JPH0956648A - Vacuum cleaner extension tube - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a telescopic extension tube having an electrical connection means excellent in strength, durability, safety and storability. [Structure] An inner pipe 206 that is movably inserted into an outer pipe 205 and has a plurality of locking recesses 212 in the axial direction, and a guide body 217 fixed to the tip end of the outer pipe 205, and supported and locked. The body is pushed into one of the locking recesses 212 and the inner tube 2
06 is locked to the outer pipe 205, an operating body for manually displacing the restraint body, terminals 210 and 211 respectively provided at the ends of the inner pipe 206 and the outer pipe 205, and an electrical connection between both terminals. A storage part above the outer pipe 205, which is configured by disposing the conductor in a tubular protective body 232 separated from the ventilation passage of the inner pipe 206 and separated from the ventilation passage of the outer pipe 205. 220
A conductor derived from the protective body 232 is arranged on the outer tube 2
A locking body, a restraining body, and an operating body are arranged below 05, and the inner pipe 20
6 is a structure in which a locking recess 212 provided below 6 is locked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an outer tube and an inner tube that moves in the outer tube. The inner tube can be pulled out from the outer tube to a desired length and can be expanded and contracted, and can be locked at an arbitrary length. The present invention relates to an extension tube of an electric vacuum cleaner.

[0002]

2. Description of the Related Art A conventional extension tube for an electric vacuum cleaner is a shokai sho6.
There was a structure shown in Japanese Patent No. 1-164649. The structure of this extension pipe will be described with reference to FIGS. In the figure, reference numeral 3 denotes a telescopic extension tube composed of an inner tube 4 and an outer tube 5. Reference numeral 9 is an extension cord having plugs 10 and 11 at both ends. By connecting one plug 10 to the connecting part of the suction tool and the other plug 11 to the connecting part of the hand switch part, respectively, it is connected to the suction tool side. Electrically connect to the main body of the vacuum cleaner via the hand switch. In addition, a coil portion 9a formed by curling is provided in the middle of the extension cord 9,
The coil portion 9a is always in a contracted state and is extended by an external force. Reference numeral 12 is a code clip attached to the inner pipe 4, 13 is a code clip integral with or separate from the outer pipe 5, and the extension code 9 is a cord clip on both ends of the coil portion 9a. -By being retained by the clip clips 12, 13, they are supported by the inner and outer pipes 4, 5, respectively.

In the above arrangement, the extension tube 3 is normally shown in FIG.
As shown in FIG. 3, the inner and outer tubes 4 and 5 are stored and stored in a contracted state. At this time, the coil portion 9a of the extension code 9 is located along the extension tube in a contracted state. Next, when the extension tube 3 is used, the lock button 14 is operated to
The inner and outer tubes 4 and 5 are extended as shown in FIG. 5, and at this time, the coil portion 9a of the extension code 9 is also extended. Thus, the extension cord 9 is configured to expand and contract according to the extension and contraction state of the extension tube 3.

[0004]

However, in the conventional construction, since the extension cord 9 is attached to the outer peripheral side of the extension pipe 3 in an exposed state, the extension cord 9 is attached to the object during the cleaning work. It was easily caught, cleaning workability was poor, the extension cord 9 was easily damaged, and durability was also a problem. Further, the extension code 9 is exposed even when the extension tube 3 is contracted, for example, when it is stored, and it looks bad and is easily caught or damaged by an object. Had.

The present invention solves the above problems, and an object of the present invention is to provide an extension tube for an electric vacuum cleaner which does not impair cleaning workability and is excellent in durability and storability.

[0006]

A first object of the present invention for solving the above-mentioned problems is to provide an outer tube and a plurality of locking recesses which are movably inserted in the outer tube and which are axially arranged. An inner pipe, a guide body fixed to the tip of the outer pipe, and a guide body supported by the guide body, and the locking body is pushed into one of the locking recesses to lock the inner tube to the outer tube. Restraint body to
An operating body for manually displacing the restraint body, terminals provided at the ends of the inner pipe and the outer pipe, and a conductor electrically connecting the both terminals are provided, and the conductor is the inner pipe. It is placed in a cylindrical protective body that is separated from the ventilation path of the outer tube, and the conductor drawn from the protective body is placed in the storage section above the outer tube that is configured separately from the ventilation path of the outer tube. The locking body, the restraining body, and the operating body are arranged in the above, and the locking recess provided under the inner pipe is locked.

