21 can be rotated in the forward and reverse directions by an operation handle 20 that extends in the front-rear direction on the right side portion of the seat cushion 2. When the operation handle 20 is rotated upward, the rotation control device 21 rotates the rear link 11b so as to rise from the base member 14, and when the operation handle 20 is rotated downward, the rotation control device 21 moves the rear link 11b. The base member 14 rotates so as to be bent down. With the configuration of the four-joint link described above, the front link 11a also rotates according to the rotation of the rear link 11b, and the height of the seat cushion 2 from the floor 4 is adjusted according to the operation of the operation handle 20.

<Configuration of rotation control device 21 (lock mechanism 30)>
4 to 6 show the rotation control device 21 removed from the seat cushion 2. Hereinafter, the configuration of the rotation control device 21 will be described with reference to FIGS.

  The rotation control device 21 is assembled such that the rotation shaft 22 passes through the center hole 23c of the support member 23 that is a base member, and the pinion gear 18 protrudes from the left side surface of the support member 23. The support member 23 is fixed to the side frame 13 with the pinion gear 18 passing through the through hole 13a (see FIGS. 2 and 3) of the side frame 13.

  The right side surface of the support member 23 is stamped and formed on the left side so as to accommodate the lock plate 31 of the lock mechanism 30 to form a guide recess 23b, and has a circular container shape as a whole. Inner teeth 34 that mesh with poles 32 and 33 described later are formed on the inner peripheral surface of the guide recess 23b. A spline hole 31 b is formed at the center of the lock plate 31 so as to mesh with the spline 22 b of the rotary shaft 22. Therefore, the lock plate 31 is rotated synchronously with the rotary shaft 22.

  On the outer peripheral portion of the right side surface of the lock plate 31, one protrusion 31 d is protruded and distributed in the vertical direction, and two protrusions 31 e are protruded and distributed in the front and rear. The protrusions 31e are fitted in the through holes 32a and 33a of the poles 32 and 33 so that the poles 32 and 33 can swing around the protrusions 31e. Further, each projection 31d is fitted with a winding portion 35a of a torsion spring 35, and each end portion 35b of the torsion spring 35 is engaged with each of the poles 32 and 33, and locks each of the poles 32 and 33. The plate 31 is biased toward the outer peripheral side. Therefore, the engaging end portions 32 c and 33 c of the respective poles 32 and 33 are always engaged with the internal teeth 34 of the support member 23.

  FIG. 11 shows a state in which the lock mechanism 30 is assembled to the support member 23 as described above.

<Configuration of Rotation Control Device 21 (Rotation Drive Mechanism 50)>
A plate-like input member 41 that is coupled to the operation handle 20 and is rotated is provided on the right side surface of the cover 24 formed in a container shape that swells to the right as a whole. A caulking end portion 25b of the caulking pin 25 is inserted into the center hole 41b of the input member 41 through the through hole 24e of the cover 24 and fixed thereto. The caulking pin 25 allows the cover 24 and the input member 41 to be slidable with respect to each other. Are combined. An engagement piece 42 is formed at the upper part of the input member 41 by bending it to the left side, and the engagement piece 42 is aligned with the inner peripheral side of the engagement piece 24 b formed to protrude to the right side of the cover 24. Has been placed. An end 43a of the torsion spring 43 is disposed so as to wrap around the engaging pieces 42 and 24b. Therefore, when the input member 41 is rotated by the operation handle 20, the engagement piece 42 moves away from the engagement piece 24b in the circumferential direction, but when the rotation operation is released, the torsion spring 43 Due to the urging force, the engagement piece 42 and the engagement piece 24b are positioned to overlap each other in the circumferential direction, and the input member 41 is returned to the position before the rotation operation.

  A connecting member 53 and a cam member 54 are provided on the left side of the cover 24 so as to be accommodated in the container-like cover 24. The cover 24 is fixed to the support member 23 by sandwiching these components together with the lock plate 31 and the rotation transmission plate 36. At this time, the leg portion 24d of the cover 24 is fixed to the through hole 23a of the support member 23 with a rivet (not shown).

