JP2003052592A - Expansion pipe of vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion pipe of a vacuum cleaner capable of preventing breakage of a wiring mechanism. SOLUTION: Expansion springs 10 and 11 electrically connected to terminals 29 and 51 are provided at the ends of an inner pipe 2 and an outer pipe 1, ribs 12a, 13a, 55f and 55g holding the ends of the expansion springs 10 and 11 are provided, and in the expansion springs 10 and 11, the ends of which pinch and are fixed to the ribs 12a and 13a, and 55f and 55g.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention intervenes between a pipe mounting opening of a main body of an electric vacuum cleaner and a power brush for intake, and accommodates an inner tube so that it can be freely taken in and out of an outer tube. The present invention relates to a telescopic pipe for an electric vacuum cleaner including an adjusting mechanism for adjusting the amount of protrusion of the inner pipe from the outer pipe and a wiring mechanism from the main body to the power brush.

[0002]

2. Description of the Related Art Conventionally, as an expandable pipe of an electric vacuum cleaner having a power brush for intake, an inner pipe is provided so that it can be inserted into and removed from the outer pipe, and the length of the inner pipe protruding from the outer pipe is adjusted. It is known that it is elastic and can be locked.

In such a conventional device, it is conceivable that the wiring mechanism of the power source for driving the power brush has a structure in which the length can be changed according to the insertion / removal of the inner tube from the outer tube.

[0004]

However, in such a conventional device, when the wiring mechanism expands and contracts, a force is applied to the connecting portions with the lead wires of the power source at both ends of the wiring mechanism, and the connecting portions are easily damaged. There was a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a telescopic pipe of an electric vacuum cleaner capable of preventing disconnection of a wiring mechanism.

[0006]

SUMMARY OF THE INVENTION The present invention is interposed between a pipe mounting opening of a main body of an electric vacuum cleaner and a power brush for intake, and houses an inner tube so that it can be freely taken in and out of an outer tube. Along with an adjusting mechanism for adjusting the amount of protrusion of the inner tube from the outer tube, and a telescopic pipe of a vacuum cleaner equipped with a wiring mechanism from the main body to the power brush, terminals provided at the ends of the inner tube and the outer tube. And a rib for holding the end of the expandable spring, and the expandable spring is fixed to the rib by sandwiching the rib at the end.

It is preferable to provide a member for holding the expansion spring in a state of sandwiching the rib.

It is preferable that the elastic spring sandwiches the rib at a position of a predetermined number of turns.

Further, the present invention is interposed between the pipe mounting port of the main body of the electric vacuum cleaner and the power brush for intake, and accommodates the inner pipe so that it can be freely taken in and out of the outer pipe, and the outer pipe. In a telescopic pipe of an electric vacuum cleaner equipped with an adjusting mechanism for adjusting the protruding amount of the inner pipe from the main body and a wiring mechanism from the main body to the power brush, an electrical connection is provided between the terminals provided at the ends of the inner pipe and the outer pipe. Wiring mechanism to connect to,
While accommodating a part of the wiring mechanism in the accommodating portion of the inner pipe,
The remaining part of the wiring mechanism is housed in a sleeve which is disposed in the outer tube and part of which is housed in the housing part of the inner tube, and the end of the sleeve is housed in a housing part formed on the outer circumference of the outer tube. Is fixed to the accommodating portion by a cover member arranged on the outer circumference of the outer tube.

It is preferable that the sleeve is made of an antistatic resin.

It is preferable that a packing that secures airtightness between the sleeve and the outer circumference of the sleeve is provided in the opening of the accommodation portion of the inner tube.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
Embodiments of the present invention will be described in detail.

1 (a), 1 (b) and 2
(A), (b) has shown the expansion-contraction pipe of the vacuum cleaner concerning one Example of this invention.

This telescopic pipe is roughly divided into an outer tube 1 connected to the main body of the electric vacuum cleaner (not shown), a connecting member 3 connected to the power brush (not shown) side of the suction means, and an outer member. It is composed of an inner pipe 2 that connects the pipe 1 and the connecting member 3, and the inner pipe 2 is configured to be able to be taken in and out of the outer pipe 1, and to be fixed at an appropriate protruding position. There is.

The outer pipe 1 is provided with a connecting portion 4 for connecting to the main body side, and an operating portion 5 for releasing the engaged state between the outer pipe 1 and the inner pipe 2, and the connecting portion 4 is also connected. The member 3 is provided with a connecting portion 6 for connecting to the power brush side, and a stand piece 7 for hooking the expandable pipe on an engaging portion (not shown) such as a main body when housed.

