Device for forming of thermoplastic products equipped with under

Details Device for forming of thermoplastic products equipped with under Device for forming of thermoplastic products equipped with under

1987-06-06

1989-04-18

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

249 59, 249 78, 249 79, 249122, 249184, 425547, 425556, 425577, 425DIG13, B29C 3938, B29C 3934, B29C 4140

Patent

active

048222704

ABSTRACT:
Apparatus for molding a thermoplastic tubular product such as a bushing having an internally threaded major diameter portion and an integral truncated minor diameter portion. A mold provided with a mold shell which jointly with a two-part mold core defines a mold cavity having a shape complementary to the shape of the molded bushing. The molded bushing has an internal undercut in the form of a thread in the major diameter portion thereof. The mold core is made as a core pin and an externally threaded sleeve of greater diameter than the core pin circumferentially of a portion of the core pin. Provision is made for moving the mold elements relatively to define the mold cavity and to effectively release the core by axial compression of the molded product while exposed on the mold core to cause it to swell radially outwardly and release the externally threaded core which forms the internal thread on the molded bushing.

REFERENCES:
patent: 2306205 (1942-12-01), Crosman
patent: 2336423 (1943-12-01), Rieser
patent: 2363808 (1944-11-01), Sayre
patent: 2410510 (1946-11-01), Lester
patent: 2513216 (1950-06-01), Sullivan et al.
patent: 4496302 (1985-01-01), Brown

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