A telescopic leg

Abstract

The utility model discloses a telescopic supporting leg, including the stay wire subassembly, transmission subassembly, a plurality of telescopic tubes and a plurality of unlocking and locking subassembly, a plurality of telescopic tubes are in order and can be relative axial sliding, and the unlocking and locking subassembly is connected between two adjacent telescopic tubes, and the transmission subassembly is connected between the unlocking and locking subassembly, the operating handle has the locking state and the unlocking state, one end of stay wire subassembly is connected with operating handle, and the other end is connected with transmission subassembly, through adopting the photography support of stay wire subassembly as transmission medium, the complex hydraulic component of hydraulic drive type and electronic component of electric drive type are given up, not only can realize one -key type unlocking and locking, but also has the advantages of few parts, compact structure, satisfies the using demand.

Description

Technical Field

[0001] This utility model relates to the field of photographic equipment, and in particular to a telescopic support leg. Background Technology

[0002] In fields such as photographic equipment, measuring instruments, and outdoor equipment, support frames are core components that ensure the stable placement of equipment. Their locking and unlocking efficiency and reliability directly determine operational efficiency and equipment safety. As users increasingly demand support frames that are "convenient, lightweight, and highly stable," support frames with one-button locking and unlocking functions are gradually becoming the mainstream in the market. However, current mainstream technical solutions still have many pain points that are difficult to overcome.

[0003] 1. Hydraulically driven support frames use a hydraulic pump to generate pressure, which is then transmitted to the locking mechanisms of each leg via oil pipes to lock and unlock the telescopic tubes. However, this solution has inherent drawbacks: Firstly, the hydraulic system requires complex components such as hydraulic pumps, cylinders, seals, and oil pipes, resulting in a bulky support frame that is generally 30%-50% heavier than traditional support frames of the same specifications, making it inconvenient to carry and particularly unsuitable for scenarios requiring frequent relocation, such as mountaineering photography and field surveying. Secondly, the hydraulic system has extremely high requirements for sealing performance. Over long-term use, the seals are prone to wear and aging, leading to oil leaks. This not only causes insufficient locking and unlocking power and delayed response but may also pollute the equipment and the environment. Maintenance requires professional personnel to replace the seals and replenish the hydraulic oil, resulting in high maintenance costs and long maintenance cycles.

[0004] 2. Electric-driven support frames rely on components such as motors, circuit boards, and lithium batteries. The motor outputs power to drive the transmission mechanism to complete the locking and unlocking. While this solution offers some improvement in ease of operation, it also has significant drawbacks: First, the addition of electronic components significantly increases manufacturing costs compared to traditional manual support frames. Furthermore, lithium batteries have limited range, requiring spare batteries for extended outdoor use, further increasing the carrying burden. Second, the motor and circuit board have poor environmental adaptability. In low-temperature, humid, and dusty outdoor environments, motor jamming and short circuits are common, compromising stability. Additionally, the electric drive structure has weak impact resistance. If the support frame is accidentally dropped or impacted, precision components such as the motor shaft and reducer gears are easily damaged, leading to higher repair costs and difficulties.

[0005] Therefore, this utility model provides a telescopic support leg that is applied to a photography bracket and uses a pull wire assembly as the transmission medium. Utility Model Content

[0006] 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 telescopic support leg.

[0007] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a telescopic support leg, including a pull cable assembly, a transmission assembly, multiple telescopic tubes and multiple locking / unlocking assemblies, the multiple telescopic tubes are sequentially sleeved and can slide relative to each other axially, the locking / unlocking assemblies are connected between two adjacent telescopic tubes, and the transmission assembly is connected between the locking / unlocking assemblies. The operating handle has a locked state and an unlocked state; One end of the cable assembly is connected to the operating handle, and the other end is connected to the transmission assembly; When the operating handle is in the locked state, it can drive the unlocking and locking assembly through the pull cable assembly and the transmission assembly to lock two adjacent telescopic tubes, thereby restricting the axial sliding of multiple telescopic tubes. Alternatively, when the operating handle is in the unlocked state, it can drive the unlocking and locking assembly through the pull cable assembly and the transmission assembly to unlock two adjacent telescopic tubes, thereby allowing multiple telescopic tubes to slide and extend or slide and shorten axially.

[0008] As one of the preferred embodiments of this utility model, the pull cable assembly includes a first pull cable, a second pull cable and a third pull cable, and three telescopic support legs are provided, each corresponding to one of the first pull cable, the second pull cable and the third pull cable.

