JP2013224678A - Clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly safe clutch device capable of reliably maintaining a locked state even when an excessive load is applied to a second member.SOLUTION: A clutch device includes a lock drum 1 on the side of a first member, an output shaft plate 6 on the side of a second member, a lock spring 3 internally fitted to the lock drum 1, and an adjusting drum 2 arranged inside the lock spring 3. The lock spring 3 has an outer diameter slightly larger than the inner diameter of the lock drum 1 in a free state, and includes lock spring step portions 3c each consisting of a lock spring curve portion 3d and a lock spring bottom portion 3e. Lock spring pulling-side contact points 3a and lock spring pushing-side contact points 3b are formed respectively on the side of the lock spring curved parts 3d on which the diameter of the lock spring 3 is contracted and the side on which the diameter is expanded. The adjusting drum 2 is provided with a lock spring operation piece 8 for pressing the lock spring pulling-side contact points 3a, and the output shaft plate 6 is provided with a lock spring pressing piece 7 for pressing the lock spring pushing-side contact points 3b.

Description

  The present invention relates to a clutch device that is interposed between a first member and a second member and switches between an unlocked state in which the second member can be rotated with respect to the first member and a locked state in which the second member cannot be rotated.

  As a seat lifter mechanism that adjusts the height of a vehicle seat by operating an operation lever, a lock spring having an outer diameter slightly larger than the inner diameter of the lock drum is internally fitted in the lock drum. (For example, Patent Documents 1 to 3). In these mechanisms, when the operation lever (for example, reference numeral 90 in FIG. 7 of Patent Document 2) is not operated, the outer peripheral surface of the lock spring (reference numeral 32 in the same figure) is the lock drum (reference numeral 20 in the same figure). If the operation lever is operated while maintaining the locked state in which the lock spring cannot be rotated with respect to the lock drum while being in close contact with the inner peripheral surface, the end of the lock spring (reference numeral 37 in the figure) is pulled. When pressed in the direction (direction in which the lock spring is reduced in diameter), the outer peripheral surface of the lock spring is separated from the inner peripheral surface of the lock drum, and an unlocked state in which the lock spring can be rotated with respect to the lock drum appears. ing.

  Although the above mechanism can adjust the height of the vehicle seat steplessly with a simple operation, it has the following drawbacks. In other words, these mechanisms have a structure in which the load applied to the vehicle seat in the locked state is supported by the end portion of the lock spring. For this reason, if an excessive load is applied to the vehicle seat due to an impact such as an accident, the end of the lock spring is damaged and the locked state cannot be maintained, and the vehicle seat moves unexpectedly, causing damage to the human body. There was a risk of enlargement. Further, in the ottoman device for a vehicle, in the mechanism for switching between the storage state in which the ottoman body is stored under the seat and the use state in which the ottoman body is pulled forward from the seat, the lock drum has a slightly smaller outer diameter than the lock drum. There is known one in which a lock spring having a small inner diameter is externally fitted (for example, Patent Document 4). However, this type of vehicle ottoman device has the same problem. Even if an excessive load is applied to the vehicle seat due to an accident or the like, it is only necessary to have a mechanism that can reliably maintain the locked state. However, no mechanism has been found that has taken such measures at a sufficient level.

Japanese Patent Laid-Open No. 2002-195312 JP 2002-195323 A JP 2009-168094 A JP 2008-013132 A

  The present invention solves the above-described problem, and is a lock that can rotate a second member (such as an output shaft for raising and lowering a vehicle seat) relative to a first member (such as a member that fixes a lock drum). A clutch device that switches between a released state and a non-rotatable locked state, and is a highly safe clutch device that can reliably maintain the locked state even when an excessive load is applied to the second member side Is to provide. It is also an object of the present invention to provide such a highly safe clutch device with a structure as simple as possible.

