JPS5940616Y2 - Valve for operating cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating valve for supplying air to and discharging air from an operating cylinder used for raising a chair, opening a door, etc.

A flow path opening/closing device in which a plurality of flow paths are switched by one operating body is conventionally known, as shown in, for example, Japanese Utility Model Application No. 48-74119.

This flow path opening/closing device forms two flow paths in the cock body, and is equipped with a pair of valve bodies that open and close these flow paths, respectively.The operating body is rotated to open and close the pair of valves using its uneven parts. The body opens and closes to allow fluid flowing into the cock body from the inlet to flow to the desired outlet path.

However, such a device does not have a structure that automatically rotates the operating body back to the intermediate rotation position and closes the pair of valve bodies, so this device is used to raise a chair, open a door, etc. When used as an operating valve for an operating cylinder, the following disadvantages arise.

That is, even if the operator releases the operator's hand, the operator does not return to the intermediate rotation position, and therefore one of the pair of valve bodies remains open.

Therefore, in order to close the pair of valve bodies together, a recess that closes the pair of valve bodies together is formed in the operating part of the operating body, and the operating body is manually rotated to a predetermined rotation position. need to be operated manually.

However, when the pair of valve discs are closed by manually rotating the operating body in this way, it takes time for the pair of valve discs to close, making it difficult to stop the operating cylinder at the desired position. This makes it difficult to accurately adjust the height of the chair or open/close the door.

The present invention was devised in view of these circumstances, and its purpose is to provide a valve for operating a working cylinder that can accurately stop the working cylinder at a desired position. The gist is: an air chamber formed within the housing and communicating with an external actuating cylinder; a shaft that is hermetically inserted into the air chamber and rotated by lever operation; and a device that limits the rotation range of the shaft. and a shaft rotation limiting device that automatically rotates the shaft back to an intermediate rotation position in the rotation range; and an air supply valve that opens and closes a communication path between the air chamber and the compressed air supply source; An exhaust valve that opens and closes a communication path between the air chamber and the atmosphere, and an exhaust valve that is attached to the shaft and is selectively attached to the air supply valve or the exhaust valve depending on the direction of rotation of the shaft starting from the intermediate rotation position. The air supply valve or the exhaust valve is selectively opened by engaging with the air supply valve or the exhaust valve, and the rotational return of the shaft to the intermediate rotational position causes the air supply valve to separate from the air supply valve and the exhaust system and open the air supply valve. There is a valve for operating an operating cylinder, which is composed of a tongue piece that closes a valve and an exhaust valve, respectively.

The present invention will be described below with reference to embodiments shown in the drawings.

The actuating cylinder operating valve according to the present invention has an air chamber 2 (see FIG. 4) formed in a housing 1.
A shaft 3 is inserted therein, and a lever 4 is provided at one end of the shaft, and various valves and the like to be described later are also provided.

The valves disposed in the housing 1 include an exhaust valve 5 that discharges compressed air from the air chamber 2 to the atmosphere, and an air supply valve 6 that supplies compressed air from an air source (not shown) to the air chamber 2. Air chamber 2
When the air pressure exceeds a set pressure, the pressure regulating valve 7 discharges compressed air to the atmosphere to maintain the air chamber 2 at a constant pressure or less.

Furthermore, the housing 1 has an air passage 8 associated with the air chamber 2 and communicating this chamber with an actuating cylinder (not shown), and a shaft 3.
The shaft rotation limiting device 9 is provided to limit the rotation of the shaft.

The exhaust valve 5 and the air supply valve 6 are arranged in association with a tongue 11 fixed in a cutout 10 in the underside of the shaft 3, and a valve body 14.15 is biased by a respective spring 12.13. The valve is closed under normal conditions.

In the embodiment, the intake valve 6 and the exhaust valve 5 comply with JIS
An automobile tire valve core specified in D4211 and a modified version thereof are used.

As shown in FIG. 5, the valve body 14 (numeral 15 for the air supply valve 6; elements of the air supply valve corresponding to the exhaust valve elements are shown in parentheses) is supported by springs 12 and 13. The valve seat 16°17 is pushed upward in the body 1.
The valve is closed by contacting the valve seat 20.21 at the lower end in the figure 8.19.

