초록 ▼

The invention relates to an expansion tool for expanding tube ends. The expansion tool has an expansion mandrel and a counter-support, said expansion mandrel consisting of a tow-bar and an elastic rubber expansion element surrounding it. The counter-support supports the expansion element on the base

The invention relates to an expansion tool for expanding tube ends. The expansion tool has an expansion mandrel and a counter-support, said expansion mandrel consisting of a tow-bar and an elastic rubber expansion element surrounding it. The counter-support supports the expansion element on the base extremity and radially surrounds it at a distance. In order to improve an expansion tool of the above-described kind, the tow-bar is anchored in a bolt fastening element and the counter-support can be impinged upon via a pressure bar element that projects beyond the bolt fastening element in the longitudinal direction of the tow-bar.

대표청구항 ▼

The invention claimed is: 1. An expansion tool for expanding tube ends comprising: an expansion mandrel including a pull rod and an elastic rubber expansion element having a foot end which surrounds said pull rod, said pull rod having an axis defining an axial direction; and a counter-support suppo

The invention claimed is: 1. An expansion tool for expanding tube ends comprising: an expansion mandrel including a pull rod and an elastic rubber expansion element having a foot end which surrounds said pull rod, said pull rod having an axis defining an axial direction; and a counter-support supporting the expansion element at the foot end and surrounding said expansion element radially at a spacing therefrom, fastening element in which said pull rod is anchored, said fastening element having a push-rod element which extends beyond an end of said fastening element in said axial direction of said pull rod, and a bolt connecting said fastening element to a device acting on the push-rod element, and the counter-support being engageable by said push-rod element. 2. An expansion tool according to claim 1, wherein the fastening element has a bolt-accommodating bore running transversely to the axial direction defined by the pull rod. 3. An expansion tool according to claim 1, wherein the push-rod element is secured in the counter-support. 4. An expansion tool according to claim 1, wherein the push-rod element passes through the fastening element. 5. An expansion tool according to claim 1, wherein the push-rod element is a ram. 6. An expansion tool according to claim 1, wherein more than two push-rod elements are provided. 7. An expansion tool according to claim 1, wherein said counter-support is in cup form having a cup base, an inside of the cup base having a step which accommodates a foot region of the expansion element. 8. An expansion tool according to claim 7, wherein the step provides a stop for a tube end which is to be expanded. 9. An expansion tool according to claim 1, wherein a screw-in adapter part is provided in the fastening element for adaptation to different pull-rod diameters. 10. An expansion tool according to claim 1, further including a pressure plate disposed upstream of the counter-support, the push-rod element acting on said pressure plate, and a force-limiting device disposed between the pressure plate and the counter-support. 11. An expansion tool according to claim 10, wherein the force-limiting device comprises a plastics-material component. 12. An expansion tool according to claim 11, wherein the plastics-material component has a higher stiffness than the expansion element. 13. An expansion tool according to claim 1, further including an expansion transition element disposed downstream of the expansion element, said expansion transition element being held captive by the pull rod. 14. An expansion tool according to claim 13, wherein the expansion transition element comprises a plastics-material component with stop-limited compression. 15. An expansion tool according to claim 14, wherein the stop-limited compression comprises a stop sleeve which can be moved against stop ring which bounds the expansion element. 16. An expansion tool according to claim 15, wherein the stop sleeve has a sleeve base which is acted upon by a head of the pull-rod and merges into a tubular portion which surrounds the pull rod. 17. An expansion tool according to claim 1, further including a female-die element within the counter-support. 18. An expansion tool according to claim 17, wherein said female-die element is longitudinally split and is made up of a plurality of female sub-dies. 19. An expansion tool according to claim 17, wherein the female-die element engages beneath the elastic rubber expansion element. 20. An expansion tool according to claim 1, wherein during pressing, a female sub-die can be displaced axially from a removal position for the tube end which is to be expanded into a pressing position, the radial distance from the pull rod being reduced during pressing. 21. An expansion tool according to claim 17, wherein the counter-support (9) has a guide slope formed or an interior thereof, said female-die element having a guide protrusion, said guide slope interacts with said guide protrusion. 22. An expansion tool according to claim 17, wherein in the axial direction the counter-support has two spaced-apart guide slopes formed on an interior thereof, said guide slopes being disposed at different radial spacing from the pull rod. 23. An assembly comprising: a pressing device; and an expansion tool for expanding tube ends, the expansion tool having an expansion mandrel comprising a pull rod and an elastic rubber expansion element having a foot end which surrounds the pull rod, and a counter-support supporting the expansion element at the foot end of the elastic rubber expansion element and surrounding said expansion element radially at a spacing therefrom, a push-rod element moveable by said pressing device, the pull rod being fixedly connected to the pressing device, while the counter-support being engageable by said push-rod element. 24. An assembly according to claim 23 wherein the pull rod is anchored in a fastening element. 25. An assembly according to claim 24, wherein the push-rod element projects beyond an end of the fastening element in the axial direction defined by the pull rod. 26. An assembly according to claim 24, wherein the fastening element has a bolt-accommodating bore running transversely to the axial direction of the pull rod. 27. An assembly according to claim 24, wherein the push-rod element passes through the fastening element. 28. An assembly according to claim 23, wherein more than two push-rod elements are provided. 29. An assembly according to claim 23, wherein the push-rod element is a ram which butts against the counter-support, but is not connected thereto. 30. An assembly according to claim 29, wherein the pressing device acts on the push-rod element via rollers. 31. An expansion tool for expanding tube ends comprising: an expansion mandrel comprising a pull rod and an elastic rubber expansion element having a foot end which surrounds the said pull rod, said pull rod having an axis defining an axial direction; a counter-support supporting the expansion element at the foot end and surrounding the foot end radially at a spacing therefrom; a bolt-fastening element having two sides, said pull rod being anchored in said bolt-fastening element; a push-rod element which extends on both sides beyond the bolt-fastening element in said axial direction of the pull rod, said counter-support being engageable by said push-rod element; and a bolt-accommodating bore provided in said bolt-fastening element, said bolt-accommodating bore extending transversely to the longitudinal direction of the pull rod.