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:
Oct. 17, 1995
Filed:
Sep. 12, 1994
Toshiya Yuhi, Chiba, JP;
Mabuchi Motor Co., Ltd., Chiba, JP;
Abstract
A miniature motor including a case formed into a bottomed hollow tubular shape having a permanent magnet, an end cap fitted to an open end of the case, and a rotor having an armature iron core and a commutator. A sleeve made of a resin material and formed into a hollow cylindrical shape is fitted coaxially with the core constituting the armature iron core and the commutator, with a gap provided on at least one end face of the sleeve; a plurality of grooves facing at least an end face of the sleeve are provided on the iron core and the commutator at certain spacings in the circumferential direction; a projection for press-fitting to any one of the grooves is provided each on both end faces of the sleeve integrally with the sleeve; and a groove extending along the axial line of the sleeve is provided in the middle part of these projections.