Telescopic rod

Abstract

The utility model relates to the technical field of telescopic devices, in particular to a telescopic rod which comprises multiple sections of pipe bodies, the multiple sections of pipe bodies are sequentially connected in a sleeved mode according to the caliber size, a connecting piece is fixed to the bottom end of each section of pipe body, an upper hinge piece is arranged at the bottom end of each connecting piece, and a lower hinge piece is hinged to each upper hinge piece. The upper hinging piece and the lower hinging piece are hinged to each other, the hinging part of the upper hinging piece and the lower hinging piece has a damping effect, the lower hinging piece is connected with a movable plug, a friction sleeve is fixed at the top end of each section of pipe body, each friction sleeve is provided with an inner hole, in two adjacent sections of pipe bodies, the pipe body with a smaller diameter extends into the inner hole of the friction sleeve fixed by the pipe body with a larger diameter, and the friction sleeve is provided with an inner hole. The hole wall of an inner hole of the friction sleeve fixed to the pipe body with the large diameter is used for being in friction contact with the outer wall of the pipe body with the small diameter and is used for being in friction contact with the outer side wall of the movable plug connected with the pipe body with the small diameter, and the pipe bodies have the swing freedom degree relative to the axial direction while the traditional axial telescopic function is kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of telescopic devices, and more particularly to a telescopic rod. BACKGROUND

[0002] The existing telescopic rod generally adopts a multi-stage sleeve nesting structure, and the longitudinal length adjustment is realized by the axial sliding cooperation of the inner and outer pipe bodies. The telescopic rod is widely used in daily life, such as a selfie stick, a telescopic clothesline rod, a telescopic umbrella handle, a fishing rod, a mop, a telescopic electric fan, a telescopic lamp, etc. However, such a structure has an essential limitation in design: the relative movement between the rod bodies can only be in the axial direction, and it is difficult to realize the relative axial direction swing angle. For example, in the case of a lighting device, the telescopic rod is used to adjust the lighting height to expand or focus the light coverage area. When the irradiation angle needs to be adjusted, the telescopic rod needs to be tilted, and the support body of the telescopic rod needs to be tilted accordingly. A corresponding locking structure is needed to keep the support body fixed when it is tilted, which increases the inconvenience of carrying and the difficulty of operation. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the problem that the relative movement between the rod bodies can only be in the axial direction and it is difficult to realize the horizontal swing angle in the related art, the present application provides a telescopic rod.

[0004] A telescopic rod comprises a plurality of pipe bodies, the plurality of pipe bodies are sequentially sleeved according to the size of the caliber, the bottom end of each pipe body is fixed with a connecting piece, the bottom end of the connecting piece is provided with an upper hinge piece, the upper hinge piece is hinged with a lower hinge piece, the hinge part of the upper hinge piece and the lower hinge piece has a damping effect, the lower hinge piece is connected with a movable plug, the top end of each pipe body is fixed with a friction sleeve, the friction sleeve has an inner hole, in the adjacent two pipe bodies, the pipe body with a smaller caliber is inserted into the inner hole of the friction sleeve fixed by the pipe body with a larger caliber, and the inner hole wall of the friction sleeve fixed by the pipe body with a larger caliber is used for friction contact with the outer wall of the pipe body with a smaller caliber and the outer side wall of the movable plug connected with the pipe body with a smaller caliber.

[0005] Preferably, the connecting piece is an injection molding piece, and the outer side wall of the connecting piece is provided with a first circular protruding column, the bottom end side wall of the pipe body is provided with a first opening, the connecting piece is inserted into the opening of the bottom end of the pipe body, and the first circular protruding column is clamped into the first opening to fix the connecting piece and the pipe body.

[0006] Preferably, the friction sleeve is an injection molding piece, the outer side wall of the friction sleeve is provided with a second circular protruding column, the top end side wall of the pipe body is provided with a second opening, the friction sleeve is inserted into the port of the top end of the pipe body, and the second circular protruding column is clamped into the second opening to fix the friction sleeve and the pipe body.

[0007] Preferably, the bottom end outer wall of the movable plug is provided with a protruding edge, and in the adjacent two sections of the pipe body, the protruding edge of the movable plug connected with the pipe body of smaller diameter abuts against the inner wall of the pipe body of larger diameter.

