Valves and valve actuation – With correlated flow path – Pipe coupling or union
Patent
1998-01-13
1999-11-16
Lee, Kevin
Valves and valve actuation
With correlated flow path
Pipe coupling or union
2511496, 285315, F16L 3728
Patent
active
059842652
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
This invention relates to hose couplings and, in particular, to hose couplings having a male part, a female part, and an angular locking body insertable into the female part and being extendable into the male part when influenced by a sleeve.
A hose coupling usually has a male part and a female part, which is equipped with a non-return valve, which is opened by insertion of the male part. The male part is provided with a circumferential groove, which interacts with at least one locking body in the female part. The locking body traditionally is a round ball, which is surrounded by a sleeve which is axially displaceable on the female part.
Swedish patent 470 452 describes a hose coupling wherein the locking is completed with at least one balanced locking pawl, which is also surrounded by the sleeve and primarily retains the introduced male part. At disconnection the locking pawl is first released, and the ball grips after a short displacement in the male part. This makes it possible to blow of the fluid pressure present in the hose between the coupling and a connected tool without disturbing noises.
The locking body groove in different makes has a somewhat varying position in relation to the opening of the male part nipple, and in some embodiments it is difficult to retain the balls in the coupling. High pressures make it important to increase the material thickness, which means that the diameter of the ball must be increased. This causes the ball to have a poor grip in the groove.
SUMMARY OF THE INVENTION
The present invention refers to hose couplings of the type described in the introduction and provided with means for pressure relief at disconnection and it is characterized therein that the locking body is angular, with one portion, which is insertable in an axial groove in the female part, and has such a length that always at least has nay part thereof surrounded by the sleeve, and another, inwardly directed portion, which has such a length that it extends into the groove in the male part when the locking body is influenced by the sleeve.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described hereinafter with reference to the enclosed figures, wherein
FIG. 1 shows a known embodiment of a hose coupling,
FIGS. 2 & 3 show the encircled area of FIG. 1, at increased material thickness and different sizes of the locking ball,
FIG. 4 shows a perspective view of a locking body according to the invention,
FIG. 5 shows a part of the female part with a groove for the locking body, and
FIGS. 6 & 7 show the encircled area in FIG. 1, with an angular locking body according to the invention in different coupling positions.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a hose coupling according to the embodiment known from the patent 470 452. It has a male part 10 and a female part 11. The nipple of the male part, which is insertable into the female part, is provided with a circumferential groove 12. The female part is provided with a slide-shaped, spring-loaded non-return valve 13 and is surrounded by a likewise spring-loaded sleeve 14.
This is provided with an internal, circumferential groove 15. The sleeve 14 guides on one hand at least one balanced locking pawl 16, and on the other hand at least one locking body 17 in form of a round ball. When the male part is completely enclosed in the female part, the sleeve 14 urges the locking pawl 16 to engagement in the groove 12 of the male part, thus that the male part is securely retained. In the position shown in FIG. 1 the sleeve 14 has been retracted thus much that the locking pawl has released its grip in the male part groove. The male part then can be pulled outwards somewhat thus that there is a play 18 between the male part and its non-return valve, which is pushed forward by its spring. In this position the slide 14 keeps the ball 17 pressed down into the groove 12 thus that the male part is withheld during the time the over pressure in the hose part connected to the male par
REFERENCES:
patent: 4681350 (1987-07-01), Gaita
patent: 5290009 (1994-03-01), Heilmann
patent: 5547166 (1996-08-01), Engdahl
Hochberg D. Peter
Holt William H.
Lee Kevin
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