JPH08322772A - Suction pipe for electric vacuum cleaner - Google Patents

Abstract

PURPOSE: To enables extending or contracting of a suction pipe without using a cord reel by arranging an electrically energizing means to keep an electrically energizing part provided at one pipe in contact with an electrically energizing part provided at the other pipe while the contact part thereof moves relatively with the extension or contraction of a pipe assembly body. CONSTITUTION: In a pipe assembly body 4 in which an outer pipe 2 and an inner pipe 3 are assembled free to extend or contract in a double tube structure, an electrically energizing means 15 has an electrically energizing part 13 on the outer circumference side of the inner pipe 3 and an electrically energizing part 14 on the inner circumference side of the outer pipe 2. When the inner and outer pipes 3 and 2 are assembled as pipe assembly body 4, these electrically energizing parts 13 and 14 are kept in contact with each other to allow electric conduction between both end parts thereof. In the electrically energizing means 15, the electrically energizing part 13 is built as electric energization zone along the axial direction of a pipe and the electrically energizing part 14 as a slide element 34 slidable on the electric energization zone. The pipe assembly body 4 is also provided with a length adjusting means 18 to allow changing over of the extension or contraction of the inner and outer pipes 3 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction pipe used in a vacuum cleaner.

[0002]

2. Description of the Related Art An electric vacuum cleaner includes a type having a movable part such as an electric brush in a suction head part, and a suction pipe (flexibility of the suction head part and the cleaner body side) used in the electric vacuum cleaner of this type. For the pipe material that connects to the hose),
It is necessary to incorporate a wiring section for power supply and signal transmission to the movable section.

By the way, in vacuum cleaners, it is generally preferable to make the suction pipe extendable according to the height and use of the user. Therefore, in the suction pipe that needs to have the wiring part built in as described above, a cord reel should be attached to the end of the suction pipe near the gripping part so that the wiring part also expands and contracts as the suction pipe expands and contracts. Is considered (see Japanese Patent Laid-Open No. 6-165745).

[0004]

In the structure in which the cord reel is attached to the suction pipe, since the cord reel increases in size and weight, handling of the suction pipe by women, children, elderly people, etc. (Including moving and moving) is difficult. Not only that, the cord reel has various problems such as frequent malfunctions and easy disconnection, and higher manufacturing costs.

The present invention has been made in view of the above circumstances, and has a structure in which a wiring portion is built-in and can be expanded and contracted, is excellent in handleability, is less likely to cause a failure or disconnection, and has a manufacturing cost. It is an object of the present invention to provide a suction pipe for an electric vacuum cleaner capable of suppressing soaring of the vacuum cleaner.

[0006]

In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, the pipe assembly in which the inner and outer pipes are elastically assembled by the double pipe structure is provided with the energizing means capable of conducting between both ends thereof, and the energizing means is one pipe. The first energizing portion provided on the pipe and the second energizing portion provided on the other pipe are in contact with each other, and the contact portion is relatively moved as the pipe assembly expands and contracts. I am trying.

In the energizing means, the first energizing portion is a conducting band provided along the axial direction of the tube, and the second energizing portion is a slider capable of sliding contact on the conducting band. It is possible. The pipe having the first current-carrying portion has its interior partitioned along the tube axis direction into a cavity portion for storing the current-carrying band and a suction passage, and the pipe having the second current-carrying portion is A flexible conductive material that can be inserted into the inside from one end portion in the longitudinal direction is provided, and the slider can be connected and held by the projecting end portion of the conductive material.

The pipe assembly may be provided with length adjusting means capable of stepwise switching between expansion and contraction of the outer pipe and the inner pipe. The pipe assembly is provided with a seal portion around the inward end portion of the inner pipe that will remain in the outer pipe even when it is maximally extended and that blocks a circumferential gap from the outer pipe in the pipe axial direction. It is preferable to put it.

