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. 29, 2000
Filed:
Dec. 08, 1997
Chikafumi Sugai, Kiryu, JP;
Susumu Aoki, Kiryu, JP;
Mitsuba Corporation, Gunma, JP;
Abstract
In a brush holder device, in which an action-side end portion 22a of a torsion spring 22 is engaged with a torsion spring engaging groove 25 recessedly provided in an end surface of the brush 24 on the side opposite to a commutator 23, so that the elastic force of the torsion spring presses the brush against the commutator 23, a first inclined surface 26 is formed in the end surface of the brush 24 so as to incline at an angle of 15.degree. relative to a plane perpendicular to the axis of the brush, and second inclined surface 27 is formed in the engaging groove 25, being superposed on the first inclined surface 26. Further, a pigtail 28 is connected to the brush at an offset point relative to the engaging groove 25. Because of the second inclined surface, the torsion spring can suppress so-called 'wild behavior' of the brush, and thereby, can prevent brush sound. The angle of inclination of the first inclined surface can be set at a small value, the brush can be molded using a molding die.