JPH1132953A - Connecting part structure for suction pipe of vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting part structure for a suction pipe of a vacuum cleaner capable of lightly executing mutual sliding between an outer pipe and an inner pipe (an extending/contracting operation of the suction pipe), improving the abrasion resistance of a seal ring and reducing producing cost. SOLUTION: The seal ring 8 with plural press contact parts 50 along the axial direction of an inner pipe 3 is used instead of an O-ring. In addition, at the pipe 3, ring-formed recess parts 51 corresponding to the parts 50 are formed with respect to the fitting part of the ring 8. As a ring-formed deflection allowable time is formed between the rear surface of the ring 8 and the pipe 3 by these parts 51, a ring 8 deflect-deforms the parts 50 according to the direction and the size of a sliding load of the ring 8 to obtain a proper sealing effect. Thereby, rubber hardness is set to be high to improve abrasion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As shown in FIG. 12, in a vacuum cleaner 80, an outer pipe 85 and an outer pipe 8 are used as a suction pipe 83 connected between a suction head section 81 and a flexible hose 82.
5 has an inner pipe 86 which is slidably inserted into the inner pipe 86, and an input / output amount operation section 87 for holding and adjusting the degree of input / output of the inner pipe 86 with respect to one end of the outer pipe 85.
Is known.

[0003] In this kind of suction pipe 83, the in-out operation section 8
In order to secure and simplify the adjustment of the inner pipe 86 by the 7, engagement recesses 88 are usually provided at predetermined intervals in the axial direction on the outer surface of the inner pipe 86.
Since the inner pipe 86 generally has a hollow circular cross section, a structure for preventing relative rotation between the outer pipe 85 and the inner pipe 86 is required. It has been.

In this structure, as shown in FIG. 13, a detent rail 89 is formed along the axial direction on a side of the inner pipe 86 opposite to the engagement recess 88, and the inner pipe 86 is An inward projection 90 capable of engaging with the detent rail 89 was provided. This projection 90 is provided as a separate small part 91 from the outside of the outer pipe 85.
, Or formed integrally with the inner surface of the outer pipe 85 in a dowel shape (not shown).

On the other hand, in the inner pipe 86, the outer pipe 8
A seal ring 93 is fitted to the end inserted on the side 5 to thereby prevent air leakage and the like. As the seal ring 93, an O-ring (not shown) or the like in which pressure contact portions 94 protruding annularly outward in the radial direction are provided at a plurality of locations in the axial direction has been used.

[0006]

Conventionally, when an O-ring is used as the seal ring 93 provided on the inner pipe 86, the elasticity based on the diameter of the ring cross section (not the diameter of the ring but the thickness of the material). This seals the circumferential gap between the outer pipe 85 and the inner pipe 86, so that it is necessary to use a material having a rubber hardness of about 60 ° or lower (soft).

For this reason, in an O-ring seal ring,
When the outer pipe 85 and the inner pipe 86 are repeatedly slid relative to each other, they may be easily worn. The seal ring 93 having a plurality of press-contact portions 94 shown in FIG. 13 is employed for the reason that the above-mentioned disadvantage of the O-ring seal ring is eliminated. However, in the case of the illustrated seal ring 93, the contact area increases as the number of the press contact portions 94 increases. Therefore, the outer pipe 85 and the inner pipe 8
In order to reduce the sliding resistance when sliding relative to the outer ring 6, not only the seal ring 93 itself but also the outer pipe 85 is used.
It is necessary to set small tolerances on the accuracy of the inner diameter of the inner pipe and the outer diameter of the inner pipe 86, and the roundness and smoothness of the inner and outer peripheral surfaces thereof.

In view of the above, the seal ring 93,
As for the outer pipe 85 and the inner pipe 86, the production cost is increased. Note that, in practice, there is a natural limit to achieving high accuracy in relation to cost, and therefore, when the outer pipe 85 and the inner pipe 86 slide relative to each other, it is assumed that the sliding load varies within a predetermined range. It was unavoidable. However, in some cases, the sliding load exceeded 3 kg, which was unsuitable for use.

