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. 01, 1995
Filed:
Apr. 08, 1994
Manfred Dripke, Rottenacker, DE;
Gerhard Saum, Ulm, DE;
Zwick GmbH & Co., Ulm, DE;
Abstract
A test frame has an upper end traverse, a lower end traverse below the upper end traverse, a pair of parallel upright tie rods having upper ends fixed in the upper traverse and lower ends fixed in the lower traverse, and a middle traverse between the upper and lower end traverses. Respective cylinders fixed on the middle traverse surrounding the tie rods are vertically slidable on the tie rods and each define with the respective tie rod a substantially closed chamber. A piston provided on each tie rod inside the respective cylinder subdivides the respective chamber into an upper compartment and a lower compartment. A source of fluid having a high-pressure side and a low-pressure side is connectable by a pair of respective valves to either of the respective compartments. A mechanical controller connected to both valves synchronously operates same to synchronize the position and movements of both cylinders.