US 11,745,301 B2
Rotary tool
Hironori Sakai, Ibaraki (JP); Takuya Yoshinari, Ibaraki (JP); and Hironori Mashiko, Ibaraki (JP)
Assigned to Koki Holdings Co., Ltd., Tokyo (JP)
Appl. No. 16/499,319
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
PCT Filed Feb. 23, 2018, PCT No. PCT/JP2018/006761
§ 371(c)(1), (2) Date Sep. 29, 2019,
PCT Pub. No. WO2018/180083, PCT Pub. Date Oct. 4, 2018.
Claims priority of application No. 2017-066513 (JP), filed on Mar. 30, 2017; and application No. 2017-066517 (JP), filed on Mar. 30, 2017.
Prior Publication US 2020/0055159 A1, Feb. 20, 2020
Int. Cl. H02K 7/10 (2006.01); B24B 23/02 (2006.01); B24B 47/12 (2006.01); H02P 1/04 (2006.01); B25F 5/00 (2006.01); H02P 6/24 (2006.01)
CPC B24B 23/022 (2013.01) [B24B 47/12 (2013.01); B25F 5/00 (2013.01); H02P 1/04 (2013.01); H02P 6/24 (2013.01); B25F 5/008 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotary tool which rotates a spindle and a tip tool forward or backward by a motor, and uses a fixture screwed with the spindle to install the tip tool on the spindle,
the rotary tool comprising:
a switch; and
a control device which controls a rotation and a stop of the motor corresponding to an operation of the switch,
wherein when the switch is turned on, the control device is configured to perform a start control that controls the motor to a second target rotation speed higher than a first target rotation speed before controlling the motor to a constant-speed rotation at the first target rotation speed.