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Shock Absorber for Plastic Injection Molds

IP.com Disclosure Number: IPCOM000062688D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Schaefer, WH: AUTHOR

Abstract

In molding operations where floating plates are required, shock absorber assemblies are utilized to reduce the noise and possible plate damage when the plates are clamped in the press operation. A number of plate configurations are possible. To illustrate the shock absorber principle, a single possible configuration is shown in Fig. 1 where only the cavity portion of the entire mold is shown. Cavity mold 10 (Fig. 1) consists of a back-up (clamp) plate 11 containing a sprue 12 and leader pins 13 on which a cavity plate 14 is free to float. Cavity plate 14 contains part cavity 15 and runner 16 with one or more gate drops. For simplicity, other necessary plate components, such as stripper pins and stop pins, are not illustrated.

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Shock Absorber for Plastic Injection Molds

In molding operations where floating plates are required, shock absorber assemblies are utilized to reduce the noise and possible plate damage when the plates are clamped in the press operation. A number of plate configurations are possible. To illustrate the shock absorber principle, a single possible configuration is shown in Fig. 1 where only the cavity portion of the entire mold is shown. Cavity mold 10 (Fig. 1) consists of a back-up (clamp) plate 11 containing a sprue 12 and leader pins 13 on which a cavity plate 14 is free to float. Cavity plate 14 contains part cavity 15 and runner 16 with one or more gate drops. For simplicity, other necessary plate components, such as stripper pins and stop pins, are not illustrated. To avoid clashing of floating cavity plate 14 against back- up plate 11 during press operation, shock absorber assemblies 16 are inserted symmetrically into holes drilled into either floating cavity plate 14 or back-up plate 11 in the non-cavity areas. Two or four shock absorber assemblies can be utilized depending on the plate size. Shock absorber assembly 16 and its installation are shown in Fig. 2.

Assembly 16 consists of a cylindrical housing 17 containing in its core protruding contact pad 18 of a suitable material, such as nylon.

Contact pad 18 rests on spring 19 of a size suited to the press pressure and mold plate weights. Plate 20 retains pad 18 and spring 19 in

(Image Omitted)

housing 17 w...