Device for gripping and pulling softened plastic sheet at front

Details Device for gripping and pulling softened plastic sheet at front Device for gripping and pulling softened plastic sheet at front

1989-01-26

1990-07-31

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Coacting shaping surfaces

264291, 264292, 264319, 264322, 425403, 4254031, B29C 5104

Patent

active

049446681

ABSTRACT:
A device for gripping and pulling a length of thermoplastic sheet softened to be moldingly formed at the front and rear edges, which are otherwise inevitably made to be concave, so as to hold edges substantially straight. The device uses at least two pairs of lower and upper gripping members arranged to be vertically movable so as to grip the above front and rear edges. Two pairs of pull levers each cooperating with one of the pair of lower and upper gripping members operate so as to grip the front and rear edges in advance of the gripping by the gripping members and pull to straighten the concaved edges which are then gripped by the gripping members.

REFERENCES:
patent: 3466706 (1969-09-01), Asano
patent: 3827683 (1974-08-01), Seborg et al.
patent: 4555377 (1985-11-01), Whiteside et al.

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