[0008] Preferably, the upper hinge and the lower hinge are both injection molded parts, the upper hinge is a U-shaped bracket, first circular arc grooves are recessed in the opposite two side walls of the U-shaped groove of the U-shaped bracket, a second circular arc groove is recessed in the bottom wall of the U-shaped groove of the U-shaped bracket, the lower hinge is a ball head, the ball head is inserted into the U-shaped groove of the U-shaped bracket, and the U-shaped bracket and the ball head are hinged by accommodating the opposite two side portions of the ball head through the two first circular arc grooves and accommodating the top portion of the ball head through the second circular arc groove, the groove walls of the two first circular arc grooves and the second circular arc groove are tightly fitted with the surface of the ball head.

[0009] Preferably, the upper hinge and the lower hinge are both injection molded parts, the upper hinge is a U-shaped bracket, third circular protruding columns are protruded in the opposite two side walls of the U-shaped groove of the U-shaped bracket, the two third circular protruding columns are symmetrically arranged, the lower hinge is a ball head, the ball head is inserted into the U-shaped groove of the U-shaped bracket, and the ball head is provided with a third opening, damping sleeves are embedded in the two ends of the third opening of the ball head, fourth openings are arranged in the middle portions of the two damping sleeves and communicated with the third opening, the two third circular protruding columns are inserted into the fourth openings of the two damping sleeves to hinge the U-shaped bracket and the ball head, and the outer wall of the third circular protruding column is tightly fitted with the hole wall of the fourth opening.

[0010] Preferably, the opposite two sides of the ball head are provided as flat cutting surfaces, the two flat cutting surfaces are tightly fitted with the opposite two side walls of the U-shaped groove of the U-shaped bracket, and the third opening penetrates the two flat cutting surfaces.

[0011] Preferably, the U-shaped bracket is further provided with a fifth opening, the fifth opening is at the position corresponding to the third circular protruding column and penetrates the two third circular protruding columns, the opposite two outer walls of the U-shaped bracket are recessed with sunken grooves, the sunken grooves are communicated with the fifth opening in position, a bolt is inserted into the fifth opening of the U-shaped bracket, a nut is embedded in one of the sunken grooves, the nut is threadedly connected with the bolt, the other sunken groove of the U-shaped bracket is used for accommodating the nut of the bolt, and the U-shaped bracket is tightly pressed by the threaded connection of the bolt and the nut to tightly fit the opposite two side walls of the U-shaped groove of the U-shaped bracket with the surface of the ball head.

[0012] Preferably, the inner wall of each section of the pipe body is formed with a first protrusion and the outer wall of each section of the pipe body is formed with a first groove corresponding to the position of the first protrusion, the first protrusion and the first groove extend along the length direction of the pipe body, the outer wall of the fixed friction sleeve of each section of the pipe body is formed with a second groove and the inner hole wall of the fixed friction sleeve of each section of the pipe body is formed with a second protrusion corresponding to the position of the second groove, the first protrusion of the pipe body is clamped into the second groove of the fixed friction sleeve, and the outer wall of the movable plug connected to each section of the pipe body is formed with a third groove, in the adjacent two sections of the pipe body, the second protrusion of the fixed friction sleeve of the pipe body with a larger diameter is clamped into the first groove of the pipe body with a smaller diameter, and when the movable plug connected to the pipe body with a smaller diameter is moved to the inner hole of the fixed friction sleeve of the pipe body with a larger diameter, the second protrusion of the fixed friction sleeve is clamped into the third groove of the movable plug.

[0013] The application has the following beneficial technical effects:

[0014] Through the damping hinged design of the upper hinge and the lower hinge, while maintaining the traditional axial telescopic function, each section of the pipe body has a relative axial swinging degree of freedom, and a self-locking mechanism is formed by the friction contact design of the inner hole of the friction sleeve, the outer wall of the smaller pipe body and the outer wall of the movable plug. The adjacent two sections of the pipe body are automatically locked at any telescopic length, and the additional locking device required by the traditional structure is omitted, and the operation steps are simplified. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a first state diagram of a telescopic rod of embodiment 1.