The present invention has been made in view of the above circumstances, and enables relative sliding of an outer pipe and an inner pipe (that is, expansion and contraction operation as a suction pipe) to be performed lightly, and abrasion resistance of a seal ring. It is an object of the present invention to provide a connection structure of a suction pipe for a vacuum cleaner, which can improve the operability and can reduce the manufacturing cost.

[0010]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, in the connection structure of the suction pipe for a vacuum cleaner according to the present invention, the seal ring is provided with a plurality of annular pressure contact portions projecting outward in the radial direction at a plurality of locations in the axial direction. An annular flexure-permissible space corresponding to the press-contact portion of the seal ring is formed between the end of the pipe, which is inserted at the time of connection, and the periphery of the pipe.

With such a configuration, when the outer pipe and the inner pipe are relatively slid, the seal ring only keeps the state of being pressed against the inner peripheral surface of the outer pipe by its own elasticity. Instead, a deformation occurs such that the pressure contact portion itself is bent in accordance with the sliding direction and is pushed into the allowable space, and this deformation is preferably performed so that the pressure contact portion always maintains the pressure contact with the inner peripheral surface of the outer pipe. Will work.

Therefore, the sealing performance between the outer pipe and the inner pipe is improved. In addition, since the press contact portion is deformed with flexure, an appropriate press contact state is automatically maintained so that an overload is not generated in the sliding resistance, so that the elasticity (rubber hardness) of the seal ring is increased to some extent. It is also possible to increase (harden). This leads to the advantage that the sliding resistance between the outer pipe and the inner pipe can be reduced accordingly (expansion and contraction operation as a suction pipe can be performed lightly) and wear of the seal ring can be suppressed.

Further, since the press contact portion is deformed with bending as described above, the accuracy of the inner diameter of the outer pipe and the outer diameter of the inner pipe, the roundness and the smoothness of the inner and outer peripheral surfaces thereof are improved. In other words, it is possible to give a certain degree of tolerance in terms of gender and the like. This, of course, leads to lower production costs. In forming a flexure allowable space on the back side of the seal ring, the fitting portion of the seal ring in the pipe is formed by providing an annular concave portion corresponding to the press-contact portion, or the fitting portion of the pipe in the seal ring is formed. After reducing the diameter, it is formed by providing an annular ridge on a portion that does not correspond to the pressure contact portion, or by providing an annular ridge on a portion of the back of the seal ring where there is no pressure contact portion. can do.

The fitting portion of the seal ring is not limited to the end of the inner pipe on the side inserted into the outer pipe, but may be any one end as a suction pipe. By the way, on the outer surface of the inner pipe, a plurality of engaging recesses that can be engaged with the locking pieces of the input / output operation section are provided at predetermined intervals in the axial direction, and the outer pipe is brought close to the row in which the engaging recesses are formed. If a detent rail is provided to prevent relative rotation of
Regarding the manufacture of the inner pipe, the positioning of the engagement concave portion and the detent rail can be easily performed, and the shape becomes easy to cope with demolding, etc., and as a general tendency, simplification of manufacture and cost reduction can be achieved. Will be.

In this case, if the two rows of the detent rails are provided so as to sandwich the row of the engagement recesses from both sides, not only can the detent effect be strengthened accordingly, but also the row of the engagement recesses can be formed. Since the detent rails are symmetrically arranged around the center, there is also an advantage that a sense of stability in appearance and design can be obtained. In addition, the degree of proximity between the formation row of the engagement recesses and the detent rail can be brought close to each other within a range that does not adversely affect the shape and strength of both, and when the formation row of the engagement recesses is viewed in a plan view. The detent rail can be moved away as far as the viewing angle is.

