JPH0514126B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for opening and closing the lid of a car storage box, for example, by always applying a predetermined braking force to open the lid slowly and at an appropriate speed. This invention relates to a shock absorber that can be opened.

[Prior art] As a prior art, the patent application filed in 1983 by the same applicant
There is a shock absorber according to No. 255181.

According to this shock absorbing device, as shown in FIG. 3, a cylinder 1 is formed with an open end 2 having a ventilation hole 3 penetrating it at one end, and the other end of the cylinder 1 is an open end in a fully open state. It has become 2a.

Further, adjustment holes 4 are provided in the peripheral wall 1a of the cylinder 1.
are bored in the central part in the longitudinal direction, and in the illustrated example, a first small hole 4a with a large diameter, a second small hole 4b with a small diameter,
A third small hole 4c is bored.

Next, an operating piston 5 is slidably fitted into the cylinder 1 at its right end, and an operating rod 5a of the piston 5 extends outward from the open end 2a. Reference numeral 5b in the figure represents an O-ring that is fitted and locked onto the outer periphery of the actuating piston 5.
Furthermore, an adjustment piston 6 is fitted on the left end side of the cylinder 1 so as to be elastically expandable and retractable so as to face the open end 2 via a first adjustment space 7 . The open end 2 is
They are connected by a spring 8 disposed within the cylinder 1.

In the figure, reference numeral 6a denotes an O-ring that is fitted and locked to the adjustment piston 6, and the piston 6 is normally in the position shown in the figure, so the sliding O-ring 6a is inserted into the adjustment hole 4. 1 Located above the small hole 4a,
It is in airtight pressure contact with the inner circumferential surface of the cylinder 1, and as a result, outside air is drawn into the cylinder 1 from the first small hole 4a.
It is now in a state where it does not flow into the body.

In addition, in the illustration, a hole located between the actuating piston 5 and the adjusting piston 6 and in communication with the outside air through the second small hole 4b and the third small hole 4c of the adjusting hole 4 is shown. Two adjustment spaces 9 are formed. Note that the space where the spring 8 exists is the first adjustment space 7.

With such a configuration, the plurality of adjustment holes 4 formed in the wall surface of the cylinder 1 are usually drilled in post-processing, so burrs are likely to appear on the inner surface of the cylinder 1, and the inner surface needs to be machined again.
Further, the diameter of the adjustment hole 4 required precision. Further, in the adjustment hole 4, air is discharged,
Inhalation tends to have stages, and problems also arise in terms of effectiveness.

[Problems to be Solved by the Invention] In view of the above-mentioned conventional problems, the present invention operates by varying the inclination angle of the adjustment groove formed in the inner wall of the cylinder, thereby increasing the external opening force. When the opening speed of the required parts increases, the amount of ventilation from the ventilation holes and the amount of ventilation from the adjustment grooves can be controlled to handle everything from small loads to large loads.
It always guarantees slow operation, and even when the direction of the external force is reversed during closing operation, the braking force is automatically applied so that the load will not become large even if the operation speed is sufficiently high. regulated, thereby making it possible to close with the same force as at normal operating speeds, and making it possible to use such a damping device with pneumatic pressure without the need for a specially constructed valve body on the actuating piston. The purpose of this is to eliminate the air level difference during opening and closing operations as in the conventional example, even when the piston is operated only by machining the inner wall of the piston and guarantees starting.

[Means for Solving the Problems] The present invention has been devised to achieve the above object, and provides a shock absorber in which the cylinder has an actuating piston at one end thereof and a vent hole. facing the other end side provided with the first adjustment space,
Further, adjustment pistons connected to the other end side by a spring are closely fitted so as to be movable forward and backward, and a second adjustment space is formed in the inner wall surface of the first adjustment space of the cylinder by the expansion or contraction operation of the working piston. The adjustment groove is formed in an inclined shape so that the groove depth gradually changes toward the second adjustment space so that the adjustment piston is displaced by expansion of negative pressure and reduction of pressure increase. .

