Stock material or miscellaneous articles – Structurally defined web or sheet – Including fastener for attaching to external surface
Patent
1996-01-11
1997-08-26
Thomas, Alexander
Stock material or miscellaneous articles
Structurally defined web or sheet
Including fastener for attaching to external surface
428192, 428 60, 428 61, 138122, 138129, 138154, 405146, 405152, 156191, F16L 100
Patent
active
056609124
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to improvements in and to a plastic strip used for producing a helically wound tube or pipe for renovating and/or protecting sewers and pipes. In particular, the invention is concerned with an improved means and method for sealingly joining together the adjacent turns or convolutions of a spirally wound tube or pipe.
BACKGROUND OF THE INVENTION
It is well known that concrete pipes and the like after some years of services can fail due to the corrosive nature of the liquid that flows through them. To fix a protective lining to the bore of such pipes is well proven and one known method is to take a spiral winding machine and spirally wind a plastic profile directly into the bore of the pipe to be relined. In many instances however, where the pipe to be relined is of such a large diameter and of oval configuration, spirally machine wound tubular liners are not convenient and are unsatisfactory in terms of practical efficiency.
The applicant is also aware of a method of renovating and/or protecting sewers and pipes disclosed in Australian Patent Application No 70216/91 dated 4th Feb. 1991 (Danby) wherein an elongate plastic strip is first spirally wound into the sewer or pipe to be relined, following which the adjacent convolutions or windings of the strip are manually aligned so that their marginal joint formations are in abutting relationship, and thereafter a separate elongate joining strip is used to join together the abutting joint formations of the adjacent convolutions of the strip to in turn lock the convolutions of the strip together.
It will be immediately evident that such a method entails the feeding in and handling by the workman located in the pipe, of two separate strips, namely the tube or pipe forming liner strip and the joining strip.
SUMMARY OF THE INVENTION
It is the main object of the present invention to provide an improved plastic profiled strip which will obviate the need for a workman to handle two separate strips when renovating or relining an internal passageway such as a sewer pipe, manhole or tank, and which will simplify the jointing together of the adjacent convolutions of the helically wound strip after having been located in the bore of the passageway being relined.
It is another object of the present invention to provide an improved plastic profiled strip which is particularly suited for relining of sewers and pipes which contain variations in diameter along their lengths.
Other preferred objects will become apparent from the following description.
Accordingly, the present invention is directed to an improved plastic profiled strip for use in forming helically wound tubes or pipes, comprising a series of outwardly extending rib formations spaced apart across the width of the strip on the outer side thereof to thereby form a series of open longitudinally extending side-by-side channels, a male joint formation adjacent one longitudinal edge of said strip and extending therealong and a female joint formation adjacent the other opposite longitudinal edge of the strip and extending therealong, the adjacent male and female joint formations of adjacent windings of the strip being adapted to interlock to thereby lock the adjacent windings of the strip together, characterised in that one of said joint formations is flexibly connected to the strip so as to permit that joint formation to hinge or flex about an axis which extends longitudinally of the strip and which is spaced a short distance inwardly of said one joint formation, arranged and constructed so that said one joint formation is hingedly movable between a disengaged or unlocked position wherein it is displaced from the plane of the strip and a locking or engaged position wherein it interlocks with the other of said joint formations.
Preferably, said one of the interlocking joint formations is the male joint formation and comprises a hinged flap integrally formed with the strip and joined thereto by a hinge section which can be a co-extruded section of soft plastics material
REFERENCES:
patent: 4566496 (1986-01-01), Menzel et al.
patent: 5101863 (1992-04-01), Fuji et al.
Rib Loc Australia Pty Ltd
Thomas Alexander
LandOfFree
Plastic profiled strip forming helically wound tube using hinged does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plastic profiled strip forming helically wound tube using hinged, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plastic profiled strip forming helically wound tube using hinged will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1986956