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1. (WO1979000079) BLANK FOR PIPE MANUFACTURE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000079 International Application No.: PCT/SE1978/000023
Publication Date: 22.02.1979 International Filing Date: 17.07.1978
IPC:
B29C 53/78 (2006.01) ,F16L 11/16 (2006.01) ,F16L 9/16 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
53
Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
56
Winding and joining, e.g. winding spirally
58
helically
78
using profiled sheets or strips
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
L
PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
11
Hoses, i.e. flexible pipes
14
made of rigid material, e.g. metal or hard plastics
16
wound from profiled strips or bands
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
L
PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
9
Rigid pipes
16
wound from sheets or strips, with or without reinforcement
Applicants:
Inventors:
Priority Data:
770878702.08.1977SE
Title (EN) BLANK FOR PIPE MANUFACTURE
(FR) EBAUCHE POUR LA FABRICATION D"UN TUBE
Abstract:
(EN) 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.
(FR) Ebauche pour la fabrication d"un tube, destinee a etre enroulee helicoidalement de maniere a former un joint entre deux spires adjacentes dans une ebauche enroulee helicoidalement. A cet effet, une partie sur un bord lateral (11) de l"ebauche dans une spire s"ajuste dans une partie de l"autre bord lateral (12) de l"ebauche dans une spire adjacente. Une partie (13) situee entre les deux dites parties sur les bords lateraux presente une saillie vers l"exterieur enfermant une cavite. Cette saillie a une forme telle que la surface (18) de la cavite comprise dans une coupe transversale de l"ebauche est sensiblement plus grande que la surface (21) comprise dans ladite section entre les deux bords adjacents (19, 20). Ces derniers sont les endroits de fixation de la protuberance. La surface (18) de la cavite inclut de plus des distances (22) dans ladite coupe sensiblement parallele a la direction transversale de l"ebauche formant paroi. Ces distances sont plus grandes que la distance (21) entre les bords adjacents (19, 20) sur l"ebauche. Lorsqu"on forme un tube, la saillie se trouve a l"exterieur du tube termine. Elle a deux effets: donner au tube le role d"un soufflet elastique de maniere a reduire les contraintes lors de mouvements du tube, et rendre le tube plus resistant a la compression.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)