US 11,858,100 B2
Impact power tool
Bryan C. Kendall, Brookfield, WI (US); Taylor Crabb, Brookfield, WI (US); Nicholas E. Holstine, Wauwatosa, WI (US); Zachary J. Evans, Waukesha, WI (US); and Jacob R. Schaddel, Wauwatosa, WI (US)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Apr. 7, 2022, as Appl. No. 17/715,692.
Claims priority of provisional application 63/171,905, filed on Apr. 7, 2021.
Prior Publication US 2022/0324090 A1, Oct. 13, 2022
Int. Cl. B25D 11/12 (2006.01); B25D 16/00 (2006.01); B25D 17/04 (2006.01)
CPC B25D 11/12 (2013.01) [B25D 16/006 (2013.01); B25D 17/04 (2013.01); B25D 2211/068 (2013.01); B25D 2216/0084 (2013.01); B25D 2250/375 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An impact power tool adapted to impart axial impacts to a tool bit, the impact power tool comprising:
a housing;
a motor supported by the housing;
a spindle coupled to the motor for receiving torque from the motor to cause the spindle to rotate;
a reciprocating impact mechanism that is operable to create a variable pressure air spring within the spindle, the impact mechanism including
a striker received within the spindle that reciprocates along a reciprocation axis in response to the variable pressure air spring,
a piston that reciprocates along the reciprocation axis to induce the variable pressure air spring, and
a crankshaft configured to convert continuous rotational motion from the motor to reciprocating linear movement of the piston, the crankshaft defining a crank axis that is perpendicular to the reciprocation axis and the motor defines a motor axis that is parallel with the reciprocation axis; and
a transmission that transfers rotation from the motor to the spindle, the transmission including an intermediate shaft having a first gear engaged with a second gear supported on the spindle to transfer rotation to the spindle, the intermediate shaft defining a rotational axis that is parallel with the crank axis;
wherein a center of gravity of the impact power tool is positioned between the motor axis and the reciprocation axis; and
wherein the center of gravity of the impact tool is positioned between the crank axis and the rotational axis.