[0009]

In the pipe assembly in which the inner pipe and the outer pipe are assembled by the double pipe structure so as to expand and contract, the moving means such as an electric brush is provided because the energizing means is provided between both ends of the pipe assembly. The suction head part and the flexible hose on the cleaner body side can be connected. As the energizing means, the first energizing portion and the second energizing portion, which are separately provided for the inner and outer pipes, are in contact with each other and the contact portions are relatively moved, and the cord reel is used. The structure can be simplified and downsized as compared with the conventional one.

As the energizing means, both the first and second energizing parts may be long energizing bands in the tube axis direction.
From the viewpoint of structural simplification, it is preferable that only the first current-carrying portion is the current-carrying band and the second current-carrying portion is the slider. In this case, the second current-carrying portion is configured such that the slider is connected to one end of a flexible conductive material, and the first current-carrying portion is formed by partitioning from the suction passage in the pipe. It can be configured to be housed and fixed in the cavity. In this way, the first part of the pipe assembly expands and contracts as it expands and contracts.
The slider of the second energizing unit moves within the energizing unit.
Therefore, it is possible to prevent the first conducting portion from being exposed to the outside or the inside (inside the suction passage) of the pipe assembly when the pipe assembly is extended, and it is of course possible to prevent discharge, electric leakage, electric shock, etc. It can prevent unsightly appearance.

If the pipe assembly is provided with a length adjusting means so that the degree of expansion and contraction can be changed stepwise, there is an advantage that the length can be easily and quickly adjusted. Further, there is an advantage that the length can be surely maintained after the adjustment. In the pipe assembly, if a seal part is provided around the inward end of the inner pipe,
It is possible to prevent a gap from being formed between the inner pipe and the outer pipe due to, for example, the conductive material of the second conducting portion. Therefore, there is an advantage that the suction pressure can be prevented from leaking.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 10 show a first embodiment of a suction pipe 1 according to the present invention. In this suction pipe 1, as shown in FIGS. 1 and 2, an outer pipe 2 and an inner pipe 3 are double pipes. Pipe assembly 4 having a structure and being stretchably assembled
Is the main subject.

In the pipe assembly 4, a flexible hose 7 provided on the cleaner body 6 is provided at the outward end of one pipe (the upper end of the outer pipe 2 in FIG. 2).
(In addition, 7a is an operation gripping portion) is provided with an insertion portion 8 for enabling joining / disengagement, and the other end of the other pipe (in FIG. 2, the lower end portion of the inner pipe 3). 2), the receiving portion 1 for enabling joining / disengaging with the suction head portion 10 provided with a movable portion (not shown) such as an electric brush.
1 is provided.

Both the outer pipe 2 and the inner pipe 3 are round pipes, and the relationship between the inner diameter of the outer pipe 2 and the outer diameter of the inner pipe 3 is such that the inner pipe 3 does not rattle in the outer pipe 2. It is dimensioned to allow telescopic sliding. As shown in FIG. 1, the inner pipe 3 has a first outer peripheral side.
A current-carrying portion 13 is provided, and a second current-carrying portion 14 is provided on the inner peripheral side of the outer pipe 2. In the first and second energizing portions 13 and 14, the inner and outer pipes 3 and 2 are the pipe assembly 4
When they are combined with each other, they are brought into contact with each other to allow conduction between both ends of the pipe assembly 4, and thereby the energizing means 15 is configured.

The pipe assembly 4 retains the structure of the energizing means 15 (conduction between the first energizing portion 13 and the second energizing portion 14) even when the inner and outer pipes 3, 2 are expanded and contracted. In order to do so, a detent means 17 for preventing mutual idling around the tube axes of both pipes 2 and 3 is provided. Further, the pipe assembly 4 is provided with a length adjusting means 18 capable of stepwise switching between expansion and contraction of the inner and outer pipes 3, 2.

First, the energizing means 15 will be described. In the energizing means 15, the first energizing portion 13 provided on the inner pipe 3 includes two energizing bands 20 each having a strip shape along the tube axis direction of the inner pipe 3 as shown in FIG. It is attached to the inner pipe 3 while maintaining a predetermined interval. When the first current-carrying portion 13 is provided in the inner pipe 3, a part of the outer peripheral surface along the pipe axis direction is deformed radially inward to form the flat portion 21, and the flat portion 21 is A cover portion 22 is additionally provided to form a hollow portion 23 for storing a conduction band, which is separated from the suction passage 3a between the flat portion 21 and the cover portion 22.

