TWM545197U - Telescopic rod - Google Patents

Description

Telescopic rod

The present invention relates to a rod, and more particularly to a telescopic rod that can be adjusted in length and locked.

The telescopic rod is a rod structure which can be widely used in various fields. The principle is that the rods of different sizes and sizes are sleeved with each other, and the ends of each rod are fixed to each other in order to make it completely complete. When stretched, it can be a rod with a certain length. At present, the most widely known application of this technology is a trekking pole for mountaineering and a self-timer for photographing.

Among them, the prior art telescopic rods can be roughly divided into two types: the pressing type and the locking type, and the pressing type telescopic rod is used between the rod body and the rod body at the connecting portion. The parts (both ends of the rod) have a large difference in diameter between the tubes, so when the user stretches the tube, the connected portions will fix the two rods that are in contact with each other, so as to make the rods tightly The body is engaged, and when the user wants to close the rod body, the rod body is slightly pressed, so that the parts that are pressed against each other are separated from each other, so that the rod body returns to the relationship of the outer jacket and the contraction; The rod body is provided with a locking member at the top end of each rod body, and when the user tightens the locking member, the rod body can be fixed to the lower layer rod body disposed inside the rod body.

However, the two locking methods have the following disadvantages in use.

First, for the tight type of the rod, since the fixing principle is based on the pressing force between the rod body and the rod body, long-term use, it is very likely that the rod body itself is structurally weakened, and then occurs. If the condition of the pipe is broken, and the rod body is cracked, it can no longer be used.

Secondly, the tight rod system is interlocked with each other through the rod body, so each rod body must be unfolded to achieve a fixed effect when stretching, in other words, it cannot extend only a certain rod body because the user When only a certain section of the rod is used, the remaining unstrapped shaft is actually slidable, so it will slide continuously during use, causing difficulty in use; for example, when the telescopic rod is three sections In the construction, if the user only stretches the first section with the smallest diameter and does not extend the second section, in this case, only the first section of the rod is in a fixed state, that is, The rods in the second section are free to slide up and down. This is a problem for users who need to use the telescopic rod firmly but do not need to stretch to the full length. It is not suitable for normal use (because the second section will slide and not stabilize) .

Thirdly, although the locking type telescopic rod overcomes the shortcomings of the above-mentioned pressing type which cannot extend only the specific node body, since the locking type telescopic rod protrudes with the locking fastener on each of the rod bodies, It is not only unsightly and easy to be broken or damaged during use.

In summary, in the prior art, the structural improvement of the telescopic rod still has its disadvantages that cannot be overcome.

In view of the shortcomings and deficiencies of the prior art, the present invention provides a telescopic rod which is further provided with a non-protruding fixing portion at the top end of the telescopic rod, so that the present invention can not only extend the length thereof in sections but also maintain the telescopic rod. The overall appearance and avoid the possibility of the fixed part being broken.

For the purpose of the above-mentioned creation, the technical means adopted by the present invention is a telescopic rod, which comprises an outer rod, a middle rod and an inner rod which are sequentially sleeved, and the outer rod and the middle rod are both a hollow rod body, wherein the outer rod is sleeved on the outer rod, and the middle rod is sleeved up and down on the inner rod, wherein the outer rod is provided with an outer rod fixing portion. The outer rod fixing portion is disposed on an inner wall surface of the top end of the outer rod; The middle rod is provided with a first middle rod fixing portion and a second middle rod fixing portion, and the first middle rod fixing portion and the second middle rod fixing portion are respectively disposed on an outer wall surface and an inner wall surface of the middle rod top end; The inner rod is provided with an inner rod fixing portion, and the inner rod fixing portion is disposed on an outer wall surface of the top end of the inner rod; the telescopic rod has a folded state and an extended state, and in the folded state, the inner rod and the middle rod The rod is folded into the outer rod, and the outer rod fixing portion is fixed to the first middle rod fixing portion, and the second middle rod fixing portion is fixed to the inner rod fixing portion.

