Stone working – Sawing
Reexamination Certificate
1998-10-15
2001-01-09
Eley, Timothy V. (Department: 3723)
Stone working
Sawing
C125S016030, C125S001000, C125S038000, C083S034000, C083S039000, C083S049000
Reexamination Certificate
active
06170478
ABSTRACT:
BACKGROUND OF THE INVENTION
The field of the invention is concrete cutting and the invention relates more particularly to the cutting of a chamfer adjacent a 90° cut made through a reinforced concrete wall. Such 90° cuts are typically made by utilizing a wall saw mounted on a trolley. The trolley rides along a track which typically includes a rack and the trolley typically includes a gear which meshes with the rack and moves the saw slowly along the wall forming a 90° cut. One such saw assembly is shown in U.S. Pat. No. 3,763,845. Another concrete cutting saw referred to as a “wall saw” is shown in U.S. Pat. No. 5,588,418.
Stonecutting saws have been known for many years and a stonecutting saw which includes two separate saw blades is shown in U.S. Pat. No. 896,702. A stonecutting saw, including a 45° saw, is shown in U.S. Pat. No. 2,187,299. These two saws work simultaneously and the monument is mounted in such a way that the saw must travel past the end of the monument before the second saw finishes its cut.
Typically, the prior art has been concerned with the forming of the 90° cut through the wall. After a 90° cut has been made, it is architecturally important that the new opening have the same edges, or edges which are aesthetically related to the edges which are already formed in other openings in the concrete wall. It is well known that in order to form an opening in a concrete tip-up wall, it is beneficial to chamfer the opening so that when the wall is removed from the form from which it is cast, there is no cracking or removal of concrete at the opening. The chamfer solves this problem. However, the concrete wall-cutting saws leave a sharp 90° cut. Typically, a chamfer is formed by grinding along the sharp edge. Such grinding is time consuming, messy and provides a cut which is not a perfect 45° angle. Another approach is to use a Skillsaw type of saw, hand held, and the blade is tilted at a 45° angle. Once again, the cut is not perfectly straight because of the hand held nature of the saw and it is also a slow time consuming and messy process.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a process and apparatus for forming a smooth 45° cut in a concrete wall into which a 90° cut has already been made.
The present invention is for a process for cutting a chamfer along an edge of a cut formed at 90° from a concrete wall surface using a wall saw assembly. The wall saw assembly is of the type which has a track affixed to the concrete wall surface to be cut. The track guides a trolley which supports a saw frame which holds a concrete saw motor and a 90° blade. The saw frame also holds a driven gear which meshes with a rack held by the track to move the trolley along the track in a slow desired speed. First, the 90° cut is formed. Next, the 90° blade is lifted so it is above the wall surface. Next, a chamfer saw assembly is affixed to the frame between the 90° blade and the wall. The chamfer saw assembly includes a chamfer frame, a chamfer saw motor and a chamfer saw blade positioned at a 45° angle with respect to the 90° blade. The chamfer saw blade is positioned above the outer surface of the wall. Next, the chamfer saw motor is turned on to rotate the chamfer saw blade which is then moved into the concrete to form a 45° cut. Next, the trolley is slowly moved along its former path and the chamfer is neatly and accurately formed along the edge of the previously cut 90° kerf.
The apparatus of the present invention includes a trolley riding a track attached to a concrete wall. A trolley frame supports a motor which is adjustably moveable with respect to the trolley frame, which motor supports a 90° saw blade lifted from a cutting position to a lifted position. When the 90° saw blade is in cutting position, it cuts a 90° kerf in a concrete wall. A chamfer saw frame is affixed to the trolley frame after the 90° saw blade has been lifted. The chamfer saw motor is mounted at a 45° angle with respect to the 90° saw and the chamfer saw motor is moveable from a retracted position to a cutting position. The chamfer saw frame is mounted so that it is directly in the position which the 90° saw occupies when the 90° saw blade is in its cutting position. A chamfer saw is mounted on a shaft of the chamfer motor and when the chamfer saw motor is moved into a cutting position, the chamfer saw will cut a chamfer at a 45° angle with respect to the kerf, thereby forming a smooth chamfer.
REFERENCES:
patent: 4962967 (1990-10-01), Hinkle
patent: 5645040 (1997-07-01), Bieri Jun.
patent: 5724956 (1998-03-01), Ketterhagen
Averill, Jr. Edgar W.
Berry Jr. Willie
Eley Timothy V.
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