[0009] As one of the preferred embodiments of this utility model, the transmission assembly includes a transmission rod, a gear, a rack, and a second elastic element; The transmission rod passes through the telescopic tube and is connected to the locking / unlocking assembly; The gear is connected to the upper end of the transmission rod; The rack meshes with the gear, and the other end of the cable assembly is connected to the rack; The second elastic element abuts against the rack and is used to provide driving force for the rack to return to its original position. When the operating handle is in the locked state, it can drive the rack to move in the first direction through the pull cable assembly, thereby causing the gear and transmission rod to rotate in the forward direction, so that the locking and unlocking assembly locks two adjacent telescopic tubes. Alternatively, when the operating handle is in the unlocked state, the rack can move in the second direction under the action of the second elastic element, thereby causing the gear and transmission rod to rotate in the reverse direction, so that the locking and unlocking assembly unlocks two adjacent telescopic tubes.

[0010] As one of the preferred embodiments of this utility model, the unlocking and locking assembly includes a base, a first driving sleeve, a first locking sleeve, a second driving sleeve, a second locking sleeve, and a third elastic element; The base is installed on the inner side of one of two adjacent telescopic pipes and the middle section is recessed inward, with the transmission component passing through the base; The first drive sleeve is located at the upper end of the base and is connected to the transmission assembly; The first locking sleeve is fitted onto the base and connected to the first driving sleeve. The first locking sleeve is provided with a plurality of circumferentially arranged first abutment members. The second drive sleeve is located at the lower end of the base and is connected to the transmission assembly; The second locking sleeve is fitted onto the base and connected to the first driving sleeve. The second locking sleeve is provided with a plurality of circumferentially arranged second abutment members. The third elastic element abuts between the first locking sleeve and the second locking sleeve; When the operating handle is in the locked state, it can drive the first drive sleeve and the second drive sleeve to rotate in the forward direction through the pull cable assembly and the transmission assembly, forcing the first locking sleeve and the second locking sleeve to move in opposite directions, so that the first abutment and the second abutment abut against the inner wall of the outermost one of the two adjacent telescopic tubes, thereby restricting the axial sliding of the two adjacent telescopic tubes. When the operating handle is in the unlocked state, it can drive the first drive sleeve and the second drive sleeve to rotate in opposite directions through the pull cable assembly and the transmission assembly, forcing the first locking sleeve and the second locking sleeve to move towards each other, causing the first abutment and the second abutment to separate from the inner wall of the outermost one of the two adjacent telescopic tubes, so that the multiple telescopic tubes can slide to extend or shorten axially.

[0011] As one of the preferred embodiments of this utility model, a first guide structure is provided between the first driving sleeve and the first locking sleeve, and a second guide structure is provided between the second driving sleeve and the second locking sleeve, wherein the guiding direction of the first guide structure is opposite to the guiding direction of the second guide structure.

[0012] As one of the preferred embodiments of the present invention, the first guide structure includes a first guide slope disposed on the first drive sleeve and a second guide slope disposed on the first locking sleeve and abutting against the first guide slope, and the second guide structure includes a third guide slope disposed on the second drive sleeve and a fourth guide slope disposed on the second locking sleeve and abutting against the third guide slope.

[0013] As one of the preferred embodiments of this utility model, the first locking sleeve is provided with a first annular groove, the first abutment is disposed in the first annular groove, the second locking sleeve is provided with a second annular groove, and the second abutment is disposed in the second annular groove.

[0014] As one of the preferred embodiments of this utility model, the outer wall of the first locking sleeve is provided with a first guide groove and a second guide groove arranged opposite to each other. The first guide groove and the second guide groove are arranged along the axial direction of the first locking sleeve. The inner wall of the outermost one of the two adjacent telescopic tubes is provided with a first guide rib and a second guide rib. The first guide rib extends into the first guide groove and the second guide rib extends into the second guide groove.

[0015] As one of the preferred embodiments of the present invention, a telescopic support leg further includes a first cover connected to the upper end of the base via a first locking structure, for securing the first drive sleeve and the first locking sleeve to the base.

[0016] As one of the preferred embodiments of this utility model, a telescopic support leg further includes a second cover connected to the lower end of the base via a second locking structure, for limiting the second drive sleeve and the second locking sleeve on the base.

