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. 16, 1992
Filed:
Mar. 05, 1991
Applicant:
Inventor:
Richard N Johnson, Marstons Mills, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60L / ; B60K / ; B60G / ; B62K / ;
U.S. Cl.
CPC ...
180 655 ; 180 685 ; 180907 ; 2801122 ; 280755 ; 280788 ; 297D / ;
Abstract
An improved power wheelchair is provided that provides exceptional maneuverability, stability and directional tracking characteristics. The wheelchair includes a torsional frame and a rigid stability frame. Two main wheels and a pivoting drive wheel are coupled to the torsional frame. At least two freely rotating casters are coupled to the stability frame. The torsional frame and stability frame interact to provide automatic compensation for directional tracking errors caused by shifts in the mass center of an occupant. The wheelchair can be equipped with either manual or power steering. A unique three-point battery mounting assembly also permits easy replacement of batteries.