US 5,326,072 AGranted

Plug-in safety coupling, in particular for compressed air lines

AssigneeHans Oetiker AG Maschinen- und Apparatefabrik

InventorAlbrecht Wuthrich

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Abstract

A plug-type safety coupling for pressures lines comprising a plug, a housing comprising a one-piece shaped part, a blocking element sealably mounted and secured within the housing, the blocking element being rotatable between a blocking position and a working position and having one of a cylindrical and a slightly conical shape. The blocking element is provided with a bore, which bore forms a bush for the plug, the bush comprising two sequential axial borings having different diameters. The material surrounding the smaller diameter axial boring forms an annular groove in communication with the larger diameter axial boring, the annular groove adapted to sealingly accommodate the plug, a seal between the plug and the bush being disposed between an outer surface of a nipple enclosed by the annular groove and an inner side surface of the plug. The blocking element is sealed against the housing by a loop seal disposed within a groove in the surface of the blocking element or a groove disposed in the inner surface of the housing.

Claims23

Dependent claims

A plug-type safety coupling for pressure lines comprising:

a plug (20) and a coupling barrel (1) having a housing (2;37), a blocking element (10) sealably mounted and secured within said housing (2;37), said blocking element (10) rotatable between a blocking position and a working position, said housing (2;37) comprising a one-piece shaped part that can be screwed on to a pressure line end piece, said blocking element (10) having a bore (11,46) passing through it, said bore (11;46) forming a bush (51) for the plug (20), said bush (51) comprising two sequential axial borings (52,53) with different diameters, and forming an annular groove (54) surrounding said smaller diameter axial boring (53) in communication with said larger diameter axial boring (52), said plug (20) sealably fitting into said annular groove (54), a seal (55) between said plug (20) and said bush (51) disposed between an outer surface (56) of a nipple (57) enclosed by the annular groove (54) and an inner side surface (58) of the plug (20), and said blocking element (10) sealed against the housing (2;37) by means of a loop seal (19;43;47) having at least one loop, said loop seal disposed within a corresponding groove (25;34;42) in one of the surface of the blocking element (10) and the inner surface of the housing (2;37).

Dependencies are inferred from the claim text.