For the purpose of the above creation, the technical means adopted by the present invention is a telescopic rod, which comprises an outer rod, a plurality of middle rods and an inner rod which are sequentially sleeved, and the outer rod and the middle rod are a hollow rod body, wherein each of the middle rods is sleeved from the outside to the other, the outer rod is sleeved up and down on the outermost outer rod, and the innermost rod is vertically slidable The outer rod is disposed outside the inner rod, wherein the outer rod is provided with an outer rod fixing portion, and the outer rod fixing portion is disposed on an outer wall surface of the outer rod top; each of the middle rods is provided with a first middle rod fixing portion and a second portion a middle rod fixing portion, wherein the first middle rod fixing portion and the second middle rod fixing portion are respectively disposed on an outer wall surface and an inner wall surface of the middle rod top; the inner rod is provided with an inner rod fixing portion, and the inner rod fixing portion An outer wall surface disposed at a top end of the inner rod; the telescopic rod has a collapsed state and an extended state, and in the folded state, the inner rod and the middle rod are engaged in the outer rod, and the outer rod The fixing portion is fixed to the first middle rod fixing portion of the outermost middle rod, and the second middle portion of the middle rod The first rod fixing portion fixing thereto sleeved portions of the rod is fixed to the innermost of the rod of the second rod fixing portion fixed to the fixed portion of the inner rod.

The advantage of the present invention is that the first middle rod fixing portion of the middle rod is fixed through the outer rod fixing portion provided on the inner wall surface of the outer rod. Similarly, the second middle rod fixing portion of the inner rod inner wall surface is used to fix the inner rod. The inner rod fixing portion allows the user to perform the segmental deployment through the interlocking but independent fixing manner of the ring, for example, if the user connects the second middle rod fixing portion with the inner rod fixing portion Separate, the inner rod can be extended by itself, and the middle rod is still connected to the outer rod because its first middle rod fixing portion Therefore, the middle rod will not be separated from the outer rod, so compared with the prior art telescopic rod, the user does not have to open the whole time when the creation is to be performed; at the same time, since the setting of the fixed parts is almost telescopic The shape of the rod itself, so this creation effectively reduces the possibility of collapse of the lock compared to the lockable telescopic rod that can be extended.

Further, in the above-mentioned telescopic rod, the outer rod fixing portion is an internal thread; the first middle rod fixing portion is an external thread, and the outer rod fixing portion is screwed with the first middle rod fixing portion.

Further, in the above-mentioned telescopic rod, the second middle rod fixing portion is an internal thread; the inner rod fixing portion is an external thread, and the second middle rod fixing portion is screwed with the inner rod fixing portion.

Further, in the above telescopic rod, wherein the outer diameter of the top end of the outer rod is smaller than the outer diameter of the bottom end of the outer rod, the outer diameter of the top end of the middle rod is smaller than the outer diameter of the bottom end of the middle rod, outside the top end of the inner rod The outer diameter of the bottom end of the inner rod is tightly attached to the inner wall surface of the top end of the outer rod, and the outer wall surface of the inner rod is closely attached to the outer wall surface of the inner rod The inner wall surface of the top end of the middle rod.

Further, the telescopic rod further includes an outer rod explosion-proof ring, a middle rod explosion-proof ring and an inner rod explosion-proof ring, the outer rod explosion-proof ring is sleeved on the top end of the outer rod, and the middle rod explosion-proof ring sleeve The outer rod explosion-proof ring is sleeved on the top end of the inner rod, and the outer diameter of the outer rod explosion-proof ring is larger than the outer diameter of the middle rod explosion-proof ring, and the outer diameter of the middle rod explosion-proof ring is larger than The outer diameter of the inner rod explosion-proof ring; wherein, in the folded state, the outer rod explosion-proof ring, the middle rod explosion-proof ring and the inner rod explosion-proof ring are in contact with each other in sequence.

Further, in the above telescopic rod, wherein the top surface of the outer rod explosion-proof ring is higher than the top surface of the outer rod, and the outer rod fixing portion is formed on the inner wall surface of the outer rod explosion-proof ring; the middle rod explosion-proof ring The top surface of the middle rod is formed on the outer wall surface of the middle rod explosion-proof ring, and the second middle rod fixing portion is formed on the inner wall surface of the middle rod explosion-proof ring. The top surface of the inner rod explosion-proof ring is higher than the top surface of the inner rod, and the inner rod fixing portion is formed on the outer wall surface of the inner rod explosion-proof ring.

