JP2007039913A - Rotating operation support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating operation support device capable of easily changing the rotating speed of a rotating body. <P>SOLUTION: This rotating operation support device comprises a rotating damper 40 damping the energizing force of a coiled spring energizing the rotation of the rotating body in the opening direction, a first member 10 supporting the rotating damper, and a second member 20 rotatably connected to the first member. The coiled spring is so installed that a connection part between the first member and the second member is inserted into a coil part, both ends thereof are locked to the first member and the second member, and the first member or the second member is rotated according to the rotation of the rotating body in the closing direction to wind and tighten the coil part. The first member comprises a space 11 in which the rotating damper is stored and an elastic part disposed around the rotating damper and having a claw part 15 at its end. The rotating member is prevented from falling off the first member by the claw part, and releasable from the first member by deforming the elastic part to cancel a fall prevention function for the claw part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotational motion assisting device that assists the rotational motion of a rotating body that rotates between a fully open position and a fully closed position.

  Conventionally, when a rotating body such as a lid or a door rotates in the opening direction, a spring that urges the rotating operation, a rotating damper that attenuates the urging force of the spring and decelerates the rotational speed of the rotating body, The engaging portion and the engaged portion are engaged by applying an external force in the closing direction to the rotating body when the rotating body reaches the fully closed position, and thereafter A rotation assisting device is known that includes a latch mechanism that can release the engagement by reapplying an external force in the closing direction to the rotating body.

  For example, Japanese Patent Application Laid-Open No. 1-15548 discloses a spring and a latch mechanism provided inside the rotary damper in order to improve a problem when the spring, the rotary damper, and the latch mechanism are separately and independently provided. Thus, a rotational motion assisting device in which a spring, a rotational damper, and a latch mechanism are integrated is disclosed.

  However, the conventional rotational motion assisting device has a problem that the characteristics of the spring and the rotational damper that determine the rotational speed in the opening direction of the rotating body cannot be easily changed. That is, in the above-described rotational motion assisting device disclosed in Japanese Patent Laid-Open No. 1-15548, for example, when it is desired to increase the braking force of the rotating damper that attenuates the biasing force of the spring, only the rotating damper is removed, Since it cannot be replaced with another rotating damper, replace the entire device with another device with different characteristics, or disassemble the device and reinject high-viscosity oil, or replace components of the rotating damper It is necessary to do. In this case, replacing the entire device is costly, and disassembling and reassembling the device requires the same or more effort and time as the assembly from the beginning. It will take.

JP-A-1-15548

  The present invention has been made in view of the above circumstances, and in a rotational operation assisting device including at least a spring and a rotational damper, the rotational damper can be easily replaced with another rotational damper having different characteristics. It is an object of the present invention to provide a rotation operation assisting device that can easily change the rotation speed of a rotating body.

In order to solve the above-described problems, the present invention provides the following rotational motion assisting device.
(1) In a rotational motion assisting device that assists the rotational motion of a rotating body that rotates between a fully open position and a fully closed position,
A coil spring that urges rotation of the rotating body in the opening direction;
A rotary damper that attenuates the biasing force of the coil spring;
A first member that supports the rotary damper;
A second member having a gear portion that is rotatably connected to the first member and meshes with a pinion provided in the rotary damper;
In the coil spring, a connecting portion between the first member and the second member is inserted into the coil portion, and both end portions thereof are locked to the first member and the second member, respectively, and the first member or the second member The member is provided so that the coil portion is wound by rotating with the rotation of the rotating body in the closing direction,
The first member is provided with a space in which the rotary damper is fitted, and is provided with an elastic portion having a claw at a tip, which is disposed around the rotary damper.
The rotary damper is prevented from falling off from the first member by the claw portion, and can be detached from the first member by releasing the function of preventing the claw portion from falling off by deforming the elastic portion. A rotational motion assisting device, characterized in that
(2) The rotation operation assisting device according to (1), wherein the first member and the second member are connected by fitting a shaft and a hole.
(3) an engaging portion provided on any one of the first member and the second member;
An engaged portion provided on the other of the first member and the second member,
The engaging portion and the engaged portion are engaged by applying an external force in the closing direction to the rotating body when the rotating body reaches the fully closed position, and then the external force in the closing direction is again applied to the rotating body. The rotation operation assisting device according to (1) or (2), further comprising a latch mechanism that can release the engagement.
(4) Of the coil spring, the rotary damper, and the latch mechanism, the latch mechanism is provided at a position farthest from a connecting portion between the first member and the second member. The rotational motion assisting device according to (3).