  The cam member 54 is generally formed in a ring shape, is provided with four pins 54b on the right side surface, and is formed with a cam projection 54a protruding above the inner periphery of the ring shape. Each pin 54 b of the cam member 54 is fixed to the inside of the cover 24 by fitting into the through hole of the protruding piece 24 c of the cover 24.

  The connecting member 53 includes arms 53 a extending to the right at the front and rear portions, and each arm 53 a passes through the opening 24 a of the cover 24 and penetrates the through hole 41 a of the input member 41. Therefore, the connecting member 53 can be rotated together with the input member 41. On the left side surface of the connecting member 53, a pair of feed claws 52 are swingably coupled by fitting the hinge portions 52 b of the feed claws 52 into the through holes 53 b of the connection member 53.

<Configuration of rotation control device 21 (rotation transmission plate 36)>
A rotation transmission plate 36 is provided on the left side of the connection member 53, and the rotation transmission plate 36 is sandwiched between the connection member 53 and the lock plate 31. On the surface of the rotation transmission plate 36, four substantially square engaging holes 36a are formed corresponding to the poles 32 and 33, respectively. The pins 32b and 33b of the poles 32 and 33 are inserted into the engagement holes 36a so as to be engageable. On the surface of the rotation transmission plate 36, two elliptical engagement holes 36b are formed corresponding to the protrusions 31d. Each protrusion 31d is inserted into each engagement hole 36b so as to be engageable.

  Furthermore, on the right side surface of the rotation transmission plate 36, torsion springs 37 and 55 are provided around the center hole 36d. The end portion 37 a of the torsion spring 37 is bent to the left and is inserted into the long hole 36 c of the rotation transmission plate 36 and the long hole 31 c of the lock plate 31 so as to be engageable. The torsion spring 37 maintains the rotation angle of the rotation transmission plate 36 with respect to the lock plate 31 in the neutral position by the biasing force. On the other hand, the end 55a of the torsion spring 55 urges the protrusion 52d of the feed claw 52 to press each feed claw 52 to the outer peripheral side. In addition, a projection 55 b that protrudes toward the right side is formed at the center of the torsion spring 55. The protrusion 55 b is engaged by being inserted into an engagement hole 53 c formed at the lower center portion of the connecting member 53. Therefore, the protrusion 52 d of the feed claw 52 is constantly pressed by the end 55 a of the torsion spring 55, and the engagement end 52 a is engaged with the internal teeth 51 of the rotation transmission plate 36.

  As described above, the state in which the input member 41 and the rotation drive mechanism 50 (the connecting member 53, the cam member 54, the feed claw 52, the internal teeth 51 of the rotation transmission plate 36, the torsion spring 55) are assembled to the cover 24 is illustrated in FIG. , 15. FIG. 12 shows a state where the rotation transmission plate 36 is assembled on the lock plate 31. 11 and 12 do not show the procedure for assembling the rotation control device 21, but the spline 22c of the rotary shaft 22 is finally fitted into the spline hole 25a of the caulking pin 25, and the cover 24 is further supported by the support member 23. As a result, the rotation control device 21 is assembled.

<Configuration of rotation control device 21 (stopper 60)>
An outer peripheral surface 22a is formed between the pinion gear 18 of the rotary shaft 22 and the spline 22b, and a rotary shaft-side protrusion 63 is formed to project in the radial direction at a specific angular position of the outer peripheral surface 22a. . In a state where the rotation shaft 22 is inserted into the center hole 23 c of the support member 23, the rotation shaft side protrusion 63 is positioned so as to be exposed on the right side surface of the guide recess 23 b of the support member 23.

