KR200437730Y1 - Extension pipe for vacuum cleaner - Google Patents

Abstract

The present invention relates to an extension tube for a vacuum cleaner in which the maximum length to be stretched is the same as the conventional one but the minimum length to be shrunk is smaller than the conventional one, and the configuration thereof includes: a first-stage pipe having the largest diameter; It is inserted slidably inside the first stage pipe and is formed to be slidably inserted in the second stage pipe having a plurality of stopper protrusions arranged in a line along the longitudinal direction on the outer circumferential surface thereof and along the longitudinal direction on the outer circumferential surface thereof. Comprising a three-stage pipe formed with a plurality of stopper grooves in a row, and fixed to the first-stage pipe, a second stage pipe is inserted through the inside, the first control knob is inserted and coupled to the outside, the second stage And a first guide tube having an elastic catching piece which is caught by the stopper projection of the pipe to fix the second stage pipe. The first guide tube is fixed to the second stage pipe, and the third stage pipe is inserted through the interior thereof. 2 adjustment knob is inserted and coupled, the elastic engaging piece is fixed to the three-stage pipe is caught in the stopper groove of the three-stage pipe And a second guide tube.

Vacuum cleaner, extension tube, length adjustment, three stages, pipe, stopper projection, stopper groove.

Description

Extension pipe for vacuum cleaner {EXTENSION PIPE FOR VACUUM CLEANER}

1 is an exploded perspective view of an extension tube according to the present invention.

Figure 2a and 2b is a side cross-sectional view showing an exploded state of the extension pipe according to the present invention, Figure 2a is a view showing the configuration of the connection of the first and second pipe pipe, Figure 2b is a two-stage pipe and three-stage pipe Drawing showing the connection configuration.

Figure 3a and 3b is a side cross-sectional view showing a combined state of the first stage pipe and the second stage pipe, Figure 3a is a fixed state by adjusting the length of the second stage pipe, Figure 3b is a state of adjusting the length of the second stage pipe Shown.

4A is an enlarged cross-sectional view taken along the line A-A 'of FIG. 3A, and FIG. 4B is an enlarged cross-sectional view taken along the line B-B' of FIG. 3B.

Figure 5a and 5b is a side cross-sectional view showing a combined state of the two-stage pipe and the three-stage pipe, Figure 5a is a fixed state by adjusting the length of the three-stage pipe, Figure 5b is a state of adjusting the length of the three-stage pipe Shown.

6A is an enlarged cross-sectional view taken along the line C-C 'of FIG. 5A, and FIG. 6B is an enlarged cross-sectional view taken along the line D-D' in FIG. 5B.

Figure 7 is a view showing a length adjustment state of the extension tube according to the present invention, (A) the drawing is a state contracted to the minimum length, (B) the drawing is extended to a two-stage length only three-stage pipe, (C The drawing is extended to the maximum length by extending the 2nd and 3rd pipes.

<Description of Major Symbols in Drawing>

10: one-stage pipe 10a, 24, 34: engaging projection

12: 1st guide pipe 12a, 22a: elastic latching piece

12b, 22b: close contact 12c, 22c, 25a, 35a: coupling hole

12d: guide groove 13: first adjustment knob

13a: Pressing portion 13b: Release groove

20: two-stage pipe 21: stopper projection

22: 2nd guide pipe 22d: guide protrusion

23: second adjusting knob 25, 35: packing

30: three-stage pipe 31: stopper groove

33: guide rail S1, S2: support ring

The present invention relates to an extension tube for a vacuum cleaner, and in particular, the maximum length of the elongation is the same as the conventional, but the minimum length of the contraction can be made smaller than the conventional, thereby making the size of the packaging box smaller, It relates to a vacuum cleaner extension tube that can be used to adjust the length according to the user's height and habits.

In general, an extension tube which is connected to the vacuum cleaner main body and functions as a suction tube that sucks in dust and the like has a two-stage structure in which two pipes having different diameters are connected. That is, a small diameter pipe is slidably inserted into the large diameter pipe to fix the entry and exit of the small diameter pipe by the stopper means, so that the user can adjust the length to a desired length and clean it in a comfortable posture. .

Since the extension tube of the conventional two-stage structure consists of two pipes, the packaging box can be large because the reduced length can only be reduced by about 1/2 compared to the state in which it is extended to the maximum length. There was only a problem.

