Leg of a photographic support and tripod using it

Abstract

This invention discloses a tripod leg for a photography support, comprising: a mounting base, foot pads, a telescopic tube assembly consisting of multiple nested telescopic tubes, an airflow chamber, an opening and closing mechanism, and tube sections. The telescopic tube assembly integrates an airflow chamber, whose two ends are connected to the outside via a first airflow channel. The opening and closing mechanism controls the opening and closing of the channel. Tube sections with moving parts are positioned between adjacent tubes. Changes in air pressure within the airflow chamber drive the moving parts to elastically deform, tightening the tubes to achieve telescopic locking. A pneumatic bidirectional self-locking mechanism is used, allowing for easy unlocking and locking with only the opening and closing mechanism. The locking force automatically adjusts with the load. Tripods using this leg offer high setup efficiency, good stability, and are suitable for various shooting scenarios and ground environments.

Description

Technical Field

[0001] This invention relates to the field of photographic equipment, and in particular to a support leg for a photographic stand and a tripod using the same. Background Technology

[0002] Currently, the telescopic locking mechanism of camera tripod legs primarily employs a mechanical locking system. Mechanical locking typically uses a knob-type structure. By rotating the knurled knob on the leg sleeve, the internal threaded structure pushes a conical locking sleeve axially, causing it to expand radially and evenly grip the inner sleeve from all sides, using friction to achieve locking. This type of structure generally requires the user to unlock and lock each leg section sequentially, making the locking and unlocking process for the overall telescopic state of the legs quite cumbersome. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a support leg for a photographic bracket that can be easily locked or unlocked in its overall extension / retraction state.

[0004] The present invention also proposes a tripod with the legs of the above-mentioned photographic support.

[0005] According to a first aspect of the present invention, the support leg of a photographic bracket includes: a mounting base, foot pads, a telescopic tube assembly, an airflow chamber, and an opening and closing mechanism; the telescopic tube assembly includes a plurality of sleeves nested together in sequence, and two adjacent sleeves are axially slidable relative to each other, thereby causing the telescopic tube assembly to extend or shorten; the mounting base and the foot pads are connected to the two ends of the telescopic tube assembly in a one-to-one correspondence, and the telescopic tube assembly can drive the mounting base and the foot pads to move closer or further apart relative to each other when it extends or extends; the airflow chamber is disposed within the telescopic tube assembly; when the telescopic tube assembly extends or shortens, the airflow chamber can expand or shrink; the airflow chamber is connected to an airflow channel, and the airflow channel is connected to the atmospheric ring. The opening and closing mechanism is disposed on the mounting base, the telescopic tube assembly, or the foot pad. The airflow channel is connected to the opening and closing mechanism, which can control the airflow channel to communicate with or be relatively disconnected from the airflow chamber. When the airflow channel is relatively disconnected from the airflow chamber, the airflow chamber is in a closed state. At least one tube segment is disposed between each pair of adjacent sleeves. The tube segment is provided with a moving part. The airflow chamber is connected to the moving part. The airflow chamber can apply air pressure to the moving part, causing the moving part to move or deform relative to the airflow chamber. When the moving part moves or deforms, it can lock the two adjacent sleeves relatively.

[0006] The outriggers of the photographic support according to embodiments of the present invention have at least the following beneficial effects: When the length of the outriggers needs to be adjusted, the opening and closing mechanism opens the airflow channel and the airflow chamber, allowing the airflow chamber to communicate with the outside atmosphere. At this time, the moving part is in a natural state, there is no clamping force between adjacent sleeves, and each sleeve can slide axially, changing the total length of the telescopic tube assembly. After adjustment, the opening and closing mechanism closes the airflow channel and the airflow chamber forms a closed space. If the outriggers are subjected to load and have a relative sliding tendency, the change in the volume of the airflow chamber will cause internal air pressure fluctuations, thereby driving the moving part to move or deform, clamping against the inner wall of the adjacent sleeve. When the sliding tendency of the sleeve causes the volume of the airflow chamber to shrink, the internal air pressure increases, and the moving part expands outward to enhance the clamping force; when the sliding tendency of the sleeve causes the volume of the airflow chamber to expand, a negative pressure is formed inside, and the external atmospheric pressure further compresses the moving part, achieving bidirectional self-locking. Therefore, the outrigger does not require the user to adjust each sleeve section by section. The user only needs to control the opening and closing mechanism to lock or unlock the overall telescopic state, which can effectively simplify the adjustment action and greatly improve the adjustment efficiency of the outrigger length.