According to a second problem solving means, the restraint body in the first problem solving means is provided with a pressing portion for pushing the locking body into the locking recess and a relief portion for allowing the locking body to escape from the locking recess, An operating portion interlocking with the operating body is arranged in the outer peripheral direction of the guide body, and the operating body is slid in the axial direction when the operating portion is pressed in the axial direction, and the restraining body is axially moved by the movement of the operating body. It is configured to be slid to switch between pressing of the locking body by the pressing portion of the restraining body and release of the locking body by the releasing portion of the restraining body.

A third problem solving means is to urge the operating body in the first and second problem solving means by a spring body, and urge the restraining body toward the distal end of the inner pipe by the urging of the operating body by the spring body. It is something that is done.

A fourth problem-solving means urges the operating body in the first and second problem-solving means by a spring body, and urges the operating body by the spring body to urge the restraining body toward the terminal side of the outer tube. It is a force.

In a fifth problem solving means, the inner pipe in the first to fourth problem solving means is formed of a light metal such as aluminum.

A sixth problem solving means is that the inner tube in the first to fifth problem solving means is formed of resin.

A seventh problem-solving means is to form a convex portion at one or two places on the outer periphery and at the end portion of the inner pipe in the first to sixth problem-solving means so that the convex portion is fitted into the convex portion. The inner shape of the outer tube is formed, and a rotation preventing portion that prevents relative rotation of the inner tube with respect to the outer tube is configured.

An eighth problem-solving means is one in which the convex shape of the inner pipe in the seventh problem-solving means is fixed by caulking a rivet or the like formed by a header process to the inner pipe.

[0014]

According to the first problem solving means, the conductor for connecting the terminals provided in the inner pipe and the outer pipe, respectively, is constructed separately from the ventilation passages of the inner pipe and the outer pipe. Does not cause pressure loss in the ventilation path, and the conductor is stored in the storage part of the outer tube when the extension tube contracts, improving the strength, durability and safety without applying external force to the conductor. , It also looks good. Further, when the inner tube is expanded and contracted, the extension tube can be expanded and contracted with improved workability because the finger is positioned so as to touch the operating body by grasping the tip of the outer tube.

According to the second means for solving the problem, when the operating portion is pressed in the axial direction, the operating body is slid in the axial direction, and the restraining body is slid in the axial direction by the movement of the operating body, so that the restraining body Since the pressing of the locking body by the pressing portion and the escape of the locking body by the release portion of the restraining body are switched, when releasing the locking body, the operating portion is grasped in the gripping direction, that is, the axial direction. Since it only has to be pressed, the operability of the operating portion can be improved, and the extension / contraction work of the extension pipe can be improved.

According to the third means for solving the problems, since the constraining body is biased toward the tip of the inner tube by the biasing of the operating body by the spring body, the inner tube moves from the tip to the outer tube. When an external force is applied by hitting a wall or the like during use, the inclination of the locking recess of the inner pipe pushes the locking body up while rotating the locking body, and the locking body rotates to rotate the locking body with a spring. Since it tries to pull in the same direction as the urging direction, the inner tube does not shrink due to external force,
The safety is further improved.

According to the fourth problem solving means, the restraint body is biased toward the terminal of the outer pipe, and the restraint body is restrained in the catching recess of the inner pipe. The inner tube can be contracted by attaching a suction tool or the like to the operating body and the outer tube at the same time to push the inner tube toward the tip side of the inner tube during cleaning, which improves usability.

According to the fifth means for solving the problems, since the inner pipe is formed of a light metal such as aluminum, the thickness of the wall of the inner pipe can be made thinner than that of the resin, and the outer diameter of the inner pipe can be reduced. In addition to being able to reduce weight, the operational burden during use is greatly reduced and strength is secured.
The strength and durability can be improved.

According to the sixth means for solving the problems, the inner pipe is
Since it is made of resin such as S, ribs for attaching components such as terminals to the outer peripheral portion of the inner pipe can be integrally and easily configured.

According to the seventh means for solving the problems, the convex portion is formed at the end portion of the inner pipe and at one or two places on the outer periphery, and the inner shape of the outer pipe is formed so as to be fitted with the convex portion. However, since the detent portion that prevents the relative rotation of the inner tube with respect to the outer tube is configured, the detent strength between the outer tube and the inner tube can be improved and the position can be ensured at any stretched state.

