Browse Prior Art Database

Torsion Spring Module

IP.com Disclosure Number: IPCOM000050864D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Olson, GD: AUTHOR

Abstract

The keyboard described in U.S. Patent 4,118,611 uses a compression spring which buckles to trip the pivot plate to the down position. The spring buckling and contacting the ramp contributes to the noise of the keyboard.

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Torsion Spring Module

The keyboard described in U.S. Patent 4,118,611 uses a compression spring which buckles to trip the pivot plate to the down position. The spring buckling and contacting the ramp contributes to the noise of the keyboard.

The use of a torsion spring 10 precludes the noise from that source because it uses its movement of center of force to trip the pivot plate 12.

The height of the module may be reduced because the torsion spring 10 can function in a more compact space.

The module showed less hysteresis with less than .005" between pivot plate up and down points as compared to about .070" on buckling spring module.

The torsion spring module displays reduced but discernable tactile feedback.

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