[0007] According to some embodiments of the present invention, the opening and closing mechanism includes a switch movably disposed on the mounting base, a seat body is provided at the end of the telescopic tube assembly, a movable member is provided on the seat body, and the airflow channel is disposed on the movable member; the switch body is provided with a guide slope, and when the switch body moves, it can push the movable member through the guide slope, so that the airflow chamber and the airflow channel are interconnected or relatively isolated; the seat body or the switch body is provided with a reset part, and the reset part is used to drive the airflow channel to move and reset.

[0008] According to some embodiments of the present invention, the reset part includes a reset spring disposed on the seat, the reset spring being connected to the movable member; the reset spring is capable of driving the movable member to move through its own elasticity, thereby isolating the airflow channel and the airflow chamber from each other.

[0009] According to some embodiments of the present invention, the movable component is equipped with a washer, and when the return spring pushes the movable component to move back to its original position, the movable component can be pressed against the seat body by the washer.

[0010] According to some embodiments of the present invention, the switch element is provided with a ventilation channel, which is connected to the airflow channel; the mounting base is provided with an air intake channel, one end of which is connected to the atmospheric environment, and the other end of which is connected to the ventilation channel.

[0011] According to some embodiments of the present invention, the telescopic tube assembly is provided with a movable cavity, which is connected to the atmospheric environment; the innermost sleeve is provided with a movable part and a pressing part; the movable cavity and the airflow chamber are respectively located on both sides of the movable part; when a pressure difference is formed between the movable cavity and the airflow chamber, the movable part can be pushed by the pressure difference and cause the pressing part to elastically deform; the airflow channel is set as the gap between the two innermost sleeves; when the pressing part elastically deforms, it can press against the inner wall of the sleeve located on its outer side; when the pressing part elastically deforms, it can close the airflow channel.

[0012] According to some embodiments of the present invention, the tube section includes a rotating ring, a stationary ring, and an elastic sealing sleeve. The stationary ring is installed at the end of the sleeve, and the rotating ring is movably installed on the stationary ring. Both the rotating ring and the stationary ring are installed inside the sealing sleeve. The airflow chamber passes through the rotating ring and the stationary ring. The moving part is configured as the outer wall of the sealing sleeve. When the air pressure in the airflow chamber changes, the rotating ring can be driven by the air pressure difference and push against the sealing sleeve, so that the outer wall of the sealing sleeve is pressed tightly against the sleeve outside the sealing sleeve.

[0013] According to some embodiments of the present invention, a first anti-slip sleeve is installed on the outer periphery of the stationary ring, and a second anti-slip sleeve is provided at the end of each sleeve; when one of the two adjacent sleeves slides axially relative to the other sleeve, the first anti-slip sleeve and the second anti-slip sleeve move closer or further apart relative to each other; when the first anti-slip sleeve and the second anti-slip sleeve move closer to each other relative to each other, they can move to be relatively tight and axially fixed.

[0014] According to some embodiments of the present invention, the foot pad is detachably mounted with floor pegs.

[0015] According to a second aspect of the present invention, a tripod includes the legs of a photographic support according to the first aspect of the present invention described above.

[0016] The tripod according to embodiments of the present invention has at least the following beneficial effects: When the length of the outriggers needs to be adjusted, the opening and closing mechanism opens the airflow channel and the airflow chamber, allowing the airflow chamber to communicate with the outside atmosphere. At this time, the moving part is in a natural state, there is no clamping force between adjacent sleeves, and each sleeve can slide axially, changing the total length of the telescopic tube assembly. After adjustment, the opening and closing mechanism closes the airflow channel and the airflow chamber forms a closed space. If the outriggers are subjected to load and have a relative sliding tendency, the change in the volume of the airflow chamber will cause internal air pressure fluctuations, thereby driving the moving part to move or deform, clamping against the inner wall of the adjacent sleeves. When the sliding tendency causes the volume of the airflow chamber to shrink, the internal air pressure increases, and the moving part expands outward to enhance the clamping force; when the sliding tendency causes the volume of the airflow chamber to expand, a negative pressure is formed inside, and the external atmospheric pressure further compresses the moving part, achieving bidirectional self-locking. Thus, the outriggers do not require the user to adjust each sleeve section by section; only the opening and closing mechanism needs to be controlled to lock or unlock the overall telescopic state. Therefore, the adjustment action can be effectively simplified, and the adjustment efficiency of the outrigger length can be greatly improved.