[0017] The beneficial effects of this utility model are as follows: A telescopic support leg includes a pull cable assembly, a transmission assembly, multiple telescopic tubes, and multiple locking / unlocking assemblies. The multiple telescopic tubes are sequentially sleeved and can slide relative to each other axially. The locking / unlocking assemblies are connected between two adjacent telescopic tubes, and the transmission assembly is connected between the locking / unlocking assemblies. The operating handle has a locked state and an unlocked state. One end of the pull cable assembly is connected to the operating handle, and the other end is connected to the transmission assembly. When the operating handle is in the locked state, it can drive the locking / unlocking assemblies through the pull cable assembly and the transmission assembly to lock two adjacent telescopic tubes, thereby restricting the axial sliding of the multiple telescopic tubes. Alternatively, when the operating handle is in the unlocked state, it can drive the locking / unlocking assemblies through the pull cable assembly and the transmission assembly to unlock two adjacent telescopic tubes, allowing the multiple telescopic tubes to slide axially to extend or shorten. By using a pull cable assembly as the transmission medium, the complex hydraulic components of hydraulic drive and the electronic components of electric drive are eliminated. This not only enables one-button locking / unlocking but also has the advantages of fewer parts and a compact structure, meeting the usage requirements. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model 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 a support frame for quick unlocking in the first state; Figure 2 A schematic diagram of a support frame for quick unlocking in the second state; Figure 3 This is an exploded view of the control handle; Figure 4 This is a cross-sectional view of the operating handle; Figure 5 An exploded view of part of the telescopic outrigger structure; Figure 6 This is a cross-sectional view of the telescopic outrigger; Figure 7 for Figure 6 A magnified view of a portion of region A in the middle; Figure 8 An exploded view of the unlocking component; Figure 9 This is a schematic diagram of the base structure. Detailed Implementation

[0019] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0020] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "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 specifying the number of indicated technical features or their sequential relationship.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0022] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1-9 This utility model provides a support frame for quick unlocking and locking, including a support 100, an operating handle 200, a pull wire assembly 300 and multiple telescopic legs 400, with a central shaft 950 slidably arranged on the support 100. Telescopic outriggers 400 are evenly distributed around the support 100 and their upper ends are hinged to the support 100. The telescopic outriggers 400 include a transmission assembly 410, multiple telescopic tubes 420 and multiple locking and unlocking assemblies 430. The multiple telescopic tubes 420 are sequentially sleeved and can slide relative to each other axially. The locking and unlocking assemblies 430 are connected between two adjacent telescopic tubes 420. The transmission assembly 410 is connected between the locking and unlocking assemblies 430. The operating handle 200 is mounted on the support 100 and has a locked state and an unlocked state; One end of the cable assembly 300 is connected to the operating handle 200, and the other end is connected to the transmission assembly 410; When the operating handle 200 is in the locked state, it can drive the unlocking and locking assembly 430 through the pull cable assembly 300 and the transmission assembly 410 to lock two adjacent telescopic tubes 420, thereby restricting the axial sliding of multiple telescopic tubes 420. Alternatively, when the operating handle 200 is in the unlocked state, it can drive the unlocking and locking assembly 430 through the pull cable assembly 300 and the transmission assembly 410 to unlock two adjacent telescopic tubes 420, thereby allowing multiple telescopic tubes 420 to slide axially to extend or slide axially to shorten.

[0024] Reference Figures 1-2 Taking a support frame with three telescopic legs 400 as an example, the corresponding cable assembly 300 includes a first cable 310, a second cable 320, and a third cable 330. The first cable 310, second cable 320, and third cable 330 are connected one-to-one with the transmission assemblies 410 on the three telescopic legs 400. The operating handle 200 is normally in a locked state. At this time, the operating handle 200 will simultaneously extend the first cable 310, second cable 320, and third cable 330, thereby simultaneously driving the three sets of transmission assemblies 410. Each set of transmission assemblies 410 simultaneously drives all the unlocking and locking assemblies 430 on that telescopic leg 400 to lock two adjacent telescopic tubes 420, thereby restricting the axial sliding of multiple telescopic tubes 420 and realizing the telescopic leg... The length is fixed at 400. When the operating handle 200 enters the unlocked state, it will simultaneously pull the first pull cable 310, the second pull cable 320, and the third pull cable 330, thereby simultaneously driving the three sets of transmission components 410 to move. Each set of transmission components 410 simultaneously drives all the unlocking and locking components 430 on the telescopic leg 400 to unlock two adjacent telescopic tubes 420, so that multiple telescopic tubes 420 slide axially to extend or shorten axially. When the operating handle 200 is no longer in use, it automatically enters the locked state. It should be noted that the outermost one of two adjacent telescopic tubes 420 is the outer tube, and the innermost one of two adjacent telescopic tubes 420 is the inner tube. The inner tube in the previous stage becomes the outer tube in the next stage, and so on.

[0025] Reference Figures 3-4In some embodiments, the operating handle 200 includes a base 210, a trigger 220, a slider 230, a pressure block 240, and a first elastic element 250; one end of the trigger 220 is hinged to the base 210, and the other end extends outward; the slider 230 is slidably disposed within the base 210, and one end of the pull cable assembly 300 is connected to the slider 230; the pressure block 240 is slidably disposed within the base 210 and abuts against the slider 230, and at least a portion of the pressure block 240 extends outside the base 210 and abuts against the trigger 250. The middle section of the trigger 220 abuts against the block 240; the first elastic element 250 abuts between the slider 230 and the seat 210, and is used to provide a driving force for the slider 230 to reset; the trigger 220 can release the push on the pressure block 240 when it is rotated outward, so that the slider 230 extends the pull wire assembly 300 outward under the action of the first elastic element 250 to enter the locked state, or the trigger 220 can push the pressure block 240 when it is rotated inward, so that the slider 230 pulls the pull wire assembly 300 inward to enter the unlocked state.

