Stone working – Tools – Impact
Patent
1993-09-17
1997-01-07
Kisliuk, Bruce M.
Stone working
Tools
Impact
30128, B28D 126
Patent
active
055906397
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is based upon a filing in Australia No. PK 1531 of Jul. 25, 1990. This application is a 371 of PCT/AU91/00328 of Jul. 21, 1991.
This disclosure contains no rights to any invention made under Federally sponsored research and development.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and tool for cutting grooves and channels in brickwork, masonary and masonary rendering such as stucco. The tool is a kind of single bevel twin blade chisel for dust-free chasing of brick and masonary material by cutting groves, recesses and penetrations into structures and by removing material by laminar separation. Such chasing is conventional to conceal electric cables and pipework below a structural surface.
2. Description of the Prior Art
Known methods of masonary chasing include both drilling and sawing which both create occupational health hazards from the dust evolved which may be inspired and require protective equipment. Silicosis is a recognized occupational lung disease of brick and stone workers. Although other cutting tools including chisels are known to the masonary prior art, these require a method of multiple cuts in serial operations and may shatter or deface the area near the groove.
Recognized prior patents include: U.S. Pat. No. 2,199,380 of May 7, 1940 by WALRAVEN and U.S. Pat. No. 2,630,627 of Mar. 10, 1953 by BECK for panel cutting tools and French Patent 481,661 of Jan. 17, 1917 by FOUQUET for chisels. None of these patents produces a dust-free groove in a single operation. Other prior art includes EP 131,688.
SUMMARY OF THE INVENTION
The invention discloses an article of manufacture which is a cutting tool comprising at least two coplanar single-beveled cutting edges diverging from a central mounting which include at their V junction a recess at a handle mounting which is made in steel. The tool generates an implosion between twin blades at an operating angle between 5.degree. and 90.degree. to the surface being cut and provides laminar separation of tiles from mortar as well as forming grooves in brick, without generation of dust.
In the method of the invention the divergent single bevel cutting edges are driven forward along a groove in brick (for example) by hammering on the remote handle end. The step of masonary imploding between and ahead of the cutters avoids dust generation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of the masonary cutting tool showing twin forwardly divergent single bevel cutting edges mounted at one end of an elongated steel handle. Where the edges approach each other in a V, a U-shaped recess is formed centrally in the handle;
FIG. 2 is a cross sectional and elevational view of the handle beyond the recess which shows the concave structure of the upper handle which may also be V-cut along the upper surface;
FIG. 3 is a side elevation of the tool showing the flat single-bevel lower surface of cutters as they engage the work, the upward single cutter bevel, and the curved upper radial surface of the cutters as they merge into the handle.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The following statement is a full description of this invention, including the preferred embodiments and the best method of performing it known to the inventor.
The invention is directed to a tool and to a method of dust-free chasing of brick structures. A chisel type tool is specially adapted for cutting groves, recesses and penetrations in masonary, such as brick structures with little or no dust production. Avoidance of dust avoids occupational health hazards.
The invention includes a method of cutting which optimizes the removal of materials by laminar separation.
In the method of the invention the single-bevel chisel tip enters and is driven through masonary by percussion applied to the handle remote from the cutting edge, which causes implosion of debris between the convergent cutting edges at a central venting groove or recess where the blades join the handle. The recess is
REFERENCES:
patent: 2199380 (1940-05-01), Walraven
patent: 2630627 (1953-03-01), Beck
Drucker William A.
Kisliuk Bruce M.
Nguyen George
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