Safe load indicator
First Claim
1. A crane with a crane jib having a data processing system comprising,a microprocessor,means for measuring an angle of elevation of said crane jib at the base of said jib,transmitting means transmitting said base angle to said microprocessor,means for measuring an angle of elevation of said crane jib at the head of said jib,transmitting means transmitting said head angle to said microprocessor,means for measuring the length of said jib from jib base to jib head,transmitting means transmitting said length to said microprocessor,said microprocessor being enabled to receive and process data corresponding to said angles and length so as to determine mathematically a true deflected form of said crane jib,whereby actual jib radius can be calculated.
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Accused Products
Abstract
A crane having a novel data processing system which uses a microprocessor (22), to calculate mathematically the actual jib radius (R1) from inputs corresponding to jib head angle elevation, jib base elevation and jib length from head (9) to base (8). The system provides actual data which can be fed to a display (10) and which can actuate alarms (24), (26) on reading a safe load stored in a load table in a microcomputer of which the microprocessor forms a part. The actual data can also control motion cut offs, automatic luffing and automatic stowage. A novel dynamometer (30) is also included which can measure crane hoist loads, speed and direction.
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Citations
21 Claims
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1. A crane with a crane jib having a data processing system comprising,
a microprocessor, means for measuring an angle of elevation of said crane jib at the base of said jib, transmitting means transmitting said base angle to said microprocessor, means for measuring an angle of elevation of said crane jib at the head of said jib, transmitting means transmitting said head angle to said microprocessor, means for measuring the length of said jib from jib base to jib head, transmitting means transmitting said length to said microprocessor, said microprocessor being enabled to receive and process data corresponding to said angles and length so as to determine mathematically a true deflected form of said crane jib, whereby actual jib radius can be calculated.
Specification