Control scheme for detecting and preventing torque conditions in a power tool
First Claim
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1. A control scheme for a power tool having a rotary shaft, comprising:
- monitoring rotational motion of the tool generally about a longitudinal axis of the shaft;
detecting a condition of the tool based on the rotational motion of the tool; and
controlling torque imparted to the shaft upon detecting the tool condition, where the torque is inversely related to an angular displacement of the tool about the longitudinal axis of the shaft.
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Abstract
A control scheme is provided for a power tool having a rotary shaft. The control scheme includes: monitoring rotational motion of the tool generally about a longitudinal axis of the shaft; detecting a condition of the tool based on the rotational motion of the tool; and controlling torque imparted to the shaft upon detecting the tool condition, where the torque is inversely related to an angular displacement of the tool about the longitudinal axis of the shaft.
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Citations
24 Claims
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1. A control scheme for a power tool having a rotary shaft, comprising:
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monitoring rotational motion of the tool generally about a longitudinal axis of the shaft; detecting a condition of the tool based on the rotational motion of the tool; and controlling torque imparted to the shaft upon detecting the tool condition, where the torque is inversely related to an angular displacement of the tool about the longitudinal axis of the shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A control system suitable for use in a power tool, comprising:
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a motor drivably coupled to a rotary shaft to impart rotary motion thereon; a rotational rate sensor disposed within the tool and operable to detect rotational motion of the tool generally about a longitudinal axis of the shaft; and a controller electrically connected to the rotational rate sensor, the controller operable to detect a rotational condition of the tool based on the rotational motion detected by the sensor and control torque imparted to the rotary shaft upon detecting the rotational condition of the tool, wherein the torque is inversely related to an angular displacement of the tool about the longitudinal axis. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A control scheme for a power tool having a motor drivably coupled to a rotary shaft, comprising:
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monitoring rotational motion of the tool generally about a longitudinal axis of the shaft; detecting a rotational condition of the tool based on the rotational motion of the tool; and upon detecting the rotational condition, pulsing the torque imparted to the shaft such that the time between pulses enables the operator to regain control of the tool. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification