Apparatus for controlling or regulating equipment powered by batteries
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United States of America Patent
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-
Apr 6, 1993
Grant Date -
N/A
app pub date -
Nov 22, 1991
filing date -
Dec 5, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus to control the operation of equipment powered by batteries, particularly for supplying the current to electrical equipment, such as cordless screwdrivers and cordless drills. The apparatus includes a housing, an external, displaceable trigger handle on the housing and an electric circuit with at least one power semiconductor. The function of the electric circuit being controlled preferably is a result of potentiometer adjustment through displacement of the trigger handle. The power semiconductor, which control the flow of current to the equipment motor, is disposed within the housing on a circuit board, which in turn makes contact with a heat sink, which protrudes through an opening in the housing freely to the outside.
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