[0026] Specifically, the operating handle 200 is normally in the locked state, and the trigger 220 is in the outward rotation state. The middle section of the trigger 220 abuts against the upper end of the pressure block 240. When the operating trigger 220 is rotated inward, it will push the pressure block 240, forcing it to move inward. The pressure block 240 will then push the slider 230 to slide within the base 210. The slider 230 will pull the cable assembly 300 inward, thereby simultaneously driving the three sets of transmission components 410 to operate. Each set of transmission components 410 simultaneously drives all the locking and unlocking components 430 on the telescopic support leg 400 to unlock two adjacent components. Telescopic tubes 420 allow multiple telescopic tubes 420 to slide axially to extend or shorten. When the trigger 220 is released, the slider 230 resets under the action of the first elastic element 250, thereby pushing the pressure block 240 and the trigger 220 to reset. The reset of the slider 230 also causes the pull cable assembly 300 to extend outward, thereby simultaneously driving the three sets of transmission assemblies 410 to move. Each set of transmission assemblies 410 simultaneously drives all the unlocking and locking assemblies 430 on the telescopic leg 400 to lock two adjacent telescopic tubes 420, thereby restricting the axial sliding of multiple telescopic tubes 420 and fixing the length of the telescopic leg 400.

[0027] Reference Figures 3-4In some embodiments, an adjustment component 260 is provided between the seat 210, the slider 230, and the cable assembly 300 to adjust the tension of the cable assembly 300. Preferably, the adjustment component 260 includes an adjustment seat 261, an adjustment block 262, and a screw 263. The adjustment seat 261 abuts against the side of the slider 230 facing away from the cable assembly 300, and the first elastic element 250 abuts between the adjustment seat 261 and the seat 210. The adjustment block 262 is slidably disposed on the adjustment seat 261, and one end of the cable assembly 300 passes through the slider 230 and is connected to the adjustment block 262. The screw 263 passes through the adjustment seat 261 and is threadedly connected to the adjustment block 262 to adjust the position of the adjustment block 262 on the adjustment seat 261.

[0028] Specifically, during adjustment, if the locking force of the unlocking assembly 430 is too small, the screw 263 is rotated, causing the adjusting block 262 to move away from the slider 230, thereby pulling the cable assembly 300 inward a certain distance, thus increasing the locking force of the unlocking assembly 430. If the locking force of the unlocking assembly 430 is too large, the screw 263 is rotated in the opposite direction, causing the adjusting block 262 to move towards the slider 230, thereby extending the cable assembly 300 outward a certain distance, thus reducing the locking force of the unlocking assembly 430. It should be noted that the adjusting seat 261 always remains in contact with the slider 230, that is, when the pressure block 240 pushes the slider 230, it will drive the adjusting seat 261, the adjusting block 262 and the screw 263 to move synchronously as a whole.

[0029] Reference Figures 3-4 In some embodiments, a folding assembly 270 is provided between the trigger 220 and the base 210, so that the trigger 220 has a folded state and an operating state. The trigger 220 can enter the folded state when rotated inward, so that at least a portion of the pressure block 240 is received within the trigger 220; or, the trigger 220 can enter the operating state when rotated outward, so that the middle section of the trigger 220 abuts against the pressure block 240. Preferably, the folding assembly 270 includes a pivot 271, a flip block 272, and a lever 273; the trigger 220 is provided with a first receiving groove 221 and a second receiving groove 222; the pivot 271 is rotatably disposed in the first receiving groove 221. Inside 21; one end of the flip block 272 is connected to the rotating shaft 271 and the other end extends outward; the dial 273 is connected to the rotating shaft 271 and has a first position and a second position; when the dial 273 is in the first position, it can drive the flip block 272 to be received in the first receiving groove 221 through the rotating shaft 271, so that the trigger 220 can be rotated inward to enter the folded state, so that at least part of the pressure block 240 is received in the second receiving groove 222, or, when the trigger 220 is rotated outward to enter the operating state, the dial 273 can drive the flip block 272 to be moved out of the first receiving groove 221 through the rotating shaft 271, so that the flip block 272 abuts against the pressure block 240.