Further, in the case of the outer pipe, if a cover for covering the in-out operation part is provided with a detent piece which penetrates the peripheral wall of the outer pipe and can be engaged with the detent rail of the inner pipe, The stopper piece can be formed in a plate shape having a sufficient size in the radial direction and the axial direction of the outer pipe, and is hardly damaged. Also, since the detent piece is not exposed outside the cover,
The advantage that the appearance is not deteriorated is also obtained.

This cover can give a sense of unity to the entire outer pipe including the in-and-out operation part, and not only improves the appearance, but also facilitates the assembly and mutual positioning of the outer pipe and the inner pipe. It also has the advantages that can be achieved. Further, in the inner pipe, an intermediate recess may be provided between the respective engagement recesses in order to suppress occurrence of a defect phenomenon such as sink during resin molding. In this case, it is preferable that the intermediate concave portion is formed so that its planar shape becomes a medium swelling shape. That is, in the case of the middle swelling shape, the adjacent distance in the axial direction between the circumferentially intermediate position of the engaging concave portion and the intermediate concave portion becomes narrower, and the adjacent distance in the axial direction becomes wider at the positions on both sides in the circumferential direction.

For this reason, when the engaging piece of the operating portion is engaged with the engaging recess, the engaging area is smaller (thinner) at both circumferential positions at the circumferentially intermediate position of the engaging recess. (Details will be described later), it is possible to prevent the strength against the load acting in the axial direction from being reduced at both circumferential positions. That is, if the intermediate concave portion is formed to have a middle swelling shape, the adjacent interval between the engaging concave portion and the intermediate concave portion can be lengthened at both circumferential positions where the engagement area is small (thin) as described above. That is, the strength can be increased with respect to the applied load.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a suction pipe 1 provided with a connecting portion structure according to the present invention includes an outer pipe 2.
And an inner pipe 3 that is slidably inserted into the outer pipe 2. The outer pipe 2 has an inner pipe 3 with respect to an end on the side where the inner pipe 3 enters and exits. An in / out operation unit 4 is provided for holding and controlling the degree of in / out.

The input / output operation unit 4 is covered by a cover 6. A structure for preventing relative rotation between the outer pipe 2 and the inner pipe 3 is incorporated in the cover 6. A seal ring 8 is fitted to the end of the inner pipe 3 on the side inserted into the outer pipe 2 so that air leakage or the like does not occur between the two pipes 2 and 3.

In such a suction pipe 1, for example, a flexible hose 82 (see FIG. 12) is connected to the end 1a on the outer pipe 2 side, and the suction head 81 is connected to the end 1b on the inner pipe 3 side. To be used. Therefore, the end 1a on the outer pipe 2 side is used as the insertion pipe end 9, and the end 1b on the inner pipe 3 side is used as the hook operating part 10, so that engagement and disengagement with the connection partner can be performed. Further, a hook 11 used for leaning on the cleaner body is provided at the end 1b on the inner pipe 3 side.

First, the in / out operation unit 4 will be described.
As shown in FIG. 1, the inflow / outflow amount operation unit 4 is supported by a fulcrum table 12 provided on the outer surface of the outer pipe 2 and a center fulcrum shaft 13 fitted on the fulcrum table 12 so as to be swingable. It has a lever 14 and an urging tool 15 for urging the operation lever 14 to one tilted state. A central fulcrum shaft 13 fitted on a fulcrum stand 12 is provided on the back surface of the cover 6.
A shaft retainer 16 is provided to prevent the arm from being escaped.

The outer pipe 2 is connected to one end of the operation lever 14.
A hook piece 18 is provided which is bent into a hook shape so as to be inserted into an opening 17 provided on the peripheral wall of the lock piece 1.
Reference numeral 8 allows the operation lever 14 to swing in and out of the opening 17 together with the swing of the operation lever 14. At the other end of the operation lever 14 is provided a button-type push operation unit 21 that protrudes outside through an operation port 20 opened in the cover 6.

