Pipe coupling having line pressure actuated threaded segments

Details Pipe coupling having line pressure actuated threaded segments Pipe coupling having line pressure actuated threaded segments

1984-08-20

1985-10-01

Chambers, A. Michael

Fluid handling

Systems

Flow path with serial valves and/or closures

285 35, 285306, 2511499, F16L 3728

Patent

active

045439958

DESCRIPTION:

BRIEF SUMMARY
The present invention refers to a plug coupling according to the generic clause of patent claim 1.
A plug coupling of this type is known from U.S. Pat. No. 1,297,719. This plug coupling uses a sleeve which is attached to the outer side of the pressure conduit and which has in the rear end wall thereof openings through which clamping jaws extend, one side of said clamping jaws being attached to a fastening member. The clamping jaws engage a thread of a thread connection means, which is inserted into said sleeve, due to the fact that their free ends are provided with inclined surfaces cooperating with inclined surfaces provided on the inner side of said sleeve. In order to achieve pressure-sealed clamping, it is necessary to manually rotate the fastening member relative to the pressure conduit. Furthermore, pressure supply cannot be effected until the coupling operation has been finished.
The present invention is based on the task of providing a plug coupling in the case of which the coupling and decoupling operations are effected by means of the pressure medium supplied and in the case of which the pressure medium is prevented from flowing out of the pressure conduit in the decoupled condition.
In accordance with the invention, this task is solved by a plug coupling having the features of the characterizing clause of patent claim 1.
In the various positions of the sleeve which is adapted to be axially displaced on the cylindrical housing it is, on the one hand, possible to prevent the pressure medium from flowing out in the decoupled condition; and, on the other hand, the piston, which has pressure applied thereto, presses the clamping jaws together so that said clamping jaws can be inserted into the thread connection means. In another position of the sleeve, the pressure medium displaces the piston in the opposite direction and presses the clamping jaws into the thread, a passage of pressure medium to the pressure medium actuated device being permitted in an additional position. The displacement of the sleeve takes place in the direction of coupling and decoupling, respectively, so that a smooth process is obtained.
Preferred embodiments of the plug coupling according to the invention are characterized in the subclaims.
U.S. Pat. No. 2,388,179 describes a plug coupling in the case of which the clamping jaws are pressed together by manually pushing a ring, which runs on inclined surfaces, in the direction of the thread connection means.
The plug coupling according to the invention is particularly suitable for coupling a pressure conduit to pressure medium actuated devices which are to be tested.
Embodiments of the plug coupling according to the invention will now be described while making reference to the drawings, in which
FIG. 1 shows a longitudinal section through a first embodiment of the plug coupling according to the invention,
FIGS. 2a to 2e show, in a schematic representation, the various functional positions of the plug coupling according to FIG. 1,
FIG. 3 shows a longitudinal section through a second embodiment of the plug coupling according to the invention, and
FIGS. 4a to 4e show, in a schematic representation, the various functional positions of the plug coupling according to FIG. 3.
Optimum way of carrying out the invention:
According to FIG. 1, a cylindrical member 1 is connected to a cylindrically designed core 3 in a pressure-sealed manner, preferably via a thread 13 and a sealing means 14. In the interior of the cylindrical member 1, a fastening member 2 is guided in a longitudinally displaceable manner on a pin 5 which is centrally fastened in the end face 16 of the core 3. One end face 17 of the fastening member 2 defines together with the end face 16 of the core 3 and together with an enlarged cylindrical bore 18 in the cylindrical member 1 a first cylinder space 15, the end face of the fastening member 2, which has a pistonlike configuration, being guided by means of a seal 19 in a pressure-sealed manner in the direction of the cylindrical bore 18.
The cylindrical member 1 is provided

REFERENCES:
patent: 1850879 (1932-03-01), Hunt
patent: 2533637 (1950-12-01), Tear
patent: 3291442 (1966-12-01), Cranage
patent: 3727952 (1973-04-01), Richardson
patent: 3757836 (1973-09-01), Masuda

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