Metal deforming – By tool-couple pressing together adjacent surface portions... – To form helically-seamed tube
Patent
1984-01-10
1986-02-04
Combs, E. Michael
Metal deforming
By tool-couple pressing together adjacent surface portions...
To form helically-seamed tube
B21C 3712
Patent
active
045677425
ABSTRACT:
An apparatus for producing multiple ribbed, spiral seamed pipe from a metal strip thinner than 29 gauge is disclosed. The apparatus includes the conventional elements of a frame, a drive roller for feeding the strip through the frame, a flange roller and folding finger for bending the outer edges of the metal strip, a forming head for forming the strip into a pipe so that the outer edges of the strip mate, and a clinching roller and contra roller for compressing the mated edges to produce a spiral seam. The present invention improves this conventional apparatus by providing only two pairs of edge forming roller assemblies that cooperate to bend the left edge of the strip perpendicular to the strip, and the right edge of the strip into an upward facing, V-shaped channel with its outer edge perpendicular with respect to the strip. Five pairs of corrugation rollers are mounted on the frame adjacent to the edge forming roller assemblies. These corrugation rollers cooperate to form three continuous, openchannel corrugation grooves in the metal strip. Each succeeding corrugation roller pair forms the corrugation grooves deeper and narrower than the preceding pair. Three pairs of squeezer assemblies are mounted in the frame adjacent to the corrugation roller means to squeeze together the sides of the corrugation grooves to produce three parallel support ribs for the pipe.
REFERENCES:
patent: 3132616 (1964-05-01), Hale et al.
patent: 3220234 (1965-11-01), Harper
patent: 3606779 (1971-09-01), Parma
patent: 3982414 (1976-09-01), Anderson
patent: 4244202 (1981-01-01), Anderson et al.
Finnish patent application No. 344/71-Oy Nokia AB: translation of claims and figures.
United McGill "Uni-Rib" advertisement.
Operation Instructions, Spiro Tubeformer 700.
Operation Instructions, Spiro Tubeformer MR.
Combs E. Michael
Spiro America Inc.
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