Protective device operating without contact, in particular light

Details Protective device operating without contact, in particular light Protective device operating without contact, in particular light

1997-03-21

1999-12-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Housings

250216, 340555, H01J 502

Patent

active

059987855

ABSTRACT:
A protective device operating in contact-free manner, such as in particular a light barrier grid (10), including a transmitter unit and/or a receiver unit (12) for generating and/or for receiving sensing signals, such as in particular light signals which serve for the contact-free monitoring of a protective area. At least the transmitter unit and/or the receiver unit (12) of the protective device is accommodated in a pressure-tight, preferably tubular housing (14), which is at least partly permeable for the sensing signals and which in particular includes cable lead-throughs (16) which ensure explosion protection.

REFERENCES:
patent: 4021665 (1977-05-01), Hass et al.
patent: 5015840 (1991-05-01), Blau
patent: 5115129 (1992-05-01), Johnson
patent: 5490323 (1996-02-01), Thacker et al.
Homburg, D., et al., "Lichtschrankenbau: Leistungsfahige Elektronik plus robuste Mechanik", in: F & M 101 (1993) pp. 123-125.

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