Patent EA-002500-B1 (EA)
Title: Telescopicextension for electric household appliances
Inventor: CANALE GIUSEPPE
IPC: F16L27/12
Filed: 2000-10-10
Abstract: 1. Telescopic extension for an electric household appliance comprising: a) an inner tube and an outer tube sliding inside one another, b) a sleeve fastened to said outer tube, c) at least one first constraining means capable of locking together said inner tube) and said outer tube, d) a flat and long thrusting slider, engaging at least said first constraining means under the action of resilient means, and e) actuating means operationally connected to said thrusting slider, f) said inner tube being provided with a row of notches of predefined shape, g) said outer tube having a cross-section of substantially constant diameter and having a lateral opening, h) said first constraining means and thrusting slider being movably supported by said sleeve, i) said thrusting slider acting on said first constraining means, through the action of said resilient means, so as to force said first constraining means inside a first notch of said inner tube and lock said inner tube inside said outer tube; j) said actuating means being capable of disengaging said thrusting slider from said first constraining means so as to leave said first constraining means free to move radially and come out of said first notch, releasing said inner tube from said outer tube and allowing said inner tube to slide with respect to said outer tube so as to adjust the length of said extension, characterized in that k) said sleeve is arranged between said inner tube and said <DP=2outer tube having a cross-section of substantially constant diameter, l) said sleeve is provided with a longitudinal cavity and a recess formed on a bottom wall of said cavity, m) said thrusting slider is housed in said longitudinal cavity and is retained radially by said outer tube, n) said thrusting slider is provided with at least one first slot, and p) said resilient means are housed in said first slot of said thrusting slider and engage said recess of said sleeve. 2. Telescopic extension according to Claim 1, characterized in that said lateral opening of said outer tube extends as far as one end thereof and said sleeve has an external longitudinal projection which engages said opening so as to couple said outer tube with said sleeve and centre said outer tube with respect to said sleeve. 3. Telescopic extension according to Claims 1 and 2, characterized in that said lateral opening of said outer tube has dimensions such as to make accessible said thrusting slider housed in said longitudinal cavity of said sleeve. 4. Telescopic extension according to Claim 1, characterized in that said thrusting slider is also provided with at least one second slot designed to receive said first constraining means) when said slider moves longitudinally, in a first direction, and said first constraining means moves radially and comes out of said first notch of said inner tube. 5. Telescopic extension according to Claim 4, characterized in that said second slot has an inclined side which is designed to exert a radial thrust on said first constraining means. 6. Telescopic extension according to Claim 4, characterized in that it also comprises a second constraining means designed to engage <DP=3a second notch of said inner tube, said thrusting slider being provided with a third slot designed to receive said second constraining means when said slider moves longitudinally, in said first direction, and said second constraining means moves radially and comes out of said second notch of said inner tube. 7. Telescopic extension according to Claim 6, characterized in that said third slot has an inclined side which is designed to exert a radial thrust on said second constraining means. 8. Telescopic extension according to Claims 4 and 6, characterized in that said thrusting slider is provided with a fourth and a fifth slot which are designed to receive said first and said second constraining means, respectively, when said slider moves longitudinally, in the opposite direction to said first direction, and said first constraining means and said second constraining means move radially, respectively, and come out of said first and said second notch, respectively. 9. Telescopic extension according to Claim 8, characterized in that said fourth and fifth slot have a respective side inclined in the opposite direction to that of said sides of said second and third slot. 10. Telescopic extension according to Claim 1, characterized in that said thrusting slider is provided with a projecting, substantially perpendicular tongue. 11. Telescopic extension according to Claims 3 and 10, characterized in that said tongue of said thrusting slider projects from said lateral opening of said outer tube so as to engage said actuating means. 12. Telescopic extension according to Claim 11, characterized in that said tongue of said thrusting slider has undercuts and said actuating means consist of a pushbutton having a pocket provided <DP=4with additional undercuts which snap-engage said undercuts in said tongue. 13. Telescopic extension according to Claim 11, characterized in that said actuating means consist of a ring nut provided with a bayonet joint which engages said tongue of said thrusting slider and with a relief on said outer tube so as to lock together said ring nut and said slider for the longitudinal movements and allow said ring nut to move longitudinally with respect to said outer tube. 14. Telescopic extension according to Claim 2, characterized in that said sleeve is provided with a collar against which said end of said outer tube comes into abutment, said collar and said external projection having a thickness substantially equal to that of said outer tube such that it remains flush with said collar and said external projection. 15. Telescopic extension according to Claim 1, characterized in that said sleeve has an internal longitudinal overhang and said inner tube has a longitudinal groove with which said internal longitudinal overhang of said sleeve engages so as to centre said sleeve with respect to said inner tube. 16. Telescopic extension according to Claim 15, characterized in that said longitudinal groove has a bottom wall provided with said notches, and said internal longitudinal overhang of said sleeve, which engages with said groove, is arranged underneath said longitudinal cavity which houses said thrusting slider.