[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 a tripod according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the support legs of the camera bracket according to an embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram showing the interior of the legs of the camera support; Figure 4 for Figure 3 An enlarged schematic diagram of point A is shown; Figure 5 for Figure 2 A schematic diagram of the innermost layer of the support legs of the camera bracket is shown; Figure 6 for Figure 2 A schematic diagram showing the on / off switch of the support leg of the camera bracket; Figure 7 for Figure 1 A schematic diagram of the tubular section of the support leg of the camera bracket is shown; Reference numerals: Mounting base 100; Air inlet channel 110; Opening and closing mechanism 300; Switch 310; Guide slope 330; Ventilation channel 350; Moving part 400; Washer 470; Reset part 490; Reset spring 495; Telescopic tube assembly 500; Seat body 530; Sleeve 550; Airflow chamber 560; Second anti-slip sleeve 590; Tube section body 600; Dynamic ring 610; Static ring 620; Sealing sleeve 630; First anti-slip sleeve 640; Ball bearing 660; Pressing part 680; Moving part 690; Foot pad 700; Ground nail 750; Moving cavity 800; Airflow channel 900; Detailed Implementation Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

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

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1 and Figure 2A camera bracket leg includes: a mounting base 100, foot pads 700, a telescopic tube assembly 500, an airflow chamber 560, and an opening and closing mechanism 300; the telescopic tube assembly 500 includes multiple sleeves 550 nested together in sequence, and adjacent sleeves 550 can slide relative to each other axially, causing the telescopic tube assembly 500 to extend or shorten; the mounting base 100 and foot pads 700 are connected to the two ends of the telescopic tube assembly 500 in a one-to-one correspondence, and when the telescopic tube assembly 500 extends or shortens, it can drive the mounting base 100 and foot pads 700 to move closer or further apart relative to each other; the airflow chamber 560 is disposed within the telescopic tube assembly 500; when the telescopic tube assembly 500 extends or shortens, it can cause the airflow chamber 560 to expand or shrink; the airflow chamber 560 is connected to an airflow channel 900, and the airflow channel 900... 0. Connected to the atmospheric environment; the opening and closing mechanism 300 is provided on the mounting base 100, the telescopic tube assembly 500 or the foot pad 700, the airflow channel 900 is connected to the opening and closing mechanism 300, and the opening and closing mechanism 300 can control the airflow channel 900 to connect with or relatively disconnect from the airflow chamber 560; when the airflow channel 900 is relatively disconnected from the airflow chamber 560, the airflow chamber 560 is in a closed state; at least one tube section 600 is provided between each two adjacent sleeves 550, the tube section 600 is provided with a moving part, the airflow chamber 560 is connected to the moving part, the airflow chamber 560 can apply air pressure to the moving part, and make the moving part move or deform relative to the airflow chamber 560; when the moving part moves or deforms, it can lock the two adjacent sleeves 550 relative to each other. When the outrigger length needs adjustment, the opening and closing mechanism 300 opens the airflow channels 900 and 901, allowing the airflow chamber 560 to connect with the outside atmosphere. At this time, the moving part is in its natural state, and there is no clamping force between adjacent sleeves 550. Each sleeve 550 can slide axially, changing the total length of the telescopic tube assembly 500. After adjustment, the opening and closing mechanism 300 closes the airflow channels 900 and 901, forming a closed space in the airflow chamber 560. If the outrigger is under load and experiences a relative sliding tendency, the volume change in the airflow chamber 560 will cause internal air pressure fluctuations, which in turn drive the moving part to move or deform, pressing against the inner wall of the adjacent sleeves 550. When the sliding tendency of the sleeves 550 causes the volume of the airflow chamber 560 to decrease, the internal air pressure increases, and the moving part expands outward to enhance the clamping force. When the sliding tendency of the sleeves 550 causes the volume of the airflow chamber 560 to increase, a negative pressure is formed inside, and the external atmospheric pressure further compresses the moving part, achieving bidirectional self-locking. Therefore, the outrigger does not require the user to adjust each sleeve 550 section by section. The user only needs to control the opening and closing mechanism 300 to lock or unlock the overall telescopic state. This effectively simplifies the adjustment action and greatly improves the adjustment efficiency of the outrigger length.

