Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Percussive tooth or bit
Patent
1994-01-31
1997-05-27
Bagnell, David J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Percussive tooth or bit
299101, E21B 1036, E01C 2312, B25D 1702
Patent
active
056325274
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a tool for the removal or treatment of high-strength floor or wall surfacing, especially in industrial buildings. It is to be understood that "high strength surfacing" in the context of the invention refers to surfacing such as industrial topping finishes on raw concrete, e.g. wear coverings composed of magnesite, epoxy resin or some other synthetic resin, which are generally very hard and tough.
BACKGROUND OF THE INVENTION
Finishes such as those mentioned above are very difficult to remove in the course of conversion work. A known method is to cut the finishes away with a cutting roller which is fitted with cutting spikes with tungsten carbide tips. According to the above method, it is, for example, possible to achieve a cut groove 400 mm wide and 20 mm deep. However, such cutting rollers require a relatively heavy parent vehicle with a high driving power. With such a machine, it is possible to reach only a part of the floor surfaces in, for example, old buildings with their many nooks and crannies. This is due not only to narrow door openings but also because of the inadequate bearing capacity of intermediate floors. Those parts of the floor surfaces which cannot be reached must then be chipped away manually with an air hammer. Mention should also be made of the extremely large amount of dust which is generated when such cutters are used and this makes expensive suction devices necessary.
The object on which the invention is based is to propose a tool with which it is possible to improve the operations mentioned above in terms of lower costs for the machinery, better maneuvrability in buildings and the generation of less dust while achieving at least the same area coverage. A further object is to specify a tool by means of which relatively thin coatings just a few millimeters in thickness can be removed and surfaces can be merely roughened or precisely levelled.
SUMMARY OF THE INVENTION
The above object is achieved according to the invention by virtue of the fact that a plurality of cutting spikes with sintered-carbide tips as used, for example, on cutting rollers for road surfaces are arranged on a common carrier in strip or plate form which is intended and suitable for transmitting striking and/or vibration forces to the cutting spikes. The fundamental idea thus consists in using known cutting spikes, also often referred to as round-shank chisels, in a way hitherto unknown for such cutting spikes, namely in such a way that one cutting spike or a plurality of cutting spikes rest simultaneously with their tips on the covering to be removed or treated and are subjected to impact and/or vibration loading.
There are various fundamental advantages in comparison with a chiselling tool with a continuous cutting edge or individual tips. In particular, the tool described has a very long service life since the cutting spikes are virtually wear-free. Since the permanently sharp spikes penetrate easily into the material, the blows do not have to be so powerful. Thus, for the same effect on the covering to be removed or treated, smaller percussion or vibrating drives are sufficient and the loading on the intermediate floors is correspondingly lower. Also very important is the fact that steel reinforcements in the covering are not severed, the sintered-carbide tips being deflected by the reinforcement. The often desired partial exposure of reinforcements can thus be achieved rapidly and in a simple manner. The amount of dust generated is fundamentally less.
The cutting spikes are held with play in location holes in the carrier with the aid of clamping sleeves. However, they can also be held in cast-steel location housings which allow play, each of these housings having a location hole and being fixed, welded for example, to the carrier. In this way, it is possible to replace the spikes individually. Moreover, the above arrangement has the advantage that it is optionally possible to use cutting spikes whose sintered carbide tips are matched in terms of their metal
REFERENCES:
patent: 4201421 (1980-05-01), Den Besten et al.
patent: 4342486 (1982-08-01), O'Neill
patent: 4714374 (1987-12-01), Mihara
patent: 4784517 (1988-11-01), Bergqvist
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