[0030] The trigger 220 can be folded inward relative to the base 210, thereby reducing the size of the operating handle 200 when the support frame is not used. Specifically, when the trigger 220 needs to be folded (at this time, the trigger 220 is in an outward rotating state), the operating knob 273 drives the rotating shaft 271 and the flip block 272 to rotate synchronously until the flip block 272 is received in the first receiving groove 221, that is, the flip block 272 separates from the pressure block 240 and does not obstruct the inward rotation of the trigger 220. At this time, the trigger 220 is rotated inward again until it is in contact with the base 210, and the pressure block 240 is received in the second receiving groove 222. When the operating handle 200 needs to be used, the trigger 220 is rotated outward, and... The reverse operation of the dial 273 drives the rotating shaft 271 and the flip block 272 to rotate synchronously until the flip block 272 moves out of the first receiving groove 221 and abuts against the upper end of the pressure block 240. In a further embodiment, the rotating shaft 271 is provided with a first retaining member 274 that is connected to the trigger 220 and the flip block 272 respectively. This retaining member provides a driving force for the flip block 272 to move out of the first receiving groove 221 when the trigger 220 is in the operating state. That is, when the trigger 220 is turned outward, the flip block 272 will automatically move out of the first receiving groove 221 under the action of the first retaining member 274, without the need to operate the dial 273 separately, thus simplifying the steps of use. Preferably, the first retaining member 274 is a torsion spring.

[0031] Reference Figures 3-4 In some embodiments, the dial 273 is provided with an adjustment groove, and one end of the rotating shaft 271 is provided with an adjustment boss 281. It also includes a locking screw 282, which can lock onto the dial 273 and the rotating shaft 271 when the adjustment boss 281 is inserted into the adjustment groove, so as to adjust the relative angle between the dial 273 and the rotating shaft 271. Preferably, the adjustment groove is provided as an internal hexagonal groove, and the adjustment boss 281 is provided as an external hexagonal boss. This configuration can adjust the angle of the dial 273, thereby avoiding interference with the rotation of the trigger 220 due to the incorrect angle of the dial 273.

[0032] Reference Figures 3-4 In some embodiments, a second retainer 290 is provided between one end of the trigger 220 and the base 210 to keep the trigger 220 in the closed folded state.

[0033] Reference Figures 3-4 In some embodiments, a roller 241 is provided at the upper end of the pressure block 240, and the middle section of the trigger 220 abuts against the roller 241; this arrangement can reduce the friction between the trigger 220 and the pressure block 240 when the trigger 220 is rotated inward, thereby reducing wear.

[0034] Reference Figure 5In some embodiments, the transmission assembly 410 includes a transmission rod 411, a gear 412, a rack 413, and a second elastic element 414; the transmission rod 411 passes through the telescopic tube 420 and is connected to the unlocking and locking assembly 430; the gear 412 is connected to the upper end of the transmission rod 411; the rack 413 meshes with the gear 412, and the other end of the pull cable assembly 300 is connected to the rack 413; the second elastic element 414 abuts against the rack 413 to provide driving force for the rack 413 to reset; the operating hand... When the handle 200 is in the locked state, the rack 413 can be driven to move in the first direction by the pull cable assembly 300, so as to drive the gear 412 and the transmission rod 411 to rotate in the forward direction, causing the unlocking and locking assembly 430 to lock two adjacent telescopic tubes 420. Alternatively, when the operating handle 200 is in the unlocked state, the rack 413 can move in the second direction under the action of the second elastic member 414, so as to drive the gear 412 and the transmission rod 411 to rotate in the reverse direction, causing the unlocking and locking assembly 430 to unlock two adjacent telescopic tubes 420.

[0035] Reference Figures 6-9 In some embodiments, the locking / unlocking assembly 430 includes a base 431, a first drive sleeve 432, a first locking sleeve 433, a second drive sleeve 434, a second locking sleeve 435, and a third elastic element 436; the base 431 is mounted on the inner side of one of two adjacent telescopic tubes 420 and is recessed inward in the middle section, and the transmission assembly 410 passes through the base 431; the first drive sleeve 432 is disposed at the upper end of the base 431 and connected to the transmission assembly 410; the first A locking sleeve 433 is fitted onto the base 431 and connected to the first driving sleeve 432. The first locking sleeve 433 has several circumferentially arranged first abutment members 437. A second driving sleeve 434 is located at the lower end of the base 431 and connected to the transmission assembly 410. A second locking sleeve 435 is fitted onto the base 431 and connected to the first driving sleeve 432. The second locking sleeve 435 has several circumferentially arranged second abutment members 438. A third elastic member 436 abuts... The operating handle 200 is held between the first locking sleeve 433 and the second locking sleeve 435. When in the locked state, the operating handle 200 can drive the first driving sleeve 432 and the second driving sleeve 434 to rotate forward through the pull cable assembly 300 and the transmission assembly 410, forcing the first locking sleeve 433 and the second locking sleeve 435 to move in opposite directions, causing the first abutment 437 and the second abutment 438 to abut against the inner wall of the outermost one of the two adjacent telescopic tubes 420, thereby restricting the axial sliding of the two adjacent telescopic tubes 420. When in the unlocked state, the operating handle 200 can drive the first driving sleeve 432 and the second driving sleeve 434 to rotate in opposite directions through the pull cable assembly 300 and the transmission assembly 410, forcing the first locking sleeve 433 and the second locking sleeve 435 to move towards each other, causing the first abutment 437 and the second abutment 438 to separate from the inner wall of the outermost one of the two adjacent telescopic tubes 420, so that the multiple telescopic tubes 420 can slide axially to extend or slide axially to shorten.

