Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1988-03-25
1989-09-05
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
60459, 91361, 74471XY, 267150, 1376362, 244227, 180333, B66C 300
Patent
active
048633372
ABSTRACT:
A control system for a working machine which has a boom equipped with a working implement at its forward end and pivoted to a vehicle body movably about a vertical axis, and control valve for controlling the movement of the boom. The system comprises a variable resistor for setting a target position where the boom is to be stopped to produce a setting signal, a sensor for detecting the moved position of the boom to produce a detection signal, differential device for determining the difference between the setting signal and the detection signal to produce a difference signal, a detector for detecting the direction of movement of the boom from the magnitude of the difference signal, a pulse-width modulator for subjecting the difference signal to pulse-width modulation to produce a pulse signal, and a driver for driving the control valve by the pulse signal in the detected direction in proportion to the difference signal.
REFERENCES:
patent: 2329742 (1943-09-01), Bush et al.
patent: 3038451 (1962-06-01), Sporn et al.
patent: 3904051 (1975-09-01), Tsuchiya et al.
patent: 4477043 (1984-10-01), Repperger
patent: 4721274 (1985-08-01), Erb
Aoki Tuyoshi
Ishiguro Toshio
Mizota Hideaki
Kubota Ltd.
Spar Robert J.
Underwood Donald W.
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