WO2018216783A1 - Lifter device - Google Patents

Abstract

According to the present invention, a stopper (70) is provided with: a rotation shaft-side protrusion (71) which is provided both on the outer circumferential surface of an outer circumferential surface part (22c) of a rotation shaft (22) and on an end surface of a ratchet (31), and protrudes from each of the surfaces; an engagement member (74) which is slidably supported on the outer circumferential surface of the outer circumferential surface part (22c), and engages with the rotation shaft-side protrusion (71) in the rotation direction of the rotation shaft (22); and a support member-side protrusion (73) which is provided to engage with the engagement member (74) in the rotation direction of the rotation shaft (22) by configuring such that a sliding surface part (23d) of a support member (23) is formed concentric with the outer circumferential surface of the outer circumferential surface part (22c) and a portion of the sliding surface part (23d) protrudes toward the outer circumferential surface part (22c), wherein the sliding surface part (23d) faces the outer circumferential surface part (22c) so that the engagement member (74) is slidably interposed between the support member (23) and the outer circumferential surface of the outer circumferential surface part (22c).

Description

Lifter device

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

Lifter devices used in automobile seats, etc., adjust the height of the seat cushion relative to the floor by operating the 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 handle is repeatedly operated 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 lifted, the pinion gear is driven to rotate so as to raise the seat by the rotation 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 properly. 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. 52 shows the structure 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. .

Japanese Unexamined Patent Publication No. 2016-132423

If it is assumed that a large external force is applied so as to raise or lower the seat while the stopper is functioning, the stopper needs to be strong enough to withstand the large force. However, when the strength is increased, there is a problem that the stopper is enlarged. In the configuration of FIG. 52, 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.

One of the objects of the present invention is to provide a lifter device having a stopper that can adjust the height of the seat by operating the 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 without becoming.

In the first aspect of the present invention, the lifter device comprises:
A pinion gear meshing with an input gear of a link mechanism that moves the seat up and down;
A lift control device that controls 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;
A rotation drive mechanism for rotating the rotation shaft so as to correspond to an operation of an operation handle for moving the seat up and down;
A lock mechanism for locking the rotation of the rotary shaft at the operation end position of the operation handle;
A stopper that limits the rotation of the rotary shaft at an upper limit position or a lower limit position that limits the lifting operation of the seat,
The stopper is
A rotating shaft side protrusion provided on the outer peripheral surface of the rotating shaft;
Provided slidably with respect to the outer peripheral surface of the rotary shaft, and engages with the rotary shaft-side protrusion in the circumferential direction of the rotary shaft when in a predetermined engagement position in the rotational direction of the rotary shaft. An engaging member;
A support member-side protrusion provided on the support member and engaged with the engagement member in the circumferential direction when the engagement member is in the engagement position;
And when the seat is in the upper limit position or the lower limit position, the engagement member is in the engagement position, and the rotation shaft side protrusion and the support member side protrusion are When the engagement member is sandwiched, the rotation of the rotation shaft is limited.

According to the first aspect, the rotation of the rotating shaft is restricted by the engagement member being sandwiched between the rotating shaft side protrusion and the support member side protrusion. Further, since the rotation shaft side protrusion, the support member side protrusion, and the engaging member are separate members, the rotation shaft side protrusion, the support member side protrusion, and the engagement member are compared with the above-described conventional technology. The degree of freedom of design of each joint member is high. Therefore, for example, at least one of the rotation shaft side protrusion, the support member side protrusion, and the engagement member has a shape superior in strength to the related art in the circumferential direction of the rotation shaft. If configured, the lifter device can be configured to withstand a large force without increasing the size of the stopper.

In the second aspect of the present invention, in the first aspect,
The rotation drive mechanism is provided on the rotation shaft, and when the operation handle is operated to raise the seat, the rotation shaft is rotationally driven in the upward direction, and the operation handle lowers the seat. When operated, the rotary shaft is not rotationally driven and is in a free rotating state,
The lock mechanism is provided on the rotation shaft, and when the operation handle is operated to raise the seat, the rotation of the rotation shaft is locked at an operation end position of the operation handle, and the operation handle is moved to the seat. When the operation is performed to lower the rotation axis, the rotation of the rotation shaft is not locked and is in a free rotation state,
The rotating shaft side protrusion extends across the outer peripheral surface of the small diameter outer peripheral surface portion and the end surface of the large diameter outer peripheral surface portion adjacent to each other in the step portion formed by changing the outer diameter on the outer peripheral surface of the rotating shaft. Provided, protruding from each surface,
The engaging member is slidably supported on the outer peripheral surface of the small-diameter side outer peripheral surface portion, and engages with the rotary shaft-side protrusion in the rotation direction of the rotary shaft,
The support member side protrusion is opposed to the small-diameter side outer peripheral surface portion, and the sliding surface portion of the support member that slidably holds the engaging member between the small-diameter side outer peripheral surface portion and the outer peripheral surface of the small-diameter side outer peripheral surface portion. It is formed concentrically with the outer peripheral surface of the small-diameter outer peripheral surface portion, and is provided so that a part of the sliding surface portion protrudes toward the small-diameter outer peripheral surface portion and engages with the engaging member in the rotational direction of the rotating shaft. It is supposed to be.

In the second side surface, the end surface of the large-diameter outer peripheral surface portion on which the rotating shaft side protrusion is provided may be an end surface of a member constituting a lock mechanism or an end surface of a member provided exclusively.

According to the second aspect described above, the rotating shaft side protrusion that forms the stopper is provided across the outer peripheral surface of the small-diameter outer peripheral surface portion and the end surface of the large-diameter outer peripheral surface portion. When the rotating shaft-side protrusion engages with the supporting member-side protruding portion with the engaging member interposed therebetween and functions as a stopper, the rotating shaft-side protruding portion engages with the supporting member-side protruding portion via the engaging member. Receiving reaction force. At this time, the rotating shaft side protrusion is supported by both the outer peripheral surface of the small diameter side outer peripheral surface portion and the end surface of the large diameter side outer peripheral surface portion. That is, the rotating shaft side protrusion has a shearing surface in two directions when functioning as a stopper. Therefore, the strength as a stopper can be increased without increasing the size of the rotating shaft side protrusion.

In the third aspect of the present invention, in the second aspect, the dimension of the engaging member in the radial direction of the rotating shaft is the amount of protrusion of the rotating shaft side protrusion from the small diameter side outer peripheral surface portion, and The engaging member, the small-diameter side outer peripheral surface portion, and the sliding member are calculated from the total amount of the protrusion amount of the supporting member-side protruding portion from the sliding surface portion and the clearance between the rotating shaft-side protruding portion and the supporting member-side protruding portion. The value excluding the gap with the surface portion.

According to the third aspect, the inner diameter of the sliding surface portion of the support member is a size that sandwiches the engaging member with the outer peripheral surface of the small-diameter side outer peripheral surface portion, and the radial dimension of the engaging member is the rotation The size is such that the shaft side protrusion and the support member side protrusion can be engaged as a stopper. Therefore, the inner diameter of the sliding surface portion can be set to the smallest dimension within the range where the above engagement is possible. As a result, when the sliding surface portion is formed on the support member, the influence on other functions on the support member can be minimized, and the design of the rotating shaft side protrusion, the support member side protrusion, and the like that constitute the stopper can be made. The degree of freedom can be increased.

