Method of and apparatus for monitoring or controlling the operat

Details Method of and apparatus for monitoring or controlling the operat Method of and apparatus for monitoring or controlling the operat

1977-12-28

1980-01-22

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

212 39A, 364424, 364508, B66C 1506, G08B 2100

Patent

active

041852800

ABSTRACT:
The operation of a boom-type crane or the like is monitored or controlled and, especially, a setpoint signal is generated which represents the total load moment for any given set of crane-operating parameters so that this setpoint signal can be compared with an actual-value signal and the crane operator alerted or crane operation terminated when the actual value of the boom-load moment approaches the maximum permissible value thereof. According to the invention, three storage units are provided, the first storing a value of the crane-boom intrinsic moment as a function of the crane parameters, the second storing a unit-load moment value as a function of the crane parameters and the third storing values of the maximum permissible load moment per unit load. A controller is provided to carry out arithmetic operations on signals from the three storage units and, more particularly, for multiplying the output signals of the second and third storage units and adding to the resulting product a signal representing the value from the first storage unit as a function of the crane-operating parameters. The crane-operation parameters are generally the horizontal and vertical angles of the crane boom and the length thereof.

REFERENCES:
patent: 3586841 (1971-06-01), Griffin
patent: 3638211 (1972-01-01), Sanchez
patent: 3740534 (1973-06-01), Kezer et al.
patent: 4006347 (1977-02-01), Hohmann
patent: 4052602 (1977-10-01), Horn et al.
patent: 4078668 (1978-03-01), Hohmann

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