Further, in the above telescopic rod, the top surface of the outer rod explosion-proof ring is flush with the top surface of the outer rod, and the outer rod fixing portion is formed on the inner wall surface of the outer rod top; the middle rod explosion-proof ring The top surface of the middle rod is flush with the top surface of the middle rod, and the first middle rod fixing portion is formed under the middle rod explosion-proof ring of the outer wall surface of the top end of the middle rod, and the second middle rod fixing portion is formed therein An inner wall surface of the top end of the rod; a top surface of the inner rod explosion-proof ring is flush with a top surface of the inner rod, and the inner rod fixing portion is formed under the inner rod explosion-proof ring of the outer wall surface of the inner rod top end.

Further, in the above-mentioned telescopic rod, the outer rod fixing portion is formed on the inner wall surface of the top end of the outer rod; the first middle rod fixing portion is formed on the outer wall surface of the top end of the middle rod, and the second middle rod is fixed The portion is formed on an inner wall surface of the top end of the middle rod; the inner rod fixing portion is formed on an outer wall surface of the top end of the inner rod.

10‧‧‧Outer

11‧‧‧Outer rod fixing

20‧‧‧中杆

21‧‧‧First pole fixed part

22‧‧‧Second middle pole fixing

23‧‧‧ Third pole fixed part

30‧‧‧ inner rod

31‧‧‧ inner rod fixing

32‧‧‧ inner rod bottom fixing

41‧‧‧External explosion-proof ring

42‧‧‧Medium rod explosion-proof ring

43‧‧‧ inner rod explosion-proof ring

10A‧‧‧Outer

11A‧‧‧Outer rod fixing

20A‧‧‧中杆

21A‧‧‧First pole fixed part

22A‧‧‧Second middle pole fixing

30A‧‧‧ inner pole

31A‧‧‧ inner rod fixing

41A‧‧‧External explosion-proof ring

42A‧‧‧中杆 explosion-proof ring

43A‧‧‧ inner rod explosion-proof ring

Figure 1 is a plan view of the creation.

Figure 2 is a schematic plan view of the expanded state of the present creation.

Figure 3 is a schematic exploded view of the component of the present invention.

Figure 4 is a top cross-sectional view of the present creation state.

Figure 5A is an enlarged cross-sectional view of the A-A cut line of Figure 2;

Fig. 5B is an enlarged cross-sectional view showing the line B-B of Fig. 2;

Fig. 6 is a schematic plan view showing the second mode of the present invention.

Figure 7 is an exploded cross-sectional view showing the second embodiment of the present invention.

The technical means adopted by the present invention for achieving the intended purpose of creation are further explained below in conjunction with the drawings and the preferred embodiment of the present invention.

Referring to FIG. 1 and FIG. 2, the telescopic rod of the present invention comprises an outer rod 10, a middle rod 20 and an inner rod 30 which are sequentially sleeved, and the outer rod 10, the middle rod 20 and the inner rod Each of the 30 is a hollow rod body, and the outer rod 10 is sleeved on the outer rod 20 so as to be slidable up and down, and the middle rod 20 is sleeved on the outer rod 30 so as to be slidable up and down.

The creation further includes an outer rod explosion-proof ring 41, a middle rod explosion-proof ring 42 and an inner rod explosion-proof ring 43, the outer rod explosion-proof ring 41 is sleeved on the top end of the outer rod 10, and the middle rod explosion-proof ring 42 is set on the middle rod 20 The outer rod explosion-proof ring 43 is sleeved on the top end of the inner rod 30, and the outer diameter of the outer rod explosion-proof ring 41 is larger than the outer diameter of the middle rod explosion-proof ring 42, and the outer diameter of the middle rod explosion-proof ring 42 is larger than the inner rod explosion-proof ring. The outer diameter of 43 is such that the explosion-proof rings 41, 42, 43 are sleeved on the outer rod 10, the middle rod 20 and the top end of the inner rod 30 for the purpose of strengthening the stability of the end of the rod body, but the creation may not have such explosion-proof Rings 41, 42, 43.

Referring to FIG. 2 and FIG. 3 , the outer rod 10 is further provided with an outer rod fixing portion 11 , and the outer rod fixing portion 11 is disposed on the inner wall surface of the top end of the outer rod 10 . In the first embodiment, the outer rod fixing portion 11 is an internal thread, but not limited to this, it can also be other structures, only to achieve the fixed effect.

