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:
Jul. 05, 2011
Filed:
Feb. 03, 2009
Robin Warner, Torrington, CT (US);
Siu Chun Tam, Hong Kong, CN;
Robin Warner, Torrington, CT (US);
Siu Chun Tam, Hong Kong, CN;
Johnson Electric S.A., La Chaux-de-Fonds, CH;
Abstract
An electric motorhas a stator; a wound rotor, including a commutator; and brush gear for connecting the commutator to a source of electrical power. The brush gear has at least two cage brush assemblies. Each cage brush assemblyhaving a brushfor making sliding electrical contact with the commutator of the motor; a cagefor guiding the brushalong a path towards the commutator; and a springfor resiliently urging the brushalong the path through the cage. The springis a constant force spring having two coiled end portions which engage the cageat a commutator end portion. The cagehas two fingers about which the coiled end portions of the springlocate.