WO2013021980A1

WO2013021980A1 - Armrest

Info

Publication number: WO2013021980A1
Application number: PCT/JP2012/070032
Authority: WO
Inventors: 望月治希; 阿部龍三郎
Original assignee: テイ・エステック株式会社
Priority date: 2011-08-10
Filing date: 2012-08-07
Publication date: 2013-02-14
Also published as: US20140159461A1

Abstract

An armrest (R) attached to a seatback is provided with an arm frame (R1) and a clutch which causes the arm frame to be supported in a pivotable manner by the seatback. The clutch is provided with an inner member (inner ring (2)) which is affixed to one of the arm frame (R1) and the seatback, an outer ring (3) which is provided on the outside radially of the inner member so as to be separated from the inner member and which is affixed to the other of the arm frame (R1) and the seatback, a release member (4) which is provided so as to be capable of pivoting coaxially with both the inner member and the outer ring (3), and a release operation mechanism which releases a lock state by operating the release member (4).

Description

Armrest

The present invention relates to an armrest, and more particularly, to an armrest using a clutch capable of reducing the size in the axial direction.

In a passenger car, an armrest may be provided on the seat. As described in Patent Document 1, some of the improved armrests are locked to rotate downward at the use angle, and freely rotate up and down at other non-use angles. It is configured to be able to.

The armrest described in Patent Document 1 adopts a configuration in which a coil spring is wound around the outer periphery of a shaft as a one-way clutch mechanism that locks downward rotation. In this configuration, the rotation in the direction in which the coil spring is tightened utilizes the fact that the rotation of the coil spring relative to the shaft is locked, and conversely, the rotation in the direction in which the coil spring loosens is free.

JP 2009-261828 A

However, as disclosed in Patent Document 1, a one-way clutch mechanism using a coil spring has a problem that the axial size of the coil spring increases. A roller type one-way clutch mechanism with a roller interposed between the inner ring and the outer ring can be relatively small in the axial direction, but only within a predetermined angular range by a predetermined rotational movement of the inner ring or outer ring. The structure for releasing the one-way clutch function was not known.

The present invention has been made in view of the above background, and an object thereof is to provide an armrest using a clutch capable of reducing the size in the axial direction.

Another object of the present invention is to provide an armrest that can be reduced in weight. It is another object of the present invention to provide an armrest that can suppress the formation of a locally weak portion even when the weight is reduced.

It is another object of the present invention to provide an armrest that can suppress an excessive radial load on the inner ring and the outer ring.
It is another object of the present invention to provide an armrest that can be easily unlocked to improve usability.

It is another object of the present invention to provide a one-way clutch that can reduce the size in the axial direction as a clutch used for an armrest, and that can disengage the inner ring and the outer ring by a predetermined operation and can be idled.

It is another object of the present invention to provide a one-way clutch capable of suppressing an excessive radial load on the inner ring and the outer ring.
It is another object of the present invention to provide a one-way clutch that can be easily unlocked to improve usability.

Also, the purpose is to reduce the weight and improve the rigidity of each member constituting the one-way clutch. It is another object of the present invention to provide a one-way clutch that can easily manufacture each member constituting the one-way clutch and reduce the number of parts.

In order to solve the above-described problems, an armrest according to the present invention is an armrest attached to a seatback, and includes an arm frame and a clutch that rotatably supports the arm frame on the seatback. An inner member fixed to one of the arm frame and the seat back, and provided radially outside the inner member, spaced from the inner member, and fixed to the other of the arm frame and the seat back. An outer ring, a release member that is coaxially rotatable with respect to both the inner member and the outer ring, and a release operation mechanism that releases the locked state by operating the release member. .

According to the armrest having such a configuration, since the shaft and the coil spring are not used, the size in the axial direction can be reduced.

In the armrest described above, the inner member is an inner ring, and includes a movable piece housed in a pocket having a portion that is located between the inner ring and the outer ring and decreases in the radial direction toward one side in the circumferential direction. The release member has a release piece disposed adjacent to the one side in the circumferential direction with respect to the movable piece, and the release operation mechanism operates the release member so that the movable piece is in the pocket. The lock state clamped by the inner wall of the is released.

According to the armrest having such a configuration, without using a shaft and a coil spring, the armrest that can be locked by the movable piece accommodated in the pocket and can be released by the release member and the release operation mechanism can be obtained. it can. Therefore, the size in the axial direction can be reduced.

In the armrest described above, the clutch is a one-way clutch, and the release operation mechanism rotates coaxially with both the first operation member engaged or fixed to the release member and both the inner ring and the outer ring. And a switching member having a peripheral surface, wherein the first operating member abuts on the peripheral surface of the switching member, and the switching member includes a small-diameter portion as the peripheral surface, and the small-diameter portion. One of the inner ring and the outer ring has a rotation restricting portion that engages with the switching member and restricts relative rotation with respect to the switching member within a predetermined angle range, A return engagement portion that protrudes in the radial direction is provided on the peripheral surface, and the first operating member abuts on one of the small diameter portion and the large diameter portion, thereby causing the release member to move in the circumferential direction. Rotate to one side and allow A piece can be held and locked by the inner wall of the pocket, and the first operating member abuts against the other of the small diameter part and the large diameter part to rotate the release member in the other circumferential direction. It can be configured to move and release the lock of the movable piece.

According to such a configuration, when one of the inner ring and the outer ring is rotated with respect to the other, the switching member is rotated relative to the first operation member in conjunction with the outer ring and one of the inner rings. Therefore, when one of the inner ring and the outer ring is rotated, the contact point of the first operating member with the peripheral surface of the switching member depends on the phase (direction) of the switching member between the large diameter portion and the small diameter portion. To switch. Then, the release member is slightly rotated in the circumferential direction because the first operating member is engaged with or fixed to the release member. As a result, when the release piece of the release member rotates to one side or the other in the circumferential direction and to the other side (the direction in which the width of the pocket in the radial direction decreases), the movable piece is placed in the pocket. It is pinched and locked. That is, the inner ring and the outer ring are engaged with each other so that they do not rotate. Further, when the release piece rotates to the other side in the circumferential direction, the release piece pushes the movable piece toward the wider pocket and the lock is released. That is, the inner ring and the outer ring can freely rotate with respect to each other.

Thus, according to the present invention, locking and unlocking can be realized by rotating the armrest in the armrest provided with the movable piece in the pocket.

Further, the inner ring or the outer ring having the rotation restricting portion can freely rotate with respect to the switching member as long as the relative rotation with the switching member is not restricted by the rotation restricting portion. On the other hand, in the range where the rotation is restricted, the inner ring or the outer ring having the rotation restricting portion rotates integrally with the switching member. When the switching member and one of the inner ring and the outer ring rotate together, the switching member and the first operating member rotate relatively so that the contact point of the circumferential surface of the first operating member with the switching member becomes the small diameter portion. And appropriately switch between the large diameter part. In this configuration, the peripheral surface is provided with a return engagement portion that protrudes in the radial direction. For example, once the inner ring or the outer ring is rotated, the return engagement portion is overcome. The first operating member in contact with the large-diameter portion rotates the switching member in the reverse direction when the first operating member is engaged with the return engaging portion when one of the inner ring and the outer ring is reversely rotated. Can be made. That is, the switching member can rotate not only in one direction relative to the inner ring or the outer ring but also in the reverse direction, so that one of the inner ring and the outer ring moves back and forth with respect to the other. Such an operation can be realized. In this back-and-forth movement, the inner ring and the outer ring are switched between the locked state and the unlocked state depending on whether the first operating member contacts the large-diameter portion or the small-diameter portion of the peripheral surface of the switching member. Can do.

