JP6616864B2 - Damper - Google Patents

Description

  The present invention relates to a damper that is mounted on an opening / closing member such as a toilet seat or a toilet lid that is supported so as to open and close by rotation, and that mitigates an impact when the opening / closing operation of the opening / closing member stops at a predetermined position.

  In general, an opening / closing member such as a toilet seat or toilet lid that is supported to rotate and open is equipped with a damper that alleviates an impact when the opening / closing operation stops at a predetermined position. As such a damper, a rotary damper having a housing in which a viscous fluid such as silicon oil is sealed and a rotating member rotatably mounted on the housing is practically used. In this rotary damper, by applying a torque opposite to the rotation of the rotating member to the rotating member due to the viscous resistance of the viscous fluid, the impact when the opening / closing operation stops at a predetermined position is reduced. Yes.

  However, the rotary damper has a problem that the viscous fluid in the housing may leak. In winter, when the temperature is low, the viscosity of the viscous fluid increases, so the opening / closing speed of the opening / closing member decreases.In summer, when the temperature is high, the viscosity of the viscous fluid decreases, so the opening / closing speed of the opening / closing member increases. There is also a problem that the characteristics vary with time.

  In Patent Document 1 below, as a damper for solving the above-described problem, a housing in which a cylindrical projecting portion having a tapered cross-sectional shape is formed, and an inner peripheral surface of the cylindrical projecting portion of the housing are rotatably fitted. A rotating member having a cylindrical end portion, a tapered section to be tightened, and a connecting portion connected to the opening and closing member, one end portion being attached to the housing and the other end portion being attached to the rotating member, and A damper is disclosed that includes a protrusion and a coil spring disposed radially outward of the tightened portion of the rotating member.

  In this damper, as the amount of rotation of the rotating member increases with the opening / closing operation of the opening / closing member, from the large diameter side of each of the outer peripheral surface of the cylindrical projection of the housing and the outer peripheral surface of the tightened portion of the rotating member. The coil springs are wound while decreasing in diameter toward the smaller diameter side. That is, as the amount of rotation of the rotating member from the initial position increases, the amount of winding of the coil spring around the outer peripheral surface of the cylindrical protrusion and the outer peripheral surface of the tightened portion increases.

  In general, the amount of bending of a long member such as a coil spring increases with the cube of its length, so the length of the coil spring (the amount of bending of the coil spring) that does not wrap around the outer peripheral surface of the cylindrical projection and the outer peripheral surface of the tightened portion. The rigidity of the coil spring increases as the length (related to) decreases. Therefore, in the damper having a structure in which the coil spring is wound around the outer peripheral surface of the tightened portion like the damper disclosed in Patent Document 1 below, the rigidity of the coil spring increases as the amount of the coil spring wound around the tightened portion increases. Since the torque of the coil spring acting on the member increases, the impact when the opening / closing operation of the opening / closing member stops at a predetermined position is alleviated.

JP 2000-329150 A

  In the damper disclosed in Patent Document 1, when the use is repeated, the cylindrical protrusion around which the coil spring is wound and the tightened portion are worn, and the torque characteristics of the coil spring acting on the rotating member may change. is there. Therefore, in order to suppress wear due to winding of the coil spring, a relatively expensive material having excellent wear resistance is used for the housing having the cylindrical protrusion and the rotating member having the tightened portion, which increases the manufacturing cost. There is a problem that it ends up. Further, when the cylindrical protrusion or the tightened portion is worn, it is necessary to replace the entire housing and the entire rotating member, and there is a problem that the maintenance cost increases.

  Further, in the damper disclosed in Patent Document 1, in order to adjust the torque characteristics according to the size and mass of the rotating member, the outer peripheral surface shape of the protrusion of the housing and the outer peripheral surface shape of the tightened portion of the rotating member However, it is necessary to prepare a large number of different parts, and it is difficult to make the parts common.