  On the right side surface of the guide recess 23 b of the support member 23, an arcuate support member side protrusion 61 is formed by stamping. On the other hand, around the spline hole 31b of the lock plate 31, the lock plate 31 is formed so as to form a sliding surface portion 31a concentric with the spline hole 31b. When the lock plate 31 is rotated with respect to the support member 23, the outer periphery of the support member side protrusion 61 slides on the inner periphery of the sliding surface portion 31a. Further, the engaging piece 62 is arranged so as to slide in the gap between the inner periphery of the sliding surface portion 31 a and the outer peripheral surface 22 a of the rotating shaft 22.

  Therefore, when the rotation shaft 22 is rotated in the downward direction by the operation of the rotation control device 21 and reaches the lower limit position, the rotation shaft side protrusion 63 sandwiches the engagement piece 62 and the support member side protrusion as shown in FIG. Abutting on the end of 61, the rotation of the rotary shaft 22 is stopped. When the rotary shaft 22 is rotated in the upward direction and reaches the upper limit position as shown in FIG. 29, the rotary shaft side protrusion 63 is located at the opposite end of the support member side protrusion 61 with the engagement piece 62 interposed therebetween. A further portion of the rotary shaft 22 is stopped.

<Operation of the rotation control device 21 (the operation handle 20 is not operated)>
Hereinafter, the height adjusting action of the seat cushion 2 by the rotation control device 21 will be described with reference to FIGS.

  16 and 17 show a neutral position state in which the operation handle 20 is not operated and the input member 41 and the connecting member 53 are not rotated. At this time, as shown in FIG. 16, the feed claw 52 is in a state where the engagement end portion 52 a is engaged with the internal teeth 51 of the rotation transmission plate 36 by the urging of the torsion spring 55. In addition, as shown in FIG. 17, the pawls 32 and 33 of the lock mechanism 30 are brought into a state in which the engaging end portions 32 c and 33 c are engaged with the internal teeth 34 of the support member 23 by the urging of the torsion springs 35. ing. Therefore, the lock mechanism 30 is locked, the lock plate 31 is not rotated, and the height of the seat 1 is not changed to the ascending side or the descending side.

<Operation of the rotation control device 21 (the operation handle 20 is pushed down)>
18 and 19 show a state in which the operation handle 20 is pushed down from the neutral position to the middle position. At this time, as shown in FIG. 18, the connection member 53 is rotated in the arrow direction by the rotation of the input member 41. As a result, each feed claw 52 is moved in the same direction. Therefore, the engagement end portion 52a of the front feeding claw 52 transmits a force to the internal teeth 51 of the rotation transmission plate 36, and rotates the rotation transmission plate 36 in the direction of the arrow. At this time, the engagement end portion 52 a of the rear feed claw 52 is not engaged with the internal teeth 51 of the rotation transmission plate 36. In other words, in this state, the teeth of the engagement end 52a are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 51. In addition, as the rotation transmission plate 36 rotates, the pin 52 c of the rear feed claw 52 rides on the cam protrusion 54 a of the cam member 54, and the engagement end 52 a is separated from the internal teeth 51.

  When the rotation transmission plate 36 is rotated in this way, the engagement hole 36a of the rotation transmission plate 36 engages with the pin 33b of each pole 33 and the engagement end portion 33c of each pole 33 as shown in FIG. Is in a state separated from the internal teeth 34 of the support member 23. That is, the lock state of the lock plate 31 in the descending direction is released. Thereafter, when the protrusion 31d of the lock plate 31 is engaged with the engagement hole 36b, the rotation of the rotation transmission plate 36 can be transmitted to the lock plate 31.

<Operation of the rotation control device 21 (full stroke operation of the operation handle 20)>
20 and 21 show a state where the operation handle 20 is pushed down from the neutral position to the full stroke position. The full stroke position is determined by the arm 53a of the connecting member 53 coming into contact with the circumferential end of the opening 24a of the cover 24 (see FIGS. 8, 10, and 11). At this time, as shown in FIG. 20, the rotation of the connecting member 53 and each feed claw 52 proceeds as compared with the state of FIG. 18, and the rotation angle of the rotation transmission plate 36 is increased by the front feed claw 52.

