Separating type locking telescopic pipe

Abstract

The invention discloses a separation type locking telescopic pipe which comprises a first pipe fitting, a second pipe fitting, a third pipe fitting and a fourth pipe fitting, an expansion piece is arranged at one end of the first pipe fitting, and a matched convex part is arranged on the inner wall of the expansion piece which is provided with a spiral guide groove; the second pipe fitting is movably arranged on the first pipe fitting and the expansion piece in a sleeving manner; the driving rod penetrates through the first pipe fitting, and the driving rod is provided with an eccentric part and a guide column; the operating part is connected with the driving rod; when the length size is adjusted, the operating piece moves relative to the first pipe fitting to drive the driving rod to telescopically move in the length direction of the first pipe fitting, and the guide column moves along the spiral guide groove to drive the matched convex part and the eccentric part to relatively deflect; the first pipe fitting and the second pipe fitting are fixed in an expanding mode through the expansion piece, the expansion piece abuts against the inner circumferential wall of the second pipe fitting, the force application position of the operation piece is separated from the locking position of the first pipe fitting and the second pipe fitting, operation and use are convenient, the operation piece can be in linkage with other mechanisms to lock other components, and other use functions are expanded.

Description

Technical Field

[0001] This invention relates to a detachable locking telescopic tube. Background Technology

[0002] Selfie sticks, tripods, and other photography equipment often use telescopic tubes. These tubes typically consist of an inner tube and an outer tube fitted over it. The inner tube can extend or retract relative to the outer tube. To maintain relative stability between the inner and outer tubes, a protrusion is usually present on the outer wall of the inner tube, and a bend is present on the inner wall of the outer tube to mate with the protrusion. When the inner tube rotates relative to the outer tube until the protrusion and bend are misaligned, the outer wall of the inner tube and the inner wall of the outer tube fit tightly together.

[0003] This type of telescopic tube requires force to be applied at the connection between the inner and outer tubes to tighten and fix it, making it very inconvenient to use and impossible to perform other functions simultaneously while locking the inner and outer tubes. Moreover, during use, accidental activation or excessive load can cause relative rotation between adjacent tubes, thereby unlocking the locking relationship between the two adjacent tubes, causing the telescopic tube to shorten in length, and even causing the equipment to tip over.

[0004] In addition, the telescopic tube of this structure requires the protrusion to be set along the length of the inner tube and the bend to be set along the length of the outer tube. This allows the relative angle between the inner tube and the outer tube to be locked at any position when the inner tube is telescopically moved relative to the outer tube. This limits the cross-sectional shape of the inner and outer tubes and makes them prone to bumps and deformation during production and transportation. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a separable locking telescopic tube, in which the force application position of the operating member and the position for locking the first and second tubes are separated, which facilitates operation and use, and makes it impossible to apply external force to the first and second tubes to unlock them, ensuring that the length dimension of the telescopic tube assembly remains stable. When the operating member moves, it can also be linked with other mechanisms to lock other components, expanding other functions.

[0006] According to an embodiment of the present invention, a separable locking telescopic tube includes: a first tube, one end of which is provided with an expansion member, the inner wall of which is provided with a mating protrusion, and the expansion member having a spiral guide groove spirally arranged around the central axis of the first tube; a second tube, movably sleeved on the outside of the first tube and the expansion member; a drive rod, passing through the first tube along its length direction, the drive rod having an eccentric portion that mates with the mating protrusion, and a guide post that mates with the spiral guide groove; and an operating member, movably disposed on the first tube and connected to the drive rod, capable of driving the drive rod to telescopically move along the length direction of the first tube to move the guide post along the spiral guide groove, thereby driving the mating protrusion to deflect relative to the eccentric portion so that the expansion member presses against the inner peripheral wall of the second tube.

