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US 10,883,660 B2Granted
Electric power tool, and method for detecting kickback of electric power tool from workpiece
AssigneeMakita Corporation
InventorsTakeshi Nishimiya, Hirokatsu Yamamoto
Life of this patent
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Abstract
An electric power tool in one aspect of the present disclosure comprises a main body, a motor, a driver, a detector, and a kickback determiner. The kickback determiner determines that the main body is kicked back from a workpiece when an attitude change amount of the main body detected by the detector exceeds a preset kickback determination threshold during driving of the motor by the driver.
Claims15
An electric power tool comprising:
- a main body configured to be mounted with a tool portion, the tool portion being configured to process a workpiece;
- a motor configured to generate a driving force for driving the tool portion mounted to the main body;
- a driver configured to drive the motor;
- a detector configured to detect a parameter related to movement of the main body;
- a kickback determiner configured to determine that the main body is kicked back from the workpiece when the parameter detected by the detector exceeds a preset kickback determination threshold during driving of the motor by the driver;
- and
- an activator configured to activate the kickback determiner in response to the activator determining a load applied from the tool portion to the main body exceeds a preset load threshold during driving of the motor,
- wherein the activator is configured to activate the kickback determiner during a time period from when a first signal is received indicating the load exceeds a preset operation start determination threshold until a second signal is received indicating a clear-delay time has elapsed after the load falls below a preset operation end determination threshold.
5 more elements
A method for detecting kickback of an electric power tool from a workpiece comprising:
- detecting a parameter related to movement of at least a part of the electric power tool when the electric power tool is being driven;
- determining that a processing operation of the workpiece by the electric power tool is ongoing during a time period from when a circuit determines that a load applied to the electric power tool exceeds a preset load threshold during driving of the electric power tool until a clear-delay time has elapsed after the load falls below a preset operation end determination threshold;
- determining whether the parameter exceeds a preset threshold in response to a determination that the processing operation by the electric power tool is ongoing;
- and
- determining that the electric power tool is kicked back from the workpiece when the parameter exceeds the preset threshold.
2 more elements
Dependencies are inferred from the claim text.