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. 26, 1988
Filed:
Nov. 03, 1986
Masaki Iizima, Kiryu, JP;
Toshio Takahashi, Kiryu, JP;
Mitsuba Electric Manufacturing Co., Ltd., Gunman, JP;
Abstract
An improved commutator usable for an electric motor of the type adapted to be press fitted onto the support shaft of a rotor which is accommodated in the motor. The inner wall of the commutator comprises a plurality of larger diameter portions of which inner diameter is larger than the outer diameter of the support shaft and a plurality of press fitting portions of which inner diameter is smaller than the outer diameter of the support shaft. Press fitting of the commutator onto the support shaft is achieved by elastic bending deformation of the press fitting portions on the inner wall of the commutator in the outward direction. Typically, the inner wall of the commutator comprises three larger diameter portions and three press fitting portions. No preliminary machining is required on the inner wall of the commutator before press fitting is effected. The amount of press fitting allowance can be increased remarkably compared with any conventional commutator.