Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1989-12-13
1991-10-15
Parker, Roscoe V.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
512415, 1510405, 1510431, 409139, 409143, 166 557, B24B 540, E21B 2900
Patent
active
050562690
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for working in pipes. For example, the present invention relates to an apparatus for scouring water and sewage mains and the like. More specifically, the invention relates to an apparatus which while moving through piping can grind off deposits, inwardly projecting roots and connecting pipes, displaced pipe ends and the like, as well as cut up such piping.
In recent years it has become more usual to fit liners or insert pipes in leaking or other wise deficient piping, instead of exchanging the piping. These liners usually consist of relatively short pipe lengths, which are pushed and/or pulled into the existing piping, where they are jointed into complete lengths which form a tight, functioning pipe line.
There may also be occasions when it is desired to pull out or otherwise remove piping, irrespective of whether it is liner piping or other types of piping. For such removal to be possible, it is suitable to cut such piping into shorter lengths which are then easier to remove.
When existing piping is to be provided with liners, there must be no obstacles such as ingrown roots, solidified deposits, inwardly projecting connection pipes and the like, and over the entire length of the piping which is to be provided with liners there must be nothing impeding their insertion. Neither can there by any abrupt curves or displaced pipe joints which give inwardly projecting edges and abrupt angular changes.
In order that the piping including its lining shall have a through flow capacity which is not notably less than that for the original piping, the liners must have a diameter which is as near to that of the original piping as possible, and they must have the least possible wall thickness. This means that the liners will have an outside diameter very close to the inside diameter of the, original piping. It is therefore a requirement that in order for the liners to be inserted in the piping, the latter must be well scoured and prepared with respect to roundness and freedom from obstacles.
An example of such lining technique is described in the Swedish patent application 8505685-1.
The invention will be described hereinafter primarily with respect to sewage piping. However, as already mentioned, it is utilizable in connection with many different types of piping system, as one skilled in the art will understand, and the description is in no way restricting for the invention. Accordingly, the inventive apparatus can be used for scouring piping which has begun to be blocked up by deposits and therefor has deteriorated through flow capacity, for preparing piping, for fitting lines, and for cutting up piping.
The section of a piping system to which liners are to be fitted is first treated conventionally by closing it off and flushing it. After this it is inspected with the aid of TV equipment, and by the ocular inspection thus enabled it can be decided whether it is at all possible to use liners in the section in question. If there are only obstacles such as inwardly projecting connecting pipes and roots, deposits and the like, which is most usual, these can easily be removed with the aid of the inventive apparatus, since it is an easy operation to grind off the edges of displaced pipe joints and , straighten out abrupt curves and the like with this equipment. Particularly inwardly projecting connecting pipes and displaced pipe joints have previously been obstacles which have been so difficult to remove that it has not been possible to use liners.
Of course, different tools for removing obstacles of the kind mentioned have been constructed per se, both of the water jet and rotating type, but no such tool has been found sufficiently usable for being put to work to any large extent. The problem is not only that these tools must cut off or cut away certain obstacles in the piping, but this must also be done with a certain amount of precision. In addition, the operation must take place so that no new edges or abrupt curves occur, which cannot be passed by the liners. The tool shoul
REFERENCES:
patent: 4601133 (1986-07-01), Gebald et al.
patent: 4648454 (1987-03-01), Yarnell
patent: 4674914 (1987-06-01), Wayman et al.
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