JPH0819991B2 - Shock absorber - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shock absorber configured so that an operating speed can be adjusted when opening / closing and closing a lid of an open / close storage box.

[Prior Art] As a shock absorber used as a prior art, for example, there is one disclosed in Japanese Patent Laid-Open No. 61-136029.

That is, as shown in FIG. 11, a cylinder having a sliding port 30 at which the piston rod can freely slide at one end and a rear wall 31 having a through hole 29 in the center at the other end is formed. In the inner diameter portion of the cylinder 20 of 20, a long piston rod is partially projected from the sliding port 30, and the first piston is provided on the rear wall 31 side.
A spring 25 that connects 22 and is directly connected to the rear wall 31 is fixed while the second piston 21 is always pressed.

An O-ring is wound around the outer circumference of the second piston 21, and an orifice 28 is formed in the wall of the cylinder 20 between the O-rings. Air from 28 flows into the first space 23 or the second space 24, which will be described later, to adjust the degree of buffering.

Further, other small orifices 26 and 27 are bored in the portion corresponding to the second space portion 24, and the cushioning degree is adjusted together with the orifice 28.

Further, the first space portion 23 in which the spring 25 is arranged absorbs the air movement from the through hole 29 due to the left and right movement of the second stone 21, and adjusts the negative pressure of the air. .

[Problems to be Solved by the Invention] However, in such a conventional shock absorber, as shown in the drawing, air from the orifices 26 and 27 is caused by the presence of the first and second pistons 21 and 22, respectively. Therefore, the cylinder 20 requires a plurality of orifices as described above, and a spring 25 for holding the second piston 21 at a constant position is arranged in the cylinder 20. There was a need to install.

In such a structure, the number of parts inevitably increases, the number of assembling steps increases, and the cost tends to increase.

In addition, the dimensional accuracy of the orifice itself and the accuracy of the position where the orifice is formed in the cylinder are required, and this determines the quality of the cylinder.

[Means for Solving Problems] The present invention was developed in order to effectively solve the problems of the conventional shock absorber according to the present invention. One end of the opening allows the piston rod to freely slide. A cylinder having a mouth and a rear wall having a through hole in the center at the other end, in which the long piston rod is partially protruded from the opening in the inner diameter of the cylinder. By connecting a piston to the rear wall side and forming a moving space portion in the buffer portion formed on the outer side portion of the rear wall, the air pressure sucked and discharged from the through hole is made constant. (EN) A shock absorber in which a valve made of an elastic body and having an orifice so as to be held is disposed in the moving space.

[Operation] In the shock absorber according to the present invention, the air pressure generated by the operation of the piston is connected to the outside of the cylinder to form a shock absorbing portion.
Since the soft material valve is provided to buffer the operation of the piston, the soft material valve adjusts its air pressure through its own orifice even if the piston operating speed is suddenly or slowly operated. The piston operation can be made constant, the operation sound can be absorbed by the elasticity of its own material, and the sliding performance can be improved.

Embodiment An embodiment of the shock absorber according to the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 to 4, the shock absorber 1 according to this embodiment has an opening 7 formed at one end to allow the piston rod 4 to freely slide, and a central portion at the other end. A cylinder 2 having a rear wall 5 having a through hole 6 formed in
In the inner diameter portion of the cylinder 2, the long piston rod 4 partially protrudes from the opening 7, and the piston 3 is connected to the rear wall 5 side and is formed on the outer portion of the rear wall 5. A valve 12 which allows air to flow by forming an orifice 13 is provided in the buffer portion 10 so that the air pressure can be adjusted by holding the moving space portion 11.

That is, the piston 3 is fitted into the inner diameter of the cylindrical cylinder 2 through the O-ring 9, and the piston rod 4 is fitted and connected to the piston 3 in the axial direction of the cylinder 2, and the opening 7 The free tip is more protruding.

At the inner diameter of the cylinder 2, a space 8 is formed between the rear wall 5 and the piston 3. Further, the rear wall 5 is provided with a through hole 6 at an appropriate size in its central portion, and a buffer portion 10 is formed on the outer side of the rear wall 5.

FIG. 2 is an enlarged view of the main part of the shock absorber 1 shown in FIG. 1, and shows the relationship between the shock absorber 10 and the piston 3.

That is, the buffer portion 10 is formed on the outer surface of the rear wall 5 and is composed of a frame body of the buffer portion 10. The frame body is a cylindrical body, and the outer surface 15 has the outer surface as shown in FIG. An air vent hole 14 is provided, and a slide hole that is partially enlarged in the four directions of the vent hole 14.
16 and 16 are drilled at the same size intervals.

A valve 12, which is made of a soft material, for example, a soft rubber material, is inserted in the buffer portion 10 in a state where the moving space portion 11 is formed, and the orifice 13 is provided at the center of the valve 12. Are arranged so as to come into contact with the central position of the through hole 6.

The moving space portion 11 is a clearance for allowing the valve 12 to fit loosely by receiving the air pressure from the through hole 6 inside the buffer portion 10. The movement of the piston 3 inside the cylinder 2 can be adjusted. The slide hole 16 forms a slight gap with the valve 12 by the movement of the valve 12 by the air pressure, and forms a substantial escape path for air.

3 is a sectional view of the piston rod 4 taken along the line AA shown in FIG.

The usage state of the shock absorber 1 having such a configuration will be described with reference to the drawings shown below.