The above issues
A clutch device that is interposed between the first member and the second member, and switches between an unlocked state in which the second member can be rotated with respect to the first member and a locked state in which the second member cannot be rotated,
A lock drum fixed to the first member side;
An output shaft plate fixed to the second member side;
A lock spring fitted in the lock drum and having an outer diameter slightly larger than the inner diameter of the lock drum in a free state;
An adjustment drum arranged inside the lock spring;
With
A lock spring step portion formed of a lock spring bent portion bent toward the center side of the lock spring and a lock spring bottom portion bent from the lock spring bent portion in the winding forward direction of the lock spring is formed on the lock spring,
A lock spring tension side contact is provided on the side where the diameter of the lock spring is reduced.
A lock spring pressing side contact is provided on the side of the lock spring bent portion where the diameter of the lock spring is expanded,
The adjustment drum is provided with a lock spring operation piece for pressing the lock spring tension side contact,
This is solved by providing a clutch device in which a lock spring pressing piece for pressing the lock spring pressing side contact is provided on the output shaft plate. The specific operation of the clutch device of the present invention will be described later.

  Like the clutch device of the present invention, the lock spring pressing piece is pressed against the lock spring pressing side contact of the lock spring bent portion in the lock spring step portion, so that an excessive load is applied to the second member side, and the load is increased. When locked onto the lock spring pressing piece through the output shaft plate, the lock spring pressing piece is guided to the inside of the lock spring (the gap between the inner peripheral surface of the lock spring and the outer peripheral surface of the lock spring step) by the lock spring bottom. To increase safety. Moreover, since such an effect can be acquired by forming a lock spring step part in a lock spring, it is also easy to suppress the cost and weight of a clutch apparatus.

  In the clutch device of the present invention, the lock spring bottom may be in a free state, but is preferably as follows. That is, it is preferable to further include a lock spring bottom receiving drum that is fitted in the lock spring and receives the lock spring bottom at the outer peripheral surface thereof. Thereby, even when an excessive load is applied to the second member side, it is possible to prevent the lock spring bottom portion from rising and to maintain the position relative to the lock spring pressing piece. Therefore, the lock spring pressing piece guided in the gap between the inner peripheral surface of the lock drum and the outer peripheral surface of the lock spring intentionally expresses a state in which the lock spring pressing piece is crushed and meshed in the gap, and the locked state can be maintained more reliably. It becomes possible.

  Further, in the clutch device of the present invention, the place where the lock spring step portion is provided is not particularly limited, and may be either an end portion or a midway portion of the lock spring. You may form a lock spring step part in the intermediate part (For example, the 4th volume in case a lock spring is 7 volumes) of a lock spring. Even if the lock spring step portion is provided at any of these locations, the above-described effects can be obtained.

Furthermore, in the clutch device of the present invention,
An adjustment spring fitted in the adjustment drum and having an outer diameter slightly larger than the inner diameter of the adjustment drum in a free state;
An operation drum arranged inside the adjustment spring;
A return drum fitted in the adjustment spring;
A return spring for returning the displaced return drum to the initial position;
Further comprising
The adjustment spring is formed with an adjustment spring step portion formed of an adjustment spring bent portion bent toward the center side of the adjustment spring, and an adjustment spring bottom portion bent from the adjustment spring bent portion in the winding forward direction of the adjustment spring.
An adjustment spring tension side contact is provided on the adjustment spring curved portion on the side where the diameter of the adjustment spring is reduced,
An adjustment spring pressing side contact is provided on the side of the adjustment spring curved portion where the adjustment spring is expanded,
The return drum is provided with an adjustment spring operation piece for pressing the adjustment spring tension side contact,
The operation drum is provided with an adjustment spring pressing piece for pressing the adjustment spring pressing side contact,
It is preferable that the position of the second member relative to the first member can be adjusted by intermittent feeding.

  This configuration is preferably employed in a vehicle seat height adjusting device or the like. The reason why the adjustment spring step portion including the adjustment spring curved portion and the adjustment spring bottom portion is formed on the adjustment spring is the same as that of the lock spring. It is the same as that of the lock spring that the adjustment spring step portion may be provided at either the end portion or the midway portion (including the intermediate portion) of the adjustment spring. Further, the adjustment spring bottom receiving drum that is fitted in the adjustment spring and receives the adjustment spring bottom at the outer peripheral surface thereof is preferably the same as the lock spring.

