Three-piece telescopic tube one-key locking mechanism

Abstract

This invention discloses a one-click locking mechanism for a three-section telescopic tube, comprising: a first tube with a first locking member at its lower end; a second tube movably sleeved on the outside of the first tube and the first locking member, capable of telescopic movement relative to the first tube, and having a locking part inside that cooperates with the first locking member; a three-section base located at the lower end of the second tube, with three legs circumferentially distributed around the central axis of the second tube; a second locking member movable relative to the three-section base; and a drive rod passing through the second tube, with its lower end fixedly connected to the second locking member, and its upper part being drively connected to the first locking member; the first locking member can rotate around the central axis of the second tube to drive the drive rod to rotate, thereby driving the first locking member to engage with the locking part and simultaneously driving the second locking member to contact the legs so that the legs are stably in the extended state, and can also unlock the first tube from the second tube and unlock the legs to the three-section base, improving ease of use.

Description

Technical Field

[0001] This invention relates to a one-click locking mechanism for a three-section telescopic tube. Background Technology

[0002] Currently, stands used for photography or projection generally consist of a tube, with the upper end connected to the external device. A three-section base is mounted on the lower end of the tube, with three rotatable legs that can be extended or retracted relative to it. To ensure stability when the three legs are extended relative to the three-section base, a locking mechanism is typically installed on the base to abut against the sides of the legs. For adjustable height of the external device, the tube is generally a telescopic tube, comprising an inner tube and an outer tube that is movably fitted within the inner tube. A locking structure is provided between the inner and outer tubes to lock and unlock their relative positions.

[0003] The locking mechanism is located at the bottom of the telescopic tube, requiring users to squat or bend over to unlock or lock the outriggers, resulting in a poor user experience. The locking structure between the inner and outer tubes also requires separate operation. Therefore, locking the telescopic tube's length and the outriggers' angle requires at least two steps, and these two steps are located at different points along the telescopic tube's height, necessitating users to adjust their hand height for operation, making it very inconvenient.

[0004] In addition, the three-section seat is located on the outside of the lower end of the telescopic tube, which requires the addition of physical mounting parts and threaded fasteners for connection. This makes manufacturing and assembly inconvenient and can easily lead to accidental contact that could unlock the support legs. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a one-click locking mechanism for a three-section telescopic tube, which can simultaneously lock two adjacent tubes and lock the support leg to the three-section seat, and can also simultaneously unlock two adjacent tubes and unlock the support leg to the three-section seat, thereby improving ease of use.

[0006] According to an embodiment of the present invention, a one-click locking mechanism for a three-section telescopic tube includes: a first tube, the lower end of which is provided with a first locking member; a second tube, movably sleeved outside the first tube and the first locking member, capable of telescopic movement relative to the first tube, the interior of which is provided with a locking part that cooperates with the first locking member; a three-section base, located at the lower end of the second tube, the three-section base having three legs circumferentially distributed around the central axis of the second tube, the legs being capable of rotating downward relative to the three-section base to an unfolded state, or rotating upward relative to the three-section base to a retracted state converging on the outer peripheral wall of the second tube; and a second locking member. The support leg can move relative to the three-section base to stabilize it in the unfolded state; the drive rod passes through the interior of the second tube along its length, the lower end of the drive rod is fixedly connected to the second locking member, and the upper part of the drive rod is throttle connected to the first locking member; wherein, the first locking member is configured to rotate about the central axis of the second tube to drive the drive rod to rotate, thereby driving the first locking member to engage with the locking part and driving the second locking member to contact the support leg to stabilize the support leg in the unfolded state.

[0007] The one-key locking mechanism for the three-slot telescopic tube according to an embodiment of the present invention has at least the following beneficial effects: The above-mentioned one-button locking mechanism for the telescopic tube of the three-section base allows the user to drive the first locking member to rotate, which in turn drives the second locking member to move via the drive rod. The first locking member engages with the locking part, and the second locking member stabilizes the extended state of the support leg. Alternatively, the user can drive the first locking member to rotate, which separates the first locking member from the locking part and unlocks the support leg with the second locking member. This allows for simultaneous locking of two adjacent tubes and locking of the support leg to the three-section base, as well as simultaneous unlocking of two adjacent tubes and unlocking of the support leg to the three-section base, thus improving ease of use.