On the other hand, a plurality of engaging recesses 24 are formed on the outer surface of the inner pipe 3 at predetermined intervals in the axial direction thereof (see FIGS. 4 and 5). Therefore, the operation lever 1
The inner pipe 3 is slid in the outgoing or incoming direction while pressing the push operating portion 21 of FIG. 4 to adjust its length. Then, the push operating portion 21 is released to engage the locking piece 18 with the engaging recess 24. By doing so, the sliding of the inner pipe 3 can be reliably stopped.

Next, a structure for preventing relative rotation provided inside the cover 6 will be described. As shown in FIGS. 4 and 5, the structure for preventing relative rotation is provided so as to be close to the formation row of the engagement recesses 24 provided on the outer surface of the inner pipe 3 and sandwich both sides of the formation row. 1 and 3, and a locking piece 27 protruding from the inner surface of the cover 6 radially inward from the inner surface of the cover 6 so as to correspond to each locking rail 26. I have.

The detent rail 26 has a stepped shape formed by cutting the outer surface of the inner pipe 3 into an L-shaped cross section. Needless to say, it may be formed as a groove having a certain depth. On the other hand, the detent piece 27 has a long plate shape in the axial direction, and is reinforced by a reinforcing rib 30. The reinforcing rib 30 passes through the through hole 31 formed in the peripheral wall of the outer pipe 2. It reaches the detent rail 26 of the inner pipe 3 and can be engaged therewith.

As shown in FIG. 1, the cover 6 is provided with an inwardly bent hook 33 at one end in the axial direction, and a screw insertion portion 34 at the upper surface at the other end. On the other hand, the outer pipe 2 is provided with positioning projections 35 and 36 for holding both ends of the cover 6, and one of the positioning projections 35 has a hook hole 37 into which the hook 33 is fitted.
The other positioning protrusion 36 is provided with the screw insertion portion 3.
4 is provided with a female screw portion 38.

Further, as shown in FIG. 3, insertion edges 40 are provided on both sides of the cover 6. On the other hand, the outer pipe 2 is provided with a swelling base 41 for supporting and continuously integrating both side portions of the cover 6, and the swelling base 41 is provided with a positioning port for receiving the insertion edge 40. 43 are provided. For this reason, the inner pipe 3 is fitted into the outer pipe 2, and the engaging piece 18 of the in-out / out operation unit 4 and the engaging recess 24 of the inner pipe 3 are matched, and then the positioning of the outer pipe 2 is performed. Just by assembling the cover 6 in a predetermined manner according to the projections 35 and 36 and the positioning port 43, the detent piece 27 necessarily engages with the detent rail 26 of the inner pipe 3 via the through-hole 31 of the outer pipe 2 ( A structure for preventing relative rotation is configured).

Therefore, in the suction pipe 1, relative sliding of the outer pipe 2 and the inner pipe 3 in and out is kept in a detented state. By the way, as shown in FIGS. 4 and 6, in the inner pipe 3, an intermediate recess 45 is provided between the respective engagement recesses 24 in order to suppress occurrence of a defect phenomenon such as sink during resin molding. Can be considered.

In this case, the planar shape of the intermediate concave portion 45 is such that the axially adjacent distance V to the intermediate concave portion 45 becomes narrower at the circumferentially intermediate position of the engaging concave portion 24, and the axially adjacent space V is located at both circumferential positions. It is preferable to form a middle swelling shape in which the interval W is widened. The intermediate recess 45 of the present embodiment includes:
Central rib 4 having a semicircular shape provided along the axial direction
6 on both sides.

That is, since the inner pipe 3 has a hollow circular cross section and the bottom surface of the engaging recess 24 is flat, the engaging recess 24 is deep at an intermediate position in the circumferential direction as shown in FIG. It is shallow on both sides. Therefore, when the locking piece 18 of the insertion / removal amount operation unit 4 is engaged with the engagement concave portion 24, the engagement area is large (thick) at the intermediate position in the circumferential direction of the engagement concave portion 24, and is large at the both side positions in the circumferential direction. Narrow (thin)
It means becoming.

