US 12,459,084 B2
Working device
Kengo Tamura, Ibaraki (JP); Junichi Toukairin, Ibaraki (JP); and Shota Takeuchi, Ibaraki (JP)
Assigned to Koki Holdings Co., Ltd., Tokyo (JP)
Appl. No. 18/009,474
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
PCT Filed Jun. 11, 2021, PCT No. PCT/JP2021/022240
§ 371(c)(1), (2) Date Dec. 9, 2022,
PCT Pub. No. WO2022/004330, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2020-112437 (JP), filed on Jun. 30, 2020.
Prior Publication US 2023/0147598 A1, May 11, 2023
Int. Cl. B25B 21/00 (2006.01); B25B 23/18 (2006.01); B25F 5/02 (2006.01)
CPC B25B 21/00 (2013.01) [B25B 23/18 (2013.01); B25F 5/02 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A working device comprising:
a drive unit that generates a driving force;
an energy supply unit that supplies energy to the drive unit;
a power transmission unit that is driven by the drive unit;
an enclosure portion accommodating the drive unit, the energy supply unit, and the power transmission unit; and
a cover portion that covers at least a part of an outer surface of the enclosure portion,
wherein the working device has an airflow passage formed between an inner surface of the cover portion and the outer surface of the enclosure portion,
wherein the airflow passage includes at least one vent communicating the airflow passage with outside air, and
wherein the cover portion is supported to be movable relative to the enclosure portion such that vibration generated during operation of the working device causes the cover portion to move, resulting in fluctuation of a volume of the airflow passage and allowing outside air to flow into and out of the airflow passage through the at least one vent.