Switch. especially battery switch for hand-operated electric too

Details Switch. especially battery switch for hand-operated electric too Switch. especially battery switch for hand-operated electric too

1992-05-07

1994-02-22

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

219497, 361702, 361717, 361711, H02D 516

Patent

active

052890473

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.

REFERENCES:
patent: 4100383 (1978-07-01), Piber

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