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

Claim 10:
11. A concrete trowel comprising:
a frame including a blade guard extending downward 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 extends into the blade guard, and 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 attached thereto; and
a quick-change coupling for selectively coupling the rotor and the drive hub, wherein the quick-change coupling is rotatable between a locked position in which the rotor is locked to the drive hub and rotates therewith and an unlocked position in which the rotor is unlocked from the drive hub to allow the rotor and the plurality of attached blades to be removed from the drive hub as a single unit, and wherein the quick-change coupling comprises a plurality of locking elements receivable within the detent groove and a rotatable cam for biasing the locking elements into engagement with the detent groove.