Concrete trowel

Patent metadata

Field	Value
Publication number	US-12442202-B2
Application number	US-202217679360-A
Country	US
Kind code	B2
Filing date	Feb 24, 2022
Priority date	Feb 24, 2021
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A concrete trowel includes 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 guide handle extending from the frame for controlling the trowel, a battery pack for supplying electrical power to the motor, and a rotor including a plurality of blades, the rotor rotatably coupled to the drive assembly for rotating about a rotational axis that is coaxial with the drive axis.

First claim

What is claims is:

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.

2. The concrete trowel of claim 1 , wherein the drive hub is configured to transfer torque to the rotor.

3. The concrete trowel of claim 2 , wherein the output shaft is oriented perpendicular to a work surface.

4. The concrete trowel of claim 1 , further comprising an operator control unit mounted on one of the handlebars.

5. The concrete trowel of claim 4 , wherein the operator control unit includes an ON/OFF switch.

6. The concrete trowel of claim 5 , wherein the operator control unit further includes a speed adjustment switch.

7. The concrete trowel of claim 1 , wherein the battery pack is supported on the frame.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Richards Ian C
• Didier Will

Classifications

• E01C19/42

  Machines for imparting a smooth finish to freshly-laid paving courses other than by rolling, tamping or vibrating (for distributing only E01C19/12; {hand-actuated smoothing tools E01C19/44}) · CPC title

• E04F21/248 Primary

  used by an operator walking behind the trowel, i.e. walk-behind power trowels · CPC title