JPS6334616Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a connection joint for an extension pipe of a vacuum cleaner.

Configuration of the conventional example and its problems The conventional example is explained with reference to Figs. 1 and 2.
2 is a vacuum cleaner main body, 2 is a flexible hose, 3 is an upward extension tube, 4 is a downward extension tube, and 5 is a suction tool.

The end 6 of the upper extension tube 3 is widened into a tapered shape, and a screw tube 7 is adhesively fixed thereto.

A packing 8 having a tapered end is fitted between this tapered portion and the downward extension tube 4. The packing 8 is fitted through a groove 10 to a nut 9 which is screwed into the threaded cylinder 7.

With this configuration, when the nut 9 is rotated, the packing 8 enters the tapered part 6 of the upper extension tube 3,
Tighten the lower extension tube 4, and then tighten the upper and lower extension tubes 3, 4.
is fixed.

However, this configuration has the following drawbacks.

When the upper and lower extension tubes are separated, the threaded tube 7 is exposed and is likely to be damaged when subjected to impact.

If the extension tube is made of metal, it is difficult to bond it.

After bonding, it is generally necessary to leave the adhesive in a well-ventilated place until the solvent evaporates, making it unsuitable for mass production. There are also cases in which the screw is integrally formed with the extension tube, but in this case, when the extension tube is made of synthetic resin, the wall thickness of the part corresponding to the valley of the screw is thinner, making it easier to use. Damage occurred.

Purpose of the invention This invention solves the problems of the above conventional example.
It is an object of the present invention to provide a connecting joint for an extension pipe that has good productivity and is strong against impact.

Structure of the invention The pipe connecting joint of the invention expands the end of an upwardly extending pipe to form an expanded part with a square hole, and a ring that matches the expanded part and has a square projection with a screw on the outside. It is placed inside the upper extension tube,
The ring can be securely fixed without adhesive, and it is also strong against impact.

DESCRIPTION OF EMBODIMENTS The embodiment will be described below with reference to FIGS. 3 and 4.

The end of the upward extension pipe 11 of the vacuum cleaner is expanded to have a first expanded part 12, and three square holes 13 are provided in this part. The end surface of the extension tube 11 is further expanded into a tapered shape to form a second expanded tube portion 14 . The first expanded pipe section 12
A ring 16 having a groove 15 is installed inside. A square projection 17 corresponding to the three square holes 13 of the upper extension tube 11 is provided on the outside of the ring 16, and a screw 18 is provided on the outer periphery of the projection 17. A flange 21 is provided on the inside of the nut 19 on the opposite side of the thread 20 which is engaged with the thread 18 on the outer periphery of the ring 16. It is adapted to fit into the tapered second expanded tube portion 14 of the upper extension tube 11 . A lower extension tube 25 is fitted inside the upper extension tube 11 and packing 23, and the ring 1
It is also in sliding contact with the inner circumference of 6.

In the above configuration, the screw 1 is attached to the upper extension tube 11.
8, use the groove 15 of the ring 16 to make the diameter smaller, insert it into the first enlarged tube part 12 of the upper extension tube 11, and connect the square hole 13 of the ring 16 with the ring 16. It is sufficient to simply match the square projections 17. After that, the lower extension tube 25 is inserted, and the nut 19 combined with the packing 23 is screwed into the screw 18 on the outer periphery of the ring 16 and tightened, so that the tapered part 24 of the packing 23 becomes the second expanded tube of the upper extension tube 11. The inner surface of the packing 23 tightens and fixes the downward extension tube 25.

Effects of the invention As is clear from the above embodiments, the present invention expands one end of the extension tube, fits a protrusion into the square hole provided here to prevent rotation, and attaches a screw around the outer periphery of the ring that prevents it from coming off. It is possible to provide a reliable connection joint for an extension pipe by the simple means of forming. Since the ring with the screw is located inside the extension tube, the ring will not break due to impact even when the nut is removed. Moreover, since no adhesion is required, it can be used with metal extension tubes and can be put to use immediately after assembly, which is of great practical value.

[Brief explanation of the drawing]

Fig. 1 is a side view of a vacuum cleaner, Fig. 2 is a sectional view of a pipe connecting joint of a conventional extension pipe, Fig. 3 is a side sectional view of a pipe connecting joint showing an embodiment of the present invention, and Fig. 4 is a sectional view of a pipe connecting joint of a conventional extension pipe. The figure is a front sectional view taken along the line AA in FIG. 3. 11...Upward extension tube, 12...First tube expansion part,
13... Square hole, 14... Second tube expansion part, 16...
Ring, 17... Square projection, 18... Screw, 19
...Natsuto, 23...Patsuking, 25...Downward extension tube.

Claims (1)

[Scope of utility model registration request] The upper end of the downward extension tube into which the upward extension tube is inserted is expanded, and the end surface thereof is further expanded into a tapered shape to form first and second expanded tube portions, and the first expanded tube portion is provided with the same. A plurality of square holes provided in the first tube expansion part are penetrated from the inside to the outside, and a ring having a plurality of square protrusions formed with threads on the outer periphery is installed inside, and the ring is fitted into the second tube expansion taper part. A pipe connecting joint for a vacuum cleaner, in which a packing having a matching taper part is fitted onto an upper extension pipe, and a nut, which is locked and fitted into the packing, is removably screwed into the threaded tube.