Apparatus for continuously producing tube having helical grooves

Details Apparatus for continuously producing tube having helical grooves Apparatus for continuously producing tube having helical grooves

1987-04-09

1988-04-05

Spruill, Robert L.

Metal deforming

By twisting axially moving work

With adjustment of machine or variation in effect of tool on...

291573AH, 72299, 72371, B21B 1502, B21D 1114

Patent

active

047350717

ABSTRACT:
An apparatus for continuously producing a tube having helical grooves in its inner surface comprising a tube twising rotary frame, a pay-off drum mounted on the rotary frame for paying off a tube having straight grooves in its inner surface, a nozzle provided at the front end of the rotary frame and having an adjustable inside diameter for sending out the paid-off tube forwardly of the rotary frame, and at least one pair of catching rollers provided in front of the rotary frame and disposed close to the nozzle for holding the sent-out tube. Each of the catching rollers is formed in its peripheral surface with a groove of semicircular cross section in conformity with approximately one-half of the outer periphery of the tube. With the rotation of the rotary frame, the straight-grooved tube is twisted between the nozzle and the catching rollers, whereby the straight grooves are deformed to helical grooves.

REFERENCES:
patent: 1887837 (1932-11-01), Frank
patent: 1951687 (1934-03-01), Zapf
patent: 2503987 (1950-04-01), Anderson
patent: 3422518 (1969-01-01), French
patent: 3662582 (1972-05-01), French
patent: 3776018 (1973-12-01), French
patent: 3961514 (1976-06-01), Geary

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