The cover portion 22 is formed in the shape of an elongated plate having a partial arcuate cross section, and due to the formation of the flat portion 21 as described above, it is provided between the inner and outer pipes 3 and 2. It is possible to replenish the resulting gap in the axial direction of the pipe. Ultrasonic welding was used to fix the conduction band 20 and the cover 22 to the flat portion 21 (note that
(Adhesion, heat welding, screwing, etc. may be used).

The inner pipe 3 has an inwardly directed end portion (on the left side in FIG. 1) directed inward of the outer pipe 2 at the outer pipe 2.
Although the seal portion 25 is provided in a portion that remains in the outer pipe 2 even when it is maximally extended, the flat portion 21 and the cover portion 22 do not reach the seal portion 25. Then, the seal portion 25 and the cover portion 22
A cavity inlet 26 opening along the tube axis direction is provided between and.

On the other hand, at the outward end portion (right side in FIG. 1) of the inner pipe 3, there is provided a receptacle portion 11 used for connection with the suction head portion 10 (see FIG. 2) as described above. However, as shown in FIG. 3B, the cover portion 22 is provided with a raised portion 22a that widens the cavity portion 23 corresponding to the receiving portion 11. And this raised portion 22a
A socket tool 27 is housed inside, and the energization band 20 is connected to each of a pair of female electrodes (not shown) built in the socket tool 27. Therefore, the female-side electrode of the socket tool 27 and the male-side electrode (not shown) provided on the suction head portion 10 side are connected via the terminal insertion hole 28 formed facing the outer end of the inner pipe 3. It is possible to join and release.

In FIG. 3B, reference numeral 30 is a movable stopper portion for holding the joined state with the suction head portion 10, 30a is a push button portion, 30b is a swing fulcrum, and 30c.
Is a locking claw, and 30d is a return spring. The energizing means 15
In FIG. 1, the second current-carrying part 14 provided on the outer pipe 2 has one end fixed to the outward end (left side in FIG. 1) of the outer pipe 2 as shown in FIG. It has a flexible conductive material 33 and a slider 34 connected to the projecting end portion of the conductive material 33 as shown in FIG.

As shown in FIG. 6, the conductive material 33 is a flexible sheet material 35 to which two printed wires 36 made of copper foil or the like are adhered, and these printed wires 36 are insulated and coated to some extent. It has the strength of the waist and is excellent not only in flexibility but also in elastic recovery. Incidentally, reference numeral 37 is an exposed portion for connection for connecting with the male electrode 40 provided on the outward end portion of the outer pipe 2 as shown in FIG. As shown in FIGS. 1 and 4, the conductive material 33 is pressed and urged toward the inner peripheral surface of the outer pipe 2 by the spring ring 41 (see FIG. 7) fitted to the inner peripheral surface of the outer pipe 2 to bend the waist. Etc. are prevented from occurring.

As shown in FIG. 6, the slider 34 has a pair of shoes 44 attached to the moving plate 43, which are bent in a "U" shape, and each shoe 44 is attached to the conductive material 33. Is connected to each printed line 36. As shown in FIG. 8, both the conductive material 33 and the slider 34 are formed to have a width and a thickness that can be inserted into the hollow portion 23 of the inner pipe 3. Then, when the outer pipe 2 and the inner pipe 3 are combined, each shoe 44 of the slider 34 is
So as to contact each conduction band 20 of the first conduction portion 13,
The conductive material 33 is the cavity inlet 26 of the cavity 23 (see FIGS. 1 and 3).
(A), see FIG. 4). Therefore, as the inner and outer pipes 3 and 2 expand and contract, the slider 34 (each shoe 44) of the second energizing portion 14 and the energizing band 20 of the first energizing portion 13 slide and move with each other. (See FIG. 5).

