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. 24, 1989
Filed:
Dec. 17, 1987
Applicant:
Inventor:
Walter Kolb, Betzdorf/Sieg, DE;
Assignee:
Wolf-Gerate GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318 17 ; 318254 ;
Abstract
The invention relates to an electric-motor drive system for hand-guided tools, in particular for garden appliances but also for tools used at home such as drills and the like. A power source 12 which is portable or adapted to be fixed to the tool has a chargeable direct-current battery 14, the output of which is connected to a converter 16 which contains an electronic circuit which converts the DC voltage to a three-phase voltage. Via a three-phase line 22 a three-phase motor 18 is supplied and drives the tool 20 directly or via a coupling 28.