  When the rotation angle of the rotation transmission plate 36 is increased in this manner, the rotation of the rotation transmission plate 36 is transmitted to the lock plate 31 and the lock plate 31 is rotated, as shown in FIG. The rotating shaft 22 is rotated. As a result, the pinion gear 18 is rotated and the seat cushion 2 is lowered. At this time, the engagement end portion 32 c of each pole 32 is configured not to mesh with the internal teeth 34 of the support member 23. That is, in this state, the teeth of the engagement end portion 32c are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 34. Therefore, when the lock plate 31 rotates, the engagement end portion 32 c of each pole 32 is slid on the inner teeth 34 of the support member 23. The movement of each pole 32 at this time is indicated by a solid line and a virtual line. It is also indicated by a wavy arrow.

<Operation of the rotation control device 21 (effect of gravity of the seat 1)>
22 and 23 show a state in which the rotation of the pinion gear 18 in the seat lowering direction due to the gravity applied to the seat cushion 2 exceeds the rotation of the pinion gear 18 in the seat lowering direction as described above due to the pressing operation of the operation handle 20. Indicates. That is, it shows a state in which the operation force of pushing down the operation handle 20 is weakened. At this time, since the rotation transmission plate 36 continues to rotate by the feed claws 52, the state of each feed claw 52 is the same as the state of FIG. 20 as shown in FIG. On the other hand, the lock plate 31 is not rotated by the rotation transmission plate 36 but is rotated by the rotation shaft 22. Therefore, as shown in FIG. 23, the swing state of each pole 33 by the engagement hole 36a is released, and each pole 33 is in a locked state in which the lock plate 31 is rotated in the downward direction. Therefore, it is possible to prevent the seat cushion 2 from being lowered due to gravity applied to the operation handle 20 during the push-down operation. In this state, in order to prevent the seat cushion 2 from descending due to gravity due to a delay in the operation of each pole 33 locking the rotation of the lock plate 31 in the descending direction, a certain amount of braking is applied to the rotation of the rotating shaft 22. It is desirable to suppress the rotation shaft 22 from being rotated by the gravity of the sheet 1 by using the above.

<Operation of the rotation control device 21 (when the operation handle 20 is depressed)>
24 and 25 show a state where the operation handle 20 has been depressed and returned to the neutral position. At this time, the input member 41 is returned to the neutral position by the urging force of the torsion spring 43, and the connecting member 53 is also returned to the neutral position in synchronization. Therefore, the connecting member 53 is rotated as indicated by an arrow in FIG. Until the connecting member 53 is returned to the neutral position, the rear feed claw 52 is in a state in which the pin 52c rides on the cam projection 54a of the cam member 54. When the connecting member 53 returns to the neutral position, as shown in FIG. 24, the rear feed claw 52 returns to the state where the engagement end portion 52 a is engaged with the internal teeth 51 of the rotation transmission plate 36. On the other hand, in the front feed claw 52, the engaging end 52a slides on the inner teeth 51 of the rotation transmission plate 36 until the connecting member 53 is returned to the neutral position.

  When the push-down operation of the operation handle 20 is stopped, as described above, the rotational drive by the feed claw 52 to the rotation transmission plate 36 is released, so that the rotation transmission plate 36 is applied to the lock plate 31 by the urging force of the torsion spring 37. On the other hand, it is returned to the initial position. Therefore, as shown in FIG. 25, each of the poles 32 and 33 is in a state where the engagement end portions 32c and 33c are engaged with the internal teeth 34 of the support member 23, and the lock plate 31 is locked at that position. Become. Accordingly, the pinion gear 18 also stops rotating, and the height of the seat cushion 2 is maintained at the position operated so far.

