Patent ID: 9480314
Filing Date: 2016-11-01
CPC Classification: A45B,A63C,F16B

Claim Text:
1. A length-adjustable tube, for sticks including ski poles, trekking poles, cross-country poles and Nordic walking poles, said length-adjustable tube having at least one outer tube and one inner tube which is telescopically insertable into the outer tube for adjusting the tube length, and having an expanding device which is held at the insertion end of the inner tube and by way of which the inner tube is axially clampable in the outer tube and which comprises an expanding element, which can be pushed apart radially and is provided with a female cone, an inner element, which is provided with an opposing male cone and is configured for interaction with the female cone in an axially displaceable manner in the expanding element, and an axially directed adjustment screw which is held non-rotatably on the inner tube and is in operative connection with an internally threaded bore in the inner element, wherein the expanding element has a thread-free passage opening through which the adjustment screw passes, wherein a clamping portion is arranged on or in the expanding element, which clamping portion, in the radial direction, at least in the region of a contact surface, has a greater radius in the relaxed state than the radius of the expanding element in its expanding region which is brought about as a result of the interaction with the inner element, wherein the clamping portion is offsettable or displaceable inward at least in the region of the contact surface in an elastic manner against a resetting force toward a central axis at least as far as up to the radius of the expanding element, wherein in its axial region which faces the inner tube, the expanding element has a cylindrical portion which is only expanded a little or is substantially not expanded by the inner element, and wherein the clamping portion is arranged in said cylindrical portion, and wherein the clamping portion is developed in the form of at least one elastic tongue which is realized by two axially extending slots separate from the cylindrical portion and which is connected at least on one side to the cylindrical portion by means of an arm which acts as an elastic link to the cylindrical portion.