Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1985-10-10
1987-08-18
Kittle, John E.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428122, 138122, 138154, F16L 916
Patent
active
046876901
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
It has been proposed heretofore to manufacture strips from extruded plastic which strips have had on them a series of transversely positioned upstanding ribs which form between them longitudinal channels, the strip being formed of indefinite length and having at one edge portion a first interengaging member and at another portion either at the opposite edge or inward from the opposite edge a second interengaging member, the arrangement being such that when such a strip is wound in a helical manner with the first enterengaging member locking into the second interengaging member a tubular object is formed which may be of any selected length and is of considerable strength and has many useful purposes such as the formation of pipes which are to be buried in the ground and which then are protected by the helical ribs around the periphery of the pipe.
This invention envisages certain improvements to helically wound structures of this type.
During research the applicants have found that the shape of the transversely positioned upstanding ribs is of importance for a number of reasons, one being to provide maximum protection of a tube so formed by means of the outwardly projecting ribs, another being to provide cushioning means by a selected shape of the ribs, another being to so shape the ribs that better interlocking between adjacent overlapping margins of the strip can be achieved particularly where a fluid seal is required, and these ribs can also be formed to provide added reinforcing by incorporating or being shaped to incorporate reinforcing members, or can be given advantageous shapes when used as sand screens or the like where particles must be prevented from blocking apertures through the wall of the pipe itself, and the present invention relates to various strip formations which achieve the required strengthening and improvement of the pipes formed from such strips.
OBJECTS OF THE INVENTION
An object of the invention is to provide a better means of interengagement of the overlapping portions of the two edge portions of the strip when wound into helical form to supply a firm join without danger of accidental failure.
A further object of the invention is to provide greater impact resistance in such a structure.
A further object is to provide a tube having high impact resistance but a degree of longitudinal flexibility.
A still further object is to use plastic "Memory" to effect a lock.
A further object is to achieve a firm lock with plastics which cannot be solvent or heat welded.
A still further object is to provide a shape which can conventionally be formed into a sand screen or can be used in trickle irrigation or the like.
A still further object is to form a relatively flat continuous surface at the inside of tubes having ribs shaped to give cavities, or for varying the extension capabilities of the structure formed by the strip.
The first object of the invention is related to the marginal sealing of tubes formed of a strip wound to helical form, the edges of the strip overlapping and provided with interengaging means such as a rib on one end and a socket on the other end to interengage during the winding to form a continuous tube, the invention relating particularly to the form of the join at the overlap.
STATEMENT OF INVENTION
The invention consists in a tube formed by helically winding a strip to have overlapping edge portions between convolutions of the strip, and locking the overlapping portions together by a first interengaging member on one face of the strip engaging a mating second interengaging member on the other face of the strip spaced laterally from the first interengaging member, the strip having a series of spaced upstanding longitudinal ribs on at least one face, characterised by a rib forming the first interengaging member having a bulbous end portion, and by a rib having a bulbous mating hollow intermediate its ends opening through the strip to form a socket like second interengaging member, at least the second interengaging member being resilient to re
REFERENCES:
patent: 2739089 (1956-03-01), Hageltorn
patent: 3199541 (1965-08-01), Richitelli et al.
patent: 3815639 (1974-06-01), Westerbarkey
patent: 4119123 (1978-10-01), Samuels
patent: 4209043 (1980-06-01), Menzel
patent: 4224965 (1980-09-01), Suchor
patent: 4435460 (1984-03-01), Menzel
patent: 4471813 (1984-09-01), Cothran
patent: 4566496 (1986-01-01), Menzel
PCT Publication WO82/01757 to Johns-Manville Corporation.
Kittle John E.
Rib Loc Hong Kong Limited
Seidleck James J.
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