Retractable mold protrusion assembly

Details Retractable mold protrusion assembly Retractable mold protrusion assembly

1992-04-27

1993-03-30

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

425457, B29C 3302, B29C 3334

Patent

active

051982447

ABSTRACT:
A retractable mold protrusion assembly for thermoforming parts is disclosed which is both self-contained and self-operating. The assembly includes a housing, a protrusion molding member moveably mounted to the housing, and an offset mounted spring. The protrusion molding member is movable with respect to the housing between a locked configuration and a pivoting configuration. When in its locked configuration, the protrusion molding member is securely held in a protruding position in which it protrudes away from the housing. In this position, a piece may be molded about the protrusion molding member to form a desired protrusion in the piece being formed. After molding has been completed, the removal of the molded piece slides the protrusion molding member into a second pivoting configuration, in which the protrusion molding member is pivotable into the housing to allow the molded piece to be completely removed. Continued movement of the molded piece away from the molding assembly then causes the protrusion molding member to pivot into the housing, thus allowing the molded piece to be completely removed. After the molded piece has been removed, the offset mounted spring acts to return the protrusion molding member to its protruding position and to lock it in place, where it is ready for the next subsequent molding operation.

REFERENCES:
patent: 4338070 (1982-07-01), Nava

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