JPH08294472A - Expansible/contractible extension pipe of vacuum cleaner - Google Patents

Abstract

PURPOSE: To supply an expansible/contractible expansion pipe, which enables the fixation of an inner pipe without enlarging the diameter of the expansible/ contractible expansion pipe, by circumferentially rotating the inner pipe, pressing a press-fit protrusion in a press-fit groove, and thus, fixing the inner pipe. CONSTITUTION: The expansible/contractible expansion pipe is composed of an outer pipe and an inner pipe 3 which is freely drawably inserted in the outer pipe. A press-fit protrusion 12 pressed by and mated with a stopper 4, which is freely removably fitted to the outer pipe, is formed. A press-fit groove 9 is formed which has the press-fit protrusion 12 pressed, prevents the inner pipe 3 from being taken in and out, and fixes the inner pipe 3 by circumferentially rotating/moving the inner pipe 3 to its outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an outer pipe and an inner pipe which is inserted into and removed from the outer pipe. The inner pipe is pulled out from the outer pipe, and the inner pipe is pulled out at the pulled-out position. The present invention relates to a telescopic extension pipe of an electric vacuum cleaner that can be telescopically fixed.

[0002]

2. Description of the Related Art A telescopic extension pipe of a conventional vacuum cleaner will be described with reference to FIGS.

A telescopic extension pipe 21 of a conventional vacuum cleaner
Is composed of an outer pipe 22 and an inner pipe 23 that is inserted into and removed from the outer pipe 22. The inner pipe 23 is inserted into and removed from the end of the outer pipe 22 on the side where the inner pipe 23 is inserted. There was provided a stopper 24 for blocking the above and fixing the inner pipe 23.

The stopper 24 is formed in an annular shape having an operating portion 25 partially protruding outward so that the inner pipe 23 can be loosely inserted, and the stopper 24 is always provided inside the operating portion 25. The spring 26 that biases outward is provided.

Expansion and contraction extension pipe 2 of the electric vacuum cleaner having the above-mentioned structure
1 connects the suction hose connected to the cleaner body to one end of the outer pipe 22, and the inner pipe 2 of the expansion / contraction extension pipe 21.
Cleaning was performed by connecting the suction port to one end of No. 3. At this time, by pressing the operating portion 25 against the biasing force of the spring 26, the stopper 24 and the inner pipe 2
3, a gap is formed between the inner pipe 23 and the inner pipe 23 so that the inner pipe 23 can be freely taken in and out, and the inner pipe 23 is pulled out from the outer pipe 22 to an arbitrary position to adjust the length of the telescopic extension pipe 21. When the length of 21 reaches a desired length (a length suitable for cleaning), the operation unit 25
Release the pressure of. Then, the operation portion 25 is urged outward by the urging force of the spring 26, and the lower inner surface of the stopper 24 and the surface of the inner pipe 23 come into contact with each other to prevent the movement of the inner pipe 23. Telescopic extension pipe 2
The length of No. 1 is fixed, and the length of the expansion / contraction extension pipe 21 can be arbitrarily adjusted.

[0006]

In the case of the expansion / contraction extension pipe of the electric vacuum cleaner having the above structure, the stopper is urged outward by the spring and the inner pipe is fixed by the frictional force between the stopper and the inner pipe. Therefore, when cleaning, the suction port connected to the inner pipe of the expansion extension pipe hits the wall, etc., and if the impact force is larger than the friction force, the inner pipe moves into the outer pipe. There was a problem that the length of the expansion and contraction extension pipe was shortened because it got in and the usability deteriorated. Further, since there is no rotation stopper, the inner pipe rotates, the direction of the suction port changes, and usability deteriorates. Moreover, since the space for moving the stopper in the vertical direction and the wall of the inner pipe, the stopper, and the outer pipe are triple in the portion where the stopper is provided, the diameter of the pipe where the stopper is provided is There is a problem that the size becomes large and the operability deteriorates, and the number of parts increases.

The expansion / contraction extension pipe of the electric vacuum cleaner according to the present invention has been made in view of the above problems. A press-fitting protrusion is provided inside the outer pipe, and the inner pipe is rotated in the circumferential direction outside the inner pipe. By providing a press-fitting groove into which the engaging projection is press-fitted, and rotating the inner pipe in the circumferential direction to press-fit the press-fitting projection into the press-fitting groove to fix the inner pipe, thereby increasing the diameter of the expansion extension pipe. It is an object of the present invention to provide a telescopic extension pipe capable of fixing the inner pipe without the need.

