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:
Jul. 17, 1979
Filed:
Nov. 11, 1977
Applicant:
Inventor:
Karl Krieger, Wuppertal, DE;
Assignee:
Maschinenfabrik GmbH & Co., Wuppertal, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
91461 ; 91420 ; 91447 ; 91465 ; 137244 ; 137557 ; 13759614 ;
Abstract
A control unit for controlling the supply of fluid to a hydraulic jack, the control device including a main valve having a valve member normally held closed by pressure in a pressure chamber, the pressure chamber being fed with fluid through a bore in a valve member of the main valve. In one embodiment, a valve spindle slides in the bore to stop it being blocked. In another embodiment, designed to control a double-acting jack, the main valve is associated with a second similar main valve the pressure chamber of which is fed from the first main valve instead of through a bore in its valve member.