In the present embodiment, the movement of the slider 34 is smoothed as described above, and each shoe 44 and the energizing band 20 are smoothed.
To prevent the derailment with and the short circuit accompanying this derailment,
A plurality of guide rails 47 along the pipe axis direction are provided at appropriate positions on the inner surfaces of the flat portion 21 and the cover portion 22 of the inner pipe 3.
(See FIG. 8). In addition, in the conductive material 33 of the second conducting portion 14 (see FIG. 6), the flexible sheet material 35
9 has a laminated structure in which a printed board 48 on which the printed lines 36 are adhered is sandwiched between a base sheet 49 and a covering sheet 50 as shown in FIG. The base sheet 49 is formed as thin as possible, the cover sheet 50 is formed as narrow as possible, and the printed circuit board 48 is also formed as narrow as possible, instead of being formed thick as necessary. I did it. This allows the conductive material 33 to be contained in a low bulk (compact) along the inner surface of the cover portion 22 and the inner surface of the outer pipe 2. In addition, such a measure is used when the circumferential gap between the outer pipe 2 and the inner pipe 3 is blocked in the pipe axial direction by the seal portion 25 (see FIGS. 3A and 4) provided on the inner pipe 3. , It will be useful in not hindering the sealing property.

Further, the inner pipe 3 (see FIGS. 1 and 3)
(A), see FIG. 4), by sloping the bank portion along the pipe axis direction connecting the flat portion 21 to the seal portion 25, and forming the end portion of the cover portion 22 obliquely, the cavity portion is formed. The cavity inlet 26 of 23 is slightly inclined with respect to the radial direction of the inner pipe 3. Thereby, the cavity 2
The conductive material 33 can be smoothly taken in and out of the No. 3.

As described above, the seal portion 25 makes the pressing force of the conductive material 33 good, and allows the conductive material 33 to be rubbed and slid smoothly, and has a sealing property with respect to the inner peripheral surface of the outer pipe 2. In order to be able to raise
A plurality of rings are formed in a row at predetermined intervals (see FIGS. 1 and 4). Next, the detent means (see FIG. 1)
Will be described.

The detent means 17 is provided on the outer peripheral surface of the inner pipe 3 along the pipe axis and the pipe portion of the outer pipe 2 extending from the outside to the inside of the pipe wall. It is configured by a combination with the protruding engaging piece 56.
In the inner pipe 3, the groove portions 55 have finite ends in the longitudinal direction (that is, the groove portion 55 does not pass through the inner pipe 3 in any of its pipe axis directions).

As shown in FIG. 10 (c), the engaging piece 56 is formed by integrally inserting an inserting piece 58 having a press-fitting claw 57 with respect to the decorative lid 59. The portion of the press-fitting claw 57 fits into the groove 55 (see FIG. 5). On the other hand, as shown in FIG.
As shown in (a), an H-shaped fitting hole 61 and a deformation permitting hole 62 which is arranged close to both sides of the fitting hole 61 in the pipe axis direction are formed so as to penetrate therethrough. Therefore, the rib 63 is left between the fitting hole 61 and the deformation permitting hole 62 as shown in FIG. In the fitting hole 61, the opening size in the tube axis direction is the insertion piece 58 of the engagement piece 56.
The length is formed to be substantially the same as the length (excluding the press-fitting claw 57). Further, the rib 63 is formed in an inverted triangular cross section in which the inner surface side of the outer pipe 2 is wide and the outer surface side is narrower.

For this reason, when the engaging piece 56 is press-fitted into the fitting hole 61, the rib 63 temporarily elastically deforms and allows the press-fitting claw 57 to pass therethrough, and then the rib 6 is pressed.
3 is restored to prevent the press-fitting claw 57 from coming out, the engagement piece 56 is prevented from coming off, and as a result, the combined state of the inner pipe 3 and the outer pipe 2 cannot be easily disassembled. This is useful in that the disassembling work by an ordinary person who is unfamiliar with the electric field and the assembly structure of the pipe assembly 4 can be prevented.

