JPH07317997A - Gas filling chuck - Google Patents

Abstract

PURPOSE:To prevent the chuck from being tilted when a filling port is held, and also prevent gas from leaking by letting the filling port be so constituted as to be held by four hold pawls in the gas filling-up chuck connecting a gas hose with the gas filling port of a gas storing container. CONSTITUTION:An outer cylinder 3 is fitted in the front end of a cylindrical holder 1, and hold pawls 15 for holding the outer circumference of a gas filling port 14 are provided for four places over the circumference of the front end of the outer cylinder 3 in such a way as to be freely opened/closed. Besides, a cylindrical piston 4 with a gas hose connection pipe 4a is inserted in the inside of the holder 1 in such a way that it can be slid. And a ball valve 10 is provided in the connection pipe 4a in such a way as to be freely advanced/ retreated. When gas is filled up, insertion of the gas filling port into the outer cylinder 3 permits a ball valve opening rod 12 to be pushed in the retreating direction so as to allow a movable sleeve 6 to be moved backward, and four hold pawls 15 are thereby closed, so that the filling port 14 is held at four places over its outer circumference. And gas is simultaneously filled up through the ball valve 10 pushed and opened by the rod 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas filling chuck for connecting a gas hose to a gas filling port of a gas storage container when filling the gas storage container with gas.

[0002]

2. Description of the Related Art In a car production line, a receiver tank of a car cooler is filled with a refrigerant gas. This gas filling is performed by connecting a hose from the refrigerant gas storage tank and a gas filling chuck to the gas filling port of the receiver tank.

A conventional gas filling chuck is shown in FIGS.
As shown by, the outer cylinder 3 is concentrically fixed to the front end of the cylindrical holder 1, and the outer circumference of the front end of the outer cylinder 3 is openable and closable at two positions on the circumference to grip the outer periphery of the gas filling port 14. Gripping claw 1
5 and a cylindrical piston 4 having a gas hose connection pipe 4a that is fitted in the holder 1 concentrically with the outer cylinder 3 so as to be slidable in the front-rear direction and extends rearward through the center of the holder 1 and , A ball valve 10 which is inserted into the gas hose connection pipe 4a so as to be able to move forward and backward and is pressed by a spring 11 to close the gas passage 9, a guide cylinder 5 which is concentrically fixed in the outer cylinder 3, and a guide cylinder 5 A movable sleeve 6 which is slidably inserted in the front and rear direction to open and close the grip claw 15.
A ball valve opening which is held at the center of the movable sleeve 6 and constantly presses the movable sleeve 6 in the forward direction by a spring 13 and pushes it in the backward direction by a gas filling port 14 to open the ball valve 10. It is the structure provided with the rod 12.

In the conventional gas filling chuck having the above structure, the movable sleeve 6 is moved forward by the spring 13 of the ball valve opening rod 12 in the closed state in which the outer cylinder 3 is not inserted into the filling port 14, as shown in FIG. Is pushed in the direction to project from the front end of the guide tube 3, opens the grip claw 15, and the ball valve 10 is pressed by the spring 11 to the gas passage 9 to close the gas passage 9, and the gas introduced from the gas hose 2 into the gas hose connection pipe 4a. Has blocked the flow of.

When filling the gas, the filling port 14 pushes the ball valve opening rod 12 in the backward direction as shown in FIG. 4 by inserting the filling port 14 into the outer cylinder 3 in the above state. In addition, the movable sleeve 6 is moved backward.
As a result, the gripping claw 15 that has been opened by the movable sleeve 6 is closed to grip the outer periphery of the filling port 14, and the ball valve opening rod 12 moves the ball valve 10 backward against the pressing force of the spring 11. The passage 9 is opened, and the gas from the gas hose connection pipe 4a flows into the filling port 14 to fill the receiver tank.

