JPH0795992B2 - Vacuum cleaner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vacuum cleaner used at home, and particularly to an extension tube thereof.

2. Description of the Related Art Conventionally, an extension tube of an electric vacuum cleaner of this type is disclosed in, for example, Japanese Patent Laid-Open No.
As shown in Japanese Patent Publication No. 90, the structure was as shown in FIGS.

That is, the connection structure of the tip pipe 3 of the flexible hose 2 connected to the main body 1 of the conventional electric vacuum cleaner and the extension pipe 5 which is expandable or retractable for replacing the floor nozzle 4 and other various attachments, or the extension pipe 5 of three or three joints is the same. The fitting surfaces of the pipes 6, 7 are formed in a tapered shape, and the fitting portions of the pipes 6, 7 are formed in a polygonal shape so that the pipes 6, 7 can be connected or separated.

Further, conventionally, this type of extension pipe 5 has been formed by extrusion molding of hard PVC.

However, in the case of such a structure, since the inscribed fitting portion 6 of the pipes 6 and 7 is formed in a polygonal shape, if the number of polygons is large, the circumference is inscribed. Since the circumference of the cylinder of the fitting 7 is almost the same, the fitting cannot easily absorb the dimension due to the deformation of the polygon, and the fitting is easy to come off and difficult to come off.
Further, in particular, since the extension pipes 6 and 7 are conventionally formed by extrusion molding of hard PVC, the polygonal deformation is very small.

Further, if the number of polygons is too small, there is a risk that a gap is created between the outer fitting portion 6 and the inner fitting portion 7, air leaks from the gap and suction performance is deteriorated.

Further, the dimensional tolerances of the inner and outer diameters are very severe, resulting in a high process defect rate, which lowers the productivity.

Therefore, the first object of the present invention is to prevent air leakage, facilitate the attachment and detachment of pipes, and widen the dimensional tolerance of the inner and outer diameters of pipes to reduce the defective rate of the process and improve the productivity. I am trying.

The second purpose is that even if the fitting portion of the pipe varies in the lengthwise direction of the extension pipe, the tip of the fitting portion can be expanded and contracted to absorb the variation and facilitate the attachment and detachment of the pipes. It is the one that is fitted.

Means for Solving the Problems In order to achieve the above first and second objects, the present invention is
Insert a tip pipe to the tip of the hose that communicates with the suction hole of the cleaner body, and insert it in the middle of the extension pipe that is inscribed in the fitting part of the extension pipes that are detachably connected to the tip pipe. In addition to forming a taper portion that increases in diameter toward the side, a plurality of protrusions that protrude inward are provided on the peripheral surface near the insertion port, and the inner diameter of the protrusions is the outer shape of the extension pipe for circumscribed fitting. Set smaller, the minimum diameter of the tapered part of the extension pipe to be fitted internally is set smaller than the diameter of the tip of the extension pipe to be fitted externally, and when each extension pipe is fitted, within the deformation range due to the protrusion The tip end of the extension pipe externally fitted is in contact with the taper portion.

Further, in order to achieve the second object, the distal end portion of the extension tube which is fitted externally is formed to be expandable and contractable in the insertion direction.

Action With the above configuration, the deformation of the inner diameter of the fitting portion of the extension pipe can be increased, so even if the outer diameter dimension or the inner diameter dimension of the inscribed fitting portion varies, it is possible to absorb the dimensional difference and achieve a fitting fit. it can.

In addition, the tip of the tip of the taper portion comes into contact with the taper portion to ensure air tightness and prevent air leakage.

Further, by making the tip of the fitting portion extendable, the fitting portion of the extension tube can be fitted properly even if the fitting portion varies in the long direction.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 3, 8 is a cleaner body having a built-in electric blower and a dust bag, and 9 is a connecting pipe 10 fixed to one end.
Is a flexible hose which is detachably connected to an air intake hole of a cleaner body, and a bent tip pipe 11 is rotatably connected to the other end. Further, extension pipes 12 and 13 are connected to the tip pipe 11 of the flexible hose 9 and a floor suction tool 14 is connected to the tip end thereof so that cleaning can be performed.

The fitting portion of the extension pipe 12 into which the one extension pipe 13 is inscribed and fitted
A plurality of protrusions 16 are formed in 12a symmetrically with respect to the parting line 15 of the mold, and when the extension tubes 12 and 13 are fitted to each other, the outer diameter of the circumscribing fitting portion 13a is the protrusion 16 described above. It abuts.

The extension tubes 12 and 13 are formed by PP blow molding.

Further, the tip portion 13b of the circumscribing fitting portion 13a of the extension pipe 13 is adapted to come into contact with the taper portion 12b provided on the inner wall 12c of the extension pipe 12 in which the inscribed fitting portion 12a is formed.