Referring to FIG. 2 and FIG. 3 , the middle rod 20 is further provided with a first middle rod fixing portion 21 and a second middle rod fixing portion 22 , and the first middle rod fixing portion 21 is disposed on the outer wall surface of the top end of the middle rod 20 . The second middle rod fixing portion 22 is disposed on the inner wall surface of the top end of the middle rod 20, and in the first embodiment, the first middle rod fixing portion 21 is an external thread, and the internal thread of the outer rod fixing portion 11 is first and middle. The second middle rod fixing portion 22 is an internal thread, but the first middle rod fixing portion 21 and the second middle rod fixing portion 22 are also not limited thereto. For other structures, it is only necessary to achieve a fixed effect.

Referring to FIG. 2 and FIG. 3, the inner rod 30 is provided with an inner rod fixing portion 31, and the inner rod fixing portion 31 is disposed on the outer wall surface of the top end of the inner rod 30. In the first embodiment, the inner rod fixing portion 31 is An external thread is provided, and the second middle rod fixing portion 22 is selectively screwed with the inner rod fixing portion 31. However, the inner rod fixing portion 31 may be other structures, and only the fixing effect can be achieved. Just fine.

Referring to FIG. 2, FIG. 4, FIG. 5A and FIG. 5B, the telescopic rod of the present invention has two states, one is a collapsed state, and the other is an extended state. In the collapsed state, the inner rod 30 and the middle rod 20 The inner rod fixing portion 11 is fixed to the outer rod 10, and the outer rod fixing portion 11 is fixed (screwed), and the second middle rod fixing portion 22 is fixed to the inner rod fixing portion 31 (screwed). In the folded state, the outer rod explosion-proof ring 41 and the middle rod explosion-proof ring 42 are in contact with each other. In addition, since the outer diameter of the top end of the outer rod 10 is smaller than the outer diameter of the bottom end of the outer rod 10, the top end of the middle rod 20 is outside the top of the middle rod 20 The diameter is smaller than the outer diameter of the bottom end of the middle rod 20, and the outer diameter of the top end of the inner rod 30 is smaller than the outer diameter of the bottom end of the inner rod 30. Therefore, in the extended state, the outer wall surface of the bottom end of the middle rod 20 will closely adhere to the outer rod. The inner wall surface of the top end of the inner rod 30 is closely attached to the inner wall surface of the top end of the middle rod 20, but not limited thereto, how to fix the rod bodies 10, 20, 30 in the extended state. It can also be other ways.

In addition, this creation has the following two settings for the setting positions of the internal and external threads.

The first way is as follows:

Referring to FIG. 3, FIG. 4, FIG. 5A and FIG. 5B, the top surface of the outer rod explosion-proof ring 41 is higher than the top surface of the outer rod 10, and the outer rod fixing portion 11 (internal thread) is formed on the outer rod explosion-proof ring 41. On the inner wall surface, in other words, the outer rod fixing portion 11 is formed on a portion of the inner wall surface of the top end of the outer rod explosion-proof ring 41 which is higher than the inner wall surface of the top end of the outer rod 10.

Referring to FIG. 3, FIG. 4, FIG. 5A and FIG. 5B, the top surface of the middle rod explosion-proof ring 42 is higher than the top surface of the middle rod 20, and the first middle rod fixing portion 21 (external thread) is formed on the middle rod explosion-proof ring. On the outer wall surface of the outer wall surface 42, the second middle rod fixing portion 22 (internal thread) is formed on the inner wall surface of the middle rod explosion-proof ring 42, and more precisely, the second middle rod fixing portion 22 is formed on the top end of the middle rod explosion-proof ring 42 The inner wall surface is higher than the inner wall surface of the top end of the middle rod 20, and the first middle rod fixing portion 21 is only formed on the outer wall surface of the middle rod explosion-proof ring 42, and the height position can be performed according to the designer's needs. Adjustment.

The top surface of the inner rod explosion-proof ring 43 is higher than the top surface of the inner rod 30, and the inner rod fixing portion 31 (outer thread) is formed on the outer wall surface of the inner rod explosion-proof ring 43, but the height position thereof is not limited, and can be used according to the use. The needs of the people are adjusted.