First, the shock absorber 1 is used by fixing the tip end of the piston rod 4 to the side surface of an open / close storage box (not shown) and fixing the cylinder 2 to another wall surface. In the closed state, the piston 3 is housed inside the cylinder 2 as shown in FIG. 1, and the space portions 8 are inserted at a narrow interval.

Then, when the above-mentioned open / close storage box slowly moves in the opening direction, the piston rod 4 also synchronizes and slowly slides while enlarging the space portion 8 as shown in FIG.

At this time, the air in the space 8 is in a negative pressure state,
Due to the presence of the orifice 13 of the valve 12, a certain amount of air is absorbed from the hole of the through hole 6 into the space 8 to adjust the moving speed of the piston, as shown in a partially enlarged sectional view of FIG. .

Here, since the valve 12 is molded from a soft material such as rubber, it easily abuts on the rear wall 5 and at the same time adheres thereto. Therefore, it has the function of keeping the flow of air at a constant level.

This flow rate is the same as the air rate when the piston 3 slides slowly, but when the piston 3 abruptly moves according to FIG. 5 and the space 8 abruptly expands, the valve 12 Will adhere more strongly and rely on only the orifice 13 for the amount of air flow, so that the moving force of the piston 3 is resisted and the moving speed becomes slow.

Next, when the open / close storage box is closed, the piston rods connected to the open / close storage box are automatically pressed, so that the piston 3 moves into the cylinder 2.

That is, as shown in FIG. 7, the piston 3 is slowly pressed to press the inside of the cylinder 2. However, when the pressing speed is slow, as shown in FIG. The air that has passed through presses the valve 12 by pressure, and at this time, only the amount of air that cannot pass through the orifice 13 is bypassed from the periphery of the valve 12 and is discharged to the outside from the vent hole 14.

Therefore, as shown in the figure, the valve 12 has a moving space 11
It is in a state where it has moved a little inside.

Further, if the piston 3 is suddenly pressed to the inside of the cylinder 2, the air in the space 8 pushes the valve 12 through the through hole 6 as shown in FIG. 9, and the valve 12 comes into close contact with the vent hole 14. At the same time, the air tries to go out. However, since the air can only escape through the orifice 13,
As seen in the partially enlarged view of FIG. 10, the valve 12 is curved and adheres closely.

At the same time, a plurality of slide holes 16, 16 formed around the vent hole 6 form a small space with the curved valve 12, and air is discharged from this space, which is described with reference to FIG. Even if the piston 3 is suddenly pressed, an appropriate air resistance is produced, so that the abutment of the valve 12 with the vent hole 14 is slowed by the piston 3 in the same manner as the condition already described in FIG. In this state, the conditions are the same as when moving in the cylinder 2.

In this way, in the present shock absorber 1, the presence of the cushioning portion 10 formed on the outer surface of the cylinder 2 causes the rubber valve 12 inserted therein to appropriately receive the air pressure, whereby the piston 3 The sliding is adjusted by the action of the orifice 13 and the action of the slide holes 16, 16 ...
Since the presence of 11 causes the valve 12 to move and deform under the conditions at that time, the sliding speed can be adjusted further, and the sliding of the piston absorbs the change in the opening / closing speed due to the change in the weight of the open / close storage box and is always constant. It will operate like

[Advantages of the Invention] As described above, according to the shock absorber of the present invention, the presence of the shock absorber formed on the outer surface of the cylinder causes the valve inserted in the shock absorber to receive air resistance and to be self The orifices and slide holes that it has have the effect of constantly adjusting the air flow so that the piston slides at the same time as the opening / closing speed of the open / close storage box and is always constant regardless of its weight. The opening and closing storage box will be opened and closed at the speed of.

Further, since the valve is formed of an elastic material such as rubber, even if it moves by receiving air pressure, it can operate quietly without making a sliding sound in the buffer portion. .

[Brief description of drawings]

1 to 4 are views for explaining a shock absorber according to the present invention. FIG. 1 is a front sectional view of the shock absorber, FIG. 2 is a partially enlarged sectional view of the periphery of the shock absorber, and FIG. Is the first piston rod
FIG. 4 is a sectional view taken along the line AA in FIG. 4, FIG. 4 is a view for explaining the rear surface state of the buffer portion, and FIG. 5 and FIG. 6 is a partially enlarged cross-sectional view, and FIG. 7 is an explanatory view showing a state where the piston is slowly pushed into the cylinder.
FIG. 8 is a partially enlarged sectional view of FIG. 7, FIG. 9 is an explanatory diagram when the piston is suddenly pressed, FIG. 10 is a partially enlarged sectional view of FIG. 9, and FIG. It is a section explanatory view of the shock absorber used. 1 ... shock absorber, 2 ... cylinder, 3 ... piston, 4 ... piston rod, 5 ... rear wall, 6 ... through hole, 8 ... space part, 10 ... buffer part, 11 ... move Space, 12 ... Valve, 13 ... Orifice.

Claims (1)

[Claims] 1. A cylinder 2 having at one end thereof an opening 7 through which a piston rod 4 can freely slide, and at the other end thereof, a rear wall 5 having a through hole 6 in the center thereof. In the inner diameter portion of the cylinder 2, a long piston rod 4 is connected to the piston 3 on the rear wall 5 side and is formed on the outer side portion of the rear wall 5 with a part of the piston rod 4 protruding from the opening 7. Buffer unit 10
In addition, by forming the moving space portion 11, a valve 12 made of an elastic body having an orifice 13 is arranged so that the air pressure sucked and discharged from the through hole 6 can be maintained at a constant amount. Shock absorber.