[0008] In some embodiments of the present invention, the first locking member is fixedly connected to the lower end of the first pipe. The outer peripheral wall of the first locking member is provided with a first helical segment arranged spirally around the centerline axis of the first pipe. An expansion sleeve is sleeved on the outside of the first locking member. The inner peripheral wall of the expansion sleeve is provided with a second helical segment that is threadedly engaged with the first helical segment. An inclined surface driving mechanism is provided between the inner peripheral wall of the expansion sleeve and the outer peripheral wall of the first locking member. When the first pipe rotates relative to the second pipe, the inclined surface driving mechanism can drive the expansion sleeve to move or deform radially outward along the second pipe.

[0009] In some embodiments of the present invention, the inclined surface driving mechanism includes a frustum-shaped inclined surface that is narrower at the top and wider at the bottom, formed on the outer peripheral wall of the first locking member, and the inner peripheral wall of the expansion sleeve is formed with a mating inclined surface that fits against the frustum-shaped inclined surface.

[0010] In some embodiments of the present invention, the expansion sleeve includes a circular ring and multiple arc plates arranged circumferentially around the lower end of the circular ring. Adjacent arc plates have a gap extending along the length direction of the second tube. The second helical segment is a helical rib formed on the inner circumferential wall of the circular ring. The mating inclined surface is a concave arc surface that is narrow at the top and wide at the bottom, formed on the inner circumferential wall of each arc plate. The first helical segment is a helical groove provided above the inclined surface of the frustum.

[0011] In some embodiments of the present invention, the three-section base is fixed inside the second tube, one end of the support leg has a connecting rod rotatably disposed on the outer periphery of the three-section base via a horizontal pivot, the outer peripheral wall of the second tube is provided with a notch for the connecting rod to extend and swing up and down, the second locking member is disposed inside the second tube and located above the three-section base, the second locking member can move downward with the drive rod to abut against the upper side of all the connecting rods so that the support leg is stabilized in the unfolded state.

[0012] In some embodiments of the present invention, the outer peripheral wall of the three-section seat is recessed inwardly with three strip-shaped grooves extending parallel to the length direction of the second pipe. The connecting rod includes a first rod portion at least partially accommodated in the strip-shaped groove and a second rod portion intersecting the first rod portion at an obtuse angle. The horizontal pivot passes through the end of the first rod portion away from the second rod portion and the opposite sides of the strip-shaped groove. The second locking member is a circular sleeve that can be movably sleeved on the outside of the three-section seat and the first rod portion. A spiral lifting mechanism is provided between the driving rod and the second pipe, or between the circular sleeve and the second pipe, so that the lower end of the circular sleeve moves downward and simultaneously abuts against all of the first rod portion or all of the second rod portion.

[0013] In some embodiments of the present invention, a connecting block is fixedly connected to the lower end of the drive rod, and the annular sleeve is fixedly connected to the lower end of the connecting block. The spiral lifting mechanism includes a third spiral segment formed on the outer peripheral wall of the connecting block and a fourth spiral segment fixed on the inner peripheral wall of the second pipe fitting and cooperating with the third spiral segment. The annular sleeve has a downward-opening annular slot, and the slot width is matched with the width of the first rod portion to prevent the connecting rod from swinging up and down.

[0014] In some embodiments of the present invention, the cross-section of the drive rod is non-circular, the middle part of the first locking member is provided with a through hole that matches the cross-sectional shape of the drive rod, the first locking member and the expansion sleeve move together relative to the second tube, and the inner edge of the upper end of the second tube is provided with an anti-detachment ring to prevent the expansion sleeve from disengaging.

[0015] In some embodiments of the present invention, the outer peripheral wall of the first locking member is provided with a first eccentric portion, and the locking portion is a second eccentric portion provided on the inner peripheral wall of the second tube and matching the first eccentric portion. The first tube drives the first locking member to rotate so that the first eccentric portion deflects relative to the second eccentric portion. One end of the support leg has a connecting rod rotatably disposed on the outer periphery of the three-section seat via a horizontal pivot. The second locking member is a circular sleeve that can be movably sleeved on the outside of the three-section seat and the connecting rod. The peripheral wall of the circular sleeve is formed with a plurality of U-shaped grooves with downward openings corresponding to the connecting rods. The circular sleeve rotates until the U-shaped grooves are opposite to the corresponding connecting rods so that the support leg can swing up and down. The circular sleeve rotates until the U-shaped grooves are misaligned with the corresponding connecting rods so that the lower end of the circular sleeve abuts against the connecting rod downwards.