According to the eighth means for solving the problems, the convex shape is constituted by caulking and fixing a rivet or the like formed by header processing to the inner pipe, so that the rotation preventing strength between the outer pipe and the inner pipe is further improved. It can be done.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, the overall configuration of the vacuum cleaner will be described with reference to FIG. As shown in the drawing, the end portion of the hose 202 is connected to the suction port of the cleaner body 201 incorporating the electric blower (not shown), and the hand portion 203 is provided on the other end side of the hose 202.
Thus, the operation of the electric blower in the cleaner body 201 is operated. Conductive wires are arranged in the hose 202, and the hand portion 2
03 and the cleaner body 201 are electrically connected.

An extension tube 204 that can be expanded and contracted at the hand portion 203
Is connected. The extension tube 204 is provided at the hand portion 203.
The outer pipe 205 connected to the side and the inner pipe 206 inserted in the outer pipe 205 so as to be movable in the axial direction.
One end of the floor nozzle 208 has a built-in electric brush 207
Is connected. The conductor 2 is also axially attached to the extension pipe 204.
09 is arranged to supply electric power from the hand portion 203 to the electric brush 207 of the floor nozzle 208.

Further, the extension pipe will be described in detail. As shown in FIG. 1, the outer tube 205 has a connecting portion A205a to be connected to the proximal portion 203 side, and a connecting terminal A210 for electrically connecting is provided on the connecting portion A205a side.
05 is electrically connected to the conductor in the storage portion 220 extending in the axial direction. In addition, the connecting portion B20 of the inner pipe 206
A connection terminal B211 that is electrically connected to the floor nozzle 208 is disposed at 6a, and is electrically connected to a conductor inside a protector 232 that extends in the axial direction of the inner pipe 206. In this way, the conductor 203 arranged on the extension tube 204 causes the hand portion 203
Although electric power is supplied between the floor nozzle 208 and the floor nozzle 208, the conductor 209 can be used as a signal line between the hand portion 203 and the floor nozzle 208 in addition to the electric power supply.

Further, a plurality of locking recesses 212 are arranged in the axial direction of the inner pipe 206, and a guide body 217 is fixed to the end of the outer pipe 205 on the inner pipe 206 side. The guide body 217 is the inner tube 2
06 has a locking body that locks in the locking recess 212 of
An operation unit 216 for performing a releasing operation of the locking body is provided. By operating the operation portion 216, the locked state between the locking body and the locking recess 212 can be released, and the inner pipe 20 can be released.
6 can be moved to extend and contract the extension tube 204.

Further, as shown in FIG. 3 and FIG.
Reference numeral 09 denotes a cylindrical protective body 23 attached in parallel with the inner pipe 206.
2 is disposed inside the outer tube 2 and the end portion of the protective body 222 is the outer tube 2.
It is configured to move inside the storage section 220 provided in 05. The storage section 220 is separated from the ventilation path of the outer tube 205,
Dust that passes through the ventilation path will not flow in. The conductor 20 located inside the housing 220 from the end of the protector 232.
9 is flexibly accommodated, and even if the protector 232 moves inside the accommodating portion 220 in conjunction with expansion and contraction of the inner tube 206, the length of the conductor 209 is insufficient and the inner tube 206 is elongated. Of the conductor 209 or the conductor 209 is prevented from being exposed to the outside due to its excessive length. The conductor 209 is formed of a flexible flat cable,
It is possible to move smoothly even in the limited space of the storage part 220.

Next, the locking structure of the guide body 217 provided on the inner pipe 206 and the outer pipe 205 will be described with reference to FIGS.
The guide body 2 is provided on the outer peripheral side of the inner pipe 206 at the tip of the outer pipe 205.
17 and the guide body 217 is attached to the outer tube side. In the space between the guide body 217 and the cover body 221, a spring 222 for urging the operating portion 216 upward is arranged.
The operating portion 216 rotates about a rotating shaft 223, and operating bodies 224 extending toward the side surface are formed at both ends of the rotating shaft 223. By rotating the rotating shaft 223, a tip portion of the operating body 224 is formed. Is a structure that moves like an arrow. The restraint body 228 that is interlocked with the movement of the tip of the operation body 224 is attached to the guide body 217 so as to be slidable in the arrow H direction.

