Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1992-05-14
1993-08-31
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
26432811, 26432812, 422100, 425468, 425577, B29C 4577
Patent
active
052403971
ABSTRACT:
The invention includes a system for producing a monolithic injection molded pipette including a mold having an elongate cavity enclosing a prolate core, both cavity and core having tapered ends, paired retractable locking pins for stabilizing the core, solonoid drives for extending and retracting the pins, a resin source for for injecting resin into the cavity, and a controller for retracting the pins as injected resin flows along the core to the space proximate the pins. The invention includes a method for making a pipette including enclosing an elongate, tapered core in a mold having a prolate, tapered cavity to accept the core, extending paired locking pins to stabilize the core, injecting resin into the cavity and sequentially retracting the locking pins as the resin flows in the cavity proximate the pins. The pipette according to this invention is an injection molded monolithic structure comprising an elongate tube and a tapered tip formed integrally with the tube.
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Faulkner Michael T.
Fay John E.
Biomedical Polymers, Inc.
Heitbrink Tim
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