US 11,701,722 B2
Reciprocating tool
Tetsuya Monzen, Hitachinaka (JP); and Ryosuke Nakano, Hitachinaka (JP)
Assigned to KOKI HOLDINGS CO., LTD., Tokyo (JP)
Appl. No. 16/618,032
Filed by KOKI HOLDINGS CO., LTD., Tokyo (JP)
PCT Filed Apr. 27, 2018, PCT No. PCT/JP2018/017227
§ 371(c)(1), (2) Date Nov. 27, 2019,
PCT Pub. No. WO2018/221105, PCT Pub. Date Dec. 6, 2018.
Claims priority of application No. 2017-108373 (JP), filed on May 31, 2017; application No. 2017-254184 (JP), filed on Dec. 28, 2017; and application No. 2018-069786 (JP), filed on Mar. 30, 2018.
Prior Publication US 2020/0094432 A1, Mar. 26, 2020
Int. Cl. B27B 3/26 (2006.01); B23D 51/10 (2006.01); B23D 51/16 (2006.01); B27B 19/09 (2006.01); B25F 5/00 (2006.01)
CPC B23D 51/16 (2013.01) [B23D 51/10 (2013.01); B25F 5/006 (2013.01); B27B 3/26 (2013.01); B27B 19/09 (2013.01); Y10T 74/18256 (2015.01)] 14 Claims
OG exemplary drawing
 
1. A reciprocating tool comprising:
a housing;
a motor accommodated in the housing and including a rotating shaft;
an output part reciprocally and movably supported by the housing between a first position and a second position, the output part being configured to hold an end bit;
a first rotary body rotatable in a first direction about an axis extending in a predetermined direction intersecting a reciprocating direction of the output part by receiving a drive force of the motor; and
a second rotary body rotatable in a second direction about the axis by receiving the drive force of the motor, the second direction being opposite to the first direction, wherein:
the first rotary body comprises:
a first gear part rotatable about the axis by receiving the drive force of the motor;
a protruding part provided at an eccentric position with respect to the axis; and
a first weight part rotatable together with the first gear part,
the output part is provided with a guide to transmit the drive force in the reciprocating direction to the output part by receiving the rotation of the protruding part,
the second rotary body comprises:
a second gear part rotatable about the axis by receiving the drive force of the motor; and
a second weight part rotatable together with the second gear part,
a mass of the first rotary body includes a mass of the protruding part and a mass of the first weight part, and a mass of the second rotary body includes a mass of the second weight part, and
a product of a first distance and the mass of the first rotary body is equivalent to a product of a second distance and the mass of the second rotary body, the first distance being a radial distance of the first rotary body from the axis to a center of gravity of the first rotary body, and the second distance being a radial distance of the second rotary body from the axis to a center of gravity of the second rotary body,
wherein:
the first rotary body further comprises an orbital guide rotatable together with the first gear part about the axis;
the orbital guide has a circular shape whose center is coincident with the axis, the orbital guide has an outer edge portion, the outer edge portion having a vertical thickness that varies along a circumferential direction,
the housing is provided with a support part slidably supporting the output part,
the support part comprises:
a receiving part contactable with a part of an end portion of the outer edge portion in a thickness direction; and
a swinging shaft;
when the orbital guide is rotated, the support part is pivotally movable about the swinging shaft with respect to the housing with a change in a contact position in an axial direction between the end portion of the outer edge portion and the receiving portion, and
the mass of the first rotary body includes a mass of the orbital guide.