US 4,448,447 A · Coupling for pressure lines

Abstract

A coupling includes a receiving part having an external thread which can be crewed into a threaded bore and includes a plug-in part, which can be plugged into and coupled to the receiving part. A retaining ring is secured to the front end of the receiving part, for example through engagement with a groove in the receiving part, and during plugging in of the plug-in part engages a groove provided in the plug-in part. Widening of the retaining ring is limited by the wall of the threaded bore. By unscrewing the receiving part from the threaded bore, the retaining ring can be released by widening it at an interrupting slot, after which the plug-in part can be removed from the receiving part. The coupling is short, which is achieved in such a manner that, due to the arrangement of the retaining ring at the front end of the receiving part, the entire length of the receiving part can be used as a guide for the plug-in part.

Claims19

Dependent claims

A coupling adapted to connect a pressure line to a member having a threaded hole therein, comprising a receiving part having a hole therethrough and having an external thread which can be screwed into said threaded hole in said member, a plug-in part having a hole therethrough and slidably received in said hole through said receiving part, and an elastically expansible retaining ring which lockingly engages said plug-in part and said receiving part so as to fix said plug-in part and said receiving part against relative movement in an axial direction;

said retaining ring being located near one end of said receiving part, extending over a surface on said one end of said receiving part, having a portion which engages an external groove provided in said plug-in part, and having projections thereon which engage recesses provided in said receiving part;
and wherein said recesses are straight grooves and said projections are tangential webs which are offset with respect to one another by equal angular intervals.

A coupling, comprising:

a generally cylindrical receiving part having a central portion between its ends which has an outwardly projecting external thread on an exterior surface thereof, having a generally cylindrical hole therethrough substantially coaxial with said exterior surface of said central portion, and having at one end thereof an end portion which has an outside diameter smaller than the outside diameter of said central portion;
a plug-in part having a generally cylindrical exterior surface which has an outside diameter approximately equal to the inside diameter of said hole through said receiving part, having an axially extending opening therethrough, and having a circumferentially extending groove in said exterior surface thereof, said plug-in part being slidably receivable within said hole through said receiving part;
and a resiliently expansible retaining ring having a first portion which encircles and is fixed against axial movement relative to said end portion of said receiving part, a second portion which extends axially from said first portion past said one end of said receiving part, and a third portion which extends inwardly from the end of said second portion remote from said first portion, said third portion of said retaining ring engaging said groove in said plug-in part when said plug-in part is slidably received in said hole through said receiving part, said first portion of said retaining ring having an outside diameter which is larger than the outside diameter of said third portion of said retaining ring, and said third portion of said retaining ring being resiliently expansible relative to said first portion;
and wherein the difference between the outside diameter of said first portion of said retaining ring and the outside diameter of said exterior surface of said central portion of said receiving part is less than the difference between the inside diameter of said third portion of said retaining ring and the outside diameter of said plug-in part in the region of said groove therein.

1 more element

Dependencies are inferred from the claim text.

Coupling for pressure lines

Life of this patent

Coupling for pressure lines

Life of this patent

Abstract

Claims19