US 12,442,202 B2
Concrete trowel
Ian C. Richards, Shorewood, WI (US); and Will Didier, Cedarburg, WI (US)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Feb. 24, 2022, as Appl. No. 17/679,360.
Claims priority of provisional application 63/153,057, filed on Feb. 24, 2021.
Prior Publication US 2022/0268036 A1, Aug. 25, 2022
Int. Cl. E04F 21/24 (2006.01); E01C 19/42 (2006.01)
CPC E04F 21/248 (2013.01) [E01C 19/42 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A concrete trowel comprising:
a frame;
a drive assembly including an electric motor mounted on the frame having an output shaft extending from the motor defining a drive axis, a gear box having an input shaft that is rotatably driven by the output shaft of the motor, and a drive hub coupled to an output shaft of the gear box for rotation with the output shaft;
a post extending from the frame;
a pair of handlebars coupled to the post for controlling the trowel;
a battery pack for supplying electrical power to the motor;
a rotor including a plurality of blades, the rotor rotatably coupled to the drive assembly for rotating with the drive hub, wherein the output shaft of the motor, the input shaft and output shaft of the gear box, the drive hub, and the rotor are all coaxial along a rotational axis that is coaxial with the drive axis;
a blade pitch adjustment knob coupled to the post or the handlebars;
a blade adjustment yoke pivotably coupled to the drive hub; and
an adjustment cable having a first end coupled to the blade adjustment yoke,
wherein the blade pitch adjustment knob is coupled to a second end of the adjustment cable, and wherein the blade pitch adjustment knob is configured to selectively tension the adjustment cable and pivot the blade adjustment yoke with respect to the drive hub, and
wherein pivoting the blade adjustment yoke adjusts a pitch of the blades relative to the work surface.