  Furthermore, in the clutch device of the present invention, the portion of the outer peripheral surface of the lock spring that contacts the inner peripheral surface of the lock drum and / or the inner peripheral surface of the adjustment drum on the outer peripheral surface of the adjustment spring (when the lock spring bottom receiving drum is provided) It is also preferable to provide a plurality of depressions in a portion that contacts the lock spring bottom receiving drum). This recess increases the frictional force of the lock spring against the inner peripheral surface of the lock drum and the frictional force of the adjustment spring against the inner peripheral surface of the adjustment drum, thereby increasing the locking force. Since this dent is a small one having a width of about 0.2 to 0.5 mm and a depth of about 0.05 to 0.2 mm, it may be plastically processed using a mold or a rolling die. From these, the strength of the lock spring and the strength of the adjusting spring are not affected. (Fig. 4)

  Further, when the clutch device of the present invention is used in a ottoman device for a link mechanism in which the first member and the second member are part of the constituent members of the link mechanism and the adjustment drum is a clutch operation member, the locking force is increased. A high and safe ottoman device can be provided.

  As described above, according to the present invention, it is possible to provide a highly safe clutch device that can reliably maintain a locked state even when an excessive load is applied to the second member side. It is also possible to provide such a highly safe clutch device with a simple structure.

It is sectional drawing which showed the state which cut | disconnected the clutch apparatus of 1st embodiment by the plane perpendicular | vertical to an output shaft. It is sectional drawing which showed the state which cut | disconnected the clutch apparatus of the 1st embodiment in the AA surface in FIG. It is the perspective view which showed the state which decomposed | disassembled the clutch apparatus of the 2nd embodiment into each component. It is sectional drawing which showed the state which cut | disconnected the periphery of the lock spring pressing piece in the clutch apparatus of 2nd embodiment with the plane perpendicular | vertical to an output shaft. FIG. 5 is a cross-sectional view showing an example of a state after an excessive load is applied to the second member side from the state shown in FIG. 4 in the clutch device of the second embodiment. It is the perspective view which showed the state which decomposed | disassembled the clutch apparatus of the 3rd embodiment into each component. It is sectional drawing which showed the state which cut | disconnected the intermittent feed mechanism in the clutch apparatus of 3rd embodiment in the plane perpendicular | vertical to an output shaft. It is sectional drawing which showed the state which cut | disconnected the clutch apparatus of 4th embodiment by the plane perpendicular | vertical to an output shaft. It is sectional drawing which showed the state which cut | disconnected the clutch apparatus of the 4th embodiment in the BB surface in FIG. It is sectional drawing which showed the state which cut | disconnected the ottoman apparatus for vehicles incorporating the clutch apparatus of this invention by the plane perpendicular | vertical to the output shaft.

  A preferred embodiment of the clutch device of this embodiment will be described more specifically with reference to the drawings. In the following, four embodiments from the first embodiment to the fourth embodiment will be described as examples. However, the technical scope of the present invention is not limited to these, and the gist of the present invention is impaired. Changes can be made as long as there is no range.

[First embodiment]
First, the clutch device of the first embodiment will be described. FIG. 1 is a cross-sectional view showing a state in which the clutch device of the first embodiment is cut along a plane perpendicular to the output shaft 5. 2 is a cross-sectional view showing a state in which the clutch device of the first embodiment is cut along the AA plane in FIG. 1. The clutch device according to the first embodiment is interposed between the first member and the second member, and switches between an unlocked state in which the second member can be rotated with respect to the first member and a locked state in which the second member cannot be rotated. It has become. As shown in FIG. 1, the clutch device of the first embodiment includes a lock drum 1, an output shaft plate 6, an output shaft 5, a lock spring 3, and an adjustment drum 2. The lock drum 1 is fixed to a first member (not shown), and the output shaft plate 6 is fixed to a second member (not shown) via an output shaft 5 fixed thereto. The lock spring 3 has an outer diameter that is several percent larger than the inner diameter of the lock drum 1 in a free state, and is forcibly fitted into the lock drum 1. Although the first member and the second member differ depending on the use of the clutch device, for example, when the clutch device is incorporated in an elevating mechanism (lifter device) that adjusts the height of the vehicle seat, the first member is: The frame is a seat bottom in a vehicle seat, and the second member is an input side member of the lifting mechanism.

