US 2018/0323740 A1 · TRIGGER POTENTIOMETER

Abstract

An electric hand tool that includes an electric motor, an electrical position indicator for operation by a user, and a control unit for controlling power delivery from a power supply to an electric motor, based signals received from the electrical position indicator. The electrical position sensor may be coupled to a trigger operable by a user, and the electrical position sensor may be configured to detect the relative position of the trigger and to only operate in the middle of its possible range. The control unit may determine if the signals received from the electrical position indicator are out of a defined range. If the signals received from the electrical position indicator are out of a defined range, the control unit may register a fault, such as a fully open and/or fully short fault.

Claims13

Dependent claims

An electric hand tool, comprising:

an electrical motor;
an operating element comprising an actuation trigger and an electrical position indicator that reads a position of the actuation trigger;
and
a control unit for controlling power delivery to the electrical motor on the basis of the position of the actuation trigger, wherein:
the electrical position indicator is configured to sense the position of the actuation trigger in a working range that is within and less than its possible range, and provide a signal of the position of the actuation trigger to the control unit, and
the control unit is configured to detect signals from the electrical position indicator outside of the working range.

3 more elements

Dependencies are inferred from the claim text.

Trigger potentiometer

Life of this patent

Trigger potentiometer

Life of this patent

Abstract

Claims13