According to the present invention described in (1) above, the rotary damper is supported by the first member, and the coil spring has the connecting portion of the first member and the second member inserted through the coil portion, and the first member and the first member Both end portions are respectively locked to the two members, and the first member or the second member is provided so that the coil portion is wound by rotating with the rotation of the rotating body in the closing direction. In other words, the rotary damper and the coil spring are integrated via the first member and the second member, but are arranged without being directly coupled, so that the rotary damper remains in a state where the coil spring is installed. Can only be removed. In addition, the first member is provided with a space in which the rotary damper is fitted, and is provided with an elastic portion having a claw at the tip, which is disposed around the rotary damper. The first member can be prevented from falling off, and the elastic portion can be deformed to release the claw portion from falling off and to be detached from the first member. Therefore, it is easy to remove the rotary damper. In addition, the elastic part is deformed, and the function of preventing the claw part from falling off is released. By simply fitting the rotary damper into the space formed in the first member, the elastic part is then restored to prevent the claw part from falling off. Since the function is restored and the rotary damper is prevented from falling off the first member, the rotary damper can be easily attached. Therefore, the rotary damper can be easily replaced with another rotary damper having different characteristics. Further, since the rotation damper can be easily replaced, the rotation speed of the rotating body can be easily changed.
According to the present invention described in (2) above, since the first member and the second member are connected by fitting the shaft and the hole, the connection between the first member and the second member is easily released. In addition, the first member and the second member can be easily connected. Therefore, it is possible to easily remove only the coil spring while the rotary damper is supported by the first member. Therefore, the coil spring can be easily replaced with another coil spring having different characteristics. Further, since the coil spring can be easily replaced, the rotational speed of the rotating body can be easily changed.
According to the present invention described in (3), since the latch mechanism is provided, the rotating body can be held so as not to rotate in the opening direction at the fully closed position, and the rotating body is closed in the closing direction. The holding can be released by applying an external force. Further, in the configuration of the present invention, these members are integrated as a single device including a coil spring, a rotary damper, and a latch mechanism. These members are respectively interposed through the first member and the second member. Therefore, the overall height of the device can be reduced (thinner thickness can be reduced) as compared with the conventional rotational motion assisting device.
According to the present invention described in (4) above, among the coil spring, the rotary damper, and the latch mechanism, the latch mechanism is provided at a position farthest from the connecting portion of the first member and the second member. It is possible to engage the engaging portion and the engaged portion constituting the latch mechanism with a smaller external force, and to release the engaged state with a smaller external force.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.

  FIG. 1 is a diagram illustrating a rotational motion assisting device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. As shown in these drawings, the rotational motion assisting device according to the present embodiment includes a first member 10, a second member 20, a coil spring 30, a rotary damper 40, and a latch mechanism 50.

  The first member 10 is configured as follows (see FIG. 3). That is, the first member 10 has a space 11 into which the rotary damper 40 is fitted. The space 11 is open to the one surface 10 a side of the first member 10 so that the rotary damper 40 can be fitted from the outside of the first member 10. An end wall 12 is provided at the back of the space 11, and the depth of the space 11 (which means the distance from the one surface 10 a of the first member 10 to the end wall 12) is the thickness of the main body case 41 of the rotary damper 40. It is set larger than this. A recess 13 is formed in the peripheral wall of the space 11. The recess 13 functions as a rotation stopper that prevents the rotation of the main body case 41 of the rotary damper 40 by fitting the flange 42 provided in the main body case 41 of the rotary damper 40 into the recess 13.

  The first member 10 is also provided with an elastic portion 14 disposed around the rotary damper 40 inside the space 11. The elastic portion 14 is a projecting piece that protrudes from the end wall 12 toward the outside of the first member 10, and is provided at four locations around the rotary damper 40 at intervals. A claw portion 15 is provided at the tip of the elastic portion 14, and the distance between the facing surfaces of the claw portion 15 and the end wall 12 is set to be approximately the same as the thickness of the main body case 41 of the rotary damper 40. ing.

  The first member 10 is also provided with a shaft 16 that protrudes from the other surface 10 b of the first member 10. A hole 17 concentric with the shaft 16 is formed in the shaft 16. A shaft serving as the rotation center of the rotating body can be inserted into the hole portion 17. A gear portion (hereinafter referred to as “first gear portion”) is provided at one end of the first member 10. The first gear portion 18 is semicircular, and the first gear portion 18 and the shaft 16 are concentric. At the other end of the first member 10, an engaging portion 51 that constitutes the latch mechanism 50 is provided.