  As shown in FIG. 1, the lock spring 3 includes a lock spring stage 3d bent toward the center thereof, and a lock spring stage 3d bent from the lock spring curve 3d in the winding forward direction of the lock spring 3. Part 3c is formed. In the clutch device according to the first embodiment, the lock spring step portion 3 c is provided at both ends of the lock spring 3. The side of the lock spring bent portion 3d on which the diameter of the lock spring 3 is reduced is a lock spring tension side contact 3a, and the side of the lock spring bent portion 3d on which the diameter of the lock spring 3 is expanded is a lock spring pressing side contact 3b. The adjustment drum 2 is provided with a lock spring operating piece 8 for pressing the lock spring tension side contact 3a. The output shaft plate 6 is provided with a lock spring pressing piece 7 for pressing the lock spring pressing side contact 3b.

  In the clutch device according to the first embodiment, when the adjusting drum 2 is rotated with respect to the lock drum 1 by operating an operation lever (not shown), the lock spring operating piece 8 provided integrally therewith is locked to the lock spring. The lock spring 3d is pressed by the side contact 3a to reduce the diameter of the lock spring 3, so that the lock spring 3 is rotatable with respect to the lock drum 1 (lock spring movable state). That is, an unlocked state in which the second member (the member with the output shaft 5 fixed) can be rotated with respect to the first member (the member with the lock drum 1 fixed) is developed.

  On the other hand, when the operation of the operation lever is stopped, the lock spring 3 expands to its original state and comes into close contact with the inner peripheral surface of the lock drum 1 so that it cannot rotate with respect to the lock drum 1 (lock spring fixed state). . That is, a locked state in which the second member cannot be rotated with respect to the first member appears. In this lock spring fixed state, even if the load is applied to the second member and the output shaft plate 6 tries to rotate with respect to the lock drum 1, the lock spring pressing piece 7 presses the lock spring 3 with the lock spring pressing side contact 3b. Since the lock spring 3 is further in close contact with the inner peripheral surface of the lock drum 1, a large locking force can be obtained. Even when an excessive load is applied to the second member side, the lock spring pressing piece 7 is moved to the inside of the lock spring 3 (the inner peripheral surface of the lock spring 3 and the outer peripheral surface of the lock spring step portion 3c by the lock spring bottom 3e. It can be guided to the gap) to keep the locked state firmly.

[Second Embodiment]
Next, the clutch device of the second embodiment will be described. FIG. 3 is a perspective view showing a state in which the clutch device of the second embodiment is disassembled into parts. FIG. 4 is a cross-sectional view showing a state where the periphery of the lock spring pressing piece 7 in the clutch device of the second embodiment is cut by a plane perpendicular to the output shaft 5. FIG. 5 is a cross-sectional view showing an example of a state after an excessive load is applied to the second member side from the state shown in FIG. 4 in the clutch device of the second embodiment.

  As shown in FIGS. 3 to 5, the clutch device according to the second embodiment includes a lock spring bottom receiving drum 17 fitted inside the lock spring 3. The lock spring bottom receiving drum 17 is in the relationship between the inner side and the outer side of the same member with respect to the adjustment drum 2. The lock spring bottom receiving drum 17 receives the lock spring bottom 3e on its outer peripheral surface, so that the lock spring bottom 3e is not deformed even when a large load is applied to the lock spring bent portion 3d from the lock spring pressing piece 7. Thus, the shape of the lock spring step portion 3c is maintained, and the lock spring pressing piece 7 is reliably guided by the gap between the inner peripheral surface of the lock spring 3 and the outer peripheral surface of the lock spring step portion 3c.

  As shown in FIG. 5, the lock spring pressing piece 7 guided to the gap is crushed and meshed in the gap. Note that this state of deformation is an example for explanation, and actually a form that is crushed and bitten in a different form is selected.

[Third embodiment]
Next, the clutch device of the third embodiment will be described. FIG. 6 is a perspective view showing a state in which the clutch device of the third embodiment is disassembled into parts. FIG. 7 is a cross-sectional view showing a state in which the intermittent feed mechanism in the clutch device of the third embodiment is cut along a plane perpendicular to the output shaft 5. As shown in FIG. 3, the clutch device according to the second embodiment described above is a lock mechanism including a lock drum 1, an adjustment drum 2, a lock spring 3, an output shaft 5, and an output shaft plate 6. However, as shown in FIG. 6, the clutch device of the third embodiment has an adjustment spring 10, an operation drum 11, a return drum 12, a return spring 13, and an adjustment spring bottom in addition to the lock mechanism. An intermittent feeding mechanism constituted by the receiving drum 18 is provided. An operation plate 14 is provided on the outer side of the return spring 13. The operation plate 14 is fixed to operation means such as an operation lever (not shown).