Note that the fact that the switching member rotates relative to the first operating member includes the case where the switching member is stopped and the first operating member rotates when viewed from the outside. It is. In such a case, the switching member is relatively rotated with respect to the first operation member.

In the armrest described above, the inner ring includes a first metal part that constitutes a part of the inner wall of the pocket and a first resin part, and is formed on the inner periphery of the first metal part. The first metal component and the first resin component are combined so that they do not shift in the circumferential direction due to the engagement between the unevenness and the unevenness formed on the outer periphery of the first resin component. Can do.

According to such a configuration, it is possible to reduce the weight by using the first resin component while giving the inner metal the necessary strength with the first metal component.

Further, in the above-described configuration, a biasing member arranged to bias the movable piece toward one side in the circumferential direction is further provided, and the inner ring includes a first part constituting an inner wall of the pocket. 1 metal component and a first resin component, and by engagement between the unevenness formed on the inner periphery of the first metal component and the unevenness formed on the outer periphery of the first resin component. The first metal part and the first resin part are combined so as not to be displaced from each other in the circumferential direction, and the first metal part is directed toward the center for holding the biasing member on the outer periphery. A biasing member holding recess that is concave and has a configuration in which a convex shape that is convex toward the center is located on the radially inner side of the biasing member holding recess. Is desirable.

According to such a configuration, not only can the first metal part have the necessary strength of the inner ring and the first resin part can be used to reduce the weight, but also the first metal part can be reduced in weight. A width in the radial direction can be secured to prevent the first metal part from being locally weak.

In the armrest of the present invention described above, the outer ring includes a second metal part that constitutes a part of the inner wall of the pocket and a second resin part, and is formed on the outer periphery of the second metal part. The second metal part and the second resin part are combined so that they are not displaced in the circumferential direction by the engagement between the unevenness and the unevenness formed on the inner periphery of the second resin part. It can be.

According to such a configuration, it is possible to reduce the weight by using the second resin component while giving the second metal component the necessary strength of the outer ring.

In this configuration, when the clutch is in a locked state, a convex shape that is convex toward the radially outer side of the concave and convex portions of the second metal part is located on the radially outer side of the movable piece. desirable.

In this way, the contact pressure of the movable piece can be received at a portion where the rigidity of the second metal part is high, and the strength of the second metal part can be ensured.

In the armrest of the present invention described above, the release member has an extension portion extending radially outward, the first operating member is engaged with the release member in the extension portion, and the outer ring It is desirable that the outer ring is disposed outside in the radial direction and overlaps with the outer ring in the axial direction.

According to such a configuration, since the first operating member is located outside the outer ring in the radial direction and overlaps with the outer ring in the axial direction, the size in the axial direction is small even with the first operating member. Hard to get bigger. That is, it is possible to achieve a compact size in the axial direction.

In the armrest of the present invention described above, a protrusion is provided on the inner wall of the pocket on the one side in the circumferential direction with respect to the movable piece, and the protrusion is forced during relative rotation of the inner ring and the outer ring in the locking direction. It is desirable that the movable piece is in contact with the movable piece.

According to such a configuration, when the inner ring and the outer ring are forcibly rotated in the locking direction, the movable piece is not strongly held by the inner wall of the pocket due to the contact between the protrusion and the movable piece. It can suppress that a radial load is applied.

In the armrest of the present invention described above, the release operation mechanism includes a second operation member that is engaged with or fixed to the release member and extends toward the tip of the arm frame. By rotating the release member to the other side in the circumferential direction by an operation, the movable piece can be unlocked.

According to such a configuration, not only locking and unlocking by a predetermined relative rotation between the inner ring and the outer ring but also unlocking can be performed by operating the second operating member, so that ease of use is improved. be able to.

In the armrest of the present invention described above, the release operation mechanism includes a second operation member that is engaged with or fixed to the release member and extends toward the tip of the arm frame. The movable member is configured to be unlocked by rotating the release member to the other in the circumferential direction by an operation, and the first operation member is provided in an arc shape around the rotation axis of the arm frame. The second operation member is provided along the longitudinal direction of the arm frame, and the first operation member and the second operation member are arranged so as not to overlap each other when viewed from the axial direction. Is desirable.

In this way, the first operation member and the second operation member are arranged so as not to overlap each other when viewed from the direction of the rotation axis of the armrest, thereby providing the first operation member and the second operation member. In this case, it is possible to suppress an increase in the size in the axial direction.

In the armrest described above, it is desirable that the small diameter portion and the large diameter portion are formed as a flange formed by extending the peripheral edge of the switching member in the axial direction.

According to such a configuration, the sliding contact surface with the contact portion can be widened while reducing the weight of the switching member.

In this armrest, it is desirable that the flange forming the small diameter portion and the flange forming the large diameter portion are continuous. Thereby, the rigidity of the switching member can be improved.

In the armrest described above, it is desirable that the return engagement portion is formed integrally with the switching member. Thereby, manufacture of a return engagement part is easy and can reduce a number of parts.

Further, in the armrest described above, it is desirable that the extension portion is formed integrally with the release member. Thereby, manufacture of an extension part is easy and can reduce a number of parts.

In the armrest having the extension portion in the release member, the first attached member is fixed to the inner ring, the second attached member is fixed to the outer ring, the first attached member and the second attached member. One of the members protrudes toward the one-way clutch and engages with the inner ring or the outer ring fixed to the other of the first and second attached members to restrict the one rotation range. Preferably, the stopper is provided in a range that overlaps with the extending portion in the axial direction, and is provided in a range that does not overlap with the extending portion when viewed from the axial direction.

As described above, the extension portion and the stopper are provided in a range where they do not overlap each other when viewed from the axial direction, and the size of the armrest in the axial direction can be made more compact by providing the extension portion and the stopper in a range where they overlap in the axial direction.

Further, the clutch used for the armrest described above has an inner ring, an outer ring provided radially outward of the inner ring and spaced apart from the inner ring, and is positioned between the inner ring and the outer ring and has a diameter toward the one in the circumferential direction. A movable piece housed in a pocket having a portion with a smaller width in the direction, a release member provided so as to be rotatable coaxially with respect to both the inner ring and the outer ring, and a first member engaged or fixed to the release member. A one-way clutch comprising a switching member having a peripheral surface that rotates relative to the first operating member in conjunction with one of the inner ring and the outer ring. Has a release piece disposed adjacent to the one side in the circumferential direction with respect to the movable piece, the first operating member abuts on the peripheral surface of the switching member, and the switching member is A small-diameter portion as the peripheral surface, A large-diameter portion that is larger than the small-diameter portion, and the first operating member abuts on one of the small-diameter portion and the large-diameter portion to rotate the release member to the one in the circumferential direction. The movable piece can be clamped and locked in the pocket, and the release member can be rotated in the other circumferential direction by the first operating member coming into contact with the other of the small diameter portion and the large diameter portion. It is configured to release the lock of the movable piece.

