Safety device for manually operable code generation

Details Safety device for manually operable code generation Safety device for manually operable code generation

1984-02-17

1986-08-05

Brigance, Gerald L.

Communications: electrical

Audible indication

Percussion-type sound producer

200333, 200 46, 340365A, G06F 302

Patent

active

046046054

ABSTRACT:
A base with a keyboard for the manual generation of data combinations, e.g. of a code serving to release a lock of a door on which the keyboard is accessibly mounted, has one or more wipers impregnated with a nonvolatile film of liquid such as silicone oil. The wipers are carried on a lid which is pivotally or slidably attached to the base; movement of the lid, or of a detent holding it in closure position, causes the wipers to sweep across coplanar pressure faces of the keyboard and remove any finger marks that could be used by a would-be trespasser to help breaking down the code. The pressure faces are areas of a flexible foil having a rough outer surface for retaining part of the film of liquid spread thereover; the foil may comprise a porous layer underlain by a spongy layer storing some of that liquid.

REFERENCES:
patent: 3950634 (1976-04-01), Speiser
patent: 3954085 (1976-05-01), Nassimbene
patent: 4283714 (1981-08-01), Trenkler et al.
patent: 4359619 (1982-11-01), Bergoltz
patent: 4431882 (1984-02-01), Frame
patent: 4439647 (1984-03-01), Calandrello et al.
patent: 4439757 (1984-03-01), Gross et al.
patent: 4443789 (1984-04-01), Endfield et al.
patent: 4501936 (1985-02-01), Morse
patent: 4508402 (1985-04-01), Tomino et al.
patent: 4509873 (1985-04-01), Ryan

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