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:
Feb. 19, 1991
Filed:
Dec. 22, 1989
Edward G King, Baltimore, MD (US);
Hilmer H Shackelord, Jr, Finksburg, MD (US);
Leo M Kahl, Baltimore, MD (US);
Chamberlain MRC, division of Duchossois Industries, Inc., Elmhurst, IL (US);
Abstract
A stair climbing robot and method of operation is described. The robot includes a chassis having powered opposed front wheels and two pairs of rear wheels each pair being rotatably mounted on a beam at opposite ends thereof, and each beam being rotatably mounted on the chassis. A drive motor is provided for driving each pair of wheels in the same direction at a predetermined rotational velocity and a drive means is provided for simultaneously rotating the beams at a predetermined rotational velocity and in a predetermined direction. The method of operation to climb stairs includes the steps of activating the rotation of the beams in a forward direction while causing each pair of rear wheels to rotate in an opposite direction at the same rotational velocity. In this way, forward movement is achieved by action of the front wheels and the rotating beams and the rotational velocity of the rear wheels relative to the terrain will be zero.