[0016] In some embodiments of the present invention, the first locking member is rotatably disposed on the first pipe about the axial direction of the first pipe, the driving rod includes a first unit pipe passing through the first pipe and a second unit pipe passing through the second pipe, the upper end of the first unit pipe is connected to a knob rotatably disposed on the first pipe, the upper end of the second unit pipe is movably sleeved outside the first unit pipe and passes through the first locking member, the outer peripheral wall of the first locking member is provided with a first eccentric part, and the locking part is a second eccentric part disposed on the inner peripheral wall of the second pipe and matching the first eccentric part.

[0017] 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

[0018] 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 first embodiment of the one-key locking mechanism for the three-slot telescopic tube of the present invention when unfolded; Figure 2 for Figure 1 A cross-sectional schematic diagram of an embodiment; Figure 3 for Figure 2 A partially enlarged schematic diagram of the joint between the first locking element and the expansion sleeve; Figure 4 A schematic diagram of one embodiment of the first locking element and the expansion sleeve; Figure 5 for Figure 2 A partially enlarged schematic diagram of the connection between the second locking element and the support leg; Figure 6 for Figure 1 A cross-sectional schematic diagram of the one-click locking mechanism of the three-slot telescopic tube in the embodiment when it is retracted; Figure 7 This is an exploded view of the structure of the second embodiment of the one-key locking mechanism for the three-slot telescopic tube of the present invention; Figure 8 This is a schematic diagram of the internal cross-section of the third embodiment of the three-slot telescopic tube one-click locking mechanism of the present invention.

[0019] Figure label: First fitting 100; First locking element 200; First spiral segment 210; Frustum inclined surface 220; First eccentric part 230; Second fitting 300; Notch groove 310; Fourth spiral segment 320; Anti-detachment ring 330; Second eccentric part 340; Three-cut seat 400; Strip groove 410; Support leg 500; Horizontal pivot 501; Connecting rod 510; First rod part 511; Second rod part 512; Second locking element 600; Slot 610; U-shaped groove 620; Drive rod 700; Connecting block 710; Third spiral segment 720; First unit tube 730; Second unit tube 740; Knob 750; Expansion sleeve 800; Second spiral segment 810; Mating inclined surface 820; Ring 830; Arc plate 840; Gap 850. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See Figures 1 to 6 The one-click locking mechanism for the three-section telescopic tube according to an embodiment of the present invention includes: a first tube 100, the lower end of which is provided with a first locking member 200; a second tube 300, which is movably sleeved on the outside of the first tube 100 and the first locking member 200, and can telescopically move relative to the first tube 100, the interior of the second tube 300 being provided with a locking part that cooperates with the first locking member 200; and a three-section seat 400, which is located at the lower end of the second tube 300, the three-section seat 400 having three legs 500 circumferentially distributed around the central axis of the second tube 300, the legs 500 being able to rotate downward relative to the three-section seat 400 to an unfolded state, or rotate upward relative to the three-section seat 400 to converge to the outside of the second tube 300. The peripheral wall is in a retracted state; the second locking member 600 is movable relative to the three-section seat 400 to stabilize the support leg 500 in the unfolded state; the drive rod 700 passes through the interior of the second tube 300 along the length direction of the second tube 300, the lower end of the drive rod 700 is fixedly connected to the second locking member 600, and the upper part of the drive rod 700 is throttle connected to the first locking member 200; wherein, the first locking member 200 is configured to rotate around the central axis of the second tube 300 to drive the drive rod 700 to rotate, thereby driving the first locking member 200 to engage with the locking part and driving the second locking member 600 to contact the support leg 500 to stabilize the support leg 500 in the unfolded state.

