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Injection Mold Design for Keyboard

IP.com Disclosure Number: IPCOM000045861D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Kightlinger, DA: AUTHOR

Abstract

The keys and key actuators of a low-cost keyboard are injection molded from a single injection mold operation.

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Injection Mold Design for Keyboard

The keys and key actuators of a low-cost keyboard are injection molded from a single injection mold operation.

Keybuttons 11-17 (Fig. 1) and their associated key stems 21-27 form a part of an entire keyboard which is an injection molded, single plastic part. Each of the keybuttons is sculptured to accommodate a finger, and several have differing shapes as is conventionally known. In order to mold this complex part, a two- cavity mold with interlocking slide combs is utilized.

Fig. 2 shows a cross-sectional view of the injection mold 31. Cavities in plate 33 are machined to match the complex keybutton 17 shapes and the cavities in plate 35 form the individual key levers 27, actuator bosses 37, and the interconnecting bulk head 39. The keybutton stems 41 and keybutton undercut 43 are formed by two interlocking slide combs 45 and 47. As the molding cycle is completed, the slide combs 45 and 47 move in the direction indicated by the arrows 49 and 51 and the keyboard part is then ejected from the mold.

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