In a fourth aspect of the present invention, in the second aspect, the engagement member is integrally provided with a ring formed on a concentric circle on the outer peripheral surface of the small-diameter outer peripheral surface portion, and the ring includes the ring. An outer peripheral surface is slidable with a guide surface portion facing the small-diameter outer peripheral surface portion of the support member-side protrusion, and an inner peripheral surface thereof is slidable with an outer peripheral surface of the rotating shaft-side protrusion.

In the fourth aspect, the guide surface portion may be divided into a plurality along the outer periphery of the ring, or may be provided as a continuous one.

According to the fourth aspect, the engagement member is integrated with the ring, the outer peripheral surface of the ring is slid on the guide surface portion of the support member side protrusion, and the inner peripheral surface of the ring is the outer periphery of the rotation shaft side protrusion. Sliding on the surface. Therefore, even if the engagement member is downsized, the posture can be always stabilized.

According to a fifth aspect of the present invention, in the fourth aspect, the support member-side protrusion includes an engagement surface portion that engages with the engagement member at both ends of the rotation shaft in the rotation direction. The circumferential angle of the sliding surface portion sandwiched between the engaging surface portions is smaller than 180 degrees, and the side adjacent to each engaging surface portion of the guide surface portion is separated from the guide surface portion and the sliding An inner diameter of the guide surface portion is enlarged so as to be movable toward the surface portion side.

When the circumferential angle of the sliding surface portion of the support member sandwiched between both engaging surface portions is smaller than 180 degrees, when the ring receives a force toward the sliding surface portion in a direction perpendicular to the rotation axis, May be caught between the guide surface portions narrowed in the direction perpendicular to the rotation axis. According to the fifth aspect, the inner diameter of the guide surface portion is increased on the sliding surface portion side of the guide surface portion, and the ring is movable in a direction orthogonal to the rotation axis. Therefore, it is possible to suppress a problem that the ring is bitten.

In a sixth aspect of the present invention, in the first aspect,
When the operation handle is operated so as to raise or lower the seat, the rotation drive mechanism transmits the operation force of the operation handle to the rotation shaft to drive the rotation shaft in the up or down direction. And
When the operation handle is operated to raise or lower the seat, the lock mechanism allows the rotation shaft to rotate, and locks the rotation shaft at the operation end position of the operation handle,
The rotating shaft side protrusion protrudes radially from the outer peripheral surface of the rotating shaft,
The engagement member is an engagement piece that is slidably supported on the outer peripheral surface of the rotation shaft and engages with the rotation shaft side protrusion in the circumferential direction,
The stopper has a sliding surface portion concentrically provided with the outer peripheral surface of the rotating shaft so as to face the outer peripheral surface of the rotating shaft via a gap capable of slidably holding the engaging piece. And
The support member side protrusion is provided on the support member corresponding to the inner peripheral side of the sliding surface portion at a position radially away from the rotation shaft, and the rotation shaft side protrusion in the circumferential direction. Does not engage, engages with the engagement piece,
When the sheet is in the upper limit position or the lower limit position, the rotation shaft side protrusions engage with each other in the circumferential direction with respect to the support member side protrusions with the engagement piece interposed therebetween. Thus, the rotation of the rotating shaft is limited.

According to the sixth aspect, the rotation shaft side protrusion is formed by protruding 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. At both ends in the direction of rotation of the part. 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 seventh aspect of the present invention, in the sixth aspect, the support member is formed to have a circular container shape, and 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 locking mechanism is inserted into the circular container shape of the support member, and the rotating shaft And 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 includes the lock It is formed on a plate.

According to the seventh aspect, 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 1st Embodiment of this invention is applied. It is a side view from the sheet | seat inner side of 1st Embodiment. It is a disassembled perspective view of the principal part of 1st Embodiment. It is a surface side perspective view of the rotation control device of a 1st embodiment. It is a back surface side perspective view of the rotation control device of a 1st embodiment. It is a front view of the rotation control device of the first embodiment. FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. FIG. 7 is a cross-sectional view taken along line BB in FIG. 6. It is a disassembled perspective view of the rotation control apparatus of 1st Embodiment. It is a disassembled perspective view of the rotation control apparatus of 1st Embodiment, and is a perspective view from a different angle from FIG. FIG. 9 is a cross-sectional view taken along the line CC of FIG. FIG. 9 is a sectional view taken along the line DD in FIG. 8. FIG. 9 is a sectional view taken along the line EE in FIG. 8. It is sectional drawing similar to FIG. 11, and shows the state by which the operation handle was operated only the 1st angle to the raising side. It is sectional drawing similar to FIG. 12, and shows the state by which the operation handle was operated only the 1st angle to the raising side. FIG. 14 is a cross-sectional view similar to FIG. 13, showing a state where the operation handle is operated by the first angle on the ascending side. FIG. 12 is a cross-sectional view similar to FIG. 11, showing a state where the operation handle is operated by a second angle downward. FIG. 13 is a cross-sectional view similar to FIG. 12, showing a state in which the operation handle is operated by a second angle downward. FIG. 14 is a cross-sectional view similar to FIG. 13, showing a state where the operation handle is operated by a second angle downward. FIG. 9 is a cross-sectional view taken along the line FF in FIG. It is sectional drawing similar to FIG. 20, and shows the state which has a sheet | seat in an upper limit position. It is sectional drawing similar to FIG. 20, and shows the state which has a sheet | seat in a minimum position. It is an enlarged view of the G section of FIG. It is a disassembled perspective view of the principal part of the rotation control apparatus in 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 20 of 2nd Embodiment. It is the perspective view which looked at the rotation control apparatus of 3rd Embodiment of this invention from the sheet | seat outer side. It is the perspective view which looked at the rotation control apparatus of 3rd Embodiment from the sheet | seat inner side. It is a front view of the rotation control apparatus of 3rd Embodiment. FIG. 29 is a sectional view taken along the line HH in FIG. 28. FIG. 29 is a cross-sectional view taken along the line II of FIG. It is the disassembled perspective view which looked at the rotation control apparatus from the sheet | seat outer side. FIG. 32 is an exploded perspective view showing an assembled state between some of the components shown in FIG. 31. 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 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 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.

<First Embodiment>
First, the overall configuration of the lifter device according to the first embodiment of the present invention will be described. 1 to 3 show an automobile seat (hereinafter simply referred to as a seat) 1 to which a lifter device according to a first embodiment 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 well-known one, 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 (Rotating Shaft 22 and Support Member 23)>
4 to 6 show the rotation control device 21 removed from the seat cushion 2. FIG. Hereinafter, the configuration of the rotation control device 21 will be described with reference to FIGS.

The rotation control device 21 is integrated with a cap-shaped cover 24 in a state where a generally disc-shaped intermediate member 61 is sandwiched on a support member 23 which is a base member. The cover 24 is fixed to the support member 23 together with the intermediate member 61 with its two leg portions 24 d caulked by a rivet 23 b in a through hole 23 a on the support member 23. A rotation shaft 22 is provided through the centers of the support member 23, the intermediate member 61 and the cover 24.