Further, the inner tube 2 is formed with a housing portion 8 for housing a wiring mechanism for supplying electric power to the power brush, and on the opposite side thereof, a plurality of engaging members are arranged at predetermined intervals. A ditch 9 is formed. Here, during normal use, the direction in which the housing portion 8 is formed is the gravity upward direction, and the direction in which the engagement groove 9 is formed is the gravity downward direction. Further, the engagement groove 9 is formed in a mode parallel to the direction orthogonal to the extension direction of the inner pipe 2.

Here, since the distance from the outer pipe 1 to the connecting member 3 changes according to the protruding amount of the inner pipe 2 from the outer pipe 1, the wiring mechanism housed in the housing portion 8 of the inner pipe 2 , Fig. 3
As shown in (a), (b), FIG. 4, and FIG. 5, it is composed of a pair of expansion springs 10 and 11 formed of a spring material (for example, phosphor bronze steel) having good electrical conductivity and toughness. .
In addition, the wiring mechanism in the outer tube 1 has a sleeve 1 for protection.
It is composed of a pair of lead wires 14 and 15 housed in Nos. 2 and 13 (see FIG. 6A).

The sleeves 12 and 13 are made of an antistatic resin and can be housed in the housing portion 8. One end of the sleeves 12 and 13 is inserted into the housing portion 8. In this way, by forming the sleeves 12 and 13 from the antistatic resin, the generated static electricity causes the sleeves 12 and 1 to
It is possible to avoid a situation where dust adheres to the periphery of 3, and it is possible to prevent the inner tube 2 from being caught in and out of the outer tube 1 and to improve operability.

The expansion springs 10 and 11 are accommodated in the accommodating portion 8 in a manner accommodated in the sleeve 16.
This sleeve 16 is provided with each expansion spring 10,
It is composed of cylindrical portions 16a and 16b into which 11 is inserted, and a bridge portion 16c that connects the cylindrical portions 16a and 16b (see FIG. 6B).

The connecting member 3 is integrally molded with the pipe portion 18 into which the tip of the inner pipe 2 is inserted, the cover member 19 provided above the pipe portion 18 for accommodating the connecting portion 6, and the stand piece 7. And a retainer member 20 for tightening the inserted inner pipe 2 and closing the gap between the inner pipe 2 and the connecting member 3 (Figs. 7 (a), (b),
(C) and FIG. 8).

The connecting portion 6 engages with an engaging claw (not shown) formed in the connecting portion on the power brush side, and a clamp 21 for releasing the engagement, and
It comprises a terminal portion (not shown) for supplying electric power to the power brush side.

The retainer member 20 is separated at the position where it is connected to the stand piece 7, and is fixed by screwing. In addition, the pipe portion 18
A cantilever-shaped engaging claw 22 is formed on the upper side of the, and a projection 23 for deforming the engaging claw 22 inward of the pipe portion 18 is formed inside the cover member 19. There is.

Further, a recess 24 is formed at a position facing the protrusion 23 on the outside of the cover member 19, and a positioning protrusion 25 formed on the retainer member 20 is fitted into the recess 24. It A recess 26 is formed on the side of the pipe 18 opposite to the engaging claw 22, and a positioning projection 27 formed on the retainer member 20 is fitted into the recess 26. Further, the pipe portion 18 has a step portion 18a for receiving the end portion of the inner pipe 2 to be inserted.
Are formed.

The packing 28 is for sealing the gap between the pipe portion 18 and the cover member 19 and the retainer member 20. Further, the connector 29 is for connecting to the wiring mechanism and transmitting electric power to the terminal portion.

Further, as shown in FIG. 9 (a), an engaging hole 30 is formed in the accommodation portion 8 at the tip of the inner tube 2.
In addition, the cap member 31 is provided at the open end of the outer tube 1,
This is for closing the gap between the inner pipe 2 and the outer pipe 1.

The expandable pipe according to the present embodiment, when shipped,
The connecting member 3 is removed from the inner pipe 2 in order to reduce the size of the packing material. To complete the expansion pipe by inserting the connecting member 3 into the inner pipe 2, first, as shown in FIG. 10, with the engagement hole 30 aligned so as to face upward, the pipe portion 18 The inner pipe 2 is inserted into the connecting member 3 until the tip of the inner pipe 2 hits the step portion 18a, and then the retainer member 20 is screwed.