Further, the inner wall 12c of the extension pipe 12 having the inscribed fitting portion 12a is formed.
The height h of the plurality of protrusions 16 provided in the above is set to 0.3 mm or more.

Further, a plurality of grooves 17 are formed in the outer diameter of the tip end portion 13b of the extension tube 13 having the circumscribing fitting portion 13a so that the extension tube can be expanded and contracted in the longitudinal direction.

Next, the operation of the configuration of this embodiment will be described.

First, the plurality of protrusions 16 formed on the inner wall 12c of the extension pipe 12 having the inner fitting portion 12a and the outer diameter of the outer fitting portion 13a of the extension pipe 13 come into contact with each other. Since the inner diameter of the protruding portion 16 is smaller than the outer diameter of the outer fitting portion 13a of the outer fitting 13 for extension, the inner wall 12c of the inner fitting extension tube 12 is deformed.

At this time, even if the inner diameter of the extension pipe 12 or the outer diameter of the extension pipe 13 varies, the variation can be absorbed by the deformation of the inner wall 12c of the extension pipe 12.

Particularly, since the extension pipes 12 and 13 are formed by PP blow molding, they are flexible and easily deformed.

Therefore, the dimensional tolerance of the inner and outer diameters of the extension pipes 12 and 13 is ± 0.0
It was necessary to make it 5 mm, but in the extension tubes 12 and 13 of the present invention, ±
Since it can be expanded to 0.15 mm, it is possible to reduce the rate of process defects, improve productivity, and ensure a proper fit, and improve fitability.

Further, the tip 13b of the outer fitting portion 13a of the extension pipe 13 having the outer fitting portion is adapted to come into contact with the taper portion 12b of the inner fitting portion 13a, so that airtightness can be ensured. As a result, the suction performance of the vacuum cleaner can be prevented from lowering and the performance can be improved.

Further, the height of the protruding portion 16 formed on the inscribed fitting portion 12a is
If it is 0.3 mm or more, it is possible to absorb the variation in the inner and outer diameters of the extension tubes 12 and 13 and realize a proper fitting, thereby improving the fitting property.

Also, the outer contact fitting portion 13 of the extension pipe 13 having the outer contact fitting portion
Since a plurality of grooves 17 are formed on the outer diameter of the tip portion 13b of a, the extension tube 13 can be expanded and contracted in the longitudinal direction.

Therefore, even if the lengthwise dimension of the fitting portion 13a of the extension tube 13 varies, the tip portion 13b can be expanded and contracted to absorb the variation, and a proper fitting can be realized. Even in this case, the extension pipe 13 has a flexible P
-The effect formed by P is great.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to realize a proper fitting by absorbing the variation in the inner and outer diameters of the extension pipe, and to improve the connectivity and widen the dimensional tolerance. Therefore, it is possible to reduce the process defect rate and improve the productivity.

In addition, by making the tip of the extension pipe with the circumscribed fitting portion contact the taper portion provided on the extension pipe with the circumscribed fitting portion in advance, air tightness can be ensured, so that suction performance can be improved. Is. Furthermore, since the tip end of the extension tube with the circumscribing fitting part is expandable, it is possible to absorb the variation in the longitudinal dimension of the fitting part of the extension tube and improve the fitting property. is there.

[Brief description of drawings]

FIG. 1 is a side sectional view of an extension pipe in a fitted state according to an embodiment of the present invention, FIG. 2 is a front sectional view of the extension pipe, and FIG. 3 is an electric vacuum cleaner using the extension pipe. FIG. 4 is an external view of the conventional extension tube, and FIG. 5 is an external view of an electric vacuum cleaner using the conventional extension tube. 8 ... Vacuum cleaner body, 9 ... Hose, 11 ... Tip pipe,
12 …… Extension pipe with inward fitting, 13 …… Extension pipe with outer fitting, 16 …… Projection part.

Claims (2)

[Claims] 1. An extension pipe in which a tip pipe is connected to a tip of a hose communicating with an intake hole of a cleaner body, and a plurality of extension pipes that are detachably connected to the tip pipe are internally fitted. A taper portion that becomes larger in diameter toward the insertion side is formed in the middle of the, and a plurality of protrusions that protrude inward are provided on the peripheral surface near the insertion port. Set to be smaller than the outer shape of the extension pipe, the minimum diameter of the tapered portion of the extension pipe to be fitted internally is set to be smaller than the diameter of the tip of the extension pipe to be fitted externally, and the projection when each extension pipe is fitted. The electric vacuum cleaner configured such that the tip of the extension pipe externally fitted in the deformation range comes into contact with the tapered portion. 2. The electric vacuum cleaner according to claim 1, wherein a distal end portion of the extension tube which is externally fitted is formed so as to be expandable and contractable with respect to the insertion direction.