US 6,149,420 A · Mold with indicia forming changeable core

Abstract

A core mold that has a mounting hole on its molding surface and a changeable indicia forming section that is used to form markings on an external surface of injection molded products. The indicia forming section is located on one end of a changeable indicia forming insert. The insert is detachably inserted into the mounting hole of the core mold. A step is also used to prevent the changeable indicia forming insert from moving relative to the core mold. The changeable indicia forming insert is detachably inserted to the core mold so that the indicia forming section is easily changeable by changing the insert. This avoids the delays caused by using core molds and inserts bearing indicia forming sections that are integrally formed from a unitary piece of material. Additionally, the information conveyed by the markings is greater than that possible using core molds with rotary cores. The mold of the present invention improves work efficiency during the manufacturing process by reducing the delay caused by changing indicia forming inserts. This leads to a corresponding reduction in production costs and allows products to be sold at more competitive prices. Furthermore, the markings formed by the present invention are all relevant to the product produced, as opposed to the marks created by rotary cores, thus eliminating potential consumer confusion. This invention is applicable to any molding processes, such as die-casting, plastic injection molding, and metallic injection molding.

Claims10

Dependent claims

A mold, comprising:

a cavity mold comprising a first plate having a recess forming a first molding surface;
a core mold comprising a plug having a second molding surface and being selectively engageable with said recess in said cavity mold to form a molding cavity between said core mold and said cavity mold, said core mold having a hollow extending from said second molding surface through said plug to an outer surface opposite from said second molding surface, said hollow in said core mold having a step on one side of the hollow, and having a larger cross-sectional area at said outer surface than at said second molding surface;
a column bearing an indicia forming segment on a distal end and being insertable into said hollow from said outer surface, said column being integral and said distal end of said column being flush with said second molding surface and causing said indicia forming segment to protrude into said molding cavity, said indicia forming segment forming a plurality of markings on an outer surface of a molded product;
securing means for preventing said column from moving relative to said second molding surface;
a first clamp plate secured to said outer surface of said core mold;
a second clamp plate secured to an exterior surface of said cavity mold opposite from said first molding surface and having a sprue for guiding a plurality of molten material into said molding cavity;
and
a clamp detachably joining said first clamp plate to said second clamp plate.

5 more elements

Dependencies are inferred from the claim text.

Mold with indicia forming changeable core

Life of this patent

Mold with indicia forming changeable core

Life of this patent

Abstract

Claims10