Since the conventional two-stage extension tube had to be manufactured by packing a large size of the packing box, there was a waste of packing material and the size of the packing box was large, thereby limiting the amount of temporary storage in the storage warehouse. In addition, there is also a problem in that the amount of loading in the loading box of the transport vehicle is less, so the logistics movement costs are also required.

On the other hand, the conventional extension pipe is made of two pipes by the locking means (or stopper groove) formed only in one pipe that is slidably inserted, so that the elongated or contracted state is fixed, the length can be adjusted so The adjustable range can be adjusted only by the stopper formed on one pipe, that is, the length within the range corresponding to 1/2 of the state extended to the maximum length, so that the length can be adjusted according to the user's height and usage habit. There was no problem.

The present invention is to solve the above-mentioned problems of the prior art, the purpose is to increase the maximum length is the same as the conventional, but the minimum length of the shrinkage can be smaller than the conventional, thereby increasing the size of the packaging box accordingly It is to provide an extension tube for a vacuum cleaner that can be made small.

In addition, another object of the present invention is to provide an extension tube for the vacuum cleaner that can be used to adjust the length according to the user's height and habit.

In order to achieve the above object, the vacuum tube extension tube according to the present invention includes a first stage pipe having a largest diameter; A two-stage pipe slidably inserted inside the first-stage pipe and having a plurality of stopper protrusions arranged in a line along a longitudinal direction on an outer circumferential surface thereof; And a three-stage pipe slidably inserted in the two-stage pipe and having a plurality of stopper grooves formed in a line along the longitudinal direction on the outer circumferential surface thereof, and fixed to the first-stage pipe and passing through the inside thereof. The first adjustment knob is inserted and coupled to the outside while the two-stage pipe is inserted, and includes a first guide tube having an elastic catching piece that is caught by the stopper protrusion of the two-stage pipe to fix the two-stage pipe. It is fixed to the end pipe, and the third adjustment pipe is inserted through the inside of the second adjustment knob is inserted and coupled to the outside, and is caught in the stopper groove of the three-stage pipe is provided with an elastic engaging piece for fixing the three-stage pipe And a second guide tube.

On the inner circumferential surface of the first adjustment knob, a pressing portion for pressing the elastic locking piece of the first guide tube is formed, and both sides of the pressing portion are formed with a recessed release groove so as to be accommodated while the elastic locking piece is bent, and the second adjustment knob In the inner circumferential surface of the, the pressing portion for pressing the engaging portion of the elastic locking piece of the second guide tube is formed, it is preferable that both of the pressing portion is formed with a recessed groove concave.

In addition, the first guide tube and the second guide tube may be configured to further include a support ring which is positioned and supported at the cut end of the elastic engaging piece formed in the guide.

In addition, a close contact with the inner circumferential surface of the first adjusting knob is formed on the circumferential portion of the outer peripheral surface of the first guide tube, and a close contact with the inner circumferential surface of the second adjusting tube is fixed on the circumferential surface of the second guide tube outer peripheral surface. It is preferable that it consists of what has a close contact.

In addition, it is preferable that the end of the two-stage pipe inserted into the first stage pipe and the end of the three-stage pipe inserted into the two-stage pipe, each of which comprises a packing is combined.

In addition, a guide groove into which a stopper protrusion of a two-stage pipe is fitted in a longitudinal direction is formed on an inner circumferential surface immediately below the portion where the elastic engaging piece of the first guide tube is formed, and a guide rail is formed in the three-stage pipe along a longitudinal direction. It is preferable that the inner surface of the second guide tube includes a guide protrusion formed in accordance with the guide rail.

In addition, it is preferable that the stopper protrusion formed on the outer circumferential surface of the two-stage pipe and the stopper groove formed on the outer circumferential surface of the three-stage pipe are different from each other.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail the present invention.

1 is an exploded perspective view of an extension tube according to the present invention, Figures 2a and 2b is a side cross-sectional view showing an exploded state of the extension tube according to the present invention, Figure 2a is a view showing the configuration of the connection of the first and second pipe pipes 2B is a view showing the configuration of the connection portion of the second stage pipe and the third stage pipe.

As shown in Figures 1 to 2b, the extension tube according to the present invention is extended to the maximum length is the same as the length that is extended to the maximum length of the extension tube made of a conventional two-stage structure while the minimum length is the conventional one It is characterized by being constructed with three pipes in order to make it shorter and to reduce the volume of the packing box.

