US 12,109,634 B2
Power tool
Kiyonobu Yoshikane, Anjo (JP); Yoshitaka Machida, Anjo (JP); and Kazuki Nakagawa, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on May 24, 2022, as Appl. No. 17/752,360.
Claims priority of application No. 2021-105886 (JP), filed on Jun. 25, 2021.
Prior Publication US 2022/0410282 A1, Dec. 29, 2022
Int. Cl. B23B 45/02 (2006.01); B25F 5/00 (2006.01); F16D 55/02 (2006.01)
CPC B23B 45/02 (2013.01) [B25F 5/008 (2013.01); F16D 55/025 (2013.01); B23B 2260/122 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power tool comprising:
a motor that includes a motor body and a motor shaft, the motor body including a stator and a rotor, the motor shaft extending from the rotor and being rotatable around a first rotational axis;
a final output shaft that is configured to be rotationally driven around a second rotational axis by torque transmitted from the motor shaft;
a tool body that houses the motor and the final output shaft;
a detection device that is configured to detect a locking state of the final output shaft; and
a mechanical braking device that is configured to directly act on the motor shaft to frictionally brake the motor shaft in response to detection of the locking state, wherein:
the braking device comprises a first rotation member that is fixed to the motor shaft such that the first rotation member rotates integrally with the motor shaft, and
the braking device further comprises:
a brake member that is configured to frictionally engage with the first rotation member to brake the motor shaft;
at least one first biasing member that is configured to bias the brake member away from the first rotation member; and
a pressing member that is (i) a separate member from the brake member, and (ii) configured to press the brake member against the first rotation member, against biasing force of the at least one first biasing member by moving the pressing member toward the brake member, in response to the detection of the locking state.