  A protruding portion 21 that protrudes from one surface 20 a of the second member 20 is provided at one end of the second member 20. A hole 22 concentric with the protrusion 21 is formed in the protrusion 21, and the shaft 16 of the first member 10 is inserted into the hole 22. The difference between the outer diameter of the shaft 16 of the first member 10 and the inner diameter of the hole 22 formed in the protruding portion 21 is set to be small, and the second member 20 is connected to the shaft 16 and the protruding portion 21 of the first member 10. It is connected to the first member 10 by fitting with the formed hole 22.

  The second member 20 is also provided with a gear portion (hereinafter referred to as “second gear portion”) that meshes with a pinion 43 provided on the rotary damper 40. The 2nd gear part 23 is fan-shaped, and the 2nd gear part 23 and the protrusion part 21 are concentric. An engaged portion 52 constituting the latch mechanism 50 is provided at the other end of the second member 20.

  The coil spring 30 includes a coupling portion (a portion where the shaft 16 of the first member 10 and the protruding portion 21 of the second member 20 are coupled to the coil portion 31 of the coil spring 30. The same shall apply hereinafter). Both ends of the coil spring 30 are engaged with the first member 10 and the second member 20, respectively. The coil spring 30 is provided so that the coil portion 31 of the coil spring 30 is wound by rotating the first member 10 or the second member 20 as the rotating body rotates in the closing direction.

  The rotary damper 40 fits into the space 11 formed in the first member 10, and the main body case 41 of the rotary damper 40 is sandwiched between the end wall 12 provided on the first member 10 and the claw portion 15. It is attached in the form. In addition, the periphery of the main body case 41 is supported by the elastic portion 14 provided in the first member 10. Furthermore, the collar part 42 provided in the main body case 41 fits into the recessed part 13 formed in the 1st member 10, and, thereby, the main body case 41 is fixed so that rotation is impossible. The rotary damper 40 attached in this way is prevented from dropping from the first member 10 by the claw portion 15. A pinion 43 is attached to the rotation shaft 44 of the rotary damper 40.

  The latch mechanism 50 includes an engaging part 51 and an engaged part 52. In this embodiment, the engaging part 51 is provided on the first member 10 and the engaged part 52 is provided on the second member 20. However, the engaging part 51 is provided on the second member 20 and the engaged part is engaged. The part 52 may be provided in the first member 10. When the rotating body reaches the fully closed position, the engaging portion 51 and the engaged portion 52 are engaged by applying an external force in the closing direction to the rotating body, and then the external force in the closing direction is again applied to the rotating body. What is necessary is just to have the structure which can cancel | release engagement by this.

  In the present embodiment, the engaging portion 51 is composed of a protrusion having a portion 51a bulging at the tip. On the other hand, the engaged portion 52 is provided behind the contact portion 52a, a contact portion 52a with which the engagement portion 51 contacts, a spring (not shown) that biases forward movement of the contact portion 52a. The distance between the heart cam structure (not shown) and the abutting portion 52a is reduced, and the bulged portion of the tip engages with the bulged portion 51a of the engaging portion 51, thereby engaging the engaging portion. And a pair of sandwiching portions 52b and 52b for sandwiching 51.

  In the latch mechanism 50 configured as described above, when the engaging portion 51 comes into contact with the contact portion 52a of the engaged portion 52 and the contact portion 52a moves backward, the contact portion 52a is Hold in the retracted position. In addition, due to the retreat of the contact portion 52a, the interval between the sandwiching portions 52b and 52b is narrowed, and the bulging portion formed at the tip of each sandwiching portion 52b and 52b is formed at the tip of the engaging portion 51. The engaging portion 51 is held between the holding portions 52b and 52b by engaging with the protruding portion 51a. On the other hand, after the engaging portion 51 is engaged with the engaged portion 52 in this way, when the abutting portion 52a is pushed back by the engaging portion 51 and retreats again, the action of the heart cam structure causes the abutting portion 52a to move. Holding in the retracted position is released. As a result, the contact portion 52a moves forward by the action of the spring, and accordingly, the interval between the holding portions 52b and 52b is widened, and the bulging portion formed at the tip of each holding portion 52b and 52b and the engaging portion 51. The engagement with the bulged portion 51a formed at the tip of the is released. As a result, the engagement between the engaging portion 51 and the engaged portion 52 is released.