[0008]

In order to achieve the above-mentioned object, a telescopic extension pipe of an electric vacuum cleaner according to claim 1 comprises an outer pipe and an inner pipe which is inserted into and removed from the outer pipe. In the telescopic extension pipe of the electric vacuum cleaner, in which the inner pipe is pulled out from the outer pipe, and the inner pipe is fixed at the pulled-out position, the press-fitting protrusion is press-fitted into the inner side of the outer pipe. The press-fitting projection is press-fitted by rotating the inner pipe in the circumferential direction, and a press-fitting groove for preventing the inner pipe from coming in and out and fixing the inner pipe is provided on the outside of the inner pipe.

According to a second aspect of the present invention, there is provided a telescopic extension pipe for an electric vacuum cleaner, wherein a stopper which is detachably attached to the outer pipe is provided with the press-fitting projection, an axial slit is formed in the stopper, and the stopper is attached to an end thereof. A protrusion is formed, and a mounting hole into which the mounting protrusion fits is provided in the outer pipe.

According to a third aspect of the present invention, in the extension pipe of the electric vacuum cleaner, a guide rib is provided on the outer surface of the inner pipe in the axial direction.
A guide concave portion into which the guide rib is fitted is provided inside the stopper, and the press-fitting projection is press-fitted into the guide rib to prevent the inner pipe from coming in and out and fix the inner pipe.

According to a fourth aspect of the extension pipe of the vacuum cleaner of the present invention, the guide ribs are provided with a plurality of the press-fitting grooves.

[0012]

In the expansion / contraction extension pipe of the electric vacuum cleaner according to claim 1, the inner pipe is rotated in the circumferential direction so that the press-fitting projection of the outer pipe is press-fitted into the press-fitting groove of the inner pipe. Fix it.

When the stopper is attached to the outer pipe, the expansion extension pipe of the electric vacuum cleaner is bent by the elasticity generated by the slit until the attachment protrusion fits into the attachment hole of the outer pipe. The force for pressing the stopper at the time of attachment to the is reduced.

According to a third aspect of the present invention, in the expansion / contraction extension pipe of the electric vacuum cleaner, the guide rib of the inner pipe and the guide concave portion of the stopper are fitted to guide the inner pipe when the inner pipe is taken in and out, and is rotated in the circumferential direction. Surely prevent movement.

In the expansion extension pipe of the electric vacuum cleaner according to the present invention, the press-fitting projection is press-fitted into the press-fitting groove of the plurality of press-fitting grooves of the inner pipe at a position where the length of the expansion extension pipe is appropriate. Then, adjust the length of the expansion extension pipe to an appropriate length.

[0016]

[First Embodiment] First extension and contraction extension pipe of vacuum cleaner of the present invention
An embodiment will be described with reference to FIGS.

Expansion / contraction extension pipe 1 of the vacuum cleaner of the present invention
Is composed of an outer pipe 2, an inner pipe 3 that can be inserted into and taken out of the outer pipe 2, and a stopper 4 that fixes the inner pipe 3.

The inner pipe 3 is provided with a flange portion 5 for inserting the stopper 4 at the end portion on the insertion side into the outer pipe 2, and the inner pipe 3 is provided near the end portion on the side opposite to this end portion. Block 6 to prevent the inner pipe 3 from entering all
A guide rib 7 is provided from the flange 5 to the blocking flange 6 in the axial direction of the outer surface of the inner pipe 3, and a press-fitting groove 8 for extension is provided in the vicinity of the flange 5 of the guide rib 7. A press-fitting groove 9 for contraction is provided between the blocking collar portion 6 and the blocking collar portion 6. As shown in FIG. 10, the press-fitting groove 9 at the time of contraction is formed by inclining the end portion 7a of the guide rib 7 so that the width of the groove becomes gradually smaller in the circumferential direction. The press-fitting groove 8 for extension is also formed in the same manner.

The stopper 4 is provided with a slit 10 in the axial direction and is formed in a C ring shape, and a guide recess 11 having a width wider than the width of the guide rib 7 into which the guide rib 7 is fitted and inserted inside the stopper 4. The stopper 4 is provided with a press-fitting projection 12 that extends in the circumferential direction toward the guide recess 11 and is press-fitted into both the press-fitting grooves 8 and 9 at the end of the stopper 4 on the inner pipe 3 side. Is provided with a plurality of mounting protrusions 13 (two at a portion opposed to the center of the stopper 4 as a center) for detachably mounting to the outer pipe 2, and the stopper 4 serves as the inner pipe. The stopper 4 is fitted in the end portion of the insertion side 3 of the slit 3 at the slit 10 portion.

A mounting recess 14 for detachably mounting the stopper 4 is provided inside the end of the outer pipe 2 on the insertion side of the inner pipe 3, and a mounting projection 13 of the stopper 4 is provided in the mounting recess 14. Is provided with a mounting hole 15.

