US 12,005,556 B2
Driving work machine
Kento Shiina, Ibaraki (JP); Takahiro Ookubo, Ibaraki (JP); and Satoshi Abe, Ibaraki (JP)
Assigned to KOKI HOLDINGS CO., LTD., Tokyo (JP)
Appl. No. 17/434,323
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
PCT Filed Mar. 6, 2020, PCT No. PCT/JP2020/009808
§ 371(c)(1), (2) Date Aug. 26, 2021,
PCT Pub. No. WO2020/195725, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-062892 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0161406 A1, May 26, 2022
Int. Cl. B25D 16/00 (2006.01); B25D 17/24 (2006.01)
CPC B25D 16/006 (2013.01) [B25D 17/24 (2013.01); B25D 2211/006 (2013.01); B25D 2211/061 (2013.01); B25D 2216/0023 (2013.01); B25D 2216/0038 (2013.01); B25D 2222/57 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A driving work machine comprising:
a cylinder configured to apply a rotational force to a tip tool;
a piston attached to be able to reciprocate in an axis direction inside the cylinder and configured to apply a striking force to the tip tool;
a driving source configured to generate a power for driving the cylinder and the piston;
a switching part configured to make switching between at least two operational states including a rotational striking state of transmitting the power as a striking force and a rotational force to the tip tool and a rotational state of transmitting the power as the rotational force but not transmitting the power as the striking force to the tip tool;
a housing configured to house the cylinder, the driving source and the switching part; and
a spring member arranged between the housing and the switching part and configured to urge the switching part to move forward,
wherein the cylinder includes a pushing part pushing the switching part rearward when the cylinder is moved rearward by a reactive force of the pressing of the tip tool against a workpiece,
wherein the switching part is configured to switch an operational state of the cylinder in response to the pushing part pushing the switching part,
wherein the housing includes a preventing surface configured to prevent an amount of the rearward movement of the switching part,
wherein the driving work machine further comprises an anti-vibration part in addition to the spring member, the anti-vibration part being arranged between the pushing part and the preventing surface,
wherein the anti-vibration part remains between the pushing part and preventing surface when the preventing surface prevents the rearward movement of the switching part, and
wherein the anti-vibration part is arranged between the switching part and the pushing part.