Expandable core for injection molding

Details Expandable core for injection molding Expandable core for injection molding

1977-10-26

1978-12-19

Briggs, William R.

Static molds

Core

Including means to expand or contract core

164345, 249 59, 249178, 425417, 425DIG58, B28B 730, B29C 112, B29D 100

Patent

active

041302648

ABSTRACT:
An expandable core for forming an internal recess in a molded part, composed of a stationary core pin having a generally conical outer surface and a segmented sleeve composed of two groups of lateral slides disposed around the pin with the slides of one group alternating with the slides of the other group. The conicity of the pin outer surface and the slide guidance along the pin are identical for all slides of the same group but are different from one group to the other.

REFERENCES:
patent: 3373460 (1968-03-01), Ladney, Jr.
patent: 3373479 (1968-03-01), Watt et al.
patent: 3528637 (1970-09-01), Bedford, Jr.
patent: 3660001 (1972-05-01), Roehr

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