Hinged lid latching mechanism

Details Hinged lid latching mechanism Hinged lid latching mechanism

1995-06-07

1997-01-21

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

Plural wear or shaping surfaces mounted for alternative use

83690, 83955, 425292, B29C 5132

Patent

active

055957692

ABSTRACT:
The invention relates to a mold apparatus and a process for forming a lid latching mechanism in a thermoplastic container. The lid latching mechanism features a large, trapezoidally-shaped opening hole. The trapezoidal shape has been found to reduce the amount of tearing that can occur along the edges of an opening formed during the thermoforming process. The opening is created by the engagement between a fixed shear key mounted in a first mold member and a movable shear key which has a trapezoidally-shaped cutting surface and is mounted in a second mold member. The movable key travels along an inclined path as the mold members close on a preheated thermoplastic sheet to form a container.

REFERENCES:
patent: 3862817 (1975-01-01), Dahlberg
patent: 4155692 (1979-05-01), Kermoian
patent: 4446088 (1984-05-01), Daines
patent: 4612153 (1986-09-01), Mangla
patent: 4909721 (1990-03-01), Warburton
patent: 5140882 (1992-08-01), Hyder
patent: 5162123 (1992-11-01), Grimes

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