Therefore, for example, the engagement recess 24 and the intermediate recess 4
Assuming that the circumferential position on both sides in the axial direction is also narrowed at the adjacent interval in the axial direction with respect to 5, and the same as the intermediate position in the circumferential direction (that is, both have V dimensions), the engagement area is small (thin). ), There is a possibility that the strength may be reduced with respect to the load acting in the axial direction. Eventually, in order to prevent such a decrease in strength, the plane shape of the intermediate concave portion 45 is formed to be a medium inflated shape.

That is, if the intermediate concave portion 45 is formed to have a middle swelling shape, the adjacent distance W between the two circumferential positions where the engaging area becomes small (thin) can be increased, and the strength against the load acting in the axial direction can be increased accordingly. Can be increased. The middle swelling shape of the intermediate recess 45 is shown in FIG.
As shown in FIG. 7A, the shape arranged on both sides of the central rib 46 can be triangular or trapezoidal as shown in FIG. 7B. Also, as shown in FIG.
It is also possible to form a diamond as shown in FIG.

As shown in FIG. 8, in the inner pipe 3, a seal ring 8 provided at an end to be inserted into the outer pipe 2 is fitted into an annular recess 48 formed in the inner pipe 3. The seal ring 8 has a plurality of pressure contact portions 50 in the axial direction. The annular concave portion 48 of the inner pipe 3 is provided with an inclined concave portion 51 by reducing the diameter on both sides in the axial direction corresponding to each press contact portion 43 of the seal ring 8. A flexure allowable space is formed on the back side of the ring 8.

In the inner pipe 3, the annular recess 48
The outer diameter of the (non-inclined concave portion 51) seal ring 8
Is slightly larger than the inner diameter of the seal ring 8 so that the fitting strength is increased with the seal ring 8 slightly extended in the circumferential direction. The axial length of the annular concave portion 48 can be appropriately changed from the viewpoint of making the fitting strength equal to or more than a predetermined value. However, if necessary, the seal ring 8 is adhered to the annular concave portion 48 (the portion other than the inclined concave portion 51). You may.

With such a structure, when the outer pipe 2 and the inner pipe 3 are relatively slid, the seal ring 8 is pressed against the inner peripheral surface of the outer pipe 2 by its own elasticity. In addition to the above, a deformation occurs such that the press contact portion 50 itself is bent in accordance with the sliding direction and is pushed into the allowable space, and this deformation causes the press contact portion 50 to press against the inner peripheral surface of the outer pipe 2. It will work favorably so that it is always maintained.

Accordingly, the sealing performance between the outer pipe 2 and the inner pipe 3 is improved. Moreover, the press contact portion 50
By deforming with bending, an appropriate pressure contact state is automatically maintained so that an overload does not occur in the sliding resistance, so that the elasticity of the seal ring 8 can be increased (hardened) to some extent. Will be possible. Therefore, there is an advantage that the sliding resistance between the outer pipe 2 and the inner pipe 3 can be reduced accordingly (expansion and contraction operation as the suction pipe 1 can be performed lightly) and wear of the seal ring 8 can be suppressed. In the present embodiment, the rubber hardness of the seal ring 8 is set to 70 °. In this case, the sliding resistance was 2.0 to 0.5 kg.

Further, since the press contact portion 50 is deformed with bending as described above, the accuracy of the inner diameter of the outer pipe 2 and the outer diameter of the inner pipe 3 (especially, in the annular concave portion 48), and the accuracy of the outer diameter of the outer pipe 2 and the inner pipe 3 (especially in the annular concave portion 48). -Regarding roundness and smoothness on the outer peripheral surface,
This means that some tolerance can be given. This, of course, leads to lower production costs. In addition,
In order to form a permissible deflection space on the back side of the seal ring 8, as shown in FIG.
May be reduced in diameter, and a ridge 54 may be provided at the central portion in the axial direction, or a ridge 55 may be provided on the back of the seal ring 8 as shown in FIG.

