Forming device with first and second material proportioning mean

Details Forming device with first and second material proportioning mean Forming device with first and second material proportioning mean

1973-10-18

1976-03-09

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

222309, 264310, 425130, 425429, B29C 504

Patent

active

039429245

ABSTRACT:
A forming device and method is disclosed herein that is particularly useful for forming large parts of polyurethane material. The forming device includes a proportioner that meters relative amounts of materials through separate supply sources to a mixer where the materials are combined and then supplied to a mold, the mold being then rotated to displace the materials throughout the mold to form therefrom a part having a preselected shape. Where the materials to be combined are polyurethane components, the components are combined and quickly supplied to the mold to displace and cure the part while in said mold. The proportioner has a fixed bar and a movable bar centrally pivoted on the fixed bar with metering pistons mounted between the bars at opposite sides of the pivot junction, the movable bar being pivoted by a power actuator that includes power pistons mounted adjacent to the metering pistons and between the movable and fixed bars to pivot the movable bar, pivotal movement in one direction causing materials to be drawn into the cylinders of the metering pistons and pivotal movement in the opposite direction causing material to be ejected from the cylinders of the metering pistons to the mixer in a predetermined precise ratio of materials.

REFERENCES:
patent: 2792614 (1957-05-01), Altschuler
patent: 2946488 (1960-07-01), Kraft
patent: 3474165 (1969-10-01), Rakes et al.

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