JPH0557471U - Rotary damper - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotary damper capable of easily adjusting the cushioning force. A movable case 61 is rotatably housed inside a cylindrical case body, and a cylindrical outer peripheral wall of the movable case 61 is brought close to a cylindrical inner peripheral wall of the case body with a minute gap therebetween. In the rotary damper configured to generate a resistance force in the rotation direction between the case main body and the movable cylinder 61 by the shear resistance of the viscous fluid interposed, the case main body and the movable cylinder 61.
An adjustable band 70 whose diameter can be expanded / contracted is inserted into the space between them. The fixed end 71 of the adjustment band 70 is fixed to the block 85 provided on the side surface of the case body, and the movable end of the adjustment band 70 is rotatably attached to the block 85. The adjustment band 70 is configured to be expanded / contracted by eccentric rotation of the eccentric pin portion by rotating the adjustment shaft 80.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention is mainly applied to doors, in which a shearing resistance of a viscous fluid generates a resistance force in the rotational direction between a case and a movable body, and the resistance force exerts a cushioning effect against external force. Regarding rotary damper.

[0002]

[Prior Art]

 As this type of damper, the one described in Japanese Patent Application Laid-Open No. 2-292480 is known. This damper is a rotary damper for a door, and a movable member is housed in a cylindrical case so that the movable member can rotate, and a cylindrical outer peripheral wall of the movable member is provided with a small gap in a cylindrical inner peripheral wall of the case. And the viscous fluid interposed in the gap causes a shearing resistance to generate a resistance force in the rotational direction between the case and the movable member.

[0003]

[Problems to be solved by the device]

 By the way, in this type of damper, it may be necessary to adjust the cushioning speed, in other words, the braking force, depending on the object to be attached, but the adjustment described in the above-mentioned conventional publication cannot be performed easily. There was a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary damper capable of easily adjusting a buffer speed, that is, a braking force.

[0005]

[Means for Solving the Problems]

 According to the present invention, a movable body is rotatably housed in a cylindrical case, and a cylindrical outer peripheral wall of the movable body is brought close to a cylindrical inner peripheral wall of the case with a minute gap, and In a rotary damper in which a shearing resistance of a viscous fluid interposed causes a resistance force in the rotational direction to be generated between the case and the movable body, the diameter expansion / contraction is automatically performed in the space between the case and the movable body. The present invention is characterized in that an existing adjustment band is inserted to fix the adjustment band to the case, and a mechanism for expanding and contracting the adjustment band is provided in the case.

[0006]

[Action]

 In the rotary damper of the present invention, when the adjustment band is reduced in diameter, the clearance between the movable body and the adjustment band becomes smaller, and the clear clearance between the case and the movable body becomes substantially smaller, resulting in shear resistance of viscous fluid. Will increase. In this case, the adjustment band directly comes into pressure contact with the outer peripheral wall of the movable body depending on the degree of the diameter reduction, so that the frictional resistance is also added and the rotational resistance of the movable body remarkably increases. This slows down the buffer speed. On the other hand, when the diameter of the adjustment band is expanded, the clearance between the movable body and the adjustment band is increased, and the clearance between the case and the movable body is substantially increased to reduce the shear resistance of the viscous fluid. The rotation resistance of the is reduced and the buffer speed is increased.

[0007]

【Example】

 An embodiment in which the present invention is applied to a rotary damper for a door will be described below with reference to the drawings.

FIG. 3 is a vertical cross-sectional view showing the principle structure of the door rotary damper of the embodiment. In this figure, reference numeral 10 indicates a cylindrical case body. The case body 10 constitutes a damper case together with the lid 30. The case body 10 has a bottom wall 11, and the upper end is open as a mouth 10a. Then, the lid 30 is fitted into the mouth portion 10a, and the engaging projections 35 and 36 formed on the lid 30 engage with the engagement holes 13 and 14 formed in the mouth portion 10a of the case body 10, respectively. Thus, the lid 30 is firmly fixed to the case body 10 in a state where it is stopped from rotating.