A convex portion 231 extending in the axial direction is formed on both side surfaces of the restraining body 228, and ribs 230 extending in the axial direction are provided on both side surfaces of the guide body 217. Since the convex portion 231 of the restraint body 228 is located along the rib 230 of the guide body 217, the restraint body 228 can be moved smoothly. The lower end of the restraining body 228 has a holding portion 226 that holds the locking body 225 such as a pin in the locking recess 212 of the inner tube 206. The holding portion 226 is made of a stainless steel plate, and moves its position as the restraining body 224 slides. Next to the pressing portion 226, a relief portion 227 for releasing the locking body 225 such as a pin is provided.

Here, when the user pushes the operating portion 216 in the arrow direction, that is, in the axial direction, both end portions of the operating body 224 move in the arrow direction, and in conjunction with this movement. The restraint body 228 moves in the front end direction (arrow direction) of the outer tube 205. Therefore, the pressing portion of the restraint body 228 also moves, and the locking body 225 escapes to the escape portion 227. When the inner pipe 206 is moved in the axial direction in this state, the locking body 225 is attached to the escape portion 227 of the restraining body 228.
This allows the inner tube 206 to move, allowing the inner tube 206 to move.

With the above structure, the conductor 209 and the protector 22 covering the conductor 209 as the inner tube 206 expands and contracts.
2 also moves in the storage part 221 and expands and contracts, and since the conductor 209 is arranged separately from the ventilation passages of the outer pipe 205 and the inner pipe 206, there is no pressure loss in the ventilation passages and the suction performance. Will not hurt. Further, when the extension tube 204 is contracted, the conductor 209 is housed in the housing portion 221 of the outer tube 205 to prevent an external force from being applied to the conductor 209, and the strength is
The durability is improved and the appearance is improved. When the inner pipe 206 is further expanded and contracted, the outer pipe 205
Since the finger is positioned so as to touch the operation portion 216 by gripping the tip of the, the usability is improved. Moreover, the gripping direction and the operation direction of the operation unit 216 (axial direction)
Is the same, the operability of the operation unit 216 is also good,
The operability during expansion and contraction can be improved.

The second embodiment will be described with reference to FIG. FIG.
As shown in FIG. 7, the restraint body is biased in the direction of the connection terminal B211 (arrow I direction) of the inner pipe 206 by the biasing of the operating body 224 by the spring 222.

With the above construction, when the inner pipe 206 is applied from the distal end to the outer pipe 205 in the direction of the outer pipe 205 during use and an external force F is applied to the inner pipe 206 during use, the locking recess 212 of the inner pipe 206 is inclined to cause the pin to move. While the locking body 225 such as a pin is pushed toward the restraining body side while rotating, the restraining body tries to pull in the locking body 225 such as a pin in the same direction as the direction in which the spring is biased. 225 is released, the inner tube 206 does not contract, and it is possible to prevent the extension tube from inadvertently contracting.

The third embodiment will be described with reference to FIG. FIG.
As shown in FIG. 3, the operating body 302 is connected to the guide body 217 and the outer tube 2.
It is arranged in the space 05, and the operating body 302 is the inner pipe 206.
Is urged by the spring 303 in the direction of the connection terminal B211 (direction of the tip). Further, the inner pipe 206 is attached to the operating body 225.
The retaining recess 302 is provided with a retaining portion 302b for retaining the retaining body 225 such as a pin and a relief portion 302a.
02 also has the function of a restraint body.

With the above structure, the user can operate the operating body 302.
By pulling in the direction of the user, that is, in the D direction, the locking body 225 and the escape portion 302a can be opposed to each other, and the inner tube 206 can be expanded and contracted. In addition, inner pipe 2
When the external force F is applied from the tip 06 toward the outer tube 205 in the direction from the tip to the wall during use, the inner tube 206
Due to the inclination of the locking concave portion 212, a force for pushing up while rotating the locking body 225 is exerted. However, the pressing portion 302
Since b tries to pull in the locking body 225 in the same direction as the spring biasing direction, the locking body 225 is released, and it is possible to prevent the inner tube 206 from contracting due to an external force.

A fourth embodiment will be described with reference to FIG. As shown in FIG. 10, the operating body 302 is biased by the spring 303 in the direction of the connection terminal A 205 a of the outer pipe 205, and the inner pipe 2
The locking body 225 is constrained in the locking recess 212 of No. 06.

With the above structure, a suction tool or the like is attached to the tip of the inner tube 206 to operate the operating body 302 in the E direction during cleaning, and the outer tube 205 is pushed toward the tip side of the inner tube 206. Stop body 225 escape section 302a
To the inner tube 206, and the locking by the locking body 225 is released. Moreover, since the force in the F direction acts on the inner tube 206,
6 can be easily shortened and the usability is improved.

