Pipe joints or couplings – Deformed – Outwardly expanded
Patent
1996-11-04
1998-04-14
Arola, Dave W.
Pipe joints or couplings
Deformed
Outwardly expanded
285423, 285921, 2853822, F16L 1314
Patent
active
057383880
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for permanent joining of tubes made of a flexible material, such as polyethylene, and specially intended for use as covering or lining tubes when drilling holes in the ground, particularly soil or moraine, which device includes a female portion on a first tube and a male portion interacting therewith on a second tube, the male portion being provided with an annular projection round its outer circumference, which under radial deformation thereof and/or of an annular projection on the inner circumference of the female portion is arranged to pass this and to be inserted in an annular recess on the inner circumference of the female portion.
PRIOR ART
Devices of the above described kind are previously known but are used for joining of waste pipes. An example of such a device is shown in GB 2 166 826A.
The main disadvantage of said device is that the joined pipes may be turned relative to each other thereby causing leakage. Another disadvantage is that a relatively low force is required to unintentionally break the joint and a relatively high force is required to provide it.
Devices for joining tubes, together forming a cover or a lining, which are driven into the ground during or after making of a hole therein are previously known from, for example, SE 9200563-6.
The main disadvantage of the last-mentioned device is that special joining elements of metal have to be attached to each tube end, making the product more expensive, and that the joining elements are threaded, requiring turning of at least one of the tubes during the joining process.
DESCRIPTION OF THE INVENTION
It is an object of the present invention to eliminate, at least partly, the above stated disadvantages of previously known devices and to provide a device which is uncomplicated, reliable and strong.
This object is achieved in that the device according to the invention presents the features stated in the characterizing portions of the claims.
DESCRIPTION OF THE FIGURES
FIG. 1 is a longitudinal sectional view showing part tube provided with a female portion forming part of the device according to the invention,
FIG. 2 is a longitudinal sectional view showing part of a second tube provided with a male portion forming part of the device according to the invention, and
FIG. 3 is a longitudinal sectional view showing the male and female portions of FIGS. 1 and 2 joined together.
PREFERRED EMBODIMENT
In FIGS. 1 and 2 there is depicted part of a first tube 1 of circular cross section, and part of a second tube 2 of circular cross section, which in FIG. 3 are shown joined together. The tubes are made of plastic material, suitably PEH (high-density polyethylene) which is flexible, at least in the radial direction.
The tube 1 is provided with a female portion 3, which on the inside is provided with 12 radially inwardly directed, annular projections 4a-1, which are equally spaced in the axial direction and which delimit annular recesses 5a-1 therebetween. The projections 4 and the recesses 5 in cross section together form a saw-tooth pattern having essentially axially oriented surfaces forming an angle .alpha. of 5.degree.-15.degree., preferably around 10.degree. with the longitudinal axis of the tube 1, and having essentially radially oriented surfaces forming an angle .beta. of 5.degree.-15.degree., preferably around 10.degree., with an axis perpendicular to the longitudinal axis. The distance between two adjacent projections 4 is around 5 mm and the thickness of material in this area is about equal. The tube 1 has an outer diameter of around 100-300 mm, a thickness of material of around 8-10 mm, and a length of around 3 m.
The projection 41, which is nearest to the right-hand tube end, merges on the right into a conical, outwardly tapering portion 6 which is terminated by an end portion 7 of uniform thickness. The recess 5a farthest away from the right-hand tube end merges on the left into a conical, inwardly thickened portion 8, which merges into a groove 9, which merges into the t
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patent: 5071173 (1991-12-01), Hegler et al.
patent: 5078430 (1992-01-01), Onge
patent: 5261493 (1993-11-01), Brammer
patent: 5360242 (1994-11-01), Argent
patent: 5542483 (1996-08-01), Edman
Arola Dave W.
Atlas Copco Craelius AB
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