According to such a configuration, when one of the inner ring and the outer ring is rotated with respect to the other, the switching member rotates relative to the first operation member in conjunction with one of the inner ring and the outer ring. Therefore, when one of the inner ring and the outer ring is rotated, the contact point of the first operating member with the peripheral surface of the switching member depends on the phase (direction) of the switching member between the large diameter portion and the small diameter portion. To switch. Then, the release member is slightly rotated in the circumferential direction because the first operating member is engaged with or fixed to the release member. As a result, when the release piece of the release member rotates to one side or the other in the circumferential direction and to the other side (the direction in which the width of the pocket in the radial direction decreases), the movable piece is placed in the pocket. It is pinched and locked. That is, the inner ring and the outer ring are engaged with each other so that they do not rotate. Further, when the release piece rotates to the other side in the circumferential direction, the release piece pushes the movable piece toward the wider pocket and the lock is released. That is, the inner ring and the outer ring can freely rotate with respect to each other.

As described above, according to the present invention, in the one-way clutch in which the movable piece is provided in the pocket, locking and unlocking can be realized by rotating either the inner ring or the outer ring. That is, the size of the one-way clutch in the axial direction can be reduced, and the engagement between the inner ring and the outer ring can be released by a predetermined operation so that the one-way clutch can idle.
Note that the fact that the switching member rotates relative to the first operating member includes the case where the switching member is stopped and the first operating member rotates when viewed from the outside. It is. In such a case, the switching member is relatively rotated with respect to the first operation member.

In the above-described one-way clutch, the switching member is provided so as to be rotatable with respect to both the inner ring and the outer ring, and one of the inner ring and the outer ring is engaged with the switching member and is relative to the switching member. A rotation restricting portion that restricts rotation within a predetermined angle range may be provided, and a return engagement portion that protrudes radially outward may be provided on the peripheral surface.

According to such a configuration, the inner ring or the outer ring having the rotation restricting portion can freely rotate with respect to the switching member as long as the relative rotation with the switching member is not restricted by the rotation restricting portion. On the other hand, in the range where the rotation is restricted, the inner ring or the outer ring having the rotation restricting portion rotates integrally with the switching member. When the switching member and one of the inner ring and the outer ring rotate together, the switching member and the first operating member rotate relatively so that the contact point of the circumferential surface of the first operating member with the switching member becomes the small diameter portion. And appropriately switch between the large diameter part. In this configuration, the peripheral surface is provided with a return engagement portion that protrudes in the radial direction. For example, once the inner ring or the outer ring is rotated, the return engagement portion is overcome. The first operating member in contact with the large-diameter portion rotates the switching member in the reverse direction when the first operating member is engaged with the return engaging portion when one of the inner ring and the outer ring is reversely rotated. Can be made. That is, the switching member can rotate not only in one direction relative to the inner ring or the outer ring but also in the reverse direction, so that one of the inner ring and the outer ring moves back and forth with respect to the other. Such an operation can be realized. In this back-and-forth movement, the inner ring and the outer ring are switched between the locked state and the unlocked state depending on whether the first operating member contacts the large-diameter portion or the small-diameter portion of the peripheral surface of the switching member. Can do.

In the one-way clutch described above, the release member has an extension portion extending radially outward, the first operation member is engaged with the release member in the extension portion, and the diameter of the outer ring is increased. It is desirable to arrange in a range that overlaps the outer ring in the axial direction and on the outer side in the direction.

In the one-way clutch described above, the inner wall of the pocket is provided with a protrusion on the one side in the circumferential direction with respect to the movable piece, and the protrusion and the protrusion during the forced relative rotation in the locking direction of the inner ring and the outer ring It is desirable that the movable piece is configured to contact.

The one-way clutch described above further includes a second operation member engaged or fixed to the release member, and by rotating the release member in the circumferential direction by operating the second operation member, It is desirable that the inner ring and the outer ring can be unlocked.

In the above-described one-way clutch, it is desirable that the small diameter portion and the large diameter portion are formed as a flange formed by extending the peripheral edge of the switching member in the axial direction.

In this one-way clutch, it is desirable that the flange forming the small diameter portion and the flange forming the large diameter portion are continuous. Thereby, the rigidity of the switching member can be improved.

In the above-described one-way clutch, it is desirable that the return engagement portion is integrally formed with the switching member. Thereby, manufacture of a return engagement part is easy and can reduce a number of parts.

Further, in the above-described one-way clutch, it is preferable that the extension portion is formed integrally with the release member. Thereby, manufacture of an extension part is easy and can reduce a number of parts.

In the one-way clutch in which the release member has an extending portion, a first attached member is fixed to the inner ring, a second attached member is fixed to the outer ring, and the first attached member and the second attached member are fixed. One of the mounting members protrudes toward the one-way clutch and engages with the inner ring or the outer ring fixed to the other of the first mounted member and the second mounted member to provide the one rotation range. Preferably, the stopper is provided in a range that overlaps with the extending portion in the axial direction, and is provided in a range that does not overlap with the extending portion when viewed in the axial direction.

As described above, the extension portion and the stopper are provided in a range that does not overlap each other when viewed from the axial direction, and the size in the axial direction of the one-way clutch can be made more compact by providing the extension portion and the stopper in a range that overlaps in the axial direction.

It is a perspective view of the sheet | seat provided with the armrest. It is a left view explaining operation | movement of an armrest, (a) At the time of storage operation, (b) At the time of drawer operation is shown. It is a disassembled perspective view of an armrest. 4A is a right side view of the outer ring, and FIG. 4B is a sectional view taken along line IV-IV in FIG. It is a figure which shows the internal structure of a one-way clutch. It is a figure explaining operation | movement of a roller, (a) is the time of rotation to a non-locking direction, (b) shows the time of rotation to a locking direction, (c) shows the time of unlocking. It is the left view (a) of a one-way clutch when an armrest exists in a drawer position (position A), and the figure (b) which looked at the one-way clutch from the bottom. It is a left view of the one-way clutch in a locked state when an armrest exists in the position B vicinity. It is a left view of the one-way clutch in an unlocked state when the armrest is near position B. It is a left view of the one-way clutch in an unlocked state when the armrest is in the storage position (position C). FIG. 6 is a left side view of the one-way clutch in which the armrest is unlocked in the vicinity of position A when the armrest is rotated from the storage position toward the drawing position. It is an enlarged view near the roller of the one-way clutch which concerns on a modification.

Next, an embodiment of an armrest as a movable member according to the present invention will be described with reference to the attached drawings. As shown in FIG. 1, the seat S includes a seat back S1 and a seating portion S2, and an armrest (first attached member) R is seat back (second attached member) by a one-way clutch 1 as an example of a clutch. It is fixed to S1. Below, as shown in FIG. 1, the case where the armrest R provided in the right side of seat back S1 is seen from the left side is demonstrated. In this specification, front and rear, right and left, and top and bottom are based on a person sitting on the seat S. For example, a view of the armrest R viewed from the left (such as FIG. 2) is a left side view for convenience.