[0025] When the second pipe 300 is telescopically moved into position relative to the first pipe 100 and the support leg 500 is unfolded relative to the three-cut seat 400, the user can drive the first locking member 200 to rotate, which in turn drives the second locking member 600 via the drive rod 700. The first locking member 200 engages with the locking part, and the second locking member 600 stabilizes the unfolded state of the support leg 500. Alternatively, the user can drive the first locking member 200 to rotate, causing it to separate from the locking part and the second locking member 600 to unlock the support leg 500. This innovatively locks two adjacent pipes and locks the support leg 500 to the three-cut seat 400 simultaneously, and can also unlock two adjacent pipes and the support leg 500 to the three-cut seat 400 simultaneously, improving ease of use.

[0026] See Figure 2 and Figure 3 In some embodiments of the present invention, the first locking member 200 is fixedly connected to the lower end of the first pipe 100. The outer peripheral wall of the first locking member 200 is provided with a first spiral segment 210 spirally arranged around the centerline axis of the first pipe 100. An expansion sleeve 800 is sleeved on the outside of the first locking member 200. The inner peripheral wall of the expansion sleeve 800 is provided with a second spiral segment 810 threadedly engaged with the first spiral segment 210. An inclined surface driving mechanism is provided between the inner peripheral wall of the expansion sleeve 800 and the outer peripheral wall of the first locking member 200. When the first pipe 100 rotates relative to the second pipe 300, the inclined surface driving mechanism can drive the expansion sleeve 800 to move or deform radially outward along the second pipe 300. Understandably, when it is necessary to lock the overall length of the first pipe fitting 100 and the second pipe fitting 300, the first pipe fitting 100 rotates axially relative to the second pipe fitting 300. The expansion sleeve 800 can only slide relative to the length direction of the second pipe fitting 300. The first helical segment 210 of the first locking member 200 rotates relative to the second helical segment 810 of the expansion sleeve 800, thereby forcing the expansion sleeve 800 to move axially relative to the first locking member 200 along the second pipe fitting 300. At this time, the inclined plane drive mechanism is triggered, which drives the expansion sleeve 800 to move radially outward or deform radially outward along a portion of the second pipe fitting 300, thus causing the expansion sleeve 800 to press against the inner circumferential wall of the second pipe fitting 300. A portion of the inner circumferential wall of the second pipe fitting 300 serves as the locking part. Simultaneously, the first locking member 200 drives the drive rod 700 to rotate, and the drive rod 700 drives the second locking member 600 to contact or separate from the support leg 500.

[0027] See Figure 3In some embodiments of the present invention, the inclined surface driving mechanism includes a frustum-shaped inclined surface 220, narrow at the top and wide at the bottom, formed on the outer peripheral wall of the first locking member 200. The inner peripheral wall of the expansion sleeve 800 is formed with a mating inclined surface 820 that fits against the frustum-shaped inclined surface 220. It should be noted that the surface slope of the mating inclined surface 820 matches the slope of the frustum-shaped inclined surface 220. When the mating inclined surface 820 moves downward relative to the frustum-shaped inclined surface 220, the frustum-shaped inclined surface 220 drives the expansion sleeve 800 corresponding to the mating inclined surface 820 to expand outward against the inner peripheral wall of the second pipe member 300, thereby improving the stability and reliability of the locking force between the first pipe member 100 and the second pipe member 300.

[0028] See Figure 4 In some embodiments of the present invention, the expansion sleeve 800 includes an annular member 830 and multiple arcuate plates 840 arranged circumferentially around the lower end of the annular member 830. Adjacent arcuate plates 840 have a gap 850 extending along the length of the second tube 300. The second helical segment 810 is a helical rib formed on the inner circumferential wall of the annular member 830. The mating inclined surface 820 is a concave arcuate surface, narrow at the top and wide at the bottom, formed on the inner circumferential wall of each arcuate plate 840. The first helical segment 210 is a helical groove located above the truncated cone inclined surface 220. It is understood that the multiple arcuate plates 840 can elastically deform and contact the inner circumferential wall of the second tube 300, increasing the locking force between the first tube 100 and the second tube 300. The gap 850 provides space for the elastic deformation of the arcuate plates 840.