Then, the outer pipe 2 of the inner pipe 3
The stopper 4 widened at the slit 10 portion is fitted into the end portion on the insertion side into, and then the stopper 4 is inserted into the outer pipe 2. At this time, a force acts in a direction in which the mounting projection 13 of the stopper 4 comes into contact with the inner surface of the outer pipe 2 and hinders the insertion of the stopper 4 (inner pipe 3). When pressed by the inner surface of the stopper 4, the stopper 4 bends due to its own elasticity so that it is not necessary to apply a large force to push the inner pipe 3. The stopper 4 is pushed in and the mounting projection 13 of the stopper 4 is attached to the mounting hole 15 of the outer pipe 2.
Then, the stopper 4 is mounted in the mounting recess 14 of the outer pipe 2 to assemble the telescopic extension pipe 1.

Then, as shown in FIG. 12, the suction hose 17 connected to the cleaner body 16 is connected to the end portion of the outer pipe 2 of the expansion / contraction extension pipe 1, and the end of the inner pipe 3 of the expansion / contraction extension pipe 1 is connected. The suction port 18 is connected to the part, and cleaning is performed in this state.

The procedure for expanding and contracting the expandable extension pipe 1 having the above structure will be described. First, when the expandable extender pipe 1 is contracted, the inner pipe 3 is contracted until the end of the stopper 4 comes into contact with the blocking flange 6 of the inner pipe 3. Is pushed into the outer pipe 2,
When the stopper 4 comes into contact with the blocking collar portion 6, the inner pipe 3 is rotated in the circumferential direction indicated by the arrow A in FIG.
The press-fitting projection 12 of the stopper 4 is press-fitted into the press-fitting groove 9 when contracted. At this time, since the width of the groove at the entrance of the press-fitting groove 9 is wide, the press-fitting protrusion 12 can be inserted without resistance, but the width of the groove becomes wider as it goes into the inner part of the press-fitting groove 9 at the time of contraction. Becomes narrower, the press-fitting projection 12 is pressed into the press-fitting groove 9 at the time of contraction, the press-fitting projection 12 does not come off from the press-fitting groove 9 at the time of contraction, and the inner pipe 3 is in this state (contracted state). ), The length of the extension pipe 1 is shortened as shown in FIG. 7.

When the expansion / contraction extension pipe 1 is extended from the contracted state, the inner pipe 3 is rotated in the circumferential direction shown by the arrow B in FIG. 9 and is press-fitted into the contraction press-fitting groove 9. The press-fitting projection 12 is pulled out from the press-fitting groove 9 at the time of contraction and the inner pipe 3 is released from the fixed state so that the inner pipe 3 can be contracted in the axial direction. The stopper 4 is pulled out in the axial direction until it comes into contact with the collar portion 5 of the inner pipe 3, and the stopper 4 is attached to the collar portion 5.
When the inner pipe 3 comes into contact with the inner pipe 3, the inner pipe 3 is rotated in the circumferential direction (arrow A) as in the contraction, and the press-fitting projection 13 of the stopper 4 is press-fitted into the press-fitting groove 8 of the inner pipe 3 at the time of expansion. The pipe 3 is fixed in a stretched state, and the expansion / contraction extension pipe 1 is stretched as shown in FIG.

When the inner pipe 3 is expanded or contracted, the inner pipe 3 is
Since the guide rib 7 of the inner pipe 3 and the guide recess 11 of the stopper 4 are fitted and inserted in and out of the inner pipe 3, the inner pipe 3 is rotated more than necessary (the guide recess 11 is press-fitted when the press-fitting projection 12 is extended). It is possible to prevent the inner pipe 3 from rotating so that the inner pipe 3 can be rotated for press-fitting into the groove 8 and the press-fitting groove 9 at the time of contraction. It is possible to easily press-fit into the press-fitting groove 8 for extension and the press-fitting groove 9 for contraction.

In the expansion / contraction extension pipe 1 of the first embodiment, the contraction state of the inner pipe 3 is divided into an expansion state and a contraction state.
Although it is in the state, as in the second embodiment shown in FIG. 12, a plurality of press-fitting grooves 19 are provided between the press-fitting grooves 8 for expansion and the press-fitting grooves 9 for contraction of the guide rib 7 of the inner pipe 3 for cleaning. The extension / contraction extension pipe 1 may be configured to be extendable / contractible to an appropriate length.

[0027]

In the expansion / contraction extension pipe of the vacuum cleaner according to the first aspect of the present invention, the inner pipe is rotated in the circumferential direction so that the press-fitting projection of the outer pipe is press-fitted into the press-fitting groove of the inner pipe and the inner pipe is removed from the outside. Since it can be fixed to the pipe, the diameter of the expansion extension pipe can be minimized to improve the usability, and the structure of the expansion extension pipe can be simplified.

