Pipe joints or couplings – Repair
Patent
1997-07-11
1998-06-23
Nicholson, Eric K.
Pipe joints or couplings
Repair
138 97, 285397, 285370, 285373, F16L 55162
Patent
active
057694591
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an inside sealing sleeve for insertion in pipes for the purpose of sealing leakage points, comprising an expandable band made from sheet steel bent together in the shape of a ring whose band ends overlap in the circumferential direction, having at least one arresting arrangement in the form of a slot arranged on the internal band end in the circumferential direction, with the one longitudinal edge of the slot supporting a row of teeth, and having a tensioning pinion which is rotatably seated on the external band end, which tensioning pinion engages the row of teeth, and having a detent element which is under the action of a spring element and which engages the toothing of the tensioning pinion.
The invention is applied for the reconstruction of pipelines. With the assistance of inside sealing sleeves, leaky points of underground pipes made from concrete or from another material can be repaired without digging.
It is known to seal leakage points of pipes from the inside of the pipe. This is accomplished with sleeves which are bent together in helical fashion, rubber-coated and provided with special sealing rings and which are made from resilient, corrosion-resistant sheet steel and which are inserted into the pipe to be sealed up to the point of the leakage. There, they are expanded by means of an inflatable air cushion or a mechanical mounting device until they come to rest very closely against the inner pipe wall while the sealing rings are being pressed together. An arresting arrangement comprising a pinion meshing with a row of teeth and a resilient locking bolt engaging the teeth of the pinion holds the sealing sleeve in its expanded position. Here, the disadvantage, however, is that, due to the predetermined pinion toothing, the achievable detent steps of the pinion are so large that--once the sleeve has been expanded up to the limit load--the circumference of the sleeve is inevitably reduced again by up to a whole detent step, thus calling into question the desired sealing and the pressing together of the seals for lack of tight pressing contact against the inner pipe wall (DE 44 01 318 A1, DE 93 18 409 U1).
It is the object of the invention to design an inside sealing sleeve comprising an arresting arrangement which allows very small detent steps and which, once the expansion has taken place, thus ensures a tight, lasting contact against the inner pipe wall while there is a high pressing action on the sealing members.
To accomplish this object, an inside sealing sleeve of the design described at the outset is used as a basis, and the object is solved by the characterizing features of patent claim 1.
With the assistance of the locking pinion, which is under the action of the tensioning spring and acts as a bolt, it is accomplished that, once the expansion has taken place, the tension of the inside sealing sleeve remains almost totally intact after the locking bolt has locked in the tensioning pinion, which is the precondition for excellent sealing of the leakage point.
Advantageous features of the subject matter of the invention ensue from the dependent claims 2 to 5.
The invention is explained below in greater detail by way of the attached drawing sheets. These show:
FIG. 1 a partial view of an inside sealing sleeve, shown in perspective;
FIG. 2 a section of the sealing sleeve according to FIG. 1 with the arresting arrangement, in a plan view as indicated in FIG. 1, in an enlarged scale.
The illustrated inside sealing sleeve 1 intended for insertion in pipes for the sealing of leakage points is made of a resilient material, preferably a sheet metal piece made from stainless steel, and it has the shape of a band of smaller or greater width bent together in the manner of a ring whose external band end 3 overlaps the internal band end 2 over a large section in the circumferential direction. This sealing sleeve 1 can be expanded at the leakage point by suitable apparatuses so that it rests tightly against the inside of the pipe that is to be sealed.
Advisably, the inside sealing
REFERENCES:
patent: 3960395 (1976-06-01), Cirule et al.
patent: 4647072 (1987-03-01), Westman
patent: 5465758 (1995-11-01), Graf et al.
patent: 5507500 (1996-04-01), Skinner et al.
patent: 5549334 (1996-08-01), Zeisler et al.
Graf Eckhard
Graf Juergen
Nicholson Eric K.
Uhrig Kanaltechnik GmbH
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