[Function] By configuring the present invention as described above, when the actuating piston receives a high load force, the second adjustment space becomes negative pressure, and the adjustment is performed due to the influence of the negative pressure. The piston moves to suppress sudden movement of the working piston. That is, at this time, the adjustment groove always has the function of controlling the adjustment piston, and the inclined body of the adjustment groove regulates the release of the amount of air into the second adjustment space.

Thus, the second adjustment space transmits the effect of negative pressure to the adjustment groove via the adjustment piston.
This means that the working piston receives the same effect whether it is pushed or pulled inside the cylinder.
This makes it possible to reduce the braking force against sudden displacements of the working piston.

[Embodiment] To describe the present invention in detail with reference to the embodiment shown in FIG. 1, the shock absorbing device 10, as shown in FIG. All of them are basically made of synthetic resin material.

Specifically, the cylinder 11, which has a cylindrical shape as shown in FIG. An operating piston 12 is disposed within the cylinder 11 with its own piston rod 12a extending from the open hole 16b. and piston rod 12
At the tip of a is a mounting hole 1 for attaching the object to be mounted.
2b is drilled. Further, on the end wall 16 side, an adjustment piston 13 is provided opposite to the operating piston 12.
is arranged, and the adjusting piston 13 is connected to the end wall 16.
The adjusting piston 13 is held in place by a spring 17 held on the inner wall 18 of the adjusting piston 13, so that the adjusting piston 13 is always elastically subjected to a tensile load on the end wall 16 side.

The two pistons described above create a first adjustment space 14 between the adjustment piston 13 and the end wall 16, and a second adjustment space 15 between the adjustment piston 13 and the working piston 12. , respectively.

Next, on the inner wall 18 of the cylinder 11, an adjustment groove 19 is formed with a semicircular cross section, as shown in FIG. 2, just around the position where the adjustment piston 13 is disposed. Then, the adjustment groove 1
Numeral 9 is an inclined body that adjusts the depth of the groove so that it becomes shallower as it approaches the direction of the piston 13.

Here, in the view A shown in FIG. 2, the adjustment groove 1
9 shows a deep part, and FIG. 9 shows a part where the adjustment groove 19 is shallow.

Note that each piston is provided with an O-ring 20, which tightly presses against the inner wall 18 of the cylinder 11 to improve sliding movement, and at the same time, prevents air flow.

Next, the operation will be explained below in Figure C shown in FIG. 1.

Figure C shows the actuating piston 12 being slowly pulled under a light load. In this case, since the load is low, air from the adjustment groove 19 is sucked under the same conditions as the operating speed of the actuating piston 12, so that the second adjustment space 15 is not subjected to sudden negative pressure, and the second adjustment space 15 is free from sudden negative pressure. Therefore, the adjusting piston 13 remains stationary at a predetermined position.

This is because the air pressure in the first adjustment space 14 and the second adjustment space 15 is the same, and even if the areas of both spaces change, the air pressure in the first adjustment space 14 causes the adjustment piston 13 to spring. This is because the pressure required to move against the spring pressure of 17 is not generated.

FIG. D is an explanatory diagram when the actuating piston 12 is suddenly pulled under pressure by the object to which it is attached. That is, when the working piston 12 is suddenly pulled, the second
The adjustment space 15 is made negative pressure without receiving air discharge from the adjustment groove 19, thereby reducing air resistance.

Therefore, the adjustment piston 13 is inserted into the first adjustment space 1
4, and moves in the direction of the actuating piston 12 against the spring pressure of the spring 17. At this time, the adjustment piston 13 is in the adjustment groove 19.
Since the tip position of the O-ring 20 has been moved, the presence of the O-ring 20 substantially blocks air flow.

The working piston 12 is located in the second adjustment space 15
Because it cannot slide freely due to air resistance,
You will be able to move slowly.