In the fifth embodiment, the inner tube 206 is made of a light metal such as aluminum.

With the above construction, even if the inner tube 206 is made of resin, the strength can be secured more than the resin even if the wall thickness is made thinner, and the strength and durability are improved and the weight is reduced by thinning. It is possible and reduces the burden at the time of use.

In the sixth embodiment, the inner pipe 206 is set to A
It is made of resin such as BS.

With the above configuration, the inner pipe 206 and the connecting portion 2
The ribs for attaching components such as 06a and the connection terminal B211 can be easily configured, the assemblability can be improved, the number of components can be reduced, and the cost can be reduced.

The seventh embodiment will be described with reference to FIG. As shown in FIG. 11, two convex portions 300 are formed on the connection terminal A206a side of the inner pipe 206 and above the outer circumference.
Moreover, the line connecting the top of this convex portion and the axis O has an angle of about 40 degrees with respect to the vertical line G. In addition, the convex portion 3
00 is formed by a horizontal surface 300a and a vertical surface 300b, and the inner shape of the outer pipe 205 is formed in an arc shape of the convex portion 300 and the inner pipe so as to fit with the convex portion 300.

With the above configuration, the outer pipe 20 of the inner pipe 206
By configuring the anti-rotation portion that prevents relative rotation with respect to 5, it is possible to improve the anti-rotation strength between the outer tube and the inner tube and ensure the position at any stretched state.

In the eighth embodiment, as shown in FIG. 12, the shape of the convex portion 300 is formed by caulking and fixing a rivet or the like formed by header processing to the inner pipe 206.

With the above-mentioned structure, the rotation preventing strength between the outer pipe and the inner pipe can be further improved.

[0045]

According to the first aspect of the present invention, the conductor for connecting the terminals provided in the inner pipe and the outer pipe, respectively, is formed separately from the ventilation passages of the inner pipe and the outer pipe. The body does not suffer pressure loss in the ventilation path, and the conductor is housed in the housing part of the outer tube when the extension tube contracts, improving the strength, durability and safety without applying external force to the conductor. At the same time, it looks good. Further, when the inner tube is expanded and contracted, the extension tube can be expanded and contracted with improved workability because the finger is positioned so as to touch the operating body by grasping the tip of the outer tube.

According to the second aspect of the present invention, when the operating portion is pushed in the axial direction, the operating body is slid in the axial direction, and the restraining body is slid in the axial direction by the movement of the operating body, and the restraining body is pushed. Since it was designed to switch between holding the locking body by the part and releasing the locking body by the restraining body, when releasing the locking body, hold the operating part in the gripping direction, that is, in the axial direction. Therefore, it is possible to improve the operability of the operating portion and improve the extension / contraction workability of the extension tube.

According to the third aspect of the present invention, the restraint body is biased toward the tip of the inner tube by the biasing of the operating body by the spring body, so that the inner tube is used from the tip toward the outer tube. When an external force is applied by hitting a wall etc. inside, the inclination of the locking recess of the inner pipe pushes the locking body toward the restraining body side while rotating the locking body, and the rotation of the locking body biases the restraining body with a spring. The inner tube does not shrink due to an external force because it tries to pull in in the same direction as that in which it is doing, and the safety is further improved.

According to the fourth aspect of the present invention, the restraining body is biased toward the terminal of the outer pipe, and the locking body is restrained in the locking recess of the inner pipe. The inner tube can be contracted by attaching a suction tool or the like and simultaneously pushing the operating body and the outer tube toward the tip side of the inner tube during cleaning, which improves usability.

According to the invention of claim 5, since the inner pipe is formed of a light metal such as aluminum, the thickness of the wall of the inner pipe can be made thinner than that of resin, and the outer diameter of the inner pipe can be reduced. In addition to being able to reduce the weight, it is possible to reduce the operation load during use, to secure the strength, and to improve the strength and durability.

According to the sixth aspect of the present invention, since the inner pipe is made of resin such as ABS, ribs for attaching parts such as terminals to the outer peripheral portion of the inner pipe can be easily and integrally formed. is there.

According to the invention of claim 7, a convex portion is formed at the end of the inner pipe and at one or two places on the outer periphery, and the inner shape of the outer pipe is formed so as to fit with the convex portion. By configuring the rotation prevention part that prevents relative rotation of the inner pipe with respect to the outer pipe,
It is possible to improve the detent strength between the outer tube and the inner tube and to surely secure the position in any expansion / contraction state.