As a result, as shown in FIG. 11, the protrusion 25 of the retainer member 20 pushes the protrusion 23 of the cover member 19, and the engagement claw 22 pushed by the protrusion 23 is deformed to engage the engagement claw 2.
The tip of 2 rushes into the engagement hole 30, and as a result, the connecting member 3 is fixed to the tip of the inner pipe 2.

An example of the operation unit 5 is shown in FIGS.

A stepped portion 1a for accommodating and fixing the operating portion 5 is formed inside the outer tube 1, and an inner tube 2 is provided so that the inner tube 2 can be inserted therethrough. The holding member 33 having a substantially cylindrical shape for holding has an edge portion 34 formed on an end surface facing the step 1a. The edge portion 34 is provided with a substantially annular packing 35.
A stopper member 36 is arranged between the stepped portion 1a and the stepped portion 1a.

Further, in the holding member 33, a window 39 through which the pin 38 that projects into the engagement groove 9 and fixes the inner tube 2 is passed, and the moving range of the pin 38 is restricted, and the pin 38 is also provided. An inclined portion 40 for moving the window to the window 39 is formed.

A substantially annular holder member 41 is arranged outside the holding member 33. The holder member 41 has a recess 42 for accommodating the pin 38 and restricting the range of movement thereof. An inclined portion 45 for moving the pin 38 to the window 39 in cooperation with a wall portion 40a (described later) of the inclined portion 40 provided on the holding member 33 is provided, and the holder member 41 is moved in the moving direction. Knob part 46 for moving
Are integrally formed.

Further, the knob portion 46 and the cap member 31
A spring 47 for urging the holder member 41 in the direction of the connecting portion 4 is provided between and. In addition, the inclined portion 40 of the holding member 33 is formed with vertical wall portions 40a at predetermined intervals, and the inclined portion 4 of the holder member 41 is formed.
5, a wall portion 45a is formed in such a manner that the wall portion 40a can be in close contact therewith. Further, windows 41a and 41b are formed on both side surfaces of the holder member 41.

A packing 48 for securing air tightness between the inserted sleeves 12 and 13 is fixed to the open end of the accommodating portion 8 via a packing stopper 49.

Therefore, the holder member 41 is normally urged to the left by the urging force of the spring 47, as shown in FIG. 12, and the wall portion 4 of the inclined portion 45 of the holder member 41.
The position of the holder member 41 is regulated in such a manner that the 5a abuts on the wall portion 40a of the inclined portion 40 of the holding member 33. At this time, the pin 38 housed in the recess 42 is
The holder member 41 is pushed by the wall portion 40a of 0 to move toward the window 39, rides on the inclined portion 45 of the holder member 41, and protrudes from the window 39 into one of the engaging grooves 9 of the inner pipe 2 and the holder member 41. Ride on the flat part of.

As a result, the pin 38 is attached to the holder member 41.
And the holding member 33, the pin 38 connects the window 39 of the holding member 33 and the engagement groove 9 of the inner pipe 2, so that the inner pipe 2 is fixed in that state. In addition, the holding member 33
The edge 34 of the stopper member 36 and the packing 3
While hitting the step 1a of the outer tube 1 through 5,
Since the opposite side is closed by the cap member 31 fixed to the outer pipe 1, the holding member 33 is fixed to the open end of the outer pipe 1. Thereby, the inner pipe 2 is fixed to the outer pipe 1 via the holding member 33, the pin 38, and the holder member 41.

From this state, when the knob portion 46 is moved in the direction of the cap member 31 of the outer tube 1 against the biasing force of the spring 47, the flat portion of the holder member 41 causes the window 39 to move.
Since the concave portion 42 is located below the window 39, the pin 38 falls off the window 39 and moves down the inclined portion 45 to the concave portion 42.

As a result, the fixed state of the inner pipe 2 is released, so that the inner pipe 2 can be fed out from the outer pipe 1, and the inner pipe 2 can be inserted into the outer pipe 1 and the inner pipe 2
The amount of protrusion from the outer tube 1 can be adjusted.

In this way, in this embodiment, since the knob portion 46 is formed integrally with the holder member 41, the number of parts of the operating portion 5 can be reduced, the cost can be reduced, and the assembling can be performed. It is possible to improve the property. Furthermore, the structure of the operation unit 5 is simplified, and the operation can be performed more reliably than when the operation unit 5 is composed of a plurality of parts.

