Safety shield control device

Details Safety shield control device Safety shield control device

1983-04-21

1986-04-01

Moose, Jr., Harry E.

Electrical transmission or interconnection systems

Switching systems

Plural switches

307116, 307328, 340547, 340644, 324 98, 324219, 361180, 361193, H01H 1964, G08B 1308, G01R 1702

Patent

active

045800626

ABSTRACT:
An electrical interlock to prevent unauthorized access to potentially hazardous equipment and an associated detection circuit to detect if a safety shield or closure member is open, not securely closed or has been tampered with and to thereupon automatically de-energize the equipment. The detection circuit may comprise a balanced bridge incorporating the electrical interlock into a leg thereof and may also provide a visual or audible indication whenever the bridge is unbalanced thereby indicating an improperly closed safety shield.

REFERENCES:
patent: 3813663 (1974-05-01), Perkins
patent: 3825920 (1974-07-01), Nelson et al.
patent: 3864173 (1975-02-01), Butschkan
patent: 4335376 (1982-06-01), Marquardt
patent: 4349814 (1982-09-01), Akehurst
patent: 4420745 (1983-12-01), Dray et al.

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