Mold apparatus

Details Mold apparatus Mold apparatus

1998-10-01

2001-04-10

Pyon, Harold (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

C425S195000, C425S234000, C425S236000, C425S556000, C425S330000, C425S438000, C425S443000, C425S4360RM, C425SDIG005

Reexamination Certificate

active

06213753

ABSTRACT:

FIELD OF THE INVENTION
This invention is related to molding, and more particularly to an improved mold and a method of forming the mold.
BACKGROUND OF THE INVENTION
Molds used to form plastic parts such as electrical connector housings and other articles are generally formed by machining a pair of mold plates resulting in a negative image of the surfaces to be molded. Electrical connector sockets frequently have flat surfaces populated with large numbers of apertures for receiving electrical contacts. Molds for such parts may have several thousand openings formed in the mold parts to receive core pins around which plastic may be formed. The core pins result in recesses or openings formed in the article to be molded. The mold plates are then placed and secured into opposed mold holders or frames. The pair of mold holders are held together and molten material is injected therebetween to form the molded article. The mold holders are then separated to eject the molded article from the mold. Forming of the mold plates is typically a labor intensive process since a negative image of the article to be molded and a large number of core pins must be precisely machined into the surface of the plate.
A problem exists with the present method of making molds in that forming of the mold plate and the multitude of core pins is a labor intensive precision machining process. It is therefore desirable to simplify the process of creating a mold in a precise manner without the need for a labor intensive process and without the individual core pins.
SUMMARY
It is therefore an object of the present invention to provide a method of making a mold which reduces the labor intensity and skill required to form the mold. It is yet another object of the present invention to provide a mold which can be accurately formed without the need for a labor intensive machining process.
This invention provides a method of forming a mold including the steps of segmenting a surface to be molded into discrete adjacent sections, forming a profile of each section on an edge of a planar or arcuate material, and; stacking each profile such that their edges form the surface to be molded.


REFERENCES:
patent: 2664593 (1954-01-01), Larson
patent: 4706924 (1987-11-01), de Larosiere
patent: 5217728 (1993-06-01), Grabbe

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