Cordless electrically-powered concrete screed
AssigneeCurb Roller LLC
InventorsKraig Allen Pyle, Seth Nathaniel Ulmer, John Allen Armstrong
Life of this patent
Estimating the term…
Abstract
A power unit is configured for use as part of a concrete screed and includes a frame and a powered drive. The frame includes a drive housing. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum. The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor. The powered drive includes a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum.
Claims16
A power unit for a concrete screed including a rotatable concrete forming drum, said power unit comprising:
- a powered drive configured to rotate the drum,
- said powered drive including an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor,
- said powered drive including a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum;
- a handle to be grasped by a user and including a relatively shiftable drive controller, with the handle being configured to facilitate manual advancement of the concrete screed in a forward direction,
- said powered drive further including a shiftable drive control element operable to control the electric motor and thereby rotation of the drum;
- and
- a linkage operably interposed between the drive controller and the drive control element so that shifting of the drive controller corresponds with shifting of the drive control element,
- said electric motor comprising a continuous variable-speed drive motor operable to drive the drive shaft through a range of rotational speed,
- said drive control element and said drive controller each being variably positionable, with the position of the drive controller and thereby the drive control element corresponding to the rotational speed of the drive shaft.
Dependencies are inferred from the claim text.