Patent ID: 11858100
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
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.