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:
Aug. 18, 1987
Filed:
Jun. 23, 1986
Applicant:
Inventor:
Chester K Wilson, Manchester, MO (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187 17 ; 91443 ;
Abstract
In a hydraulic elevator system including a hydraulic cylinder, ram mounted in the cylinder and supporting an elevator car, a reservoir of hydraulic fluid and a return line connected to communicate with hydraulic fluid in the cylinder and the reservoir to permit the fluid to exhaust from the cylinder to the reservoir, a control valve assembly has an exhaust orifice communicating with the fluid in the hydraulic cylinder and with the reservoir, an exhaust piston for selectively closing and opening the orifice and a device responsive to pressure of the hydraulic fluid for limiting the amount by which the exhaust piston opens the orifice.