Piano lift

Details Piano lift Piano lift

1982-07-26

1984-10-09

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Multiple lifters

B66F 712

Patent

active

044757140

ABSTRACT:
A grand piano lift comprising a dolly on which the piano is placed and having a hydraulic cylinder fixed in vertical disposition to the dolly in the vicinity of each of the three legs of the piano. A piston is slidably disposed in each of the cylinders and has a piston rod extending from the piston fixed to a pedestal that contacts the floor or platform from which the piano is to be supported. An operator operated UP switch is electrically connected with a source of hydraulic fluid under pressure so that the operator can cause fluid to be applied to the cylinders from the source and so that the cylinders are effective to raise the dolly and piano. A similar DOWN switch causes this fluid to be drained from the cylinders to cause the piano to be lowered. A ball check valve prevents the undesired descent of the piano when neither switch is actuated, and a flow divider causes equal volumes of fluid to be applied to the three cylinders for the equal upward travel of the three legs of the piano when the piano is being raised.

REFERENCES:
patent: 2904308 (1959-09-01), Vergara
patent: 3112836 (1963-12-01), Back
patent: 3750516 (1973-08-01), Olson
patent: 4112823 (1978-09-01), Liberman et al.
patent: 4168099 (1979-09-01), Jacobs et al.

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