US 7,921,875 B2Granted

Fluid coupling

AssigneeKabushiki Kaisha Nagahori Shokai

InventorsAtsushi Moriiki, Katsuya Nishi, Yoshinori Abura

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Abstract

In the fluid coupling for connecting the fluid passages of a plug (1) and a socket (2), a valve (33), a valve holder (31) and a spring (32) disposed in a compressed state between the valve (33) and the valve holder (31) are accommodated inside each of the plug (1) and the socket (2) to be connected to each other the plug (1) is inserted into the socket (2), the valve (33) of the plug (1) and the valve (33) of the socket (2) make contact with each other so that the valves (33) are retracted resisting an urging force of the spring (32). This fluid coupling further includes conical members (32, 51) which form a conical external shape along a line connecting the outside diameter portion of the valve (33) and the outside diameter portion of the valve holder (31) when the valve (33) of the plug (1) and the valve (33) of the socket (2) make contact with each other, so that the springs (32) are compressed between the valve (33) and the valve holder (31).

A fluid coupling comprising a plug and a socket that are connectable to each other in a liquid-tight manner,

the plug including a valve, a valve holder and a spring accommodated inside of the plug, the spring being adapted to apply an urging force to the valve so that the valve makes pressure contact with a valve seat formed on an inner peripheral face of the plug,
the socket including a valve, a valve holder and a spring accommodated inside of the socket, the spring being adapted to apply an urging force to the valve so that the valve makes pressure contact with a valve seat formed on an inner peripheral face of the socket,
wherein when the plug is inserted into the socket, the valve of the plug and the valve of the socket make contact with each other so that the valves are retracted so as to resist the urging force of the springs to connect the fluid passage of the plug with the fluid passage of the socket,
wherein each of said springs is a conical coil spring that forms a conical external shape along a line connecting an outside diameter portion of the valve and an outside diameter portion of the valve holder when the valve of the plug and the valve of the socket make contact with each other so that the springs are compressed between the valve and the valve holder,
wherein each of the conical coil springs has a small diameter portion and a large diameter portion,
wherein the small diameter portion of the conical coil spring has substantially the same diameter as the outside diameter of an annular portion which supports the spring and through which a valve shaft of the corresponding valve passes,
wherein the large diameter portion of the conical coil spring has substantially the same diameter as an outside diameter of the corresponding valve, and
wherein, when the valve of the plug and the valve of the socket make contact with each other so as to compress the conical coil springs, coils of the conical coil spring in the plug approach each other and coils of the conical coil spring in the socket approach each other.

5 more elements

Facts

Application

12/232,725Filed 23 Sep 2008

Priority

JP 2007-25514628 Sep 2007

Published

US 2009/0091129 A19 Apr 2009

Granted

12 Apr 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16L 37/23
In which the connection is maintained by means of balls, rollers or helical springs under radial pressure between the parts: by means of balls
F16L 37/32
With fluid cut-off means in each of two pipe-end fittings: at least one of two lift valves being opened automatically when the coupling is applied
Y10T 137/87949
Each valve and/or closure operated by coupling motion: linear motion of flow path sections operates both
Y10T 137/87957
Linear motion of flow path sections operates both: valves actuate each other

Abstract

Claims15