  The problem of the present invention made in view of the above facts is that it is possible to reduce the manufacturing cost by reducing the amount of use of a relatively expensive material excellent in wear resistance, and according to the size and mass of the opening / closing member. It is another object of the present invention to provide a damper that can easily change torque characteristics.

In order to solve the above problems, the present invention provides the following dampers. That is, “a damper that is mounted on an opening / closing member that is supported so as to open and close by rotation, and that relieves shock when the opening / closing operation of the opening / closing member stops at a predetermined position, A rotating shaft having a cylindrical shaft portion rotatably supported in the internal space of the housing and a connecting portion connected to the opening and closing member; and one end portion attached to the housing and the rotating member. A coil spring having an end attached thereto, and a wound member that is installed inside the coil spring and wound while the diameter of the coil spring is reduced when the rotating member rotates, the wound member having an outer diameter frustoconical shaped outer peripheral surface, is formed by a material having high wear resistance than the housing, rotatably mounted is detachably attached to the housing but to decrease gradually As the amount of rotation of the rotating member increases with the opening / closing operation of the opening / closing member, the amount of winding of the coil spring increases, from the large diameter side to the small diameter side of the frustoconical outer peripheral surface of the member to be wound "A damper in which the coil spring is wound sequentially toward".

As an embodiment of the present invention, the following configuration can be adopted.
Preferably, the housing includes a circular end wall and a cylindrical peripheral wall extending in one axial direction from a peripheral edge of the end wall, and the inner space is defined by the inner surface of the end wall and the inner surface of the peripheral wall. A cylindrical boss projecting into the internal space is connected to the inner surface of the end wall, and the shaft of the rotating member is fitted to the inner peripheral surface of the boss so as to be rotatable. The supported member is fitted and attached to the outer peripheral surface of the boss portion.
The frustoconical outer peripheral surface of the member to be wound can be formed in a cross-sectional arc shape in which the decreasing rate of the outer diameter gradually increases.
A first receiving recess extending in the radial direction is formed on the inner surface of the housing, and a receiving piece is connected to the outer peripheral surface of the shaft portion of the rotating member, and the receiving piece extends in the radial direction. Two receiving recesses are formed, one end of the coil spring extends in the radial direction and is received in the first receiving recess, and the other end of the coil spring extends in the radial direction and the second Conveniently accommodated in a receiving recess.
The wound member is preferably made of polyphenylene sulfide resin containing carbon fiber or glass fiber.

  In the damper provided by the present invention, since the coil spring is wound around the member to be wound, the member to be wound that wears over repeated use may be formed of a material having excellent wear resistance. Therefore, according to the damper of the present invention, the amount of use of a relatively expensive material having excellent wear resistance can be reduced, so that the manufacturing cost can be reduced, and the torque characteristics change due to wear. In the case of jamming, the member to be wound may be replaced, so that the maintenance cost can be reduced.

  Moreover, in the damper of this invention, the torque characteristic of a damper can be easily changed according to the dimension and mass of an opening-and-closing member by preparing several to-be-wrapped members from which an outer peripheral surface shape differs. Therefore, according to the damper of the present invention, it is possible to share components other than the member to be wound between a plurality of dampers having different torque characteristics.

  In the damper of the present invention, the housing includes a circular end face wall and a cylindrical peripheral wall extending from the periphery of the end face wall to one side in the axial direction, and an inner space is defined by the inner face of the end face wall and the inner face of the peripheral face wall. A cylindrical boss projecting into the internal space is connected to the inner surface of the face wall, the shaft of the rotating member is fitted to the inner peripheral surface of the boss and is rotatably supported, and the member to be wound is a boss. If the outer peripheral surface of the housing is fitted and mounted, the boss portion of the housing makes it easy to mount the shaft portion of the rotating member and the member to be wound on the housing, and reduce the assembly time of the damper. Can do.

