Tightening tool and tightening tool management system
AssigneeMakita Corporation
InventorYutaka Matsunaga
Life of this patent
Estimating the term…
Abstract
A tightening tool for tightening a fastener is disclosed which comprises a motor and a main shaft that engages with the fastener. A clutch is disposed between the motor and the main shaft so that the clutch rotates the main shaft by transmitting torque from the motor to the main shaft when a load acting on the main shaft is less than a predetermined value. The clutch shuts off torque transmission from the motor to the main shaft when the load acting on the main shaft reaches or exceeds the predetermined value. When in use, the current flowing to the motor and rotation angle of the main shaft of the motor are detected. The detected current and rotation angle are used to determine whether the tightening torque of the fastener is normal.
Claims14
A tightening tool for tightening a fastener, comprising:
- a motor;
- a main shaft which engages with the fastener;
- a clutch disposed between the motor and the main shaft, wherein the clutch rotates the main shaft by transmitting torque from the motor to the main shaft when a load acting on the main shaft is less than a predetermined value, and shuts off torque transmission from the motor to the main shaft when the load acting on the main shaft reaches or exceeds the predetermined value;
- means for detecting a current flowing to the motor;
- means for detecting a rotation angle of the main shaft or the motor;
- and
- means for determining whether or not a tightening torque of the fastener is normal based upon the rotation angle of the main shaft or the motor detected by the rotation angle detecting means during a period extending from (1) a time at which a current value detected by the current detecting means exceeds a preset value to (2) a time at which torque transmission from the motor to the main shaft is shut off.
A tightening tool for tightening a fastener, comprising:
- a motor;
- a main shaft adapted engage with the fastener;
- a clutch disposed between the motor and the main shaft, wherein the clutch rotates the main shaft by transmitting torque from the motor to the main shaft when a load acting on the main shaft is less than a predetermined value, and shuts off torque transmission from the motor to the main shaft when the load acting on the main shaft reaches or exceeds the predetermined value;
- a current detection unit detecting a current flowing to the motor;
- a sensor detecting a rotation angle of the main shaft or the motor;
- and
- a processor that determines whether or not a tightening torque of the fastener reaches or exceeds a predetermined value based upon the rotation angle of the main shaft or the motor detected by the sensor during a period extending from (1) a time at which a current value detected by the current detection unit exceeds a preset value to (2) a time at which torque transmission from the motor to the main shaft is shut off.
Dependencies are inferred from the claim text.