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:
Apr. 16, 2002
Filed:
Aug. 30, 1999
Applicant:
Inventors:
Gianluca Foschini, Cervia, IT;
Renzo Toschi, Bologna, IT;
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B 1/108 ; B66B 1/28 ; F04B 1/700 ;
U.S. Cl.
CPC ...
F15B 1/108 ; B66B 1/28 ; F04B 1/700 ;
Abstract
A vertically oriented hydraulic power unit for an elevator drive includes an outer tank for drive fluid and an inner tank for fluid used to submerge and cool a motor, the fluids being exchangeable to maintain temperature in the inner tank at or below a specified maximum temperature. Oil returning from an elevator piston is fed into said inner tank to keep the inner tank sufficiently cool.