To this end, the first stage pipe 10 having the largest diameter, the second stage pipe 20 which is slidably inserted inside the first stage pipe 10, and the slidably inserted inside the second stage pipe 20. Is provided with a three-stage pipe 30, the first guide pipe 12 including the first guide pipe 12 coupled to the connecting portion of the first pipe 10 and the second pipe 20, the outer side of the first guide pipe 12 A first control knob 13 inserted into the second guide pipe 22 and a second guide pipe 22 coupled to the connection portion between the second pipe 20 and the third pipe 30. The second control knob 23 is inserted into the outside.

One end of the first stage pipe 10 is connected in one-touch manner with a connecting tube integrated with a handle (not shown) connected to the vacuum cleaner main body, and the other end has a coupling protrusion 10a protruding inward. .

The first guide tube 12 has a coupling hole (12c) corresponding to the coupling protrusion (10a) of the first-stage pipe (10) is fixed to the first-stage pipe (10), a portion of the outer peripheral surface is cut off An elastic locking piece 12a having a locking portion protruding inward and outward is formed at the site, and a close contact 12b closely contacting the inner circumferential surface of the first adjustment knob 13 to be described later is formed on a circumference of the outer circumferential surface. Formed.

The first guide tube 12 fixed to the first stage pipe 10 is located and coupled to the inside of the first adjustment knob 13, and the second stage pipe 20 opens the inside of the first guide tube 12. Through it, it becomes slidable inside the 1st stage pipe 10.

The first adjustment knob 13 is used to extend or contract the length of the two-stage pipe 20, the inner peripheral surface protruding in the outward direction of the elastic engaging piece (12a) of the first guide tube 12 The pressing portion 13a is formed to be equal to or slightly larger than the width of the locking portion, and the release grooves 13b are formed in both recesses of the pressing portion 13a.

The pressing portion 13a substantially coincides with the inner circumferential surface diameter of the first adjusting knob 13 and fits with the upper surface of the locking portion protruding outwardly of the elastic locking piece 12a provided in the first guide tube 12. The release groove 13b is a portion to which the engaging portion projecting outwardly is received when the elastic engaging piece 12a is bent upward.

The two-stage pipe 20 has a plurality of stopper protrusions 21 formed in a line along the longitudinal direction on the outer circumferential surface thereof, and the interval between the stopper protrusions 21 adjacent to each other is provided in the first guide tube 12. It is formed to fit the size of the locking portion protruding toward the inner direction of the elastic locking piece (12a).

Meanwhile, a guide groove 12d into which the stopper protrusion 21 of the two-stage pipe 20 is fitted in the longitudinal direction is formed on the inner circumferential surface immediately below the portion where the elastic engaging piece 12a of the first guide tube 12 is formed. This is preferred. This is for the second stage pipe 20 to be rotated so that the position of the stopper protrusion 21 does not change (see FIGS. 4A and 4B).

The structure of the 2nd guide pipe 22 and the 2nd adjustment knob 23 couple | bonded with the connection part of the 2nd pipe | tube 20 and the 3rd pipe | tube 30 is the 1st guide pipe | tube 12 and 1st adjustment which were demonstrated above. It is almost similar to the structure of the knob 13.

That is, the second adjusting knob 23 has a pressing portion 23a and a releasing groove 23b formed on the inner circumferential surface thereof in the same way as the structure of the first adjusting knob 13, and the second guide pipe 22 Similarly to the structure of the first guide tube 12, the protruding jaw 22b closely contacting the inner circumferential surfaces of the elastic engaging piece 22a and the second adjustment knob 23 and the other end of the two-stage pipe 20 protrude inward. A coupling hole 22c corresponding to the coupling protrusion 20a is formed, so that the second guide pipe 22 is fixed to the two-stage pipe 20.

On the other hand, on the outer circumferential surface of the three-stage pipe 30 is formed a plurality of stopper grooves 31 in a row along the longitudinal direction, and a guide rail 33 recessed in the longitudinal direction on one side of the inner circumferential surface is formed have.

Here, the guide protrusion 22d corresponding to the guide rail 33 of the three-stage pipe 30 is formed on the inner circumferential surface of the second guide tube 22, and the guide rail 33 of the three-stage pipe 30 is formed. Since the guide protrusion 22d of the second guide tube 22 is fitted, the three-stage pipe 30 rotates so that the position of the stopper groove 31 does not change.

