초록 ▼

Apparatus for forming a corrugated tube from a smooth walled starting tube comprises a pair of receiving mandrels aligned spaced from each other along a preferably vertical axis and movable toward and away from each other to be engaged in opposite end portions of a starting tube. The halves of split

Apparatus for forming a corrugated tube from a smooth walled starting tube comprises a pair of receiving mandrels aligned spaced from each other along a preferably vertical axis and movable toward and away from each other to be engaged in opposite end portions of a starting tube. The halves of split corrugation forming discs and the halves of an end member above the uppermost of the discs, coupled together for limited movement in axial direction, are respectively carried and guided for movement in axial direction by a pair of clamping jaws tiltable between an open position permitting to align a starting tube with the mandrels and a closed position closing the split discs and the split end member and fluid tightly clamping opposite end portions of the starting tube located about said mandrels respectively between one of the mandrels and the closed end member and between the other mandrel and the clamping jaws. A channel for introducing pressure fluid into the interior of the starting tube leads through the other mandrel, while a ventilating channel in which a ventilating valve is arranged serves to discharge air from the starting tube during introduction of pressure fluid thereinto. A fluid operated cylinder and piston unit cooperates with the end member and the receiving mandrel engaged thereby for moving both elements in axial direction towards the other mandrel to thereby offset the starting tube and to deform the same into a corrugated tube.

대표청구항 ▼

Apparatus for producing a corrugated tube from a smooth walled starting tube, comprising support means; a pair of coaxial receiving mandrels axially spaced from each other and movable in axial direction toward each other; means mounted on said support means for moving said mandrels toward each other

Apparatus for producing a corrugated tube from a smooth walled starting tube, comprising support means; a pair of coaxial receiving mandrels axially spaced from each other and movable in axial direction toward each other; means mounted on said support means for moving said mandrels toward each other to tightly engage into opposite end portions of a starting tube placed axially aligned with said mandrels on said support means; a plurality of split corrugation forming discs superimposed and axially spaced from each other; a split end member arranged at one end of said superimposed discs; means connecting said discs and said end member for axial movement relative to each other; a pair of clamping jaws respectively carrying said split discs and said split end member, said clamping jaws being tiltable between an open position permitting to align a starting tube with said mandrels and a closed position fluid tightly clamping one end portion of the starting tube between one of said mandrels and the closed end member and the other end portion of the starting tube between the other mandrel and said clamping jaws; means for feeding a pressure fluid into the interior of the starting tube and for discharging such pressure fluid from the finished corrugated tube; and offsetting means cooperating with said end member for moving the latter together with said one mandrel in axial direction toward the other mandrel to transform the starting tube into a corrugated tube.