  Here, since the 1st member 10 or the 2nd member 20 rotates centering on those connection parts, the engaging part which constitutes latch mechanism 50, so that the distance between the connection part and latch mechanism 50 becomes large. 51 and the engaged portion 52 can be engaged with a smaller external force, and the engaged state can be released with a smaller external force. Therefore, the latch mechanism 50 is preferably provided at a position farther from the connecting portion between the first member 10 and the second member 20 than the coil spring 30 and the rotary damper 40 as in the present embodiment.

  In the present embodiment, these members are integrated as a single device including the coil spring 30, the rotary damper 40, and the latch mechanism 50, as in the conventional rotational motion assisting device. However, since these members are assembled via the first member 10 and the second member 20, respectively, and arranged without being directly coupled, the rotational motion assisting device according to the present embodiment is a conventional rotation. Compared with the motion assisting device, the overall height of the device can be reduced (thinness is reduced).

  The rotation operation assisting device according to the present embodiment is installed as shown in FIG. 4, for example, in order to assist the rotation operation of the rotating body that rotates between the fully open position and the fully closed position. That is, when the rotational motion assisting device according to the present embodiment is applied to, for example, a cup holder (an instrument for holding a container containing drinking water or the like) installed in a car, a lid that is a rotating body. A support shaft 62 of the lid 61 serving as the rotation center of 61 is inserted through the hole 17 formed in the shaft 16 of the first member 10. The support shaft 62 of the lid 61 rotates as the lid 61 rotates. By coupling the hole 17 to the support shaft 62, the first member 10 can be moved as the lid 61 rotates. It is installed so as to rotate about the support shaft 62 of 61. The second member 20 is fixed to the side surface of the holder main body 63.

  The rotational motion assisting device according to the present embodiment can be installed simply by attaching the first member 10 and the second member 20 as described above. Therefore, the installation work is easy. In addition, even in a small size such as a cup holder, since the thickness of the entire apparatus can be reduced as described above, even if the width of the installation space is less than 15 mm, for example, The thickness can be set to be thinner than the width.

  The rotational motion assisting device installed as described above rotates in the direction in which the first member 10 approaches the second member 20 when the lid 61 rotates in the closing direction. The coil portion 31 of the coil spring 30 is tightened by the first member 10 rotating as the lid 61 rotates in the closing direction. As a result, the coil spring 30 stores a force for biasing the lid 61 to rotate in the opening direction (hereinafter referred to as “biasing force”).

  When an external force in the closing direction is applied to the lid 61 when the lid 61 reaches the fully closed position, the engaging portion 51 and the engaged portion 52 constituting the latch mechanism 50 are engaged with each other. However, with the arrangement of the latch mechanism in the conventional rotational motion assisting device, when the rotating body reaches the fully closed position, the urging force of the spring is maximized, and the rotating damper is bidirectional (accommodated in the main body case). When the one that exhibits the braking force regardless of the rotation direction of the rotor is employed, the braking force of the rotary damper is also applied to the rotating body, so the engaging portion is engaged with the engaged portion. In order to achieve this, considerable external force is required. In this regard, in this embodiment, the latch mechanism 50 is provided at a position farthest from the connecting portion between the first member 10 and the second member 20, and therefore the engaging portion 51 is engaged with the engaged portion 52 with a small external force. Can be engaged. The lid 61 is held so as not to rotate in the opening direction at the fully closed position when the engaging portion 51 and the engaged portion 52 are engaged with each other.

  When the lid 61 is opened, an external force in the closing direction is again applied to the lid 61 so that the engaged state between the engaging portion 51 and the engaged portion 52 is released. At this time, in this embodiment, since the latch mechanism 50 is provided at a position farthest from the connecting portion between the first member 10 and the second member 20, the engaging portion 51 and the engaged portion 52 with a small external force. The engagement state can be released.

  When the engaged state between the engaging portion 51 and the engaged portion 52 is released, the urging force stored in the coil spring 30 is released. As a result, the first member 10 tends to rotate rapidly in a direction away from the second member 20. However, the pinion 43 provided on the rotary damper 40 rotates around the second gear portion 23 while meshing with the second gear portion 23 provided on the second member 20 as the first member 10 rotates. By doing so, the rotary damper 40 exerts a braking force to attenuate the biasing force of the coil spring 30. Thereby, the rotational speed of the 1st member 10 is decelerated. Therefore, according to the rotation operation assisting device according to the present embodiment, the lid 61 can be rotated in the opening direction at a slow speed.