The second guide tube 22 has the same structure as that of the first guide tube 12, and if there is a difference, the first guide tube 12 has a two-stage pipe (2) to prevent rotation of the two-stage pipe 20. While the guide groove 12d corresponding to the stopper protrusion 21 of 20 is formed, the guide of the first stage pipe 30 is prevented in the second guide tube 22 to prevent rotation of the first stage pipe 30. Only the point where the guide protrusion 22d corresponding to the rail 33 is formed is partially different.

The second guide tube 22 fixed to the two-stage pipe 20 is located and coupled to the inside of the second adjustment knob 23, and the three-stage pipe 30 opens the inside of the second guide tube 22. Pass through and is slidably coupled inside the two-stage pipe (20).

On the other hand, it is preferable to combine and fix the packing (25, 35) to the ends of the two-stage pipe (20) and the three-stage pipe (30), the packing 25 is in close contact with the inner peripheral surface of the first-stage pipe (10) It serves to seal the gap between the inner circumferential surface of the first stage pipe (10) and the outer circumferential surface of the second stage pipe (20) to prevent the suction force of the vacuum cleaner from escaping to the outside. It serves to seal the gap between the 20 and the three-stage pipe (30).

Here, the packings 25 and 35 are in close contact with the inner circumferential surfaces of the first and second pipes 10 and 20, and the second and second pipes 20 and 30 may be smoothly slid. In order to ensure that it is preferably formed of a synthetic resin or rubber material having a certain degree of elasticity.

Coupling holes 25a and 35a are formed in the packings 25 and 35, respectively, and coupling protrusions 24 and 2 corresponding to the coupling holes 25a and 35a are formed in the two-stage pipe 20 and the three-stage pipe 30, respectively. 34 is formed so that the coupling protrusions 24 and 34 are inserted into and coupled to the coupling holes 25a and 35a to seal the packing 25 and 35 of the two-stage pipe 20 and the three-stage pipe 30, respectively. It will be fixed at the end.

Since the elastic catching pieces 12a and 22a provided in the first guide tube 12 and the second guide tube 22 described above are elastically bent every time the length of the extension tube according to the present invention is adjusted, the most force The support ring (S1, S2) can be combined to be positioned at the cut end of the receiving portion, that is, each of the elastic engaging pieces (12a, 22a).

The support rings (S1, S2) is to support the portion receiving the most force of the elastic locking piece (12a) to prevent the elastic locking piece (12a) to be broken by supporting a portion that is repeatedly bent will be.

On the other hand, the stopper protrusion 21 protruding outward without forming a groove inward like the stopper groove 31 of the 3-stage pipe 30 is formed in the two-stage pipe 20. This is because if the stopper groove is formed inwardly in 20, the sliding may not be performed smoothly due to interference caused by the stopper groove formed inward when the three-stage pipe 30 is slid inside the two-stage pipe 20.

On the other hand, by forming the outer diameter of the three-stage pipe 30 to match the inner diameter of the two-stage pipe 20, that is, the step (difference in diameter between the two-stage pipe 20 and the three-stage pipe 30) It is also intended to make) as small as possible.

Figure 3a and 3b is a side cross-sectional view showing a combined state of the first stage pipe and the second stage pipe, Figure 3a is a fixed state by adjusting the length of the second stage pipe, Figure 3b is a state of adjusting the length of the second stage pipe 4A is an enlarged cross-sectional view taken along the line A-A 'of FIG. 3A, and FIG. 4B is an enlarged cross-sectional view taken along the line B-B' of FIG. 3B, and FIGS. 5A and 5B show a combined state of the two-stage pipe and the three-stage pipe. As shown in the cross-sectional side view, Figure 5a is a fixed state by adjusting the length of the three-stage pipe, Figure 5b is a view showing a state of adjusting the length of the three-stage pipe, Figure 6a is an enlarged cross-sectional view of the line C-C 'of FIG. 6B is an enlarged cross-sectional view taken along the line D-D 'of FIG. 5B.

The method of adjusting and fixing the lengths of the second pipe 20 and the third pipe 30 is the same. First, a method of adjusting and fixing the length of the second pipe 20 is described with reference to FIGS. 3A to 4B. do.

Referring to FIGS. 3A and 4A, although the length of the second stage pipe 20 is adjusted and fixed, the position of the pressing portion 13a of the first adjusting knob 13 is elastically caught by the first guide tube 12. When it is adjusted and moved so as to be positioned directly above the piece 12a, the elastic engaging piece 12a is caught between the stopper protrusion 21 and the stopper protrusion of the two-stage pipe 20 by the pressing part 13a. Therefore, the two-stage pipe 20 is no longer moved by the stopper protrusion 21, and maintains its fixed state. That is, the two-stage pipe 20 cannot move in both left and right directions as seen from the drawing.

