Back to results
US 4,285,222 AGranted
Machine for manufacture of spiral tubing with folded seam
AssigneeKurt Hedlund
InventorKjell-Inge Jagelid
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKurt Hedlund
InventorKjell-Inge Jagelid
Estimating the term…
A machine for the manufacture of helically seamed tubing, including a number of preshaping roller pairs for a strip material and a folding roller pair, arranged to form a folded seam in the strip material while feeding it to a coiling and tube shaping tool, each roller pair being driven by a separate hydraulic motor arranged to drive one of the rollers, the second roller being driven by a cog wheel transmission from the first, the second roller being movable in relation to the first roller in the same roller pair and being spring loaded in the direction towards same the first. The hydraulic motors are connected to each other in series, thus driving the successive individual roller pairs with a successively reduced speed, each roller including at least one surrounding circumferential groove, into which semi-circular ring members having an outwardly extending portion, or a groove, at the outer peripheral surface, are insertable and attachable.
In a machine for the manufacture of helically seamed tubing, including a plurality of successive roller pairs adapted to preshape a strip material, and a helical coiling tube shaping tool adapted to join two edge portions of the strip material by means of said folded seam the improvement comprising each pair of rollers is provided with a separate hydraulic drive motor operatively connected to a first roller, the second roller being driven by the first roller via a transmission means, fluid pressure means for driving said motors, said motors being connected in series in a hydraulic circuit from said fluid pressure means whereby the outlet of each motor is connected to the inlet of the motor for the next successive pair of rollers.
Dependencies are inferred from the claim text.