Pipe expanding mandrel

Details Pipe expanding mandrel Pipe expanding mandrel

1989-02-14

1990-06-05

Jones, David

Metal deforming

Tool and/or tool holder

Having unitary tool-face

72370, 29727, B21D 4102

Patent

active

049303384

ABSTRACT:
A pipe expanding mandrel is disclosed which comprises a set pin having a pipe expanding billet mounted on a front end portion thereof and a stepped portion formed at a site behind the billet, a sleeve slidably fitted on a rear portion of the set pin, a spring interposed between the stepped portion of the set pin and the front end of the sleeve, and a mandrel body. An engagement protuberance formed on a rear end portion of the set pin is brought in engagement with an engagement hole bored in a front end portion of the mandrel body, and then the set pin is turned, so that the set pin and the sleeve are coupled to the mandrel body while being prevented from disengagement therefrom by the action of the spring. In conjunction with this coupling, engagement lugs formed at the rear end of the sleeve is brought in engagement with an engagement groove formed at the front end of the mandrel body, so that the set pin and sleeve are coupled to the mandrel body while being prevented from rotation by the action of the spring.

REFERENCES:
patent: 1235835 (1917-08-01), Nilson
patent: 3568303 (1971-03-01), Akio
patent: 4263713 (1981-04-01), Smith et al.
patent: 4573340 (1986-03-01), Kammeraad
patent: 4644775 (1987-02-01), Fuchs, Jr.
patent: 4779445 (1988-10-01), Rabe

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