US 4,730,856 AGranted

Pipe joint for connecting a pipe having a small diameter

AssigneeUsui Kokusai Sangyo Kabushika Kaisha

InventorKatsushi Washizu

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Abstract

A pipe joint for connecting a pipe having a relatively small diameter includes a generally cylindrical main body having an axial bore in which an end portion of the pipe and a plurality of seal rings surrounding the end portion of the pipe can be fitted. The main body has a tubular extension defining a connector for another tubular member to be connected to the pipe by the joint and having an axial bore which can be connected with that of the pipe. The main body also has a plurality of pawl projections or a shoulder on its outer peripheral surface. The pipe has a radially outwardly projecting wall portion near its end portion. A generally cylindrical cap has an end wall portion provided therethrough with a central opening through which the pipe can extend into the main body, and a plurality of resilient arms projecting from its end wall portion. Each arm has adjacent to its free end a hole in which one of the pawl projections on the main body can be received, or a pawl projection which is engageable with the shoulder on the main body. The end wall portion of the cap is engageable with the radially outwardly projecting wall portion of the pipe to hold the pipe in its properly connected position.

A pipe joint for connecting a pipe and a tubular member, said pipe comprising an end portion extending inwardly from one axial end of said pipe and further comprising a radially outwardly projecting wall portion adjacent the end portion of said pipe, said end portion being dimensioned to and receiving a plurality of annular seal rings thereabout, said pipe joint comprising:

a generally cylindrical main body having opposed first and second axial ends, and being characterized by an axial bore extending entirely therethrough, the first axial end of said main body defining a tubular extension dimensioned to connect with said tubular member, said axial bore of said main body being characterized by at least one annular step generally facing said first end of said main body and defining a smaller cross-sectional portion of said axial bore, the portion of said axial bore intermediate said annular step and said second end being dimensioned to receive both the end portion of said pipe and the annular seal rings mounted thereabout, said main body further comprising cap engaging means projecting from its outer peripheral surface;
a flanged bush comprising a generally cylindrical portion dimensioned to be received intermediate said main body and the end portion of said pipe and to retain said seal rings intermediate said annular step and the flanged bush, said flanged bush further comprising an outwardly extending annular flange dimensioned to abut against the second end of said main body;
a generally cylindrical cap having an end wall portion provided with a central opening dimensioned to permit the pipe to be extended therethrough, and a plurality of resilient arms projecting from said end wall portion, each of said resilient arms having a free end provided with means with which said cap engaging means of said main body is engageable, said end wall portion being engageable with said wall portion of said pipe to hold said pipe in a connected position relative to said main body, said end wall further surrounding at least the flanged bush and the second end of said main body to prevent intrusion of dirt to said joint.

Abstract

Claims5