Fluid handling – With repair – tapping – assembly – or disassembly means – Tapping a pipe – keg – or apertured tank under pressure
Reexamination Certificate
2000-07-07
2001-07-17
Walton, George L. (Department: 3753)
Fluid handling
With repair, tapping, assembly, or disassembly means
Tapping a pipe, keg, or apertured tank under pressure
C030S093000, C408S137000
Reexamination Certificate
active
06260573
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a pipe-drilling fitting for a medium-conveying pipe, comprising a housing which has a drilling stub, which can be fitted at an angle to the pipe axis, for drilling into the pipe wall, and a branch stub which is arranged at an angle to the drilling stub, a rotationally actuable cutting bush being arranged in the drilling stub, the cutting bush and the drilling stub having mutually complementary screw threads, and at least one sealing means for sealing the medium-conveying pipe with respect to the outside being provided between the drilling stub and the cutting bush.
DE 196 30 029 A1 has disclosed a pipe-drilling fitting in which the cutting sleeve has both a cutting function and a sealing function. The sealing function is provided by elastic sealing rings which are arranged in radial grooves on the outside of the cutting bush, in the region of an external thread, and slide along a complementary internal thread on the drilling stub. The internal thread extends over a length which is longer by a multiple than the thickness of the sealing ring. Over this length, the internal screw thread can easily cut into and damage the elastic sealing ring as the components are repeatedly screwed in and out. The great length also leads to a considerable overall height.
It is an object of the present invention to provide a pipe-drilling fitting which is as simple and compact as possible and exhibits a maximum possible sealing function in all phases of use.
SUMMARY OF THE INVENTION
The foregoing object is achieved by the present invention wherein a pipe-drilling fitting is provided comprising a housing having a drilling stub, fitted at an angle to the pipe, for drilling into the pipe, and a branch stub which is arranged at an angle to the drilling stub, a rotationally actuable cutting bush arranged in the drilling stub, the cutting bush and the drilling stub having mutually complementary screw threads, and at least one sealing means for sealing the medium-conveying pipe with respect to ambient provided between the drilling stub and the cutting bush, wherein the sealing means between the drilling stub and the cutting bush is arranged radially inward of and at an axial distance from the complementary screw threads.
It is advantageous for the pipe-drilling fitting to be able to withstand as high a pressure as possible from the conveyed medium. This is achieved by the fact that the sealing means between the drilling stub and the cutting bush is arranged radially inward of and at a distance from the complementary screw threads. The force which acts on the elastic sealing means increases as the diameter of the sealing means becomes greater.
It is also advantageous for it to be possible to produce the pipe-drilling fitting as simply as possible. This is achieved by the fact that the sealing means between the drilling stub of the housing and the cutting bush is arranged in a uniform sealing region, which is at a distance from the screw thread, of the cutting bush. This is also achieved by the fact that the sealing region is formed on an inner wall of the cutting bush, and that the screw thread is designed as an external thread on an outer wall of the cutting bush. Assigning the functions of cutting, sealing, securing and driving to spatially separate regions ensures that the dimensioning of the cutting bush can be optimally adapted to the corresponding function of the various regions.
Furthermore, it is advantageous for the overall height of the pipe-drilling fitting to be as low as possible. This is achieved by the fact that the drilling stub has an annular holding pocket for holding the sealing region and the threaded region. Despite the addition of the sealing region, the overall height of the pipe-drilling fitting remains the same as or less than that of existing fittings.
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Lehmann Ernesto
Muller Reinhard
Schwarz Bernd
Bachman & LaPointe P.C.
Georg Fischer Wavin AG
Walton George L.
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