[0023] In some embodiments, reference is made to Figure 2 and 6The opening and closing mechanism 300 includes a switch 310 movably mounted on the mounting base 100, a seat 530 at the end of the telescopic tube assembly 500, a movable member 400 on the seat 530, and an airflow channel 900 disposed on the movable member 400. The switch 310 is provided with a guide ramp 330, which, when moving, pushes the movable member 400 through the guide ramp 330, thereby connecting or isolating the airflow chamber 560 and the airflow channel 900. The seat 530 or the switch 310 is provided with a reset part 490, which is used to drive the airflow channel 900 to reset. When it is necessary to open the airflow channel 900, the user pushes the switch 310 to move in a preset direction, the guide ramp 330 contacts the movable member 400 and converts the linear motion into the axial motion of the movable member 400, thereby connecting the airflow channel 900 and the airflow chamber 560. The ramp structure effectively reduces the force required for operation, allowing the user to complete the operation without applying significant force.

[0024] In practical implementation, the guide slope 330 can be designed with different tilt angles. A small-angle slope requires less operating force but has a longer stroke, while a large-angle slope has a shorter stroke but requires slightly more operating force. This can be flexibly selected according to user operating habits and sealing requirements. The surface of the switch component 310 can be textured with anti-slip material to increase hand friction and prevent slippage during operation. Furthermore, the switch component 310 can be designed as a rotary structure, using rotation to push the movable component 400, further reducing the space occupied by the mounting base 100. A snap-locking structure can also be added, automatically fixing the switch when it moves to the open or closed position to prevent accidental contact that could alter the state of the airflow channel 900.

[0025] In some embodiments, reference is made to Figure 4 The reset part 490 includes a reset spring 495 disposed on the base 530, and the reset spring 495 is connected to the movable part 400. The reset spring 495 can drive the movable part 400 to move through its own elasticity, thereby isolating the airflow channel 900 and the airflow chamber 560. When the user pushes the switch 310 to open the channel, the movable part 400 moves axially to compress the reset spring 490 and stores elastic potential energy. After the leg length adjustment is completed, simply release the switch 310, and the reset spring 490 releases its elastic potential energy to drive the movable part 400 to automatically reset, isolating the airflow channel 900 from the airflow chamber 560. No additional closing operation is required from the user, effectively avoiding locking failure caused by forgetting to close the channel.

[0026] In practice, the return spring 490 can be replaced with different types such as compression spring, tension spring, and torsion spring. When the installation space is limited, compression spring is preferred, and torsion spring can be used when the moving part 400 is rotating.

[0027] In some embodiments, reference is made to Figure 4The movable component 400 is fitted with a washer 470. When the return spring 495 pushes the movable component 400 to its reset position, the movable component 400 can be pressed tightly against the seat 530 through the washer 470. When the return spring 490 drives the movable component 400 to reset and close the channel, the washer 470 fills the tiny gap between the movable component 400 and the seat 530, forming a tight sealing surface and blocking the airflow leakage path. The washer 470 has good elasticity and can automatically compensate for machining errors and wear during use, maintaining a stable sealing effect even after long-term use. At the same time, the washer 470 avoids direct contact between the movable component 400 and the seat 530, reducing friction and wear between the two and extending the service life of the core components.

[0028] In practical implementation, gasket 470 can be made of different materials such as nitrile rubber, silicone rubber, fluororubber, and polytetrafluoroethylene. The structure of gasket 470 can be O-ring, flat gasket 470, lip seal, V-ring, etc.

[0029] In some embodiments, reference is made to Figure 4 The switch 310 is equipped with a ventilation channel 350, which is connected to the airflow channel 900. The mounting base 100 is equipped with an air intake channel 110, one end of which is connected to the atmospheric environment, and the other end of which is connected to the ventilation channel 350. When the opening and closing mechanism 300 opens the airflow channel 900, the airflow chamber 560 is connected to the outside through the airflow channel 900, the ventilation channel 350, and the air intake channel 110 in sequence. Air can freely enter and exit, keeping the air pressure inside and outside the chamber balanced. The telescopic tube assembly 500 extends and retracts without jamming or excessive resistance. The ventilation channel 350 is integrated into the switch 310, and the air intake channel 110 is integrated into the mounting base 100, eliminating the need for additional piping and simplifying the overall structure. The opening of the air intake channel 110 is located on the outside of the mounting base 100, effectively preventing dust, moisture, and other impurities from entering the airflow chamber 560 and protecting the internal components.

