Fluid handling – Systems – Flow path with serial valves and/or closures
Reexamination Certificate
1998-08-19
2001-01-30
Fox, John (Department: 3753)
Fluid handling
Systems
Flow path with serial valves and/or closures
C137S614010
Reexamination Certificate
active
06179001
ABSTRACT:
The invention relates to a rapid-action coupling.
Such rapid-action couplings are known.
They are used for instance to couple conduits which are adapted to transport a fluid, for instance a gas or a liquid. Such rapid-action couplings are thus used for instance to mutually connect flexible hydraulic conduits.
Particularly to the case of applications in hydraulics, for instance connecting a hydraulically driven apparatus to a hydraulic drive element, it is necessary for the hydraulic pump to be connected to the tool not only by means of a pressure line but also by a return line.
According to the prior art use is made herein of separate rapid-action couplings, i.e. one for the pressure line and another for the return line.
This is less than desirable in many situations, particularly when such a connection must be effected within a short space of time. Such a situation also occurs for instance when such a connection must be effected in a stress situation. There is also the danger here, if the couplings are not different, of an incorrect connection being made.
From GB-L-009087 is known a rapid-action coupling comprising a male part connected to a first and a third conduit and a female part connected to a second and a fourth conduit for releasable mutual connection of at least the first to the second conduit and for releasable mutual connection of the third conduit to the fourth conduit.
In this coupling of the prior art the male and female coupling elements are each mounted on a carrier. By moving the carriers toward each other the male and female coupling parts can be brought into mutual contact to form a connection. There is however the danger herein of the carriers being moved toward each other at an angle so that a properly sealing coupling is not effected. This coupling of the prior art further results in an awkward construction which is difficult to handle. Another drawback is that at least one of the coupling parts must be fixed in one of the plates with a certain clearance because couplings of such a construction can never be manufactured with the required precision.
The object of the present invention is to obviate the above stated problems.
This object is achieved in that the male part and the female part of the rapid-action coupling each comprise a shell formed in one piece.
According to a preferred embodiment, at least at the position of the separating plane between the male and female part, the connecting channels arranged in the said parts are concentric.
This results in the advantage that the male part of the rapid-action coupling can rotate relative to the female part of the rapid-action coupling, which reduces possible torsional tensions in the rapid-action couplings and the conduits connected thereto.
According to yet another embodiment the first and the third conduit and the second and the fourth conduit are mutually concentric at least at the connection to the male part respectively the female part. This has the advantage that concentric conduits can be used, which simplifies the conduit configuration; for the user it is then as if he couples only at least one conduit instead of two.
REFERENCES:
patent: 4219048 (1980-08-01), Ekman
patent: 4991626 (1991-02-01), Grantham
patent: 5014743 (1991-05-01), Makishima
patent: 5297574 (1994-03-01), Healy
patent: 616242 (1961-03-01), None
patent: 0172996 (1986-03-01), None
patent: 2466697 (1981-04-01), None
B.V. Holmatro Industrial Equipment
Banner & Witcoff , Ltd.
Fox John
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