[0036] Specifically, when the operating handle 200 enters the locked state, it will drive the transmission component 410 to move via the pull cable assembly 300. Specifically, the pull cable assembly 300 drives the transmission rod 411 to rotate in the forward direction. Since the first drive sleeve 432 and the second drive sleeve 434 are both sleeved on the transmission rod 411 and rotate synchronously with the transmission rod 411, and a first guide structure 510 is provided between the first drive sleeve 432 and the first locking sleeve 433, and a second guide structure 520 is provided between the second drive sleeve 434 and the second locking sleeve 435, the guiding direction of the first guide structure 510 is opposite to the guiding direction of the second guide structure 520, thereby realizing the opposite movement of the first drive sleeve 432 and the second drive sleeve 434. At this time, the first abutment member 437 and the second abutment member 438 will... Under the pushing action of the outer wall of the base 431, it will move radially outward and press against the inner wall of the outer tube in the two adjacent telescopic tubes 420, thereby restricting the axial sliding between the two adjacent telescopic tubes 420. When the operating handle 200 enters the unlocked state, it will drive the transmission component 410 to move through the pull cable assembly 300. Specifically, the pull cable assembly 300 drives the transmission rod 411 to rotate in the opposite direction. At this time, the opposing movement of the first drive sleeve 432 and the second drive sleeve 434, due to the inward indentation of the middle section of the base 431, will cause the first abutment 437 and the second abutment 438 to move radially inward and separate from the inner wall of the outer tube in the two adjacent telescopic tubes 420, thereby allowing the two adjacent telescopic tubes 420 to slide axially, realizing the extension or shortening of the telescopic leg 400.

[0037] Reference Figures 6-9 In some embodiments, the first guide structure 510 includes a first guide slope 511 disposed on the first drive sleeve 432 and a second guide slope 512 disposed on the first locking sleeve 433 and abutting against the first guide slope 511. The second guide structure 520 includes a third guide slope 521 disposed on the second drive sleeve 434 and a fourth guide slope 522 disposed on the second locking sleeve 435 and abutting against the third guide slope 521. The inclination directions of the first guide slope 511 and the second guide slope 512 are opposite to the inclination directions of the third guide slope 521 and the fourth guide slope 522, so that the first locking sleeve 433 and the second locking sleeve 435 move in opposite directions when the transmission rod 411 rotates in the forward direction, or the first locking sleeve 433 and the second locking sleeve 435 move towards each other when the transmission rod 411 rotates in the reverse direction.

[0038] Reference Figures 6-9In some embodiments, a first annular groove 610 is provided on the first locking sleeve 433, and a first abutment 437 is disposed in the first annular groove 610. A second annular groove 620 is provided on the second locking sleeve 435, and a second abutment 438 is disposed in the second annular groove 620. In a further embodiment, multiple first annular grooves 610 are provided and arranged at intervals along the circumference of the first locking sleeve 433, and multiple second annular grooves 620 are provided and arranged at intervals along the circumference of the second locking sleeve 435. This arrangement can improve the stability of the first abutment 437 and the second abutment 438 in the first annular groove 610 and the second annular groove 620 respectively, which is beneficial to improving the stability of the unlocking and locking assembly 430 during unlocking and locking.

[0039] Reference Figures 6-9 In some embodiments, the outer wall of the first locking sleeve 433 is provided with a first guide groove 710 and a second guide groove arranged opposite to each other. The first guide groove 710 and the second guide groove are arranged along the axial direction of the first locking sleeve 433. The inner wall of the outermost one of the two adjacent telescopic tubes 420 is provided with a first guide rib and a second guide rib. The first guide rib extends into the first guide groove 710 and the second guide rib extends into the second guide groove. This arrangement enables the rotational motion of the first locking sleeve 433 to be converted into linear motion in the axial direction of the base 431.

[0040] Reference Figures 6-9 In some embodiments, the outer side wall at the lower end of the base 431 is provided with a third guide groove 720 and a fourth guide groove arranged opposite to each other. The third guide groove 720 and the fourth guide groove are arranged along the axial direction of the second locking sleeve 435. The second locking sleeve 435 is provided with a third guide rib 730 extending into the third guide groove 720 and a fourth guide rib extending into the fourth guide groove. This arrangement enables the rotational motion of the second locking sleeve 435 to be converted into linear motion in the axial direction of the base 431.

