Compensating core pin for plastic injection molds

Details Compensating core pin for plastic injection molds Compensating core pin for plastic injection molds

1982-09-30

1984-06-05

Pavelko, Thomas P.

Static molds

Core

249 68, 249142, 425107, 425577, B29C 106

Patent

active

044524200

ABSTRACT:
A core pin for use in a plastic injection mold for forming a hole through a part as it is formed in the mold. A shaft is longitudinally slidable in one of the base members of the mold and extends through the cavity of the mold and abuts the inner face of the opposing base member. A spring biases the shaft toward the second base member. When the mold is open the shaft has a small amount of positive clearance. When the mold closes the spring is compressed and the shaft has zero clearance against the inner face of the second base member, regardless of dimensional changes of the mold.

REFERENCES:
patent: 2134829 (1938-11-01), McWane
patent: 2237606 (1941-04-01), McWane
patent: 2361348 (1944-10-01), Dickson et al.
patent: 2440144 (1948-04-01), Hosking
patent: 2508865 (1950-05-01), Lund
patent: 2607080 (1952-08-01), Stewart
patent: 2822578 (1958-02-01), Lobell
patent: 2825093 (1958-03-01), High
patent: 3060509 (1962-10-01), McCubbins, Jr.
patent: 3315317 (1967-04-01), Winkler

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