ALEXANDRIA, Va., June 16 -- United States Patent no. 12,303,985, issued on May 20, was assigned to MAKITA Corp. (Anjo, Japan).
"Driver drill" was invented by Hidenori Nagasaka (Anjo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A driver-drill (1) includes a motor (16), a spindle (32), which is rotationally driven using rotational energy output by the motor (16), and a chuck (30), which rotates integrally with the spindle (32). The chuck (30) includes: a chuck body (31); a chuck sleeve (80), which is externally mounted on the chuck body (31); and two or more chuck jaws (67), which are provided in the chuck body (31) and which expand contract relative to the rotational axis of the spindle (32) in respo...