Patent ID: 8727383

Claim:
A telescopic vacuum cleaner suction tube, comprising: an outer tube through which a vacuum can be drawn, an inner tube through which a vacuum can be drawn and that is provided with at least one axial row of snap-in depressions, the inner tube being slidable in an axial direction within the outer tube in a telescopic manner, an anti-twisting mechanism and an interlocking device with a spring which has a snap-in element formed on the spring between free ends of the spring, and the snap-in element engaging into a nearest one of the snap-in depressions of the inner tube under the prestress of the spring, an actuating element situated in a gap between the free ends of the spring and being operable for disengaging the snap-in element from the one of the snap-in depressions in which the snap-element is engaged, and a guide sleeve which restrains the spring from axial movement without the spring being mechanically fastened to either the inner tube or the outer tube, wherein the spring encompasses one of the outer tube and the inner tube, wherein the actuating element is operable for moving the free ends of the spring relative to each other to flex the spring in a manner forcing the snap-in element radially out of the snap-in depression in which it is engaged to free the tubes for relative axial sliding movement, wherein the actuating element is formed by a push-button on the outer tube that is movable in a direction perpendicular to said axial direction, characterized in that the push-button engages into the funnel-shaped intermediate space ( 14 ) between inwardly or outwardly bent ends ( 12 , 13 ) of the spring ( 6 ) with its conical or wedge-shaped end ( 9 a ) that faces the spring ( 6 ), and upon release, the push-button is raised into a raised starting position within a surrounding housing ( 11 ) under the prestress of the spring ( 6 ) in the engaged position of the suction tube.