Means for avoiding accidental actuation of a critical...

Details Means for avoiding accidental actuation of a critical... Means for avoiding accidental actuation of a critical...

H - Electricity

01

H

340/187, 306/305

H01H 13/14 (2006.01) B41J 5/26 (2006.01) H01H 13/50 (2006.01) H01H 13/70 (2006.01)

Patent

CA 1171445

MEANS FOR AVOIDING ACCIDENTAL ACTUATION OF A CRITICAL FUNCTION KEY Abstract of the Disclosure A keyboard having a plurality of keys thereon, with each key being moveable from a rest position along an actuation path having a makepoint therealong, whereby completion of an electrical circuit is effected by moving a key with a predetermined force along its actu- ation path to its associated said makepoint. Each of the keys has means for restoring it towards its rest position. At least one of the keys is designated as a special key and it has warning means associated therewith and positioned with respect to the special key and keyboard so as to increase the force (above the predeter- mined force) required to actuate the special key. The increase in force provides tactile feedback to an opera- tor of the keyboard before the special key's associated makepoint is reached to thereby warn said operator that he is about to actuate the special key. The warning means is made of resilient material, has a general, washer-like shape, and is positioned under the key cap of the special key.

390618

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