Injection molding tool with retractable bead-forming segments

Details Injection molding tool with retractable bead-forming segments Injection molding tool with retractable bead-forming segments

1991-10-30

1993-06-08

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

249 63, 249178, 249180, 249185, 264318, 425442, 425577, 425DIG58, B29C 4544

Patent

active

052177319

ABSTRACT:
An injection-molding tool for producing pipe fittings with an internal groove has bead-forming segments of the core alternating with one another on respective bell crank levers at alternating bell-crank levers being fulcrummed at fixed locations on a core sleeve while the other bell-crank levers are fulcrummed on a ring movable axially on the core sleeve. The actuator is a hydraulically or pneumatically moved actuating sleeve having grooves or slits receiving radial arms of the levers with abutments or end surfaces axially staggered so that one group of segments is retracted inwardly and axially first to allow the second group of segments to be swung inwardly.

REFERENCES:
patent: 4456214 (1984-06-01), Ruck et al.
patent: 4708632 (1987-11-01), Mitteregger et al.
patent: 4848718 (1989-07-01), Harrison

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