[0030] In practice, a detachable air filter can be installed at the inlet of the air intake channel 110 to filter dust and moisture in the air, prevent impurities from entering the chamber and wearing parts or clogging the channel. The filter can be cleaned or replaced regularly.

[0031] In some embodiments, reference is made to Figure 5The telescopic tube assembly 500 is provided with a movable cavity 800, which is connected to the atmospheric environment. The innermost sleeve 550 is provided with a movable part 690 and a pressing part 680. The movable cavity 800 and the airflow chamber 560 are located on both sides of the movable part 690. When a pressure difference is formed between the movable cavity 800 and the airflow chamber 560, the movable part 690 can be pushed by the pressure difference and cause the pressing part 680 to elastically deform. The airflow channel 900 is set as the gap between the two innermost sleeves 550. When the pressing part 680 elastically deforms, it can press against the inner wall of the sleeve 550 located on its outer side. When the pressing part 680 elastically deforms, it can close the airflow channel 900. When adjusting the outrigger length, the opening / closing mechanism 300 opens the airflow channel 900, connecting the movable chamber 800 to the outside. There is no pressure difference between the movable chamber 800 and the airflow chamber 560, and the movable part 690 and the pressing part 680 are in their natural state, allowing the telescopic tube assembly 500 to extend and retract freely. After adjustment, the airflow channel 900 and the airflow channel 900 are closed. If the outrigger is under load and tends to slip, the volume of the airflow chamber 560 decreases and the air pressure increases, creating a pressure difference with the movable chamber 800. This causes the movable part 690 to move and push against the pressing part 680, resulting in elastic deformation and tightening the inner wall of the outer sleeve 550 to form the first layer of locking. Simultaneously, the deformation of the pressing part 680 closes the airflow chamber 560, preventing airflow leakage and maintaining high pressure in the chamber to form the second layer of locking. This double-locking structure provides greater locking force, ensuring stable support even under heavy loads, preventing the outrigger from suddenly slipping, and improving safety.

[0032] In practical implementation, the movable part 690 can adopt a piston-type or diaphragm-type structure. The piston-type structure has good sealing performance and large thrust, making it suitable for heavy-duty scenarios; the diaphragm-type structure has high sensitivity and fast response speed, making it suitable for rapid locking requirements. The clamping part 680 can be made of materials such as rubber blocks, elastic metal sheets, or polyurethane elastomers. Rubber blocks have high friction and good elasticity, while elastic metal sheets have high strength and long service life. In addition, multiple clamping parts 680 can be evenly arranged along the circumference of the sleeve 550 to make the clamping force distribution more uniform and prevent the sleeve 550 from deforming under stress.

[0033] In some embodiments, reference is made to Figure 7The pipe section 600 includes a rotating ring 610, a stationary ring 620, and an elastic sealing sleeve 630. The stationary ring 620 is installed at the end of the sleeve 550, and the rotating ring 610 is movably installed on the stationary ring 620. Both the rotating ring 610 and the stationary ring 620 are installed inside the sealing sleeve 630. The airflow chamber 560 passes through the rotating ring 610 and the stationary ring 620. The moving part is set as the outer wall of the sealing sleeve 630. When the air pressure in the airflow chamber 560 changes, the rotating ring 610 can be driven by the air pressure difference and push against the sealing sleeve 630, so that the outer wall of the sealing sleeve 630 is pressed against the sleeve 550 outside the sealing sleeve 630. When the air pressure in the airflow chamber 560 increases, the high-pressure gas pushes the moving ring 610 axially, pushing the elastic sealing sleeve 630 so that its outer wall expands outward, tightening against the inner wall of the outer sleeve 550 to achieve locking. Simultaneously, the sealing sleeve 630 wraps around the moving ring 610 and the stationary ring 620, forming a complete sealing surface to prevent airflow leakage from the gap between adjacent sleeves 550. The moving ring 610 and the stationary ring 620 provide stable support for the sealing sleeve 630, ensuring uniform deformation and a reasonable distribution of tightening force, avoiding damage to the sealing sleeve 630 caused by localized stress concentration. The sealing sleeve 630 is made of elastic material and has good resilience; when the chamber pressure decreases, it automatically contracts and releases the lock, ensuring smooth extension and retraction of the telescopic tube assembly 500.

