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. 12, 2010
Filed:
Dec. 13, 2007
Applicant:
Wolfgang Voss, Schwerte, DE;
Inventor:
Wolfgang Voss, Schwerte, DE;
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21D 23/26 (2006.01); B60T 13/58 (2006.01);
U.S. Cl.
CPC ...
Abstract
In order to increase the pressure of the hydraulic medium in cylinders, especially those of the hydraulic longwall construction used in underground mining and tunnel construction, a control unitis used which has suitably controllable, releasable check valvesand, as well as a blockable check valve. These check valves and the associated directional valves create the possibility of filling both the cylinder spaceproper and the piston rod cavity, which enables the pressure adjustment process with hydraulic medium in a specific manner, or accordingly their discharge, with no risk of reciprocal influence, seizing, or other damage.