Telescopic tube for electric vacuum cleaner

Abstract

To prevent the breaking of expansion springs by providing a first and a second sleeves, which are stored in an inner and outer pipe, respectively and slidably inserted therein mutually in a wiring mechanism, and storing the expansion spring connected to a terminal of one pipe end. An expansion pipe is formed of an outer pipe connected to a vacuum cleaner main body side, a coupling member connected to a power brush side of a suction means, and an inner pipe 2 for connecting them to each other. A storing part 8 for storing a wiring mechanism including a pair of expansion springs 10, 11 which feed power supply to the power brush is formed in the inner pipe 2. The respective expansion springs 10, 11 have the diameter smaller than the internal diameter of a cylindrical part provided in a sleeve 16, which is inserted in the storing part 8, have the both ends formed into tapered states, and have lead wires 14, 15 connected to the respective ends. The central parts of the expansion springs 10, 11 are formed into the large diameters matching the internal diameters of the cylindrical parts of the sleeves 12, 13 so that the spring load can be reduced.

Description

【Technical Field】 [0001] The present invention relates to a telescopic tube of an electric vacuum cleaner which is interposed between a tube installation port of an electric vacuum cleaner body and a power brush for suction. 【Background technique】 [0002] As is well known in the prior art, as a telescopic tube of an electric vacuum cleaner equipped with an electric brush for suction, an inner tube is freely provided in and out of the outer tube, and the length of the inner tube protruding from the outer tube is adjusted to lock the telescopic tube. [0003] In this conventional device, the wiring mechanism for the power supply used to drive the electric brush can be constructed using a retractable spring whose length can be changed as the inner tube goes in and out of the outer tube. [0004] However, in such a conventional device, when the wiring mechanism expands and contracts, a force is applied to the connecting portion between the both ends of the wiring mechanism and the p...

AI Technical Summary

Problems solved by technology

[0004] However, in this conventional device, when the wiring mechanism expands and contracts, a force is applied to the connecting portion between both ends of the wiring mechanism and the power lead, and there is a problem that the connecting portion is easily damaged.

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