Valves and valve actuation – With means for blocking or disabling actuator
Patent
1991-11-08
1993-08-24
Schwadron, Martin P.
Valves and valve actuation
With means for blocking or disabling actuator
251354, 285 86, 285316, F16K 3100
Patent
active
052382214
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a plug-in coupling for hoses comprising a sleeve, into which a hose stem is sealingly insertable, a U-shaped, elastically deformable locking element held on the sleeve for displacement at right angles to its longitudinal axis, this locking element engage with its two arms behind a projection on the hose stem and thereby preventing its withdrawal, and wedge surfaces arranged on the sleeve, the two arms of the locking element abutting on these wedge surfaces and being spread elastically apart by the wedge surfaces during displacement of the locking element to such an extent that the hose stem is released.
A plug-in coupling for hoses of this type is known from DE-OS 34 40 753. The locking element is, in this case, designed as a narrow bracket, the crosspiece of which penetrates through a groove extending over a portion of the circumference of the sleeve. Due to this construction, the user has only a small pressure surface for displacement of this locking element and so operation is made more difficult Moreover, the crosspiece of the bracket-like locking element must protrude beyond the outer circumferential surface of the sleeve and so not only are sharp edges formed but parts which are movable relative to one another are exposed and can perhaps be actuated unintentionally.
The object of the invention is to develop a generic plug-in coupling further so that these disadvantages are avoided and a simplified operation is possible
This object is accomplished according to the invention, for a plug-in coupling for hoses of the type described at the outset, in that the locking element is formed by a U-shaped housing with an upper wall and two side walls, which surrounds the sleeve essentially over its entire length, that the arms are projections formed on the side walls and that the upper wall of the housing is designed as a pressure surface.
With this construction, the sleeve is surrounded again by a housing, which has substantially smooth outer surfaces so that no sharp edges or parts movable against one another are arranged on the outside. Moreover, the entire upper wall of the housing can be used as a pressure surface and so the user of the coupling can release the parts inserted into one another in a simple manner due to pressure on the upper wall of the housing. This substantially simplifies operation and it is no longer necessary to search for the appropriate pressure surface.
It is particularly advantageous for the arms of the housing to engage in lateral slots of the sleeve and hereby mount the housing on the sleeve so as to be non-displaceable in the longitudinal direction but displaceable transversely thereto. The housing is held on the sleeve merely by this engagement of the arms in the slots. Apart from being secured in position in axial direction, the housing is also secured against any tilting relative to the longitudinal axis of the sleeve. The slots engaging in the arms therefore form a sliding guide means for the housing, by which the housing is displaceable only in one plane at right angles to the longitudinal axis of the sleeve.
In this respect, it is possible, in particular, for the arms to be adapted to be elastically bent out to such an extent that they exit out of the slots in the sleeve. Due to the arms being bent out, the housing can be separated again from the sleeve, or rather housing and sleeve can, in the reverse case, be assembled by the housing being elastically pushed onto the sleeve and the arms then locking into the slots due to their intrinsic elasticity.
It is particularly favourable for the projections to be inwardly protruding, strip-like wall regions These can, in particular, be designed as parts of an end wall.
The housing can also be closed on the opposite side by means of an end face which has a through opening for a hose connection coaxial to the longitudinal axis of the sleeve. In this way, the housing is additionally supported when the hose connection is inserted since it surrounds the hose connection like a ring. This does not prevent a displac
REFERENCES:
patent: 2631872 (1953-03-01), Wurmser
patent: 2855946 (1958-10-01), MacKal
patent: 3588149 (1971-06-01), Demler et al.
patent: 3858910 (1975-01-01), Oetiker
patent: 4260130 (1981-04-01), Brehm
patent: 4561682 (1985-12-01), Tisserat
patent: 4591192 (1986-05-01), Van Exel et al.
Langer Peter
Schwaderer Christian
Alfred Karcher GmbH & Co.
Lee Kevin L.
Lipsitz Barry R.
Schwadron Martin P.
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