Plastic article or earthenware shaping or treating: apparatus – Mold opening and closing means and segmented female mold – Rack and pinion
Patent
1977-06-28
1979-05-15
Briggs, William R.
Plastic article or earthenware shaping or treating: apparatus
Mold opening and closing means and segmented female mold
Rack and pinion
249162, 425338, 425581, B29C 116
Patent
active
041545664
ABSTRACT:
A stack mold stabilizer for causing the multiple mold plates of a stack mold to maintain their required even spacing at all times during operation. The stabilizer includes a rack and pinion mechanism for maintaining an equal distance between the mold plates of the stack mold. The stack mold includes at least three mold plates with the mold plate at one end being fixed and having a first rack gear fixedly mounted to its side. The center mold plate has a pinion gear rotatably mounted thereon. The teeth of the pinion gear are maintained in firm meshing engagement with the teeth of the first rack gear by a first idler roller mounted on the center mold plate. The third mold plate has a second rack gear fixedly mounted to its side and has teeth which are kept in firm meshing engagement with the pinion gear by a second idler roller mounted on the center mold plate. The third mold plate is reciprocally driven by a suitable driving source and the rack and pinion gears maintain the distance between opposed faces of adjacent mold plates equal during the reciprocating movement to consistently seal at the parting line therebetween when the mold plates are in position to receive a charge of plastic material.
REFERENCES:
patent: 829380 (1906-08-01), Ball
patent: 1335525 (1920-03-01), Patterson
patent: 2349805 (1944-05-01), Tapper
patent: 2375252 (1945-05-01), Sayre
patent: 2596602 (1952-05-01), Roddenbery, Jr.
patent: 3650653 (1972-03-01), Erickson
Briggs William R.
El Mar Plastics, Inc.
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