  The adjustment spring 10 has an outer diameter that is several percent larger than the inner diameter of the adjustment drum 2 in a free state, and is forcibly fitted into the adjustment drum 1 as shown in FIG. The operation drum 11 is disposed inside the adjustment spring 10, and one end thereof is integrally fixed to the operation plate 14. The return drum 12 has a small-diameter portion on one end side fitted into the adjustment spring 10 through an opening provided in the lock drum 1, and a large-diameter portion on the other end side is disposed outside the lock drum 1. The return drum 12 is divided into a first return drum 12a and a second return drum 12b. The return spring 13 is held by the enlarged diameter portion of the return drum 12. A return spring contact piece 4 provided on the lock drum 1 is disposed in a gap between a pair of bent portions provided at both ends of the return spring 13. The return spring 13 is for returning the return drum 12 displaced from the initial position to the initial position. The adjustment spring bottom receiving drum 18 is integrally provided coaxially with the output shaft 5.

  As shown in FIGS. 6 and 7, the adjustment spring 10 includes an adjustment spring bent portion 10d bent toward the center thereof, and an adjustment spring bottom portion bent in the winding forward direction of the adjustment spring 10 from the adjustment spring bent portion 10d. An adjustment spring step portion 10c is formed. In the clutch device according to the third embodiment, the adjustment spring step portions 3c are provided at both ends of the adjustment spring 10. However, like the lock spring step portion 3c in the clutch device according to the fourth embodiment, which will be described later, the adjustment spring step portion 3c is halfway. You may provide in a part. The side of the adjustment spring curved portion 10d that reduces the diameter of the adjustment spring 10 is an adjustment spring tension side contact 10a, and the side of the adjustment spring curved portion 10d that expands the diameter of the adjustment spring 10 is the adjustment spring pressing side contact 10b. It has become. The return drum 12 is provided with an adjustment spring operation piece 16 for pressing the adjustment spring tension side contact 10. The operation drum 11 is provided with an adjustment spring pressing piece 15 for pressing the adjustment spring pressing side contact 10d.

  The clutch device of the third embodiment can intermittently adjust and feed the position of the second member with respect to the first member as follows by adopting the configuration of FIG. Here, for convenience of explanation, it is assumed that the operation lever is fixed to the operation plate 14. First, when the operation plate 14 and the operation drum 11 are rotated by operating the operation lever from the initial position, the adjustment spring pressing piece 15 presses the adjustment spring pressing side contact 10 b in the adjustment spring 10. For this reason, the adjustment spring 10 is expanded in diameter and its outer peripheral surface is in close contact with the inner peripheral surface of the adjustment drum 2, so that the adjustment spring 10 cannot be rotated with respect to the adjustment drum 2 (the adjustment spring 10 and the adjustment drum 2 are integrated). State). Thereby, the operation drum 11 and the adjustment drum 2 rotate integrally.

  On the other hand, when the operation lever is returned from the displacement position to the initial position, the return drum 12 is rotated by the return spring 13 prior to the operation lever, and the adjustment spring operation piece 12c presses the adjustment spring tension side contact 10a of the adjustment spring 10. To do. For this reason, the adjustment spring 10 is in a movable state in which the diameter of the adjustment spring is reduced and the adjustment spring 10 is rotatable relative to the adjustment drum 2. In the adjustment spring movable state, the operation drum 11 rotates, but the adjustment drum 2 does not rotate. That is, in the clutch device according to the third embodiment, when the operation lever is operated from the initial position to the displacement position, the output shaft 5 rotates and the second member operates to move the operation lever from the displacement position to the initial position. When returning, the output shaft 5 does not rotate and the second member does not operate. For this reason, the position of the second member relative to the first member is intermittently rotated. As described above, since the clutch device of the third embodiment includes the intermittent feed mechanism, for example, a significant angle adjustment can be performed regardless of a limited operation angle, such as a vehicle seat height adjustment device. In this case, it can be preferably employed. In the clutch device of the third embodiment, since the same configuration as that of the clutch device of the other embodiments can be adopted for the configurations other than those described here, the detailed description thereof is omitted.

