G - Physics – 08 – B
Patent
G - Physics
08
B
340/136, 340/124
G08B 21/00 (2006.01) B66C 15/04 (2006.01) B66C 15/06 (2006.01)
Patent
CA 1182881
ABSTRACT OF THE DISCLOSURE A system for warning that a portion of a crane or other construction equipment has reached one of the boundaries of a working space. The system includes a laser transmitter that emits a beam which scans about a scanning axis to effect a curtain of light which defines a boundary of working space. Photosensors mounted on the outboard portion of the 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 equip- ment 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, an 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.
409022
Mckeon John F.
Tan Randy J.
Tullis Barclay J.
Fetherstonhaugh & Co.
Fmc Corporation
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