Next, the length adjusting means 18 (see FIG. 1)
Will be described. As shown in FIG. 5, the length adjusting means 18 includes a plurality of positioning recesses 66 provided on the outer surface of the inner pipe 3 at predetermined intervals along the tube axis direction, and the positioning at the inward end of the outer pipe 2. It has a movable stopper portion 67 that is detachably provided in the concave portion 66.

In the inner pipe 3, the positioning recess 66 is formed.
Are provided on the outer surface of the cover portion 22 as shown in FIG. Therefore, in the injection molding or the like, the positioning recess 66 is formed together with the molding of the cover portion 22.
In the case of forming the positioning recess 66 in the cover portion 22 by machining, the advantage that the formation can be easily performed as compared with the case of forming the positioning recess 66 in the inner pipe 3 itself. is there.

Moreover, for example, if the type of cover 22 having no positioning recess 66 is prepared, the length adjusting means 1 can be selected by selecting the cover 22.
There is an advantage that the parts having the inner pipe 3 can be shared between the type having 8 and the type not having. The movable stopper portion 67 is basically the same as the movable stopper portion 30 (see FIG. 3B) of the inner pipe 3 described above. 67a is a push button portion, 67b is a swing fulcrum, and 67c is a locking claw. 67d are return springs. However, with respect to the shape of the locking claw 67c, the engagement with the positioning recess 66 is performed at an acute angle or at a right angle.
A sufficient locking force is exerted regardless of whether a force is applied in the extending direction or the retracting direction.

As is apparent from the above description, in the suction pipe 1 according to the present invention, the length adjusting means 18 operates the movable stopper portion 67 of the outer pipe 2 (push button portion 67a).
By pressing (), the pipe assembly 4 can be freely expanded and contracted. At this time, the energizing means 15 moves the slider 34 of the second energizing unit 14 in the cavity 23 of the inner pipe 3 while
The conducting state of the energizing portion 13 (conducting band 20) is maintained, and this conducting state is ensured because the rotation stopping means 17 prevents mutual rotation of the inner and outer pipes 3 and 2, Then, by releasing the operation of the movable stopper portion 67 at an arbitrary position (position of the positioning recess 66), the pipe assembly 4 can be locked to a desired length.

The present invention is not limited to the above-mentioned first embodiment. For example, in the pipe assembly 4,
Flexible hose 7 with inner pipe 3 provided in cleaner body 6
The outer pipe 2 can be joined / disengaged with the suction head portion 10
It is possible to connect and disconnect with. Further, the flexible hose 7, the suction head portion 10 and the like may be integrally connected to the outer pipe 2 or the inner pipe 3.

As a means for adjusting the length of the pipe assembly 4, a collet structure (tightening structure with a diameter reducing ring) is used.
It is possible to adjust the expansion and contraction of the outer pipe 2 and the inner pipe 3 in a stepless manner by adopting. Needless to say, the cross-sectional shapes and materials of the outer pipe 2 and the inner pipe 3 are
It is not limited in any way.

As shown in FIG. 11 in the second embodiment of the present invention, in the energizing means 15, the first portion is provided on the inner peripheral side of the outer pipe 2.
The energizing portion 13 is provided, and the second energizing portion 1 is provided on the outer peripheral side of the inner pipe 3.
4 may be provided. Further, as shown in FIG. 12 as the third embodiment of the present invention, the hollow portion 2 is formed in the inner pipe 3.
When providing 3, the intermediate partition plate 70 can be inserted into the pipe to partition the suction passage 3a and the cavity 23. In this third embodiment, the cavity 2
The first energizing portion 13 (energizing band 20) is fixed to the inner peripheral surface of the inner pipe 3 inside the second energizing portion 1.
The slider 34 of 4 was made to move.

The partition plate 70 can be integrally formed with the inner pipe 3. 13 to 1
Reference numeral 6 shows a fourth embodiment of the suction pipe 1 according to the present invention. In the fourth embodiment, as shown in FIGS. 13 and 15, a first conducting portion 13 is provided on the inner peripheral side of the outer pipe 2. As shown in FIG. 14, the second energizing portion 14 is provided on the outer peripheral side of the inner pipe 3.
Is provided.

