Machine guard installations

Details Machine guard installations Machine guard installations

1976-09-30

1978-12-19

Moose, Jr., Harry E.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307326, 331 65, 361179, 361203, H01H 3500

Patent

active

041307631

ABSTRACT:
A machine guard installation makes use of a proximity detector system including a passive time circuit on the guard. The timed circuit includes a coil which is magnetically coupled to a further coil only when the guard is in its operative guarding position. The further coil forms a part of a positive feedback loop of an amplifier in an active detector circuit, which oscillates only when the coils are coupled as aforesaid.

REFERENCES:
patent: 2828480 (1958-03-01), Golladay
patent: 3197658 (1965-07-01), Byrnes et al.

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