The rotary shaft 22 is integrally formed with a pinion gear 18 at the left end, and a claw wheel 31 is integrally formed between both ends. Further, a hexagonal portion 22 a is formed on the right side of the claw wheel 31 of the rotating shaft 22. Further, a quadrangular prism square portion 22 b is formed at the left end of the pinion gear 18. Both ends of the rotating shaft 22 are formed so as to protrude from the support member 23 and the cover 24, and the pinion gear 18 is in a position protruding from the support member 23. As shown in FIG. 8, the damper 19 is coupled to the rectangular portion 22b. The damper 19 suppresses a rapid change in the rotational speed of the rotating shaft 22 as is well known.

<Configuration of Rotation Control Device 21 (Rotation Drive Mechanism 50)>
Arc-shaped openings 24 a and 24 b are formed at the upper and lower portions of the right center portion of the cover 24. An input member 41 having a generally T shape and a flat plate shape is inserted into the openings 24a and 24b. The input member 41 is rotatably supported on the rotary shaft 22. Each end portion of the input member 41 protrudes from the openings 24 a and 24 b, and the coupling portions 41 a at both upper ends are coupled to the operation handle 20. Accordingly, when the operation handle 20 is operated in either the up or down direction, the input member 41 is rotated in the operation direction. Thus, the rotation operation angle of the operation handle 20 is limited by inserting the input member 41 into the openings 24a and 24b.

A coupling member 42 is integrally coupled to the left side surface of the input member 41 so as to be rotatable with respect to the rotary shaft 22. A drive lever 52 of the rotation drive mechanism 50 is supported at the upper end of the coupling member 42 so as to be swingable. A claw wheel 51 is provided on the left side surface of the coupling member 42, and the claw wheel 51 is fitted to the hexagonal portion 22 a of the rotation shaft 22 so as to rotate integrally with the rotation shaft 22. An engagement end 52 a that engages with the claw of the claw wheel 51 is formed at the rear end of the drive lever 52, and an engagement piece 24 c formed at the opening 24 a of the cover 24 is engaged at the front end. The engaging portion 52b that protrudes to the right is formed. A spring 42 b is hung between the drive lever 52 and the coupling member 42, and the engagement end 52 a is urged to engage with the claw of the claw wheel 51. The claw wheel 51 and the drive lever 52 constitute the rotation drive mechanism 50 of the present invention.

<Configuration of rotation control device 21 (lock mechanism 30)>
On the right side surface of the support member 23, a pair of main poles 32 and sub poles 34 are arranged in parallel around the claw wheel 31 so as to be able to engage with the claw on the outer periphery of the claw wheel 31. The pair of main poles 32 are disposed at the front and rear positions on both sides of the rotating shaft 22, and the sub pole 34 is disposed at an intermediate portion of the pair of main poles 32. The pair of main poles 32 and sub poles 34 are sandwiched between a pair of guide portions 33 and 35 provided on the support member 23, respectively. The pair of main poles 32 and sub-poles 34 are prevented from moving in the rotational direction of the rotating shaft 22 by the pair of guide portions 33 and 35 and are movably held in the radial direction of the rotating shaft 22. Accordingly, the pair of main poles 32 and sub poles 34 can be moved to a position where the pawls 31 engage with the claws and a position where the engagement is released. An annular ring spring 36 is disposed on the outer peripheral side of the pair of main poles 32 and sub-poles 34 and constantly urges the poles 32 and 34 to engage with the claws of the claw wheel 31. Engagement protrusions 32 a and 34 a are formed on the right side surfaces of the pair of main pole 32 and subpole 34.

A pole operation member 37 is provided at a position between the support member 23 and the intermediate member 61 so as to cover the pair of main pole 32 and sub pole 34 from the right side. The pawl operating member 37 is formed with guide grooves 37c and 37f for receiving the engaging projections 32a and 34a corresponding to the pawls 32 and 34, respectively. In the pole operation member 37, a protrusion 37a is formed on the opposite side of the guide groove 37f across the rotation shaft 22 so as to extend in the radial direction. A neck 37b is formed at the base of the protrusion 37a to the pole operating member 37.

The lower end portion of the coupling member 42 is bent to the left at a substantially right angle, and the tip thereof penetrates the intermediate member 61 and engages with the neck portion 37b of the pole operation member 37 in the rotation direction of the rotary shaft 22. Thus, the engaging portion 42a is formed. Therefore, when the input member 41 is rotated, the pole operation member 37 is rotated via the coupling member 42, and the positions where the pawls 32 and 34 are engaged with the claws of the claw wheel 31 and the disengaged positions are set. Move. Since the poles 32 and 34 are moved by the rotation of the pole operating member 37, the engaging grooves 37d, 37e, 37g, and 37h are formed in the guide grooves 37c and 37f so as to protrude toward the inside of the guide grooves 37c and 37f, respectively. Has been.

The claw wheel 31, the poles 32 and 34, the ring spring 36, and the pole operating member 37 constitute the lock mechanism 30 of the present invention.

<Configuration of rotation control device 21 (stopper 70)>
On the left side of the claw wheel 31 and the right side of the pinion gear 18, an outer peripheral surface portion 22 c that is coaxial with the rotary shaft 22, has a smaller diameter than the claw wheel 31, and has a larger diameter than the pinion gear 18 is formed. And the rotating shaft side protrusion 71 is integrally formed ranging over the outer peripheral surface part 22c and the left side wall surface of the claw wheel 31.

On the other hand, on the right side surface of the support member 23, on the inner diameter side of the guide portions 33 and 35, a circular guide recess 23c is formed on the outer peripheral side of the rotary shaft 22 by punching the support member 23 to the left side. The guide recess 23c is formed with two different diameter circles concentric with the rotary shaft 22. The inner peripheral surface with the larger diameter on the lower side is the sliding surface portion 23d, and the one with the smaller diameter on the upper side is the support member side protrusion 73. And the inner peripheral surface of the support member side protrusion 73 is made into the guide surface part 73b. A step is formed at a boundary portion of circles having different diameters, and an engagement surface portion 73a is formed at the step portion.

In the guide recess 23c, an annular ring 72 is rotatably fitted along the guide surface portion 73b. The ring 72 is located on the outer peripheral surface of the outer peripheral surface portion 22c. An engaging member 74 is integrally formed on a part of the circumference of the ring 72, and the first engaging portion 74 a protrudes radially inward of the engaging member 74, and second engaging outwardly in the radial direction. The part 74b protrudes. As shown in FIG. 20, when the ring 72 is rotated, the first engagement portion 74a slides on the outer peripheral surface portion 22c and engages with the rotation shaft side protrusion 71 in the rotation direction. Further, when the ring 72 is rotated, the second engaging portion 74b slides along the sliding surface portion 23d and engages with the engaging surface portion 73a in the rotation direction.

Therefore, the stopper 70 includes a rotation shaft side protrusion 71, an engagement member 74 integral with the ring 72, and a support member side protrusion 73. The outer peripheral surface portion 22c corresponds to the small-diameter side outer peripheral surface portion of the present invention, and the hook wheel 31 corresponds to the large-diameter side outer peripheral surface portion of the present invention. And the step part of this invention is formed of the outer peripheral surface part 22c and the claw wheel 31.