[0041] Reference Figures 6-9In some embodiments, a quick-locking support frame further includes a first cover 820 connected to the upper end of the base 431 via a first locking structure 810, for securing the first drive sleeve 432 and the first locking sleeve 433 to the base 431; preferably, the first locking structure 810 includes a first connecting rib 811 and a second connecting rib 812 disposed opposite to each other on the first cover 820; the upper end of the base 431 is provided with a first slot 813 and a second slot 814 disposed opposite to each other; the lower end of the first connecting rib 811 is provided with a locking mechanism. A first engaging portion 815 is located in the first slot 813; a second engaging portion 816 is provided at the lower end of the second connecting rib 812 and is engaged in the second slot 814; the first cover 820 abuts against the upper ends of the first driving sleeve 432 and the first locking sleeve 433; in a further embodiment, the first driving sleeve 432 is provided with an inner and outer through groove 900 and an upper through groove, and the first connecting rib 811 can be axially inserted into the through groove 900 and radially slid within the through groove 900 so that the first engaging portion 815 is engaged in the first slot 813.

[0042] Specifically, during assembly, the first locking sleeve 433 and the first driving sleeve 432 are first installed onto the base 431 in sequence. Then, the direction of the first driving sleeve 432 is adjusted so that the clearance groove 900 on the first driving sleeve 432 is aligned with the first slot 813 on the base 431. Next, the first cover 820 is inserted into the base 431 from top to bottom, so that the first connecting rib 811 on the first cover 820 is inserted into the clearance groove 900 and the second connecting rib 812 on the first cover 820 is located inside the base 431. Then, the first cover 820 is slid radially along the base 431 so that the first locking part 815 is engaged in the first slot 813 and the second locking part 816 is engaged in the second slot 814, thereby restricting the axial separation of the first cover 820 from the base 431. The radial restriction of the first cover 820 is accomplished by the telescopic tube 420.

[0043] Reference Figures 6-9 Furthermore, a first guide block 910 is provided on the first connecting rib 811, a second guide block 920 is provided on the second connecting rib 812, and a first guide groove 930 and a second guide groove 940 are provided on the first locking sleeve 433. When the first cover 820 slides radially, the first guide block 910 will extend into the first guide groove 930 and the second guide block 920 will extend into the second guide groove 940, which can serve as the main guide for the first locking sleeve 433. The cooperation between the first guide groove 710 and the first guide rib, and the cooperation between the second guide groove and the second guide rib, serve as the secondary guide, which can reduce the wear of the parts.

[0044] Reference Figures 6-9Furthermore, a quick-locking support frame also includes a second cover 840 connected to the lower end of the base 431 via a second locking structure 830, for securing the second drive sleeve 434 and the second locking sleeve 435 to the base 431; preferably, the second locking structure 830 is configured as a threaded connection structure.

[0045] The advantages of this utility model are: by using a pull-wire assembly as the transmission medium for the photographic bracket, the complex hydraulic components of the hydraulic drive and the electronic components of the electric drive are eliminated. It can not only realize one-button locking and unlocking, but also has the advantages of fewer parts and compact structure, which meets the needs of use.

[0046] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A telescopic support leg, characterized in that: It includes a pull cable assembly (300), a transmission assembly (410), multiple telescopic tubes (420), and multiple locking / unlocking assemblies (430). The multiple telescopic tubes (420) are sequentially sleeved and can slide relative to each other axially. The locking / unlocking assembly (430) is connected between two adjacent telescopic tubes (420), and the transmission assembly (410) is connected between the locking / unlocking assemblies (430). The operating handle (200) has a locked state and an unlocked state; One end of the pull cable assembly (300) is connected to the operating handle (200), and the other end is connected to the transmission assembly (410); When the operating handle (200) is in the locked state, it can drive the unlocking and locking assembly (430) through the pull cable assembly (300) and the transmission assembly (410) to lock two adjacent telescopic tubes (420) to restrict the axial sliding of multiple telescopic tubes (420). Alternatively, when the operating handle (200) is in the unlocked state, it can drive the unlocking and locking assembly (430) through the pull cable assembly (300) and the transmission assembly (410) to unlock two adjacent telescopic tubes (420) to allow multiple telescopic tubes (420) to slide and extend or slide and shorten axially.

2. A telescoping foot according to claim 1, wherein: The pull cable assembly (300) includes a first pull cable (310), a second pull cable (320) and a third pull cable (330), and the telescopic support leg (400) is set to 3, which correspond one-to-one with the first pull cable (310), the second pull cable (320) and the third pull cable (330).