[0006]

In the above-mentioned conventional gas filling chuck, the movable sleeve 6 slidably fitted in the guide cylinder 5 stores lubricating grease on its outer peripheral sliding surface. The grease reservoir groove 7 and the O-rings 8 mounted on both sides of the grease reservoir groove 7 are provided. However, the gas in the grease reservoir groove 7 is washed away by the gas discharged from the gas passage 9, so that the movable sleeve is moved. Was malfunctioning.

Further, since the gripping claws 15 for gripping the filling port 14 are two claws, the chuck is apt to be slanted, which causes a problem of gas leakage during gas filling.

An object of the present invention is to provide a gas filling chuck that solves the above-mentioned conventional problems.

[0009]

According to the present invention for achieving the above object, an outer cylinder is concentrically fixed to a front end of a cylindrical holder, and a front end of the outer cylinder is opened and closed at four positions on the circumference. And a gas hose penetrating into the holder so as to be concentric with the outer cylinder and slidable in the front-rear direction so as to be slidable in the front-rear direction and extending rearwardly through the center of the holder. A tubular piston having a connecting pipe, a ball valve inserted in the gas hose connecting pipe so as to be able to move forward and backward and pressed by a spring to close the gas passage, a guide cylinder fixed concentrically in the outer cylinder, and this guide A movable sleeve that is slidably inserted in the cylinder in the front-rear direction to open and close the grip claw,
A ball valve opening rod that is held in the center of the movable sleeve and constantly presses the movable sleeve in the forward direction by a spring, and pushes the movable sleeve in the backward direction by a gas filling port to open and move the ball valve; And a packing which is fixed to the retracted end position of the movable sleeve and which is brought into pressure contact with the rear end of the movable sleeve for sealing.

[0010]

With the above structure, the chuck is not tilted by the gripping of the filling port by the four gripping claws, the chucking can be performed without causing gas leakage, and the guide sleeve at the retracted end position of the movable sleeve is provided. Since the rear end of the movable sleeve is pressed against the fixed packing for sealing, the conventional grease reservoir groove and O-ring are not required, and the malfunction of the movable sleeve is eliminated to enable long-term use.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a cylindrical holder.
An outer cylinder 3 is concentrically fixed to the front end of the holder 1, and a gas filling port 14 described later is provided at four positions on the circumference of the front end of the outer cylinder 3.
A grip claw 15 for gripping the outer periphery of the is provided so as to be openable and closable.

A cylindrical piston 4 having a gas hose connection pipe 4a extending rearward through the center of the holder 1 and fitted in the holder 1 is concentric with the outer cylinder 3 and is slidable in the front-rear direction. A ball valve 10 that is pressed by a spring 11 to close the gas passage 9 is inserted into the gas hose connection pipe 4a so as to be able to advance and retract.

A guide cylinder 5 is concentrically fixed in the outer cylinder 3, and a movable sleeve 6 for opening and closing the grip claw 15 is fitted in the guide cylinder 5 so as to be slidable in the front-rear direction.

A spring 13 constantly presses the movable sleeve 6 in the forward direction in the center of the movable sleeve 6,
In addition, a ball valve opening rod that is pushed by the gas filling port 14 in the backward direction to open the ball valve 10 is held.

At the retracted end position of the movable sleeve 6 in the guide cylinder 5, a packing 17 such as a sponge for fixing the rear end of the movable sleeve 6 in pressure contact and sealing is fixed. Reference numeral 2 is a gas hose connected to the gas hose connection pipe 4a.

The operation of the gas filling chuck having the above-described structure according to the present invention is almost the same as that of the conventional gas filling chuck shown in FIGS. That is, in the closed state in which the outer cylinder 3 is not inserted into the filling port 14, the movable sleeve 6 moves the spring 1 of the ball valve opening rod 12 as shown in FIG.
4 is pushed in the forward direction by the protrusion 4 and protrudes from the front end of the guide cylinder 3, opens the grip claw 15, and causes the ball valve 10 to move to the spring 11
Is pressed by the gas passage 9 to close the gas passage 9, and the flow of the gas introduced from the gas hose 2 to the gas hose connection pipe 4a is blocked.