Note that, as shown in FIG. 23, the inner diameter of the support member side protrusion 73 in the vicinity of the engagement surface portion 73a is enlarged. Specifically, a first expansion in which a lower side (engagement surface portion 73a side) of the front-rear direction line (shown by a one-dot chain line in FIG. 23) passing through the axis of the rotating shaft 22 forms a straight line extending downward by a predetermined dimension L. It is formed by the radial surface portion 73c. Further, the lower side (engagement surface portion 73 a side) of the first diameter expansion surface portion 73 c is formed by a second diameter expansion surface portion 73 d that is an arc surface along the outline of the ring 72. FIG. 23 shows only the vicinity of the rear engagement surface portion 73a, but the inner diameter of the support member-side protrusion 73 is similarly enlarged in the vicinity of the front engagement surface portion 73a.

The reason why the inner diameter of the support member-side protrusion 73 is increased in this way is that when the ring 72 receives a force that moves in the vertical direction toward the engagement surface portion 73a, the ring 72 is sandwiched between the narrowed engagement surface portions 73a. This is to reduce the possibility of biting. That is, the distance in the front-rear direction between the pair of engagement surface portions 73a is located below the front-rear direction line (indicated by a one-dot chain line in FIG. 23) between the pair of front and rear engagement surface portions 73a. Is shorter than the outer diameter of the ring 72, the ring 72 is easily bitten. As described above, when the inner diameter of the support member-side protrusion 73 in the vicinity of the engaging surface portion 73a is enlarged, when the ring 72 receives a force for moving toward the engaging surface portion 73a, the ring 72 has the first diameter-expanding. It can move along the surface portion 73c. During this movement, the lower end of the ring 72 contacts the sliding surface portion 23d, and the movement of the ring 72 stops. Therefore, it is avoided that the ring 72 is pinched between the guide surface portions 73b of the support member-side protrusion 73 and bites. The predetermined dimension L is determined to be a dimension necessary for suppressing the biting of the ring 72 in consideration of the amount of movement until the lower end of the ring 72 comes into contact with the sliding surface portion 23d.

In particular, as shown in FIG. 23, when the rotary shaft-side protrusion 71 rotates counterclockwise and presses the first engagement portion 74a downward, the above phenomenon that the ring 72 moves downward is likely to occur. Further, when the rotation control device 21 is arranged so that the sliding surface portion 23d is on the lower side, the ring 72 is easily moved to the sliding surface portion 23d side by gravity, and thus the above phenomenon is likely to occur.

As shown by the phantom line in FIG. 23, the inner diameter of the guide recess 23c may be formed by a third enlarged surface portion 73e formed by a circular arc surface at a portion corresponding to the first expanded surface portion 73c. Further, a portion corresponding to the first enlarged surface portion 73c is formed by the fourth enlarged surface portion 73f, and the arc surface along the outline of the ring 72 as a whole from the second enlarged surface portion 73d to the fourth enlarged surface portion 73f. It is good.

<Configuration of Rotation Control Device 21 (Positioning of Pole Operation Member 37)>
On the lower side of the support member 23, at a position facing the protrusion 37a of the pole operating member 37, a protrusion 38 having a size corresponding to the protrusion 37a as a whole is formed by punching the plate material of the support member 23 from the left side. Is formed. A ring spring 62 is provided on the right side surface of the intermediate member 61. The ring spring 62 has a ring shape in which a part is cut open, and a spring force is applied to the side where the inner diameter is reduced. A pair of circular arc walls 61a are formed on the right side surface of the intermediate member 61 and concentric with the rotation shaft 22, and the ring spring 62 is held on the outer peripheral side of the circular arc walls 61a. The open end portion located at the separation portion of the ring spring 62 extends to the left side (support member 23 side), and an extended end portion 62a is formed. Each extended end 62a has a tip (left end) in contact with the surface of the support member 23 so that the protrusion 38 and the protrusion 37a are sandwiched between the extended ends 62a. Therefore, the protrusion 37 a is biased so as to be aligned with the position facing the protrusion 38 by the spring force of the ring spring 62. That is, the pole operating member 37 is in a state in which the pole operating member 37 is not rotated by the operation handle 20, and the rotation angle thereof coincides with the protrusion 38 that is the reference position.

<Operation of the rotation control device 21>
Hereinafter, the height adjusting action of the seat cushion 2 by the rotation control device 21 will be described with reference to FIGS.

11 to 13 show a neutral position state in which the operation handle 20 is not operated and the input member 41 and the pole operation member 37 are not rotated. At this time, as shown in FIG. 11, the drive lever 52 is biased by the spring 42 b and the engagement end 52 a is engaged with the claw of the claw wheel 51. In addition, as shown in FIGS. 12 and 13, the main pole 32 is pressed by the ring spring 36 and engaged with the claw wheel 31. In this state, the engagement protrusion 37d is engaged with the engagement protrusion 32a. Thus, the engagement with the claw wheel 31 is maintained. Further, the sub-pole 34 is engaged with the claw wheel 31 by the engagement protrusion 34 a being pressed in the direction of the claw wheel 31 by the engagement protrusion 37 g. Accordingly, the lock mechanism 30 is locked, the claw wheel 31 is not rotated, and the height of the seat 1 is not changed on both the ascending side and the descending side.

In such a state where the operation handle 20 is in the neutral position, the rotation angle of the pole operation member 37 is accurately aligned with the reference position by aligning the protrusion 37a with the protrusion 38.

14 to 16 show a state where the operation handle 20 is operated by the first angle U in the seat raising direction. At this time, as shown in FIG. 14, the drive lever 52 rotates the claw wheel 51 by the first angle U in a state where the engagement end portion 52 a is engaged with the claw of the claw wheel 51. Further, as shown in FIG. 15, the pole operation member 37 is also rotated by the first angle U via the coupling member 42. As a result of the rotation of the pole operating member 37, the engaging protrusion 32a of the main pole 32 is not pressed by the engaging protrusion 37d. The engagement protrusion 34a of the subpole 34 is also not pressed by the engagement protrusion 37g. Therefore, as shown in FIG. 16, the main pole 32 and the sub pole 34 are in a state of being biased by the ring spring 36 in the direction of engaging with the claw wheel 31. In this state, the claw wheel 31 rotated together with the claw wheel 51 can rotate without engaging with the claw of the main pole 32 and the sub pole 34. As a result, the pinion gear 18 is rotated to raise the seat 1 by an amount corresponding to the first angle U.

When the operation of the operation handle 20 in the seat raising direction is completed, the main pole 32 and the sub pole 34 are engaged with the claw wheel 31 by the urging of the ring spring 36. Further, since the pole operation member 37 is returned to the neutral position, the engagement protrusion 37d and the engagement protrusion 37g of the pole operation member 37 engage with the claw wheel 31 to lock the claw wheel 31.