  In the damper of the present invention, it is possible to adjust the torque characteristics of the damper by changing the frustoconical outer peripheral surface of the member to be wound to various ones. For example, when the frustoconical outer peripheral surface is formed in a cross-sectional arc shape in which the decreasing rate of the outer diameter gradually increases, the amount of winding of the coil spring rapidly increases near the initial position of the rotating member, and then gradually increases. Thus, as the amount of rotation of the rotating member increases, the amount of winding of the coil spring increases in a form approximating a sine curve (sine curve). As a result, it is possible to obtain a characteristic in which the torque of the coil spring acting on the rotating member increases in a sinusoidal shape, but the torque in the closing direction caused by gravity acting on the opening / closing member such as the toilet seat or toilet lid of the toilet is rotated. Since it changes in a sinusoidal shape according to the angle, when the damper having such characteristics is applied, the descending speed (closing speed) of the toilet seat or the like can be made substantially constant.

  Further, in the damper of the present invention, a first housing recess extending in the radial direction is formed on the inner surface of the housing, and a housing piece is connected to the outer peripheral surface of the shaft portion of the rotating member, and the housing piece is in the radial direction. A second receiving recess is formed extending in the radial direction, one end of the coil spring extends in the radial direction and is received in the first receiving recess, and the other end of the coil spring extends in the radial direction and the second receiving recess. When housed in the recess, when both ends of the coil spring extend in the axial direction and are attached to the housing and the rotating member, when a load acts on the coil spring by the rotation of the rotating member, Since the stress based on the twist generated in the coil spring is alleviated, the life of the coil spring can be improved.

  Furthermore, in the damper of the present invention, when the member to be wound is formed of a polyphenylene sulfide resin containing carbon fiber or glass fiber, the production is easy and the life of the member to be wound can be improved.

(A) Front view of damper constructed according to the present invention, (b) AA line cross-sectional view in (a), (c) (B) cross-sectional view in BB line. (A) Front view of housing shown in FIG. 1, (b) CC sectional view taken on the line in (a), (c) Rear view of housing shown in FIG. (A) Front view of rotating member shown in FIG. 1, (b) DD sectional view in (a), (c) Rear view of rotating member shown in FIG. (A) Front view of coil spring shown in FIG. 1, (b) Side view of coil spring shown in FIG. (A) The front view of the to-be-wrapped member shown in FIG. 1, (b) The EE sectional view taken on the line in (a). (A) The front view of the shield member shown in FIG. 1, (b) The FF sectional view taken on the line in (a). (A) Sectional drawing of a damper in the state which the rotation member rotated counterclockwise 30 degree seeing from the back surface from the initial position shown in FIG. 1, (b) GG sectional drawing in (a). (A) Sectional drawing of a damper in the state which the rotating member rotated 110 degree | times counterclockwise seeing from the back surface from the initial position shown in FIG. 1, (b) HH sectional view taken on the line in (a).

  A preferred embodiment of a damper constructed according to the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, the damper denoted as a whole by reference numeral 2 is mounted on an opening / closing member (not shown) such as a toilet seat or toilet lid, which is supported so as to rotate and open, and opens / closes the opening / closing member. This is to alleviate the impact when the operation stops at a predetermined position. The housing 4, the rotating member 6 that is rotatably supported by the housing 4 and connected to the opening / closing member, and one end of the housing 4 are attached. In addition, a coil spring 8 having the other end attached to the rotating member 6, a member to be wound 10 that is wound while the diameter of the coil spring 8 is reduced when the rotating member 6 rotates, and a shield member 12 that covers the open end of the housing 4, Is provided.

  The housing 4 will be described with reference to FIGS. 1 and 2. The housing 4 is made of a synthetic resin such as polybutylene terephthalate (PBT). The housing 4 includes a circular end surface wall 14 and a cylindrical peripheral surface wall 16 extending from the periphery of the end surface wall 14 to one side in the axial direction, and is formed in a bottomed cylindrical shape as a whole. As shown in FIG. 2B, in the housing 4, an inner space 18 having a circular cross section is defined by the inner surface of the end wall 14 and the inner surface of the peripheral wall 16.

