Pressure-sensitive wrist pad useable with a computer input devic

Details Pressure-sensitive wrist pad useable with a computer input devic Pressure-sensitive wrist pad useable with a computer input devic

1997-03-27

1999-04-06

Ramirez, Ramon O.

Supports

With condition responsive control means

248118, F61M 1300

Patent

active

058906940

ABSTRACT:
A pressure-sensitive wrist pad placeable in front of a keyboard or other input device associated with a computer, the pad serving to warn an operator when in the course of operating the keyboard, the wrists of his hands do not then hover above the pad but rest on the pad and therefore give rise to dorsiflexion and possible repetitive strain injury. To this end, the pad incorporates in its structure a switch which is caused to close only when wrist pressure is exerted thereon, the closed switch acting to apply power to a warning device generating an audible, visible or vibratory warning signal. This signal acts to induce the operator to assume a proper wrist position hovering above the pad thereby avoiding dorsiflexion. The pressure-sensitive switch is preferably formed by a membrane covering the pad, the membrane being composed of a flexible foam plastic core layer having an array of openings therein sandwiched between plastic facing films on each of whose inner surfaces is printed an electrically-conductive grid. The grids constitute the movable contacts of the switch which is closed when wrist pressure applied to the membrane compresses the foam plastic layer to bring the grids in contact with each other through the openings in the layer.

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