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. 27, 1992
Filed:
Dec. 06, 1990
Applicant:
Inventor:
Robert T Quigg, Hatfield, PA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61G / ;
U.S. Cl.
CPC ...
280-522 ; 280D / ; 180-932 ; 180907 ;
Abstract
A stair-climbing attachment for a conventional foldable wheelchair including clutch mechanisms connecting the main wheels of the wheelchair to a drive mechanism for manually driving stair-climbing treads, ratchet and pawl mechanisms to selectively prevent or permit descending movement of the wheelchair on stairs, and manually actuated levers to manually position the treads in an operable and inoperable condition, the attachment permitting the wheelchair to be folded and conveniently transported by the user without outside assistance. A second embodiment incorporates a reversible motor to drive the treads. A third embodiment uses a hydraulic mechanism to position the treads.