Further, the wall portion 4 of the inclined portion 40 of the holding member 33.
0a and the wall portion 45a of the inclined portion 45 of the holder member 41 are in close contact with each other, so that the pin 38 accommodated in the concave portion 42 rides on the inclined portion 45 from the concave portion 42 and the window 3
The movement of the pin 38 until reaching 9 becomes very smooth, and it is possible to avoid inconveniences such as being caught when the inner tube 2 is taken in and out.

Further, since the spring 47 is provided on the same side as the knob portion 46, it is possible to prevent the holder member 41 and the like from moving like a kozil around the pin 38 as a fulcrum due to the urging force of the spring 47. .

An example of the wiring mechanism of this embodiment is shown in FIGS.
2 shows.

At one end of the expansion springs 10 and 11,
One end of the lead wires 14 and 15 that are wiring members to the connecting portion 4 is connected, and the other end of the expansion springs 10 and 11 is a connector contact member that is one element of the wiring member to the connecting portion 6. The lead wires 52 and 53 of 51 are connected.

The expansion springs 10 and 11 constituting the main wiring mechanism in the inner pipe 2 are shown in FIGS.
As shown in (c), the outer dimension of the central portion is the cylindrical portion 1.
6a, 16b are formed to have a size slightly smaller than the inner diameters, and both ends thereof are gradually narrowed so that the outermost ends are formed into a taper shape in which a plurality of small diameter parts are continuously formed, and the final one turn of the ends is formed. Is raised 90 degrees and leads 14,
Connecting rings 10a, 10 for connecting 15, 52, 53
b, 11a, 11b. In addition, lead wire 1
4, 15, 52 and 53 are connecting rings 10a, 10b and 11
After being entangled with a and 11b, it is fixed by soldering.

Further, the connector contact member 51 and the expansion springs 10 and 1 connected to the connector contact member 51.
As shown in FIG. 21, the end portion of the No. 1 on the side of the connecting rings 10b and 11b is housed in the cord cover 55 in which the insertion opening of the connector 29 is formed.

The cord cover 55 is a chamber 55a for accommodating the connector contact member 51 for connecting with the connector 29.
And has a shape in which two cylindrical portions 55b and 55c for accommodating the expansion springs 10 and 11 are connected, and is configured to be fitted and formed by being divided into two in the thickness direction.

The cylindrical portions 55b and 55c are inserted into the cylindrical portions 16a and 16b of the sleeve 16, respectively. Therefore, both ends of the expansion springs 10 and 11 are formed to have a diameter smaller than the central portion by a dimension corresponding to the thickness of the cylindrical portions 55b and 55c.

When both ends of the expansion springs 10 and 11 are formed to have the same outer diameter, the cylindrical portions 16a and 16b of the sleeve 16 are attached to the cylindrical portions 55b and 5 of the cord cover 55, respectively.
5c is inserted, the cylindrical portion 16a of the sleeve 16
16b has a large diameter, and the cylindrical portions 16a, 1 of the sleeve 16
A gap is formed between the inner surface of 6b and the expansion springs 10 and 11. With this configuration, when the inner pipe 2 is taken in and out of the outer pipe 1, the expansion springs 10 and 11 move the cylindrical portions 16a and 16b.
When it is bent inside, a strong load acts on that portion, and the extension springs 10 and 11 are disconnected during long-term use.

The lead wire 5 is attached to the cylindrical portions 55b and 55c.
Fixing parts 55d and 55e for fixing the 2, 3 and 53 and ribs 5 for holding the ends of the expansion springs 10 and 11.
5f and 55g are formed, and the inner diameter of the 5f and 55g is determined according to the size of the small diameter portion at the end of the expansion springs 10 and 11. The ribs 55f and 55g are formed in a substantially D shape so that a gap can be formed above the ribs 55f and 55g when the cord cover 55 is fitted and formed. In addition, the rib 5 is cut out at the center.
The connecting rings 10b and 11b of the expansion springs 10 and 11 are inserted into the notches of the 5h and 55i, respectively, so that the connection rings 10b and 11b can rotate as the expansion springs 10 and 11 move. To be prevented.

Here, as shown in FIG. 22, the small-diameter portions at the ends of the expansion springs 10 and 11 are fixed to the cord cover 55 in such a manner that the ribs 55f and 55g are sandwiched at a position about 4 turns from the ends. .