[Fourth embodiment]
Next, a clutch device according to a fourth embodiment will be described. FIG. 8 is a cross-sectional view showing a state in which the clutch device of the fourth embodiment is cut along a plane perpendicular to the output shaft 5. FIG. 9 is a cross-sectional view showing a state in which the clutch device of the fourth embodiment is cut along the BB plane in FIG. 8. In the clutch device from the first embodiment to the third embodiment, the lock spring step 3c is provided at both ends of the lock spring 3. However, in the clutch device of the fourth embodiment, as shown in FIG. A lock spring step 3c is provided in the middle. Specifically, a pair of lock spring bent portions 3d provided near the middle portion of the lock spring 3 and a lock spring bottom portion 3e connecting the lock spring step portions 3c constitute a lock spring pressing piece in a gap between the pair of lock spring bent portions 3d. 7 is inserted. For this reason, the lock spring bending portion 3d constituting the lock spring step portion 3c serves as a lock spring pressing side contact 3b (lock spring coupling fixed contact).

  On the other hand, the lock spring tension side contact 3 a is always provided at the end of the lock spring 3. In the clutch device of the fourth embodiment, the lock spring tension side contact 3a is provided on the lock spring bent portion 3d provided separately at the end of the lock spring 3. In this case, the lock spring bent portion 3d at the end of the lock spring 3 does not need to be provided with the lock spring bottom portion 3e to be the lock spring step portion 3c. When an excessive load is applied to the second member side, the load is applied to the lock spring pushing side contact 3b, while the load is not applied to the lock spring tension side contact 3a. Because there is no. The same applies to the adjustment spring 10 described in the clutch device of the third embodiment. In the clutch device of the fourth embodiment, since the same configuration as that of the clutch device of the other embodiments can be adopted for the configurations other than those described here, the detailed description thereof is omitted.

[Application example]
Next, application examples of the present invention will be described. FIG. 10 is a cross-sectional view showing a state where the ottoman device for a vehicle incorporating the clutch device of the present invention is cut along a plane perpendicular to the output shaft 5. The ottoman device for a vehicle shown in FIG. 10 includes the clutch device 100 of the present invention, a link mechanism 200, and an ottoman body 300. The clutch device 100 can be used in any of the above-described embodiments. However, in the ottoman device for a vehicle, an intermittent feed mechanism is not particularly required, and here, the clutch device 100 without the intermittent feed mechanism is used. Is used. In addition, a portion corresponding to the adjustment drum 2 is divided into a first clutch operation member 59a having a first lock spring operation piece 58a provided at the front end and a second clutch operation member having a second lock spring operation piece 58b provided at the front end. 59b. The link mechanism 200 is for supporting the ottoman main body 300 in a state where the ottoman main body 300 can be pulled forward from the lower side of the seat. Among the members constituting the link mechanism 200, the lock drum 1 is fixed to the first member 210, and the output shaft 5 is fixed to the second member 220.

  A specific operation of the ottoman device for a vehicle shown in FIG. 10 will be described. When the base lever of the first clutch operating member 59a and the base end of the second clutch operating member 59b are rotated in directions away from each other by operating an operation lever (not shown) or the like, the first lock spring operating piece 58a. And the second lock spring operation piece 58b are rotated in the direction approaching each other and press the lock spring tension side contacts 3a provided at both ends of the lock spring 3, respectively. For this reason, the lock spring 3 is reduced in diameter to be unlocked. In this state, the ottoman body 300 is pulled forward or stored under the seat. When the operation of the operation lever is stopped, the lock spring 3 expands in diameter and a locked state is manifested, etc., as in the clutch device of the first embodiment described above.

  As described above, in the ottoman device for a vehicle shown in FIG. 10, the portion corresponding to the adjustment drum 2 is configured by a plurality of clutch operation members (first clutch operation member 59a and second clutch operation member 59b). The clutch operating member can be one member.

[Usage]
The application of the clutch device of the present invention described above is not limited, and can be employed in various applications. Especially, it can employ | adopt suitably for the raising / lowering mechanism in the lifter apparatus of a vehicle seat, the angle adjustment mechanism in the reclining apparatus of a vehicle seat, the lock mechanism in a ottoman apparatus for vehicles, etc. Any of the clutch devices used in these devices may cause an excessive load on the second member side due to an accident or the like. For this reason, by using the clutch device of the present invention, there is an advantage that the safety of the occupant can be improved.