[0016] Figure 2 It is a second state diagram of a telescopic rod of embodiment 1.

[0017] Figure 3 It is a sectional view of a telescopic rod of embodiment 1.

[0018] Figure 4 It is Figure 3 It is an enlarged view of position A.

[0019] Figure 5 It is a connection structure schematic diagram of the connecting piece and the upper hinge of embodiment 1.

[0020] Figure 6 It is a connection structure schematic diagram of the lower hinge and the movable plug of embodiment 1.

[0021] Figure 7 It is a structure schematic diagram of the friction sleeve of embodiment 1.

[0022] Figure 8 It is a sectional view of a telescopic rod of embodiment 2.

[0023] Figure 9 for Figure 8 A schematic diagram of the structure at position B in the middle.

[0024] Figure 10 This is a schematic diagram of the connection structure between the connector and the upper hinge in Embodiment 2.

[0025] Figure 11 This is a schematic diagram of the connection structure between the lower hinge and the movable plug in Example 2.

[0026] Figure 12 This is a schematic diagram of the damping sleeve in Example 2.

[0027] Reference numerals: 1. Tube body; 11. First opening; 12. Second opening; 13. First protrusion; 14. First groove; 2. Connector; 21. First circular protrusion; 211. First oblique surface; 22. First limiting edge; 3. Upper hinge; 31. First arc groove; 32. Second arc groove; 33. Third circular protrusion; 331. Third oblique surface; 34. Fifth opening; 35. Countersunk groove; 36. Bolt; 37. Nut; 4. Lower hinge; 41. Third opening; 42. Damping sleeve; 421. Fourth opening; 422. Side lug; 43. Flat surface; 44. Receiving groove; 5. Movable plug; 51. Protrusion; 52. Third groove; 6. Friction sleeve; 61. Second circular protrusion; 611. Second oblique surface; 62. Second limiting edge; 63. Second groove; 64. Second protrusion. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Example 1

[0030] Reference Figures 1-2The utility model provides a telescopic rod, including many section pipe body 1, the cross section of pipe body 1 can be selected as polygon and circle, and is selected as circle in this embodiment, and many section pipe body 1 is successively sleeved according to the caliber size, and the bottom of each pipe body 1 is fixed with connecting piece 2, and the bottom of connecting piece 2 is provided with upper articulated piece 3, and upper articulated piece 3 is articulated with lower articulated piece 4, and the articulated position of upper articulated piece 3 and lower articulated piece 4 has damping effect, and lower articulated piece 4 is connected with movable plug 5, and the top of each pipe body 1 is fixed with friction sleeve 6, and friction sleeve 6 has inner hole, in adjacent two section pipe body 1, the pipe body 1 of smaller caliber is inserted into the inner hole of the friction sleeve 6 fixed by the pipe body 1 of larger caliber, and the inner hole wall of the friction sleeve 6 fixed by the pipe body 1 of larger caliber is used for the friction contact with the outer wall of the pipe body 1 of smaller caliber and is used for the friction contact with the outer side wall of movable plug 5 connected with the pipe body 1 of smaller caliber, in the telescopic process of adjacent two section pipe body 1, the automatic locking of two section pipe body 1 at any telescopic length is realized through the friction force of friction sleeve 6, the additional locking device needed by traditional structure is saved, and the operation step is simplified, and in adjacent connecting pipe body 1, the pipe body 1 of smaller diameter is pulled out the inside of the pipe body 1 of larger diameter, makes movable plug 5 be in the inner hole of the friction sleeve 6 fixed by the pipe body 1 of larger caliber, and the upper articulated piece 3 and lower articulated piece 4 connected with the pipe body 1 of smaller caliber also go out the inside of the pipe body 1 of larger caliber, because upper articulated piece 3 and lower articulated piece 4 are articulated and the articulated position of both has damping effect, so that the pipe body 1 of smaller caliber realizes the transverse swing relative to the pipe body 1 of larger caliber, and after swinging, realizes the position keeping through damping force so that the swing angle realizes the adjustment, the utility model overcomes the limitation of single axial adjustment of traditional telescopic rod, realizes the collaborative adjustment of the telescopic height and angle of the telescopic rod fixed article.

