Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1989-05-25
1990-10-16
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156191, 156450, B32B 700, B32B 3100
Patent
active
049632116
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
THIS INVENTION relates to a method of, and machine for, winding tubes from strip.
(2) Prior Art
Australian Patent No. 530,251 and Patent Application No. 15562/83, both in the name of Rib Loc Hong Kong Ltd. disclose machines for producing tubes of helically wound extruded plastic strip having at its side complementary rib and groove formations which, in successive convolutions of the helix, are caused to interlock by a joining roller.
BRIEF DESCRIPTION OF THE INVENTION
The present invention has been devised with the general objects of providing a machine which is particularly efficient in the production of tubes wound from strip, and a method of making such tubes.
Other objects achievable in preferred embodiments of the invention are to provide such a machine which may be quickly and easily modified to produce such tubes of different diameters, which is particularly compact and so well suited for lowering into a manhole for the production of a tube projected as a liner into a sewer, and which, though simple and economical to manufacture, is sturdy and durable in use.
With the foregoing and other objects in view, the invention resides broadly, in one aspect, in a machine for winding tubes from strip including a base; a substantially cylindrical core mounted rotatably on the base and defining the internal diameter of a tube to be formed, means for rotating the core; an annular outer sleeve mounted on the base coaxially about the core and forming an annular space between them; an inlet opening in the sleeve to the annular space; means for guiding a tube forming strip through the inlet opening to the annular space; a series of pressure rollers mounted on the sleeve in a helical path and entering the annular space to urge the strip into frictional engagement with the rotating core and to guide it to form about the core a helix with closely adjacent convolutions; locking means being provided for locking together the said adjacent convolutions.
Preferably the strip is formed with longitudinal side ribs and a series of intermediate ribs between and parallel to them, and the adjacent side ribs of succeeding convolutions are locked together by a longitudinal grooved or recessed locking strip guided through the inlet opening and acted on by the pressure rollers to engage on and lock together the said adjacent side ribs.
Means are preferably provided for introducing glue to the longitudinal groove or recess of the locking strip before its entry to the inlet opening.
The core and the assembly of the outer sleeve and pressure rollers are preferably interchangeable with others for the production of tubes of different diameters.
Other features of the invention will become apparent from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that a preferred embodiment of the invention may be readily understood and carried into practical effect, reference is now made to the accompanying drawings, wherein:
FIG. 1 is a partly broken-away side elevational view of a machine according to the invention;
FIG. 2 is a partly broken-away plan view of the machine;
FIG. 3 is an end elevational view of the machine;
FIG. 4 is a sectional view of the lower part of the machine taken along line 4--4 in FIG. 2;
FIG. 5 is a detail drawing, to enlarged scale, of a pressure roller of the machine and strips interlocked thereby; and
FIG. 6 is a sectional view, to larger scale, along line 6--6 in FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The machine illustrated includes an upright base plate 10 having at its top corners shackles 11 to which are attached cables 12 from a winch or the like (not shown) by means of which the machine may be lifted and lowered, for example, into a man-hole.
The base plate 10 is apertured to accept the housing 13 for the bearings of a main shaft 14, the housing extending forwardly of the base plate 10 and having a peripheral flange 15 bolted to the rear face of the base plate.
A double sprocket 16 is keyed on the rear end of the
REFERENCES:
patent: 2731040 (1956-01-01), Warburton
patent: 4167645 (1979-09-01), Carey
patent: 4308082 (1981-12-01), Menzel
patent: 4375381 (1983-03-01), Carlson et al.
patent: 4490200 (1984-12-01), Dillon
patent: 4714508 (1987-12-01), Chivens et al.
Allen Peter
Molyneux Sydney
Danby Pty, Ltd.
Powell William A.
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