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:
Feb. 22, 1994
Filed:
May. 07, 1992
Peter Broghammer, Wurmlingen, DE;
Marquart GmbH, Rietheim-Weilheim, DE;
Abstract
A switch, especially for use in a hand-operated storage-battery electric tool with a DC motor is proposed, in which control electronics are provided for changing the speed of the DC motor. In order to produce the switch as compactly as possible and without additional connecting lines to the power transistor and in order furthermore to influence positively the heat budget inside the switch, a contact system (5) and a freewheeling diode (8) are pivoted to a common bearing plate (11) which is connected in current-carrying and heat-conducting fashion via a connecting bolt (12) to a power transistor (7) on the housing. In this arrangement, the power transistor is cooled by a heat sink provided on the switch housing.