Power tool having a non-linear trigger-speed profile
AssigneeBlack & Decker Inc.
InventorsMichael K. Forster, Jason K. Leh, Wing W. Lin
Life of this patent
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Abstract
A power tool including a motor, an input unit such as a variable-speed trigger switch, and a controller is provided. The controller controls the speed of the motor as a function of the input level indicated by the electrical signal from the input unit. The function is a first expression within a first predetermined range of the input level and a second expression within a second predetermined range of the input level, where the second expression corresponds to a polynomial of a second degree or higher and is different from the first expression
Claims20
A power tool comprising:
- a motor;
- an input unit actuated by a user;
- and
- a control unit configured to receive an electrical signal from the input unit and control the speed of the motor as a function of an input level indicated by the electrical signal from the input unit, the function being a first expression within a first predetermined range of the input level and a second expression within a second predetermined range of the input level, wherein the second expression corresponds to a polynomial of a second degree or higher and is different from the first expression.
A method of controlling speed of a motor within a power tool having an input unit, comprising:
- receiving a signal from the input unit indicative of an input level;
- and
- controlling the speed of the motor as a function of the input level, the function being a first expression within a first predetermined range of the input level and a second expression within a second predetermined range of the input level, wherein the second expression corresponds to a polynomial of a second degree or higher and is different from the first expression.
Dependencies are inferred from the claim text.