<Operation of the rotation control device 21 (pull-up operation of the operation handle 20)>
26 and 27 show a state where the operation handle 20 is pulled up from the neutral position to the middle position. At this time, as shown in FIG. 26, the connecting member 53 is rotated in the direction of the arrow by the rotation of the input member 41. As a result, each feed claw 52 is moved in the same direction. Therefore, the engagement end portion 52a of the rear feed claw 52 transmits a force to the internal teeth 51 of the rotation transmission plate 36, and rotates the rotation transmission plate 36 in the same direction. At this time, the engaging end 52a of the front feed claw 52 is not engaged with the internal teeth 51 of the rotation transmission plate 36. In other words, in this state, the teeth of the engagement end 52a are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 51. In addition, as the rotation transmission plate 36 rotates, the pin 52 c of the front feeding claw 52 rides on the cam protrusion 54 a of the cam member 54, and the engagement end 52 a is separated from the internal teeth 51.

  When the rotation transmission plate 36 is rotated in this way, the engagement hole 36a of the rotation transmission plate 36 engages with the pin 32b of each pole 32 and the engagement end portion 32c of each pole 32 as shown in FIG. Is in a state separated from the internal teeth 34 of the support member 23. That is, the lock state of the lock plate 31 in the upward direction is released. Thereafter, when the protrusion 31 d of the lock plate 31 is engaged with the engagement hole 36 b, the rotation of the rotation transmission plate 36 is transmitted to the lock plate 31. Therefore, as shown by the arrow in FIG. 27, the lock plate 31 rotates to rotate the rotating shaft 22. As a result, the pinion gear 18 is rotated and the seat 1 is raised. At this time, the engagement end portion 33 c of each pole 33 is not engaged with the internal teeth 34 of the support member 23. That is, in this state, the teeth of the engagement end portion 33c are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 34. Therefore, when the lock plate 31 rotates, the engagement end portion 33 c of each pole 33 is slid on the inner teeth 34 of the support member 23.

<Operation of rotation control device 21 (summary)>
As described above, when the operation handle 20 is pushed down, the seat 1 is lowered by an amount corresponding to the operation. The sheet 1 can be adjusted to a desired height by repeating the pressing operation. On the contrary, when the operation handle 20 is pulled up, similarly, the seat 1 is raised by an amount corresponding to the operation. The sheet 1 can be adjusted to a desired height by repeating the pulling operation.

  When the sheet 1 reaches the lower limit position or the upper limit position by the above operation, the rotation of the rotation shaft 22 is stopped as shown in FIG.

<Effects of the embodiment>
According to the above embodiment, the rotation shaft side protrusion 63 is formed by protruding the outer peripheral surface of the rotation shaft 22 in the radial direction, and the engagement with the support member side protrusion 61 via the engagement piece 62 is performed on the rotation shaft. This is performed at both ends of the side protrusion 63 in the rotation direction. Moreover, the rotation shaft side protrusion 63 and the support member side protrusion 61 do not engage with each other in the rotation direction, but engage with the engagement piece 62 sandwiched between the ends facing each other in the rotation direction. In addition, the angle between the upper limit position and the lower limit position at which the rotation shaft side protrusion 63 and the support member side protrusion 61 engage with each other with the engagement piece 62 interposed therebetween can be greater than 360 degrees. Therefore, the magnitude | size of the rotation direction of the rotating shaft side protrusion 63 can be ensured, and the intensity | strength of the rotating shaft side protrusion 63 can be ensured easily. As a result, the strength as a stopper can be ensured without increasing the size of the rotating shaft side protrusion 63 in the radial direction. Further, the sliding surface portion 31 a is formed using the lock plate 31. Therefore, it is possible to reduce the size of the apparatus by forming the sliding surface portion 31a without increasing the number of components.

<Other embodiments>
As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible. For example, in the above embodiment, the present invention is applied to an automobile seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like, or a seat installed in a movie theater or the like.