3. A telescoping foot according to claim 1, wherein: The transmission assembly (410) includes a transmission rod (411), a gear (412), a rack (413), and a second elastic element (414). The transmission rod (411) passes through the telescopic tube (420) and is connected to the locking / unlocking assembly (430); The gear (412) is connected to the upper end of the transmission rod (411); The rack (413) meshes with the gear (412), and the other end of the pull cable assembly (300) is connected to the rack (413); The second elastic element (414) abuts against the rack (413) to provide a driving force for the rack (413) to reset; When the operating handle (200) is in the locked state, the rack (413) can be driven to move in the first direction by the pull cable assembly (300) to drive the gear (412) and the transmission rod (411) to rotate in the forward direction, so that the locking / unlocking assembly (430) locks the two adjacent telescopic tubes (420). Alternatively, when the operating handle (200) is in the unlocked state, the rack (413) can move in the second direction under the action of the second elastic member (414) to drive the gear (412) and the transmission rod (411) to rotate in the reverse direction, so that the locking / unlocking assembly (430) unlocks the two adjacent telescopic tubes (420).

4. A telescoping foot according to claim 1, wherein: The unlocking and locking assembly (430) includes a base (431), a first drive sleeve (432), a first locking sleeve (433), a second drive sleeve (434), a second locking sleeve (435), and a third elastic element (436). The base (431) is installed on the inner side of one of the two adjacent telescopic tubes (420) and the middle section is recessed inward. The transmission assembly (410) passes through the base (431). The first drive sleeve (432) is disposed at the upper end of the base (431) and connected to the transmission assembly (410); The first locking sleeve (433) is sleeved on the base (431) and connected to the first driving sleeve (432). The first locking sleeve (433) is provided with a plurality of circumferentially arranged first abutment members (437). The second drive sleeve (434) is disposed at the lower end of the base (431) and connected to the transmission assembly (410); The second locking sleeve (435) is sleeved on the base (431) and connected to the first driving sleeve (432). The second locking sleeve (435) is provided with a plurality of circumferentially arranged second abutment members (438). The third elastic element (436) abuts against the first locking sleeve (433) and the second locking sleeve (435); When the operating handle (200) is in the locked state, it can drive the first drive sleeve (432) and the second drive sleeve (434) to rotate in the forward direction through the pull cable assembly (300) and the transmission assembly (410), forcing the first locking sleeve (433) and the second locking sleeve (435) to move in opposite directions, causing the first abutment (437) and the second abutment (438) to abut against the inner wall of the outermost one of the two adjacent telescopic tubes (420), thereby restricting the axial sliding of the two adjacent telescopic tubes (420); When the operating handle (200) is in the unlocked state, it can drive the first drive sleeve (432) and the second drive sleeve (434) to rotate in opposite directions through the pull cable assembly (300) and the transmission assembly (410), forcing the first locking sleeve (433) and the second locking sleeve (435) to move towards each other, causing the first abutment (437) and the second abutment (438) to separate from the inner wall of the outermost one of the two adjacent telescopic tubes (420), so that the plurality of telescopic tubes (420) can slide axially to extend or slide axially to shorten.

5. A telescoping foot according to claim 4, wherein: A first guide structure (510) is provided between the first drive sleeve (432) and the first locking sleeve (433), and a second guide structure (520) is provided between the second drive sleeve (434) and the second locking sleeve (435). The guiding direction of the first guide structure (510) is opposite to the guiding direction of the second guide structure (520).

6. A telescoping foot according to claim 5, wherein: The first guide structure (510) includes a first guide slope (511) disposed on the first drive sleeve (432) and a second guide slope (512) disposed on the first locking sleeve (433) and abutting against the first guide slope (511). The second guide structure (520) includes a third guide slope (521) disposed on the second drive sleeve (434) and a fourth guide slope (522) disposed on the second locking sleeve (435) and abutting against the third guide slope (521).

7. A telescoping foot according to claim 4 wherein: The first locking sleeve (433) is provided with a first annular groove (610), and the first abutment (437) is provided in the first annular groove (610). The second locking sleeve (435) is provided with a second annular groove (620), and the second abutment (438) is provided in the second annular groove (620).

8. A telescopic support leg according to claim 4, characterized in that: The outer wall of the first locking sleeve (433) is provided with a first guide groove (710) and a second guide groove arranged opposite to each other. The first guide groove (710) and the second guide groove are arranged along the axial direction of the first locking sleeve (433). The inner wall of the outermost one of the two adjacent telescopic tubes (420) is provided with a first guide rib and a second guide rib. The first guide rib extends into the first guide groove (710) and the second guide rib extends into the second guide groove.

9. A telescoping foot according to claim 4, wherein: It also includes a first cover (820) connected to the upper end of the base (431) via a first locking structure (810) for securing the first drive sleeve (432) and the first locking sleeve (433) on the base (431).

10. A telescoping foot according to claim 4, wherein: It also includes a second cover (840) connected to the lower end of the base (431) via a second locking structure (830) for securing the second drive sleeve (434) and the second locking sleeve (435) on the base (431).

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