Patent ID: 6220389
Filing Date: 2001-04-24
Classification: E06C

Abstract:
An extendable ladder including ladder elements, the ladder being telescopically extended by means of pull-out sections movable on said ladder elements, whereby the pull-out sections are fixed by means of a locking mechanism in one of several positions on the respectively associated ladder element on one of its rungs constructed as a hollow-profile section, said locking mechanism including a locking bolt guided into the hollow-profile section of the rung under the action of an adjusting spring and with a handle for locking said locking bolt in one of the positions, and whereby said locking bolt fixed on the handle is axially movably supported in a guide element mounted on the ladder element, wherein the guide element is fastened on the ladder element by a bayonet fitting comprising a guide flange provided on the front side of the guide element and a counter flange that concentrically surrounds, in the ladder element, a guide hole for the guide element, wherein the guide flange includes at least three holding elements guided through surface-complementary holding recesses of the counter flange, and, after an axial rotation of the guide flange against the counter flange, rest on its front surface not facing the guide element, whereby an annular flange of the guide element, abutting the ladder element, fixes the axial introduction of the guide flange into the ladder element.