Insertable type safety coupling for pressure pipes

Details Insertable type safety coupling for pressure pipes Insertable type safety coupling for pressure pipes

1995-10-30

1997-10-28

Lee, Kevin

Valves and valve actuation

With correlated flow path

Valve operated by joining flow path sections

2511499, 1376167, F16L 3728

Patent

active

056810270

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a plug-in safety coupling for liquid or gas pressure lines. The coupling comprises a coupling socket with a blocking member pivotally mounted therein, and forms a coupling sleeve, and a coupling plug that fits within the coupling sleeve.
2. Description of Prior Art
Conventional couplings for pressures lines generally comprise a coupling plug, a socket, a mechanism for locking the coupling in the flow position so the socket and the plug are held together, and a blocking device, which prevents the escape of the pressurized medium when the coupling is released. When the coupling plug is inserted into the socket, the blocking function of the coupling is disabled and the medium can flow through the coupling. When the coupling is disengaged, the flow is blocked once again.
In one particular type of known coupling for pressure lines, a pivotable blocking member has a coupling sleeve. In the disengaged position of the coupling, the blocking member is pivoted and blocks the flow of the medium. A coupling plug can be inserted at an angle to the pressure line into the blocking member, which is mounted pivotally in a coupling socket. The coupling is brought into a flow position by pivoting the coupling plug and the blocking member in the coupling socket. When the plug has reached the flow position, it is secured in this position by the pressure existing in the pressure line, which causes the plug to partially move out of the socket and into a recess in the coupling socket, so that the plug cannot be pivoted any farther. When disengaging a coupling having a pivotable blocking member such as this, the coupling socket must be pressed against the line pressure, so the plug comes out of the recess in the coupling socket and can then be pivoted, which will block the flow of the pressurized medium. In the pivoted position, a pressure compensation between the coupling plug to be disengaged and the surroundings is achieved by a relief opening in the coupling housing. After the pressure is relieved, the plug can be pulled out of the coupling socket. In comparison to widely used couplings not having a relief opening, and which during uncoupling can be thrown out of the socket because of pressure still existing in the plug, these couplings basically are safe in handling and assist in preventing accidents.
A considerable problem which prevents a wider acceptance of such couplings having a pivotable blocking member, is the fact that uncoupling the plug requires that the plug be pushed against the line pressure into a coupling sleeve before it can be pivoted. Pushing the plug against the line pressure requires the application of a noticeable force in the case of couplings with larger dimensions, as well as for couplings with high line pressures. This force complicates the handling of the coupling and can even prevent its use.
Another reason why such couplings, notwithstanding their safety advantages, have not been more widely used, is because there are a multitude of standard plugs or couplings of pressure lines, which vary diametrically and are in common use. This means that a particular plug can only be used with a suitably fitting coupling sleeve. Because the blocking member itself forms the coupling sleeve, a unique blocking member is required for each plug type. If a different plug type is to be used, then one is forced to replace either the entire coupling socket and blocking member or, to fit a blocking member suitable for the coupling plug in the existing coupling socket. It would be far too expensive to construct a multitude of different blocking members to adapt to the different available plug types. Blocking members are produced by means of turning and milling by automatic machines and should be produced in quantities as large as possible in order to keep their price low.


SUMMARY OF THE INVENTION

Therefore it is one object of this invention to create a plug-in coupling having a pivotable blocking member which can be uncoupled comfortably w

REFERENCES:
patent: 4662396 (1987-05-01), Avnon
patent: 4905965 (1990-03-01), Dolev
patent: 5050841 (1991-09-01), Jacobsson
patent: 5326072 (1994-07-01), Wuthrich

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