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:
Nov. 16, 1976
Filed:
Dec. 06, 1973
Applicant:
Inventor:
Morris D Robinson, Gardena, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
92-9 ; 137517 ; 188280 ; 188282 ; 188316 ; 188317 ;
Abstract
To prevent rapid collapse of a hydraulic lift mechanism in event of the failure of the hydraulic mechanism (e.g. as by rupture of a pressurized hydraulic line) a rate of flow responsive check valve is provided, either in a separate backup cylinder or at the inlet-outlet port of the lift cylinder, to close off the return flow path of the hydraulic line in the event of sudden depressurization of the hydraulic feed line or other pressure failure in the hydraulic liquid. In normal operation, the check valve does not oppose the return flow since the rate of such flow is insufficient to activate the valve.