Handheld punch tool
AssigneeMilwaukee Electric Tool Corporation
InventorsJacob C. Strachan, Benjamin J. Boldt, Gerald A. Zucca
Life of this patent
Estimating the term…
Abstract
A handheld punch tool includes a housing, a die holder coupled to the housing, a die supported by the die holder, the die and the die holder defining a feed slot therebetween for receiving a workpiece to be cut, a punch configured to reciprocate within the die holder along a punch axis, an electric motor disposed within the housing and having a motor shaft configured to rotate about a motor axis to reciprocate the punch, and a flywheel mass coupled for co-rotation with the motor shaft about the motor axis.
Claims20
A handheld punch tool comprising:
- a housing;
- a die holder coupled to the housing;
- a die supported by the die holder, the die and the die holder defining a feed slot therebetween for receiving a workpiece to be cut;
- a punch configured to reciprocate within the die holder along a punch axis;
- an electric motor disposed within the housing and having a motor shaft configured to rotate about a motor axis to reciprocate the punch;
- and
- a flywheel mass coupled for co-rotation with the motor shaft about the motor axis,
- wherein the flywheel mass is a fan rotatable to generate an airflow for cooling the electric motor, and
- wherein the fan has a rotational inertia equal to at least 50% of a total rotational inertia of a rotating assembly including the fan and the motor shaft.
A handheld punch tool comprising:
- a housing;
- a punch configured to reciprocate along a punch axis;
- an electric motor disposed within the housing and having a motor shaft configured to rotate about a motor axis to reciprocate the punch along the punch axis, wherein the motor axis is transverse to the punch axis;
- and
- a flywheel mass coupled for co-rotation with the motor shaft about the motor axis,
- wherein the flywheel mass has a rotational inertia of at least 6.0 kg-mm2.
A handheld punch tool comprising:
- a housing;
- a punch configured to reciprocate along a punch axis;
- an electric motor disposed within the housing and having a motor shaft configured to rotate about a motor axis to reciprocate the punch along the punch axis, wherein the motor axis is transverse to the punch axis;
- a battery receptacle configured to receive a battery along a battery axis to provide power to the electric motor, wherein the battery axis is transverse to the punch axis;
- and
- a flywheel mass coupled for co-rotation with the motor shaft about the motor axis,
- wherein the flywheel mass has a rotational inertia between 40% and 60% of a total rotational inertia of a rotating assembly including the flywheel mass and the motor shaft.
Dependencies are inferred from the claim text.