3B and 4B, the method for adjusting the length of the two-stage pipe 20 is to hold the first adjusting knob 13 with one hand and move it in one direction to press the pressing portion 13a of the first adjusting knob 13. ) In the contracted or extended direction by holding the two-stage pipe 20 with the other hand, with the release position 13b positioned above the elastic locking piece so as to be out of the elastic locking piece 12a. When a force is applied toward the left arrow direction indicated in the first stage pipe or the right arrow indicated in the second stage pipe in 3b, the second stage pipe 20 moves in the direction in which the force is applied and the elastic engagement piece ( 12a is bent into the upper groove by the stopper protrusion 21 of the two-stage pipe 20 while being accommodated in the release groove 13b of the first adjustment knob 13.

Thus, as the elastic engaging piece 12a of the first guide tube 12 is accommodated in the release groove 13b of the first adjustment knob 13, the length of the second stage pipe 20 can be freely increased as desired. Can be reduced or reduced. That is, even when the stopper protrusions 21 pass through the lower portion of the elastic catching piece 12a while moving in the direction of the force given to the second stage pipe 20, the release groove 13b located at the upper portion of the elastic catching piece 12a is provided. Since the elastic locking piece 12a is not caught on the stopper protrusion 21 while being elastically bent and accommodated, the second stage pipe 20 can be moved to adjust the desired length while applying the force.

Then, in order to fix the state in the state adjusted to the desired length, the first adjustment knob 13 is moved again in the opposite direction so that the position of the pressing portion 13a of the first adjustment knob 13 is the elastic engaging piece 12a. When positioned at the upper portion of the two-stage pipe, because the pressing portion (13a) is held between the stopper projection 21 and the stopper projection of the two-stage pipe (20) while pressing the elastic engaging piece 12a. The fixed state of 20 is maintained.

Next, a method of adjusting and fixing the length of the three-stage pipe 30 with reference to FIGS. 5A to 6B is the same as the method of adjusting and fixing the length of the two-stage pipe 20 described above. .

Referring to FIGS. 5A and 6A, the length of the three-stage pipe 30 is adjusted and fixed, and the position of the pressing portion 23a of the second adjusting knob 23 is elastically caught by the second guide tube 22. When it is located just above the piece 22a, the elastic engaging piece 22a is caught by the stopper groove 31 of the three-stage pipe 30 by the pressing portion 23a, and the three-stage pipe 30 is elastic. The locking piece 22a no longer moves and maintains the fixed state. That is, the three-stage pipe 30 cannot move in both left and right directions as shown in the drawings.

5B and 6B, the method of adjusting the length of the three-stage pipe 30 is to hold the second adjusting knob 23 with one hand and move it in one direction to press the pressing portion 23a of the second adjusting knob 23. ) In the contracted or extended direction by holding the three-stage pipe 30 with the other hand while the position is released from the elastic locking piece 22a so that the release groove 23b is positioned on the upper portion of the elastic locking piece 22a. In the direction of the left arrow shown in the second-stage pipe or in the direction of the right arrow shown in the third-stage pipe), the three-stage pipe 30 moves in the direction in which the force is applied and the elastic engaging piece 22a moves. ) Is in the state accommodated in the release groove 23b of the second adjustment knob 23 while being bent upwardly by riding the outer circumferential surface while leaving the stopper groove 31 of the three-stage pipe 30.

Thus, as the elastic engaging piece 22a of the second guide tube 22 is accommodated in the release groove 23b of the first adjustment knob 23, the length of the three-stage pipe 30 can be freely increased as desired. Can be reduced or reduced. That is, even when the stopper grooves 31 pass under the elastic locking piece 22a while moving in the direction of the force given to the three-stage pipe 30, it is elastic to the release groove 23b located at the top of the elastic locking piece 22a. Since the elastic engaging piece 22a is not caught in the stopper groove 31 while being accommodated as described above, the second stage pipe 20 may be continuously moved while applying a force, thereby adjusting the desired length.