DESCRIPTION OF SYMBOLS 1 Lock drum 2 Adjustment drum 3 Lock spring 3a Lock spring tension side contact 3b Lock spring pushing side contact 3c Lock spring step part 3d Lock spring curved part 3e Lock spring bottom part 4 Return spring contact piece 5 Output shaft 6 Output shaft plate 7 Lock spring pressing piece 8 Lock spring operation Piece 10 Adjustment spring 10a Adjustment spring tension side contact 10b Adjustment spring pushing side contact 10c Adjustment spring step portion 10d Adjustment spring curved portion 10e Adjustment spring bottom 11 Operation drum 12 Return drum 12a First return drum 12c Second return drum 13 Return spring 14 operation plate 15 adjustment spring pressing piece 16 adjustment spring operation piece 17 lock spring bottom receiving drum 18 adjustment spring bottom receiving drum 20 operation lever 21 depression 53 lock spring 58a first lock spring operation piece 58b second lock spring operation piece 9a first clutch operating member 59b second clutch operating member 100 clutch device 200 link mechanism 210 first member 220 second member 300 ottoman body

Claims (7)

A clutch device that is interposed between the first member and the second member, and switches between an unlocked state in which the second member can be rotated with respect to the first member and a locked state in which the second member cannot be rotated,
A lock drum fixed to the first member side;
An output shaft plate fixed to the second member side;
A lock spring fitted in the lock drum and having an outer diameter slightly larger than the inner diameter of the lock drum in a free state;
An adjustment drum arranged inside the lock spring;
With
A lock spring step portion formed of a lock spring bent portion bent toward the center side of the lock spring and a lock spring bottom portion bent from the lock spring bent portion in the winding forward direction of the lock spring is formed on the lock spring,
A lock spring tension side contact is provided on the side where the diameter of the lock spring is reduced.
A lock spring pressing side contact is provided on the side of the lock spring bent portion where the diameter of the lock spring is expanded,
The adjustment drum is provided with a lock spring operation piece for pressing the lock spring tension side contact,
A clutch device characterized in that a lock spring pressing piece for pressing a lock spring pressing side contact is provided on the output shaft plate.   The clutch device according to claim 1, further comprising a lock spring bottom receiving drum that is fitted in the lock spring and receives the lock spring bottom on an outer peripheral surface thereof.   The clutch device according to claim 1, wherein the lock spring step portion is formed at an intermediate portion of the lock spring. An adjustment spring fitted in the adjustment drum and having an outer diameter slightly larger than the inner diameter of the adjustment drum in a free state;
An operation drum arranged inside the adjustment spring;
A return drum fitted in the adjustment spring;
A return spring for returning the displaced return drum to the initial position;
Further comprising
The adjustment spring is formed with an adjustment spring step portion formed of an adjustment spring bent portion bent toward the center side of the adjustment spring, and an adjustment spring bottom portion bent from the adjustment spring bent portion in the winding forward direction of the adjustment spring.
An adjustment spring tension side contact is provided on the adjustment spring curved portion on the side where the diameter of the adjustment spring is reduced,
An adjustment spring pressing side contact is provided on the side of the adjustment spring curved portion where the adjustment spring is expanded,
The return drum is provided with an adjustment spring operation piece for pressing the adjustment spring tension side contact,
The operation drum is provided with an adjustment spring pressing piece for pressing the adjustment spring pressing side contact,
The clutch device according to claim 1, wherein the position of the second member relative to the first member can be adjusted by intermittent feeding.   The clutch device according to claim 4, further comprising an adjustment spring bottom receiving drum that is fitted in the adjustment spring and receives the adjustment spring bottom at an outer peripheral surface thereof.   6. The device according to claim 1, wherein a plurality of depressions are provided in a portion of the outer peripheral surface of the lock spring that contacts the inner peripheral surface of the lock drum and / or a portion of the outer peripheral surface of the adjustment spring that contacts the inner peripheral surface of the adjustment drum. The clutch device as described. The first member and the second member are part of the structural members of the link mechanism,
The clutch device according to any one of claims 1 to 6, which is used for a vehicle ottoman device of a link mechanism, wherein the adjustment drum is a clutch operation member.

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