Back to results
US 11,015,759 B2Granted
Power tool and kickback detection method therefor
AssigneeNanjing Chervon Industry Co., Ltd.
InventorsYongan Sun, Ailong Zou
Life of this patent
Estimating the term…
Abstract
A power tool and a detection method for the power tool. The detection method includes collecting acceleration data, via use of an acceleration sensor of the power tool, along a tangential direction of a rotation axis of a working portion of the power tool, determining whether a proportion of the collected acceleration data that exceeds a first acceleration threshold in a preset time window exceeds a preset value, and determining that a kickback occurs in the power tool when the proportion exceeds the preset value.
Claims16
A detection method for a power tool, comprising:
- collecting a plurality of acceleration data points within a preset time window, via use of an acceleration sensor of the power tool, along a tangential direction of a rotation axis of a working portion of the power tool, wherein each of the plurality of acceleration data points is a digital signal;
- calculating a proportion representative of the number of collected acceleration data points whose acceleration value exceeds a first acceleration threshold to the total number of collected acceleration data points within the preset time window, wherein the acceleration data points whose acceleration exceeds a first acceleration threshold may be non-adjacent acceleration data points;
- determining whether the calculated proportion exceeds a preset proportion value;
- and
- determining that a kickback occurs in the power tool when the calculated proportion exceeds the preset proportion value.
2 more elements
A power tool, comprising:
- a housing, a power supply module, an electric motor, a control switch, a working portion, an acceleration sensor and a control module, wherein the power supply module, the electric motor, the control switch, the acceleration sensor and the control module are disposed in the housing, the power supply module is electrically connected to the electric motor via the control switch and configured to supply power to the electric motor according to control of the control switch to drive the electric motor to rotate, the electric motor is fixedly connected to the working portion and configured to drive the working portion to rotate when the electric motor is rotating,
- the acceleration sensor is configured to detect acceleration along a tangential direction of a rotation axis of the working portion when the working portion is rotating, and the control module is electrically connected to the acceleration sensor and configured to:
- collect discrete acceleration data points detected by the acceleration sensor during a preset time window;
- calculate a proportion representative of the number of collected acceleration data points that exceeds a first acceleration threshold to the total number of discrete acceleration data points collected;
- determine whether the proportion exceeds a preset proportion value;
- and
- determine that a kickback occurs in the power tool when the proportion exceeds the preset proportion value, even when at least one of the discrete acceleration data points detected during the preset time window is below the first acceleration threshold.
4 more elements
Dependencies are inferred from the claim text.