US 12,303,985 B2
Driver drill
Hidenori Nagasaka, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on May 25, 2022, as Appl. No. 17/664,933.
Claims priority of application No. 2021-094609 (JP), filed on Jun. 4, 2021.
Prior Publication US 2022/0388074 A1, Dec. 8, 2022
Int. Cl. B23B 31/12 (2006.01); B25F 5/00 (2006.01)
CPC B23B 31/1238 (2013.01) [B23B 2260/008 (2013.01); B25F 5/001 (2013.01); Y10T 279/17632 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A driver-drill, comprising:
a motor;
a spindle configured to be rotationally driven using rotational energy output by the motor; and
a chuck, which rotates integrally with the spindle;
wherein:
the chuck comprises: a chuck body; a chuck sleeve, which is externally mounted on the chuck body; and two or more chuck jaws, which are provided in the chuck body and are configured to radially spread apart and converge together relative to a rotational axis of the spindle in response to manual rotation of the chuck sleeve;
the spindle is formed integrally with the chuck body such that there is no seam between the spindle and the chuck body;
the spindle extends in a front-rear direction within a tube-shaped housing that protrudes forward;
a rear end of the spindle is rotatably supported by a first bearing within the tube-shaped housing;
the chuck body is rotatably supported by a second bearing;
the second bearing is disposed forward of the first bearing within the tube-shaped housing;
the second bearing mates with a receiving surface defined on an inner-circumferential surface of the tube-shaped housing and is held within the tube-shaped housing; and
the second bearing is retained by a bearing retainer that is screwed into the receiving surface forward of the second bearing.