  As shown in FIG. 2, a circular through-opening 20 is formed in the central portion of the end face wall 14, and a cylindrical boss portion 22 protruding into the internal space 18 from the periphery of the through-opening 20 is formed on the inner surface of the end face wall 14. It is connected. In addition, a first annular recess 24 extending along the outer peripheral edge of the boss portion 22 is formed on the inner surface of the end face wall 14. The first annular recess 24 has a small-diameter portion 24a and a large-diameter portion 24b, and the first annular recess 24 has steps having different radial dimensions in the axial direction.

  As shown in FIG. 2A, the end face wall 14 is formed with a pair of arc-shaped openings 26 on both sides in the radial direction of the through opening 20 and spaced from the through opening 20. As understood by referring to FIG. 2 (c), the pair of arc-shaped openings 26 are continuous with the small diameter portion 24 a of the first annular recess 24 in the axial direction. Further, a first receiving recess 28 extending outward in the radial direction from the large diameter portion 24 b of the first annular recess 24 is formed on the inner surface of the end face wall 14.

  As shown in FIG. 2C, an arc-shaped rotation restricting portion 30 that protrudes inward in the radial direction and extends in the circumferential direction is formed on the inner surface of the peripheral wall 16 of the housing 4. The rotation limiting unit 30 in the illustrated embodiment is formed in a range of 160 degrees. As shown in FIG. 2B, an annular shield member mounting portion 32 having an enlarged inner diameter is formed at the open end of the inner surface of the peripheral wall 16.

  The rotating member 6 will be described with reference to FIGS. 1 and 3. The rotating member 6 is made of a synthetic resin such as polybutylene terephthalate (PBT) or a metal material. The rotating member 6 is connected to a columnar shaft portion 34 rotatably supported in the internal space 18 of the housing 4, a disk-shaped accommodation piece 36 connected to the outer peripheral surface of the shaft portion 34, and an opening / closing member. Connecting portion 38.

  The diameter of the shaft portion 34 in the illustrated embodiment corresponds to the inner diameter of the boss portion 22 of the housing 4, and the shaft portion 34 is detachably fitted to the inner peripheral surface of the boss portion 22 and is rotatably supported. ing. In the damper 2 of the illustrated embodiment, it is easy to mount the shaft portion 34 of the rotating member 6 on the housing 4 by the boss portion 22 of the housing 4, and the assembly time can be shortened.

  As shown in FIGS. 3A and 3B, a second annular recess 40 extending along the periphery of the shaft portion 34 is provided on one side surface (the left side surface in FIG. 3B) of the accommodation piece 36. Is formed. The second annular recess 40 has a small-diameter portion 40a and a large-diameter portion 40b, and the second annular recess 40 has steps having different radial dimensions in the axial direction. A second receiving recess 42 that extends radially outward from the large-diameter portion 40 b of the second annular recess 40 is formed on one side surface of the receiving piece 36. An arcuate portion 44 that protrudes radially outward and extends in the circumferential direction is formed on the outer peripheral surface of the accommodation piece 36. The arcuate portion 44 of the illustrated embodiment is formed in a range of 90 degrees around the second receiving recess 42. As shown in FIG. 1, when the shaft portion 34 is fitted to the inner peripheral surface of the boss portion 22, the accommodation piece 36 is accommodated in the internal space 18 of the housing 4.

  The connecting portion 38 in the illustrated embodiment has a columnar shape and protrudes in the axial direction from the other side surface (the right side surface in FIG. 3B) of the receiving piece 36, and the central axis of the connecting portion 38 is the axis of the shaft portion 34. Aligned with the central axis. In addition, a pair of flat surfaces 46 disposed at positions facing each other are formed on the peripheral surface of the connecting portion 38. As shown in FIG. 1, when the shaft portion 34 is fitted to the inner peripheral surface of the boss portion 22, the connection portion 38 protrudes outward from the internal space 18 of the housing 4. When the connecting portion 38 is connected to the opening / closing member, the opening / closing operation of the opening / closing member is transmitted through the pair of flat surfaces 46 so that the rotating member 6 rotates.