[0007] A detachable locking telescopic tube according to an embodiment of the present invention has at least the following beneficial effects: When adjusting the length of the telescopic tube with the above structure, after the second tube is telescopically moved relative to the first tube into position, the operating component moves relative to the first tube to drive the drive rod to telescopically move along the length direction of the first tube. The guide post moves along the spiral guide groove, causing the mating protrusion and eccentric part to deflect relative to each other, thereby pressing the tightening component against the inner circumferential wall of the second tube to achieve tightening and fixing between the first and second tubes. External force cannot be applied to the first and second tubes to unlock them, ensuring the stability of the telescopic tube's length and guaranteeing the reliability of equipment support. Furthermore, the force application position of the operating component and the locking position of the first and second tubes are separate, facilitating operation and eliminating the need to limit the cross-sectional shape of the tubes. During movement, the operating component can also be linked with other mechanisms to lock other components, expanding its functionality.

[0008] In some embodiments of the present invention, the expansion member has a plurality of arc-shaped plates circumferentially distributed around the central axis of the first tube, at least two of the arc-shaped plates having the mating protrusions formed on their inner peripheral walls, and at least two of the eccentric portions being correspondingly provided on the drive rod.

[0009] In some embodiments of the present invention, the mating protrusion is a first bend formed on the inner peripheral wall of the arc-shaped plate, the eccentric portion is a first protrusion that matches the first bend, and the radial distance from the first protrusion to the central axis of the first pipe and the radial distance from the first bend to the central axis of the first pipe both decrease along a first clockwise direction.

[0010] In some embodiments of the present invention, the expansion member includes a mounting ring connected to the end of the first pipe, the arc-shaped plate extends away from the first pipe along the end face of the mounting ring, a spiral guide groove is formed between adjacent arc-shaped plates, one end of the drive rod is provided with a cylindrical shaft, and the eccentric part and the plurality of guide posts protrude from the outer peripheral wall of the cylindrical shaft.

[0011] In some embodiments of the present invention, the end face of the mounting ring forms the bottom of the spiral guide groove, one end of the spiral guide groove is disposed through the spiral guide groove in a direction away from the mounting ring, the eccentric portion and the guide post protrude from the outer peripheral wall of the cylindrical shaft to form a stepped portion opposite to the mounting ring, and a compression spring abuts between the stepped portion and the mounting ring to drive the guide post to disengage along the port of the spiral guide groove.

[0012] In some embodiments of the present invention, the end of the first tube away from the expansion member is movably provided with a telescopic locking mechanism that can drive the drive rod to telescopically move along the length direction of the first tube and then be fixed.

[0013] In some embodiments of the present invention, the operating element is a knob that rotates and moves up and down around the central axis of the first tube. The knob is connected to a pulling element that can pull the drive rod to move along the length direction of the first tube. The telescopic locking mechanism is provided in the threaded structure between the knob and the first tube.

[0014] In some embodiments of the present invention, the drive rod is tubular, the cylindrical shaft has a through hole extending along its axial direction, and the cylindrical shaft and one end of the drive rod, as well as the expansion member and the first tube, are connected by a threaded structure.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the split locking telescopic tube of the present invention when its length is shortened; Figure 2 for Figure 1 A cross-sectional schematic diagram of an embodiment; Figure 3 for Figure 1 Schematic diagram of the structural breakdown of the embodiment; Figure 4 for Figure 1 A partial schematic diagram of the combination of the eccentric portion and the mating protrusion in the embodiment.

