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:
May. 12, 2009
Filed:
May. 20, 2005
Ronald W. Goodrich, Logansport, IN (US);
Ronald W. Goodrich, Logansport, IN (US);
The Braun Corporation, Winamac, IN (US);
Abstract
A hydraulic drive system for an access apparatus and a method of access is presented. The hydraulic drive system may include a hydraulic power unit, a hydraulic cylinder and a subsystem for limiting motion of the access system according to the position of and/or load supported by the access system. The subsystem may prevent motion, such as stowing and/or folding, when the access apparatus is supporting a load and/or is in a predetermined position. To limit motion, the subsystem may create a fluid path from the hydraulic power unit that bypasses the hydraulic cylinder, thus preventing the cylinder from moving the access apparatus. The subsystem may include a first valve that is opened when the access apparatus is in the predetermined position, and/or a second valve that is opened when the access apparatus is supporting a load.