Metal deforming – By tool-couple pressing together adjacent surface portions... – To form helically-seamed tube
Patent
1987-12-02
1989-04-25
Combs, E. Michael
Metal deforming
By tool-couple pressing together adjacent surface portions...
To form helically-seamed tube
72132, 82 531, 82 82, B21C 3712
Patent
active
048235792
ABSTRACT:
An apparatus for cutting spirally formed pipe is disclosed. This apparatus has two knives mounted on a boom to be positioned inside of the pipe. The inner knives have cutting edges that are adjacent the inner pipe surface and point in opposite directions. Two knives are also positioned outside of the pipe. Each outer knife is positioned opposite of one of the inner knives. The outer knives are continuously reciprocated toward and away from their respective opposed inner knife. The reciprocating outer knives are maintained in a position clear of the pipe while the spiral pipe is formed. The reciprocating outer knives are moved to a cutting position where their cutting edges move into and out of an overlapping relationship with the cutting edges of their respective inner knives to cut the pipe. The inner knives and reciprocating outer knives are connected to an axial motion pneumatic cylinder and a sliding guide shaft system that allow the knives to move in the axial direction of the axially moving pipe during the cutting process. The inner and outer knives are thus adapted to cooperate to rectangularly cut a spirally moving pipe into sections.
REFERENCES:
patent: 694524 (1902-03-01), Boyd
patent: 957966 (1910-05-01), Jenkins
patent: 3132616 (1964-05-01), Hale
patent: 3913430 (1975-10-01), Van Dijk
patent: 4054069 (1977-10-01), Coop
patent: 4567742 (1986-02-01), Castricum
patent: 4706481 (1987-11-01), Castricum
patent: 4744276 (1988-05-01), Duce
Combs E. Michael
Spiro America Inc.
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