Patent ID: 11865685
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A fastener driver comprising:
a nosepiece for receiving fasteners from a magazine;
a driver blade movable from a ready position toward a driven position during which a fastener positioned in the nosepiece is driven into a workpiece;
a lifting mechanism operable to return the driver blade from the driven position toward the ready position for a subsequent fastener driving operation; and
a drivetrain to provide torque to the lifting mechanism, the drivetrain including
an electric motor having a motor output shaft,
a first gear box coupled to the motor output shaft to receive torque therefrom,
a second gear box having an output shaft coupled to the lifting mechanism to provide torque thereto, and
a drive shaft having a first end coupled to the first gear box and a second end coupled to the second gear box for transferring torque from the first gear box to the second gear box,

wherein the first gearbox includes a first gear case and a multi-stage planetary transmission therein, and wherein the second gearbox includes a second gear case and meshed first and second spur gears therein, the second spur gear being coupled for co-rotation with the second end of the drive shaft
wherein the drivetrain further includes a single-stage planetary transmission positioned between the second spur gear and the lifting mechanism.