JPH053688U - Torque damper for opening and closing - Google Patents

Abstract

(57) [Abstract] [Purpose] To make a compact opening / closing torque damper that can be opened lightly when opening and closing an opening / closing member such as a lid and has a cushioning action when closed. A pair of cam disks 2 and 3 are provided inside the exterior body 1, and a flat elastic body such as a disc spring 4 that urges the cam portions 12 and 15 provided on the opposing surfaces of the outer disks 1 in a direction to mesh with each other. A shaft 5 which is housed and penetrates one of the cam disks 3 is fixed to the cam disk 3, and the cam disks 2 and 3 are axially separated from each other in a closed state of an opening / closing member attached integrally with the outer casing 1 or the shaft 5. The elastic body is compressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a torque damper used to limit the rotational torque of rotating parts such as opening / closing members of various devices.

[0002]

[Prior art and its problems]

 It is desirable that the opening / closing members such as the lids of various office equipment and the lids of toilet bowls are lifted lightly when they are opened by hand and closed without impact when they are closed, which is convenient and convenient.

Therefore, one end of the coil spring fitted around the rotating shaft is fixed to the fixed part and the other end is fixed to the movable part, so that when the lid is closed, the coil spring receives force in the winding direction and opens. It is known to sometimes receive force in the unwinding direction.

However, since the coil spring has a large shape in order to obtain a required spring force, it is not suitable for a small office equipment or the like.

Therefore, an object of the present invention is to provide a compact opening / closing torque damper by using a flat elastic body such as a disc spring.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention includes a pair of cam disks facing each other inside an annular outer casing, and a flat elastic member for pressing the pair of cam disks against one side wall of the outer casing. One cam board is fixed to the above-mentioned exterior body and a shaft that penetrates the cam board, and the other cam board is slidably housed in the axial direction. A cam portion having the same inclined surface is provided around the center, and both cam portions are engaged with each other.

[0007]

[Operation] Either one of the exterior body or the shaft is integrated with the opening / closing member such as the lid, and the other is integrated with the fixing member such as the casing. The cam portions of both cam disks are the farthest apart when the opening / closing member is closed, and the elastic member is in a compressed state. When the opening / closing member is opened from this state, the engagement between both cams gradually becomes deeper, and the cam disks approach each other due to the restoring elasticity of the elastic members.

On the contrary, when the opening / closing member is closed, the engagement of both cam portions becomes gradually shallower, the cam disks are separated from each other against the elastic force of the elastic member, and the elastic member is compressed.

[0009]

【Example】

 As shown in FIG. 1, the opening / closing torque damper comprises an outer casing 1, a pair of opposed cams 2, 3, a pair of disc springs 4, a shaft 5 and a pressing plate 6.

The outer casing 1 has an annular peripheral wall 7, one end of which is bent inward to form an end wall 8, and the other end is formed with an inward flange 9 narrower than this. Then, the pressing plate 6 is attached to the inside of the collar 9.

The pair of cam disks 2 and 3 are housed inside the exterior body 1 while being offset toward the collar 9 side. A shaft 5 is press-fitted in the center of one of the cam disks 2 and is integrated with the cam disk 2.

The outer peripheral surface of the cam disk 2 is formed in two steps of a large diameter portion 10 and a small diameter portion 11, the outer end surface on the large diameter portion 10 side contacts the restraining plate 6, and the large diameter portion 10 A cam portion 12 is formed on the inner end surface of 10.

The other cam disk 3 is fitted around the small diameter portion 11 with a required clearance. An axial groove 13 is formed on the outer peripheral surface of the cam board 3 (see FIG. 4), and a recess 14 of the exterior body 1 is fitted into the groove 13 to allow the exterior body 1 to slide in the axial direction. It is stored in. The cam portion 15 is also formed on the surface of the cam disk 3 facing the cam disk 2.

The respective cam portions 12 and 15 of both cam discs 2 and 3 are located at three equal positions around the centers of the cam discs 2 and 3 when facing the cam portions 12 and 15, respectively. Each of the formed cam parts 12 and 15 divided into three parts has an inclined surface that gradually increases in the counterclockwise direction, and the cam parts 12 and 15 on both sides are engaged with each other.

The slope of the inclined surface of each cam portion 12, 15 is set to be equal to or greater than the friction coefficient of the inclined surface.

A pair of disc springs 4 are fitted back to back on the outer periphery of the end of the small diameter portion 11 of the cam disk 2 with a gap. The disc spring 4 is interposed between the outer end surface of the cam disk 3 on the exterior body 1 side and the end wall 8 of the exterior body 1. Further, a recess 16 is formed on the outer peripheral portion of the disc spring 4 at a position corresponding to the groove 13 of the cam disk 3 (see FIG. 4), and the recess 14 of the outer casing 1 is engaged with this.

The opening / closing torque damper of the embodiment is as described above. For example, the shaft 5 is fixed to the main body of an office machine, the exterior body 1 is attached to the opening / closing lid, and the opening / closing lid is closed for use. In this state, the engagement between the cams 12 and 15 is the shallowest, so that the cam disk 3 is separated from the cam disk 2 and the space between them is maximized, and the disc spring 4 is compressed (see FIG. 3). .

When the lid is opened from this state, the outer casing 1 integrated with the lid and the one cam disk 3 and the disc spring 4 engaged with the outer casing 1 rotate together, and the cam portions 12, 15 are inclined to each other. Sliding in the downward direction, the engagement between the cam portions 12 and 15 becomes deeper. Therefore, the cam disk 3 is pushed by the restoring elastic force of the disc spring 4 and approaches the cam disk 2, and the lid is urged by the spring force of the disc spring 4 to be lightly opened.

Next, when the lid in the open state is closed, the engagement between the cam portions 12 and 15 gradually becomes shallower, and the cam disc 3 gradually separates in the axial direction while compressing the disc spring 4. For this reason, the lid is closed against the spring force of the disc spring 4 and at the same time buffered.

In the above embodiments, the shaft 5 is fixed to the main body, and the exterior body 1 is attached to the lid. On the contrary, the shaft 5 is attached to the lid, and the exterior body 1 is fixed to the main body. Good.

In the above embodiment, the cam portions 12 and 15 are provided at three equally divided positions, but they may be provided at two equally divided positions. Further, as the flat elastic body, the disc spring 4 is exemplified, but a flat leaf spring having a corrugated curved surface can also be used.

[0022]

[Effect of the device]

 As described above, according to the present invention, the rotation of the opening / closing member is converted into the axial movement by using the pair of cam disks, and the movement is received by the elastic body. Therefore, an elastic body that can obtain a large torque can be used. As a result, there is an effect that the entire structure can be made compact.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a side view of the same as the one omitted.

FIG. 3 is a sectional view of the same operating state as above.

FIG. 4 is a partially exploded perspective view of the above.

[Explanation of reference numerals] 1 exterior body 2, 3 cam board 4 disc spring 5 axis 6 restraining plate 7 peripheral wall 8 end wall 9 flange 10 large diameter part 11 small diameter part 12 cam part 13 groove 14 recess 15 cam part 16 recess

Claims (1)

[Claims for utility model registration] Claims: 1. A pair of cam discs facing each other inside the annular outer casing, and a flat elastic member for pressing the pair of cam discs to one side wall of the outer casing. One cam board is fixed to the exterior body and the shaft that penetrates the cam board, and the other cam board is slidably housed in the axial direction. A torque damper for opening and closing, in which a cam portion having the same inclined surface is provided on both sides and both cam portions are engaged with each other.