JPS592342Y2 - shock absorber - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shock absorber designed to protect a seal ring attached to the outer periphery of a piston.

For example, it is desirable that a lid provided on a cassette loading section of a cassette tape recorder be opened slowly.

Therefore, in the past, the lid was always biased in the open direction using a spring, and a shock absorber made of a cylinder and a piston was installed between the lid and a suitable fixed part (for example, the chassis). .

In this case, a seal ring is usually attached to the outer circumference of the piston to enhance the sealing effect between the piston and the cylinder, but the ring may stick to the inner circumference of the cylinder while the piston is stationary. This may prevent the piston from starting its operation, and the seal ring may become deformed, requiring frequent replacement.

This invention was developed based on these circumstances.
The purpose of this is to prevent the seal ring from sticking to the inner circumferential surface of the cylinder while the piston is stationary in a shock absorber that has a seal ring attached to the outer circumference of the piston to enhance the sealing effect between the piston and the cylinder. The purpose of this invention is to prevent the piston from starting its operation smoothly, and also to prevent deformation of the seal ring and extend its life.

Hereinafter, the configuration of the present invention will be explained based on illustrated embodiments.

In the figure, 1 is a cylindrical cylinder, and 2 is a piston, one end of which is inserted into the china adder 1 so that it can move forward and backward.

The piston 2 has a cross-shaped cross section except for one end (see FIG. 2), has an annular groove 3 on the outer periphery of one end, and has a flange 4 abutting the end surface of the cylinder 1 on the other end. In addition to regulating the amount of inward movement, a mounting piece 5 having a hole 5a in the center projects from the outer surface of the flange 4.

An elastic seal ring (O-ring) 6 having a circular cross section is mounted in the annular groove 3, and the seal ring 6 is brought into close contact with the inner circumferential surface of the cylinder 1.

The cylinder 1 has a tapered screw 7 formed on its inner periphery at one end, into which a tapered plug 8 is screwed.

Further, the peripheral wall near one end has a ventilation hole 9, and an endless rubber band 10 is provided around the outer circumference of the cylinder 1 to close the ventilation hole 9.
is installed.

Further, cylindrical parts 11a for mounting are provided on both ends of the outer circumference of the cylinder 1,
11b is provided protrudingly.

Note that the vent hole 9 is located at a position where it is not blocked by the piston 2 even when the piston 2 moves inwardly.

The inner periphery of the cylinder 1 has a particularly large diameter in only a portion of the portion following the tapered screw 7, so that the seal ring 6 is located within the large diameter portion 12 when the piston 2 moves inwardly. It has become.

Therefore, in order to use this shock absorbing device, for example, to slowly open the lid of the cassette loading section of a cassette type tape recorder, one of the mounting cylindrical portions 11 a of the cylinder 1 is used.
It is sufficient to hingely connect the screw to the chassis of the tape recorder, and to hingely connect the mounting piece 5 of the screw 2 to the lid of the cassette unit.

In this way, the screws 1 to 3 move outward when the lid is opened, and move inward when the lid is closed.

When piston 2 moves outward, cylinder 1
Since the inside is completely sealed, the movement of the piston 2 is slow, and conversely, when the piston 2 moves inward, the air inside the cylinder 1 presses the rubber batid 10 from the inside and moves through the ventilation hole 9. Since the piston 2 is removed, the movement of the piston 2 is performed quickly.

In other words, the rubber band 10 functions as a check valve.

When the lid is closed, the piston 2 moves inwardly and remains stationary, and the seal ring 6 is connected to the large diameter portion 1 of the cylinder 1.
2, the seal ring 6 does not stick to the inner peripheral surface of the cylinder 1 and is not deformed.

Therefore, when the lid is opened, screws 1 and 2 can always smoothly start moving outward in the Jj direction, and since the life of the seal ring 6 is extended, there is no need to frequently replace it. do not have.

Note that when the plug 8 is loosened, the gap between the plug 8 and the taper head 7 increases, so that the speed at which the screw pin 2 moves outward can be increased.

As described above based on the embodiments, the shock absorber of the present invention has the inner periphery of the cylinder 1 having a large diameter at the - section, and when the piston 2 is at the rest position, the seal ring 6 is connected to the large diameter of the cylinder 1. Since the seal ring 6 is configured to be placed in the cylinder 1 inside the cylinder 1, it is possible to prevent the seal ring 6 from sticking to the inner circumferential surface of the cylinder 1 while the pips, I-:, and 2 are at rest. It is possible to smoothly start the operation of the screws and screws 2, and to prevent deformation of the seal ring 6.
It is possible to extend its lifespan.

Note that it is desirable that the diameter of the large diameter portion 12 of the cylinder 1 be set slightly larger than the outer diameter of the seal ring 6, but even if the diameter is the same as or slightly smaller than the outer diameter of the seal ring 6, other parts may If it is set larger, the pressure contact force between the seal ring 6 and the inner circumferential surface of the cylinder 1 will be weakened at the large diameter portion 12, so the seal ring 6 can be protected and the desired effect can be achieved. Obtainable.

In addition, the present invention is not limited to the configuration of the above embodiment,
Various modifications can be made.

For example, large diameter portions may be provided at two locations within the cylinder 1 so that the seal ring 6 is positioned within the large diameter portions even when the piston 2 is moved most outwardly.

Further, by storing a compression spring in the cylinder 1 and always urging the piston 2 in the vertical direction, a spring for opening the cassette loading lid can be omitted.

Also, as the screw ring 2 is moved inward, the air inside the cylinder 1 is compressed, or the seal ring 6 and the inner circumferential surface of the cylinder 1 are connected at the position where it should be most compressed. A gap will be created between the two, allowing air to leak,
Since this also functions as a check valve, it is possible to omit the check valve as in the above embodiment.

Furthermore, the present invention can be applied to various other applications other than the cassette loading lid.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■■■■■ in FIG. 1...Cylinder, 2...Piston, 6
... Seal ring, 12 ... Large diameter part.

Claims (1)

[Scope of utility model registration request] A cylinder whose inner periphery has a partially enlarged diameter, a piston inserted into the cylinder so as to be able to move forward and backward, and a piston which is attached to the outer periphery of the piston and is in sliding contact with the inner peripheral surface of the cylinder, and the piston is in a stationary position. and a seal ring located within the large diameter portion of the cylinder.