Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1980-10-24
1983-06-28
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177 1, 177DIG3, G01G 314
Patent
active
043900755
ABSTRACT:
A loader includes a lift arm assembly, raised by hydraulic lift cylinders and carrying a load bucket. Alignment members mounted respectively on the loader frame and lift arm assembly, and visible to the loader operator, identify the weigh position of the lift arm assembly. A pressure to voltage transducer is mounted on one lift cylinder, and is connected in a bridge circuit producing a DC voltage output. The bridge circuit output signal, proportional to the bucket load, is fed to an amplifier, whose output is passed to an analog-to-frequency converter producing pulses at a frequency proportional to the bucket load. An electronic clock allows the converter output pulses to pass through an AND gate to a bucket counter which displays the bucket load, and is automatically reset to zero. The converter pulses are passed to an accumulator counter through a second AND gate. The accumulator counter accumulates the weight of several bucket loads which are loaded onto a transport vehicle; and is reset manually after the vehicle is loaded.
The method includes the steps: detecting the instantaneous pressure in the hydraulic lift cylinder; converting that instantaneous pressure into an electric analog signal proportional to the instantaneous pressure; adjusting that analog signal to eliminate the component which represents the weight of the empty bucket; amplifying the adjusted analog signal; converting the adjusted analog signal to a frequency signal comprising pulses generated at a frequency proportional to the adjusted analog signal; and passing the frequency signal to a pulse counter, through controlled gate means for counting and displaying pulses representing the instantaneous bucket load. The same pulses are passed to a second counter through the same control gate and through an additional control gate to accumulate pulses representative of successive bucket loads.
REFERENCES:
patent: 3662845 (1972-05-01), Pratt
patent: 3984667 (1976-10-01), Loshbough
patent: 4044846 (1977-08-01), Matilainen
patent: 4139069 (1979-02-01), Domis et al.
Miller Jr. George H.
Murphy Peter J.
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