  The coil spring 8 will be described with reference to FIGS. 1 and 4. The coil spring 8 is made of a metal material, and as shown in FIG. 4, one end 8 a and the other end 8 b of the coil spring 8 extend outward in the radial direction. Although not shown, one end 8 a of the coil spring 8 is housed in the first housing recess 28 of the housing 4 and attached to the housing 4. On the other hand, the other end portion 8 b of the coil spring 8 is housed in the second housing recess 42 of the rotating member 6 and attached to the rotating member 6 as shown in FIG.

  For this reason, compared with the case where both ends of the coil spring 8 extend in the axial direction and are attached to the housing 4 and the rotating member 6, in the damper 2 of the illustrated embodiment, the coil spring 8 is loaded by the rotation of the rotating member 6. Since the stress or the like based on the twist generated in the coil spring 8 is relieved when acting, the life of the coil spring 8 can be improved. Further, as shown in FIG. 1B, when the coil spring 8 is attached to the housing 4 and the rotating member 6, one end side of the coil spring 8 is positioned at the large diameter portion 24 b of the first annular recess 24 of the housing 4. The other end side of the coil spring 8 is located in the large diameter portion 40 b of the second annular recess 40 of the rotating member 6.

  The wound member 10 will be described with reference to FIGS. 1 and 5. The member to be wound 10 formed of a material having high wear resistance different from that of the housing 4 is formed in a cylindrical shape as a whole from polyphenylene sulfide (PPS) resin containing carbon fiber or glass fiber in the illustrated embodiment.

  As shown in FIG. 5B, the outer diameter of the wound member 10 gradually decreases from one end side in the axial direction (left side in FIG. 5B) to the other end side (right side in FIG. 5B). A frustoconical outer peripheral surface 48 and a cylindrical outer peripheral surface 50 extending from the end on the small diameter side of the frustoconical outer peripheral surface 48 with a constant outer diameter in the axial direction. The frustoconical outer peripheral surface 48 of the illustrated embodiment is formed in a cross-sectional arc shape in which the decreasing rate of the outer diameter gradually increases. In addition, a pair of arcuate protruding pieces 52 disposed at positions facing each other are formed on one end surface of the member to be wound 10 (the right end surface in FIG. 5B).

  The inner diameter of the wound member 10 in the illustrated embodiment corresponds to the outer diameter of the boss portion 22 of the housing 4, and the wound member 10 is disposed on the outer peripheral surface of the boss portion 22 as shown in FIG. The housing 4 is detachably attached to the housing 4. In the damper 2 of the illustrated embodiment, it becomes easy to mount the member to be wound 10 on the housing 4 by the boss portion 22 of the housing 4, and the assembly time can be shortened.

  When the member to be wound 10 is mounted on the housing 4, as shown in FIG. 1A, the pair of arc-shaped projecting pieces 52 are fitted into the pair of arc-shaped openings 26 of the housing 4, and the member to be wound in the housing 4. 10 rotations are prevented. When the member to be wound 10 is mounted on the housing 4, one end side of the member to be wound 10 is positioned at the small diameter portion 24 a of the first annular recess 24 of the housing 4, and the other end side of the member to be wound 10 is The frustoconical outer peripheral surface 48 is located radially inward of the coil spring 8 while being located in the small diameter portion 40 a of the second annular recess 40 of the rotating member 6.

  The shield member 12 will be described with reference to FIGS. 1 and 6. The shield member 12 is formed in a circular shape from a synthetic resin such as polybutylene terephthalate (PBT). As shown in FIG. 6, a circular passage opening 12 a is formed in the central portion of the shield member 12, and the diameter of the passage opening 12 a corresponds to the diameter of the connection portion 38 of the rotating member 6. As shown in FIG. 1, the shield member 12 is detachably mounted on the shield member mounting portion 32 of the housing 4 and covers the open end of the housing 4. When the shield member 12 is mounted on the housing 4, the connecting portion 38 of the rotating member 6 passes through the passage opening 12 a and protrudes outward from the housing 4.