This valve is actuated by pulling down the lower extension 22 shown in chain lines in the figures of the valve body 14.15 (or pushing down the upper extension 23. in the figure).
The valve seats 16 and 17 of 15 are connected to the valve seats 20 and 2 of the body 18° and 19.
1, the valve is opened, and the lower space 24 in the figure is communicated with the upper space 27 through the upper opening 26 of the space 25 in which the spring 12, 13 is housed.

Note that 29.30 is a gasket interposed between the body portion 18.19 and the housing 1.

The exhaust valve 5 is the valve shown in FIG. 5 arranged in the housing 1 in the same direction (see FIG. 4), and its valve body 14
The extension part 22 of is engaged with the tongue piece 11.

In addition, the air supply valve 6 is arranged in the housing 1 in the reversed state of the valve shown in FIG. It is arranged at an appropriate distance from the tongue piece.

Note that 31 and 32 in FIG. 4 are orifices.

As shown in FIG. 6, the pressure regulating valve 7 has the ball valve body 33 brought into contact with the valve seat 35 of the housing 1 by the biasing force of the spring 34, and is closed in the normal state.

This spring 34 determines the activation pressure of the ball valve body 33, and its urging force is adjusted by a screw 36.

In addition, in FIG. 6, reference numeral 37 indicates a ventilation passage that communicates the hollow portions 38 of the seven pressure regulating valves with the hollow portions 39 of the five exhaust valves.

The shaft rotation limiting device 9 forms a cutout plane 40 on the upper surface of the shaft 3, and a piston 41 is brought into contact with this plane by the biasing force of a spring 42.

Note that the screw 43 serves as a seat for the spring 42, and
It serves as a stopper for the piston 41, and an elastic material 45 such as rubber is provided at the lower end 44, and the piston 41 is connected to the screw 43.
When it hits the lower end 44 of the blade, the impact is alleviated and the generation of impact noise is prevented.

The operating cylinder operating valve according to the present invention is connected to the artificial port 46 of the air supply valve 6 and an air source such as an air tank (not shown).
The operation valve, which is piped like a pinwheel and communicates the port 47 of the air passage 8 of the air chamber 2 with the operating cylinder (not shown), operates as follows.

When the lever 4 is rotated in the direction A in Fig. 1, the shaft 3
The tongue 11 fixed to the inlet port 4 pushes up the extension 23 of the air supply valve 6, thereby opening the valve and removing the air source from the inlet port 4.
6 is introduced into the air chamber 2 through the orifice 32.

The compressed air introduced into the air chamber 2 is passed through the air passage 8 and the port 47.
The piston reaches an actuating cylinder (not shown) through which the piston is actuated to operate a door or the like.

If you let go of the lever 4 while the door is operating, the biasing force of the spring 42 of the shaft rotation limiting device 9 will cause the shaft 3 (
The lever 4) returns to its original state (intermediate rotational position).

When the shaft 3 (lever 4) returns to its original state, the force pushing up the extension part 23 of the air supply valve 6 is released, so the air supply valve 6 closes and the door etc. returns to its operating position. It will stop at.

Next, when the lever 4 is rotated in the direction B in FIG. Orifice 31. It is released to the atmosphere via outlet port 48.

It is assumed that the above-mentioned working cylinder is biased by some method in a direction in which the piston thereof decreases the cylinder volume.

In each of the above steps (especially when supplying compressed air)
When the pressure in the air chamber 2 becomes abnormally high, the compressed air in the chamber pushes up the ball valve body 33 against the biasing force of the spring 34, opens the pressure regulating valve 9, and compresses the air chamber 2. Air is released to the atmosphere from the outlet port 48 through the hollow portion 38, the air passage 37, the hollow portion 39 of the exhaust valve 5, and the orifice 31 of the exhaust valve 5.

When operating the lever, the piston 41 of the shaft rotation limiting device 9 is pushed upward as the shaft 3 rotates, but the piston 41 stops rising when it comes into contact with the lower end 44 of the screw 43. is restricted, and therefore the rotation of the shaft 3 is also restricted.