According to the eighth aspect of the present invention, the convex shape is formed by caulking and fixing a rivet or the like formed by header processing to the inner pipe, so that the rotation preventing strength between the outer pipe and the inner pipe is further improved. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a side view of an extension tube of an electric vacuum cleaner showing a first embodiment of the present invention.

FIG. 2 is a side view of the electric vacuum cleaner showing the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a sectional view of an essential part of an extension tube of the electric vacuum cleaner showing the first embodiment of the present invention.

FIG. 6 is a view on arrow X in FIG.

FIG. 7 is a perspective view showing an assembled state of the locking body, the restraining body, and the operating body.

FIG. 8 is a sectional view of an essential part of an extension pipe of an electric vacuum cleaner showing a second embodiment of the present invention.

FIG. 9 is a sectional view of an essential part of an extension pipe of an electric vacuum cleaner showing a third embodiment of the present invention.

FIG. 10 is a sectional view of an essential part of an extension pipe of an electric vacuum cleaner showing a fourth embodiment of the present invention.

FIG. 11 is a cross-sectional view of an extension tube of an electric vacuum cleaner showing a seventh embodiment of the present invention.

FIG. 12 is a cross-sectional view of an extension tube of an electric vacuum cleaner showing an eighth embodiment of the present invention.

FIG. 13 is a side view showing a state in which the extension tube of the conventional electric vacuum cleaner is stored.

FIG. 14 is a side view showing the extension state of the extension tube of the conventional electric vacuum cleaner.

[Explanation of symbols]

 204 Extension pipe 205 Outer pipe 206 Inner pipe 209 Conductor 210 Connection terminal A 211 Connection terminal B 212 Locking recess 217 Guide body 220 Storage part 222 Spring 224 Operating body 225 Locking body 226 Holding part 227 Relief part 228 Restraint body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyuki Ota 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Akihiro Hirano 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Kazuma Suo 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hidenori Kitamura 1006, Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. An outer tube, an inner tube movably inserted into the outer tube and having a plurality of locking recesses in the axial direction, a guide body fixed to the tip of the outer tube, and the guide. A restraint body supported by the body and pushing the lock body into one of the lock recesses to lock the inner pipe to the outer pipe; an operating body for manually displacing the restraint body; An outer pipe is provided with a terminal provided at each end of the pipe and a conductor electrically connecting the two terminals, and the conductor is arranged in a tubular protective body separated from the air passage of the inner pipe. The electric conductor led out from the protective body is arranged in the storage section above the outer tube which is formed separately from the ventilation passage of the above, and the locking body, the restraining body and the operating body are arranged below the outer tube. An extension tube for an electric vacuum cleaner configured to lock a locking recess provided under the vacuum cleaner. 2. The restraint body is provided with a pressing portion for pushing the locking body into the locking recess, and a relief portion for escaping the locking body from the locking recess, and an operation interlocking with the operating body in the outer peripheral direction of the guide body. Parts are arranged, and the operating body is slid in the axial direction when the operating portion is pressed in the axial direction. The restraining body is slid in the axial direction by the movement of the operating body, and An extension tube for an electric vacuum cleaner according to claim 1, wherein the extension tube of the vacuum cleaner is configured to switch between pressing and releasing of the locking body by the releasing section of the restraining body. 3. The vacuum cleaner according to claim 1, wherein the operating body is biased by a spring body, and the restraining body is biased toward the tip of the inner tube by the biasing of the operating body by the spring body. Extension tube. 4. The extension of the electric vacuum cleaner according to claim 1, wherein the operating body is biased by a spring body, and the restraining body is biased toward the terminal side of the outer tube by the biasing of the operating body by the spring body. tube. 5. An extension tube for a vacuum cleaner according to claim 1, wherein the inner tube is made of a light metal such as aluminum. 6. The extension tube for an electric vacuum cleaner according to claim 1, wherein the inner tube is made of resin. 7. An inner pipe is formed with an inner shape so that the inner pipe has an end portion and one or two places on the outer circumference, and an inner shape is formed so as to be fitted with the protruding portion. The extension tube for an electric vacuum cleaner according to any one of claims 1 to 6, wherein a rotation stopping portion that prevents relative rotation is configured. 8. An extension tube for an electric vacuum cleaner according to claim 7, wherein the convex shape of the inner tube is formed by caulking and fixing a rivet or the like formed by header processing to the inner tube.