In the first mode, in the folded state, the portion of the middle rod explosion-proof ring 42 having the first middle rod fixing portion 21 is screwed onto the rod fixing portion 11 outside the inner wall surface of the outer rod explosion-proof ring 41, and The rod explosion-proof ring 43 has a portion of the inner rod fixing portion 31 which is screwed to the second middle rod fixing portion 22 of the inner wall surface of the middle rod explosion-proof ring 42, in other words, the lower half of the middle rod explosion-proof ring 42 overlaps the outer rod Inside the explosion-proof ring 41, the lower half of the inner rod explosion-proof ring 43 overlaps the inside of the middle rod explosion-proof ring 42.

The second way is as follows:

Referring to FIG. 6, the top surface of the outer rod explosion-proof ring 41 is flush with the top surface of the outer rod 10, and the outer rod fixing portion 11 is formed on the inner wall surface of the top end of the outer rod 10.

The top surface of the middle rod explosion-proof ring 42 is flush with the top surface of the middle rod 20, and the first middle rod fixing portion 21 is formed on the outer wall surface of the top end of the middle rod 20, below the middle rod explosion-proof ring 42, and the second middle rod is fixed. The portion 22 is formed on the inner wall surface of the top end of the middle rod 20.

The top surface of the inner rod explosion-proof ring 43 is flush with the top surface of the inner rod 30, and the inner rod fixing portion 31 is formed on the outer wall surface of the top end of the inner rod 30 and below the inner rod explosion-proof ring 43.

In the second mode, in the folded state, since the first middle rod fixing portion 21 (outer thread) is formed on the middle rod 20 and below the middle rod explosion-proof ring 42, when the shaft is screwed, the middle rod is explosion-proof. The bottom surface of the ring 42 abuts against the top surface of the outer rod explosion-proof ring 41, and the two do not overlap each other. Similarly, since the inner rod fixing portion 31 (external thread) is formed on the inner rod 30, the inner rod explosion-proof ring Below the 43th, the bottom surface of the inner rod explosion-proof ring 43 after the screwing is abutted against the top surface of the middle rod explosion-proof ring 42, and the two do not overlap each other.

In addition, in the unfolded state, in the second mode, the outer rod fixing portion 11 and the middle rod fixing portion 22 are formed on the inner wall surfaces of the outer rod 10 and the top end of the middle rod 20, so as in the first mode, The rod body in the extended state is fixed by the structure which is pressed against pressure, and the shaft of the middle rod 20 and the inner rod 30 are very It may be damaged by the friction of the fixing portions 11 and 22 (internal threads). Therefore, in the second state, the inner diameters of the top end and the bottom end of the outer rod 10 are the same, and the inner diameters of the top and bottom ends of the middle rod 20 are the same. The lengths of the inner rods 30 and the bottom end of the inner rod 30 are the same, but a third middle rod fixing portion 23 is further added to the bottom end of the middle rod 20, and an inner rod bottom end fixing portion 32 is further provided at the bottom end of the inner rod 30. Therefore, in the second mode, in the extended state, the middle rod 20 and the inner rod 30 are fixed by screwing to avoid the possibility that the outer surface of the rod is damaged by thread friction.

The biggest difference between the first mode and the second mode is that the fixing portions 11, 21, 22 and 31 are formed on the explosion-proof rings 41, 42, 43 or formed on the rods 10, 20, 30, so In the second mode, the explosion-proof rings 41, 42, 43 are also absent (since the fixing portions 11, 21, 22, 31 are formed on the rods 10, 20, 30).

Referring to FIG. 7, the following is a second embodiment of the present invention. The second embodiment is substantially the same as the first embodiment, but in the number of the middle poles 20A, the single pole 20 is changed into a plurality of roots. Rod 20A.

Therefore, in the second embodiment, each of the middle rods 20A is sleeved from the outside to the other, the outer rod 10A is slidably sleeved on the outermost middle rod 20A, and the innermost middle rod 20A is It is slidable over the inner rod 30A.

