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:
May. 28, 1991
Filed:
May. 14, 1990
Masashi Fukui, Tochigi, JP;
Tomoyuki Shinoda, Gunma, JP;
Mitsuba Electric Manufacturing Co., Ltd., Gunma, JP;
Abstract
A brush holder device for an electric motor has a brush holder, a brush movably received in the brush holder, and a spring which acts between the bottom of the brush holder and the outer end of the brush so as to resiliently press the brush into contact with a commutator. The surface of the bottom of the brush holder on which one end of the spring acts and the outer end surface of the brush on which the other end of the spring acts are inclined in opposite directions along the axis of the motor such that the distance between the surfaces is greater at one axial end than at the other axial end of the brush holder. As a result, the spring is naturally urged to and stably held in the axial end where the distance between these two surfaces is greater. In addition, or alternatively, the bottom surface of the brush holder includes a recessed portion for containing the spring at one axial end of the brush holder.