Pipe joints or couplings – Packed – Sleeve
Patent
1997-03-05
2000-06-13
Nicholson, Eric K.
Pipe joints or couplings
Packed
Sleeve
24279, 285233, 285410, F16L 1700, F16L 2300
Patent
active
060739770
DESCRIPTION:
BRIEF SUMMARY
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
BACKGROUND OF THE INVENTION
The present invention relates generally to a device for coupling pipe sections whose one end has an outwardly directed bead or a plurality of projections positioned along the circumference. The invention is particularly directed to a device with a clamping band of the type which preferably is used for the coupling of pipes of thin metal sheet, of which the front ends have flanges or outwardly directed beads, such as spiral-fold ventilating pipes and grain conveying pipes, or for the clamping of, for instance, end covers on electric motors or the like. Pipe sections, to which the invention is applicable, are shown in, for instance, Danish Design Registration MR 0508/89.
Prior-art clamping bands of this type are usually fitted with a clamping device, which can consist of, for instance, a handle with a wire or leaf spring (snap lock), the handle and the spring being directly integrated with the clamping band by bending or like operation, or attached by means of mountings which are mounted on the band by riveting or welding.
There are also prior-art clamping bands whose ends are bent perpendicularly away from the band and formed with through holes, the band being clamped by a screw being passed through the outwardly bent ends and a preferably square nut being put on the screw, whereupon the screw and the nut are clamped, thereby moving the ends of the clamping band together.
These prior-art devices are, however, provided with rather complicated clamping mechanisms. Usually, the abutment means cooperating with the straining screw are specially designed and positioned in specially constructed spaces or pockets which are defined by flanges of the clamping band. For instance, the pockets may be formed by the two end portions of the clamping band being rearwardly bent and riveted, soldered or welded to the outer circumference of the clamping band. This makes the construction of the clamping device expensive.
Therefore, the object of the invention is to provide a simple and inexpensive coupling device which eliminates the drawbacks inherent in prior-art clamping bands. Moreover, the invention aims at providing a coupling device having a good sealing effect.
BRIEF SUMMARY OF THE INVENTION
According to the invention, these and other objects, which will appear from the description below, are now achieved by means of a device for coupling first and second pipe sections each having an outwardly directed bead at a respective end thereof, said device comprising: an annular clamping band with two opposite, spaced-apart ends, at which a clamping mechanism is arranged for tightening the band around the end beads of the pipe sections; the clamping band being of substantially U-shaped cross-section with two flanges for safely encompassing the end beads; each end of the clamping band forming a pocket with circular-cylindrical cross-section; said clamping mechanism comprising first and second cylinder elements which are each arranged in a separate pocket and have a circular-cylindrical cross-section, the greatest cross-sectional dimension of said cylinder elements being slightly smaller than the smallest internal cross-sectional dimension of said pocket; and a straining screw for connecting said cylinder elements; the first cylinder element having a transverse threaded hole, whereas the second cylinder element has a transverse unthreaded hole; said straining screw extending freely through the unthreaded hole, through unthreaded holes in the opposite ends of the clamping band and finally being in threaded engagement with the threaded hole; characterized in that the first and second cylinder elements are arranged freely rotatable about their own axis inside the respective pocket; and that the clamping band on its inside facing the end beads of the pipe sections has a circumferential seal for abutment against the end beads.
Owing to the cylindrically designed pockets at the ends of the clamping band and the cylindrical
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R3., Pioneer in METU duct Manufacture System, Circular Duct Flanges LF & SR .
Andresen Werner J.
Schmidt-Hansen Hans
Lindab AB
Nicholson Eric K.
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