Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1991-10-28
1993-05-04
Parker, Roscoe V.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
51241S, 51170R, 1510409, 409143, 30379, B24B 540, E21B 2900
Patent
active
052070310
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus for use in renovating tube systems, and, in particular, sewer tube systems.
BACKGROUND OF THE INVENTION
In the renovation of sewer tube systems it was previously necessary to exchange damaged sewer tubes with entirely new sewer tubes, which encompassed major costs and possibly troublesome digging work which additionally disturbs the surroundings. Today a newer method of renovation is applied more and more, provided that damaged sewer tubes have the required capacity, wherein the existing sewer tubes are provided in situ with a tube lining comprising a plastics lining which is, for example, formed from a plastics strip which is wound up and assembled inside the sewer tube by special methods and apparatus. It should be remarked that a plurality of accepted methods are known for renovating sewer tube systems by means of an inner lining.
A mandatory prerequisite for applying the new renovation method as mentioned is, at least if sewer systems are concerned which do not allow personal access, the development of small mobile TV cameras such that one may part inspect, prepare and measure up the existing sewer system precisely and part reestablish the positions, precisely as well, at which side openings must be formed again in the plastics lining.
More specifically the invention relates to an apparatus which is primarily developed for use in renovation of sewer tubes, for example, according to the method as mentioned above wherein a plastics liner is formed by winding up inside an existing sewer tube. Admittedly, apparatus are known which are meant to serve the same purpose; but to some extent these known apparatus are very clumsy and complicated in their construction and, consequently, they are rather costly. Furthermore the known apparatus for the purpose mentioned are so large that in practice they can only be used in relatively large sewer tubes.
EP-A-0 084 427 discloses an apparatus for use in renovating sewer tubes and comprising a cylindrical apparatus body adapted to be moved inside a tube in such a way that the position of the apparatus in the tube is known, and a motor-driven tool wherein the motor-driven tool is mounted on a carrier member which protrudes from an end portion of the apparatus body and is journaled so as to be rotatable with respect to the apparatus body around a longitudinal axis. Opposite the apparatus body, the carrier member comprises a lifting mechanism which is interposed between a free end of the carrier member and the tool in such a way that the tool on the latter can be moved diametrally within the tube. Furthermore this known apparatus comprises a turning motor which is interposed between the apparatus body and the rotatable carrier member.
SUMMARY OF THE INVENTION
It is a purpose of the invention to provide an apparatus of the initially mentioned type and which, despite of the fact that it utilizes simple means and a simple and economical construction, may lead to an improved precision and efficiency, for example, in the method of renovation.
The apparatus according to the invention is distinctive in that the carrier member includes a carrier arm made of springy material, for example, spring steel, and is pivotably connected, opposite the tool, to the rotatable portion at a distance from the end part thereof, and that the lifting member is interposed between the end part of the rotatable portion and the pivot axis of the carrier arm, with the pivot axis being perpendicular to the longitudinal rotation axis of the rotatable portion. Thus, an efficient and easily operated apparatus is attained by simple means, which can be used in a safe and precise way, utilizing the tool, for working in principle on any part of the wall of a sewer tube or a tube lining, depending on the type of tool which is arranged at the extreme end of the carrier arm. The latter can itself be moved diametrically within the tube but, as the carrier arm is furthermore arranged to extend from the portion which with respect in relation
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patent: 5056269 (1991-10-01), Westman
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