  Furthermore, according to the rotation operation assisting device according to the present embodiment, there is an advantage that the characteristics of the coil spring 30 and the rotation damper 40 that determine the rotation speed of the rotating body in the opening direction can be easily changed. That is, the rotary damper 40 and the coil spring 30 are integrated via the first member 10 and the second member 20, but are disposed without being directly coupled, so that the coil spring 30 is installed. Only the rotary damper 40 can be removed. In addition, the rotary damper 40 is fixed to the first member 10. The fixing method is provided at the tip of the elastic portion 14 arranged around the rotary damper 40 without using screws or the like. The claw portion 15 only prevents the first member 10 from falling off. Therefore, the rotary damper 40 can be easily removed simply by pushing the claw 15 outward so that the elastic portion 14 is separated from the rotary damper 40 and releasing the function of preventing the claw 15 from falling off. Further, when the rotary damper 40 is attached, the claw portion 15 is pushed outward, the elastic portion 14 is deformed, and the function of preventing the claw portion 15 from falling off is released. After that, only by fitting 40, the function of preventing the claw 15 from falling off is restored by the restoring action of the elastic portion 14, and the rotary damper 40 is prevented from falling off the first member 10. Accordingly, the rotary damper 40 can be easily attached. Therefore, the rotary damper 40 can be easily replaced with another rotary damper 40 having different characteristics. Moreover, since the exchange of the rotary damper 40 is easy, the rotational speed of the rotating body can be easily changed.

  On the other hand, the coil spring 30 is attached such that the connecting portion of the first member 10 and the second member 20 is inserted through the coil portion 31. Since the two members are connected together, the connection between the first member 10 and the second member 20 can be easily released, and the first member 10 and the second member 20 can be easily connected. . Therefore, it is possible to easily remove only the coil spring 30 while the rotary damper 40 is supported by the first member 10. Therefore, the coil spring 30 can be easily replaced with another coil spring 30 having different characteristics. Moreover, since the coil spring 30 can be easily replaced, the rotational speed of the rotating body can be easily changed.

  The rotation assisting device according to the present embodiment can be installed as shown in FIG. 5, for example. That is, when the gear 64 is provided on the lid 61 of the cup holder, the first member 10 is disposed so that the first gear portion 18 provided on the first member 10 meshes with the gear 64. The second member 20 is fixed to the holder body 63.

  In the rotational motion assisting device installed in this way, when the lid 61 rotates in the closing direction, the gear 64 provided on the lid 61 and the first gear portion 18 provided on the first member 10 mesh with each other. The first member 10 rotates in a direction close to the second member 20 because the first member 10 rotates in opposite directions. On the other hand, when the lid 61 rotates in the opening direction, the first member 10 rotates in a direction away from the second member 20. The actions of the coil spring 30, the rotary damper 40, and the latch mechanism 50 when the first member 10 rotates in the direction approaching or separating from the second member 20 are the same as described above.

  According to the present embodiment, since the first gear portion 18 is provided in the first member 10, even if the rotating body is provided with a gear as described above, it is installed without any transmission member. Can do. Further, by providing the first gear portion 18, not only the connection with the shaft provided in the application target but also the gear can be handled, so that versatility can be improved.

  FIG. 6 is a view showing an example in which a rotational motion assisting device according to another embodiment of the present invention is applied to a cup holder. As shown in this figure, the rotation assisting device according to the present embodiment is different from the first embodiment in the configuration of the engaging portion 51 and the engaged portion 52 that constitute the latch mechanism 50, and the other configurations are the same as in the embodiment. Same as 1.

  In other words, in this embodiment, the engaging portion 51 is composed of a pin fixed to the end portion of the first member 10, and the engaged portion 52 is swingably provided at the end portion of the second member 20. It is comprised.

  According to the latch mechanism 50 of the present embodiment, when the engaging portion 51 abuts on the heart cam 53 constituting the engaged portion 52, the heart cam 53 swings and the engaging portion 51 and the heart cam 53 are coupled. . Thereby, it will be in the state which the engaging part 51 and the to-be-engaged part 52 engaged. On the other hand, when the engaging portion 51 moves in the closing direction, the coupling between the engaging portion 51 and the heart cam 53 is released, whereby the engaged state between the engaging portion 51 and the engaged portion 52 is released.

