Blade for motorized trowel
AssigneeSmith and Kelsay Mfg.
InventorGordon M. Kelsay III
Life of this patent
Estimating the term…
Abstract
A trowel machine has replaceable blades with an improved mounting arrangement. In a preferred embodiment, the blade can be replaced separately from the backing bar, and the same fasteners that secure the blade to the backing bar also secure to the trowel arm of the machine. In a preferred embodiment, the blade is deformed in the area of the mounting holes, providing a good interlocking, clamping surface recessed from the working surface of the blade, so that there is good retention of the blade on the trowel machine, even as the blade wears.
Claims19
A blade for a motorized trowel, comprising:
- a substantially flat sheet of material forming an elongated blade, having a top surface and a bottom surface and defining a plurality of in-line holes spaced at intervals along the length of the blade;
- wherein the sheet is deformed upwardly surrounding the holes to form a tapered depression in the bottom surface surrounding the holes and a tapered projection in the top surface surrounding the holes.
A trowel blade for a motorized trowel, comprising:
- a backing bar, having a substantially flat bottom surface and a substantially flat top surface, and defining a plurality of non-cylindrical openings extending from said bottom surface to said top surface, wherein said bottom surface defines indentations surrounding said openings;
- a trowel blade, defining a plurality of holes aligned with the openings in said backing bar, said trowel blade having a substantially flat top surface and a substantially flat bottom surface;
- and
- a plurality of bolts, each bolt having an enlarged head, a threaded end portion, and a non-cylindrical neck portion between the head and the threaded end, and each bolt extending upwardly from the bottom surface of said trowel blade, through its respective hole in the trowel blade, and through its respective non-cylindrical opening in the backing bar, wherein the non-cylindrical neck portion of the bolt is sized and shaped to prevent rotation of the bolt relative to non-cylindrical opening in the backing bar, and wherein, when the bolt is tightened, the head of the bolt clamps the blade against the backing bar.
A motorized trowel, comprising:
- a rotary drive motor, having an output shaft;
- a plurality of elongated trowel arms projecting radially from said output shaft, each of said trowel arms defining a plurality of holes and defining a top surface and a bottom surface;
- at least one trowel blade, having a substantially flat bottom surface and defining a plurality of holes, said blade being fastened to its respective trowel arm;
- and
- a plurality of bolts fastening said trowel blade to said trowel arm, each of said bolts extending upwardly from the bottom surface of its respective blade, through said trowel blade, through a corresponding hole in said trowel arm, and through a respective nut on the top side of the trowel arm.
Dependencies are inferred from the claim text.