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:
Jun. 25, 1991
Filed:
Jan. 10, 1990
Richard J DeCloux, Manchester, NH (US);
Other;
Abstract
An auxiliary cylinder is provided as an adjustable volume accumulator in communication with the two hydraulic ram cylinders utilized to phase the steps utilized in stair climbing apparatus. Step height adjustment is facilitated by providing the auxiliary cylinder with a ram and a positioning lever, with step height adjustment being accomplished through the removal of oil from the system by backing off the ram. Moving the ram forward replaces oil lost during carry out. The subject system facilitates rapid step height adjustment, facilitates lowering of the steps for permitting under-bed storage through the dropping of the steps, and makes up fluid loss during carry out for preventing step height loss. Additionally, operating cylinder component sizing is used to minimize step height growth due to thermal expansion of the fluid in the system.