Implements or apparatus for applying pushing or pulling force – Hoisting truck – Single throw lever
Patent
1992-05-13
1993-04-20
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Single throw lever
254124, 254DIG16, B60P 148
Patent
active
052035409
ABSTRACT:
A hydraulic lifting device is used to lift a chassis part, such as a gearbox, and includes a mobile base and an upright prop which extends upwardly from the mobile base and which has a top end that is provided with a stationary pivot seat. A connecting bar is used to support the chassis part thereon. A driving crank arm has one end which is hinged to a first hinge point on the pivot seat and the other end hinged to a first hinge point on the connecting bar. A driven crank arm has one end hinged to a second hinge point on the pivot seat and the other end hinged to a second hinge point on the connecting bar. The pivot seat, the driving crank arm, the driven crank arm and the connecting bar cooperatively form a parallel crank four-bar linkage. A hydraulic cylinder has one end pivoted to the upright prop and another end pivoted to the driving crank arm. The hydraulic cylinder is operated so as to pivot the driving crank arm toward or away from the upright prop in order to adjust the height of the connecting bar. The pivoting action of the driving crank arm causes the driven crank arm to pivot at a similar angular speed to prevent angular deviation of the connecting bar.
REFERENCES:
patent: 2814394 (1957-11-01), Witcher
patent: 3111232 (1963-11-01), Benson
patent: 4796861 (1989-01-01), Petty
patent: 4899985 (1990-02-01), Good
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