CH681558A5 - Water supply pipe safety connection - includes fitting carrying sealing ring and incorporating locking lug or hooked lug engaging teeth on outer cap - Google Patents

Abstract

To form a connection between a straight (4) or curved (5) fitting and a water supply pipe, a flanges part of the fitting is clamped by a locking cap (1) against the shouldered end of the pipe (A or P). Projecting from the fitting (5) is a hooked lug (5') which engages teeth (2) or serrations on the outside of the cap, around its central opening, to give a locking action. In an alternative design, the fitting (4) has a tongue projecting from its surface to engage a groove inside the cap, to give a locking action. USE/ADVANTAGE - Particularly for plumbing applications. A good seal is maintained where vibration is present and the joint has remained dry over long periods of time.

Description

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CH 681 558 A5

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Description

The present invention relates to a safety fitting for hydraulic pipes in general and in particular for those intended for connection to washing machines, dishwashers, irrigation water networks, hydraulic connections, in order to avoid water or liquid leaks caused by loosening of the parts making up the fitting, due to the vibrations and the drying of the seals.

The current fittings, for example those intended for connection to washing machines and dishwashers, generally include an internally threaded hexagonal cap screwed onto the incoming water pipe and a complementary mushroom-shaped tubular part, arranged so that by screwing the cap fully the complementary part strongly compresses the interposed flat gasket.

In the long run, both for the drying of the flat seal interposed in periods of inactivity, and for the loosening of the cap due to the vibrations of the washing machines or dishwashers, there may also be significant losses of liquid, which is not tolerated especially in the case of washing machines and dishwashers which are generally located in domestic environments.

This drawback is completely avoided with the safety fitting according to the present invention, characterized by that between the end of a conduit (A, fig. 7) to be connected and the complementary parts (A and 1- fig. 7, respectively 4 and 8) anti-unscrewing means, toroidal gaskets are mounted on said end of the pipe, collaborating with the end of the duct and the complementary parts.

The enclosed drawings represent some preferred forms, not limiting nor binding of embodiment of the invention.

- fig. 1a represents, in axial section, a first embodiment of the cap according to the present invention;

- fig. 1b represents its top plan view;

- fig. 1c the plan view from below;

- the figs. 2a, 2b, 2c represent a second embodiment of the cap according to the invention;

- the figs. 3a, 3b, 3c a third embodiment of the cap according to the invention;

- the figs. 4a, 4b, 4c, 4d represent in axial section and in the various views a particular embodiment, according to the invention, of the rectilinear part, of the fitting which is screwed onto the pipe which belongs to the washing machine, dishwasher, etc .;

- the figs. 5a, 5b, 5c, 5d represent a curvilinear shape of the fitting;

- the figs. 6a, 6b, 6c represent a different embodiment of the fitting in question;

- fig. 7 shows in axial section the complete fitting according to the invention, connected to the arrival duct (A) and the departure duct (P).

With reference to figs. 1a, 1b, 1c, the cap 1, which can be made of metal or plastic, is externally made in the form of a nut or having protrusions or knurls so as to be able to screw it with a key on the incoming duct A (fig. 7). Above said cap has indentations or, better, anti-unscrewing serrations 2, protruding so that meeting the surface of the complementary piece on which they press, or a stop member (5 'fig. 5a and fig. 7) prevent mutual unscrewing even in case of strong vibrations.

To avoid the inconveniences presented by current flat gaskets, which are subject to drying and therefore to withdrawal during long periods of inactivity, with consequent loosening of the two parts of the fitting (1 and 4 or 1 and 5), according to the invention the use of a circular toroidal or circular annular elastic gasket 6 (figs. 5a, 6a) which constantly maintains the seal even if the various parts become loose.

In this way, all the sealing safety of the fitting is obtained even for very long periods of operation.

Additional teeth 2 '(figs. 1 b, 2b, 3b) can possibly collaborate with the internal cylindrical surface 4 "(fig. 5a) to obtain the same effect as the protruding surface indentations 2 (fig. 1a) or recessed 2 (fig . 2a).

In Figs. 6a, 6b, 6c, 6d represents a variant according to which the anti-unscrewing means is constituted by a leaf spring 7 bent so as to allow the two complementary parts to be screwed, but not unscrewed.

It is envisaged that the shape of the various parts making up the fitting and that of the indentations may vary and in any case be located, without departing from the scope of protection of the patent.

Claims (7)

claims 1. Safety fitting for hydraulic pipes in general and in particular for those intended for connection to washing machines, dishwashers, irrigation water networks, hydraulic connections, in order to avoid water or liquid leaks caused by the loosening of the parts making up the connection due to the vibrations and the drying of the gaskets characterized by that anti-unscrewing means are mounted between the end of a conduit to be connected (A and 1- fig. 7, respectively 4 and P) to said ends of the pipe (2 , 2 '), toroidal gaskets (6) collaborating with the end of the duct and the complementary parts. 2. Fitting according to claim 1, characterized in that said complementary parts are rectilinear (4) or curvilinear (5) and that said anti-unscrewing means consist of serrations and / or indentations (2, 2 'figs. 1b, 2b, 3b , 4c) engaging in complementary parts to avoid loosening. Connection according to claim 2, characterized in that a cap (1) has anti-unscrewing indentations (2 fig. La) arranged according to a plane orthogonal to the axis and protruding superficially. 4. Fitting according to claim 2, characterized in that a cap has some 5 10 15 20 25 30 35 40 45 50 55 60 65 2 3 CH 681 558 A5 anti-unscrewing indentations (2 fig.2a) arranged according to a plane orthogonal to the axis and recessed. 5. Fitting according to claim 2 characterized in that a cap, respectively its complementary part (4 or 5), has further indentations (2 'figs. Ib, 4b, 4c) located on their cylindrical surface. 6. Fitting according to claim 1, characterized in that said anti-unscrewing means consist of an elastic tongue (7 figs. 6b, 6c) fixed on one of the complementary parts, so as to press on the other complementary part allowing the screwing but not unscrewing. 7. Fitting according to claim 1, characterized in that said anti-unscrewing means comprise serrations or serrations (2 fig. 7) engaged in retaining members (5 '). 5 10 15 20 25 30 35 40 45 50 55 60 65 3