JPS6110609Y2 - - Google Patents

Description

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

Generally, in a vacuum cleaner, a telescopic tube is interposed between the vacuum cleaner body and the suction port to maintain the height of the hand portion at a high position during cleaning. The telescopic tube is formed by a large diameter tube and a small diameter tube that fit into each other in the axial direction. Comparatively high-grade telescopic tubes have a fixing means using a tightening ring so that the length of the telescopic tube can be set to an arbitrary length. However, this fixing means using a tightening ring has a problem in that its structure is complicated and it is difficult to manufacture.

On the other hand, a simple expandable tube is equipped with a locking mechanism that locks the axial movement of the large diameter tube and the small diameter tube only when the tube is expanded.
This structure is adopted to maintain a constant height of the handle when in use, and there is no need to lock the large diameter pipe and small diameter pipe when not in use, so in that sense it is a reasonable structure. It is.

However, the manner in which it is used in cleaning is extremely complicated, and even a simple telescopic tube may be used in a contracted state. In such cases, conventional devices are not fixed, making them extremely difficult to use, and do not take into account the maintenance of airtightness, which poses functional problems.

This invention was made in view of the above points, and an object is to obtain a pipe connection device for a vacuum cleaner that can be locked even in a contracted state in a simple telescopic pipe that can be locked only in an extended state. The purpose is to

This idea connects the suction path from the suction port of the vacuum cleaner body to the suction device that connects to the floor with a telescopic pipe formed by telescopically fitting a large diameter pipe and a small diameter pipe. formed with other connecting pipes,
A locking mechanism is provided for fixing the positions of both the large diameter pipe and the small diameter pipe only when the telescopic pipe is in the extended state, wherein the large diameter pipe and the small diameter pipe are fixed in the axial direction when the large diameter pipe and the small diameter pipe are in the contracted state. are formed with end portions that overlap with each other, and a fitting circumferential surface is formed at one end of the connecting tube so that both the inner and outer circumferences are press-fitted to the end portions of the large-diameter tube and the small-diameter tube. It is something to do. Therefore, by simply connecting the connecting tube to the mutually overlapping ends of the large-diameter tube and the small-diameter tube while the telescopic tube is contracted, the fitting circumferential surface of the connecting tube can be connected to the end of the large-diameter tube. Because it fits together with the end of the small diameter pipe, the axial movement of the large diameter pipe and the small diameter pipe is fixed, and the fitting circumferential surface of the connecting pipe is tightly attached to each end surface to ensure airtightness of both ends. As a result, it is reliably maintained, and even when a simple telescopic tube is used, it can be locked in two modes: an expanded and contracted state and a contracted state.

An embodiment of this invention will be described based on the drawings. Reference numeral 1 denotes a vacuum cleaner body, and a flexible hose 3, which is a connecting pipe, is connected to a suction port 2, which is the entrance of a dust collection chamber maintained at negative pressure, and a bent pipe 4 formed at the end of the flexible hose 3 A telescopic pipe 5 is connected to the pipe 5, and a suction tool 6 that is connected to the floor is connected to the end of the pipe 5. Telescopic tube 5
First, there is an outer insertion end 7 into which the suction tool 6 is inserted.
is formed to be expanded, and the expanded portion 8 is formed at the rear end.
A small-diameter tube 10 is provided with an inner insertion end 9 that tapers gently from the top, and the small-diameter tube 10 is inserted from the tip of the large-diameter tube 11 to form the large-diameter tube 1.
A ring 12 is fitted and fixed to the tip of the tube 1 to abut against the outer end 7 and the expanded portion 8 to prevent the small diameter tube 10 from coming off. An annular groove 13 is formed in the enlarged portion 8 of the small diameter pipe 10, and this annular groove 13
A locking mechanism 16 consisting of a band 14 made of a metal material that elastically contracts and expands in diameter and a protrusion 15 erected on the band 14 is fitted into the locking mechanism 16 . The protrusion 15 of the locking mechanism 16 is made to protrude from the outer periphery of the expanded portion 8 of the small diameter pipe 10 and the outer periphery of the tip end of the large diameter pipe 11 so as to coincide with each other when the small diameter pipe 10 and the large diameter pipe 11 are extended. A hole 17 is formed. Further, at the rear end of the large-diameter tube 11, an outer insertion end 18 is formed which overlaps the insertion end 9 during contraction, and has a taper that widens toward the end. The bent pipe 4 of the flexible hose 3 has a fitting circumferential surface 19 that fits into the inner circumference of the outer end 18 of the large diameter pipe 11 and an outer circumference of the inner end 9 of the small diameter pipe 10. A fitting circumferential surface 20 to be fitted is formed, and these fitting circumferential surfaces 19,
20 has annular recesses 21, 21 formed therein.

