Safe load indicator

Details Safe load indicator Safe load indicator

1982-09-24

1985-04-09

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

7386245, 177147, 340685, G01L 504

Patent

active

045093768

ABSTRACT:
A dynamometer, used to measure the tension on, speed of, and direction of movement of a hoist rope on a crane, includes a frame comprising three spaced apart blocks coupled to one another by pairs of thin flexible resilient portions. Two pulleys are mounted to the outermost blocks while an offset pulley, coupled to a tension monitoring load cell, is mounted to the central block and presses against the rope. One pulley has three permanent magnets imbedded about its periphery, two being axially spaced across from one another and the third being spaced radially 180.degree. from the others. Sensors mounted to the frame are positioned to sense the passing of the magnets to provide rope speed and direction of travel information in digital form. Tension information from the load cell and speed and direction information from the sensors are supplied to a microprocessor for processing.

REFERENCES:
patent: 3244243 (1966-04-01), Fielder
patent: 3310981 (1967-03-01), Nixon et al.
patent: 4052602 (1977-10-01), Horn et al.
patent: 4142152 (1979-02-01), Fincher
patent: 4212006 (1980-07-01), Cakebread et al.

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