As shown in FIG. 11, the hook member 11 provided on the inner pipe 3 integrally has a tightening ring portion 57 having such a flexibility that it can be wound around and removed from the inner pipe 3. ing. A fastening portion 5 that can be fitted to the side surface of the hook 11 at an eccentric position of the inner pipe 3 is attached to the fastening ring 57.
8 are provided, and a screw 60 is
Is screwed into the inner pipe 3.

The side surface of the fastening portion 58 is formed straight along the axial direction of the inner pipe 3. Incidentally, the present invention is not limited to the above embodiment. For example, in the seal ring 8, the number of the pressure contact portions 50 provided is not limited, and may be three or more. Also, the cross-sectional shape of the press contact portion 50 in the protruding direction can be appropriately changed, such as a semicircle, a trapezoid, or a triangle.

The material of the seal ring 8 can be changed to a soft resin or the like. Further, the material of the outer pipe 2, the inner pipe 3, the cover 6, and the like is not limited, and may be a metal material such as aluminum. The present invention is applicable whether the suction head unit 81 (see FIG. 5) includes a power brush or not. In the case of supporting a power brush, a structure in which a power supply line, a signal line, and the like are buried in the peripheral wall portion of the outer pipe 2 and the inner pipe 3 may be used.

[0042]

As is apparent from the above description, in the connection structure of the suction pipe for a vacuum cleaner according to the present invention, an annular bending allowable space corresponding to the pressure contact portion is provided on the back side of the seal ring. Since the seal ring is formed, the seal ring not only retains the pressure contact state with the pressure contact partner due to its own elasticity, but also deforms such that the pressure contact portion itself bends as necessary and is pushed into the allowable space, and the pressure contact portion is deformed. The state is always maintained suitably.

Accordingly, even at a portion where sliding resistance occurs, such as an end of the inner pipe on the side inserted into the outer pipe, a reliable sealing property can be obtained. Then, since the press-contact portion is deformed by bending, an appropriate press-contact state is automatically maintained so that an overload is not generated in the sliding resistance. Therefore, the elasticity (rubber hardness) of the seal ring is increased to some extent. It is possible to increase (harden). Therefore, the sliding resistance can be reduced accordingly,
This leads to an advantage that wear as a seal ring can be suppressed.

Not only that, the tolerance of the accuracy of the inner diameter of the outer pipe and the outer diameter of the inner pipe, but also the degree of roundness and smoothness of the inner and outer peripheral surfaces thereof is allowed to some extent. This also leads to lower costs.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view showing a main part (an operation portion of an outer pipe) of a suction pipe according to the present invention.

FIG. 2 is an exploded side view of the suction tube according to the present invention.

3 is an exploded front view showing an outer pipe and a cover (FIG. 1)
(Corresponding to the line AA of FIG. 1).

FIG. 4 is an enlarged plan view of a main part of an inner pipe.

FIG. 5 is an enlarged sectional view taken along line BB of FIG. 4;

FIG. 6 is an enlarged sectional view taken along line CC of FIG. 4;

FIG. 7 is a plan view showing another embodiment of the intermediate concave portion.

FIG. 8 is an enlarged side view showing a half section of an end of the inner pipe on the side inserted into the outer pipe.

FIG. 9 is a sectional view of a principal part showing another embodiment of the seal ring.

FIG. 10 is a sectional view of a main part showing still another embodiment of the seal ring.

FIG. 11 is an enlarged sectional view taken along line DD of FIG. 2;

FIG. 12 is a perspective view showing a state of use in a conventional suction tube.