The first conducting part 13 is a conducting band 20 made of a thin strip material or the like which is directly connected to the male electrode 40 provided on the outward end portion (left side in FIG. 13) of the outer pipe 2. The second current-carrying portion 14 is a pair of sliders 3 fixed radially outward at the inward end portion (left side in FIG. 14) of the inner pipe 3.
4, the female side electrode (not shown) of the socket tool 27 provided at the outward end portion (right side in FIG. 14) of the inner pipe 3 is connected by the lead wire 72. The slider 34 is formed by folding a wire material back into a hook shape. In addition,
The inner pipe 3 is provided with a cover portion 74 for securing and securing a mounting space for the slider 34 and the lead wire 72.
However, the cover portion 74 is slightly different in operation from the cover portion 22 (see FIG. 3 and the like) described in the first embodiment, and the cavity portion 23 (which accommodates the first conducting portion 13 and It is not intended to allow the movement of the slider 34 in the second energization portion 14). Therefore, the cover portion 74 of the fourth embodiment can be replaced by insert molding or the like.

In the fourth embodiment, both the inner and outer pipes 3, 2
16, the slider 34 of the second current-carrying portion 14 and the first current-carrying portion 13 (current-carrying band 20) move in sliding contact with each other. In addition, in FIG.
Is a cover material formed of rubber, soft resin, or the like, and is capable of closing a portion of the first energization portion 13 that is not in sliding contact with the slider 34. This prevents dust or the like sucked in the outer pipe 2 from adhering to the first energization portion 13.

Further, in the fourth embodiment, the inward end portion (range in which the movable stopper portion 67 is provided) of the outer pipe 2 (see FIG. 13) is formed from the short pipe material 78 which is separate from the main pipe portion 77. , And a structure connecting both of them. This is the groove 7 for fixing the first conducting portion 13 to the main portion 77.
This is a measure to prevent the groove 77a from reaching the inward end when the 7a is recessed. Also,
Also in the inner pipe 3 (see FIG. 14), the inward end portion (the range in which the seal portion 25 and the slider 34 are attached) is formed of a short pipe member 81 that is separate from the main pipe portion 80, and these are connected together. Made into a structure. This is a measure for simplifying (molding) the mounting structure of the lead wire 72, the cover portion 74, and the like.

[0040]

According to the present invention, which has the above-mentioned structure, the inner pipe and the outer pipe are extensible and assembled by the double pipe structure, and the energizing means is provided between both ends thereof. Therefore, it is possible to connect the suction head portion including the movable portion such as the electric brush and the flexible hose on the cleaner body side. As the energizing means, the first energizing portion and the second energizing portion, which are separately provided for the inner and outer pipes, are in contact with each other and the contact portions are relatively moved, and the cord reel is used. The structure can be simplified and downsized as compared with the conventional one. Therefore, it is easy to handle, and it is possible to prevent breakdown, disconnection, and the like, and it is also possible to suppress an increase in manufacturing cost.

For the energizing means, it is preferable to use only the first energizing portion as the energizing band and the second energizing portion as the slider for structural simplification. In particular, the second current-carrying part is such that the slider is connected to one end of the flexible conductive material, and the first current-carrying part is housed and fixed in a cavity defined by the suction passage of the pipe. Therefore, even when the pipe assembly is expanded or contracted, it is possible to prevent the first current-carrying portion from being exposed to the outside or the inside (in the suction passage) of the pipe assembly, and as a result, the discharge or the electric leakage. In addition to preventing electric shock, it is possible to prevent poor appearance.

If the pipe assembly is provided with a length adjusting means so that the degree of expansion and contraction can be changed stepwise, there is an advantage that the length can be adjusted easily and quickly. Further, there is an advantage that the length can be surely maintained after the adjustment. In the pipe assembly, if a seal part is provided around the inward end of the inner pipe,
It is possible to prevent a gap from being formed between the inner pipe and the outer pipe due to, for example, the conductive material of the second conducting portion. Therefore, there is an advantage that the suction pressure can be prevented from leaking.

[Brief description of drawings]

FIG. 1 is an exploded side sectional view showing a first embodiment of a suction pipe according to the present invention.