[0017] Figure label: First fitting 100; expansion member 200; mating protrusion 210; spiral guide groove 220; arc plate 230; mounting ring 240; second fitting 300; drive rod 400; eccentric part 410; guide post 420; cylindrical shaft 430; operating member 500; compression spring 600; tension member 510. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] See Figures 1 to 4An embodiment of the present invention provides a separable locking telescopic tube, comprising: a first tube 100, one end of which is provided with an expansion member 200, the inner wall of which is provided with a mating protrusion 210, and the expansion member 200 having a spiral guide groove 220 spirally arranged around the central axis of the first tube 100; a second tube 300, movably sleeved on the outside of the first tube 100 and the expansion member 200; and a drive rod 400, passing through the first tube 100 along its length, the drive rod 400 having a mating protrusion 210. The eccentric portion 410 is engaged with the convex portion 210. The drive rod 400 is provided with a guide post 420 that engages with the spiral guide groove 220. The operating member 500 is movably disposed on the first pipe 100 and connected to the drive rod 400. It can drive the drive rod 400 to extend and retract along the length direction of the first pipe 100 so that the guide post 420 moves along the spiral guide groove 220, thereby driving the convex portion 210 to deflect relative to the eccentric portion 410 so that the tightening member 200 presses against the inner peripheral wall of the second pipe 300.

[0023] When adjusting the length of the telescopic tube with the above structure, after the second tube 300 telescopically moves into position relative to the first tube 100, the operating member 500 moves relative to the first tube 100 to drive the drive rod 400 to telescopically move along the length direction of the first tube 100. The guide post 420 moves along the spiral guide groove 220, causing the mating protrusion 210 and the eccentric part 410 to deflect relative to each other, thereby pressing the expansion member 200 against the inner circumferential wall of the second tube 300 to achieve expansion and fixation between the first tube 100 and the second tube 300. It is impossible to apply external force to the first tube 100 and the second tube 300 to unlock them, ensuring that the length of the telescopic tube remains stable and guaranteeing the reliability of equipment support. Moreover, the force application position of the operating member 500 and the locking position of the first tube 100 and the second tube 300 are separate, which facilitates operation and use, and does not require limitation on the cross-sectional shape of the tubes. When the operating member 500 moves, it can also be linked with other mechanisms to lock other components, expanding other functions.

[0024] See Figure 3 and Figure 4In some embodiments of the present invention, the expansion member 200 has multiple arc-shaped plates 230 circumferentially distributed around the central axis of the first pipe 100, at least two of the arc-shaped plates 230 having the mating protrusions 210 formed on their inner peripheral walls, and at least two eccentric portions 410 correspondingly disposed on the drive rod 400. It should be noted that the at least two arc-shaped plates 230 and the mating protrusions 210 are circumferentially distributed around the central axis of the first pipe 100, and the corresponding number of eccentric portions 410 are also correspondingly disposed. The multiple arc-shaped plates 230 can deform radially outward to press against multiple angular positions of the inner peripheral wall of the second pipe 300, thereby increasing the locking force for locking the first pipe 100 and the second pipe 300, and simultaneously improving reliability.

[0025] See Figure 3 and Figure 4 In some embodiments of the present invention, the mating protrusion 210 is a first bend formed on the inner peripheral wall of the arc plate 230, and the eccentric part 410 is a first protrusion that matches the first bend. The radial distance from the first protrusion to the central axis of the first pipe 100 and the radial distance from the first bend to the central axis of the first pipe 100 both decrease along the first clockwise direction.

[0026] Understandably, as the angle of rotation of the tensioning member 200 relative to the drive rod 400 gradually increases, the interference fit between the first protrusion and the first bend gradually increases, resulting in a more stable locking force and smoother locking and unlocking of the telescopic tube's length. The first clockwise direction can be either clockwise or counterclockwise, depending on actual needs.

[0027] See Figure 3 and Figure 4 In some embodiments of the present invention, the expansion member 200 includes a mounting ring 240 connected to the end of the first pipe 100. The arc-shaped plate 230 extends away from the first pipe 100 along the end face of the mounting ring 240. A spiral guide groove 220 is formed between adjacent arc-shaped plates 230. One end of the drive rod 400 is provided with a cylindrical shaft 430. The eccentric portion 410 and multiple guide posts 420 protrude from the outer peripheral wall of the cylindrical shaft 430. It should be noted that the mounting ring 240 is annular, and the central axis of the mounting ring 240 and the first pipe 100 are coaxial. When multiple arc-shaped plates 230 are formed alternately on the mounting ring 240, several spiral guide grooves 220 are automatically formed. The spiral guide grooves 220 also serve as the interval area between two arc-shaped plates 230. The structural design is very ingenious. Specifically, both sides of the curved plate 230 are inclined or curved surfaces, and a spiral guide groove 220 can be defined between the opposite sides of the two curved plates 230.