Inside the case body 10, a spring housing cylinder 20 is arranged concentrically with the case body 10. The spring accommodating cylinder 20 has its bottom wall 21 fitted into a fitting hole 12 formed in the center of the bottom wall 11 of the case body 10 so as to be fixed against rotation. The spring accommodating cylinder 20 is about half the height of the case body 10 and accommodates the coil spring 40 inside. The coil spring 40 is formed by densely winding a wire rod having a rectangular cross section in the axial direction, and a lower end 41 thereof is fixed to a lower end of the spring housing cylinder 20, that is, a damper case.

Through holes 22, 38 are formed in the center of the bottom wall 21 of the spring housing cylinder 20 and the lid 30, respectively. These through holes 22 and 38 are located on the same axis, and the movable shaft 50 penetrates through these through holes 22 and 38. The movable shaft 50 is movably supported in the axial direction and is rotatably supported by an appropriate means (not shown).

A rotating member 60 that rotates integrally with the movable shaft 50 is attached near the end of the movable shaft 50 on the lid 30 side (upper side), and the upper end of the coil spring 40 is attached to the rotating member 60. It is fixed. Engagement protrusions 31, 31 are provided on the lower surface of the lid 30. These engaging projections 31, 31 are engaged with the rotating member 60 with a play area of 90 degrees or more in terms of rotation angle, for example. That is, when the positions of the engaging protrusions 31 and 31 are fixed, the rotating member 60 can freely rotate within a predetermined angle range of 90 degrees or more from the position where the engaging protrusion 31 is regulated. ing.

Therefore, when the lid 30 is rotated in the winding direction of the coil spring 40 (right-handed direction in the illustrated example) from the position where the engaging protrusion 31 hits the rotating member 60, the lid 30 is pushed and rotated by the engaging protrusion 31. The member 60 rotates, and accordingly, the coil spring 40 is twisted in the winding direction, and an initial biasing force (setting force) for returning to the coil spring 40 in the unwinding direction (left direction) is applied. From the position, the rotating member 60, that is, the movable shaft 50 can be rotated clockwise in the range of a predetermined angle. In this example, the lid 30 is fixed to the case main body 10 in a state of being rotated by a half turn, so that the coil spring 40 in the free state is preliminarily twisted by a half turn, so that the initial biasing force is increased. The movable shaft 50 is rotated against the coil spring 40 based on the position of the movable shaft 50.

Further, inside the case main body 10, a cylindrical movable cylinder (movable body) 61 is disposed in a space between the wall surface of the case main body 10 and the spring housing cylinder 20. .. The movable cylinder 20 is rotatably provided, and its cylindrical outer peripheral wall is close to the cylindrical inner peripheral wall of the case body 10 with a predetermined gap.

The upper end of the movable cylinder 61 is connected to the rotating member 60 via a spring one-way clutch 62. The structure of the spring one-way clutch 62 is the same as that described in, for example, Japanese Patent Application Laid-Open No. 2-292480, and therefore will not be described in detail here. When the rotating member 60 rotates in the winding direction (right direction) of the coil spring 40, the clutch 62 does not connect the rotating member 60 and the movable cylinder 61, and the rotating member 60 rewinds the coil spring 40 in the unwinding direction ( When turning in the left direction, the rotary member 60 and the movable cylinder 61 are connected.

A viscous fluid 100 is filled in the space between the case body 10 and the spring housing cylinder 20. Therefore, the movable cylinder 61 is rotatably moved in the viscous fluid 100 filled between the case body 10 and the spring housing cylinder 20. As shown in FIG. 1, the movable cylinder 61 is provided with a hole 63 penetrating the cylinder wall at an appropriate position, and when the movable cylinder 61 rotates, the movable cylinder 61 is moved by the shear resistance of the viscous fluid 100. Rotational resistance is added. This principle is the same as the conventional one.