[0029] See Figure 5In some embodiments of the present invention, the three-section base 400 is fixedly disposed inside the second tube 300. One end of the support leg 500 has a connecting rod 510 rotatably disposed on the outer periphery of the three-section base 400 via a horizontal pivot 501. The outer peripheral wall of the second tube 300 is provided with a notch 310 for the connecting rod 510 to extend and swing up and down. The second locking member 600 is disposed inside the second tube 300 and located above the three-section base 400. The second locking member 600 can move downward with the drive rod 700 to abut against the upper side of all the connecting rods 510, thereby stabilizing the support leg 500 in the unfolded state. The above-described one-button locking mechanism for the three-section base telescopic tube incorporates both the three-section base 400 and the second locking member 600 inside the second tube 300, which helps to reduce the radial dimension of the one-button locking mechanism after storage, facilitates transportation and carrying, and avoids accidental operation. It is particularly important to note that in traditional systems, both the three-section base 400 and the second locking element 600 are located on the lower exterior of the second tube 300. When unlocking or locking the support leg 500, the user needs to squat or bend over, resulting in a poor user experience. However, the one-button locking mechanism for the three-section base telescopic tube of this invention links the first locking element 200, the drive rod 700, and the second locking element 600 together, eliminating the need to bend over or squat, making unlocking and locking much more convenient. Specifically, when the support leg 500 rotates downward to unfold, the connecting rod 510 swings downward from the upper end of the notch 310. When the first locking member 200 and the locking part cooperate to lock the first tube 100 and the second tube 300, the drive rod 700 can drive the second locking member 600 to move downward together and abut against the upper side of all the connecting rods 510. At this time, the three support legs 500 are in contact with the ground, the upper end of the first tube 100 is connected to the external equipment, and the connecting rod 510 has an upward swing tendency under the gravity of the external equipment. The second locking member 600 prevents the connecting rod 510 from swinging upward, thereby stabilizing the support leg 500 in the unfolded state. When it is necessary to retract the support leg 500 into the outer periphery of the second tube 300 and to retract the first tube 100 into the interior of the second tube 300, the first locking member 200 is driven to rotate and reset. The first locking member 200 is no longer engaged with the locking part, and the second locking member 600 is also separated from the connecting rod 510.

[0030] See Figure 5In some embodiments of the present invention, the outer peripheral wall of the three-section seat 400 is recessed inwardly with three strip-shaped grooves 410 extending along the length direction parallel to the second tube 300. The connecting rod 510 includes a first rod portion 511 at least partially accommodated in the strip-shaped grooves 410 and a second rod portion 512 intersecting the first rod portion 511 at an obtuse angle. The horizontal pivot 501 passes through the end of the first rod portion 511 away from the second rod portion 512 and the opposite sides of the strip-shaped grooves 410. The second locking member 600 is a circular sleeve that can be movably sleeved on the outside of the three-section seat 400 and the first rod portion 511. A spiral lifting mechanism is provided between the driving rod 700 and the second tube 300, or between the circular sleeve and the second tube 300, so that the lower end of the circular sleeve moves downward and simultaneously abuts against all of the first rod portion 511 or all of the second rod portion 512. It should be noted that the connecting rod 510, composed of the first rod portion 511 and the second rod portion 512, helps to lower the center of gravity of the entire mechanism, increases the area of ​​the support range, and improves the anti-overturning ability. Moreover, the connecting rod 510 with the above structure also helps to increase the contact position when the second locking member 600 presses down on the connecting rod 510.

[0031] See Figure 5 In some embodiments of the present invention, the lower end of the drive rod 700 is fixedly connected to a connecting block 710, and the annular sleeve is fixedly connected to the lower end of the connecting block 710. The spiral lifting mechanism includes a third spiral segment 720 formed on the outer peripheral wall of the connecting block 710 and a fourth spiral segment 320 fixed on the inner peripheral wall of the second pipe 300 and cooperating with the third spiral segment 720. The annular sleeve has an annular slot 610 with an opening facing downward. The slot width dimension of the slot 610 matches the width dimension of the first rod portion 511 so as to prevent the connecting rod 510 from swinging up and down. It is understandable that when the first pipe 100 or other components drive the drive rod 700 to rotate, the third helical segment 720 and the fourth helical segment 320 cooperate to make the drive rod 700 and the annular sleeve move downward relative to the second pipe 300. The upper end of the first rod portion 511 of each connecting rod 510 extends into the annular slot 610, thereby achieving the function of fixing the support leg 500 after it is unfolded. This structure is very simple and has high reliability.