In such a configuration, when the telescopic tube 5 is expanded as shown in FIG. Fix directional movement. The fitting peripheral surface 19 of the bent pipe 4 is the large diameter pipe 1
It is used by fitting into the outer insertion end 18 of 1. In this state, when the extensible tube 5 is contracted while pressing the protrusion 15, the inserted end of the small diameter tube 10 is press-fitted into the fitting circumferential surface 20 of the bent tube 4. In this contracted state, the two surfaces of the fitting peripheral surfaces 19 and 20 are the outer insertion end 18 and the inner insertion end 9.
The airtightness is improved by press-fitting the tube into
It can suck up dirt in a vertically small state. In addition, when it is reduced when not in use, the small diameter pipe 10 and the large diameter pipe 1
1 overlap over almost the entire length in the axial direction, so even though the length when expanded is large, the length when contracted is short, and the space required for storage and storage is small.

In addition, when using the extension tube 5 in an enlarged manner, the fitting peripheral surface 19 of the bent tube 4 of the flexible hose 3 is connected to the large diameter tube 1.
In the above description, the fitting circumferential surface 20, which becomes the inner surface of the bent pipe 4, may be fitted to the inner circumference of the outer end 18 of the small diameter pipe 10. good.

The fitting peripheral surfaces 19 and 20 are press-fitted with a taper, and furthermore, the fitting peripheral surfaces 19 and 20 are press-fitted with a taper.
Even if a slight error occurs in the roundness or dimensions of the air conditioner and a ventilation effect occurs, the existence of the recesses 21, 21 causes a labyrinth effect, which increases the ventilation resistance, thereby making it possible to alleviate leakage.

Since this device is constructed as described above, it can be used to fit the connecting pipe to the inner periphery of the large diameter pipe and lock the telescoping pipe in the extended state using the lock mechanism for cleaning, and to fit the connecting pipe to the inner periphery of the large diameter pipe. It can be press-fitted to the outer periphery of a small-diameter pipe, and the fitting force locks the telescopic pipe in the contracted state, and the pipe can be cleaned with a good connection. In the type of telescopic tube, it is possible to improve its function by adding a lock in the contracted state.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view, Figure 2 is an enlarged vertical cross-sectional side view of a part of the state in which the connecting pipe is connected to the telescopic pipe in the contracted state, and Figure 3 is the state in which the connecting pipe is connected to the telescopic pipe in the expanded state. 4th longitudinal cross-sectional side view showing an enlarged view of
The figure is a perspective view of the locking mechanism. 1...Vacuum cleaner body, 2...Suction port, 3...Flexible hose (connection pipe), 5...Extendable pipe, 6...Suction tool, 10...Small diameter pipe, 11...Large tube, 16 ……
Lock mechanism, 19-20... fitting peripheral surface.

Claims (1)

[Scope of utility model registration request] The suction path from the suction port of the vacuum cleaner body to the suction device connected to the floor is formed by a telescopic tube that is formed by telescopically fitting a large diameter pipe and a small diameter pipe, and other connections connected to this telescopic pipe. and a locking mechanism that fixes the positions of both the large diameter pipe and the small diameter pipe only when the telescopic pipe is in an expanded state, wherein the large diameter pipe and the small diameter pipe are forming end portions that overlap each other in the axial direction in the contracted state, and having a fitting peripheral surface at one end of the connecting tube that is press-fitted to the end portions of the large diameter pipe and the small diameter pipe in a press-fit state on both the inner and outer circumferences. A pipe connection device for a vacuum cleaner, characterized in that: