Method and apparatus for securing a hazardous zone...

Details Method and apparatus for securing a hazardous zone... Method and apparatus for securing a hazardous zone...

2005-07-19

2005-07-19

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C072S021100, C072S021300

Reexamination Certificate

active

06919554

ABSTRACT:
A method and a sensor for the securing of a hazardous zone of a moving tool having a point of attack is disclosed. A monitored zone with a boundary surface is monitored whose cross-section extends along an arc of a circle or beyond it, wherein the center of the arc of a circle is arranged spaced apart from the point of attack of the tool in the direction of movement of the tool, and wherein the arc of a circle has a radius which is at least so large that the boundary surface of the monitored region extends—at least on the operator side—up to the point of attack of the tool or radially beyond the boundary surface.

REFERENCES:
patent: 4166369 (1979-09-01), Nakajima
patent: 5579884 (1996-12-01), Appleyard et al.
patent: 2750234 (1979-01-01), None
patent: 19516121 (1996-11-01), None
patent: 69310977 (1997-12-01), None
patent: 19717299 (1998-02-01), None
patent: 0995942 (2000-04-01), None
patent: 2120742 (1983-12-01), None
patent: WO 00/67932 (2000-11-01), None

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