Continuously advancing mandrel

Details Continuously advancing mandrel Continuously advancing mandrel

B - Operations, Transporting

31

C

154/8.14

B31C 3/00 (2006.01) B29C 53/58 (2006.01) B29C 53/74 (2006.01) F16L 11/112 (2006.01) F16L 11/115 (2006.01) F16L 11/118 (2006.01)

Patent

CA 1127947

A B S T R A C T A continuously advancing definite length mandrel device wherein a cylindrical mandrel surface is formed by helically wound closed-loop belt convolutions, improved in that a plurality of belts are employed to form the surface. The device has a frame and a tubular mandrel core axially rotatable with respect to the frame and drive means for rotating the core. A plurality of closed-loop belts each have portions wrapped helically about the core in multiple lead fashion with their convolutions defining a mandrel surface, whereby as the core is rotated additional con- volutions of the belts are drawn onto one end of said core. Feed- ing means on the frame urge all of the convolutions toward the opposite end of the core. All of the convolutions are maintained in a sliding fit about the core. A belt guide at the opposite end of the core is fixed with respect to the frame for collapsing the successive convolutions inwardly and returning each belt through the inside of the core toward the first mentioned end thereof. The guide is formed with a plurality of grooves for receiving the respective plurality of belts, these grooves being of equal length along their centerlines.

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