1 Car seat (seat)
2 Seat cushion 3 Seat back 4 Floor 5 Lower rail 6 Upper rail 7 Bracket 8 Seat slide device 10 Lifter device 11 Link member 11a Front link 11b Rear link 12 Link mechanism 13 Side frame 13a Through hole 14 Base member 16 Sector gear (input gear)
17 Torque rod 18 Pinion gear 20 Operation handle 21 Rotation control device 22 Rotating shaft 22a Outer peripheral surface 22b, 22c Spline 23 Support member 23a Through hole 23b Guide recess 23c Center hole 24 Cover 24a Opening 24b Engagement piece 24c Projection piece 24d Leg part 24e Through hole 25 Caulking pin 25a Spline hole 25b Caulking end 30 Lock mechanism 31 Lock plate 31a Sliding surface 31b Spline hole 31c Long hole 31d, 31e Protrusion 32, 33 Pole 32a, 33a Through hole 32b, 33b Pin 32c, 33c Engagement end Portion 34 internal teeth 35 torsion spring 35a wound portion 35b end portion 36 rotation transmission plate 36a engagement hole 36b engagement hole 36c long hole 36d center hole 37 torsion spring 37a end portion 41 input member 41a through hole 41b center hole 42 Joint 43 Torsion spring 43a End 50 Rotation drive mechanism 51 Internal tooth 52 Feed claw 52a Engagement end 52b Hinge 52c Pin 52d Projection 53 Connection member 53a Arm 53b Through-hole 53c Engagement hole 54 Cam member 54a Cam projection 54b Pin 55 Torsion spring 55a End 55b Protrusion 60 Stopper 61 Support member side protrusion 62 Engagement piece 63 Rotating shaft side protrusion

Claims (2)

A pinion gear meshing with an input gear of a link mechanism that moves the seat up and down;
A rotation control device for controlling the rotation of the pinion gear,
The rotation control device includes:
A rotating shaft that rotates in synchronization with the pinion gear;
A support member that rotatably supports the rotating shaft;
When an operating handle for raising and lowering the seat is operated to raise or lower the seat, the operating force of the operating handle is transmitted to the rotating shaft to rotate the rotating shaft in the up or down direction. A rotational drive mechanism for driving;
A lock mechanism that allows rotation of the rotating shaft when the operating handle is operated to raise or lower the seat, and locks rotation of the rotating shaft at an operation end position of the operating handle;
A lifter device comprising a stopper for restricting rotation of the rotary shaft at an upper limit or lower limit position for restricting the lifting operation of the seat,
The stopper is
A rotating shaft side protrusion protruding radially from the outer peripheral surface of the rotating shaft;
An engagement piece that is slidably supported on the outer peripheral surface of the rotary shaft and engages with the rotary shaft-side protrusion in the circumferential direction of the rotary shaft;
A sliding surface provided concentrically with the outer peripheral surface of the rotating shaft, facing the outer peripheral surface of the rotating shaft via a gap capable of slidably holding the engagement piece;
On the support member corresponding to the inner peripheral side of the sliding surface portion, provided at a position radially away from the rotary shaft, does not engage with the rotary shaft-side protrusion in the circumferential direction of the rotary shaft, A support member side protrusion that engages with the engagement piece,
At the upper limit position and the lower limit position of the seat height, the rotation shaft side protrusions are opposed to each other in the circumferential direction of the rotation shaft with respect to the support member side protrusion with the engagement piece interposed therebetween. A lifter device that engages and restricts rotation of the rotating shaft. In claim 1,
The support member is formed to have a circular container shape, and includes an inner tooth that forms a part of the lock mechanism on an inner peripheral surface of an annular outer peripheral wall,
The rotating shaft is rotatably inserted into the circular center of the support member,
The lock mechanism is coupled to rotate in synchronization with the rotation shaft in a state of being inserted into the circular container shape of the support member, and the lock mechanism is engaged with the inner teeth on the outer peripheral side. It has a lock plate that holds a pole that locks the rotation of the rotating shaft,
The sliding surface portion is a lifter device formed on the lock plate.

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