Molded one-piece weighing funnel

Details Molded one-piece weighing funnel Molded one-piece weighing funnel

1999-03-22

2001-01-30

Walczak, David J. (Department: 3751)

Fluent material handling, with receiver or receiver coacting mea

Filling means with receiver or receiver coacting means

Funnel type

C141S338000, C141S343000

Reexamination Certificate

active

06179022

ABSTRACT:

FIELD OF THE INVENTION
The invention resides in the general field of injection molds, for molding plastics.
SUMMARY OF THE PRESENT INVENTION
The mold of the invention includes a core construction for molding a shape that could not be molded by previously known molds.
The article to be molded is hollow, with opposite end openings smaller than the interior. In previous molds and core constructions, it was not possible to mold such an article in a single piece. It is desired to mold it as a single piece, and in a one-stop operation, to reduce costs of manufacture.
A broad object of the present invention is to provide injection mold/core construction having the following features and advantages. The molded article is hollow, or tubular, with small openings at its ends. The core is made up of a pair of parts fitted together, but moveable relative to each other in endwise direction. One of the core parts can be individually removed first, and then the other core part removed.
The core parts arc held in position in the cavity block in the mold, in which they are positioned.
As a consequence of the immediately forgoing feature, the molded article can be molded, and removed from the mold, in a minimum of time, thereby reducing costs of manufacture, and the molded article is in its final intended shape, eliminating the necessity for cutting away parts of the molded article, or for trimming it or otherwise treating it after it is removed from the mold.
The core parts are so positioned in the molding cavity that they form one end of the cavity, and thereby form one of the end openings of the molded article and the surrounding defining edges thereof.
The device is of such character, in position and function, that as used in an injection mold, injection parts can be positioned at any location in the mold cavity.


REFERENCES:
patent: 426165 (1890-04-01), Brittin
patent: 1644837 (1927-10-01), Johnson
patent: 5092471 (1992-03-01), Pinizzotto et al.
patent: 5168908 (1992-12-01), Boyum
patent: 5488979 (1996-02-01), McKenzie

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