In this way, the outermost ends of the turns are received by the cylindrical portions 55b and 55c of the cord cover 55, and the connecting portions to the cylindrical portions 55b and 55c are ribs 55f and 5c.
Since it is received by 5g and the inner surfaces of the cylindrical portions 55b, 55c,
The spring load when the expansion springs 10 and 11 expand and contract can be absorbed in this portion, so that the life of the expansion springs 10 and 11 can be extended.

Further, both ends of the expansion springs 10 and 11 are formed to have a small diameter corresponding to the inner diameters of the cylindrical portions 55b and 55c of the cord cover 55, and the central portion thereof has the cylindrical portion 1 of the sleeve 14.
Since the expansion springs 10 and 11 are formed to have a large diameter corresponding to the inner diameters of the expansion springs 4a and 14b, the expansion springs 10 and 11 are deformed along the inner walls of the cylindrical portions 16a and 16b of the sleeve 16. The spring load at the time of expansion and contraction can be reduced, so that the expansion springs 10 and 1
The life of 1 can be extended.

On the other hand, as shown in FIG. 18, the opposite ends of the expansion springs 10 and 11 have ribs 12a, which are formed at the ends of the sleeves 12 and 13 at several turns of the outermost ends thereof.
The sleeves 12 and 13 are housed in the chambers 12b and 13b formed at the ends of the sleeves 12 and 13 so as to sandwich the sleeve 13a.

Therefore, at this end as well, the spring load when the expansion springs 10 and 11 expand and contract is absorbed in this part, whereby the expansion springs 10 and 1 are absorbed.
The life of 1 can be extended.

Further, ribs 12c and 13c each having a notch formed in the central portion for sandwiching and holding the connecting rings 10a and 11a of the expansion springs 10 and 11 are provided on the sleeves 12 and 13, respectively. This rib 12c,
By 13c, the rotation of the connecting rings 10a and 11a is restrained when the expandable springs 10 and 11 expand and contract.

Further, as shown in FIG. 23, the sleeve 1
The end portions of the connecting portions 2 and 13 on the side of the connecting portion 4 are inserted into the accommodating portion 58 formed in the upper portion of the outer tube 1, and are accommodated by the engaging portion 60 protruding from the cover member 59 provided in the upper portion. It is fixed to the portion 58.

Therefore, the sleeves 12 and 13 are connected to the outer tube 1.
In order to attach it to the housing, it suffices to insert the end portion into the housing portion 58, and the attaching work becomes very simple and reliable.

Further, at the tip of the lead wires 14 and 15,
The terminals 61 and 62 are connected, and the terminals 61 and 62 are fixed to a fixed seat 64 formed on the upper surface of the outer tube 1.

Further, the projection 65 is for engaging with an element connecting to the connecting portion 4. As this engaging means, the same means as the clamp 21 in the connecting portion 6 can be applied.

[0059]

As described above, according to the first aspect of the present invention.
According to the configuration described in (1), since the expansion spring is fixed to the rib by sandwiching the rib that holds the expansion spring end, the load is not applied to the connecting portion between the expansion spring and the lead wire, It is possible to prevent disconnection of the connection portion.

According to the configuration of claim 2 of the present invention,
Since the expansion spring is provided with a member that holds the rib in a sandwiched state, the expansion spring does not easily come off the rib, and it is possible to prevent a load from being applied to the connecting portion between the expansion spring and the lead wire. Therefore, it is possible to reliably prevent disconnection of the connection portion.

According to the configuration of claim 3 of the present invention,
Since the expansion spring is configured to sandwich the rib at a predetermined number of turns, the expansion spring does not easily come off the rib, and it is possible to prevent a load from being applied to the connecting portion between the expansion spring and the lead wire. Therefore, it is possible to reliably prevent disconnection of the connection portion.

According to the configuration of claim 4 of the present invention,
It is possible to improve the workability of mounting the sleeve and to perform a reliable work of mounting.

According to the configuration of claim 5 of the present invention,
Since the sleeve is made of antistatic resin, it is possible to prevent dust from adhering to the circumference of the sleeve due to the generated static electricity, and to prevent the inner tube from being caught during contraction operation. Further, there is an effect that operability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a stretched pipe according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a state in which a telescopic pipe according to an embodiment of the present invention is contracted.

FIG. 3 is a schematic sectional view of a telescopic pipe according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along the line aa of FIG.