[0032] See Figure 3 and Figure 4In some embodiments of the present invention, in order to realize the torque transmission between the drive rod 700 and the first locking member 200, and at the same time satisfy the telescopic sliding of the drive rod 700 relative to the first locking member 200, the cross-section of the drive rod 700 is non-circular, and the middle part of the first locking member 200 is provided with a through hole that matches the cross-sectional shape of the drive rod 700. The first locking member 200 and the expansion sleeve 800 move telescopically relative to the second tube 300 together, and the inner edge of the upper end of the second tube 300 is provided with an anti-detachment ring 330 to prevent the expansion sleeve 800 from detaching.

[0033] See Figure 7 In some embodiments of the present invention, the outer peripheral wall of the first locking member 200 is provided with a first eccentric portion 230, and the locking portion is a second eccentric portion 340 provided on the inner peripheral wall of the second tube 300 and matching the first eccentric portion 230. The first tube 100 drives the first locking member 200 to rotate so that the first eccentric portion 230 deflects relative to the second eccentric portion 340. One end of the support leg 500 has a connecting rod 510 rotatably disposed on the outer periphery of the three-section seat 400 via a horizontal pivot 501. The second locking member 600 is a circular sleeve that can be movably sleeved on the outside of the three-section seat 400 and the connecting rod 510. The peripheral wall of the circular sleeve is formed with a plurality of U-shaped grooves 620 with downward openings corresponding to the connecting rods 510. The circular sleeve rotates until the U-shaped grooves 620 are opposite to the corresponding connecting rods 510, so that the support leg 500 can swing up and down. The circular sleeve rotates until the U-shaped grooves 620 are misaligned with the corresponding connecting rods 510, so that the lower end of the circular sleeve abuts against the connecting rod 510 downwards. Understandably, the first tube 100 directly drives the first locking member 200, the drive rod 700, and the annular sleeve to rotate together. When each U-shaped groove 620 is aligned with the corresponding connecting rod 510, the connecting rod 510 can rotate upwards to allow the support leg 500 to be housed in the side wall of the second tube 300. At this time, there is no tight fit between the first eccentric part 230 and the second eccentric part 340, and the first tube 100 and the second tube 300 can freely extend and retract. When each U-shaped groove 620 is misaligned with the corresponding connecting rod 510, the inner circumferential wall of the annular sleeve or the lower end of the annular sleeve contacts the connecting rod 510, preventing the connecting rod 510 from rotating around the horizontal pivot 501. At this time, the first eccentric part 230 and the second eccentric part 340 are tightly fitted, and the first tube 100 and the second tube 300 are relatively fixed. This structure only requires rotating the first tube 100 in both directions to simultaneously lock the length dimension and the support leg 500, or simultaneously unlock the length dimension and the support leg 500, making it very convenient to use.

[0034] See Figure 8In some embodiments of the present invention, the first locking member 200 is rotatably disposed on the first pipe 100 about the axial direction of the first pipe 100. The driving rod 700 includes a first unit tube 730 passing through the first pipe 100 and a second unit tube 740 passing through the second pipe 300. The upper end of the first unit tube 730 is connected to a knob 750 rotatably disposed on the first pipe 100. The upper end of the second unit tube 740 is movably sleeved outside the first unit tube 730 and passes through the first locking member 200. The outer peripheral wall of the first locking member 200 is provided with a first eccentric portion 230. The locking portion is a second eccentric portion 340 disposed on the inner peripheral wall of the second pipe 300 and matching the first eccentric portion 230. It should be noted that if the first tube 100 rotates relative to the second tube 300 due to misoperation or excessive load, the external device may fall over. With the above structure, the knob 750 drives the first unit tube 730 to rotate, which in turn drives the first locking member 200 to rotate. The first eccentric part 230 and the second eccentric part 340 cooperate to lock the first tube 100 and the second tube 300. At the same time, the first unit tube 730 drives the second unit tube 740 to rotate. When the second unit tube 740 rotates, it drives the second locking member 600 to move to stabilize the support leg 500. That is, directly rotating the first tube 100 will not drive the first locking member 200 to rotate, thus avoiding the situation where the first tube 100 rotates relative to the second tube 300 and unlocks. Moreover, when the first tube 100 retracts relative to the second tube 300, the first unit tube 730 also retracts into the second unit tube 740, without affecting the length after storage, which is very ingenious.

