JPH04189337A - Extension tube of vacuum cleaner - Google Patents

Abstract

PURPOSE:To eliminate the danger such as an electric shock, ignition, etc., of an electric connecting part, and also, to make it possible to execute the conduction in the whole area of expansion/contraction length by constituting an electric conductor of a flexible core wire, a band-like wire of a copper compound for surrounding it spirally, and also, a flexible insulating tube for covering them. CONSTITUTION:As for length of an extension tube main body 9, a small tightening ring 19 is tightened to the tapered face 23 of a large diameter extension tube 17 by rotating a large tightening ring 21 so that the length can be adjusted freely in accordance with a state without disconnecting power source supply to a driving source of a suction implement 7. Also, in the inside peripheral part of the large diameter extension tube 17 and a small diameter extension tube 18 which are flexible, an electric conductor 28 consisting of a core wire 25 consisting of a flexible material of a urethane compound, a band-like wire 26 of a copper compound for surrounding spirally this outside periphery, and also, a flexible insulating tube 27 of a urethane compound for covering them, are placed. In such a state, at the time of cleaning on a carpet, etc., to a rotary brush contained in the suction implement 7, and the driving source contained in the suction implement 7 in the same way, a power source is supplied from an electric wire contained in a hose 5 through the electric conductor 28 placed on the inside peripheral surface of the flexible extension tube main body 9, and the rotary brush is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an extension tube for a vacuum cleaner, and particularly to an extension tube used between a vacuum cleaner body and a suction tool.

This invention relates to improvements in electrical conductors.

Conventional technology Conventionally, in a vacuum cleaner in which a suction device is detachably connected to the main body of a vacuum cleaner via an extension tube, power is supplied to the drive source that drives the rotating brush built into the suction device from the inner circumference or outer circumference of the extension tube. Generally, this is done using electric wires installed on the surface, but as described in JP-A-1-310626, extension tubes of different diameters are arranged so as to be slidable, and the outer peripheral surface of the small diameter extension tube body and Sources of stains are supplied by arranging electrical contacts on the inner peripheral surface of the large-diameter extension tube body that are connected to the electric wires in the extension tube bodies, respectively, and that come into contact with each other when at least both extension tube bodies are extended. There is something that does this.

Problems to be Solved by the Invention However, as shown above, in a device in which electrical connection is made between a contact provided on the outer peripheral surface of a small diameter extension tube body and a contact provided on the inner peripheral surface of a large diameter extension tube, When the extension tube main body is retracted, fine dust enters the large-diameter and small-diameter extension tubes, and there is a risk that three pages of microscopic dust will accumulate at the contact points, resulting in poor contact between the wires.

In addition, if fine dust from conductive materials such as carbon is attracted during normal use, the conductive materials will adhere to the inside of the extension tube, creating a short-circuit between the contacts and creating a risk of fire due to Sinupark.

Furthermore, if you try to conduct the electric wire with the full extension width of the extendable extension tube, you will need a protective cover for each contact to prevent the contacts installed in the small diameter extension tube from being exposed to the outside. Then comes the cost aspect.

This was a major disadvantage in terms of quality.

The present invention has been made to solve these conventional problems, and aims to provide an extension tube for a vacuum cleaner that eliminates the risk of electric shock and ignition at electrical connections and can conduct electricity throughout the entire length of the extension. It is.

Means for Solving the Problems To achieve the above object, the extension tube of the vacuum cleaner of the present invention includes a conductor that is expandable and retractable in the direction of expansion and contraction of the extension tube body near the outer peripheral surface or inner peripheral surface of the extension tube body. One is to connect the conductor to a stretchable core wire, a copper-based strip wire spirally surrounding the core wire, and a copper-based strip wire that further covers these. By constructing it with a stretchable insulating tube, it is possible to supply power over the full stretch width without exposing the current-carrying part to the outside.

Furthermore, a plurality of exposed portions are formed on the inner or outer circumferential surface of an extension tube that is slidable in the radial direction, and have conductors inside which are made of a spring body made of thin bronze. There is no risk of fire, electric shock, etc.

Function: With this configuration, the vacuum cleaner extension tube of the present invention is capable of disposing a stretchable conductor near the inner peripheral surface or outer peripheral surface of the stretchable extension tube body, and the extension tube extends over the entire length of the vacuum cleaner body. This means that power can be supplied to the drive source for the rotating brush built into the suction device.

In addition, a conductor with a stretchable core wire, a copper band wire spirally surrounding it, a conductor with a stretchable edge tube covering these wires, and an extension tube extending parallel to the sliding direction. By arranging a plurality of slidable protective tubes with spring conductors made of spring bronze inside on the inner or outer circumferential surface of the tube, the conductive part is always connected to the insulated tube or protective tube. It will be covered with a tube.

Embodiment Hereinafter, an extension tube for a vacuum cleaner according to an embodiment of the present invention will be explained based on the accompanying drawings. In Fig. 2, an electric blower (not shown) for suctioning dust is placed at the rear of the main body 1 of the vacuum cleaner, which has a dust collection chamber inside. It is designed to remove the source of stains. Further, a dust cover 3 is provided at the front of the main body 1 so as to be openable and closable, and a hose 5 and a hand/L/6 are also provided via a detachable connecting pipe 4. Further, an electric contact 8 for supplying power to the main body 1, the hand handle 6, and the suction tool 7 is arranged on the connecting pipe 4. Hand at hand) V6
The extension tube main body 9 is removably engaged at the tip thereof, and electrical contacts 6 and \-7 (not shown) for power supply similar to those described above are provided and held with a buckle 10.

