Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-08-17
1983-10-04
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
180168, 212153, 340557, G08B 2100
Patent
active
044081952
ABSTRACT:
A laser transmitter emits a beam which scans about a scanning axis to effect a curtain of light which defines a boundary of a working space. Photosensors mounted on the outboard portion of a crane or other construction equipment generate warning signals to the construction equipment operator and other nearby personnel whenever these photosensors move into the light curtain. Additional curtain sensing equipment positioned to intercept the rotating laser beam with each cycle of rotation develops an alarm signal which activates an alarm horn and/or alarm light whenever the laser transmitter fails to provide the light curtain. The additional curtain sensing equipment is mounted an appropriate distance from the laser transmitter so that such additional sensing equipment will not interfere with the reception of the light curtain by the photosensors on the crane, and the laser transmitter and the additional curtain sensing equipment are mounted several feet above the ground to prevent foot traffic and vehicle traffic from producing false indications of a laser transmitter failure by intercepting the light curtain.
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McKeon John F.
Tan Randy J.
Tullis Barclay J.
FMC Corporation
Guernsey Lloyd B.
Megley Richard B.
Stanley Henry M.
Swann III Glen R.
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