17 to 19 show a state in which the operation handle 20 is operated from the neutral position by the second angle D in the seat lowering direction, and the pole operating member 37 is rotated from the neutral position by the second angle D in the seat lowering direction. As a result of the rotation of the pole operating member 37, the engagement protrusion 32a of the main pole 32 is not pressed by the engagement protrusion 37d, and the main pole 32 is brought into contact with the claw wheel 31 by the engagement with the engagement protrusion 37e. Move in the disengagement direction. On the other hand, the engagement protrusion 34a of the subpole 34 is not pressed by the engagement protrusion 37g, and is moved along the inclined surface of the engagement protrusion 37h. Therefore, the engagement of the main pole 32 and the sub pole 34 with the claw wheel 31 is released. Therefore, in this state, the locked state of the claw wheel 31 is released, and the claw wheel 31 is in a freely rotatable state. As a result, the pinion gear 18 is rotated and the seat 1 is lowered. At this time, since the damper 19 is connected to the pinion gear 18, the descending speed of the seat 1 is appropriately suppressed.

When the operation of the operation handle 20 in the seat lowering direction is completed, the main pole 32 and the sub pole 34 are engaged with the claw wheel 31 by the urging of the ring spring 36. Further, since the pole operation member 37 is returned to the neutral position, the engagement protrusion 37d and the engagement protrusion 37g of the pole operation member 37 engage with the claw wheel 31 to lock the claw wheel 31.

As described above, when the seat 1 is raised, by rotating the operation handle 20 in the raising direction, the ratchet wheel 51 is rotated according to the operation amount, and the seat 1 is raised. When the raising amount is insufficient, the seat 1 can be additionally raised by repeating the rotation operation of the operation handle 20.

When the ratchet wheel 31 and the rotary shaft 22 are rotated, the rotary shaft-side protrusion 71 is also rotated as shown in FIG. The ring 72 is not rotated while the first engaging portion 74a of the ring 72 is located rearward with respect to the rotation direction. However, when the rotation angle of the claw wheel 31 and the rotation shaft 22 is increased, the first engagement portion 74a is in front of the rotation shaft side protrusion 71 and is pressed by the rotation shaft side protrusion 71. 72 is rotated together with the claw wheel 31 and the rotary shaft 22. Eventually, when the height of the seat 1 reaches the upper limit position, as shown in FIG. 21, the second engagement portion 74b of the ring 72 comes into contact with the front engagement surface portion 73a, and the rotation of the ring 72 is restricted. Therefore, the rotating shaft side protrusion 71 cannot be rotated by the first engaging portion 74a, and the rotation of the ratchet wheel 31 and the rotating shaft 22 is restricted. Accordingly, the pinion gear 18 cannot rotate and the ascent of the seat 1 is stopped.

When the seat is lowered, by rotating the operation handle 20 in the downward direction, the locked state of the claw wheel 31 by the main pole 32 and the sub pole 34 is released, and the seat 1 is lowered.

FIG. 22 shows a state where the height of the seat 1 has reached the lower limit position. Until just before that, the ring 72 has its first engagement portion 74a pressed against the rotating shaft side projection 71 and rotated clockwise in FIG. 22, and the second engagement portion 74b is the rear engagement surface portion. The rotation is restricted by contacting with 73a. Therefore, the rotation of the ratchet 31 and the rotary shaft 22 is limited, the pinion gear 18 cannot be rotated, and the lowering of the seat 1 is stopped.

<Effects of First Embodiment>
According to the above-described embodiment, the rotation shaft side protrusion 71 constituting the stopper 70 is provided across the outer peripheral surface of the outer peripheral surface portion 22 c and the end surface of the claw wheel 31. When the first engagement portion 74 a of the ring 72 is engaged with the rotation shaft side protrusion 71 and functions as the stopper 70, the rotation shaft side protrusion 71 receives the force in the rotation direction of the ring 72. At this time, the rotating shaft side protrusion 71 is supported by both the outer peripheral surface of the outer peripheral surface portion 22 c and the end surface of the claw wheel 31. That is, the rotating shaft side protrusion 71 has shearing surfaces in two directions when functioning as the stopper 70. Therefore, the strength as the stopper 70 can be increased without increasing the size of the rotating shaft side protrusion 71.

Second Embodiment
Hereinafter, the configuration (stopper 70A) of the rotation control device 21A of the lifter device according to the second embodiment of the present invention will be described. FIG. 24 shows only the rotation shaft 22A, the support member 23A, and the engagement member 74A in the rotation control device 21A of the second embodiment. Since other parts are substantially the same as those in the first embodiment, description thereof is omitted. FIG. 25 is a diagram related to the second embodiment corresponding to FIG.

The feature of the second embodiment over the first embodiment is that the ring 72 is integrally provided on the engaging member 74 in the first embodiment, whereas the ring 72 is provided in the second embodiment. It is a point that does not provide. Further, as is clear from the comparison between FIG. 20 and FIG. 25, in the second embodiment, the inner diameter of the sliding surface portion 23Ad is reduced by the amount not provided with the ring 72, and the circumferential direction of the support member side protrusion 73A is reduced. The length at is shortened. Furthermore, the length in the circumferential direction of the engaging member 74A and the rotating shaft side protrusion 71A is lengthened. The other configurations are the same, and the repetitive description of the same parts is omitted.

<Effects of Second Embodiment>
In the second embodiment, since the inner diameter of the sliding surface portion 23Ad is smaller than that in the first embodiment, a distance in the planar direction from the guide portions 33A and 35A formed on the support member 23A is ensured. Therefore, the length of the sliding surface portion 23Ad in the circumferential direction can be made longer than that of the supporting member side protrusion 73A. As a result, the length in the circumferential direction of the engaging member 74A and the rotating shaft side protrusion 71A can be increased, and the strength of the engaging member 74A and the rotating shaft side protrusion 71A when functioning as the stopper 70A is ensured. It is easy. Therefore, it is possible to increase the degree of freedom in selecting the materials constituting the engaging member 74A and the rotating shaft side protrusion 71A.

Further, since the engagement member 74A is long in the circumferential direction, the engagement member 74A has the sliding surface portion 23Ad and the outer peripheral surface portion 22Ac of the rotating shaft 22A without the ring 72 as in the first embodiment. It can be supported stably during.

Furthermore, the dimension in the radial direction of the engaging member 74A is reduced by the amount that the ring 72 is not provided, and the dimension of the engaging member 74A in the radial direction of the rotating shaft 22A is from the outer peripheral surface portion 22Ac of the rotating shaft side protrusion 71A. The engagement member 74A and the outer peripheral surface portion 22Ac are calculated based on the sum of the protrusion amount of the support member side protrusion 73A from the sliding surface portion 23Ad and the clearance between the rotation shaft side protrusion 71A and the support member side protrusion 73A. And the value excluding the gap with the sliding surface portion 23Ad. Therefore, the shearing force that the engaging member 74A receives from the rotating shaft side protrusion 71A and the support member side protrusion 73A when functioning as a stopper can be reduced.

<Third Embodiment>
Hereinafter, the configuration (lock mechanism 30B) of the rotation control device 21B of the lifter device according to the third embodiment of the present invention will be described. 26 to 28 show the state where the rotation control device 21B is detached from the seat cushion 2. FIG. Hereinafter, the configuration of the rotation control device 21B will be described with reference to FIGS.

The rotation control device 21B is assembled so that the rotation shaft 22B penetrates through the center hole 23Bc of the support member 23B, which is a base member, and the pinion gear 18 protrudes from the left side surface of the support member 23B. The support member 23B is fixed to the side frame 13 with the pinion gear 18 penetrating through the through hole 13a (see FIG. 45) of the side frame 13.