As shown in FIGS. 2A and 2B, the armrest R can be rotated between a pulled-out state (position A) with the tip facing forward and a stored state (position C) with the tip facing upward. It is. Then, at the time of the storage operation that is operated from the drawer state to the storage state, as shown in FIG. 2A, a predetermined angle range (range from the position A to the position B) from the drawer state to the storage state. The armrest R can be raised up, but cannot be lowered down. This inability to be lowered is referred to as being locked (locked state) in this specification. During the storage operation, the armrest R can be rotated up and down from position B to position C. This is referred to as unlocking (non-locking state) in this specification. As shown in FIG. 2B, the armrest R can be freely moved up and down at the time of a drawer operation for moving from the housed state (position C) toward the drawer state (position A). . That is, it is in an unlocked state.
Further, the armrest R returns to the locked state when it is completely moved to the position A during the pull-out operation. In addition to the above-described operation, the armrest R can be unlocked in an arbitrary posture by pressing the lower end portion of the operation lever R2 provided at the tip.

A configuration for realizing the function of the armrest R as described above will be described.
As shown in FIG. 3, the armrest R includes an arm frame R1 made of resin, and a cushion and an outer skin are provided outside the arm frame R1, although not shown. The arm frame R1 has a long shape in the front and rear direction in FIG. 3, and is attached to the seatback S1 via the one-way clutch 1 by a bolt or the like (not shown) at the rear end. A resin inner ring 2B as an example of a first resin member is formed on the left side of the arm frame R1 as a part of the inner ring 2 constituting the one-way clutch 1 on the left side. On the outer periphery of the resin inner ring 2B, an uneven shape portion (unevenness) 21B is formed by different outer diameters at a constant pitch.
On the radially outer side of the resin inner ring 2B, stoppers R4 that protrude toward the left side (one-way clutch 1 side) are formed at two locations across the resin inner ring 2B. The stopper R4 engages in a circumferential direction with a stopper 38 of an outer ring 3 (the inner ring 2 and the outer ring 3 that is fixed to the seat back S1), which will be described later, so that the relative rotation range of the outer ring 3 and the arm frame R1 is increased. It is for regulating.

The one-way clutch 1 includes an inner ring 2, an outer ring 3, a roller 71 as an example of a movable piece, and a spring 72 as an example of an urging member. The release member 4, the switching member 5, and the operation rod 6 are provided as a release operation mechanism that releases the locked state in which the roller 71 is held between the inner walls of the pocket PK.

The inner ring 2 includes a metal inner ring 2A as an example of the first metal component and the resin inner ring 2B. The metal inner ring 2A has a concavo-convex shape portion (unevenness) 21A on the inner periphery of the central through hole, and the concavo-convex shape portion 21B of the resin inner ring 2B and the concavo-convex shape portion 21A of the metal inner ring 2A are engaged. The metal inner ring 2A and the resin inner ring 2B are combined so as not to be displaced in the circumferential direction. Thereby, the inner ring 2 is fixed to the arm frame R1. Further, as described above, the inner ring 2 combines the metal inner ring 2A and the resin inner ring 2B, so that the weight can be reduced while providing the necessary strength.

As shown in FIG. 5, the metal inner ring 2 A has three roller holding portions 26 that protrude radially outward at equal angular intervals. A recess that is recessed toward the center is formed on the outer peripheral surface of the roller holding portion 26, and the recess is clockwise in FIG. 5 (hereinafter, clockwise and counterclockwise are based on FIG. 5). An inclined surface 22 whose radius gradually increases as it goes forward, and an urging member holding recess 23 that is recessed toward the center of the inclined surface 22 adjacent to the counterclockwise end of the inclined surface 22. Is formed. Further, a locking portion 24 that defines the positional relationship between a release piece 41 and a metal inner ring 2 A, which will be described later, is provided at the end of the inclined surface 22 in the clockwise direction. Further, a regulating wall 25 for regulating the posture of the spring 72 is provided on the counterclockwise direction side of the biasing member holding recess 23.
In addition, on the radially inner side of the urging member holding recess 23, a convex shape (a convex portion on the radially inner side, see reference numeral 21X in FIG. 5) of the concave and convex portion 21A on the inner periphery of the metal inner ring 2A described above. positioned. Thereby, the width in the radial direction of the metal inner ring 2A is secured, and the formation of a locally weak portion on the metal inner ring 2A is suppressed.

The outer ring 3 is provided on the outer side in the radial direction of the metal inner ring 2A so as to be separated from the inner ring (metal inner ring 2A) 2. An inner periphery 31 of the outer ring 3 forms a cylindrical surface, and a pocket PK in which the roller 71 and the spring 72 are accommodated is formed between the inclined surface 22 of the metal inner ring 2A and the inner periphery 31 of the outer ring 3. Since the inner diameter 31 of the outer ring 3 is a cylindrical surface, the outer diameter increases as the inclined surface 22 moves in the clockwise direction, so that the pocket PK has a radial width equal to one in the circumferential direction (clockwise). It has a portion that becomes smaller as it goes in the direction of rotation).

The release piece 41 is disposed adjacent to one side (clockwise direction side) of the roller 71 in the circumferential direction. The release piece 41 is a member included in the release member 4 described above. On the other side (counterclockwise direction side) of the roller 71 in the circumferential direction, a spring 72 made of a substantially U-shaped leaf spring is disposed adjacently. As shown in an enlarged view in FIG. 6A, the spring 72 is held in the biasing member holding recess 23 at the bent portion 72A, one arm 72B abuts against the restriction wall 25, and the other arm 72C. Urges the roller 71 in the clockwise direction. Due to this urging force, the roller 71 comes into contact with the inner wall (the inclined surface 22 and the inner periphery 31) of the pocket PK, and rattling is prevented. The biasing force of the spring 72 is weak enough to prevent the roller 71 from rattling. The roller 71 bites against the inner wall of the pocket PK to lock the relative rotation of the inner ring 2 and the outer ring 3. Not enough to do.

As shown in FIGS. 4A and 4B, the outer ring 3 includes a metal outer ring 3A as an example of a second metal member and a resin outer ring 3B as an example of a second resin member.
As described above, in the metal outer ring 3A, the inner periphery 31 is formed of a cylindrical surface, and the outer periphery has uneven portions (uneven portions) 32A formed by different outer diameters at a constant pitch. The resin outer ring 3B is formed with an uneven shape portion 32B corresponding to the uneven shape portion 32A on the inner periphery, and the uneven shape portion 32A of the metal outer ring 3A and the uneven shape portion 32B of the resin outer ring 3B are engaged. The metal outer ring 3A and the resin outer ring 3B are combined so as not to be displaced in the circumferential direction. Thus, the outer ring 3 combines the metal outer ring 3 A and the resin outer ring 3 B, so that weight reduction can be achieved while providing necessary strength. When the one-way clutch 1 is in a lockable state, that is, when the armrest R is in the range from the position A to the position B at the time of the storing operation shown in FIG. Of the concavo-convex shape portion 32A on the outer periphery of the outer ring 3A, it is desirable that a convex shape (a portion protruding radially outward) is located. By doing in this way, the contact pressure of the roller 71 can be received in the portion where the rigidity of the metal outer ring 3A is high, and the strength of the metal outer ring 3A can be ensured.