[0035] 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.

[0036] 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 one-key locking mechanism for a three-section telescopic tube, characterized in that, include: The first pipe fitting (100) has a first locking element (200) at its lower end. The second pipe fitting (300) is movably sleeved on the outside of the first pipe fitting (100) and the first locking member (200), and can be telescopically moved relative to the first pipe fitting (100). The interior of the second pipe fitting (300) is provided with a locking part that cooperates with the first locking member (200). A three-section base (400) is provided at the lower end of the second pipe fitting (300). The three-section base (400) has three legs (500) circumferentially distributed around the central axis of the second pipe fitting (300). The legs (500) can rotate downward relative to the three-section base (400) to an unfolded state, or rotate upward relative to the three-section base (400) to a retracted state that converges to the outer peripheral wall of the second pipe fitting (300). The second locking member (600) is movable relative to the three-section base (400) to stabilize the support leg (500) in the unfolded state; A drive rod (700) is inserted into the interior of the second pipe fitting (300) along the length direction of the second pipe fitting (300). The lower end of the drive rod (700) is fixedly connected to the second locking member (600), and the upper part of the drive rod (700) is connected to the first locking member (200) in a transmission manner. The first locking member (200) is configured to rotate about the central axis of the second tube (300) to drive the drive rod (700) to rotate, thereby driving the first locking member (200) to engage with the locking part and driving the second locking member (600) to contact the support leg (500) so that the support leg (500) is stabilized in the unfolded state.

2. The one-key locking mechanism for the three-section telescopic tube according to claim 1, characterized in that: The first locking member (200) is fixedly connected to the lower end of the first pipe (100). The outer peripheral wall of the first locking member (200) is provided with a first spiral segment (210) spirally arranged around the center axis of the first pipe (100). An expansion sleeve (800) is sleeved on the outside of the first locking member (200). The inner peripheral wall of the expansion sleeve (800) is provided with a second spiral segment (810) threadedly engaged with the first spiral segment (210). An inclined surface driving mechanism is provided between the inner peripheral wall of the expansion sleeve (800) and the outer peripheral wall of the first locking member (200). When the first pipe (100) rotates relative to the second pipe (300), the inclined surface driving mechanism can drive the expansion sleeve (800) to move or deform radially outward along the second pipe (300).

3. The one-key locking mechanism for the three-section telescopic tube according to claim 2, characterized in that: The inclined surface driving mechanism includes a frustum-shaped inclined surface (220) that is narrow at the top and wide at the bottom, formed on the outer peripheral wall of the first locking member (200), and the inner peripheral wall of the expansion sleeve (800) is formed with a mating inclined surface (820) that fits against the frustum-shaped inclined surface (220).

4. The one-key locking mechanism for the three-section telescopic tube according to claim 3, characterized in that: The expansion sleeve (800) includes a ring (830) and multiple arc plates (840) arranged circumferentially around the ring (830) at intervals at the lower end of the ring (830). There is a gap (850) between adjacent arc plates (840) extending along the length direction of the second tube (300). The second spiral segment (810) is a spiral rib formed on the inner peripheral wall of the ring (830). The mating inclined surface (820) is a concave arc surface that is narrow at the top and wide at the bottom formed on the inner peripheral wall of each arc plate (840). The first spiral segment (210) is a spiral groove provided above the truncated cone inclined surface (220).

5. The one-key locking mechanism for the three-section telescopic tube according to claim 1, characterized in that: The three-section base (400) is fixed inside the second tube (300). One end of the support leg (500) has a connecting rod (510) rotatably mounted on the outer periphery of the three-section base (400) via a horizontal pivot (501). The outer peripheral wall of the second tube (300) is provided with a notch (310) for the connecting rod (510) to extend and swing up and down. The second locking member (600) is located inside the second tube (300) and above the three-section base (400). The second locking member (600) can move downward with the drive rod (700) to abut against the upper side of all the connecting rods (510) so that the support leg (500) is stable in the unfolded state.

