US 12,134,174 B2
Driving device
Kohei Fujisawa, Ibaraki (JP)
Assigned to KOKI HOLDINGS CO., LTD., Tokyo (JP)
Appl. No. 17/780,674
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
PCT Filed Oct. 30, 2020, PCT No. PCT/JP2020/040882
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/106495, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-215115 (JP), filed on Nov. 28, 2019.
Prior Publication US 2023/0010405 A1, Jan. 12, 2023
Int. Cl. B25C 1/04 (2006.01)
CPC B25C 1/047 (2013.01) [B25C 1/046 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A driving device, comprising:
a housing;
a striking unit arranged in the housing;
a first pressure chamber arranged in the housing and configured to operate the striking unit by gas pressure;
a valve seat fixed in the housing;
a passage connecting the first pressure chamber and outside of the housing through the valve seat that has an opening for the passage; and
a valve body operably provided in the housing and arranged outside the first pressure chamber, and configured to open and close the opening of the passage by coming into and out of contact with the valve seat,
wherein the valve body includes a contact portion and a non-contact portion,
wherein the valve seat has a first area including an edge of the opening, and has a second area other than the first area,
wherein the valve body opens and closes the opening of the passage,
wherein when the valve body closes the opening of the passage, the contact portion overlaps with the second area, and
wherein the non-contact portion comprises a depression away from the opening, and when the valve body closes the opening of the passage, the non-contact portion overlaps with the first area of the valve seat.