JPS6324859Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pipe connection device for a vacuum cleaner.

In a vacuum cleaner, one end of the suction hose is connected to the suction port of the dust case, an extension pipe is fitted to the bent pipe formed at the other end, and the connecting pipe of the suction port body is fitted to the extension pipe for cleaning. However, the fitting parts of each part must be smooth to ensure smooth air circulation, and each pipe is blow molded for cost reasons, so the diameter varies depending on molding conditions. Therefore, it is difficult for the fitting circumferential surfaces of each part to fit tightly over a wide area, and it is easy to come off during use. It also has the disadvantage of being prone to leaks.

This idea was made in view of these points, and it has a simple structure that can fit pipe bodies such as the bent pipe of the suction hose, the extension pipe, and the connecting pipe of the suction port body while preventing them from coming off. The purpose is to provide pipe connection devices for machines.

This device has an outer tube formed with a tapered elastic outer end whose inner diameter gradually increases toward the end, and an outer circumference that is within an allowable range for insertion into the outer end. an inner tubular body formed with a tapered elastic inner end whose outer diameter gradually decreases toward the end; the inner circumferential surface of the outer end and the inner tube One of the outer circumferential surfaces has an elliptical cross-sectional shape, and the other has a circular cross-sectional shape. Therefore, an elastic force is applied to the fitting circumferential surface between the outer end and the inner end to restore the shape from a circular shape to an elliptical shape or from an elliptical shape to a circular shape. It is designed to ensure that it does not come off from the body, and has a simple structure for this purpose.

A first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. First, a curved pipe 1, which is an inner pipe body, an extension pipe 2, which is an outer pipe body, an extension pipe 3, which is an outer pipe body, and a connecting pipe 4, which is an inner pipe body, are provided. The curved pipe 1 is connected to one end of a suction hose 5,
The connecting pipe 4 is rotatably fitted and held in the suction port body 6. The extension pipes 2, 3 are fitted together so that they can expand and contract by loosening the fastening ring 7, and the inner insertion end 8 formed at the end of the bent pipe 1 is fitted into the outer insertion end 9 formed at the end of the extension pipe 2, and the inner insertion end (not shown) formed at the end of the connecting pipe 4 is also fitted into the outer insertion end 9 formed at the end of the extension pipe 3.
The connecting means by the above may be used as a connecting means between the extension pipes 2 and 3.

The inner insertion end 8 has a tapered shape with a diameter decreasing toward the end, and the outer insertion end 9 has a tapered shape with a diameter increasing toward the end. As shown in FIG. 3, the circumferential lengths of both are determined so that they fit into each other. That is, the third
For example, FIG. 4 shows a cross-sectional view taken along line A-A in the figure, and the outer end 9 has a circular cross-sectional shape and an inner diameter of D, while the inner end 8 has an elliptical cross-sectional shape. The outer diameter is defined as the major axis Dx and the minor axis Dy. Although D is larger than Dy and smaller than Dx, the circumferential lengths of the outer end 9 and the inner end 8 in the same cross section are approximately equal so that they fit into each other.

In such a configuration, when the inner end 8 is fitted to the inner periphery of the outer end 9 while reducing its major axis Dx, the inner end 8 is fitted onto the inner circumference of the outer end 9. An elastic force acts on the fitting circumferential surface, which attempts to restore the nearly circular shape to an elliptical shape due to pressure. Therefore,
The outer end 9 and the inner end 8 are reliably prevented from coming off, and leakage of the suction airflow can be prevented. The structure is simple, as either the outer end 9 or the inner end 8 may be made into an elliptical shape, and molding is also easy.

Note that one side is oval and the other is circular.
The term ``circular'' does not mean a perfect circle, and variations in molding are included in the circular shape. Major axis Dx and minor axis
The dimensional difference from Dy is also arbitrarily determined within a range where a desired force is applied to restore the fitting peripheral surface from a circular shape to an elliptical shape.

Next, a second embodiment of this invention will be explained based on FIGS. 5 and 6. Components that are the same as those in the previous embodiment are designated by the same reference numerals, and description thereof will be omitted. The inner diameter D of the outer end 9 and the longer diameter Dx of the outer diameter of the inner end 8
and short diameter Dy are the cross-sectional dimensions of the same part,
The relationship between size is as described above. In this embodiment, a recess 10 is formed on the inner circumferential surface of the insertion end 8.

Therefore, the oval inner end 8 is inserted into the outer end 9 while being deformed into a circular shape, but the inner end 8 has improved flexibility due to the formation of the recess 10, and the inner end 8 The outer circumferential surface of the outer circumferential surface easily conforms to the inner circumferential surface of the extrapolated end portion 9,
Airtightness is further improved.

As described above, this device includes an outer tube body formed with a tapered elastic outer end portion whose inner diameter gradually increases toward the end, and a length of the outer circumference that is inserted into the outer end portion. an inner tubular body formed with a tapered elastic inner end whose outer diameter gradually decreases toward the end within a permissible range; One of the outer peripheral surfaces of the inner end has an elliptical cross-sectional shape and the other has a circular cross-sectional shape, so the mating peripheral surface between the outer end and the inner end has a circular to oval or A device that applies an elastic force that attempts to restore the oval shape to a circular shape, thereby ensuring that the outer tube body and the inner tube body do not come off, and has the effect of having a simple structure for this purpose. It is.

[Brief explanation of the drawing]

Figure 1 shows the first embodiment of this invention, a side view showing the whole in a reduced size, Figure 2 is a partially exploded perspective view showing the outer and inner ends, and Figure 2 is a partially exploded perspective view showing the outer and inner ends of the first embodiment. 3
The figure is a cross-sectional view showing the fitted state of the outer end and the inner end, and FIG. FIG. 5 is an exploded perspective view of the outer and inner ends of the second embodiment of this invention, and FIG. 6 is the outer end thereof. and FIG. 6 is an enlarged cross-sectional view of the same portion of the insertion end. 1...Bent tube (inner tube body), 2...Extension tube (outer tube body), 3...Extension tube (outer tube body), 4...Connection tube (inner tube body), 8...Insertion end Part 9...Extrapolation end.

Claims (1)

[Scope of utility model registration request] an outer tubular body formed with a tapered elastic outer end whose inner diameter gradually increases toward the end; an inner tubular body formed with a tapered elastic insertion end whose outer diameter gradually decreases toward the end; A pipe connection device for a vacuum cleaner, characterized in that one of the two has an oval cross-sectional shape and the other has a circular cross-sectional shape.