US 12,427,638 B2
Percussion tool
John Bloom-Edmonds, Menomonee Falls, WI (US); Kyle Krause, Milwaukee, WI (US); Jeffery D. Spraggon, Pewaukee, WI (US); and Andrew D. Van Hoorn, Menomonee Falls, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Dec. 14, 2023, as Appl. No. 18/539,983.
Claims priority of provisional application 63/476,197, filed on Dec. 20, 2022.
Prior Publication US 2024/0198505 A1, Jun. 20, 2024
Int. Cl. B25D 11/04 (2006.01); B25D 11/12 (2006.01)
CPC B25D 11/04 (2013.01) [B25D 11/125 (2013.01); B25D 2250/035 (2013.01); B25D 2250/365 (2013.01); B25D 2250/375 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A percussion tool adapted to impart axial impacts to a tool bit, the percussion tool comprising:
a housing;
a motor supported by the housing;
a spindle supported by the housing and including a plurality of radial air vents;
a reciprocation mechanism operable to create a variable pressure air spring within the spindle;
a striker received within the spindle for reciprocation in response to a pressure of the variable pressure air spring;
an anvil received within the spindle and configured to be impacted by the striker, the anvil configured to transmit axial impacts from the striker to the tool bit;
a chuck for securing the tool bit to the spindle; and
a parking assembly movable relative to the spindle to selectively open and close the plurality of radial air vents, the parking assembly including
a seat coupled to the spindle,
a first shuttle portion movable relative to an outer surface of the spindle, the first shuttle portion including an inner surface and an annular recess in the inner surface,
an elastomeric ring is positioned within the annular recess, the elastomeric ring configured to cover the plurality of radial air vents in a working position,
a biasing member positioned between the seat and the first shuttle portion,
a second shuttle portion movable relative to the outer surface of the spindle,
a bushing positioned within the spindle and configured to receive a portion of the anvil, and
a fastener that couples the second shuttle portion to the bushing,
wherein the first shuttle portion and the second shuttle portion are movable together between the working position, in which the plurality of radial air vents is closed, and an idle position, in which the plurality of radial air vents is open, and wherein the biasing member is configured to bias the first shuttle portion and the second shuttle portion into the idle position.