Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-09-23
1990-02-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250239, 180275, G01N 2186
Patent
active
049030540
ABSTRACT:
An obstacle detection system for protecting a frame upper end portion and laser scanning device of a self guided vehicle from damage by external objects includes a device for delivering a light signal in a direction along a preselected elevationally oriented axis and a device for receiving a reflection of the delivered light signal and delivering a condition control signal in response to receiving the reflected light signal. A supporting assembly is connected to the frame upper end portion and a guide frame is connected to the supporting assembly and defines a plane passing through the elevationally oriented axis. A reflecting member is supported on the guide frame and a connecting device connects the reflecting member to the support assembly and maintains the reflecting member for movement between a first position at which the reflecting member reflects the light signal towards the receiving device and a second position spaced from the first position at which the reflecting member is free from reflecting the light signal towards the receiving device.
REFERENCES:
patent: 2522637 (1950-09-01), Pripeton
patent: 3664701 (1972-05-01), Kondur
patent: 4722410 (1988-02-01), Melocik et al.
patent: 4730690 (1988-03-01), McNutt et al.
Caterpillar Industrial Inc.
Hickman Alan J.
Nelms David C.
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