Stone working – Sawing – Rotary
Patent
1987-08-14
1989-09-26
Olszewski, Robert P.
Stone working
Sawing
Rotary
299 39, B28D 104
Patent
active
048692271
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a process and a device for producing deep cuts in concrete or similar material.
The British Patent PS 254 282 describes a method of cutting concrete, steel reinforced concrete or brickwork with the aid of circular saw blades. For this purpose the circular saw blades are fitted with diamond tips. However, such cuts are limited in their depth by the fact that only half the saw blade diameter can be used. For deeper cuts a perforation process exists in which one hole after another is drilled in a row which then produces cut-outs. However, such processes are relatively complex.
The invention is based upon the task of making it possible to use circular saw blades for providing deep cuts in concrete or similar materials.
This task is solved by the invention stated in the main claim. Further designs of the invention are described in the subordinate claims.
On principle a guide hole is initially produced next to the proposed cutting position of the circular saw blade. Then a guide which is connected to the drive of the circular saw blade is inserted into this guide hole. The rotating saw blade penetrates to a deeper level as the drive section is pushed further into the hole and is therefore lowered as required to obtain the desired depth of the cut. The guide and the drive sections are mounted on a guide column so that they can move in the direction of penetration by the saw blade. The guide column is stiff enough to prevent the saw blade from being damaged during the cutting operation.
Two design examples are used to explain the invention in more detail with the aid of the drawings. These drawings show:
FIG. 1: A side view of a drill stand serving as a guide column with a holder for the drive and guide.
FIG. 2: A top view of the configuration according to FIG. 1.
FIG. 3: A perspective view of the saw body and guides according to FIGS. 1 and 2.
FIG. 4: A drill stand having a crossbeam secured on both sides.
FIG. 1 shows a device for the production of deep cuts with a circular saw blade. A column (1) in the form of a square steel guide rod is combined with a feed unit (2) to form an adjustable unit which can move along a drill stand (3). A saw (4) which includes both the drive stand (3). A saw (4), which includes both the drive device for a saw blade (5) as well as a guide (4a) for controlling the sawing position in a guide hole (B), is connected to the square guide rod (1) as may be seen from FIG. 2, the saw blade is of a diameter to extend both above and below the saw unit 4. Since the guide (4a) is mainly only required in the first phase of the cutting operation it is removably connected to the saw body of unit 4. In particular with very deep cuts a guide hole (B) can be used which is shorter than a dimension of the radius depth of the cut by the radius of the saw blade (5). The guide (4a) is removed after first phase for cuts. The saw (4) includes guide sections (8) which allow the saw (4) to be held at three points against the wall of the guide hole (B). The square guide rod (1) is movably secured in a mounting (6). This makes it possible to use a square guide rod (1) with a length corresponding to the cutting depth and a relatively short drilling stand. After the cutting depth corresponding to the length of the drilling stand (3) has been reached the square guide rod (1) is moved relative to the mounting (6), the feed unit (2) is moved back to its highest position, the guide rod (1) is re-secured and the cutting process is then continued. A rack (9) on the drill stand (3) guarantees accurate and fine adjustment of the feed unit (2). A blade guard (7) protects both the operator against injury as well as the saw blade against external damage. The saw blade guard (7) can also be designed to collect the cooling and/or flushing water. As indicated in FIG. 1 the cooling water is fed through a pipe (10) at the upper end of the square guide rod (1) and is sprayed against both sides of the saw blade (5). The water then flows through the sawn slot and is collected by the blade guard (7). The wat
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Desai Shirish
Olszewski Robert P.
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