That is, the shaft rotation limiting device 9 determines the operating range (angle) of the lever 4 by adjusting the screw 43 thereof.

Further, in this shaft rotation limiting device 9, when the piston 41 hits the lower end 44 of the screw 43, the impact is alleviated by the elastic material 45 such as rubber, thereby preventing the generation of impact noise.

Further, the orifices 31 and 32 provided in the exhaust valve 5 and the air supply valve 6 are used to moderate the supply and exhaust speed of compressed air.

As described above, the operating cylinder operating valve according to the present invention is easy to operate and can supply and discharge an arbitrary amount of compressed air, so that the operating cylinder can be stopped at an arbitrary position.

[Brief explanation of the drawing]

Fig. 1 is a front view of the actuating cylinder operating valve according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a bottom view with the bottom plate removed, and Fig. 4 is similar to Fig. 2. Figure 5 is a hand-sewn cross-sectional view of the valve used as the supply/exhaust valve of the present invention, Figure 6 is a cross-sectional view taken along the line Y-Y in Figure 2, and Figure 7 is
The figure is a sectional view taken along the line Z-Z in FIG. 2. 1...Housing, 2...Air chamber, 3
...Axis, 4...Lever, 5...
・Exhaust valve, 6...Air supply valve, 7...Pressure adjustment valve, 8...Air passage, 9...Shaft rotation restriction device, 10 ...Notch, 11...
Tongue piece, 12.13... Spring, 14.75...
... Valve body, 16.17 ... Valve seat, 18.19
...Body part, 20.21 ...Valve seat, 22
．． 23... Extension part, 24, 25... Space, 26... Opening, 27... Space, 2
9゜30... Patsukin, 31.32...
・Orifice, 33...Ball valve body, 34...
... Spring, 35 ... Valve seat, 36 ...
・Screw, 37...Vent passage, 38.39...
... Hollow part, 40 ... Notch plane, 41 ...
...Piston, 42...Spring, 43...
・Screw, 44...Lower end, 45...Elastic material, 46...Artificial port, 47...Port, 48...Outlet port .

Claims (5)

[Scope of utility model registration request] (1) An air chamber formed in the housing and communicating with an external actuating cylinder, a shaft hermetically inserted into the air chamber and rotated by lever operation, and limiting the rotation range of the shaft; A shaft rotation limiting device that automatically returns the shaft to an intermediate rotation position in the rotation range, an air supply valve that opens and closes a passage between the air chamber and the compressed air supply source, and the air chamber and the compressed air supply source. An exhaust valve that opens and closes a communication path with the atmosphere is attached to the shaft, and selectively engages with the air supply valve or the exhaust valve depending on the direction of rotation of the shaft starting from the intermediate rotation position. to selectively open the air supply valve or the exhaust valve, and by returning the shaft to the intermediate rotation position,
An operating cylinder operating valve comprising a tongue piece spaced apart from the air supply valve and the exhaust valve to open the air supply valve and the exhaust valve, respectively. (2) Utility model registration claim No. 1, characterized in that a pressure regulating valve is added to the housing so that the air in the air chamber is released to the atmosphere when the pressure in the air chamber exceeds a set pressure. Valve for operating the operating cylinder described in item 1). (3) Utility model registration claim No. 2, characterized in that the pressure regulating valve is composed of a ball valve body, a spring that biases the valve body, and a screw that adjusts the set pressure of the spring. Valve for operating the actuating cylinder as described in section. (4) The above-mentioned shaft rotation limiting device has a notch plane provided on the shaft, a piston urged by a spring is brought into contact with the plane, a rubber-like elastic stopper is disposed above the piston, and the above-mentioned spring Utility model registration claim No. (1) characterized in that the screw for adjusting the set pressure of the housing is screwed into the housing.
Valve for operating the actuating cylinder as described in . (5) The valve for operating an operating cylinder according to claim 1, wherein orifices are formed in the outlet port of the exhaust valve and the artificial port of the air supply valve.