6. The one-key locking mechanism for the three-section telescopic tube according to claim 5, characterized in that: The outer peripheral wall of the three-section seat (400) is recessed inwardly with three strip-shaped grooves (410) extending parallel to the length direction of the second pipe (300). The connecting rod (510) includes a first rod portion (511) at least partially accommodated within the strip-shaped grooves (410) and a second rod portion (512) intersecting the first rod portion (511) at an obtuse angle. The horizontal pivot (501) passes through the end of the first rod portion (511) away from the second rod portion (512) and the... On opposite sides of the strip groove (410), the second locking member (600) is a ring sleeve that can be movably sleeved on the outside of the three-section seat (400) and the first rod (511). A spiral lifting mechanism is provided between the drive rod (700) and the second tube (300), or between the ring sleeve and the second tube (300), so that the lower end of the ring sleeve moves downward and simultaneously abuts against all of the first rod (511) or all of the second rod (512).

7. The one-key locking mechanism for the three-section telescopic tube according to claim 6, characterized in that: The lower end of the drive rod (700) is fixedly connected to a connecting block (710), and the annular sleeve is fixedly connected to the lower end of the connecting block (710). The spiral lifting mechanism includes a third spiral segment (720) formed on the outer peripheral wall of the connecting block (710) and a fourth spiral segment (320) fixed on the inner peripheral wall of the second pipe (300) and cooperating with the third spiral segment (720). The annular sleeve has an annular slot (610) with an opening facing downward. The slot width dimension of the slot (610) matches the width dimension of the first rod part (511) so as to prevent the connecting rod (510) from swinging up and down.

8. The one-key locking mechanism for the three-section telescopic tube according to claim 2, characterized in that: The cross-section of the drive rod (700) is non-circular. The middle part of the first locking member (200) is provided with a through hole that matches the cross-sectional shape of the drive rod (700). The first locking member (200) and the expansion sleeve (800) move together relative to the second tube (300). The inner edge of the upper end of the second tube (300) is provided with an anti-detachment ring (330) to prevent the expansion sleeve (800) from detaching.

9. The one-key locking mechanism for the three-section telescopic tube according to claim 1, characterized in that: The outer peripheral wall of the first locking member (200) is provided with a first eccentric part (230), and the locking part is a second eccentric part (340) provided on the inner peripheral wall of the second tube (300) and matching the first eccentric part (230). The first tube (100) drives the first locking member (200) to rotate so that the first eccentric part (230) deflects relative to the second eccentric part (340). One end of the support leg (500) has a connecting rod (510) rotatably disposed on the outer periphery of the three-section seat (400) via a horizontal pivot (501). The locking element (600) is a ring sleeve that can be movably sleeved on the outside of the three-section seat (400) and the connecting rod (510). The peripheral wall of the ring sleeve is formed with a plurality of U-shaped grooves (620) with downward openings corresponding to the connecting rods (510). The ring sleeve rotates until the U-shaped grooves (620) are opposite to the corresponding connecting rods (510), so that the support leg (500) can swing up and down. The ring sleeve rotates until the U-shaped grooves (620) are misaligned with the corresponding connecting rods (510), so that the lower end of the ring sleeve abuts against the connecting rods (510) downwards.

10. The one-key locking mechanism for the three-section telescopic tube according to claim 1, characterized in that: The first locking member (200) is rotatably disposed on the first pipe (100) about the axial direction of the first pipe (100). The driving rod (700) includes a first unit tube (730) passing through the first pipe (100) and a second unit tube (740) passing through the second pipe (300). The upper end of the first unit tube (730) is connected to a knob (750) rotatably disposed on the first pipe (100). The upper end of the second unit tube (740) is movably sleeved on the outside of the first unit tube (730) and passes through the first locking member (200). The outer peripheral wall of the first locking member (200) is provided with a first eccentric part (230). The locking part is a second eccentric part (340) disposed on the inner peripheral wall of the second pipe (300) and matched with the first eccentric part (230).

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