Each of the middle rods 20A is provided with a first middle rod fixing portion 21A and a second middle rod fixing portion 22A. The first middle rod fixing portion 21A is disposed on the outer wall surface of the top end of the middle rod 20A, and the second middle rod fixing portion 22A is disposed on The inner wall surface of the top end of the middle rod 20A, but not limited thereto, the manner of fixing between the middle rod 20A and the middle rod 20A may be other manners.

In addition, in the second embodiment, the explosion-proof rings 41A, 42A, and 43A are also provided. The number of the inner rod explosion-proof rings 42A is not limited thereto, and can be adjusted to the middle pole 20A according to the needs of the user. The number is the same or less than the number of the middle pole 42A.

The second embodiment also has a collapsed state and an extended state, and in the collapsed state, the inner rod 30A and the middle rod 20A are engaged in the outer rod 10A, and the outer rod fixing portion 11A and the outermost side are The first middle rod fixing portion 21A of the middle rod 20A is fixed, and the second middle rod fixing portion 22A of the middle rod 20A is fixed to the first middle rod fixing portion 21A of the rod 20A in the middle thereof, and the innermost side is fixed The second middle rod fixing portion 22A of the center rod 20A is fixed to the inner rod fixing portion 31A of the inner rod 30A.

Further, the overlapping state of the explosion-proof rings 41A, 42A, 43A with each other is also as described in the first embodiment, and can be determined according to the positions at which the fixing portions 11A, 21A, 22A, and 31A are formed.

In summary, the creation can control the extension between the respective rods in the extended state, thereby achieving the purpose of freely adjusting the length, and the shape of the fixed part of the creation is close to the body of the creation. Therefore, it is not easily damaged by the squeeze of external force, and through the arrangement of the explosion-proof rings, the portion where the rod body and the rod body are combined in the extended state is less prone to cracking. Therefore, through the aforementioned design, this creation makes this creation a telescopic rod structure with both convenience and durability.

The above description is only a preferred embodiment of the present invention, and does not impose any form limitation on the present creation. Although the present invention has been disclosed above in the preferred embodiment, the present invention is not limited thereto, and has any technical field. A person skilled in the art can make some modifications or modifications to the equivalent embodiments by using the above-disclosed technical contents without departing from the scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still within the scope of the present technical solution.

10‧‧‧Outer

11‧‧‧Outer rod fixing

20‧‧‧中杆

21‧‧‧First pole fixed part

22‧‧‧Second middle pole fixing

30‧‧‧ inner rod

31‧‧‧ inner rod fixing

41‧‧‧External explosion-proof ring

42‧‧‧Medium rod explosion-proof ring

43‧‧‧ inner rod explosion-proof ring

Claims (10)

