Signalling device

Details Signalling device Signalling device

1978-12-04

1980-09-23

Yusko, Donald J.

Communications: electrical

Systems

Portable self-contained

340171R, 340365S, 340696, H04B 1034, H01H 1304, H01H 918, G08B 2100

Patent

active

042246024

ABSTRACT:
A small, portable lightweight, water-resistant, manually-operated signalling device. The signalling device includes a signalling assembly fully enclosed within a pair of hermetically sealed housings. The signalling assembly includes a signalling circuit and a pressure sensitive switch adapted, when depressed, to actuate the signalling circuit. One of the housings includes a recessed, flat, semi-rigid deflective wall having an indentation formed therein and in physical contact with the pressure sensitive switch. The indentation is capable of being manually depressed and, when depressed, to transmit the pressure applied to the indentation to the switch, thereby operating the signalling circuit. The indentation and the switch are arranged with respect to each other so that depression of the switch and actuation of the signalling circuit can only occur in response to pressure being applied to the indentation.
The signalling device further includes a shock-absorbing rim formed at the perimeter of the housing having the indentation therein for minimizing the possibility of unintentional or accidental operation of the signalling device by virtue of the signalling device coming into physical contact with a surface or object, as by dropping the signalling device.

REFERENCES:
patent: 2810068 (1957-10-01), Weisz et al.
patent: 3676607 (1972-07-01), Nash et al.
patent: 3676615 (1972-07-01), Weidmer
patent: 3777222 (1973-12-01), Harris
patent: 4078257 (1978-03-01), Bagley
patent: 4101871 (1978-07-01), Oliveira
patent: 4121160 (1978-10-01), Cataldo

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