Probe-actuated guard shield switch

Details Probe-actuated guard shield switch Probe-actuated guard shield switch

1981-07-13

1983-06-21

Shepperd, John W.

Electricity: circuit makers and breakers

Combined with or actuated by connector coupling

Multiple circuit control, selective

200 50B, 200 5109, 200153LA, H01H 922

Patent

active

043895514

ABSTRACT:
A probe-actuated guard-shield switch mechanism automatically disconnects a guard shield to an input terminal of a measurement instrument upon insertion of a guard probe, and reconnects the guard shield upon removal of the guard probe. The mechanism provides a break-before-make connection sequence for safety reasons, and also provides a non-conductive safety gate to minimize shock hazard.

REFERENCES:
patent: 2540496 (1951-02-01), Sperrazza
patent: 3222631 (1965-12-01), Cohen
patent: 3801757 (1974-04-01), Carissimi et al.
patent: 4145590 (1979-03-01), Repplinger
patent: 4271337 (1981-06-01), Barkas

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