[0028] The diameter of the cylindrical shaft 430 is matched with the inner diameter of the mounting ring 240 to achieve the function of rotation guidance. Multiple arc plates 230 and mounting ring 240 can be obtained by integral injection molding, which helps to balance manufacturing cost and ensure that the arc plate 230 has good elastic deformation capability.

[0029] See Figure 3 and Figure 4 In some embodiments of the present invention, the end face of the mounting ring 240 forms the bottom of the spiral guide groove 220, one end of the spiral guide groove 220 is provided through in a direction away from the mounting ring 240, the eccentric portion 410 and the guide post 420 protrude from the outer peripheral wall of the cylindrical shaft 430 to form a stepped portion opposite to the mounting ring 240, and a compression spring 600 abuts between the stepped portion and the mounting ring 240 to drive the guide post 420 to disengage along the port of the spiral guide groove 220. It should be noted that when the operating component 500 drives the drive rod 400 to move along the length of the first tube 100 so that the guide post 420 moves a certain distance toward the bottom of the spiral guide groove 220 and is then fixed, the tensioning member 200 is forced to rotate relative to the drive rod 400. The convex part 210 is subjected to radially outward pressure from the eccentric part 410, causing the tensioning member 200 to deform radially outward along the second tube 300 and abut against the inner circumferential wall of the second tube 300. At this time, the compression spring 600 is in a compressed state. However, when the operating component 500 drives the drive rod 400 to reset so that the tensioning member 200 is no longer pressing against the second tube 300, the guide post 420 may experience difficulty moving smoothly within the spiral guide groove 220 and become stuck. In this case, the compression spring 600 helps the guide post 420 disengage along the port of the spiral guide groove 220, thus smoothly switching to the state where the telescopic tube can be freely adjusted in length.

[0030] See Figure 2 In some embodiments of the present invention, in order to enable the operating member 500 to drive the driving rod 400 to move telescopically along the length direction of the first tube 100 and then be positioned and fixed, a telescopic locking mechanism is movably provided at one end of the first tube 100 away from the expansion member 200, which can drive the driving rod 400 to move telescopically along the length direction of the first tube 100 and then be fixed.

[0031] See Figure 2In some embodiments of the present invention, the operating member 500 is a knob that rotates and moves up and down around the central axis of the first pipe 100. The knob is connected to a pulling member 510 that can pull the drive rod 400 to move along the length direction of the first pipe 100. The telescopic locking mechanism is provided in the threaded structure between the knob and the first pipe 100. It can be imagined that when the knob rotates relative to the first pipe 100, due to the locking effect of the threaded structure, the knob can be fixed after moving up and down relative to the first pipe 100. The drive rod 400 can rotate relative to the pulling member 510, and the pulling member 510 only drives the drive rod 400 to move along the axial direction of the first pipe 100 together with it. This telescopic locking mechanism is very simple and easy to manufacture.

[0032] In other embodiments, the telescopic locking mechanism can also be replaced by having a plurality of ratchet teeth along the length of the first tube 100, and the operating member 500 having an elastic pawl that engages with the ratchet teeth. Of course, the telescopic locking mechanism can also adopt other structures, as long as it can achieve the function of fixing the drive rod 400 after it has telescopically moved along the length of the first tube 100.

