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A clamping apparatus for a hiking pole for detachably axially fixing a pipe section that can be inserted into an opening of the clamping apparatus. The clamping apparatus has a plastic collar, which substantially directly encloses the pipe section at least in an axial section and clamps the same in

A clamping apparatus for a hiking pole for detachably axially fixing a pipe section that can be inserted into an opening of the clamping apparatus. The clamping apparatus has a plastic collar, which substantially directly encloses the pipe section at least in an axial section and clamps the same in the closed state, wherein at least in the region enclosing the pipe section the plastic collar has at least one axial slot making the circumference of the plastic collar variable in that region and is designed in a substantially peripheral manner in the remaining axial region. There are projections with a stop and a rotational axis for a clamping lever with an arm, the axis being arranged perpendicular to the axis of the transverse pin and perpendicular to the axis of the pipe section. The clamping lever also has a roll-off region, which is eccentric with respect to the rotational axis.

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1. A clamping device for a hiking pole, trekking pole, Nordic walking pole, ski pole or cross-country ski pole, for axially securing in a releasable manner a tube portion that can be pushed into an opening of the clamping device, wherein the clamping device comprises a plastics-material sleeve which

1. A clamping device for a hiking pole, trekking pole, Nordic walking pole, ski pole or cross-country ski pole, for axially securing in a releasable manner a tube portion that can be pushed into an opening of the clamping device, wherein the clamping device comprises a plastics-material sleeve which engages essentially directly around the tube portion, at least along an axial portion, and clamps the tube portion in a closed state,wherein the plastics-material sleeve, at least in a region engaging around the tube portion, has at least one axial slot, which renders a circumference of the plastics-material sleeve variable in said region, and is of an essentially encircling design in a remaining axial region,wherein a respective first protrusion and second protrusion is arranged on the plastics-material sleeve on either side of said axial slot,wherein said protrusions have a coaxial through-passage opening, which is arranged essentially perpendicularly to an axis of the tube portion and through which engages a transverse pin which, on an outside of the second protrusion, has a stop and, on an outside of the first protrusion, has a rotary pin for a clamping lever, said rotary pin being arranged perpendicularly to an axis of the transverse pin and parallel to the axis of the tube portion,wherein the clamping lever has a lever arm which, with the clamping device closed, engages at least partially around the plastics-material sleeve, andwherein the clamping lever has an eccentric rolling region around the rotary pin, it being possible for a distance between the stop and a counter-surface for the eccentric rolling region, the counter surface being arranged on the outside of the first protrusion, to be reduced by means of said eccentric rolling region for clamping purposes, by virtue of the clamping lever being pivoted into the closed position, andwherein the counter-surface is designed in the form of a metal element facing towards and in contact with said eccentric rolling region, and which metal element is arranged, at least in part, in the first protrusion, in a depression. 2. The clamping device as claimed in claim 1, wherein the counter-surface is designed as a planar surface. 3. The clamping device as claimed in claim 1, wherein the counter-surface is designed as a concave surface of which a radius of curvature thereof is adapted essentially to a radius of curvature of the rolling region. 4. The clamping device as claimed in claim 1, wherein the metal element is designed in the form of a metal band which encircles an outside of the plastics-material sleeve, on a side located opposite the protrusions, and of which a first end is arranged on the outside of the first protrusion, the outside being directed toward the rolling region, in a depression and has a first aperture or a through-opening for the transverse pin, a central region of which band runs around the plastics-material sleeve, and a second end of which band is arranged on the outside of the second protrusion, this outside being directed toward the stop, and has a second aperture or a through-opening for the transverse pin and/or a stop element. 5. The clamping device as claimed in claim 4, wherein the metal band has a width of 1-20 mm. 6. The clamping device as claimed in claim 4, wherein the metal band has a width of 3-7 mm. 7. The clamping device as claimed in claim 4, wherein the metal band has a thickness in the range of 0.1-2 mm. 8. The clamping device as claimed in claim 4, wherein the metal band consists of hardened steel, stainless steel or spring steel. 9. The clamping device as claimed in claim 1, wherein the metal element has a respective through-opening on either side of the counter-surface and the counter surface is formed by a crosspiece located therebetween, and wherein the transverse pin is designed in a fork-like manner at its clamping lever end, wherein the two fork arms engage through the through-openings, wherein the rotary pin is arranged at the ends of the fork arms, and connect the same, and wherein the eccentric rolling region of the clamping lever is arranged between the fork arms such that it runs on the crosspiece when the clamping lever pivots. 10. The clamping device as claimed in claim 9, wherein the metal element is designed in the form of a circular disk and is arranged in the depression in the first protrusion such that it can be displaced along the axis of the transverse pin, and wherein the depth of the depression is greater than the thickness of the metal element. 11. The clamping device as claimed in claim 9, wherein the metal element is designed in the form of a circular disk and is arranged in a depression in the first protrusion such that it can be displaced along the axis of the transverse pin, and in that the depth of the depression is greater than the thickness of the metal element, wherein the thickness of the metal element is in the range of 0.5-3 mm, and the depth of the depression is in the range of 3-10 mm. 12. The clamping device as claimed in claim 1, wherein the transverse pin is of T-shaped design at its clamping-lever end, wherein the lateral arms form the rotary pin for the clamping lever, and the clamping lever, for the transverse pin, has a slot which divides up the eccentric rolling region into two rolling regions arranged to the sides of the transverse pin. 13. The clamping device as claimed in claim 1 wherein the plastics-material sleeve, in an upper portion, has at least two axially running slots, wherein at least one of said slots is arranged between the two protrusions. 