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:
Apr. 22, 1997
Filed:
May. 24, 1995
Michael A Dimatteo, Kettering, OH (US);
Gary C Fulks, Spring Valley, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An electric motor comprising a rotatably mounted rotor, a commutator brush retainer mounted fixedly with respect to the rotor, wherein the commutator brush retainer rotates with the rotor, at least one brush slidably mounted to the commutator brush retainer, wherein the brush is slidable in a radial direction between a radially retracted position and a radially extended position, and a spring connected to the commutator brush retainer and to said one brush, wherein the spring biases the one brush to the radially retracted position and, wherein, during rotational movement of the motor, centrifugal force moves the one brush toward the radially extended position, wherein, as a rotational velocity of the rotor increases, the one brush moves closer to the radially extended position.