Mold structure for manufacturing brush holder as part of an integrated molding process for an electric motor gear frame housing
US5266022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | May 19, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R43/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brush holder structure in an electric motor in which brush holders for housing brushes held in slidable contact with a commutator provided on a rotor shaft and an end bracket for rotatably supporting the rotor shaft are both integrally molded with a gear frame for housing and supporting a worm gear mechanism. In addition to the main mold for molding the gear frame, two first molds and two U-shaped second molds are abutted so as to form the brush holders when the gear frame is molded. A projection extending from each of the first molds extends between the arms of the associated U-shaped second molds to form a lead-out groove for leading out a pig tail extended from each brush. The lead-out groove is formed in a proximal end side wall of each brush holder with respect to the rotor shaft, and a receiving recess for receiving a resilient element fitted in each brush holder to press each brush against a commutator is disposed between the proximal and distal end side walls of each brush holder as a result of the separation between the projection on the first mold and the base of the associated U-shaped second mold. The receiving recess extends in the axial direction of the rotor shaft,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.