As shown in FIG. 3, a support shaft 34 protruding in a circular shape is provided on the left side surface of the resin outer ring 3B. Further, the support shaft 34 is provided with a protrusion 39 that engages with the seat back S1 to prevent the outer ring 3 from rotating with respect to the seat back S1. In addition, two stoppers 38 (see FIG. 4A) projecting radially outward are provided on the outer periphery of the resin outer ring 3B. Further, a rotation restricting portion 35 for restricting the relative rotation with respect to the switching member 5 within a predetermined angle range is provided protruding from the outer edge portion of the right side surface of the resin outer ring 3B.

The release member 4 is a member for releasing the lock caused by the roller 71 being pinched by the inner wall of the pocket PK. The release member 4 is made of a plate-shaped ring member as shown in FIG. 3, and has an extending portion 42 that extends radially outward, downward in FIG. The extending part 42 can be easily manufactured by molding integrally with the main body of the release member 4, and the number of parts can be reduced. And the cancellation | release member 4 is the state combined with the resin inner ring | wheel 21B, and the extension part 42 is located between two stoppers R4. Specifically, the extending portion 42 is in a range that overlaps with the stopper R4 in the axial direction, and further, in a range that does not overlap with the stopper R4 when viewed in the axial direction, as shown in FIGS. 7A and 8 to 10. Is provided. Thereby, space can be used effectively and the size of the one-way clutch 1 (armrest R) in the axial direction can be made more compact.

The extending portion 42 is provided with an engaging protrusion 43 with which the operation rod 6 is engaged. The inner peripheral portion 44 of the release member 4 has a diameter corresponding to the outer diameter of the resin inner ring 2B, and the release member 4 is coaxial with the inner ring 2 by fitting the inner peripheral portion 44 to the resin inner ring 2B. It is provided so that rotation is possible. Further, since the inner ring 2 and the outer ring 3 are rotatable relative to each other, and the release member 4 and the outer ring 3 are not fixed to each other, the release member 4 rotates coaxially with respect to both the inner ring 2 and the outer ring 3. Is possible.
On the left side surface of the release member 4, the release piece 41 is provided so as to protrude corresponding to each roller 71.

The switching member 5 is a member for switching between locking and unlocking of the inner ring 2 and the outer ring 3 (of the roller 71) by the rotation operation of the armrest R in cooperation with the operation rod 6. The switching member 5 is formed of a plate-shaped ring member, and is rotatable with respect to the outer ring 3 by engaging a circular inner peripheral portion 54 with the support shaft 34 of the outer ring 3. Of the outer periphery of the switching member 5, a regulating wall 56 and a regulating wall 57 projecting outward in the radial direction are respectively formed on the front diagonally lower side and the lower side. As shown in FIG. When 5 is combined with the outer ring 3, the rotation restricting portion 35 of the outer ring 3 is positioned between the restriction wall 56 and the restriction wall 57. That is, the switching member 5 and the outer ring 3 are relatively rotatable in a range in which the rotation restricting portion 35 contacts the restricting wall 56 and the restricting wall 57. Moreover, since the outer ring 3 and the inner ring 2 are relatively rotatable and the switching member 5 is not engaged with the inner ring 2, the switching member 5 is rotatable with respect to both the inner ring 2 and the outer ring 3. is there. When the rotation restricting portion 35 is in contact with the restricting wall 56 or the restricting wall 57, the outer ring 3 and the switching member 5 can rotate integrally in the rotating direction of contact.

Among the outer peripheral surface of the switching member 5, a small diameter portion 51 that is coaxial with the inner peripheral portion 54 extends from the rear side to the upper side in FIG. 3. The small-diameter portion 51 has a flange shape in which the peripheral edge of the switching member 5 extends in the axial direction (left side), reduces the weight of the switching member 5, and slides on the contact portion 63 of the operation rod 6 described later. The contact surface is widely secured. Further, in the outer periphery of the switching member 5, from the rear side to the lower regulating wall 57 in FIG. 3, it is coaxial with the inner peripheral portion 54 and has a large diameter portion 52 slightly larger in diameter than the small diameter portion 51. . As shown in FIG. 7B, the large-diameter portion 52 has a flange shape in which the periphery of the switching member 5 extends in the axial direction (left side) in the same manner as the small-diameter portion 51, and the contact portion of the operating rod 6 The sliding contact surface with 63 is secured. Since the flange shape of the small diameter portion 51 and the flange shape of the large diameter portion 52 are continuous, the rigidity of the peripheral edge portion of the switching member 5 is high.

A connecting portion between the small-diameter portion 51 and the large-diameter portion 52 in the peripheral surface of the switching member 5 is provided with a return engagement portion 53 that protrudes in a small mountain shape toward the outside in the radial direction. The return engagement portion 53 is formed integrally with the main body of the switching member 5 at the flange portion that forms the small diameter portion 51 and the large diameter portion 52. Thereby, the return engaging part 53 can be manufactured easily and the number of parts can be reduced. Further, the restriction wall 57 is adjacent to the end portion in the clockwise direction of the large-diameter portion 52 and protrudes radially outward from the large-diameter portion 52, so that the abutting portion 63 is on the large-diameter portion 52. When sliding, the sliding range of the contact part 63 is limited.

The operating rod 6 is a member for operating the rotation of the armrest R and the locking and unlocking of the roller 71 according to the operation of the user by cooperating with the switching member 5. The operating rod 6 is made of a metal rod having a rigidity that can be slightly bent and deformed, and extends from the front end of the first operating portion 61 to the first operating portion 61 as an example of a first operating member that extends in an arc shape. A second operating portion 62 as an example of a second operating member extending linearly along the longitudinal direction of the arm frame R1 toward the tip of the frame R1. In the present embodiment, the first operation unit 61 and the second operation unit 62 are configured integrally, and do not overlap each other when viewed from the axial direction of the armrest R. For this reason, the armrest R is made compact in the axial direction. Further, the second operation portion 62 is provided along the lower edge of the arm frame R1, and the extending portion 42 of the release member 4 extends downward, so that these are the portions of the arm frame R1. Compared to the case where the armrest R is provided on the upper side, the armrest R can be prevented from protruding upward.

An engagement hole 69 is formed in the connection portion between the first operation portion 61 and the second operation portion 62, and the engagement hole 69 engages with the engagement protrusion 43 provided in the extension portion 42 of the release member 4. Yes. The first operating portion 61 is disposed on the outer side in the radial direction of the outer ring 3 and in a range overlapping with the outer ring 3 in the axial direction (see FIG. 7B). For this reason, even if the 1st operation part 61 is provided, the magnitude | size of the axial direction of the one-way clutch 1 does not become large, and the one-way clutch 1 can be made compact in an axial direction. The first operation portion 61 extends 90 degrees from the bottom to the rear in FIG. 7A along the outer periphery of the outer ring 3 from the engagement hole 69, extends in an arc shape, and is bent to the left at the tip. 63 is in contact with the outer peripheral surface of the switching member 5 (the small diameter portion 51 in FIG. 7A) from the outside in the radial direction. The contact part 63 is provided with a bent shape, so that the rigidity is improved. The position of the contact portion 63 with respect to the engagement hole 69 is not limited to the case where it is 90 degrees apart from the rotation center as described above, but the center of the engagement hole 69 and the small diameter portion 51 or the large diameter portion 52 is not limited. It should be as far as possible from the straight line connecting Since the first operating portion 61 is engaged with the release member 4 and the release member 4 is rotatable relative to the outer ring 3, the switching member 5 described above is coupled with the outer ring 3 to make the first operation. It can be rotated relative to the operation unit 61.

