Patent
1977-09-15
1978-12-12
Paperner, L. J.
37DIG1, 214152, 214761, E02F 920
Patent
active
041292243
ABSTRACT:
In a backhoe of the type having an outreach boom horizontally pivotally mounted relative to a vehicle and an hydraulic cylinder therebetween, a downreach boom horizontally pivotally mounted on the free end of the outreach boom and an hydraulic cylinder therebetween, and a digging bucket horizontally pivotally mounted on the free end of the downreach boom and an hydraulic cylinder therebetween, apparatus is provided for respectively generating signals proportional to the angle between the outreach boom and the horizontal, the angle between the outreach boom and the downreach boom, the angle between the downreach boom and a line drawn to the digging teeth of the bucket, and an angle equal to the desired slope of the bottom of the excavation relative to the true horizontal. Such signals are combined according to a trigonometric equation to provide a continuous signal and/or visual indication to indicate the absolute elevation of the digging teeth of the backhoe bucket and the same signals are also utilized to control the hydraulic cylinders and the relationships between the aforementioned angles so that the digging teeth of the bucket move parallel to the desired slope of the bottom of the excavation throughout the digging stroke.
REFERENCES:
patent: 3586184 (1971-06-01), Pesquento et al.
patent: 3997071 (1976-12-01), Leach
patent: 4044610 (1977-08-01), Oldaeus et al.
Laserplane Corporation
Paperner L. J.
Schaich W. A.
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