[0031] Referring to Figures 3-7, further, connecting piece 2, upper hinge 3, lower hinge 4, movable plug 5 and friction sleeve 6 are all injection molded parts, and upper hinge 3 is integrally injection molded with connecting piece 2, connecting piece 2 is shaped as a cylinder matching pipe body 1, upper hinge 3 is shaped as a U-shaped frame, lower hinge 4 is integrally molded with movable plug 5, lower hinge 4 is shaped as a ball head, movable plug 5 is shaped as a circular cover structure matching the inner hole of friction sleeve 6, the outer side wall of connecting piece 2 is provided with a first circular protruding column 21, the bottom end side wall of pipe body 1 is provided with a first opening 11, connecting piece 2 is inserted into the opening at the bottom end of pipe body 1 and the first circular protruding column 21 is clamped into the first opening 11 to fix connecting piece 2 with pipe body 1, the opposite side walls of the U-shaped groove of the U-shaped frame are concavely provided with first circular arc grooves 31, the bottom wall of the U-shaped groove of the U-shaped frame is concavely provided with a second circular arc groove 32, lower hinge 4 is a ball head, the ball head is inserted into the U-shaped groove of the U-shaped frame, and the U-shaped frame is hinged with the ball head by accommodating the opposite two side parts of the ball head through the two first circular arc grooves 31 and accommodating the top part of the ball head through the second circular arc groove 32, the groove walls of the two first circular arc grooves 31 and the second circular arc groove 32 are tightly combined with the surface of the ball head, the outer side wall of friction sleeve 6 is provided with a second circular protruding column 61, the top end side wall of pipe body 1 is provided with a second opening 12, friction sleeve 6 is inserted into the port at the top end of pipe body 1 and the second circular protruding column 61 is clamped into the second opening 12 to fix friction sleeve 6 with pipe body 1, in the above structure, the injection molded parts have viscoelasticity, high friction resistance and deformation and automatic recovery ability, in the hinging of the ball head with the U-shaped frame, the hinging of the two is realized by the friction resistance of the surface of the ball head with the U-shaped frame, which has a damping effect, and the U-shaped frame realizes circumferential rotation around the ball head, and at the same time realizes multi-directional swinging of the axis of relative telescopic shaft telescoping of each section of pipe body 1, the freedom degree of relative swinging of each section of pipe body 1 is higher, in the movement of friction sleeve 6 with pipe body 1 and movable plug 5, the relative fixation of friction sleeve 6 with pipe body 1 and movable plug 5 is realized by the friction resistance of the injection molded parts, and pipe body 1 is subjected to a pulling force or pressure higher than the friction force to realize relative movement with friction sleeve 6 to realize extension or retraction, the deformation and automatic recovery ability of the injection molded parts realizes clamping of the first circular protruding column 21 into the first opening 11 and clamping of the second circular protruding column 61 into the second opening 12.

[0032] Referring to Figure 1 and Figure 5, further, in order to make the first circular column 21 more convenient to be clamped into the first opening 11 and make the second circular column 61 more convenient to be clamped into the second opening 12, the first circular column 21, the second circular column 61, the height of the protrusion thereof is 0.5-0.8mm, and the first circular column 21 is provided with a first chamfer surface 211 which is chamfered from the end face to the direction of the connecting piece 2, so that when the connecting piece 2 is inserted into the pipe body 1, the first chamfer surface 211 is pressed to guide the deformation of the connecting piece 2 to make the first circular column 21 more conveniently clamped into the first opening 11, and the second circular column 61 is provided with a second chamfer surface 611 which is chamfered from the end face to the direction of the friction sleeve 6, so that when the friction sleeve 6 is inserted into the pipe body 1, the second chamfer surface 611 is pressed to guide the deformation of the friction sleeve 6 to make the second circular column 61 more conveniently clamped into the second opening 12.

