Patent Application
20230019419
The present invention is broadly concerned with concrete finishing tools and, more particularly, to such tools, particularly concrete float tools, having grooves on working surfaces thereof.
When concrete is used to form a relatively horizontal structure, such as a floor of a building, a walkway, a section of a road, or the like, the concrete slab is finished by first using a screed to strike off the poured concrete to a predetermined elevation, angle, and flatness. Once the concrete has been screeded to elevation, a float tool is used to work the fine aggregate (fines), also known as “cream” or “paste”, to the surface above coarser aggregates. Floating also causes “bleed” water to rise to the surface where it can be allowed to evaporate.
So-called “bull” floats have long handles and are pushed or pulled across large areas of concrete. They are typically about 8 inches in width and may be 3 to 10 feet in length. Hand floats, also known as “darbies”, range in widths from 3 to 5 inches and in lengths from 12 to 24 inches. Bull float are used for large areas while hand floats are used for smaller areas or for areas with existing structures which prevent bull floats from being used. Float tools may be made from metals, such as aluminum or magnesium, woods, and polymer materials, depending on the character of the concrete surface to be formed.
The present invention provides embodiments of improved concrete finishing tools with grooves in working surfaces thereof for floating a surface of a slab of poured concrete.
An embodiment of the concrete finishing tool or float includes an elongated concrete finishing plate having a first concrete finishing surface to engage concrete and an opposite second surface, the plate having opposite elongated lateral sides and opposite ends, a handle member secured to the plate on the second surface to enable manipulation of the plate, and a plurality of elongated, fine grooves formed along the first surface of the plate between the ends thereof, the grooves enhancing manipulation of components of poured concrete on which the assembly is used.
In certain embodiments the grooves are curved and radially spaced from adjacent grooves and are curved with a preferred radius of about 26 inches (66 cm) plus or minus about 25 percent. The grooves may be formed in radially spaced patterns which are repeated between the lateral sides of the plate and in varying depths. Each groove preferably has a depth less than about 0.5 mm (0.02 inch) and a similar range of widths. The grooves may have a spacing between adjacent grooves ranging from about 2 mm (0.079 inch) to about 0.02 mm (0.00079 inch).
The handle member may be removably secured to the finishing plate. The plate may have a plurality of the grooves formed on the second surface of the finishing plate and be reversible to position the second surface to enable finishing engagement of the second surface with concrete. The finishing plate is preferably formed of a polymer, especially an ultra high molecular weight polyethylene polymer.
Various objects and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention.
The drawings constitute a part of this specification, include exemplary embodiments of the present invention, and illustrate various objects and features thereof.
As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure.
Referring to the drawings in more detail, the reference number 1 generally designates an embodiment of a concrete float assembly having grooves 2 on a working or finishing surface 3 of a finishing plate 4 of the assembly 1 of the present invention. The assembly 1 is generally used in concrete finishing operations to bring fine aggregates 7, including mainly cement and sand, of a freshly poured concrete slab 9 above coarser aggregates 11, such as gravel and the like. It is foreseen that the float, may be used with various materials related to concrete during finishing operations thereof.
Referring to
The illustrated float assembly 1 is sized and configured as a hand float which is typically utilized by one hand of a concrete finisher and applied to the surface of the slab 9 using side-to-side sweeping motions. As such, the illustrated handle 14 is suitable for a hand float. The handle 14 may include grip features 29 (
The finishing plate 4 may be formed of a suitable material such as a wooden material (not shown), a metal material such as aluminum or magnesium, or a polymer, such as an ultra high molecular weight polyethylene polymer or UHMWPE. Such an UHMWPE polymer is highly resistant to corrosive chemicals, has extremely low moisture absorption and a very low coefficient of friction, is self-lubricating, and is highly resistant to abrasion.
The illustrated finishing plate 4 has an upper or top surface 32 and a lower or bottom surface 34. Typically, the bottom surface 34 forms the finishing surface 3 of the plate 4 and has the grooves 2 formed thereon. It is also foreseen that the grooves 2 could be formed on the top surface 32, and the finishing plate 4 could be made conveniently removable from the handle 14 and mounting strip 18. By this means, the finishing plate 4 could be reversed to extend the useful life of the finishing plate 4 should the grooves 2 of finishing surface 3 become worn from use.
As illustrated in
The grooves 2 are preferably substantially parallel and may be straight or preferably, as illustrated, curved. Embodiments of the float assembly 1 may have grooves 2 with radii of about 26 inches (about 66 cm), plus or minus about 25 percent. Individual grooves 2 may have widths and depths roughly similar to the width and depth of human fingerprints and typically less than about 0.5 mm (about 0.02 inch). Embodiments of the float assembly 1 may have grooves 2 spaced apart distances ranging from about 2 mm (0.079 inch) to about 0.02 mm (0.00079 inch). The patterns 38 may repeat at about 0.875 inch (about 22 mm) plus or minus about 25 percent. It is foreseen that grooves 2 with greater or lesser dimensions and spacings could be beneficially employed in the float assembly 1. In the illustrated embodiment the grooves 2 are shown in patterns of a deeper groove 43 followed by six or seven grooves 44 that are about half as shallow as each deeper grove 43.
It is to be understood that while certain forms of the present invention have been illustrated and described herein, it is not to be limited to the specific forms or arrangement of parts described and shown.