  FIG. 7 is a view showing an example in which a rotational motion assisting device according to still another embodiment of the present invention is applied to a cup holder. As shown in this figure, the rotation assisting device according to the present embodiment is different from the first embodiment in the configuration of the engaging portion 51 and the engaged portion 52 that constitute the latch mechanism 50, and the other configurations are the same as in the embodiment. Same as 1.

  That is, in this embodiment, the engaging portion 51 is formed of a pin that is swingably provided at the end portion of the first member 10, and the engaged portion 52 is fixed to the end portion of the second member 20. It is comprised.

  According to the latch mechanism 50 of the present embodiment, when the engaging portion 51 is coupled to the heart cam 53 constituting the engaged portion 52 and then moves in the closing direction again, the engaging portion 51 swings and the heart cam 53 is moved. The engagement portion 51 and the heart cam 53 are disconnected from each other. Thereby, the engagement state of the engaging part 51 and the engaged part 52 is released.

It is a figure which shows the rotational movement assistance apparatus which concerns on one Example of this invention. It is an AA section sectional view in FIG. It is sectional drawing which shows a 1st member. It is a figure which shows an example which applied the rotational operation assistance apparatus which concerns on Example 1 to the cup holder, (a) shows the state in which the cover of a cup holder exists in a full open position, (b) is a cover of a cup holder fully closed Indicates the state at the position. It is a figure which shows the other example which applied the rotational operation assistance apparatus which concerns on Example 1 to a cup holder, (a) shows the state in which the cover of a cup holder exists in a full open position, (b) shows the cover of a cup holder The state in the fully closed position is shown. It is a figure which shows an example which applied the rotational operation assistance apparatus which concerns on the other Example of this invention to the cup holder, (a) shows the state in which the cover of a cup holder exists in a full open position, (b) The state in which the lid is in the fully closed position is shown. It is a figure which shows an example which applied the rotational operation assistance apparatus which concerns on the further another Example of this invention to the cup holder, (a) shows the state in which the cover of a cup holder exists in a full open position, (b) is a cup holder Shows a state in which the lid is in the fully closed position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st member 11 Space 12 End wall 13 Recessed part 14 Elastic part 15 Claw part 16 Shaft 17 Hole part 18 First gear part 20 Second member 21 Projection part 22 Hole 23 Second gear part 30 Coil spring 31 Coil part 40 Rotation damper 41 body case 42 collar portion 43 pinion 44 rotating shaft 50 latch mechanism 51 engaging portion 52 engaged portion 52a abutting portion 52b clamping portion 53 heart cam 61 lid 62 support shaft 63 holder main body 64 gear

Claims (4)

In the rotational motion assisting device that assists the rotational motion of the rotating body that rotates between the fully open position and the fully closed position,
A coil spring that urges rotation of the rotating body in the opening direction;
A rotary damper that attenuates the biasing force of the coil spring;
A first member that supports the rotary damper;
A second member having a gear portion that is rotatably connected to the first member and meshes with a pinion provided in the rotary damper;
In the coil spring, a connecting portion between the first member and the second member is inserted into the coil portion, and both end portions thereof are locked to the first member and the second member, respectively, and the first member or the second member The member is provided so that the coil portion is wound by rotating with the rotation of the rotating body in the closing direction,
The first member is provided with a space in which the rotary damper is fitted, and is provided with an elastic portion having a claw at a tip, which is disposed around the rotary damper.
The rotary damper is prevented from falling off from the first member by the claw portion, and can be detached from the first member by releasing the function of preventing the claw portion from falling off by deforming the elastic portion. A rotational motion assisting device, characterized in that   2. The rotation operation assisting device according to claim 1, wherein the first member and the second member are connected to each other by fitting of a shaft and a hole. An engaging portion provided on one of the first member and the second member;
An engaged portion provided on the other of the first member and the second member,
The engaging portion and the engaged portion are engaged by applying an external force in the closing direction to the rotating body when the rotating body reaches the fully closed position, and then the external force in the closing direction is again applied to the rotating body. The rotation operation assisting device according to claim 1, further comprising a latch mechanism that can release the engagement. The said latch mechanism is provided in the position most distant from the connection part of a said 1st member and a said 2nd member among the said coil spring, the said rotation damper, and the said latch mechanism. The rotational motion assisting device described.

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