Traversing hoists – Having random condition sensor combined with an indicator or... – Senses crane tilt
Reexamination Certificate
2008-04-29
2008-04-29
Brahan, Thomas J. (Department: 3654)
Traversing hoists
Having random condition sensor combined with an indicator or...
Senses crane tilt
C212S304000, C212S305000, C280S765100
Reexamination Certificate
active
10552787
ABSTRACT:
The present invention provides a safety device against crane overturning which operates in a crawler crane comprising at least four outriggers in a frame, the safety device comprising a load detector2that detects a ground reaction to each of the outriggers, and an alarm output section4which calculates sums of detected values for ground reactions to every two adjacent outriggers to find a minimum value of the sums. The alarm output section then compares the minimum value obtained with a preset preliminary reference value and a preset limit reference value and outputs a preliminary alarm signal when the minimum value is smaller than the preliminary reference value or outputs a limit alarm signal when the minimum value is smaller than the limit reference value. This prevents safety from being degraded as a result of a change in the working radius of the crane. Further, calculation processes are simplified.
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Brahan Thomas J.
Furukawa Co., Ltd.
Young & Basile
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