[0033] With reference to Figure 4 and Figure 5 , further, the outer wall of the bottom end of the connecting piece 2 is provided with a first limiting edge 22, and the bottom surface of the pipe body 1 abuts against the first limiting edge 22 to limit the excessive insertion of the connecting piece 2 into the pipe body 1, and the top end of the friction sleeve 6 is provided with a second limiting edge 62 on the wall, and the top surface of the pipe body 1 abuts against the second limiting edge 62 to limit the excessive insertion of the friction sleeve 6 into the pipe body 1.

[0034] With reference to Figure 4 , Figure 6 and Figure 7 , further, the outer wall of the bottom end of the movable plug 5 is provided with a protruding edge 51, and among the adjacent two pipe bodies 1, the protruding edge 51 of the movable plug 5 connected to the pipe body 1 with smaller diameter abuts against the inner wall of the pipe body 1 with larger diameter, so that the movable plug 5 is not easy to swing and deviate in the pipe body 1 with larger diameter, so that the movable plug 5 is limited to move straight up and straight down, avoiding the situation that the movable plug 5 and the inner hole of the friction sleeve 6 are deviated relatively due to the articulation of the upper articulation 3 and the lower articulation 4, and the movable plug 5 cannot be inserted into the inner hole of the friction sleeve 6, and the protruding edge 51 blocks the contact between the bottom surface of the movable plug 5 and the pipe body 1 to prevent the movable plug 5 from falling off the pipe body 1.

[0035] With reference to Figures 2-7Further, the inner wall of each pipe body 1 is formed with a first protrusion 13 and the outer wall of each pipe body 1 is formed with a first groove 14 corresponding to the position of the first protrusion 13, the first protrusion 13 and the first groove 14 extend along the length direction of the pipe body 1, and the outer wall of the fixed friction sleeve 6 of each pipe body 1 is formed with a second groove 63 and the inner hole wall of the fixed friction sleeve 6 is formed with a second protrusion 64 corresponding to the position of the second groove 63, and the first protrusion 13 of the pipe body 1 is clamped into the second groove 63 of the friction sleeve 6, the outer wall of the movable plug 5 connected to each pipe body 1 is formed with a third groove 52, in the adjacent two pipe bodies 1, the second protrusion 64 of the fixed friction sleeve 6 of the pipe body 1 with larger diameter is clamped into the first groove 14 of the pipe body 1 with smaller diameter, and when the movable plug 5 connected to the pipe body 1 with smaller diameter is moved to the inner hole of the fixed friction sleeve 6 of the pipe body 1 with larger diameter, the second protrusion 64 of the fixed friction sleeve 6 is clamped into the third groove 52 of the movable plug 5, and the second protrusion 64 of the fixed friction sleeve 6 is clamped into the first groove 14 of the pipe body 1 or the third groove 52 of the movable plug 5, which realizes the radial rotation of the pipe body 1 and the movable plug 5, so that the telescopic rod is more stable when loaded.

[0036] With reference to Figure 4 Further, the connecting piece 2, the U-shaped frame, the ball head and the movable plug 5 are all provided with through holes, and the through holes are aligned and communicated along the telescopic direction of the pipe body 1 and are communicated to the inside of the pipe body 1, so that the telescopic rod is hollow as a whole, which is conducive to hiding the electric wire when the telescopic rod needs to be connected to the product through the electric wire, such as hiding the electric wire when the lighting lamp needs to be connected to the electric wire.

[0037] Embodiment 2

[0038] With reference to Figure 8 、 Figure 9 and Figure 12, the difference between embodiment 2 and embodiment 1 is that the upper hinge 3 and the lower hinge 4 are different in the hinge mode, specifically, the upper hinge 3 is shaped as a U-shaped frame, the lower hinge 4 is shaped as a ball head, the U-shaped frame is provided with a third circular boss 33 on the opposite two side walls of the U-shaped groove, the ball head is inserted into the U-shaped groove of the U-shaped frame, the ball head is provided with a third opening 41, the ball head is embedded with a damping sleeve 42 at both ends of the third opening 41, the middle part of the two damping sleeves 42 is provided with a fourth opening 421 communicating with the third opening 41, the two third circular bosses 33 are respectively inserted into the fourth openings 421 of the two damping sleeves 42 to make the U-shaped frame hinge with the ball head, and the outer wall of the third circular boss 33 is tightly attached to the hole wall of the fourth opening 421, through the hinge mode of the third circular boss 33 and the fourth opening 421, the connection stability of the U-shaped frame and the ball head is high, the U-shaped frame and the ball head are not easy to separate, and the load capacity of the telescopic rod is strong. This hinge mode only realizes the swing of each section pipe body 1 in the left and right directions of the axis of the telescopic rod, and provides a larger damping force through the damping sleeve 42, further increasing the load of the telescopic rod. The damping sleeve is a circular rubber sleeve.

