SWITCHABLE ANTI-LOCK CONTROL
First Claim
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1. A power tool comprising:
- a housing;
a motor assembly in the housing, the motor assembly including an output member and a motor for translating the output member;
a kickback sensor that senses an operational rate of change of one of the motor and output member and produces an output in response thereto;
an anti-kickback control device that removes energy from the output member in response to the output of the kickback sensor; and
a switch having a first setting and a second setting, the first setting corresponding to a first operating condition of the anti-kickback control device and the second setting corresponding to a second operating condition of the anti-kickback control device.
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Abstract
A power tool can include a housing and a motor assembly in the housing. The motor assembly can include an output member and a motor for translating the output member. A kickback sensor can sample successive periods of current through the motor and produce an output in response thereto. An anti-kickback control device can remove energy from the output member in response to the output of the kickback sensor. A switch can have a first setting and a second setting. The first setting can correspond to a first operating condition of the anti-kickback control device. The second setting can correspond to a second operating condition of the anti-kickback control device.
122 Citations
20 Claims
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1. A power tool comprising:
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a housing; a motor assembly in the housing, the motor assembly including an output member and a motor for translating the output member; a kickback sensor that senses an operational rate of change of one of the motor and output member and produces an output in response thereto; an anti-kickback control device that removes energy from the output member in response to the output of the kickback sensor; and a switch having a first setting and a second setting, the first setting corresponding to a first operating condition of the anti-kickback control device and the second setting corresponding to a second operating condition of the anti-kickback control device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power tool comprising:
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a housing; a motor assembly in the housing, the motor assembly including an output member and a motor for translating the output member; a kickback sensor that samples successive periods of current through said motor and produces an output in response thereto; an anti-kickback control device that stops the motor in response to the output of the kickback sensor; and a visual indicator, wherein the anti-kickback control device communicates a signal to the visual indicator based on the output of the kickback sensor. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of eliminating kickback in a power tool of the type having an output spindle driven by an electric motor, the electric motor being supplied with current from an AC source, the method comprising:
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sampling successive periods of current through the motor; determining a rate of change of the current in response to the sampling; comparing the rate of change to a threshold; determining a selected position of a user actuated control switch having at least a first position and a second position; and removing energy from the output spindle in response to the comparison and the position of the user actuated control switch. - View Dependent Claims (17, 18, 19, 20)
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Specification