In addition to the above-described configuration, the rotary damper of the present embodiment further includes an adjustable band 70 whose diameter can be expanded / contracted in the gap between the movable barrel 61 and the case body 10. The case body 10 is characterized in that an adjusting shaft (operating mechanism) 80 for expanding and contracting the adjusting band 70 is provided.

Hereinafter, this point will be described in detail with reference to FIGS. 1, 2, 4, and 5.

As shown in FIG. 1, the adjustment band 70 has a smaller height (width) than the height of the movable barrel 61, and the adjustment band 70 is located in the middle of the movable barrel 61 in the height direction. It is arranged so as to surround the outer circumference.

The adjusting band 70 has its bending ratio and length set appropriately so that it can surround the outer circumference of the movable cylinder 61, and as shown in FIG. 5, one end (hereinafter referred to as “fixed end”). ) 71 is bent outward, and the fixed end 71 is inserted and fixed in the engaging groove 86 of the block 85 provided on the side surface of the case body 10 as shown in FIG. Further, the other end (hereinafter, referred to as "movable end") 72 is rounded outward with an appropriate radius as shown in FIG.

On the other hand, as shown in FIG. 1, the adjustment shaft 80 is rotatably attached to an attachment hole 87 (see FIG. 2) of a block 85 fixed to the side surface of the case body 10. The adjustment shaft 80 is attached parallel to the axis of the case body 10, that is, with the axis oriented vertically, and as shown in FIG. 4B, has large-diameter portions 81 and 82 vertically. As shown in FIGS. 4 (a) and 4 (c), a plus groove for engaging the tip of a Phillips screwdriver is formed on the end surface of each large diameter portion 81, 82. The adjusting shaft 80 can be rotated appropriately by the.

In addition, between the upper and lower large diameter portions 81 and 82 of the adjustment shaft 80, a small diameter eccentric pin portion 83 having a center axis decentered from the axes of the large diameter portions 81 and 82 is shown in FIG. It is formed as shown. Support shafts 84a, 84b for rotatably attaching the adjusting shaft 80 to the block 85 so as not to come off in the axial direction are formed at appropriate positions of the large diameter parts 81, 82. There is.

The adjustment shaft 80 is rotatably attached to the block 85 by the support shaft portions 84 a and 84 b, and as shown in FIG. 2, the eccentric pin portion 83 of the adjustment shaft 80 is attached to the adjustment band 70. The movable end 72 is locked. As a result, by appropriately turning the adjusting shaft 80, the eccentric pin portion 83 rotates eccentrically around the axis of the adjusting shaft 80, thereby pulling or loosening the movable end 72 of the adjusting band 70. The operation causes the adjustment band 70 to contract or expand in diameter. As shown in FIG. 1, the adjustment band 70 is provided with a large number of slits 73 penetrating its wall surface at appropriate intervals, so that the viscous fluid is well spread inside the adjustment band 70. There is.

Next, the operation will be described. In this rotary damper, when fixing the lid 30 to the case main body 10, the lid 30 is fixed by rotating clockwise for a half turn. As a result, the coil spring 40 is set in a state in which it has been twisted by a half circumference, and the return force (counterclockwise) is already applied to the movable shaft 50 in the initial set state. Since the manner of mounting the rotary damper is the same as the conventional one, it will not be described in particular. Then, in such an attachment mode, when the door is opened from the closed state, the movable shaft 50 and the rotating member 60 turn to the right against the urging force of the coil spring 40 (see FIG. 3). At that time, the spring one-way clutch 62 is disengaged, and the movable cylinder 61 is in a non-connection relationship with the movable shaft 50. Therefore, the movable cylinder 61 does not rotate, the viscous resistance force is not generated, and the door receives only the resistance force by the restoring force of the coil spring 40.

Next, when the door is released with an appropriate opening, the force of the coil spring 40 causes the movable shaft 50 to return to the left and rotate. At this time, the spring one-way clutch 62 is brought into the connected state, and the movable barrel 61 rotates integrally with the rotating member 60 together with the movable shaft 50. Then, as the movable cylinder 61 rotates, viscous shearing force acts and rotation resistance is generated. Therefore, the return rotation by the coil spring 40 is braked, and the door slowly returns to the closing direction. The operation up to this point is the same as the conventional one.