[0039] Referring to Figure 2 and Figure 10 , further, in order to make the third circular boss 33 more conveniently inserted into the third opening 41, the third circular boss 33 is provided with a first bevel 211 which is beveled from the end face to the side wall of the U-shaped groove of the U-shaped frame, so that when the ball head is inserted into the U-shaped groove of the U-shaped frame, the third bevel 331 is pressed to guide the deformation of the U-shaped frame to make the third circular boss 33 more conveniently inserted into the third opening 41.

[0040] Referring to Figure 9 and Figure 10 , further, the U-shaped frame is also provided with a fifth opening 34 which is at the position of the third circular boss and penetrates the two third circular bosses 33, the opposite two side walls of the U-shaped frame are concavely provided with a recessed groove 35, the recessed groove 35 is communicated with the fifth opening 34 in position, and the U-shaped frame is penetrated by a bolt 36 in the fifth opening 34, and a nut 37 is embedded in one recessed groove 35, the nut 37 is threadedly connected with the bolt 36, and the other recessed groove 35 of the U-shaped frame is used for accommodating the nut of the bolt, the U-shaped groove of the U-shaped frame is tightly attached to the surface of the ball head by pressing the U-shaped frame through the screw connection of the bolt 36 and the nut 37, and the load of the telescopic rod is further increased by the tight attachment of the opposite two side walls of the U-shaped groove to the surface of the ball head.

[0041] Referring to Figure 9 and Figure 11Further, the opposite sides of the ball head are provided with flat cutting surfaces 43, the two flat cutting surfaces 43 are respectively tightly attached to the opposite side walls of the U-shaped groove of the U-shaped frame, the third opening 41 penetrates the two flat cutting surfaces 43, through the above structure, the opposite side walls of the U-shaped groove of the U-shaped frame are tightly attached to the ball head, the contact area of the U-shaped frame and the ball head is increased, so that the damping effect of the U-shaped frame and the ball head is better.

[0042] With reference to Figure 11 and Figure 12 Further, the ball head is provided with a receiving groove 44 on each of the two flat cutting surfaces 43, the outer wall of the end portion of each of the two damping sleeves 42 is formed with a side lug 422, the side lug 422 of each of the two damping sleeves 42 is matched with the size of the receiving groove 44 and is embedded in the receiving groove 44, the opposite side walls of the U-shaped frame tightly press the side lug 422 of each of the two damping sleeves 42, so that the damping sleeve 42 is more stable in the third opening 41 of the ball head and is not easy to be deviated, and the opposite side walls of the U-shaped frame further contact the side lug 422, which further increases the damping force of the U-shaped frame and the ball head, so that the telescopic rod has stronger load capacity.

[0043] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A telescopic pole characterised in that: The utility model provides a kind of multi-section pipe body, and the pipe body is sequentially sleeved according to caliber size, the bottom end of each pipe body is fixed with connecting piece, the bottom end of connecting piece is provided with upper articulated piece, upper articulated piece is articulated with lower articulated piece, the articulated part of upper articulated piece and lower articulated piece has damping effect, lower articulated piece is connected with movable plug, the top end of each pipe body is fixed with friction sleeve, the friction sleeve has inner hole, in adjacent two pipe bodies, smaller caliber pipe body is inserted into the inner hole of the friction sleeve fixed by larger caliber pipe body, and the inner hole hole wall of the friction sleeve fixed by larger caliber pipe body is used to be contacted with the outer wall of smaller caliber pipe body and is used to be contacted with the outer wall of movable plug connected with smaller caliber pipe body; Connecting piece is injection molding piece, and the outer wall of connecting piece is provided with first circular boss, the bottom end of pipe body is provided with first opening, connecting piece is inserted into the opening of the bottom end of pipe body, and first circular boss is inserted into first opening, so that connecting piece is fixed with pipe body; Friction sleeve is injection molding piece, and the outer wall of friction sleeve is provided with second circular boss, the top end of pipe body is provided with second opening, friction sleeve is inserted into the port of the top end of pipe body, and second circular boss is inserted into second opening, so that friction sleeve is fixed with pipe body.

