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US 4,789,046 AGranted
Cement finisher's knee board
AssigneePro Board, Inc.
InventorNeil A. McDowall
Life of this patent
Estimating the term…
Abstract
A rigid light weight knee board for cement finishers. The body of the knee board comprises a high density extruded closed cell polystyrene foam. A water repellent cover made from soft pliable vinyl is provided for the board and includes an upright handle strap.
Claims10
A cement finisher's knee board comprising;
- a rigid high density body member comprising extruded closed cell polystyrene foam having a thickness of from 1-2 inches and a weight of from 2-3 pounds per cubic foot,
- said body member having at least one flat surface adapted to be supported from a wet cement surface and the opposite surface thereof adapted to accommodate a kneeling workman, said surfaces being visco-elastic and having a vertical compression load capacity of from 25-45 psi, and
- a soft pliable water repellant cover layer surrounding said foam body member.
A cement finisher's knee board comprising;
- a rigid body member comprised of high density polystyrene foam weighing 2-3 pounds per cubic foot and having a thickness of 11/2 to 2 inches,
- said body member including first and second opposed flat surfaces adapted to be supported from a wet cement surface and to accommodate a kneeling workman respectively;
- said surfaes being visco-elastic and having a vertical compression load capacity of 25-45 psi, and
- a soft pliable water repellant cover surrounding said foam body.
1 more element
A cement finisher's knee board for supporting a person in a kneeling position on a wet uncured cement surface comprising;
- a rigid expanded foam body having flat top and bottom surfaces of sufficient dimensions to accommodate both knees and both toes of a person in a kneeling position,
- a soft pliable water repellant cover layer surrounding said foam body, and
- carrying strap means connected to said cover,
- said foam body being comprised of extruded high density closed cell plastic foam, being approximately 1-2 inches in thickness and having a weight of 2-3 pounds per cubic foot, said foam body being visco-elastic and having a vertical compression load capacity of 25-45 psi,
- whereby cushioning is provided for the knees of the person while the body weight of the person is distributed over the area covered by the knee board with no substantial deflection of the board body.
2 more elements
Dependencies are inferred from the claim text.