Patent ID: 11927022
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 7:
8. A concrete trowel comprising:
a frame including a blade guard extending therefrom;
a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor, wherein the drive hub includes a receiving portion having a detent groove and the rotor includes an attachment portion that extends into the receiving portion;
a rotor rotatable about a rotational axis within the blade guard and including a plurality of blades; and
a quick-change coupling for selectively attaching the rotor and the drive hub for co-rotation therewith, wherein the quick-change coupling is rotatable between a locked position in which the rotor is locked to the drive hub and an unlocked position in which the rotor is unlocked from the drive hub, wherein the quick-change coupling comprises a plurality of locking elements receivable within the detent groove, and wherein the quick-change coupling further comprises a cam for biasing the locking elements into engagement with the detent groove.