When filling the gas, the filling port 14 pushes the ball valve opening rod 12 in the backward direction as shown in FIG. 1 by inserting the filling port 14 into the outer cylinder 3 in the above state. To move the movable sleeve 6 backward. As a result, the four holding claws 1 opened by the movable sleeve 6
5 closes and grips the outer periphery of the filling port 14 at four places, and the ball valve opening rod 12 moves the ball valve 10 backwards against the pressing force of the spring 11, opens the gas passage 9, and opens the gas hose connection pipe 4a. The receiver tank is filled with the gas from the filling port 14.

When the gas filling the receiver tank with the gas through the filling port 14 flows, the movable sleeve 6 moves backward as described above. At the backward moving end of the movable sleeve 6, the packing 17 fixed in the guide cylinder 5 is provided.
The rear end 6a of the movable sleeve 6 is pressed against and seals, and this packing 17 prevents gas leakage from the sliding surface between the guide cylinder 5 and the movable sleeve 6.

Air inlet 16 provided in holder 1
From the above, in the gas filling state of FIG. 1, when unchucking after the gas filling is completed, the piston 4 is moved forward by introducing air into the back surface of the piston 4, and the spring 13 of the ball valve opening rod 12 is used. The movable sleeve 6 is pushed forward to open the grip claws 15, and the grip of the filling port 14 is released to automatically uncuck.

[0020]

As described above, in the gas filling chuck according to the present invention, the gripping claw is opened and closed by sliding forward and backward in the guide tube,
In addition, as a seal structure for preventing gas leakage from the sliding surface between the movable sleeve that moves the ball valve forward and backward to open and close the gas passage and the guide cylinder, a movable sleeve is provided at the retracted end position of the movable sleeve in the guide cylinder. Since the packing which seals the rear end by pressure contact is fixed, the grease reservoir groove and the O-ring as in the prior art are not required, and the malfunction of the movable sleeve is eliminated to enable long-term use.

Further, since the holding claws for holding the filling port of the receiver tank are composed of four claws for holding four places on the outer periphery of the filling port, the chuck can be tilted with respect to the filling port. The chuck is no longer gripped, and the chuck and filling port are always connected on the same axis to prevent gas leakage problems.

[Brief description of drawings]

FIG. 1 is a sectional view of a chuck of the present invention in a gas-filled state.

FIG. 2 is a sectional view of the chuck of the present invention in a gas cut-off state.

FIG. 3 is an exploded perspective view of the chuck of the present invention.

FIG. 4 is a sectional view of a conventional chuck in a gas-filled state.

FIG. 5 is a sectional view of a conventional chuck in a gas cutoff state.

FIG. 6 is an exploded perspective view of a conventional chuck.

[Explanation of symbols]

 1 Holder 2 Gas Hose 3 Outer Cylinder 4 Piston 4a Gas Hose Connection Pipe 5 Guide Cylinder 6 Movable Sleeve 10 Ball Valve 11 Spring 12 Ball Valve Opening Rod 13 Spring 14 Filling Port 15 Grip Claw 16 Air Inlet 17 Packing

Claims (1)

[Claims] 1. An outer cylinder concentrically fixed to the front end of a cylindrical holder, and gripping claws that are openable and closable at four positions on the circumference of the front end of the outer cylinder to grip the outer periphery of a gas filling port, A cylindrical piston having a gas hose connection pipe concentrically inserted in the holder so as to be slidable in the front-rear direction in the holder, extending backward through the center of the holder, and retracted into the gas hose connection pipe. A ball valve that is freely inserted and pressed by a spring to close the gas passage, a guide cylinder that is concentrically fixed in the outer cylinder, and a grip claw that is slidably inserted in the guide cylinder in the front-rear direction. With a movable sleeve that opens and closes
A ball valve opening rod that is held in the center of the movable sleeve and constantly presses the movable sleeve in the forward direction by a spring, and is pushed in the backward direction by a gas filling port to open and move the ball valve; and in the guide cylinder. And a packing for fixing the movable sleeve at the retracted end position and sealingly contacting the rear end of the movable sleeve with pressure.