FIG. E is an explanatory view of pushing the actuating piston 12 inward into the cylinder 11. That is, when pressing the actuating piston 12 at a slow speed, the air pressure in the second adjustment space 15 slowly accumulates in the first adjustment space 14 through the adjustment groove 19; The air accumulated in the air is discharged to the outside through the ventilation hole 16a again. As a result, the first adjustment space 14 and the second adjustment space 15 have the same air pressure, thereby regulating the speed of movement.

FIG. F is an explanatory diagram when a sudden pressing force is applied to the actuating piston 12 in the inner direction of the cylinder 11. That is, the air in the second adjustment space 15 is compressed by rapid pressurization, and the adjustment piston 13 is pressed by this influence.

At this time, as the adjustment piston 13 moves toward the end wall 16, it moves against the spring pressure of the spring 17, and the air circulation is expanded through the adjustment groove 10, so that the air can easily flow through the first adjustment space 14. Vent hole 16a
will be released to the outside.

As mentioned above, the moving speed of the actuating piston 12 is affected by air pressure, and the same operation as described in FIG. E will occur.

Note that the locking body 16c protruding from the end wall 16 of the cylinder 11 is a device for attaching to a mating plate.

As explained above, the same buffering effect works whether the cylinder is pressed or pulled.
It has become possible to accurately control air resistance and guarantee the desired slow operation.

[Effects of the Invention] Since the present invention is configured as described above and can be realized as in the above embodiments, when the present invention is used in the above-mentioned mounted body such as a switchgear, etc., when the load is caused by a large external force, automatically increases the braking force, therefore both when the external force is small and large.
By using air pressure, it is possible to always ensure a slow opening operation, and even when the external force is reversed, if the reverse is quickly performed, the braking force against the reverse movement is automatically reduced, thereby, It is possible to perform reverse movement by a light external force, which is the same as when reverse movement is performed slowly, and it is possible to provide an easy-to-use shock absorbing device.

Furthermore, according to the present invention, there is no need to form a special valve body on the actuating piston or an assembly process;
Therefore, it can be provided at a low cost, and since the braking force is adjusted by controlling the amount of air flowing into or out of the cylinder, it is easy to create a shock absorber that can adequately handle large loads. In addition, it eliminates the need for a separate drilling process for orifice holes, and eliminates processes such as deburring. Further, since the adjustment groove is a sloped body, the air pressure can be changed steplessly, so that the buffering effect can be performed steplessly and continuously.

[Brief explanation of the drawing]

Figure A in Figure 1 is a perspective view showing one embodiment of the shock absorbing device according to the present invention, and the following diagrams from B in the same figure illustrate the operating state of the same device, where Figure B is in its normal state and Figure C is in its slow state. Figure D is a rapid extension state, Figure E is a slow contraction state, and Figure F is a rapid contraction state. Figure 2 is a diagram explaining the shape of the adjustment groove. A is a sectional view showing a deep groove, FIG. B is a sectional view showing a shallow groove, and FIG. 3 is a sectional view of a conventional shock absorber. 10...Buffer device, 11...Cylinder, 12
...Operating piston, 13...Adjusting piston, 14
...first adjustment space, 15...second adjustment space,
16...End wall, 17...Spring, 18...Inner wall, 19...Adjustment groove.

Claims (1)

[Claims] 1. The cylinder 11 has an actuating piston 12 at one end thereof, and an adjustment piston 12 at the other end provided with a ventilation hole 16a, which faces the cylinder 11 with a first adjustment space 14 in between and is connected to the other end by a spring 17. The pistons 13 are closely fitted inside so that they can move forward and backward, respectively, and the inner wall 18 of the first adjustment space 14 of the cylinder 11 has an expansion or negative pressure in the second adjustment space 15 due to the expansion or contraction operation of the working piston 12. A buffer characterized by having an adjustment groove 19 formed in an inclined shape whose groove depth gradually changes toward the second adjustment space 15 so that the adjustment piston 13 is displaced by reduction and pressure increase. Device.