FIG. 5 is a schematic partial sectional view showing a telescopic pipe according to an embodiment of the present invention.

6 is a sectional view taken along the line bb and a sectional view taken along the line cc of FIG.

FIG. 7 is a three-sided view showing a configuration of an attach section.

FIG. 8 is a schematic cross-sectional partial view showing a configuration of an attachment portion.

FIG. 9 is a schematic configuration diagram showing an example of a telescopic pipe before attaching an attaching part.

FIG. 10 is a schematic perspective view for explaining an operation when attaching the attaching unit.

FIG. 11 is a schematic cross-sectional partial view for explaining the fixing of the attachment part and the inner pipe.

FIG. 12 is a schematic cross-sectional partial view for explaining an operation unit.

FIG. 13 is a schematic sectional view for explaining an operation unit.

FIG. 14 is a schematic perspective view showing an example of a holder member.

FIG. 15 is a schematic perspective partial view showing an inclined portion of a holder member.

FIG. 16 is a schematic perspective view showing an example of a holding member.

FIG. 17 is a schematic perspective partial view showing an inclined portion of a holding member.

FIG. 18 is a schematic sectional partial view for explaining the operation of the operation unit.

FIG. 19 is a schematic sectional view part for explaining a wiring mechanism.

FIG. 20 is a schematic view showing an example of a telescopic pipe.

FIG. 21 is a schematic perspective view showing an example of a cord cover.

FIG. 22 is a schematic partial sectional view for explaining a fixed state of the expansion spring with respect to the cord cover.

FIG. 23 is a schematic partial sectional view showing the structure of the wiring mechanism near the connecting portion.

24 is a cross-sectional view taken along the line ee of FIG.

FIG. 25 is a schematic diagram showing a structure of a wiring mechanism near a connecting portion.

[Explanation of symbols]

1 outer tube 2 inner tube 3 connecting members 4,6 Connection part 5 Operation part 8 accommodation 9 engagement groove 10,11 Telescopic spring 12,13 sleeve 12a, 13a rib 14,15,52,53 Lead wire 48 packing 55 code cover 55a room 55b, 55c Cylindrical part 55f, 55g rib 58 Housing 59 Cover member 60 Engagement part

Claims (6)

[Claims] 1. An inner tube that is interposed between a pipe mounting port of a main body of an electric vacuum cleaner and a power brush for intake air, accommodates an inner tube so that it can be freely taken in and out of an outer tube, and an inner tube from the outer tube. In an expander / contractor pipe of an electric vacuum cleaner having an adjusting mechanism for adjusting the amount of protrusion of the inner pipe and a wiring mechanism from the main body to the power brush, the extender / contractor electrically connected to the terminals provided at the ends of the inner pipe and the outer pipe. With a spring,
A telescopic pipe for an electric vacuum cleaner, wherein a rib for holding an end portion of the telescopic spring is provided, and the telescopic spring has an end portion sandwiching the rib and fixed to the rib. 2. A member for holding the expansion spring in a state of sandwiching a rib.
Telescopic pipe for the vacuum cleaner described. 3. The expandable pipe for an electric vacuum cleaner according to claim 1, wherein the expandable spring sandwiches a rib at a position of a predetermined number of turns. 4. The inner tube is interposed between the pipe mounting port of the main body of the electric vacuum cleaner and the power brush for intake air, accommodates the inner tube so that it can be taken in and out of the outer tube, and the inner tube from the outer tube. In a telescopic pipe of an electric vacuum cleaner equipped with an adjusting mechanism for adjusting the amount of protrusion of the inner tube and a wiring mechanism from the main body to the power brush, wiring for electrically connecting terminals provided at ends of the inner tube and the outer tube. A mechanism is provided, and a part of the wiring mechanism is housed in the housing part of the inner pipe, and the rest of the wiring mechanism is housed in a sleeve that is arranged in the outer pipe and part of which is housed in the housing part of the inner pipe. An expandable pipe for an electric vacuum cleaner, wherein the sleeve end is housed in a housing formed on the outer circumference of the outer tube, and the sleeve is fixed to the housing by a cover member arranged on the outer circumference of the outer tube. 5. The telescopic pipe for an electric vacuum cleaner according to claim 4, wherein the sleeve is formed of an antistatic resin. 6. The expandable pipe for an electric vacuum cleaner according to claim 4, wherein a packing for ensuring airtightness between the inner tube and the outer circumference of the sleeve is provided in the opening of the accommodation section of the inner tube.