US 12,330,273 B2
Impact rotary tool
Akiko Honda, Osaka (JP); Masaya Sato, Mie (JP); Takahiro Ueda, Okayama (JP); Kimitaka Ozawa, Osaka (JP); and Takashi Kusagawa, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on May 26, 2023, as Appl. No. 18/324,762.
Claims priority of application No. 2022-093317 (JP), filed on Jun. 8, 2022.
Prior Publication US 2023/0398664 A1, Dec. 14, 2023
Int. Cl. B25B 21/02 (2006.01)
CPC B25B 21/02 (2013.01) 6 Claims
OG exemplary drawing
 
1. An impact rotary tool comprising:
a hammer configured to rotate upon receiving motive power from a motor;
an anvil configured to rotate upon receiving, from the hammer, impacting force in a rotational direction of the hammer;
an output shaft configured to hold a tip tool thereon and rotate along with the anvil upon receiving, from the anvil, force in a rotational direction of the anvil;
a housing that houses the hammer and the anvil;
a bearing held by the housing and supporting the output shaft rotatably; and
a buffer member including an elastic member configured to be elastically deformed in a thrusting direction aligned with a rotational axis of the output shaft,
the anvil having a first facing region facing the output shaft in the thrusting direction,
the output shaft having a second facing region facing the first facing region in the thrusting direction,
the buffer member being interposed between the anvil and the output shaft,
the elastic member being compressed in the thrusting direction under a load transmitted in the thrusting direction from the hammer,
the buffer member being configured to regulate a gap distance between the second facing region and the first facing region such that when a maximum load is transmitted from the hammer to the elastic member, the second facing region faces the first facing region with a gap left between the second facing region and the first facing region in the thrusting direction, and
the bearing being a member having a ringlike shape and an inner surface of the bearing being in contact with the anvil and the output shaft.