And in order to fix the state in the state adjusted to the desired length, the position of the pressing part 23a of the 2nd adjustment knob 23 is moved to the opposite direction again, and the position of the elastic latching piece 22a If the upper position of the), the pressing portion (23a) is in the state of pressing the elastic engaging piece (22a) is being caught in the stopper groove 31 of the three-stage pipe (30) while the three-stage pipe (30) The fixed state of is maintained.

On the other hand, when adjusting the length of the three-stage pipe 30, the position of the packing 35 fixed to the end of the three-stage pipe 30 is located between the stopper protrusion 21 and the stopper protrusion of the second-stage pipe 20. Preferably, the packing 35 is always in close contact with the inner circumferential surface of the stopper protrusion 21 formed in the second stage pipe 20 so that the gap between the inner circumferential surface of the two-stage pipe 20 and the outer circumferential surface of the three-stage pipe 30. By preventing the gap from occurring, the sealing function of the packing 35 may be properly performed to prevent the suction force of the vacuum cleaner from escaping to the outside.

Figure 7 is a view showing a length adjustment state of the extension tube according to the present invention, (A) the drawing is a state contracted to the minimum length, (B) the drawing is extended to a two-stage length only three-stage pipe, (C The figure shows a state in which the second and third pipes are extended to their maximum length.

Since the present invention is connected in a three-stage structure, as shown in (a), the length can be reduced to about one third in the state of being contracted to the minimum length as compared to the state of being stretched to the maximum length.

Therefore, the conventional extension pipe made of a two-stage structure can be reduced to about 1/2 of the state of the elongated length to the maximum length in the contracted state to the minimum length, but the packaging box was unnecessarily large, but the extension pipe according to the present invention In the state of shrinking to the minimum length, the length can be reduced more than the conventional one, so that the size of the packing box can be made smaller than the conventional one, so that the waste of the packaging material can be reduced, and the size of the packing box is smaller, so that the transport vehicle Since it can be loaded more in the cargo compartment of the logistical transfer costs can be reduced accordingly.

On the other hand, the extension tube of the conventional two-stage structure can be adjusted only the length within the range corresponding to 1/2 of the state extended to the maximum length because the length that can adjust the length is only by the stopper formed in the inner pipe. On the contrary, the present invention corresponds to two thirds of the two-stage pipe 20 and the three-stage pipe 30 formed with the stopper protrusion 21 and the stopper groove 31, respectively. It can be freely adjusted to the desired length within the range can be adjusted to a finer length than the conventional one.

That is, the present invention has a larger range in which the user can fit the desired length as compared with the conventional one. For example, in the case of a short child who wants to use the vacuum cleaner to remove the mother's hands, the second pipe 20 of the drawing (b) is maximized from the minimum length of the drawing in FIG. It can be used to adjust the length to the desired length up to the length of the extended state, in the case of adults have the advantage that can be used to suit the length that best suits you according to your height and habits.

Meanwhile, as shown in FIG. 1, the stopper protrusion 21 and the stopper groove 31 are formed at regular intervals on the outer circumferential surfaces of the two-stage pipe 20 and the three-stage pipe 30, respectively. , So that the interval between the stopper protrusion 21 and the stopper protrusion and the stopper groove 31 and the stopper groove are equal to each other so that the lengths of the second pipe 20 and the third pipe 30 are moved by the same length, respectively. You can also adjust the length freely.

As shown in FIG. 7 (c), the distance between the stopper protrusion 21 of the second stage pipe 20 and the stopper groove 31 of the first stage pipe 30 may be different from each other. Since the gap between the stopper protrusion 21 and the stopper protrusion can only be formed in the two-stage pipe 20 in accordance with the size of the elastic catching piece 12a, the two stopper protrusions 21 adjacent to each other form a pair. By successively arranging at intervals to some extent, it is possible to have a larger width of the length to be adjusted, on the contrary, the spacing of the stopper groove 31 of the three-stage pipe 30 is densely arranged to finely adjust the length. Of course it can also be possible.

As such, when the stopper protrusion 21 of the second pipe 20 and the stopper groove 31 of the first pipe 30 are formed to be different from each other, the second pipe 20 has a large width of an adjustable length. The length adjustment can be quickly adjusted in just a few steps, finer length adjustment can be adjusted with a three-stage pipe (30).

As described above with reference to the drawings illustrated for the vacuum cleaner extension tube according to the present invention, the present invention is not limited by the embodiments and drawings disclosed herein, those skilled in the art within the scope of the technical idea of the present invention Of course, various modifications may be made.