The expansion / contraction extension pipe of the electric vacuum cleaner according to claim 2 is bent by elasticity generated by the slit until the attachment projection fits into the attachment hole of the outer pipe when the stopper is attached to the outer pipe, and the outer pipe is bent. It is possible to reduce the force for pressing the stopper when attaching to the
The stopper can be attached to the outer pipe easily and reliably.

In the expansion / contraction extension pipe of the electric vacuum cleaner according to the third aspect of the invention, the guide rib of the inner pipe and the guide recess of the stopper are fitted to guide the inner pipe when the inner pipe is taken in and out. It is possible to facilitate press-fitting engagement with the press-fitting groove, and surely prevent the inner pipe from rotating in the circumferential direction, thereby improving usability.

In the expansion extension pipe of the electric vacuum cleaner according to the present invention, the press-fitting projection is press-fitted into the press-fitting groove of the plurality of press-fitting grooves of the inner pipe at a position where the length of the expansion extension pipe is appropriate. Since the length of the expansion / contraction extension pipe can be adjusted to an appropriate length, the expansion / contraction extension pipe can be easily adjusted to a length suitable for the place to be cleaned, and the cleaning property can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a telescopic extension pipe of an electric vacuum cleaner according to the present invention.

FIG. 2 is a cross-sectional view of a stopper of a telescopic extension pipe of the present invention.

FIG. 3 is a partial perspective view showing a state in which a stopper is attached to the inner pipe of the expansion extension pipe of the present invention.

FIG. 4 is a cross-sectional view showing a state before the stopper is attached to the outer pipe of the expandable extension pipe of the present invention (the inner pipe is not shown).

FIG. 5 is a state in which a stopper is being inserted (attached) to the outer pipe of the expansion extension pipe of the present invention (the inner pipe is not shown).
FIG.

FIG. 6 is a cross-sectional view showing a state after the stopper is attached to the outer pipe of the expansion / contraction extension pipe of the present invention (the inner pipe is not shown).

FIG. 7 is an overall perspective view showing a contracted state of the expandable extension pipe of the present invention.

FIG. 8 is an overall perspective view showing a stretched state of a telescopic extension pipe of the present invention.

FIG. 9 is a plan view showing a press-fitted state of the inner pipe and the stopper of the expandable extension pipe of the present invention.

FIG. 10 is a plan view showing a press-fitted state of the inner pipe and the stopper of the expandable extension pipe of the present invention.

FIG. 11 is a perspective view showing a state in which the expansion / contraction extension pipe of the present invention is connected to an electric vacuum cleaner.

FIG. 12 is a second extension and contraction extension pipe of the electric vacuum cleaner according to the present invention.
It is a perspective view which shows the inner pipe of an Example.

FIG. 13 is a perspective view showing an example of a telescopic extension pipe of a conventional electric vacuum cleaner.

FIG. 14 is a front sectional view showing a stopper portion of FIG.

FIG. 15 is a side sectional view showing a stopper portion of FIG.

[Explanation of symbols]

 1 Expansion / contraction extension pipe 2 Outer pipe 3 Inner pipe 4 Stopper 5 Collar part 6 Blocking flange part 7 Guide rib 8 Extension press-fit groove 9 Contraction press-fit groove 10 Slit 11 Guide recess 12 Press-fit projection 13 Mounting projection 14 Projection hole

Claims (4)

[Claims] 1. An outer pipe and an inner pipe which is inserted into and taken out of the outer pipe so that the inner pipe is pulled out from the outer pipe, and the inner pipe is fixed at the pulled-out position to expand and contract. In a flexible extension pipe of a vacuum cleaner, a press-fitting protrusion that is press-fitted and engaged with the inside of the outer pipe is provided, and the press-fitting protrusion is provided outside the inner pipe by rotating the inner pipe in the circumferential direction. An expansion / contraction extension pipe for a vacuum cleaner, comprising a press-fitting groove that is press-fitted to prevent the inner pipe from being taken in and out and to fix the inner pipe. 2. The stopper, which is detachably attached to the outer pipe, is provided with the press-fitting projection, and the stopper has a slit in the axial direction and an attachment projection at an end thereof, and the outer pipe has the attachment projection. An expansion / contraction extension pipe for a vacuum cleaner according to claim 1, characterized in that a mounting hole into which is fitted is provided. 3. A guide rib is provided on the outer surface of the inner pipe in the axial direction, and a guide recess is provided inside the stopper, into which the guide rib is inserted, and the press-fitting projection is press-fitted into the guide rib. The expansion / contraction extension pipe for a vacuum cleaner according to claim 1, wherein the press-fitting groove is provided to prevent the container from being taken in and out and to fix the inner pipe. 4. The expansion / contraction extension pipe for an electric vacuum cleaner according to claim 3, wherein the guide rib is provided with a plurality of the press-fitting grooves.