Stock material or miscellaneous articles – All metal or with adjacent metals – Intermediate article
Patent
1979-03-15
1981-07-21
Hunt, Brooks H.
Stock material or miscellaneous articles
All metal or with adjacent metals
Intermediate article
428592, 138154, F16L 916, F16L 1116
Patent
active
042799651
ABSTRACT:
PCT No. PCT/SE 78/00023 Sec. 371 Date Apr. 2, 1979 Sec. 102(e) Date Mar. 15, 1979 PCT Filed Jul. 15, 1978 PCT Pub. No. WO79/00079 PCT Pub. Date Feb. 22, 1979
Blank for pipe manufacture, intended to be wound helically so that a joint is formed between adjacent turns in the helically wound blank thereby, that a portion on the lateral edge (11) of the blank in a turn is fitted into a portion of the remaining lateral edge (12) of the blank in an adjacent turn.
A portion (13) located between said two portions on the lateral edges of the blank has an outward bulge enclosing a cavity. Said bulge is of such a shape that the surface (18) of the cavity enclosed in a section through the transverse direction of the blank is substantially greater than the surface (21) in said section between the two adjacent edges (19,20) on the blank, which are the places of attachment for the bulge. The surface (18) of the cavity further includes distances (22) in said section substantially in parallel with the transverse direction of the wall blank, which distances are substantially longer than the distance (21) between said adjacent edges (19,20) on the blank.
When forming a pipe of the blank, the bulge is located on the outside of the completed pipe. The bulge has the twofold object of providing a pipe formed of the blank with the function of an elastic bellows, in order to reduce stresses at movements of the pipe, and of rendering the pipe more rigid against compression.
REFERENCES:
patent: 1761034 (1930-06-01), Gillett
patent: 3352649 (1967-11-01), Tennison, Jr.
patent: 3495628 (1970-02-01), Boender
patent: 4161194 (1979-07-01), Nyssen
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