a telescopic rod comprising an outer rod, a middle rod and an inner rod which are sequentially sleeved, the outer rod and the middle rod are hollow rod bodies, and the outer rods are sleeved up and down The outer rod is disposed outside the inner rod, wherein the outer rod is disposed outside the inner rod, wherein the outer rod is provided with an outer rod fixing portion, and the outer rod fixing portion is disposed on the inner wall surface of the top end of the outer rod; The middle rod is provided with a first middle rod fixing portion and a second middle rod fixing portion, and the first middle rod fixing portion and the second middle rod fixing portion are respectively disposed on an outer wall surface and an inner wall surface of the middle rod top end; The inner rod is provided with an inner rod fixing portion, and the inner rod fixing portion is disposed on an outer wall surface of the top end of the inner rod; the telescopic rod has a folded state and an extended state, and in the folded state, the inner rod and the middle rod The rod is folded into the outer rod, and the outer rod fixing portion is fixed to the first middle rod fixing portion, and the second middle rod fixing portion is fixed to the inner rod fixing portion. The telescopic rod according to claim 1, wherein the outer rod fixing portion is an internal thread; the first middle rod fixing portion is an external thread, and the outer rod fixing portion is screwed with the first middle rod fixing portion. . The telescopic rod according to claim 1, wherein the second middle rod fixing portion is an internal thread; the inner rod fixing portion is an external thread, and the second middle rod fixing portion is screwed with the inner rod fixing portion. . The telescopic rod according to claim 2, wherein the second middle rod fixing portion is an internal thread; the inner rod fixing portion is an external thread, and the second middle rod fixing portion is screwed with the inner rod fixing portion . The telescopic rod according to any one of claims 1 to 4, wherein an outer diameter of the top end of the outer rod is smaller than an outer diameter of a bottom end of the outer rod, and an outer diameter of the top end of the middle rod is smaller than an outer diameter of a bottom end of the middle rod The outer diameter of the top end of the inner rod is smaller than the outer diameter of the bottom end of the inner rod, and in the extended state, the outer wall surface of the bottom end of the middle rod is in close contact with the inner wall surface of the top end of the outer rod, and the bottom end of the inner rod The outer wall surface is in close contact with the inner wall surface of the top end of the middle rod. The telescopic rod according to any one of claims 1 to 4, further comprising an outer rod explosion-proof ring, a middle rod explosion-proof ring and an inner rod explosion-proof ring, the outer rod explosion-proof ring being sleeved on the top end of the outer rod The inner rod explosion-proof ring is sleeved on the top end of the middle rod, the inner rod explosion-proof ring is sleeved on the top end of the inner rod, and the outer diameter of the outer rod explosion-proof ring is larger than the outer diameter of the middle rod explosion-proof ring, The outer diameter of the explosion-proof ring of the rod is larger than the outer diameter of the explosion-proof ring of the inner rod; wherein, in the folded state, the outer rod explosion-proof ring, the middle rod explosion-proof ring and the inner rod explosion-proof ring are in contact with each other. The telescopic rod according to claim 6, wherein a top surface of the outer rod explosion-proof ring is higher than a top surface of the outer rod, and the outer rod fixing portion is formed on an inner wall surface of the outer rod explosion-proof ring; The top surface of the ring is higher than the top surface of the middle rod, and the first middle rod fixing portion is formed on the outer wall surface of the middle rod explosion-proof ring, and the second middle rod fixing portion is formed on the inner wall surface of the middle rod explosion-proof ring The top surface of the inner rod explosion-proof ring is higher than the top surface of the inner rod, and the inner rod fixing portion is formed on the outer wall surface of the inner rod explosion-proof ring. The telescopic rod according to claim 6, wherein a top surface of the outer rod explosion-proof ring is flush with a top surface of the outer rod, and the outer rod fixing portion is formed on an inner wall surface of the top end of the outer rod; The top surface of the ring is flush with the top surface of the middle rod, and the first middle rod fixing portion is formed under the middle rod explosion-proof ring of the outer wall surface of the top end of the middle rod, and the second middle rod fixing portion is formed on the The inner surface of the top end of the middle rod; the top surface of the inner rod explosion-proof ring is flush with the top surface of the inner rod, and the inner rod fixing portion is formed under the inner rod explosion-proof ring of the outer wall surface of the inner rod top end. The telescopic rod according to any one of claims 1 to 4, wherein the outer rod fixing portion is formed on an inner wall surface of the top end of the outer rod; the first middle rod fixing portion is formed on an outer wall surface of the top end of the middle rod The second middle rod fixing portion is formed on an inner wall surface of the top end of the middle rod; and the inner rod fixing portion is formed on an outer wall surface of the top end of the inner rod. a telescopic rod comprising an outer rod, a plurality of middle rods and an inner rod which are sequentially sleeved, wherein the outer rod and the middle rod are hollow rods, wherein the middle rods are external to each other The outer rod is sleeved on the outer side of the inner rod, and the inner rod is vertically slidably sleeved outside the inner rod, wherein the outer rod is provided with an outer portion a rod fixing portion, the outer rod fixing portion is disposed on an outer wall surface of the top end of the outer rod; each of the middle rods is provided with a first middle rod fixing portion and a second middle rod fixing portion, and the first middle rod fixing portion and the The second middle rod fixing portion is respectively disposed on the outer wall surface and the inner wall surface of the top end of the middle rod; the inner rod is provided with an inner rod fixing portion, and the inner rod fixing portion is disposed on the outer wall surface of the top end of the inner rod; the telescopic rod has a a folding state and an extended state, wherein the inner rod and the middle rod are engaged in the outer rod, and the outer rod fixing portion and the outermost middle rod are the first middle rod The fixing portion is fixed, and the second middle rod fixing portion of the middle rod is respectively fixed with the first middle rod of the middle rod The fixed portion is fixed, and the second middle rod fixing portion of the innermost middle rod is fixed to the inner rod fixing portion.