Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-02-09
1989-08-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, 340556, G01V 904
Patent
active
048535311
ABSTRACT:
The apparatus is utilized to detect disturbance created in an opening by objects even when the objects do not move so that they cannot be detected by a motion detector. The apparatus includes a transmitter-receiver apparatus provided at the opening comprising a plurality of arrays, each of which comprises a receiver and a plurality of transmitters. Because divergent beams are emitted by the transmitters, which preferably consist of infrared-emitting diodes, the transmitters and the associated receiver can be arranged to define a triangle in space so that the space of the opening can be completely covered by a plurality of transmitter-receiver arrays. By means of a cyclic signal sequence it is ensured that a signal which has been transmitted is checked in the receiver whether it belongs to the correct transmitter. In order to ensure that high-speed folding shutter doors which are being closed or opened will be controlled so that they move into undisturbed areas, the space in which the movement of the high-speed doors is effected must be protected so timely that an impact on an object protruding into the region of the opening will be prevented in time. For this reason an evaluation signal generated by a control circuit is utilized to operate the door drive in time.
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Allen Stephone B.
Efaflex Transport und Lagertechnik GmbH
Nelms David C.
Vigil Thomas R.
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