As shown in FIG. 3, a mounting hole 65 is provided at the front end of the second operation portion 62. An operating lever R2 is provided at the front end of the arm frame R1 so as to be swingable by a shaft R3. A second operating portion is provided in a portion of the operating lever R2 below the shaft R3 by using a mounting hole 65. The front end of 62 is connected by a screw 68. Thus, when the lower end portion of the operation lever R2 is pushed backward, the release member 4 can be rotated counterclockwise in FIG. 7A via the second operation portion 62.

The aforementioned return engagement portion 53 protrudes from the small diameter portion 51 and the large diameter portion 52, and when the switching member 5 and the rotation restriction portion 35 are in the disengaged state (the restriction wall 56 or the restriction wall 57 and the rotation restriction portion). When the rotation of the switching member 5 is not restricted by the engagement with the engagement member 35), the switching member 5 can be rotated by the engagement with the contact portion 63. Further, when the switching member 5 is restricted in rotation by the engagement between the rotation restricting portion 35 and the restricting wall 56 or the restricting wall 57, the return engaging portion 53 bends the first operating portion 61 and comes into contact with the contact portion 53. 63 protrudes in such a size that it can get over the return engagement portion 53.

The operation of the armrest R using the one-way clutch 1 configured as described above will be described.
First, the operation of the one-way mechanism using the roller 71 and the pocket PK and the unlocking operation using the release piece 41 will be described with reference to FIG. As shown in FIG. 6A, when the inner ring 2 is to be rotated clockwise with respect to the outer ring 3, the space of the pocket PK rotates clockwise with respect to the outer ring 3. In terms of the relationship, the narrow part of the pocket PK moves away from the roller 71. Speaking on the basis of the roller 71, the roller 71 tends to move relatively to the wider side of the wedge-shaped space formed by the inner wall (the inclined surface 22 and the inner periphery 31) of the pocket PK (in practice, Since the roller 71 is urged by the spring 72, the roller 71 does not move relatively in the pocket PK). Therefore, the contact pressure between the inner wall of the pocket PK and the roller 71 does not increase, the roller 71 can roll counterclockwise in the figure, and the inner ring 2 can rotate relative to the outer ring 3. is there. The rotation in this direction is the rotation in the non-lock direction.

On the other hand, as shown in FIG. 6B, when the inner ring 2 is to be rotated counterclockwise with respect to the outer ring 3, the space of the pocket PK rotates counterclockwise with respect to the outer ring 3. In terms of the relationship with the roller 71, the narrow portion of the pocket PK moves in a direction approaching the roller 71. Speaking on the basis of the roller 71, the roller 71 tends to relatively move toward the narrower side of the wedge-shaped space formed by the inner wall (the inclined surface 22 and the inner periphery 31) of the pocket PK. Therefore, the roller 71 is held between the inner walls of the pocket PK, the contact pressure between the pocket PK and the roller 71 is increased, and the roller 71 cannot rotate with respect to the inner ring 2 and the outer ring 3. That is, the inner ring 2 and the outer ring 3 are locked to each other.

As shown in FIG. 6C, when the release piece 41 rotates counterclockwise with respect to the inner ring 2, the release piece 41 contacts the roller 71 and biases the roller 71 counterclockwise. Then, the roller 71 moves relatively to the wider side of the wedge-shaped space formed by the inner wall (inclined surface 22 and inner circumference 31) of the pocket PK, and the roller 71 is separated from the inner wall of the pocket PK. Therefore, in this state, the inner ring 2 can rotate freely with respect to the outer ring 3 even if it is rotated clockwise or counterclockwise. That is, the lock is released.

Thus, when the release piece 41 does not urge the roller 71 as shown in FIGS. 6A and 6B, depending on the rotation direction of the inner ring 2 and the outer ring 3, mutual rotation is impossible. So it can be said that it can be locked. On the other hand, in the case of FIG. 6 (c), the inner ring 2 can idle in any direction with respect to the outer ring 3, so that the lock is released.

Based on the principle of locking and unlocking as described above, the armrest R operates as follows.
As shown in FIG. 7A, when the arm frame R1 (armrest R) is at the lowest position, that is, when the armrest R is at the position A before the storing operation, the rotation restricting portion 35 of the outer ring 3 is The contact portion 63 of the operating rod 6 is close to the large-diameter portion 52 of the small-diameter portion 51 of the outer ring 3, and is close to the restricting wall 56 side between the restricting wall 56 and the restricting wall 57. It is located adjacent to 53. At this time, the release piece 41 is not in contact with the roller 71, and can be locked depending on the rotational direction, as described with reference to FIGS. 6 (a) and 6 (b). Since the outer ring 3 is fixed to the seat back S1 as described above, it does not move in FIG. 7 (a) and FIGS.

When the arm frame R1 is rotated upward from the state of FIG. 7A, the contact portion 63 engages with the step (here, the return engagement portion 53) between the large diameter portion 52 and the small diameter portion 51. Thus, the switching member 5 is pushed by the contact portion 63 and is rotated clockwise with respect to the outer ring 3. This rotation is possible until the regulating wall 57 comes into contact with the rotation regulating portion 35 as shown in FIG. In this rotation range (position A to position B), the release piece 41 is not in contact with the roller 71, so that it can be locked, and the arm frame R1 can rotate upward, Cannot rotate. Since the arm frame R1 rotates integrally with the inner ring 2, the inner ring 2 rotates relative to the outer ring 3 when the arm frame R1 rotates upward.

When the arm frame R1 is further rotated upward, the switching member 5 cannot rotate clockwise because the restriction wall 57 is in contact with the rotation restriction portion 35 of the outer ring 3, and is shown in FIG. As described above, the contact portion 63 gets over the return engagement portion 53 and contacts the large diameter portion 52. At this time, since the contact portion 63 is pulled in the lower right direction in FIG. 9, the engagement hole 69 is slightly pulled in the lower right direction, whereby the release member 4 is rotated counterclockwise relative to the inner ring 2. Rotate. At this time, the first operating portion 61 is slightly bent outward, but compared to the difference in radius between the small diameter portion 51 and the large diameter portion 52, the bending amount of the first operating portion 61 (with the engagement hole 69 stopped). (The amount of movement of the contact portion 63 radially outward when viewed) is slightly small, the amount of movement of the contact portion 63 due to the bending of the first operation portion 61 and the movement of the contact portion 63 due to the rotation of the release member 4. The sum of the amounts approximately corresponds to the difference in radius between the small diameter portion 51 and the large diameter portion 52.