FIG. 13 is an exploded perspective view showing a rotation stopping structure of a conventional suction pipe in a partially crushed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner suction pipe 2 Outer pipe 3 Inner pipe 4 In / out operation part 6 Cover 8 Seal ring 18 Engagement piece 24 Engagement concave part 26 Twist stop rail 27 Twenty stop piece 45 Intermediate concave part 50 Pressure contact part 51 Depression (inclined concave part) 54 ridges (provided on inner pipe) 55 ridges (provided on seal ring)

Claims (6)

[Claims] 1. A connection part of a suction pipe for a vacuum cleaner, wherein a seal ring (8) is fitted around an end of a pipe (3) which is inserted at the time of connection. An annular pressure contact portion (50) protruding outward in the radial direction is provided at a plurality of positions in the axial direction, and between the back side of the seal ring (8) and the pipe (3),
A connection part structure of a suction pipe for a vacuum cleaner, wherein an annular bending allowable space corresponding to a pressure contact part (50) of a seal ring (8) is formed. 2. The bending allowable space is provided at a fitting portion of a seal ring (8) in a pipe (3) at a press contact portion (50).
The connection structure of a suction tube for a vacuum cleaner according to claim 1, wherein the connection portion is formed by providing an annular concave portion (51) corresponding to (1). 3. The deflection allowable space reduces the diameter of the fitting portion of the pipe (3) where the seal ring (8) is fitted, and forms an annular ridge (5) at a portion that does not correspond to the press contact portion (50).
The connecting part structure for a suction pipe for a vacuum cleaner according to claim 1, wherein the connecting part is formed by providing (4). 4. The deflection allowable space reduces a diameter of a fitting portion of a seal ring (8) in a pipe (3) and a press contact portion (50) on a back portion of the seal ring (8).
2. The connection structure for a suction pipe for a vacuum cleaner according to claim 1, wherein the connection section is formed by providing an annular ridge (55) in a portion where there is no protrusion. 5. The vacuum cleaner suction pipe (1) has an outer pipe (2) and an inner pipe (3) slidably inserted into the outer pipe (2). Seal ring (8)
The connection of a suction pipe for a vacuum cleaner according to any one of claims 1 to 4, wherein the connection is provided at an end of the inner pipe (3) on a side to be inserted into the outer pipe (2). Part structure. 6. An outer pipe (2), and an inner pipe (3) having a hollow circular cross-sectional shape slidably inserted into the outer pipe (2). An insertion / removal amount operation unit (4) is provided for holding the locking piece (18) so as to be able to move back and forth toward the inner pipe (3), and the end of the inner pipe (3) on the side inserted into the outer pipe (2). Seal ring on part (8)
In the connection structure of the suction pipe for a vacuum cleaner, the engagement concave portion (24) engageable with the locking piece (18) of the in-out / out operation part (4) is provided on the outer surface of the inner pipe (3). ) Are provided at a predetermined interval in the axial direction, and two blocks for preventing relative rotation with the outer pipe (2) in a close range sandwiching both sides in the formation row of the engagement recesses (24). A detent rail (26) is provided, and an intermediate recess (45) is further provided between the engaging recesses (24). The planar shape of the intermediate recess (45) is the same as that of the engaging recess (24). At the intermediate position in the circumferential direction, the intermediate concave portion (4
5) is formed into a middle swelling shape in which the axial adjacent distance (V) is narrower and the axial adjacent distance (W) is wider at both circumferential positions, and the outer pipe (2) has an inflow / outflow amount. A cover (6) that covers the operation unit (4) is detachably provided, and the cover (6) penetrates the peripheral wall of the outer pipe (2) and is attached to the detent rail (26) of the inner pipe (3). A detent piece (27) that can be engaged is provided. The seal ring (8) is provided with a plurality of press-contact portions (50) projecting radially outward in a ring shape at a plurality of locations in the axial direction. ,
An annular concave portion (51) is provided in the pipe (3) at a portion where the seal ring (8) is fitted, corresponding to the pressure contact portion (50) of the seal ring (8). (8) A connection structure of a suction pipe for a vacuum cleaner, wherein a permissible space is formed on the back side of the suction pipe.