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

The outer periphery of the right side surface of the lock plate 31B is formed with one protrusion 31Bd protruding in the vertical direction and two protrusions 31Be protruding in the front-back direction. Each protrusion 31Be is fitted in the through holes 32Ba and 33Ba of the respective poles 32B and 33B so that the respective poles 32B and 33B can swing around the respective protrusions 31Be. Each projection 31Bd is fitted with a winding portion 35Ba of a torsion spring 35B, and each end portion 35Bb of the torsion spring 35B is engaged with each pole 32B, 33B, and locks each pole 32B, 33B. The plate 31B is biased toward the outer peripheral side. Therefore, the engagement ends 32Bc and 33Bc of the respective poles 32B and 33B are always engaged with the internal teeth 34B of the support member 23B.

FIG. 33 shows a state in which the lock mechanism 30B is assembled to the support member 23B as described above.

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

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

The cam member 54B is generally formed in a ring shape, is provided with four pins 54Bb on the right side surface, and is formed with a cam projection 54Ba protruding above the ring-shaped inner periphery. Each pin 54Bb of the cam member 54B is fixed to the inside of the cover 24B by being fitted into the through hole of the projecting piece 24Bc of the cover 24B.

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

<Configuration of rotation control device 21B (rotation transmission plate 36B)>
A rotation transmission plate 36B is provided on the left side of the coupling member 53B, and the rotation transmission plate 36B is sandwiched between the coupling member 53B and the lock plate 31B. Four substantially square engagement holes 36Ba are formed on the surface of the rotation transmission plate 36B so as to correspond to the poles 32B and 33B. The pins 32b and 33Bb of the poles 32B and 33B are inserted into the engagement holes 36Ba so as to be engageable. In addition, two elliptical engagement holes 36Bb are formed on the surface of the rotation transmission plate 36B so as to correspond to the protrusions 31Bd. Each projection 31Bd is inserted into each engagement hole 36Bb so as to be engageable.

Furthermore, torsion springs 37B and 55B are provided around the center hole 36Bd on the right side surface of the rotation transmission plate 36B. The end portion 37Ba of the torsion spring 37B is bent to the left and is inserted into the elongated hole 36Bc of the rotation transmission plate 36B and the elongated hole 31Bc of the lock plate 31B so as to be engageable. The torsion spring 37B maintains the rotation angle of the rotation transmission plate 36B with respect to the lock plate 31B in the neutral position by the biasing force. On the other hand, the end 55Ba of the torsion spring 55B biases the protrusion 52Bd of the feed claw 52B and presses each feed claw 52B to the outer peripheral side. Further, a projection 55Bb protruding toward the right side is formed at the center of the torsion spring 55B. The protrusion 55Bb is inserted into and engaged with an engagement hole 53Bc formed at the lower center portion of the connecting member 53B. Therefore, the protrusion 52Bd of the feed claw 52B is constantly pressed by the end 55Ba of the torsion spring 55B, and the engagement end 52Ba is engaged with the internal teeth 51B of the rotation transmission plate 36B.

As described above, the input member 41B and the rotation drive mechanism 50B (the connecting member 53B, the cam member 54B, the feed claw 52B, the internal teeth 51B of the rotation transmission plate 36B, the torsion spring 55B) are assembled to the cover 24B as shown in FIG. , 37. FIG. 34 shows a state where the rotation transmission plate 36B is assembled on the lock plate 31B. 33 and 34 do not show the procedure for assembling the rotation control device 21B, but the spline 22Bc of the rotary shaft 22B is finally fitted into the spline hole 25Ba of the caulking pin 25B, and the cover 24B is further attached to the support member 23B. Assembling as a rotation control device 21B is performed.

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

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

Therefore, when the rotation shaft 22B is rotated in the downward direction by the operation of the rotation control device 21B and reaches the lower limit position, the rotation shaft side protrusion 63B sandwiches the engagement piece 62B as shown in FIG. It abuts on the end of 61B, and further rotation of the rotating shaft 22B is stopped. When the rotary shaft 22B is rotated in the upward direction and reaches the upper limit position as shown in FIG. 51, the rotary shaft side protrusion 63B is located at the end opposite to the support member side protrusion 61B with the engagement piece 62B interposed therebetween. A further portion of the rotary shaft 22B is stopped.

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

38 and 39 show a neutral position state where the operation handle 20 is not operated and the input member 41B and the connecting member 53B are not rotated. At this time, as shown in FIG. 38, the feed claw 52B is in a state where the engagement end portion 52Ba is engaged with the internal teeth 51B of the rotation transmission plate 36B by the urging of the torsion spring 55B. Further, as shown in FIG. 39, the pawls 32B and 33B of the lock mechanism 30B are brought into a state in which the engaging end portions 32Bc and 33Bc are engaged with the internal teeth 34B of the support member 23B by the urging of the torsion springs 35B. ing. Therefore, the lock mechanism 30B is locked, the lock plate 31B is not rotated, and the height of the seat 1 is not changed to the ascending side or the descending side.

<Operation of Rotation Control Device 21B (Operation for Depressing Operation Handle 20)>
40 and 41 show a state where the operation handle 20 is pushed down from the neutral position to the middle position. At this time, as shown in FIG. 40, the connecting member 53B is rotated in the arrow direction by the rotation of the input member 41B. As a result, each feed claw 52B is moved in the same direction. Therefore, the engagement end portion 52Ba of the front feed claw 52B transmits a force to the internal teeth 51B of the rotation transmission plate 36B, and rotates the rotation transmission plate 36B in the direction of the arrow. At this time, the engagement end portion 52Ba of the rear feed claw 52B is not engaged with the internal teeth 51B of the rotation transmission plate 36B. That is, in this state, the teeth of the engagement end portion 52Ba are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 51B. In addition, as the rotation transmission plate 36B rotates, the pin 52Bc of the rear feed claw 52B rides on the cam protrusion 54Ba of the cam member 54B, and the engagement end 52Ba is separated from the internal teeth 51B.

When the rotation transmission plate 36B is thus rotated, as shown in FIG. 41, the engagement hole 36Ba of the rotation transmission plate 36B engages with the pin 33Bb of each pole 33B and the engagement end portion 33Bc of each pole 33B. Is in a state separated from the internal teeth 34B of the support member 23B. That is, the lock state of the lock plate 31B in the downward direction is released. Thereafter, when the protrusion 31Bd of the lock plate 31B engages with the engagement hole 36Bb, the rotation of the rotation transmission plate 36B can be transmitted to the lock plate 31B.

<Operation of rotation control device 21B (full stroke operation of operation handle 20)>
42 and 43 show a state in which 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 53Ba of the connecting member 53B coming into contact with the circumferential end of the opening 24Ba of the cover 24B (see FIGS. 30, 32, and 33). At this time, as shown in FIG. 42, the rotation of the connecting member 53B and each feed claw 52B proceeds as compared with the state of FIG. 40, and the rotation angle of the rotation transmission plate 36B is increased by the front feed claw 52B.

