Patent · US Expired

Universal electric motor for hand-held tool devices

US6586855B2 · kind B2 · utility

13Cited by

7References

9Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Helmut Burger · Waiblingen, DE
Hermann Schuster · Geltendorf, DE

Key dates

Filing date	Aug 23, 2001
Grant date	Jul 1, 2003
Priority date	—
Expiry date	Aug 23, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH02K5/148
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A universal electric motor (1) for driving an electric hand-held tool device which experiences a high dust load, has a commutator (2), with carbon brushes (9) and lamellas (4). The motor has, for protection against dust particles carried along in the cooling air flowing through it, a protective shield (3) of a stiff and thermally conductive material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.