Safety device for machine tool operators, and the like

Details Safety device for machine tool operators, and the like Safety device for machine tool operators, and the like

1995-07-05

1996-10-08

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

307117, 340679, 34082531, G08B 13181, G08B 2100

Patent

active

055635814

ABSTRACT:
A safety device for machine tool operators has a generator for RF signals, an antenna connected with the generating means for receiving the generated signals, and positionable in the vicinity of a working zone of the machine tool to supply the signal to the working zone, an and element to be worn by an operator and providing a delayed version of the RF signal when the element is located in the vicinity of the antenna. An RF signal receiver is connected with the antenna and receives the delayed RF signal supplied by the element, a blocking unit is connected with the receiving means and blocks a machine tool drive when the RF signal delayed by the element worn by the user is received by the receiving means.

REFERENCES:
patent: 3564501 (1971-02-01), Flook, Jr.
patent: 4453161 (1984-06-01), Lemelson
patent: 5315289 (1994-05-01), Fuller et al.
patent: 5345138 (1994-09-01), Mukaidono et al.
patent: 5436613 (1995-07-01), Ghosh et al.

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