When the rotation angle of the rotation transmission plate 36B is increased in this way, as shown in FIG. 43, the rotation of the rotation transmission plate 36B is transmitted to the lock plate 31B, and the lock plate 31B is rotated, as indicated by a large black arrow. The rotating shaft 22B 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 32Bc of each pole 32B is configured not to mesh with the internal teeth 34B of the support member 23B. That is, in this state, the teeth of the engagement end portion 32Bc are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 34B. Therefore, when the lock plate 31B rotates, the engagement end portion 32Bc of each pole 32B slides on the inner teeth 34B of the support member 23B. The movement of each pole 32B at this time is indicated by a solid line and a virtual line. It is also indicated by a wavy arrow.

<Operation of Rotation Control Device 21B (Influence by Gravity of Sheet 1)>
44 and 55 show a state in which the rotation of the pinion gear 18 in the seat lowering direction due to 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 36B is continuously rotated by the feed claws 52B, the state of each feed claw 52B is the same as the state of FIG. 42 as shown in FIG. On the other hand, the lock plate 31B is not rotated by the rotation transmission plate 36B, but is rotated by the rotation shaft 22B. Therefore, as shown in FIG. 45, the swinging state of each pole 33B by the engagement hole 36Ba is released, and each pole 33B is in a state in which the lock plate 31B is locked from rotating in the descending 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 33B locking the rotation of the lock plate 31B in the downward direction, a certain amount of braking is applied to the rotation of the rotary shaft 22B. It is desirable to suppress the rotation shaft 22B from being rotated by the gravity of the sheet 1 by applying the above.

<Operation of the rotation control device 21B (when the operation handle 20 is depressed)>
46 and 47 show a state where the operation handle 20 is not pushed down and returned to the neutral position. At this time, the input member 41B is returned to the neutral position by the urging force of the torsion spring 43B, and the connecting member 53B is also returned to the neutral position in synchronization. Therefore, the connecting member 53B is rotated as indicated by an arrow in FIG. Until the connecting member 53B is returned to the neutral position, the rear feed claw 52B is in a state where its pin 52Bc rides on the cam projection 54Ba of the cam member 54B. When the connecting member 53B returns to the neutral position, as shown in FIG. 46, the rear feed claw 52B returns to the state where the engagement end portion 52Ba is engaged with the internal teeth 51B of the rotation transmission plate 36B. On the other hand, in the front feeding claw 52B, the engaging end portion 52Ba slides on the inner teeth 51B of the rotation transmission plate 36B until the connecting member 53B is returned to the neutral position.

When the push-down operation of the operation handle 20 is stopped, as described above, the rotation drive by the feed claw 52B to the rotation transmission plate 36B is released, so the rotation transmission plate 36B is applied to the lock plate 31B by the urging force of the torsion spring 37B. On the other hand, it is returned to the initial position. Therefore, as shown in FIG. 47, each of the pawls 32B and 33B is in a state where the engaging end portions 32Bc and 33Bc are engaged with the internal teeth 34B of the support member 23B, and the lock plate 31B 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 Rotation Control Device 21B (Operation for Pulling Up Operation Handle 20)>
48 and 49 show a state in which the operation handle 20 is pulled up from the neutral position to the middle position. At this time, as shown in FIG. 48, the connecting member 53B is rotated in the arrow direction by the rotation of the input member 41B. As a result, each feed claw 52B is moved in the same direction. Therefore, the engagement end portion 52Ba of the rear feed claw 52B transmits a force to the internal teeth 51B of the rotation transmission plate 36B, and rotates the rotation transmission plate 36B in the same direction. At this time, the engagement end portion 52Ba of the front feed claw 52B is not engaged with the internal teeth 51B of the rotation transmission plate 36B. That is, in this state, the teeth of the engagement end portion 52Ba are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 51B. In addition, as the rotation transmission plate 36B rotates, the pin 52Bc of the front feed claw 52B rides on the cam protrusion 54Ba of the cam member 54B, and the engagement end 52Ba is separated from the internal teeth 51B.

When the rotation transmission plate 36B is thus rotated, as shown in FIG. 49, the engagement hole 36Ba of the rotation transmission plate 36B engages with the pin 32Bb of each pole 32B and the engagement end portion 32Bc of each pole 32B. Is in a state separated from the internal teeth 34B of the support member 23B. That is, the lock state of the lock plate 31B in the upward direction is released. Thereafter, when the protrusion 31Bd of the lock plate 31B is engaged with the engagement hole 36Bb, the rotation of the rotation transmission plate 36B is transmitted to the lock plate 31B. Therefore, as shown by the arrow in FIG. 49, the lock plate 31B rotates to rotate the rotating shaft 22B. As a result, the pinion gear 18 is rotated and the seat 1 is raised. At this time, the engagement end portion 33Bc of each pole 33B is not engaged with the internal teeth 34B of the support member 23B. That is, in this state, the teeth of the engagement end portion 33Bc are moved in the meshing release direction in response to a load in the normal direction of the teeth of the inner teeth 34B. Therefore, when the lock plate 31B rotates, the engagement end portion 33Bc of each pole 33B slides on the inner teeth 34B of the support member 23B.

<Operation of rotation control device 21B (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, further rotation of the rotating shaft 22B is stopped as shown in FIG.

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

This application includes a Japanese patent application filed on May 25, 2017 (Japanese Patent Application No. 2017-103697), a Japanese patent application filed on November 7, 2017 (Japanese Patent Application No. 2017-214655), and an April 27, 2018 application. This is based on the Japanese patent application (Japanese Patent Application No. 2018-086130), the contents of which are incorporated herein by reference.

The lifter device of the present invention is useful for a seat of an automobile or the like that can be adjusted in height by operating an operation handle, for example.

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 19 Damper 20 Operation handle 21, 21A, 21B Rotation control device 22, 22B Rotating shaft 22a Hexagonal portion 22b Square portion 22c, 22Ac Outer peripheral surface portion (small-diameter outer peripheral surface portion)
23, 23A Support member 23a Through hole 23b Rivet 23c Guide recess 23d, 23Ad Sliding surface 24 Cover 24a, 24b Opening 24c Engagement piece 24d Leg 30 Lock mechanism 31 Claw wheel (large-diameter outer peripheral surface)
32 Main pole (pole)
32a Engagement protrusion 33, 33A, 35, 35A Guide part 34 Subpole (pole)
34a engaging protrusion 36 ring spring 37 pole operating member 37a protrusion 37b neck 37c guide groove 37d, 37e engagement protrusion 37f guide groove 37g, 37h engagement protrusion 38 protrusion 41 input member 41a connecting part 42 connecting member 42a engaging Joint portion 42b Spring 50 Rotation drive mechanism 51 Claw wheel 52 Drive lever 52a Engagement end 52b Engagement part 61 Intermediate member 61a Arc wall 62 Ring spring 62a Extension end 70 Stopper 71, 71A Rotating shaft side protrusion 72 Ring 73 73A Support member side protrusion 73a Engagement surface portion 73b Guide surface portion 73c First expanded surface portion 73d Second expanded surface portion 73e Third expanded surface portion 73f Fourth expanded surface portion 74, 74A Engagement member 74a First engagement portion 74b Second engaging portion 21B Rotation control device 22B Rotating shaft 22Ba Outer peripheral surface 22Bb, 22Bc Spline 23B Support member 23Ba Through Hole 23Bb Guide recess 23Bc Center hole 24B Cover 24Ba Opening 24Bb Engagement piece 24Bc Projection piece 24Bd Leg 24Be Through hole 25B Caulking pin 25Ba Spline hole 25Bb Caulking end 30B Lock mechanism 31B Lock plate 31Ba Sliding surface 31Bb Spline hole 31Bc Long hole 31Bd, 31Be Protrusion 32B, 33B Pole 32Ba, 33Ba Through hole 32Bb, 33Bb Pin 32Bc, 33Bc Engagement end 34B Internal tooth 35B Torsion spring 35Ba Winding part 35Bb End 36B Rotation transmission plate 36Ba Engagement hole 36Bb Engagement hole 36Bc Long hole 36Bd Center hole 37B Torsion spring 37Ba End 41B Input member 41Ba Through hole 41Bb Center hole 42B Engagement piece 43B Torsion spring 43Ba End 50B Rotation Moving mechanism 51B Internal tooth 52B Feeding claw 52Ba Engagement end 52Bb Hinge 52Bc Pin 52Bd Projection 53B Connection member 53Ba Arm 53Bb Through hole 53Bc Engagement hole 54B Cam member 54Ba Cam projection 54Bb Pin 55B Torsion spring 55Ba End 55Bb Projection 60B Stopper 61B Support member side protrusion 62B Engagement piece 63B Rotating shaft side protrusion

