Apparatus for use in corrugating metal hose

Claim 1

A HELICAL CORRUGATOR FOR CORRUGATING A LENGTH OF METAL HOSE COMPRISING FIRST AND SECOND ANNULAR FORMING DISCS ENCIRCLING SAID HOSE CIRCUMFERENTIALLY AND INDENTABLY BEARING THEREON, SAID FORMING DISCS BEING AXIALLY SPACED APART AND ANGLED TRANSVESELY TO SAID LENGTH OF METAL HOSE, SAID FORMING DISCS BEING RADIALLY OFFSET AND OPPOSITELY ANGLED ONE TO THE OTHER, SAID FORMING DISCS BEING MOUNTED FOR FREE ROTATION ABOUT SAID HOSE; MEANS FOR ROTATING SAID FORMING DISCS SYNCHRONOUSLY ABOUT SAID HOSE TO FORM A CORRUGATION IN THE HOSE HAVING A RELATIVELY LARGE PITCH; A PLURALITY OF CIRCUMFERENTIALLY SPACED APART COMPRESSION ROLLERS LOCATED AT A DISTANCE AXIALLY DISPLACED FROM SAID FORMING DISC AND ROTATING SYNCHRONOUSLY WITH SAID FORMING DISCS ABOUT SAID HOSE, SAID COMPRESSION ROLLERS INDENTABLY COMPRESSINGLY BEARING ON OPPOSITE SIDES OF THE CORRGUATION FORMED IN THE METAL HOSE BY SAID ANNULAR FORMING DISCS; AND MEANS FOR ROTATING SAID COMPRESSION ROLLERS SYNCHRONOUSLY WITH SAID FORMING DISCS TO REDUCE THE PITCH OF THE CORRUGATION.