[0033] See Figure 3 and Figure 4 In some embodiments of the present invention, the drive rod 400 is tubular, which is beneficial for weight reduction. The cylindrical shaft 430 has a through hole extending along its axial direction, which is beneficial for the eccentric part 410 to generate a slight elastic deformation to achieve a good clamping effect. In order to reduce the difficulty of manufacturing, the cylindrical shaft 430 and one end of the drive rod 400, and the expansion member 200 and the first tube 100 are connected by a threaded structure. The cylindrical shaft 430 and the expansion member 200 are processed separately and then assembled in sequence.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A detachable locking telescopic tube, characterized in that, include: A first pipe fitting (100) is provided with an expansion member (200) at one end. The inner wall of the expansion member (200) is provided with a mating protrusion (210). The expansion member (200) has a spiral guide groove (220) spirally arranged around the central axis of the first pipe fitting (100). The second fitting (300) is movably sleeved on the outside of the first fitting (100) and the expansion member (200); A drive rod (400) is inserted through the first pipe (100) along the length direction of the first pipe (100). The drive rod (400) is provided with an eccentric part (410) that cooperates with the mating protrusion (210). The drive rod (400) is provided with a guide post (420) that cooperates with the spiral guide groove (220). An operating component (500) is movably disposed on the first pipe (100) and connected to the drive rod (400). It can drive the drive rod (400) to extend and retract along the length direction of the first pipe (100) so that the guide post (420) moves along the spiral guide groove (220), thereby driving the mating protrusion (210) to deflect relative to the eccentric part (410) so that the tightening member (200) presses against the inner peripheral wall of the second pipe (300).

2. The detachable locking telescopic tube according to claim 1, characterized in that: The expansion member (200) has multiple arc-shaped plates (230) circumferentially distributed around the central axis of the first tube (100), and the inner peripheral walls of at least two of the arc-shaped plates (230) are formed with the mating protrusions (210), and at least two of the eccentric portions (410) are correspondingly provided on the drive rod (400).

3. A detachable locking telescopic tube according to claim 2, characterized in that: The mating protrusion (210) is a first bend formed on the inner peripheral wall of the arc plate (230), and the eccentric part (410) is a first protrusion that matches the first bend. The radial distance from the first protrusion to the central axis of the first pipe (100) and the radial distance from the first bend to the central axis of the first pipe (100) both decrease along the first clockwise direction.

4. A detachable locking telescopic tube according to claim 2, characterized in that: The expansion member (200) includes a mounting ring (240) connected to the end of the first pipe (100). The arc plate (230) extends away from the first pipe (100) along the end face of the mounting ring (240). A spiral guide groove (220) is formed between adjacent arc plates (230). One end of the drive rod (400) is provided with a cylindrical shaft (430). The eccentric part (410) and multiple guide posts (420) are all protruding from the outer peripheral wall of the cylindrical shaft (430).

5. A detachable locking telescopic tube according to claim 4, characterized in that: The end face of the mounting ring (240) forms the bottom of the spiral guide groove (220). One end of the spiral guide groove (220) is provided through in a direction away from the mounting ring (240). The eccentric part (410) and the guide post (420) protrude from the outer peripheral wall of the cylindrical shaft (430) to form a stepped part opposite to the mounting ring (240). A compression spring (600) abuts between the stepped part and the mounting ring (240) to drive the guide post (420) to disengage along the port of the spiral guide groove (220).

6. A detachable locking telescopic tube according to claim 5, characterized in that: A telescopic locking mechanism is provided between the operating member (500) and the end of the first tube (100) away from the expansion member (200), which enables the drive rod (400) to be telescopically moved and fixed along the length direction of the first tube (100).

7. A detachable locking telescopic tube according to claim 6, characterized in that: The operating component (500) is a knob that rotates and moves up and down around the central axis of the first pipe (100). The knob is connected to a pulling component (510) that can pull the drive rod (400) to move along the length direction of the first pipe (100). The telescopic locking mechanism is provided in the threaded structure between the knob and the first pipe (100).

8. A detachable locking telescopic tube according to claim 4, characterized in that: The drive rod (400) is tubular, and the cylindrical shaft (430) has a through hole extending along its axial direction. The cylindrical shaft (430) and one end of the drive rod (400) are connected by a threaded structure, as are the expansion member (200) and the first tube (100).

Images