Now, in the case of adjusting the braking force at the time of the return rotation as described above, that is, the degree of the cushioning effect, it is performed as follows.

First, a plus driver is prepared. Then, the adjusting shaft 70 is slightly rotated within a half circumference with a Phillips screwdriver. At this time, the position of the eccentric pin portion 83 rotates eccentrically around the axis of the adjustment shaft 80 according to the rotational position of the adjustment shaft 80. This causes the movable end 72 of the adjustment band 80 to be pulled or loosened, resulting in the adjustment band 70 contracting or expanding in diameter.

When the diameter of the adjustment band 70 is reduced, the clearance between the movable barrel 61 and the adjustment band 70 is reduced, and the clearance between the inner peripheral wall of the case body 10 and the movable barrel 61 is substantially reduced. As a result, the shear resistance of the viscous fluid increases. Further, depending on the degree of diameter reduction, the adjustment band 70 directly comes into pressure contact with the outer peripheral wall of the movable barrel 61, so that the frictional resistance is also added and the rotational resistance of the movable barrel 61 increases significantly. As a result, the rotational speed of the movable shaft 50 increases, and the buffer speed becomes slow.

On the other hand, when the diameter of the adjustment band 70 is increased, the clearance between the movable cylinder 61 and the adjustment band 70 is increased, and the clearance between the inner peripheral wall of the case body 10 and the movable cylinder 61 is substantially increased. As a result, the shear resistance of the viscous fluid decreases, the rotational resistance of the movable cylinder 61 decreases, and the buffer speed increases.

As described above, the adjustment band 70 can be expanded or contracted by rotating the adjustment shaft 80 by an amount that is slightly less than half the circumference, and as a result, the degree of the braking force of the damper can be increased. Can be easily adjusted. At this time, since the adjusting shaft 70 extends in the vertical direction, the buffer speed can be adjusted only by operating the driver from below or from above. Therefore, it is easy to operate and excellent in practicality.

If a mark is provided on the end face of the adjustment shaft 80 and a scale is provided on the end face of the block 85, the rotation position of the adjustment shaft 80 can be easily known from the outside. From the positional relationship, it is possible to know the current strength of the braking force.

[0031]

[Effect of the device]

 As described above, according to the rotary damper of the present invention, by expanding or contracting the adjustment band, it is possible to easily change the rotational resistance and adjust the buffer speed, which is excellent in practicality. ing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same main part.

FIG. 3 is a vertical cross-sectional view showing the principle structure of the damper of the embodiment.

FIG. 4 shows a configuration of an adjusting shaft 80 used in the embodiment,
(A) is a top view, (b) is a side view, (c) is a bottom view,
(D) is a sectional view taken along the line IVd-IVd in FIG.

FIG. 5 is a plan view of an adjustment band 70 used in the embodiment.

[Explanation of symbols]

 10 Case Main Body 20 Spring Storage Cylinder 30 Lid 40 Coil Spring 50 Movable Shaft 60 Rotating Member 61 Movable Cylinder 62 Spring One-way Clutch 70 Adjustment Band 71 One End (Fixed End) 72 Other End (Moveable End) 80 Adjustment Shaft (Operating Mechanism) 83 Eccentric Pin Part 100 Viscous fluid

Claims (1)

[Scope of utility model registration request] 1. A movable body is rotatably housed inside a cylindrical case, and a cylindrical outer peripheral wall of the movable body is brought close to a cylindrical inner peripheral wall of the case with a minute gap, and In a rotary damper that generates a resistance force in the rotational direction between the case and the movable body by the shear resistance of the viscous fluid that is interposed, it is possible to expand and contract the diameter in the gap between the case and the movable body. A rotary damper, characterized in that an adjusting band is inserted to fix the adjusting band to the case, and a mechanism for expanding and contracting the adjusting band is provided in the case.