FIG. 2 is a perspective view illustrating a usage state of the first embodiment.

FIG. 3 shows an inner pipe in the first embodiment,
(A) is a partially broken perspective view of an end portion facing inward,
(B) is a side cross-sectional view toward the outward end portion.

FIG. 4 is a side sectional view showing a state in which the inward end portion of the inner pipe is positioned toward the outward end portion of the outer pipe in the first embodiment.

FIG. 5 is a side sectional view showing a portion of the outer pipe of the first embodiment, which is close to the outward end portion.

FIG. 6 is a perspective view showing a second energization section in the first embodiment.

FIG. 7 is a perspective view showing a spring ring used to hold a second conducting portion.

FIG. 8 is an enlarged cross-sectional view taken along the line AA of FIG.

9 is an enlarged cross-sectional view of a part (flexible conductive material) of FIG.

10A and 10B show a rotation stopping means provided near the inward end portion of the outer pipe in the first embodiment, wherein FIG. 10A is a plan view, FIG. 10B is a side sectional view, and FIG. c) is a perspective view of the engagement piece.

FIG. 11 is a schematic view showing a second embodiment of the suction pipe according to the present invention, (a) is in a retracted state, and (b) is in an extended state.

FIG. 12 is a front sectional view showing an inner pipe used in a third embodiment of the suction pipe according to the present invention.

FIG. 13 is a side sectional view showing an outer pipe used in a fourth embodiment of the suction pipe according to the present invention.

FIG. 14 is a side sectional view showing the upper half of the inner pipe used in the fourth embodiment of the suction pipe according to the present invention and the side view of the lower half.

FIG. 15 is an enlarged sectional view taken along line BB of FIG.

FIG. 16 is an enlarged front cross-sectional view showing a contact state between a first conducting portion and a second conducting portion in the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 suction pipe 2 outer pipe 3 inner pipe 3a suction passage 4 pipe assembly 13 1st energizing part 14 2nd energizing part 15 energizing means 17 turning stop means 18 length adjusting means 20 energizing band 21 flat part 22 cover part 23 cavity part 25 seal part 33 flexible conductive material 34 slider 55 groove part 56 engagement piece 66 positioning recess 67 movable stopper part

Claims (5)

[Claims] 1. A pipe assembly (4) in which inner and outer pipes (3, 2) are stretchably assembled by a double pipe structure is provided with an energizing means (15) capable of conducting between both ends thereof. In the energizing means (15), the first energizing part (13) provided on one pipe and the second energizing part (14) provided on the other pipe are in contact with each other, and the contact part is A suction pipe for an electric vacuum cleaner, characterized in that the suction pipe is moved relative to the pipe assembly (4) as it expands and contracts. 2. The energizing means (15) is a conducting band (20) in which a first energizing portion (13) is provided along the tube axis direction.
The suction pipe for a vacuum cleaner according to claim 1, wherein the second energizing portion (14) is a slider (34) capable of sliding contact on the energizing band (20). 3. The pipe having the first energizing portion (13) is divided into a hollow portion (23) for accommodating the energizing band (20) and a suction passage (3a) in the pipe axial direction. The pipe having the second conducting portion (14) is provided with a flexible conductive material (33) which can be inserted into the hollow portion (23) from one longitudinal end thereof. 33)
The suction pipe for a vacuum cleaner according to claim 2, characterized in that the slider (34) is connected and held at a tip end of the suction pipe. 4. The pipe assembly (4) is provided with length adjusting means (18) capable of stepwise switching between expansion and contraction of the outer pipe (2) and the inner pipe (3). The suction pipe for an electric vacuum cleaner according to any one of claims 1 to 3, which is characterized. 5. The pipe assembly (4) has an outer pipe (2) around the inward end of the inner pipe (3) which remains in the outer pipe (2) even when it is maximally extended. The suction pipe for a vacuum cleaner according to any one of claims 1 to 4, further comprising: a seal portion (25) for blocking a circumferential clearance between the suction pipe and the pipe gap in the tube axis direction.