When the release member 4 rotates counterclockwise relative to the inner ring 2, the release piece 41 urges the roller 71 counterclockwise as described with reference to FIG. It becomes a state. In other words, while the contact portion 63 is in contact with the large diameter portion 52, the inner ring 2 (arm frame R 1) can be rotated in any direction with respect to the outer ring 3.

When the arm frame R1 is further rotated upward, the switching member 5 cannot rotate clockwise because the restriction wall 57 is in contact with the rotation restricting portion 35 of the outer ring 3, and the contact portion 63 is large. The arm frame R 1 rotates with respect to the outer ring 3 while sliding on the diameter portion 52. This rotation is possible until the stopper R4 of the arm frame R1 contacts the stopper 38 of the outer ring 3, as shown in FIG. When the stopper R4 of the arm frame R1 comes into contact with the stopper 38 of the outer ring 3, the arm frame R1 is rotated to the position C. Between FIG. 9 and FIG. 10, the arm frame R1 can be arbitrarily rotated in any of the upper and lower directions.

When the arm frame R1 is rotated downward when the drawing operation is performed from the state of FIG. 10 toward the use position, the contact portion 63 slides counterclockwise on the large diameter portion 52, and the return engagement portion. The switching member 5 is rotated counterclockwise by engaging with 53. The switching member 5 rotates until the restricting wall 56 contacts the rotation restricting portion 35 as shown in FIG. In addition, when the friction between the contact part 63 and the large diameter part 52 is large and the friction between the switching member 5 and the outer ring 3 is small, the contact part 63 does not slide on the large diameter part 52, and the first 1 The operation portion 61 (abutment portion 63) and the switching member 5 are integrally rotated counterclockwise, and the abutment portion 63 of the large-diameter portion 52 is moved after the restriction wall 56 abuts against the rotation restriction portion 35. Although it may slide counterclockwise, the state shown in FIG. 11 is reached regardless of the order of operation. 10 to 11, since the contact portion 63 is in contact with the large diameter portion 52, the contact portion 63 is in an unlocked state, and the arm frame R1 can freely rotate in either the vertical direction. it can. 11 is a state in which the arm frame R1 is positioned slightly above the position A.

If the arm frame R1 is to be rotated downward from the state shown in FIG. 11, the switching wall 5 cannot be rotated counterclockwise because the regulating wall 56 is in contact with the rotation regulating portion 35. While the first operation portion 61 is bent, the contact portion 63 gets over the return engagement portion 53 and contacts the small diameter portion 51. Then, the state returns to the state shown in FIG. At this time, the position of the contact portion 63 that contacts the outer peripheral surface of the switching member 5 is switched from the large diameter portion 52 to the small diameter portion 51, and contrary to the change from the state of FIG. 8 to FIG. 2 pivots slightly clockwise. As a result, the release piece 41 does not urge the roller 71 and returns to the lockable state as described with reference to FIGS. 6 (a) and 6 (b).

As described above, according to the one-way clutch 1 of the present embodiment, it is possible to switch between the locked state and the unlocked state by a predetermined rotation operation of the armrest R (arm frame R1). The one-way clutch 1 does not have a structure in which a coil spring is wound around a shaft as in the prior art, but has a structure using a roller 71 disposed in a wedge-shaped pocket PK. Can do.

Further, as described above, the switching member 5 is rotatable with respect to both the inner ring 2 and the outer ring 3, and the rotation range is regulated by the rotation regulating portion 35, the regulating wall 56 and the regulating wall 57, Since the switching member 5 is provided with the return engagement portion 53, an operation of moving the arm frame R1 up and down as described above is possible.

In addition to the above operation, if the lower end portion of the operation lever R2 is pushed, the release member 4 can be rotated counterclockwise via the second operation portion 62, and the direction and contact of the arm frame R1 Regardless of the position of the part 63 that contacts the switching member 5, the lock can be released at any time by the user's intention. That is, usability can be improved.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented.
For example, as illustrated in FIG. 12, the protrusion 22 A may be provided on the inner wall of the pocket PK in proximity to the roller 71 on the side where the radial width of the pocket PK decreases. By doing so, the protrusion 22A and the roller 71 come into contact with each other during the forced relative rotation of the inner ring 2 and the outer ring 3 in the locking direction, and the contact pressure between the roller 71 and the inner wall of the pocket PK does not increase beyond that. And it can suppress that an excessive radial load is applied to the outer ring 3. The protrusion 22A may be provided on the inner circumference 31 of the outer ring 3.

In the embodiment, three roller holding portions 26 are provided. However, the number of roller holding portions 26 may be any number as long as it is one or more. However, in order to make the rotation of the inner ring 2 and the outer ring 3 smooth, it is desirable that the number of roller holding portions 26 be three or more and as many as possible.

In the above embodiment, the inner ring 2 is fixed to the arm frame R1, and the outer ring 3 is fixed to the seat back S1, but this is reversed, and the outer ring 3 is fixed to the arm frame R1 and the inner ring 2 is fixed to the seat back S1. It may be fixed. Of course, in this case, the direction of the wedge shape of the pocket PK may be appropriately changed.
Further, whether the inner ring 2 and the outer ring 3 can be locked when the release member 4 is rotated in any of the circumferential directions or whether the lock is released is appropriately changed according to the direction of the wedge shape of the pocket PK. be able to.

In the embodiment, the roller 71 is illustrated as an example of the movable piece. However, the movable piece may be a sphere, and the inner ring 2 and the outer ring 3 can be used as long as the sliding property is appropriately set. It may be a rectangular or wedge-shaped piece that does not roll.

The first operation member may not be engaged with the release member but may be fixed. Even in this case, if the abutting portion of the first operating member is set to a rigidity that can be bent and deformed to the extent that it can run from the small diameter portion to the large diameter portion, the release member is rotated to lock and unlock. Switching is possible. Similarly, the second operation member may be fixed to the release member.

In the embodiment described above, the inner periphery of the outer ring 3 is a cylindrical surface, and the outer periphery of the inner ring 2 (roller holding portion 26) is formed with a recess to form a pocket PK. However, the outer periphery of the inner ring 2 is a cylindrical surface, A pocket may be formed by providing a recess in the outer ring 3.

In the above embodiment, the rotation restricting portion 35 is provided on the outer ring 3, but may be provided on the inner ring 2.

In the above-described embodiment, the unlocking state is set when the abutting portion 63 contacts the large-diameter portion 52, and the unlocking state can be set when the abutting portion 63 contacts the small-diameter portion 51. Since the principle of switching this is utilized by moving it, it is possible to lock when the abutting portion 63 abuts on the large diameter portion 52, and when the abutting portion 63 abuts on the small diameter portion 51, You may comprise so that it may become. Further, the peripheral surface of the release member 4 with which the contact portion 63 contacts may be an inner peripheral surface instead of the outer peripheral surface. In this case, the return engagement portion 53 protrudes inward.

In the above embodiment, the switching member 5 is configured to be interlocked with the outer ring 3. However, the switching member 5 may be configured to be rotated in conjunction with the inner ring 2.

