JPS633013Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a damper that dampens the movement of a cassette holder and softens the movement when operating a device that is rotated or pulled out, such as the cassette holder of a cassette tape recorder. It is something.

A damper used in this type of device obtains a desired damping effect by controlling the amount of air flowing in and out of an air chamber formed by a cylinder and a piston that reciprocates within the cylinder.

We have previously proposed such dampers as shown in FIGS. 1a and 1b.

That is, FIGS. 1a and 1b are a side view and an enlarged bottom view of the cylinder portion of the damper.

In this figure, 1 is a cassette, 2 is a cassette holder into which the cassette 1 is inserted, 3 is a spindle around which the cassette holder 2 rotates, 4 is a spindle provided on the cassette holder 2, and the operating rod 5 is engaged. Reference numeral 6 denotes an operating rod, which is connected to the operating rod 5 in an appropriate manner. A piston 7 is surrounded by an O-ring 8, which is an elastic ring, and is tightly fitted into a cylinder 9. 10 is an air chamber formed by the piston 7 and the cylinder 9; 11 is a hole formed in the bottom of the cylinder 9; 12 is a groove formed in the bottom surface 9a of the cylinder 9; the cross-sectional area of the hole 11 is This groove is formed to have a smaller cross-sectional area than 1.
The braking effect is adjusted appropriately depending on the size of the cross-sectional area. 13 are holes 11 and grooves 12 in the bottom surface 9a.
It is a sealing member that covers a part of the

Next, the operation will be explained.

When the cassette 1 is placed in the cassette holder 2, the cassette holder 2 is rotated around the support shaft 3 by a mechanism not shown, and the operation rod 5, which engages with the support shaft 4 of the cassette holder 2, presses the operating rod 6. , whereby the piston 7 is tightly fitted into the cylinder 9 with the O-ring 8.
is moved to the right in Figure 1a. At this time, the air in the air chamber 10 passes through the hole 11 and the groove 12 and is discharged to the outside of the cylinder 9. In this way, the braking effect is obtained.

Similarly, during the reverse operation, the braking effect is obtained by the air passing through the grooves 12 and holes 11 and flowing into the air chamber 10.

However, since it is difficult to integrally form a small hole 11 when forming the cylinder 9, the groove 1 has a smaller cross-sectional area than the hole 11 formed in the cylinder 9.
2, and by covering this groove 12 with a sealing member 13, there was a drawback that an air passage with a small cross-sectional area had to be formed.

This invention was made in order to improve the above-mentioned drawbacks, and the elastic ring is interlocked with the movement of the piston to automatically change the size of the passage to perform a braking action. This invention will be explained below based on the drawings.

Figures 2a, b, c, and d show an embodiment of this invention, and are a side view of the cylinder portion of the damper cut away, a plan view of the opposing first and second flanges, and an enlarged sectional view of the piston.

In this figure, 20 is a piston that connects a first flange 21, a rib 22 provided on this first flange 21, a second flange 23, and these first and second flanges 21, 23. The connecting portion 24 has a truncated conical shape. and,
The first flange 21 includes a first flange 21
and a passage 25 formed by the ribs 22, and the second flange 23 is provided with a groove continuous from the connecting portion 24 to the second flange 23, thereby forming a passage 26. The minimum cross-sectional area of the groove of this passage 26 is set to produce the desired damping effect. Reference numeral 27 is an operating rod, and 28 is an O-ring which is an elastic ring, and is arranged at the connecting portion 24 between the first and second flanges 21 and 23. 29 is a cylinder, 30 is the piston 2
0 and the cylinder 29.
The outer diameters of the first and second flanges 21 and 23 are slightly smaller than the inner diameter of the cylinder 29 to create a gap, through which air can enter and exit between them, and the O-ring The outer diameter of the cylinder 28 is set larger than the inner diameter of the cylinder 29.

Next, the operation will be explained.

When the piston 20 is inserted into the cylinder 29 by the operating rod 27, that is, when the piston 20 moves in the direction of the solid arrow A in FIG. 29, but the first
When the flange 21 moves, the O-ring 28 comes into contact with the rib 22, and from then on, the first flange 21 and the O-ring 28 move as one. At this time, the air in the air chamber 30 flows through the second and first flanges 2.
The piston 20 is discharged through the route of the passages 26 and 25 passing through the outer peripheries of the pistons 3 and 21, and the piston 20 is inserted into the cylinder 29. Therefore, air passes through relatively easily and does not require much braking.

Next, when the piston 20 moves in the reverse direction, that is, in the direction of the broken line arrow B in FIG.
The ring 28 is locked to the inner wall of the cylinder 29, but when the second flange 23 moves, the O-ring 28 is guided by the truncated conical connecting part 24, and the O-ring 28 is locked to the inner wall of the cylinder 29. The O-ring 28 and the cylinder 2 are in contact with the surface as shown by the broken line in FIG.
The inner wall of 9 is sealed by the tapered portion of the connecting portion 24 to prevent air from flowing therethrough. After that, the second flange 23
and O-ring 28 move together. At this time, the air passes through the outer periphery of the first flange 21,
The passage 26 formed by the groove that is not interrupted by the second flange 23 and the O-ring 28 is shown in FIG.
It passes through as indicated by the broken line arrow and flows into the air chamber 30. The braking effect of this air inflow varies depending on the size of the cross-sectional area of the passage 26.

Note that if the ribs 22 and passages 25, 26 provided on the first and second flanges 21, 23 are formed in opposite directions, the braking effect can be provided in opposite directions. It goes without saying that it can be done.

As explained above, according to the damper of this invention, since the ribs and grooves are formed on the piston, the ribs and grooves can be easily molded integrally with synthetic resin, so no processing or parts are required on the cylinder. It is possible to perform braking action only in one direction without any problems. Therefore, the number of manufacturing steps can be reduced and manufacturing can be done at low cost. Furthermore, since no sealing material is used, the material of the cylinder is not limited.
For example, Delrin, which cannot be pasted with tape, can also be used as a material. Since Delrin is a material that is outsert to the substrate, it has the advantage that the cylinder can be manufactured integrally with the substrate by outsert.

[Brief explanation of drawings]

Figures 1a and b are a cutaway side view and bottom enlarged view of the cylinder part of the previously proposed damper, and Figure 2a,
b, c, and d are a side view of an embodiment of the invention with the cylinder portion cut away, a plan view of the first and second flanges facing each other, and an enlarged sectional view of the piston. In the figure, 20 is a piston, 21 is a first flange, 22 is a rib, 23 is a second flange, 24 is a connecting portion, 25 and 26 are passages, 28 is an O-ring, 2
9 is a cylinder.

Claims (1)

[Scope of utility model registration request] A first flange and a second flange are provided on a piston that reciprocates within a cylinder, and the first flange and second flange are integrally connected by a truncated conical connecting portion, and this truncated conical connecting portion is provided with a first flange and a second flange. A continuous groove is provided in the plane of the flange and the second flange, and an elastic ring is disposed in the truncated conical connecting part, and when the piston is moved from the first flange toward the second flange, the groove is connected to the groove. A damper that allows gas to escape.