The present invention relates to powered concrete trowels, and more particularly to battery powered concrete finishing trowels.
Powered concrete trowels are typically used for finishing concrete surfaces and generally include a gas-powered motor mounted on a frame or “cage” that surrounds a rotor having a plurality of concrete trowel blades. The motor typically includes a rotatable output (e.g., an output shaft) oriented parallel to a work surface and linked to the rotor by a combination of a belt drive and a worm-style gear box. The rotor is rotatably driven by the rotatable output of the motor, which rotates the blades on a concrete surface. The trowel is controlled by an operator via a handle extending from the cage. However, many gas-powered trowels are noisy to use and are unable to fit in tighter workspaces. In addition, traditional worm gear mechanisms can be unreliable in the long run and lead to substantial power losses in the rotor drive system.
The present invention provides, in one aspect, a concrete trowel including 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.
In another aspect, the present invention includes a concrete trowel having 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 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, 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.
In yet another aspect, the present invention includes a concrete trowel that 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 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 about a rotational axis that is coaxial with the drive axis, a post extending from the frame, a pair of handlebars coupled to the post for controlling the trowel, an operator control unit mounted on one of the handlebars, wherein the operator control unit includes an ON/OFF switch and a speed adjustment switch, and a blade pitch adjustment knob mounted on one of the handlebars wherein the blade pitch adjustment knob is rotatable to selectively change a pitch of the plurality of blades on the rotor relative to the work surface.
Other features and aspects of the invention will become apparent by consideration of the following detailed description and accompanying drawings.
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
In other embodiments of the concrete trowel 10, the motor 30 can be configured as a brushed motor, or any other type of electric motor known to someone having ordinary skill in the art.
With reference to
In other embodiments of the drive assembly 26, the output shaft 32 can transfer torque to the rotor 18 in order to rotate the blades 22 about the rotational axis via a continuous drive member, such as a V-belt, synchronous belt, chain, etc.
With reference to
While the battery pack 46 is shown supported on the frame 12 in
Since the trowel 10 is configured as a battery powered system utilizing the battery pack 46 to electrically power the electric motor 30, this allows the trowel 10 to operate in enclosed spaces and in environments that have sensitive dust and noise requirements where gas-powered trowels would not have been previously allowed to operate. Additionally, by eliminating a gas-powered engine, costly maintenance is eliminated, and the operator isn't exposes to carbon monoxide exhausted by the engine. Furthermore, a battery powered system simplifies operation of the trowel 10 by eliminating the need for a power cord that would have otherwise require an additional operator to guide during use and produce an unwanted tripping hazard. Also, because there is no power cord, a separate generator for producing electrical power to power the trowel 10 isn't required on the jobsite, which saves both time and money.
Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of one or more independent aspects of the invention as described.
Various features of the invention are set forth in the following claims.
This application claims priority to co-pending U.S. Provisional Patent Application No. 63/153,057 filed on Feb. 24, 2021, the entire content of which is incorporated herein by reference.
Number | Date | Country | |
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Parent | 63153057 | Feb 2021 | US |
Child | 17679360 | US |