In the above embodiment, the return engagement portion 53 is provided at the connection portion between the small diameter portion 51 and the large diameter portion 52, but the return engagement portion 53 can also be provided in the middle of the large diameter portion 52 or the small diameter portion 51. .

In the embodiment, the spring 72 is illustrated as an example of the urging member, but the urging member may be a rubber damper.

In the above embodiment, the one-way clutch 1 is exemplified as the clutch, but the clutch may be a two-way clutch that can be engaged (locked) when the inner ring and the outer ring rotate in any direction. For example, the movable piece (roller 71), the pocket PK, the release piece 41, and the like may be provided symmetrically with the spring 72 interposed therebetween.

In the said embodiment, although the case where a one-way clutch was applied to support of an armrest was illustrated, the usage method of the one-way clutch of this invention is not restricted to this. For example, the one-way clutch of the present invention can be applied to a movable lumbar support, a seat height adjusting mechanism, a headrest that can be tilted by turning back and forth, and a movable ottoman (footrest). it can. Moreover, in the said embodiment, although the switching member 5 was comprised rotatably with respect to the outer ring | wheel 3, you may comprise it so that a switching member may not rotate relatively with respect to an outer ring | wheel (for example, integrally). In this case, part of the entire circumference of the outer peripheral surface of the switching member (entire range of 360 degrees) is the large-diameter portion 52, the rest is the small-diameter portion, and the return engagement portion 53 is not provided ( It ’s OK, but it ’s not necessary.) Then, the rotating member corresponding to the arm frame R1 rotates freely in the range where the contact portion 63 is in contact with the large diameter portion 52, and is unidirectional in the range where the contact portion 63 is in contact with the small diameter portion 51. Can only be rotated.

Claims

An armrest attached to the seat back,
An arm frame,
A clutch that rotatably supports the arm frame on the seat back;
The clutch is
An inner member fixed to one of the arm frame and the seat back;
An outer ring provided radially apart from the inner member and spaced from the inner member, and fixed to the other of the arm frame and the seat back;
A release member provided to be coaxial and rotatable with respect to both the inner member and the outer ring;
An armrest comprising: a release operation mechanism that operates the release member to release the locked state.
The inner member is an inner ring;
A movable piece housed in a pocket having a portion that is located between the inner ring and the outer ring and decreases in the radial direction as it goes to one side in the circumferential direction,
The release member has a release piece disposed adjacent to the one side in the circumferential direction with respect to the movable piece,
2. The armrest according to claim 1, wherein the release operation mechanism operates the release member to release a locked state in which the movable piece is clamped by an inner wall of the pocket.
The clutch is a one-way clutch,
The release operation mechanism is
A first operating member engaged or fixed to the release member;
A switching member that is coaxially rotatable with respect to both the inner ring and the outer ring and has a peripheral surface;
The first operating member is in contact with the peripheral surface of the switching member;
The switching member has a small-diameter portion as the peripheral surface, and a large-diameter portion larger in diameter than the small-diameter portion,
One of the inner ring or the outer ring has a rotation restricting portion that engages with the switching member and restricts relative rotation with respect to the switching member within a predetermined angle range,
The peripheral surface is provided with a return engagement portion protruding in the radial direction,
When the first operating member comes into contact with one of the small-diameter portion and the large-diameter portion, the release member is rotated to the one in the circumferential direction, and the movable piece is clamped by the inner wall of the pocket and locked. And the first operating member abuts against the other of the small-diameter portion and the large-diameter portion so that the release member is rotated in the other circumferential direction to unlock the movable piece. The armrest according to claim 2, wherein the armrest is configured as described above.
The inner ring includes a first metal part constituting a part of the inner wall of the pocket, and a first resin part,
The first metal part and the first resin part are circumferentially engaged with each other by engagement of the unevenness formed on the inner periphery of the first metal part and the unevenness formed on the outer periphery of the first resin part. The armrest according to claim 2 or 3, wherein the armrest is combined so as not to be displaced in the direction.
An urging member arranged to urge the movable piece toward one side in the circumferential direction;
The inner ring includes a first metal part constituting a part of the inner wall of the pocket, and a first resin part,
The first metal part and the first resin part are circumferentially engaged with each other by engagement of the unevenness formed on the inner periphery of the first metal part and the unevenness formed on the outer periphery of the first resin part. Combined so as not to shift in the direction,
The first metal part has a biasing member holding recess recessed toward the center for holding the biasing member on the outer periphery, and the first metal part is radially inward of the biasing member holding recess. 4. The armrest according to claim 2, wherein a convex shape that is convex toward the center among the concaves and convexes of the one metal part is located. 5.
The outer ring includes a second metal part constituting a part of the inner wall of the pocket, and a second resin part,
The second metal part and the second resin part are circumferentially engaged with each other by engagement between the unevenness formed on the outer periphery of the second metal part and the unevenness formed on the inner periphery of the second resin part. The armrest according to claim 2 or 3, wherein the armrest is combined so as not to be displaced in the direction.
When the clutch is in a locked state, a convex shape that is convex outward in the radial direction among the concaves and convexes of the second metal part is located on the radially outer side of the movable piece. The armrest according to 6.
The release member has an extending portion extending radially outward,
3. The first operation member is disposed in a range that is engaged with the release member in the extending portion and is radially outside the outer ring and overlaps the outer ring in the axial direction. Or the armrest of Claim 3.
A protrusion is provided on the inner wall of the pocket on the one side in the circumferential direction with respect to the movable piece, so that the protrusion and the movable piece come into contact with each other when the inner ring and the outer ring are forced to rotate relative to each other in the locking direction. The armrest according to claim 2, wherein the armrest is configured as follows.
The release operation mechanism includes a second operation member that is engaged with or fixed to the release member and extends toward a tip of the arm frame,
4. The lock of the movable piece can be released by rotating the release member to the other in the circumferential direction by operating the second operation member. 5. Armrest.
The release operation mechanism includes a second operation member that is engaged with or fixed to the release member and extends toward a tip of the arm frame, and the release member is circumferentially operated by the operation of the second operation member. Is configured to be able to unlock the movable piece by rotating to the other of
The first operation member is provided in an arc shape around the rotation axis of the arm frame,
The second operating member is provided along the longitudinal direction of the arm frame,
The armrest according to claim 3, wherein the first operation member and the second operation member are disposed so as not to overlap each other when viewed in the axial direction.
The armrest according to claim 3, wherein the small-diameter portion and the large-diameter portion are formed as a flange formed by extending a peripheral edge of the switching member in the axial direction.
The armrest according to claim 12, wherein the flange forming the small diameter portion and the flange forming the large diameter portion are continuous.
The armrest according to claim 3, wherein the return engaging portion is formed integrally with the switching member.
The armrest according to claim 8, wherein the extending portion is formed integrally with the release member.
A first attached member is fixed to the inner ring, and a second attached member is fixed to the outer ring;
One of the first attached member and the second attached member projects to the one-way clutch side and is fixed to the other of the first attached member and the second attached member. A stopper that engages and restricts the one rotation range;
The said stopper is provided in the range which overlaps with the said extension part in the axial direction, and is provided in the range which does not overlap with the said extension part seeing from an axial direction. Armrest.