According to the vacuum cleaner extension tube according to the present invention made of the configuration as described above, because the present design consists of three stages, the minimum length can be further reduced compared to the extension tube made of a conventional two-stage structure to reduce the size of the packaging box Since it can be made smaller than before, not only waste of packaging materials can be reduced, but also the size of the packaging box can be reduced, so that it can be loaded more in the loading box of the transport vehicle, and thus, the logistics movement cost can be reduced together. Can be.

In addition, the present invention has a stopper projection and a stopper groove are formed in both the two-stage pipe and the three-stage pipe, respectively, so that the user can have a longer length than the conventional two-stage extension tube to fit the desired length, so that the child You can also use a vacuum cleaner, and even adults, there is an advantage that can be used to suit the length that best suits you, depending on your height and habits.

In addition, the present invention is different from the distance between the stopper projection of the two-stage pipe and the stopper groove of the first-stage pipe, the two-stage pipe has a large width of the adjustable length so that the length adjustment can be made only a few steps, it can be quickly adjusted And finer length adjustment can get the effect that can be adjusted by three-stage pipe.

Claims (7)

First stage pipe 10 having the largest diameter; A two-stage pipe (20) slidably inserted inside the one-stage pipe (10) and having a plurality of stopper protrusions (21) formed in a row along its longitudinal direction on its outer circumferential surface; And Including the three-stage pipe 30 is slidably inserted in the two-stage pipe 20 and a plurality of stopper grooves 31 are formed in a line along the longitudinal direction on the outer peripheral surface thereof, The first adjusting knob 13 is inserted and coupled to the outside while the second adjusting pipe 13 is fixed to the first stage pipe 10 and the second stage pipe 20 is inserted thereinto, so that the stopper protrusion of the second stage pipe 20 And a first guide tube 12 provided with an elastic catching piece 12a which is caught by 21 to fix the two-stage pipe 20, The second adjusting knob 23 is inserted and coupled to the outside while being fixed to the second pipe 20, and the third pipe 30 is inserted through the inside thereof, so that the stopper groove (3) of the third pipe 20 is inserted and coupled thereto. 31) The vacuum tube extension tube comprises a second guide tube (22) provided with an elastic catching piece (22a) to be fixed to the three-stage pipe (30). The method of claim 1, On the inner circumferential surface of the first adjustment knob 13, a pressing portion 13a for pressing the elastic engaging piece 12a of the first guide tube 12 is formed, and the elastic locking portion is formed on both sides of the pressing portion 13a. The recessed release groove 13b is formed so that the piece 12a may be bent and accommodated, On the inner circumferential surface of the second adjustment knob 23, pressing portions 23a for pressing the locking portions of the elastic locking pieces 22a of the second guide tube 12 are formed, and both pressing portions 23a are recessed. Extension tube for vacuum cleaner, characterized in that the release groove (23b) is formed. The method of claim 1, The first guide tube 12 and the second guide tube 22 further includes a support ring (S1, S2) that is positioned and supported at the cut end of the elastic engaging pieces (12a, 22a) formed in the coupled Extension tube for vacuum cleaner made. The method of claim 1, On the circumference of a certain portion of the outer circumferential surface of the first guide tube 12 is formed a close contact 12b in close contact with the inner circumferential surface of the first adjustment knob 13, Extension tube for vacuum cleaner comprising a close contact with the inner circumferential surface of the second control knob 23 is formed on a circumferential portion of the outer circumferential surface of the second guide tube (22). The method of claim 1, Packings 25 and 35 are respectively provided at the end of the second-stage pipe 20 inserted into the first-stage pipe 10 and the ends of the three-stage pipe 30 inserted into the second-stage pipe 20. Extension tube for vacuum cleaner comprising the combined. The method of claim 1, A guide groove 12d into which the stopper protrusion 21 of the two-stage pipe 20 is fitted in the longitudinal direction is formed on an inner circumferential surface immediately below the portion where the elastic engaging piece 12a of the first guide tube 12 is formed, The three-stage pipe 30 has a guide rail 33 is formed long along the longitudinal direction, and the guide projection 22d is formed on the inner surface of the second guide pipe 22 to fit the guide rail 33 Extension tube for vacuum cleaner comprising a. The method of claim 1, The stopper protrusion 21 formed on the outer circumferential surface of the two-stage pipe 20 and the stopper groove 31 formed on the outer circumferential surface of the three-stage pipe 30 are formed at different intervals from each other.

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