Browse Prior Art Database

Unitary Plastic Keylever System

IP.com Disclosure Number: IPCOM000091739D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Anglin, NL: AUTHOR [+4]

Abstract

A one-piece polypropylene keylever system for a typewriter uses the integral hinge properties of polypropylene to permit flexion of the keylevers when they are depressed. The keylever system is injection molded in one piece using the rear-bearing support 1 as the mold runner with the keylevers 2 running off of it. Keylevers 2 are molded with necked-down portions 3 adjacent to support 1, which portions serve as hinges to permit flexion of keylevers 2 in a vertical direction during a typing operation. The integral hinge properties of the polypropylene causes keylevers 2 to become stronger in portions 3 after flexing. This is a result of the orientation of the polymer molecules caused by continued flexing. This strengthening permits keylevers 2 to be flexed without failure even after prolonged use.

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Unitary Plastic Keylever System

A one-piece polypropylene keylever system for a typewriter uses the integral hinge properties of polypropylene to permit flexion of the keylevers when they are depressed. The keylever system is injection molded in one piece using the rear- bearing support 1 as the mold runner with the keylevers 2 running off of it. Keylevers 2 are molded with necked-down portions 3 adjacent to support 1, which portions serve as hinges to permit flexion of keylevers 2 in a vertical direction during a typing operation. The integral hinge properties of the polypropylene causes keylevers 2 to become stronger in portions 3 after flexing. This is a result of the orientation of the polymer molecules caused by continued flexing. This strengthening permits keylevers 2 to be flexed without failure even after prolonged use.

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