US 12,186,875 B2
Working tool
Tetsuhito Shige, Ibaraki (JP); Tatsuya Ito, Ibaraki (JP); Daiki Kiyohara, Ibaraki (JP); and Hiroaki Irei, Ibaraki (JP)
Assigned to KOKI HOLDINGS CO., LTD., Tokyo (JP)
Appl. No. 17/922,092
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
PCT Filed Mar. 31, 2021, PCT No. PCT/JP2021/013760
§ 371(c)(1), (2) Date Oct. 28, 2022,
PCT Pub. No. WO2021/220703, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2020-078805 (JP), filed on Apr. 28, 2020.
Prior Publication US 2023/0166390 A1, Jun. 1, 2023
Int. Cl. B25F 5/00 (2006.01); B25C 1/06 (2006.01)
CPC B25F 5/00 (2013.01) [B25C 1/06 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A working tool comprising:
a drive source;
a control circuit configured to control driving of the drive source;
a first operation unit operable to be switched between a first ON position and a first OFF position by an operation of a worker; and
a second operation unit operable to be switched between a second ON position and a second OFF position by the operation of the worker,
wherein the working tool is in an initial state when the first operation unit is at the first OFF position and the second operation unit is at the second OFF position,
wherein the control circuit has a first mode and a second mode,
wherein the control circuit is configured to make
a first ON determination to determine that the first operation unit has moved from the first OFF position to the first ON position,
a first OFF determination to determine that the first operation unit has moved from the first ON position to the first OFF position,
a second ON determination to determine that the second operation unit has moved from the second OFF position to the second ON position, and
a second OFF determination to determine that the second operation unit has moved from the second ON position to the second OFF position,
wherein the control circuit makes
the first OFF determination when the first OFF position is maintained until a first OFF determination time elapses after the first operation unit moves from the first ON position to the first OFF position, and
the second OFF determination when the second OFF position is maintained until a second OFF determination time elapses after the second operation unit moves from the second ON position to the second OFF position,
wherein, in the first mode,
in the initial state in response to determining that the second ON determination is made and the first ON determination is made while the second operation unit is maintained at the second ON position, the control circuit drives the drive source, and
when the drive source is driven and then, in response to the second OFF determination time passing after the second operation unit moves from the second ON position to the second OFF position, the second OFF determination is made, the control circuit does not drive the drive source again, unless the first OFF determination is made after the first operation unit moves from the first ON position to the first OFF position so that the working tool returns to the initial position,
wherein, in the second mode,
in the initial state, in response to determining that the first ON determination is made and the second ON determination is made while the first operation unit is maintained at the first ON position, the control circuit drives the drive source, and
when the drive source is driven and then, in response to the second OFF determination time passing after the second operation unit moves from the second ON position to the second OFF position while the first operation unit is maintained at the first ON position, the second OFF determination is made, and then the second ON determination is made again, the control circuit drives the drive source, and
wherein the second OFF determination time in the second mode is set longer than the second OFF determination time in the first mode.