The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 1984
Filed:
Jul. 26, 1982
Ronald E Heiskell, Union City, CA (US);
Gregg R Kirkpatrick, Rodeo, CA (US);
Garry F Newman, Tracy, CA (US);
James D Stewart, Oakland, CA (US);
Other;
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.