Claims (7)

1. A pinion gear meshing with an input gear of a link mechanism that moves the seat up and down;
   A lift control device that controls 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;
   A rotation drive mechanism for rotating the rotation shaft so as to correspond to an operation of an operation handle for moving the seat up and down;
   A lock mechanism for locking the rotation of the rotary shaft at the operation end position of the operation handle;
   A stopper that limits the rotation of the rotary shaft at an upper limit position or a lower limit position that limits the lifting operation of the seat,
   The stopper is
   A rotating shaft side protrusion provided on the outer peripheral surface of the rotating shaft;
   A member that is slidable with respect to the outer peripheral surface of the rotating shaft and engages with the rotating shaft side protrusion in the circumferential direction of the rotating shaft when the rotating shaft is at a predetermined engaging position in the rotating direction. A joint member;
   A support member-side protrusion provided on the support member and engaged with the engagement member in the circumferential direction when the engagement member is in the engagement position;
   And when the seat is in the upper limit position or the lower limit position, the engagement member is in the engagement position, and the rotation shaft side protrusion and the support member side protrusion are Limiting the rotation of the rotating shaft by being in a state where the engaging member is sandwiched,
   Lifter device.
2. The lifter device according to claim 1,
   The rotational drive mechanism is
   The rotation shaft is provided on the rotation shaft, and when the operation handle is operated to raise the seat, the rotation shaft is rotationally driven in the upward direction, and when the operation handle is operated to lower the seat, the rotation is performed. The shaft is not rotationally driven and is in a free rotating state,
   The locking mechanism is
   Provided on the rotating shaft, when the operation handle is operated to raise the seat, the rotation of the rotating shaft is locked at the operation end position of the operation handle, and the operation handle lowers the seat When operated, the rotation of the rotating shaft is not locked and is in a free rotating state,
   The rotating shaft side protrusion is
   Provided across the outer peripheral surface of the small-diameter side outer peripheral surface portion and the end surface of the large-diameter outer peripheral surface portion adjacent to each other in the step portion formed by making the outer diameter different on the outer peripheral surface of the rotating shaft, and protrudes from the respective surfaces. ,
   The engaging member is
   Slidably supported on the outer peripheral surface of the small-diameter side outer peripheral surface portion, and engaged with the rotary shaft-side protrusion in the rotational direction of the rotary shaft,
   The support member side protrusion is
   The sliding surface portion of the support member that slidably holds the engaging member between the outer peripheral surface portion of the small diameter side and the outer peripheral surface of the small diameter side outer peripheral surface portion is opposed to the outer peripheral surface of the small diameter side outer peripheral surface portion. Formed on a concentric circle, provided such that a part of the sliding surface portion protrudes toward the outer peripheral surface portion on the small diameter side and engages with the engaging member in the rotation direction of the rotating shaft,
   Lifter device.
3. The lifter device according to claim 2,
   The dimensions of the engaging member in the radial direction of the rotating shaft are the amount of protrusion of the rotating shaft side protrusion from the small diameter outer peripheral surface portion, and the amount of protrusion of the support member side protrusion from the sliding surface portion, It is set to a value obtained by removing the gap between the engagement member, the small-diameter side outer peripheral surface portion, and the sliding surface portion from the total value of the clearance between the rotating shaft side protrusion and the support member side protrusion.
   Lifter device.
4. The lifter device according to claim 2,
   The engaging member is integrally provided with a ring formed on a concentric circle on the outer peripheral surface of the small-diameter side outer peripheral surface portion,
   The ring is configured such that an outer peripheral surface of the ring is slidable with a guide surface portion opposed to the outer peripheral surface portion on the small diameter side of the support member side protrusion, and an inner peripheral surface thereof slides on the outer peripheral surface of the rotation shaft side protrusion. It is supposed to be movable,
   Lifter device.
5. The lifter device according to claim 4,
   The support member side protrusion includes an engagement surface portion that engages with the engagement member at both ends in the rotation direction of the rotation shaft,
   The circumferential angle of the sliding surface portion of the support member sandwiched between the both engaging surface portions is smaller than 180 degrees,
   The side of the guide surface portion adjacent to each engagement surface portion has an enlarged inner diameter of the guide surface portion so that the ring can move away from the guide surface portion and move toward the sliding surface portion.
   Lifter device.
6. The lifter device according to claim 1,
   The rotational drive mechanism is
   When the operation handle is operated to raise or lower the seat, the operation force of the operation handle is transmitted to the rotating shaft to rotate the rotating shaft in the up or down direction,
   The locking mechanism is
   When the operation handle is operated to raise or lower the seat, the rotation of the rotation shaft is allowed, and the rotation of the rotation shaft is locked at the operation end position of the operation handle,
   The rotating shaft side protrusion is
   Projecting radially from the outer peripheral surface of the rotating shaft,
   The engaging member is
   An engagement piece that is slidably supported on the outer peripheral surface of the rotation shaft and engages with the rotation shaft side protrusion in the circumferential direction;
   The stopper is
   Opposing to the outer peripheral surface of the rotating shaft through a gap capable of slidably holding the engaging piece, and having a sliding surface portion provided concentrically with the outer peripheral surface of the rotating shaft,
   The support member side protrusion is
   On the support member corresponding to the inner peripheral side of the sliding surface portion, the support member is provided at a position radially away from the rotating shaft, and does not engage with the rotating shaft-side protrusion in the circumferential direction. Engage with the piece,
   When the sheet is in the upper limit position or the lower limit position, the rotation shaft side protrusions engage with each other in the circumferential direction with respect to the support member side protrusions with the engagement piece interposed therebetween. And limiting the rotation of the rotating shaft,
   Lifter device.
7. The lifter device according to claim 6,
   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 formed on the lock plate,
   Lifter device.

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