JPH0623785Y2 - Air damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an air damper used to obtain a cushioning effect (deceleration effect) in various electronic and electric devices.

[Conventional technology]

As an air damper used for the above purpose, a combination of a cylindrical cylinder and a piston having a circular cross section that slides in the cylinder is often used.

[Problems to be solved by the device]

However, when it is necessary to save space, an air damper consisting of a combination of this cylindrical cylinder and a piston with a circular cross-section, if the outer diameter is made smaller, its buffering force is proportional to the cross-sectional area, so an appropriate buffering force is required. Couldn't get

SUMMARY OF THE INVENTION An object of the present invention is to provide an air damper, which is improved from the above-mentioned drawbacks of the conventional air damper and can obtain an appropriate cushioning force even when it is necessary to save space.

[Means for Solving the Problems]

The present invention adopts the following configuration in order to achieve the object.

In other words, it is composed of a combination of a piston with an oval cross section and a cylinder that slides the piston inside, and an elliptical circumferential groove with a reduced diameter is provided near the insertion end of the piston. It has a seal inserted.

[Action]

Since the present invention has the above-described structure, even if the mounting space is small and the diameter needs to be small, the cross-sectional area of the piston can be increased by making the cross-sectional shape of the piston oval.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. FIG. 2 is a front view showing a usage state of the embodiment of the present invention, and FIG. 3 is a sectional view taken along the line AA of FIG.

In FIG. 1, 1 is an oval cylindrical cylinder,
The closed end 2 is provided with a mounting portion 4 having a mounting hole 3 for mounting to a mounting plate 22 (see FIG. 3) such as a chassis. At the open end 23 of the cylinder 1, a notch 7 for sliding a head portion 6 of an actuating rod 5 which will be described later and the actuating rod 5 is prevented from jumping out of the cylinder 1 by the repulsive force of a compression spring 8 which will be described later. Locking steps 9, 9 are provided for blocking. An operating rod 5 that slides in the axial direction is inserted in the cylinder 1.

A piston 10 having an oval cross section is provided at the insertion end of the actuating rod 5, and an elliptical circumferential groove 12 having a diameter reduced toward the exposed end 11 side is formed in the circumferential groove 12. A piston seal 13 having an inverted V-shaped cross section which is an elastic body is fitted therein. The piston seal 13 is of a type that promptly sucks the outside air. On the inner surface of the operating rod 5, a hollow portion 14 (see FIG. 3) is provided which is open on the piston 10 side and closed at the other end in the middle of the operating rod 5, and a spring provided inside the hollow portion 14 and the cylinder 1. seat
The compression spring 8 is attached between the compression springs 15 and 15. The hollow portion 14
A small-diameter air hole 17 (see FIG. 3) for inhaling / exhausting (connecting to the outside air) is provided at the closed end 16 of the, and an exhaust volume adjusting screw 18 is screwed into the air hole 17 for easy operation. It constitutes the speed adjustment mechanism. In the vicinity of the exposed end 11 of the actuation rod 5, a head 6 with which an arm 21 (see FIG. 2) provided on a member (for example, an opening / closing part of a door of a cassette deck) that needs to obtain a deceleration operation comes into contact, Engagement piece 1 that is locked to the locking stage of the cylinder 1
9 and 19 are provided.

Next, how to use the air damper according to the embodiment of the present invention will be described. The operating rod 5 shown in FIG. 3 is in the projecting position by the repulsive force of the compression spring 8 when no force is applied by the arm 21. When the arm 21 rotates and a force pressing the head 6 of the operating rod 5 from the arm 21 is applied, the operating rod 5 is pushed into the cylinder 1 against the repulsive force of the compression spring 8. Since the exhaust air from the air hole 17 is extremely gentle, the pushing operation of the actuating rod 5 is delayed and a deceleration effect is produced, so that the force of the arm 21 to rotate is attenuated. When the force to rotate the arm 21 disappears, the repulsive force of the compression spring 8 causes the operating rod 5 to return to its original overhanging position, but only the air flows in from the gap between the air hole 17 and the adjusting screw 18. Instead, the air chamber 20 is communicated with the opposite side of the insertion end of the piston 10 by the piston seal having an inverted V-shaped cross section, and the air flows into the air chamber 20 through this gap, so that a smooth return ( Overhang motion) can be performed.

〔effect〕

Since the present invention is configured as described above, it has the following effects.

According to the air damper of the first aspect, even when the mounting space is small and the diameter needs to be small, since the cross-sectional area can be increased, an appropriate cushioning force can be obtained.

In the air damper according to the second aspect of the present invention, the piston seal is formed in an inverted V-shape in cross section, so that a cushioning force is obtained in one operation when the piston reciprocates (pushing operation and overhanging operation), and the other operation is buffered. Since the force can be reduced and smooth movement can be obtained, it can be used when it is desired to obtain a cushioning force only for a necessary operation.

In the air damper of the third aspect, since the screw for adjusting the exhaust amount is provided inside the actuation rod, the outer shape of the cylinder is not enlarged, so that the space can be saved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. FIG. 2 is a front view showing a usage state of the embodiment of the present invention, and FIG. 3 is a sectional view taken along the line AA of FIG. 1 is a cylinder, 5 is an operating rod, 6 is a head, 8 is a compression spring, 9 is a locking step, 10 is a piston 12, a circumferential groove, 13 is a piston seal 14, a hollow part, 15 is a spring seat 17 is an air hole, 18 Is an adjusting screw 19 is an engaging piece, 20 is an air chamber

Claims (3)

[Scope of utility model registration request] 1. A combination of a piston having an oval cross-section and a cylinder for sliding the piston inward, wherein a circumferential groove having a reduced diameter is provided near the insertion end of the piston. An air damper with a piston seal fitted in the groove. 2. The air damper according to claim 1, wherein the piston seal has an inverted V-shaped cross section. 3. An operating rod having a piston at its insertion end is provided with a hollow portion having an opening at the insertion end side and the other end closed midway along the operating rod, and the hollow portion and a spring seat provided on the cylinder are provided. A compression spring is attached between them, a small-diameter air hole that communicates with the outside air is provided at the closed end of the hollow part, and an exhaust volume adjusting screw is provided in the air hole, and the repulsive force of the compression spring causes the operating rod to move from the cylinder. An air damper that is equipped with hand-holding so as not to pop out.