  Next, a method of using the damper 2 as described above will be described. When the damper 2 is mounted on the opening / closing member, the connecting portion 38 of the rotating member 6 is connected to the opening / closing member, and the housing 4 is fixed so as not to rotate. For example, when the damper 2 is mounted on the toilet seat as an opening / closing member, the rotating member 6 is positioned at the initial position shown in FIG. 1 in a state where the toilet seat is positioned above. As shown in FIG. 1C, when the rotating member 6 is located at the initial position, the circumferential one end 44 a of the arcuate portion 44 of the rotating member 6 is the circumferential one end 30 a of the rotation restricting portion 30 of the housing 4. Is in contact with or close to. In the initial position, the coil spring 8 is not wound around the frustoconical outer peripheral surface 48 of the member to be wound 10, or one end side of the coil spring 8 is partially wound around the large diameter side of the frustoconical outer peripheral surface 48. .

  When the lowering operation is applied to the toilet seat, the rotation amount of the rotating member 6 from the initial position increases with the lowering operation of the toilet seat. FIG. 7 shows a state in which the rotating member 6 is rotated 30 degrees counterclockwise when viewed from the back side from the initial position shown in FIG. 1, and FIG. 8 shows the rotating member 6 from the back side from the initial position shown in FIG. A state of being rotated 110 degrees counterclockwise is shown.

  As shown in FIGS. 7 and 8, the amount of winding of the coil spring 8 around the member to be wound 10 increases as the amount of rotation of the rotating member 6 increases. That is, the coil spring 8 is wound while decreasing in diameter from the large diameter side to the small diameter side of the frustoconical outer peripheral surface 48 of the member to be wound 10. As a result, the rigidity of the coil spring 8 is increased and the torque of the coil spring 8 acting on the rotating member 6 is increased, so that the shock when the toilet seat lowering operation stops in contact with the toilet is stopped by the damper 2. When raising the toilet seat, the torque of the coil spring 8 always acts in the raising direction of the toilet seat, and the damper 2 assists the force in the raising direction of the toilet seat, so that the toilet seat can be raised with a small force.

  In the damper 2 of the illustrated embodiment, the frustoconical outer peripheral surface 48 is formed in a cross-sectional arc shape in which the decreasing rate of the outer diameter gradually increases, and as the amount of rotation from the initial position of the rotating member 6 increases, the wound member 10 Since the amount of winding of the coil spring 8 increases in a sinusoidal (sine curve) shape and the torque of the coil spring 8 acting on the rotating member 6 increases in a sinusoidal shape, when the damper 2 is not attached, it is sinusoidal due to gravitational acceleration. By using the damper 2 of this embodiment, the descending speed of the toilet seat at which the descending speed increases becomes a substantially constant descending speed.

  In the illustrated embodiment, when the toilet seat is completely lowered, as shown in FIG. 8A, the entire coil spring 8 is wound around the frustoconical outer peripheral surface 48, and as shown in FIG. The other circumferential end 44 b of the arcuate portion 44 is in contact with or close to the other circumferential end 30 b of the rotation restricting portion 30 of the housing 4. Thus, in the damper 2, the rotation range of the rotating member 6 is limited to a predetermined range (110 degrees in the illustrated embodiment), and therefore the force exceeding the predetermined value due to excessive rotation of the rotating member 6. Acts on the coil spring 8 to prevent the coil spring 8 from being damaged.

  As described above, in the damper 2 of the present invention, the coil spring 8 is wound around the member 10 to be wound, and therefore the member 10 to be wound that wears out as it is used may be formed of a material having excellent wear resistance. Therefore, according to the damper 2 of the present invention, the amount of use of a relatively expensive material excellent in wear resistance can be reduced, so that the manufacturing cost can be reduced, and the torque characteristics change due to wear. If this happens, the member to be wound 10 may be replaced, so that the maintenance cost can be reduced.