14. The clamping device as claimed in claim 1, wherein the stop is of adjustable design. 15. The clamping device as claimed in claim 1, wherein it is formed, in the remaining axial region, for the purpose of receiving and fastening the portion of an outer tube, wherein the outer tube has an internal diameter which is essentially equal to, or only insignificantly greater than, the external diameter of the tube portion. 16. The clamping device as claimed in claim 1, wherein the through-passage opening in the two protrusions is a hole which is closed all the way round. 17. The clamping device as claimed in claim 1, wherein the lever arm, with the clamping device closed, is arranged, at least in part, in a depression in the plastics-material sleeve, and/or wherein the lever is produced from metal, wholly or partially from surface-hardened metal. 18. A hiking pole, trekking pole, Nordic walking pole, ski pole or cross-country ski pole, having a clamping device as claimed in claim 1. 19. The pole as claimed in claim 18, wherein, in addition to the clamping device, a clamping device with at least one spreading element is provided on the inside of the tube portions. 20. The clamping device as claimed in claim 1, wherein the metal element is designed in the form of a single-piece metal band which encircles the outside of the plastics-material sleeve, on the side located opposite the protrusions, and of which the first end is arranged on the outside of the first protrusion, the outside being directed toward the rolling region, in a depression and has a first aperture or a through-opening for the transverse pin, the central region of which band runs around the plastics-material sleeve, in an encircling depression, and the second end of which band is arranged on the outside of the second protrusion, this outside being directed toward the stop, in a depression, and has a second aperture or a through-opening for the transverse pin and/or a stop element. 21. The clamping device as claimed in claim 1, wherein the plastics-material sleeve, in its upper portion, has at least three, axially running slots, wherein at least one of these slots is arranged between the two protrusions and these slots are distributed uniformly around the circumference. 22. The clamping device as claimed in claim 1, wherein the stop is of adjustable design, and wherein the stop is designed with a thread and the transverse pin is designed with a mating thread, and the stop is designed as a nut or screw, with an encircling toothing formation or a ridge or a groove for the engagement of an adjustment tool. 23. The clamping device as claimed in claim 1, wherein the through-passage opening in the two protrusions is a hole which is closed all the way round and has a diameter in the range of 2-7 mm. 24. The clamping device as claimed in claim 1, wherein the lever arm, with the clamping device closed, is arranged, at least in part, in a depression in the plastics-material sleeve, and wherein the lever is produced from metal, wholly or partially from surface-hardened metal, hardened in the rolling region, and wherein formed-on plastics-material regions, made of easy-to-grip material, are provided. 25. A hiking pole, trekking pole, Nordic walking pole ski pole or cross-country ski pole, having a clamping device as claimed in claim 1, for the length adjustment of at least two tube portions or three tube portions. 26. A clamping device for a hiking pole, trekking pole, Nordic walking pole, ski pole or cross-country ski pole, for axially securing in a releasable manner a tube portion that can be pushed into an opening of the clamping device, wherein the clamping device comprises a plastics-material sleeve which engages essentially directly around the tube portion, at least along an axial portion, and clamps the tube portion in a closed state,wherein the plastics-material sleeve, at least in a region engaging around the tube portion, has at least one axial slot, which renders a circumference of the plastics-material sleeve variable in said region, and is of essentially encircling design in a remaining axial region,wherein a respective first protrusion and second protrusion is arranged on the plastics-material sleeve on either side of said slot,wherein said protrusions have a coaxial through-passage opening, which is arranged essentially perpendicularly to an axis of the tube portion and through which engages a transverse pin which, on an outside of the second protrusion, has a stop and, on an outside of the first protrusion, has a rotary pin for a clamping lever, said rotary pin being arranged perpendicularly to an axis of the transverse pin and parallel to the axis of the tube portion,wherein the clamping lever has a lever arm which, with the clamping device closed, engages at least partially around the plastics-material sleeve,wherein the clamping lever has an eccentric rolling region around the rotary pin, it being possible for a distance between the stop and a counter-surface, which is arranged on the outside of the first protrusion, to be reduced by means of said eccentric rolling region for clamping purposes, by virtue of the clamping lever being pivoted into the closed position,wherein the counter-surface is designed in the form of a metal element facing towards and in contact with said eccentric rolling region, and which metal element is arranged, at least in part, in the first protrusion, in a depression,wherein the transverse pin has, at its one end, a flattened portion, having arranged therein a transversely running through-passage opening for the rotary pin,wherein the metal element has an elongate non-circular through-passage opening for the flattened portion of the transverse pin, the elongate non-circular through-passage opening of the metal element having essentially a same cross-sectional area as the flattened portion of the transverse pin, andwherein the cross-sectional area of the flattened portion of the transverse pin is designed just enough smaller than a cross-sectional area of the elongate non-circular through-passage opening of the metal element, to allow receipt of the flattened portion of the transverse pin by said elongate non-circular through passage of the metal element.