ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,544,886, issued on Feb. 10, was assigned to MAKITA Corp. (Anjo, Japan).
"Impact tool" was invented by Yasuhito Kawai (Anjo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An impact tool (1) includes: a motor (6); a spindle (8) rotated by the motor; a spindle groove (8D) formed in the spindle; a ball (48) held in the spindle groove; a hammer (47) supported on the spindle via the ball; a spring (49, 50), which biases the hammer forward; and an anvil (10) configured to be impacted by the hammer in a rotational direction. The depth of the spindle groove (8D) differs in accordance with the location thereof in an axial direction of the spindle."
The pa...