  In the damper 2 of the present invention, the torque characteristics of the damper 2 can be easily changed according to the size and mass of the opening / closing member by preparing a plurality of wound members 10 having different outer peripheral surface shapes. The rotary damper is not limited to a toilet seat or a toilet lid, and for example, as disclosed in JP 2013-124524 A, the purpose of absorbing a shock when a sliding door installed at a doorway of a building stops. However, when the damper 2 of the present invention is applied to such an application, it can be changed to a torque characteristic suitable for absorbing the impact of the sliding door only by replacing the member to be wound 10. As described above, according to the damper 2 of the present invention, it is possible to share parts other than the member to be wound 10 between the plurality of dampers 2 having different torque characteristics.

  Further, in the damper 2 of the present invention, the dump effect is obtained by utilizing the elasticity of the coil spring 8, but since the coil spring 8 is wound around the member to be wound 10, the occurrence of spring back is suppressed, for example, the toilet seat The toilet seat does not return in the raising direction when the is moving down.

  In the illustrated embodiment, the boss portion 22 is formed in the housing 4, the shaft portion 34 of the rotating member 6 is fitted to the inner peripheral surface of the boss portion 22, and the member to be wound 10 is formed on the outer peripheral surface of the boss portion 22. Although the example in which the fitting is performed has been described, the boss portion 22 may not be formed in the housing 4. That is, a member to be wound whose inner diameter corresponds to the diameter of the shaft portion 34 of the rotating member 6 is detachably mounted on the housing 4, and the shaft portion 34 may be fitted to the inner peripheral surface of the member to be wound.

2: Damper 4: Housing 6: Rotating member 8: Coil spring 8a: One end portion of the coil spring 8b: Other end portion of the coil spring 10: Wound member 14: End wall 18: Internal space of the housing 22: Boss portion 28: First Housing recess 34: Shaft portion 36: Housing piece 38: Connection portion 42: Second housing recess 48: Frustum-shaped outer peripheral surface

Claims (5)

A damper that is mounted on an opening / closing member that is supported to rotate and open / close, and that alleviates an impact when the opening / closing operation of the opening / closing member stops at a predetermined position,
A housing having an internal space with a circular cross section;
A rotating member having a cylindrical shaft portion rotatably supported in the internal space of the housing and a connecting portion connected to the opening and closing member;
A coil spring having one end attached to the housing and the other end attached to the rotating member;
A coiled member installed inside the coil spring and wound while the coil spring is reduced in diameter when the rotating member rotates;
The wound member has a frustoconical outer peripheral surface whose outer diameter gradually decreases, is formed of a material having higher wear resistance than the housing, and is detachably attached to the housing.
As the amount of rotation of the rotating member increases with the opening / closing operation of the opening / closing member, the amount of winding of the coil spring increases, from the large diameter side to the small diameter side of the frustoconical outer peripheral surface of the member to be wound. A damper around which the coil springs are wound. The housing includes a circular end wall and a cylindrical peripheral wall extending in one axial direction from a peripheral edge of the end wall, and the inner space is defined by the inner surface of the end wall and the inner surface of the peripheral wall, and the end A cylindrical boss projecting into the internal space is connected to the inner surface of the face wall,
The shaft portion of the rotating member is fitted to an inner peripheral surface of the boss portion and is rotatably supported, and the member to be wound is fitted and attached to an outer peripheral surface of the boss portion. The damper described in 1.   The damper according to claim 1 or 2, wherein the frustoconical outer peripheral surface of the member to be wound is formed in a cross-sectional arc shape in which the decreasing rate of the outer diameter gradually increases. A first receiving recess extending in the radial direction is formed on the inner surface of the housing,
A housing piece is connected to the outer peripheral surface of the shaft portion of the rotating member, and a second housing recess extending in the radial direction is formed in the housing piece,
One end of the coil spring extends in the radial direction and is received in the first receiving recess, and the other end of the coil spring extends in the radial direction and is received in the second receiving recess. The damper according to any one of claims 1 to 3.   The damper according to any one of claims 1 to 4, wherein the member to be wound is formed of a polyphenylene sulfide resin containing carbon fiber or glass fiber.