Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1992-05-27
1993-08-24
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
264 407, 2643289, 425146, 425564, 425566, B29C 4523
Patent
active
052383784
ABSTRACT:
Valve gated injection molding apparatus for coinjecting and/or sequentially injecting two different fluids through a gate into a cavity. An elongated valve pin member is received in an elongated valve sleeve member in alignment with the gate and both are reciprocated rotatably as well as axially by separate actuating mechanisms to control the flow of the fluids through the gate. Each actuating mechanism has a piston driven rack member to provide rotary motion which is then converted to axial movement of the corresponding valve member between the retracted open and forward closed positions. In one embodiment, helical threads on the valve members engage fixed teeth extending inwardly from the surrounding nozzle to convert the rotary motion of each valve member to corresponding axial movement. Linear position transducers on the rack members provide for accurate control of the valve members. This accurate control and the reduction in force required by these rotary axial actuating mechanisms minimizes wear resulting from repeated seating of the valve members.
REFERENCES:
patent: 3947177 (1976-03-01), Eckardt
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 4789318 (1988-12-01), Ehritt
patent: 4917594 (1990-04-01), Gellert et al.
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