Furthermore, the suction device 7 is removably engaged at the tip of the extension tube main body 9 via a connecting tube 11, and an electric contact (not shown) for power supply similar to that described above is provided, which is held with a buckle 12. There is. Although not shown, a rotating brush (not shown) electrically rotated by a drive source is placed inside the suction tool 7.

Reference numeral 13 denotes a control part provided on the hand hand/I/6 for starting and stopping the electric blower (not shown) and the rotating brush (not shown) built into the suction tool 7.

Next, the extension tube main body 9 will be explained. The extension tube main body 9 consists of a large diameter extension tube 14 and a small diameter extension tube 16, and the small diameter extension tube 16 can be freely slid inside the large diameter extension tube 14 in the direction indicated by the arrow. The extension tube main body 9 is held and fixed at various lengths by a fixed tube 16 provided at the tip of the large diameter extension tube 14.

Next, the structure of the extension tube main body 9 will be explained with reference to FIG.

7 In the vane diagram, 17 is a large-diameter extension tube, and 18 is a small-diameter extension tube. Extension tube 18
The large diameter extension tube 17 is fitted between the tapered surface 2o provided on the end surface of the ring 19 for small tightening and the tapered surface 22 provided on the inner circumferential surface of the ring 21 for large tightening. In addition to arranging the tapered surface 23 on the end surface, the ring 19 is used for small tightening.
A threaded portion 24 is provided between the outer peripheral surface and the inner peripheral surface of the ring 21 for large tightening, and for large tightening, rotate ring 21 in the circumferential direction. It moves in direction B and tightens the tapered surface 23 of the large diameter extension tube 17.

The inner peripheries of the expandable large-diameter extension tube 17 and the small-diameter extension tube 18 are provided with a core wire 2 made of an expandable urethane material.
6, a copper-based strip wire 26 spirally surrounding the outer periphery, and a conductor 28 consisting of a stretchable urethane-based insulating tube 27 covering these wires, and both ends of the conductor 28 are arranged. A contact portion 29 for electrically connecting to the suction tool 7 and a contact portion 30 for connecting to the hand hand lV6 are integrally provided in each of the suction devices.

In addition, as shown in FIG. 3, on the inner circumferential surfaces of the large diameter extension tube 17 and the small diameter extension tube 18, which can be expanded and contracted as well as held and fixed as described above,
A spring body 31 made of phosphor bronze for spring use, a small protection tube 32 containing the spring body 31 that can slide freely against each other, and a large protection tube 33.
At the same time, the suction tool 7
and can be detachably attached to the hand hose 6.

Next, the function of the extension tube main body 9 will be explained with reference to FIGS. 1 and 3.

As explained in FIG. 2, the extension tube main body 9 has a hose hand/I/6 and a suction tool 7 connected to both ends thereof, and a rotary brush built into the suction tool 7 is used when cleaning a carpet. (not shown), a drive source (not shown) also built inside the suction device 7 is built into the hose 5 via a conductor 28 arranged on the inner peripheral surface of the extendable and contractible extension tube body 9. It is a 9-page book that is powered by electric wires that rotate a rotating brush.

Further, as shown in FIG. 3, in the case of a conductor made of a copper-based strip wire 31, the power built in the hose 5 is similarly supplied to the drive source in the suction tool 7.

In the above configuration, the length of the extension tube main body 9 is the same as that of the suction tool 7.
Large tightening can be achieved by rotating the ring 21 so that the user can freely adjust the length according to the height of the user and the place to be cleaned (for example, stairs) without cutting off the power supply to the drive source. The small tightening allows adjusting the tightening of the ring 19 to the tapered surface 23 of the large diameter extension tube 17.

Effects of the Invention As is clear from the above description of the embodiments, the vacuum cleaner extension tube of the present invention has the following advantages due to the arrangement of the expandable conductor on the inner circumference of the expandable extension tube body. It has an effect like this.

First, even if the length of the extension tube body is changed depending on the usage situation, the electric conductor is expandable and retractable, so there is no possibility that the power supply to the drive source of the suction tool will be cut off.

Another is that by covering the stretchable spiral strip wire with a stretchable cladding tube, even if conductive materials such as carbon are sucked in when dust is sucked, there is a risk of short-circuiting between power supplies or fire. There is no such thing.

Another advantage is that by forming the conductor for power supply with the spring body made of spring bronze, it maintains conductivity even if the extension tube body is left fully extended for a long period of time. This allows the tube to maintain an appropriate length without causing the body to stretch.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the main part of the extension pipe body of a vacuum cleaner according to an embodiment of the present invention, Fig. 2 is a perspective view showing the overall structure of the vacuum cleaner, and Fig. 3 is a similar embodiment of the vacuum cleaner. It is a side view which shows the principal part of the extension tube main body which shows an example. 9...Extension tube body, 1...Large diameter extension tube, 18...Small diameter extension tube, 25...Core wire, 26...・Strip wire, 27...Insulating tube, 28...Conductor, 31...Spring body,
32...Small protection tube, 33...Large protection tube.

Claims (2)

[Claims] (1) A plurality of tubular extension tube bodies with different diameters are automatically slidably connected in the radial direction, and a stretchable conductor is arranged in the longitudinal direction near the inner peripheral surface or outer peripheral surface of the extension tube body, The electric conductor is an extension tube for a vacuum cleaner, which is made up of a stretchable core wire, a copper strip wire surrounding the core wire in a spiral manner, and a stretchable insulating tube covering these wires. (2) A plurality of extension tubes that are slidable in a plurality of radial directions, each having a spring conductor made of phosphor bronze built-in in the longitudinal direction near the inner peripheral surface or outer peripheral surface of the extension tube. 2. The extension tube for a vacuum cleaner according to claim 1, wherein the extension tube comprises a protection tube.