Trigger profile for a power tool
AssigneeBlack & Decker Inc.
InventorsScott Eshleman, Joseph P. Kelleher
Life of this patent
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Abstract
An improved method is provided for operating a power tool. The method includes receiving an input control variable from an input unit; determining a second derivative of the input control variable; selecting one of a plurality of control profiles based on the control input variable and the second derivative, each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft; and driving the output shaft at a rotational speed in accordance with the selected control profile.
Claims14
A method for operating a power tool having an output shaft, comprising:
- receiving an input control variable from an input unit;
- determining a derivative of the input control variable, said derivative being at least one of a first derivative or a second derivative;
- selecting one of a plurality of control profiles based on the control input variable and the derivative, each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft;
- and
- driving the output shaft at a rotational speed in accordance with the selected control profile.
A power tool comprising:
- a housing;
- an output member configured to rotate about a longitudinal axis;
- a motor contained in the housing and driveably connected to the output member to impart rotary motion thereto;
- an input unit configured to output an input control variable in response to a user action;
- and
- a controller in the housing configured to calculate a derivative of the input control variable, select one of a plurality of control profiles based on the control input variable and the derivative, and drive the output shaft via the motor at a rotational speed in accordance with the selected control profile, wherein each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft, the derivative being at least one of a first derivative or a second derivative.
Dependencies are inferred from the claim text.