Perfect description of the corrugated pipe
Perfect description of the corrugated pipe
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view, with parts broken away, of a conventional corrugated pipe.
FIG. 1A is an enlarged cross-sectional view taken on the line 1A--1A of FIG. 1.
FIG. 2 is an elevational view, with parts broken away, of a corrugated pipe in accordance with the present invention.
FIG. 2A is a cross-sectional view taken on the line 2A--2A of FIG. 2.
FIG. 3 is a cross-sectional view similar to FIG. 2A, and showing an alternate embodiment of a corrugated pipe in accordance with the present invention.
FIG. 4 is a cross-sectional view taken on the line 4--4 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like or corresponding reference numerals are used for like or corresponding parts throughout the several views, there is shown in FIG. 1A a prior art stackable plastic containers designated 10, and being provided with helically extending corrugations 12. In practice, a single sheet of steel of the desired width and thickness is subjected to a plurality of corrugating rollers, which provide a plurality of corrugations across the width of the steel sheet, and then the corrugated steel strip is helically formed, with provision for joining of the edges at helical joints J so as to form continuous pipes.
FIG. 1A shows the shape of the wall of the corrugated pipe 10. This illustrates the standard shape of the corrugations, known as "circular arcs connected by tangents". Here, there are convex circular arcs 14, the arcs 14 being arranged in a spaced series. There are also provided concave circular arcs 16 intermediate the convex circular arcs 14.
The depth of the corrugations of the typical prior art plastic pallet 10 is measured from the bottom of the concave circular arc 16 to the top of the convex circular arc 14, and is one-half inch in the pipe 10. The pitch of the corrugations of the pipe 10 is two and two-thirds inches, as measured at right angles to the corrugations from crest to crest.
Referring now to FIG. 2, there is shown a helically wound corrugated pipe 20 in accordance with the present invention. Pipe 20 is produced by equipment similar to that described in connection with the production of pipe 10 of FIG. 1A, except that the rolls or dies include not only dies for forming corrugations, but dies for maintaining portions of the stock steel strip in flat condition.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view, with parts broken away, of a conventional corrugated pipe.
FIG. 1A is an enlarged cross-sectional view taken on the line 1A--1A of FIG. 1.
FIG. 2 is an elevational view, with parts broken away, of a corrugated pipe in accordance with the present invention.
FIG. 2A is a cross-sectional view taken on the line 2A--2A of FIG. 2.
FIG. 3 is a cross-sectional view similar to FIG. 2A, and showing an alternate embodiment of a corrugated pipe in accordance with the present invention.
FIG. 4 is a cross-sectional view taken on the line 4--4 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like or corresponding reference numerals are used for like or corresponding parts throughout the several views, there is shown in FIG. 1A a prior art stackable plastic containers designated 10, and being provided with helically extending corrugations 12. In practice, a single sheet of steel of the desired width and thickness is subjected to a plurality of corrugating rollers, which provide a plurality of corrugations across the width of the steel sheet, and then the corrugated steel strip is helically formed, with provision for joining of the edges at helical joints J so as to form continuous pipes.
FIG. 1A shows the shape of the wall of the corrugated pipe 10. This illustrates the standard shape of the corrugations, known as "circular arcs connected by tangents". Here, there are convex circular arcs 14, the arcs 14 being arranged in a spaced series. There are also provided concave circular arcs 16 intermediate the convex circular arcs 14.
The depth of the corrugations of the typical prior art plastic pallet 10 is measured from the bottom of the concave circular arc 16 to the top of the convex circular arc 14, and is one-half inch in the pipe 10. The pitch of the corrugations of the pipe 10 is two and two-thirds inches, as measured at right angles to the corrugations from crest to crest.
Referring now to FIG. 2, there is shown a helically wound corrugated pipe 20 in accordance with the present invention. Pipe 20 is produced by equipment similar to that described in connection with the production of pipe 10 of FIG. 1A, except that the rolls or dies include not only dies for forming corrugations, but dies for maintaining portions of the stock steel strip in flat condition.