US 9,808,925 B2
Impact tool
Hideki Yamada, Hitachinaka (JP); Takahiro Ookubo, Hitachinaka (JP); and Satoshi Abe, Hitachinaka (JP)
Assigned to HITACHI KOKI CO., LTD., Tokyo (JP)
Appl. No. 14/378,601
Filed by HITACHI KOKI CO., LTD., Tokyo (JP)
PCT Filed Mar. 19, 2013, PCT No. PCT/JP2013/001879
§ 371(c)(1), (2) Date Aug. 13, 2014,
PCT Pub. No. WO2013/140793, PCT Pub. Date Sep. 26, 2013.
Claims priority of application No. 2012-065221 (JP), filed on Mar. 22, 2012; application No. 2012-083195 (JP), filed on Mar. 30, 2012; application No. 2012-083196 (JP), filed on Mar. 30, 2012; application No. 2012-083217 (JP), filed on Mar. 30, 2012; and application No. 2012-218648 (JP), filed on Sep. 28, 2012.
Prior Publication US 2016/0052119 A1, Feb. 25, 2016
Int. Cl. B25D 17/24 (2006.01); B25D 11/00 (2006.01); B25D 17/20 (2006.01)
CPC B25D 17/24 (2013.01) [B25D 11/00 (2013.01); B25D 17/20 (2013.01); B25D 2211/006 (2013.01); B25D 2211/061 (2013.01); B25D 2217/0061 (2013.01); B25D 2217/0092 (2013.01); B25D 2222/57 (2013.01); B25D 2250/245 (2013.01); B25D 2250/331 (2013.01); B25D 2250/391 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An impact tool comprising:
a casing that supports a tip tool;
a moving member that is reciprocatably provided in the casing and generates impact force to be transmitted to the tip tool;
an electric motor that is provided in the casing and has an output shaft;
a motion converting mechanism that is provided in the casing, converts rotary motion of the output shaft to reciprocating motion, and transmits the reciprocating motion to the moving member; and
a vibration reducing mechanism that is movably provided in the casing and reduces a vibration of the casing,
wherein the vibration reducing mechanism includes:
a supporting member that is provided to be swingable in a direction of a center line of reciprocation of the moving member with using a fixing position provided on the casing as a supporting point; and
a weight that is attached to a location of the supporting member close to a free end relative to the fixing position, in a plane including the center line, a gravity center of the weight and the fixing position are disposed at mutually different locations in a radial direction of the center line, in the plane including the center line, the fixing position is disposed on a side of a gravity center of the impact tool relative to the center line, the supporting member has a hole penetrating therethrough in a direction along an axis of the output shaft, and the output shaft is inserted in the hole.