Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-12-28
1991-06-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
180274, G01V 904
Patent
active
050234447
ABSTRACT:
A proximity sensor is provided for a machine which has a perimeter guard around the periphery of the frame of the machine. The machine has at least a moving part moved by the drive and with a control circuit to control the drive. The perimeter guard includes a radiation transmitter to project a radiation beam at least part of which extends outside the periphery. The perimeter guard further has movable mirrors and a movable bumper which, when moved, inhibit a radiation receiver from receiving the radiation beam. In this case, an output indication is generated to control the drive and stop the machine part. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
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Aktiebolaget Electrolux
Nelms David C.
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