JP2001140530A - Door cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door cushion capable of preventing abrupt closing of a door by effectively utilizing the compression of pneumatic pressure in a cylinder without necessitating such precision machining that allows an inner cylinder to be inserted into an outer cylinder tightly. SOLUTION: This door cushion is constituted in such a way that an inner cylinder 9 is inserted into an outer cylinder 1 provided with a small hole 3 on a bottom wall 2 so as to advance and come out freely, one end of the inner cylinder 9 is in the outer cylinder 1 and the other end thereof protrudes from the outer cylinder 1, a packing 11 which is pressed against and comes into contact with inner periphery of the outer cylinder 1 is provided in an end part of the inner cylinder 9 in the outer cylinder 1, a cushion material 15 is provided in an end part of the inner cylinder 9 protruding from the outer cylinder 1, and a spring 10 energizing in the direction in which the inner cylinder 9 protrudes is provided in the outer cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a door cushion for preventing a door from closing suddenly.

[0002]

2. Description of the Related Art When a door is closed vigorously or when the door is suddenly closed by a strong wind, the door collides with a door frame and emits a banging sound. There is a risk of injuries between fingers and hands.

In order to avoid the above-mentioned danger, for example, Japanese Utility Model Laid-Open Publication No. 55-19725 proposes a door toe utilizing the outflow resistance of air.

FIG. 4 is a cross-sectional view of a conventional door rest utilizing the outflow resistance of the air.
A spring 24 is inserted between the inner cylinders 23 that fit exactly inside. When the door is about to close rapidly, the resistance of the air flowing out of the small hole 22 is large, so that the pressure of the air in the outer cylinder 21 increases and the door can be prevented from closing rapidly. . The spring 2
Reference numeral 4 is for returning the inner cylinder 23 to the standby position when the door is opened.

[0005]

However, in the above-mentioned door-to-door system utilizing the resistance to outflow of air, the dimensional accuracy in the inner cylinder and the outer cylinder is increased in order to make the inner cylinder fit into the outer cylinder exactly. Since it must be precision processed, it takes time to process. Even if the inner cylinder is precisely finished so that it can move inside the outer cylinder, when the door is about to close rapidly, not only does air flow out of the small hole, but also the gap between the outer cylinder and the inner cylinder in the cylinder. Since air flows out from the gap, the air pressure cannot be fully utilized, and there is no effect of preventing sudden closing.

Accordingly, the present invention provides a door cushion utilizing the outflow resistance of air by an inner cylinder and an outer cylinder having a small hole, without the need for precise processing to fit the inner cylinder into the outer cylinder. It is an object of the present invention to provide a door cushion which can prevent a door from closing suddenly by effectively utilizing the compression of the air pressure inside the door.

[0007]

According to the door cushion of the present invention, the inner cylinder is inserted into the outer cylinder having a small hole in the bottom wall so as to be able to advance and enter into the outer cylinder. Are protruded from the outer cylinder, and a packing is provided at the end of the inner cylinder in the outer cylinder to press and contact the inner periphery of the outer cylinder, and a cushion material is provided at an end of the inner cylinder protruding from the outer cylinder. Is provided with a spring for biasing the inner cylinder in a direction to protrude.

[0008]

FIG. 1 is a sectional view of a door cushion according to the present invention, FIG. 2 is an exploded view of an inner cylinder, and FIG. 3 is an exploded view of a door cushion of the present invention.

One end of the outer cylinder 1 is closed by a bottom wall 2, and a small hole 3 penetrating the bottom wall 2 is formed in the center of the bottom wall 2. Outside the outer cylinder 1, two mounting plates 5a and 5b having screw holes 4 are formed at right angles to mount the door cushion on the door frame. The door cushion may be attached to the door frame by using an adhesive instead of screws. Outer cylinder 1
Has a fixing hole 8 for fitting and fixing the fixing pin 7 of the lid 6.
Is provided.

An inner cylinder 9 is inserted into the outer cylinder 1 so as to be able to enter and exit. There is no need to make the interval between the inner circumference of the outer cylinder and the outer circumference of the inner cylinder such that the inner cylinder 9 fits exactly into the outer cylinder 1.
An interval that can be inserted loosely is sufficient. The inner cylinder 9 includes a spring 10 provided between the bottom wall 2 of the outer cylinder 1 and an end of the inner cylinder 9 in the outer cylinder.
Thus, one end is located inside the outer cylinder 1 and the other end is arranged to protrude from the outer cylinder 1.

At the end of the inner cylinder 9 inside the outer cylinder 1, there is provided an annular packing 11 which presses the inner periphery of the outer cylinder 1 and makes contact therewith. The packing 11 is fitted and fixed by an inner peripheral ridge 12 and an annular groove 13 provided at an end of the inner cylinder.

At the end of the inner cylinder 9 inside the outer cylinder, a convex stopper 14 is formed on the outer periphery thereof.
Reference numeral 4 denotes the lid 6 so that the inner cylinder 9 does not come off from the outer cylinder 1.

A cushion member 15 is attached to an end of the inner cylinder 9 protruding outside the outer cylinder 1. Mounting is
Although it is fitted and fixed by the inner peripheral ridge 16 and the annular groove 17 provided at the end of the inner cylinder, an adhesive may be used. As the cushion material 15, a synthetic rubber is suitable for sound insulation when a door collides.

Next, the operation of the door cushion of the present invention will be described.

When the door is closed, the cushion 15
However, since the cushion material 15 is made of rubber, no loud collision noise is generated. Thereafter, as the door closes, the inner cylinder 9 is pushed into the outer cylinder 1 and the air in the outer cylinder 1 is compressed. Since the gap formed between the inner cylinder 9 and the inner cylinder 9 is in pressure contact with the inner periphery of the outer cylinder 1 by the packing 11 attached to the inner cylinder 9, air does not escape from the gap, and air gradually flows only from the small holes 3. The door does not close suddenly.

In the case of a shutter door that is moved up and down,
By providing two door cushions on the left and right at the top of the door frame, a sound insulation effect can be obtained.

[0017]

According to the present invention, the packing is provided at the end of the inner cylinder in the outer cylinder so as to press and contact the inner periphery of the outer cylinder. Can be prevented from closing, and since there is no need for precision machining such that the inner cylinder fits exactly into the outer cylinder, the labor of machining can be saved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a door cushion of the present invention.

FIG. 2 is an exploded view of the inner cylinder.

FIG. 3 is an exploded view of the door cushion of the present invention.

FIG. 4 is a cross-sectional view of a conventional door rest utilizing the outflow resistance of air.

[Explanation of symbols]

 1: outer cylinder 2: bottom wall 3: small hole 4: screw hole 5a, 5b: mounting plate 6: lid 7: fixing pin 8: fixing hole 9: inner cylinder 10: spring 11: packing 12: inner peripheral ridge 13: Annular groove 14: Stopper 15: Cushion material 16: Inner peripheral ridge 17: Annular groove 21: Outer cylinder 22: Small hole 23: Inner cylinder 24: Spring

Claims (1)

[Claims] 1. An inner cylinder is inserted into an outer cylinder having a small hole formed in a bottom wall so as to freely enter and exit, and the inner cylinder has one end inside the outer cylinder and the other end protruding from the outer cylinder, and is inside the outer cylinder. A packing is provided at the end of the inner cylinder in pressure contact with the inner periphery of the outer cylinder, and a cushioning material is provided at the end of the inner cylinder protruding from the outer cylinder, and biases the inner cylinder into the outer cylinder in a protruding direction. A door cushion comprising a spring.