| 摘要 |
<p>A tubular extension, particularly for electric household appliances and cleaning machines in general, comprising at least two tubular elements telescopically associated with each other, a first one (11) of these tubular elements being associated coaxially with a second one (13) having a smaller cross-section and being slideable inside the first tubular element, one of these first and second tubular elements having at least one sliding portion (14) whereat the outer or inner lateral surface is shaped so as to form at least one step (15), wherefrom the cross-section gradually increases radially and along a given peripheral arc, a longitudinal cavity (16) being formed at the peripheral arc, and a tooth (17) having a similar shape fitting snugly and reversibly in the cavity (16) after sliding over a portion of the surface relative to the peripheral arc, the tooth (17) being formed at the inner or outer surface of the other one of the first and second tubular elements on the side where mutual coupling occurs upon assembly. During the sliding of the first and second tubular elements with respect to each other, the tooth (17) is adjacent to the corresponding step (15), which is thus adapted to form a stroke limiter. <IMAGE></p> |
