Patent ID: 8585095

Claim:
A telescopic tube joint for vacuum cleaner suction tubes and tripods, comprising: at least one outer tube and at least one inner tube, a catch recess in the at least one inner tube; a catch element in the at least one outer tube, and a rotary slide that locks and unlocks engagement of the catch recess with the catch element and which includes a recess in an inner peripheral area for receiving the catch element, wherein the catch recesses in the at least one inner tube include a tooth strip provided with a plurality of teeth disposed on an outer peripheral surface of the at least one inner tube and the catch element includes a short toothed rack having upwardly oriented opposing teeth and wherein the rotary slide pushes the toothed rack out of said rotary slide recess into force- and form-fit contact with the toothed strip in a locked position when turned at an angle (α), and wherein the toothed rack can be pushed back into said rotary slide recess into an unlocked position when said rotary slide is located turned back by said angle (α) such that said at least one inner and outer tubes may be moved relative to one another, wherein, when said rotary slide is located turned back by said angle (α), an axial sliding force is applied to the outer tube in a manner causing a surface of teeth of the toothed strip to push against a surface of opposing teeth of the toothed rack so as to move the toothed rack upwards at an angle (β) and into said rotary slide recess to obtain the unlocked position in which opposing teeth of the toothed rack hobble over the teeth of the toothed strip until the desired telescope expansion or insertion length has been achieved, wherein the toothed rack has a substantially rectangular shape (a width of B and a length of L) in the vertical positional view, which reaches with tolerance through a substantially rectangular opening of essentially the same size in the outer tube which defines said slide recess, wherein each rotary slide is provided with a said slide recess on its inner peripheral surface, which corresponds to the width B and length L of the toothed rack extending into the opening position, and is provided on at least one side of the slide recess with a continuously narrowing radial height which, to reach the locked position and by turning the rotary slide, presses the toothed rack with its opposing teeth into the spaces between the teeth of the toothed strip, and wherein the joint is adapted for connection to vacuum cleaner suction tubes and tripods with an orientation in which gravity will move the catch element in a direction away from the rotary slide recess.