US 3714743 A
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1973: R. B. HALL 3,714,743
I SQUARE EDGE SANDING TOOL Filed Nov. 11. 1971 IN VENTOR.
3 RONALD B. HALL United States Patent 3,714,743 SQUARE EDGE SANDING TOOL Ronald B. Hall, P.O. Box 365, Alliance, Ohio 44601 Filed Nov. 11, 1971, Ser. No. 197,706
Int. Cl. B2411 15/02 U.S. Cl. 51392 6 Claims ABSTRACT OF THE DISCLOSURE A sanding tool for smoothing one surface of a board or similar article at right angles to an adjoining surface. The tool has a block and abrasive paper or cloth is held taut over a fiat surface on one side of the block, and a handle extends angularly from the other side. Rollers journaled on the block extend at right angles from the fiat surface for bearing on the adjoining surface of the article being sanded.
BACKGROUND OF THE INVENTION In sanding a board or block of wood or the like, to finish one surface at right angles to an adjoining surface, it is extremely difficult to hold the sanding cloth so as to smooth the surface or edge to be square with the adjoining surface, even though the sanding cloth is wrappe around a block.
The most pertinent prior construction of which I am aware is shown in U.S. Pat. No. 2,373,829 which discloses a device for holding a file in various angles of adjustment for beveling the edge of an article, with guide rollers for contacting an adjoining surface of the article. This device does not contemplate a block for holding sanding cloth over a flat surface and does not show a block with a flat surface at right angles to the guide rollers. Furthermore, the handle shown extends outwardly from the guide rollers, requiring the operator to pull the file inwardly against the edge being beveled and at the same time hold the rollers against the guiding surface, which is an awkward and ineffective operation.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple and improved sanding tool which provides for smoothing a square edge on a board or like article.
Another object is to provide an improved sanding tool having means for clamping an abrasive strip across a flat surface with guide rollers contacting an adjoining surface at right angles thereto.
A further object is to provide an improved sanding tool having a fiat sanding surface with guide rollers at right angles thereto, and a handle extending angularly outward from the apex of the angle between the sanding surface and rollers whereby the operator simultaneously presses the sanding surface against the edge being sanded and the guide rollers against the guiding surface at right angles thereto.
These and other objects are accomplished by the improvements comprising the present invention, a preferred embodiment of which is shown in the accompanying drawings and described in detail in the specification herein. Various modifications and changes in details of construction are comprehended within the scope of the appended claims.
3,714,743 Patented Feb. 6, 1973 DESCRIPTION OF THE DRAWINGS DESCRIPTION OF A PREFERRED EMBODIMENT The improved sanding tool includes a block 10 having a Work surface 11 on one side over which a strip of abrasive paper or cloth 12 is stretched taut to present a flat sanding surface. Preferably, the strip 12 is wrapped laterally over the ends and top of the block 10.
An L-shaped clamping plate, indicated generally at 13, fits against the opposite side and one edge of the block 10, and is secured to the opposite side 14 of the block by screws 15, thereby clamping the portions 16 of the abrasive strip between the portion 17 of the plate and the side 14 of the block, while the angular portion 18 of the plate bears against the edge of the 'block 10. A handle 20, preferably U-shaped, extends angularly outward from the corner 21 of the plate 13 between the portions 17 and 18 thereof. Preferably, the angle between the plate portion 17 and the handle is approximately 30.
The block and plate may be made of metal or molded from suitable plastic material. As indicated in FIG. 1, the block may have recesses 22 in its side adjacent to clamp ing plate 13, for the purpose of reducing weight and material.
Two longitudinally spaced guide rollers 24 are mounted on the block 10 and extend at right angles from the surface 11 at the edge thereof opposite to the edge of opposite surface 14, that is, opposite to the edge or corner of the block which is adjacent to the corner 21 of clamping plate 13 from which the angular handle 20 extends.
Preferably, the rollers 24 are journaled on L-shaped rods mounted in block 10. The rods each have one leg 26 received in a transverse bore 27 in the block 10, and another leg 28 extending through a connecting slot 29 in the edge of the block and at right angles to the leg 26 and to the block surface 11 at the edge opposite to corner 21 of the clamping plate. Snap rings 30 are preferably provided to hold the rollers in place upon the legs 28. The clamping plate 13 clamps the two rods in place within the block when the two screws 15 are applied.
In the operation of the improved sanding tool, the abrasive strip abutting surface 11 of the block is held against the edge of a board indicated in phantom at B in FIG. 2, with the guide rollers held in contact with a surface of the board to which the edge is to be formed at right angles. It will be seen that the angle and direction of the handle 20 is such that one holding the handle naturally presses the surface 11 against the edge of the board and simultaneously presses the rollers against the guiding surface of the board while applying a reciprocatory motion to sand the edge of the board and make it square with the guiding surface. Obviously, the work surface 11 may be fiat or contoured to conform to any desired shape.
The improved sanding tool is simple and inexpensive and is easily assembled and disassembled merely by means of two screws. It is easily operated by unskilled persons to insure obtaining a squared edge on a board or similar article.
What is claimed is:
1. A square edge sanding tool having block means with a work surface, means for clamping an abrasive strip in taut condition over said work surface, guide rollers on said block means extending at right angles from one edge of said Work surface, means journaling said rollers on said block means, and a handle on said clamping means extending angularly outward from the edge of said block means opposite to the edge from which the rollers extend.
2. A square edge sanding tool as in claim 1, in which the clamping means comprises a plate engaging the block means opposite to said work surface.
3. A square edge sanding tool as in claim 2, in which the handle is mounted on said plate.
4. A square edge sanding tool as in claim 1, in which the rollers are journaled on rods mounted in said block means.
5. A square edge sanding tool as in claim 2, in which the rollers are held in place by said clamping plate.
6. A square edge sanding tool as in claim 2, in which the rollers are journaled on rods mounted in the block means and the rods are held in place by the clamping plate.
References Cited UNITED STATES PATENTS 2,373,829 4/1945 Hicks 5l205 WG X 1,664,950 4/1928 Sloan 51-392 X 2,489,005 11/1949 Bourdunis 51-392 X 3,432,975 3/1969 Parker 51392 DONALD G. KELLY, Primary Examiner U.S. Cl. X.R. 51-205 WG