2. A telescopic pole according to claim 1, characterised in that: The bottom end of movable plug is provided with convex edge, and in adjacent two pipe bodies, the convex edge of movable plug connected with smaller caliber pipe body is abutted with the inner wall of larger caliber pipe body.

3. A telescopic pole according to claim 1, characterised in that: Upper articulated piece and lower articulated piece are both injection molding piece, and upper articulated piece is U-shaped frame, the opposite two side walls of the U-shaped groove of U-shaped frame are provided with first circular arc groove, the bottom wall of the U-shaped groove of U-shaped frame is provided with second circular arc groove, lower articulated piece is ball head, ball head is inserted into the U-shaped groove of U-shaped frame, and the opposite two side parts of ball head are accommodated in two first circular arc grooves respectively and the top of ball head is accommodated in second circular arc groove, so that U-shaped frame is articulated with ball head, and the groove wall of two first circular arc grooves and second circular arc groove is closely combined with the surface of ball head.

4. A telescopic pole according to claim 1, characterised in that: Upper articulated piece and lower articulated piece are both injection molding piece, and upper articulated piece is U-shaped frame, the opposite two side walls of the U-shaped groove of U-shaped frame are provided with third circular boss, two third circular bosses are symmetrically arranged, lower articulated piece is ball head, ball head is inserted into the U-shaped groove of U-shaped frame, and ball head is provided with third opening, damping sleeve is embedded in the two ends of third opening, the middle part of two damping sleeves is provided with fourth opening which is communicated with third opening, two third circular bosses are inserted into fourth opening of two damping sleeves respectively, so that U-shaped frame is articulated with ball head, and the outer wall of third circular boss is closely combined with the hole wall of fourth opening.

5. A telescopic pole according to claim 4, characterised in that: The opposite two sides of ball head are provided with flat cutting surface, two flat cutting surfaces are closely combined with the opposite two side walls of the U-shaped groove of U-shaped frame respectively, and third opening penetrates two flat cutting surfaces.

6. A telescopic pole according to claim 4, characterised in that: The U-shaped frame is further provided with a fifth opening which is positioned at the position of the third circular convex column and penetrates the two third circular convex columns, the opposite two side walls of the U-shaped frame are concavely provided with a sink, the sink is in communication with the fifth opening in position, a bolt is penetrated into the fifth opening of the U-shaped frame, a nut is embedded in one of the sinks, the nut is threadedly connected with the bolt, the other sink of the U-shaped frame is used for accommodating the nut of the bolt, and the U-shaped frame is pressed by the bolt and the nut to make the opposite two side walls of the U-shaped groove of the U-shaped frame closely contact with the spherical head surface.

7. A telescopic pole according to claim 1, characterised in that: The inner wall of each section of the pipe body is formed with a first protrusion, and the outer wall of each section of the pipe body is formed with a first groove corresponding to the position of the first protrusion, the first protrusion and the first groove are both extended along the length direction of the pipe body, the outer wall of the fixed friction sleeve of each section of the pipe body is formed with a second groove, and the inner hole wall of the fixed friction sleeve of each section of the pipe body is formed with a second protrusion corresponding to the position of the second groove, the first protrusion of the pipe body is clamped into the second groove of the friction sleeve, the outer wall of the movable plug connected with each section of the pipe body is formed with a third groove, in the adjacent two sections of the pipe body, the second protrusion of the fixed friction sleeve of the pipe body with a larger diameter is clamped into the first groove of the pipe body with a smaller diameter, and when the movable plug connected with the pipe body with a smaller diameter is moved to the inner hole of the fixed friction sleeve of the pipe body with a larger diameter, the second protrusion of the fixed friction sleeve is clamped into the third groove of the movable plug.

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