[0034] In specific implementations, the rotating ring 610 and stationary ring 620 can be made of engineering plastics, aluminum alloys, stainless steel, etc., while the sealing sleeve 630 can be made of nitrile rubber, silicone rubber, fluororubber, etc. An adhesive layer is provided between the rotating ring 610 and the sealing sleeve 630 to prevent the rotating ring 610 from separating from the sealing sleeve 630 during movement. Multiple annular protrusions are provided on the outer wall of the sealing sleeve 630 to increase the contact area and friction with the inner wall of the sleeve 550, thereby improving the locking force. Multiple tube sections 600 are provided along the axial direction of the sleeve 550 to make the clamping force between adjacent sleeves 550 more uniform and enhance the locking stability. The stationary ring 620 and the rotating ring 610 are in contact via an inclined surface. When the rotating ring 610 moves under the action of a pressure difference, it will generate a radial thrust under the action of the inclined surface, thereby driving the sealing sleeve 630 to deform.

[0035] In some embodiments, reference is made to Figure 5A first anti-slip sleeve 640 is installed on the outer periphery of the stationary ring 620, and a second anti-slip sleeve 590 is provided at the end of each sleeve 550. When one sleeve 550 slides axially relative to the other sleeve 550, the first anti-slip sleeve 640 and the second anti-slip sleeve 590 move closer or further apart relative to each other. When the first anti-slip sleeve 640 and the second anti-slip sleeve 590 move closer together, they can move to a relatively tight fit and be axially fixed. The cooperation between the first anti-slip sleeve 640 and the second anti-slip sleeve 590 realizes the axial limitation of adjacent sleeves 550, preventing the telescopic tube assembly 500 from over-extending and causing the sleeves 550 to separate, thus improving the safety of use. When the adjacent sleeves 550 slide to the maximum extension position, the first anti-slip sleeve 640 and the second anti-slip sleeve 590 press against each other, preventing the sleeves 550 from continuing to slide and avoiding the risk of the sleeves 550 coming off.

[0036] In practical implementation, the first anti-slip sleeve 640 and the second anti-slip sleeve 590 can be made of materials such as rubber, polyurethane, and nylon. Rubber has good elastic cushioning performance, while nylon has high strength and excellent wear resistance. Serrated or grid patterns are set on the opposing surfaces of the anti-slip sleeves to increase friction between them and improve the limiting effect. The anti-slip sleeves are fixed to the sleeve 550 with an interference fit or adhesive to prevent them from falling off during use. Multiple sets of anti-slip sleeves are evenly arranged along the circumference of the sleeve 550 to make the limiting force distribution more uniform and prevent the sleeve 550 from being misaligned under force.

[0037] In some embodiments, reference is made to Figure 3 The outriggers are detachably fitted with ground spikes 750. When used on flat, hard surfaces, the ground spikes 750 can be removed, allowing the foot pads 700 to distribute pressure through their larger contact area, preventing slippage. On soft surfaces such as grass, mud, or sand, the ground spikes 750 can be installed and inserted into the ground, providing strong grip and effectively preventing slippage or tipping. The ground spikes 750 can be installed or removed without additional tools; users can easily do so by simply inserting, pulling, or rotating them. If a ground spike 750 is damaged or lost, it can be replaced individually without replacing the entire foot pad 700, reducing maintenance costs.

[0038] In practical applications, the ground stake 750 can be designed in different structures such as conical, spiral, and multi-claw. Conical ground stake 750 is suitable for general grass and mud, spiral ground stake 750 has stronger grip and is suitable for sandy areas, and multi-claw ground stake 750 is suitable for soft ground such as snow.

[0039] A second aspect of the present invention provides an embodiment of a tripod, including the legs of the above-mentioned photographic support. When the length of the legs needs to be adjusted, the opening and closing mechanism 300 opens the airflow channel 900 and the airflow chamber 560, allowing the airflow chamber 560 to communicate with the outside atmosphere. At this time, the moving part is in a natural state, there is no clamping force between adjacent sleeves 550, and each sleeve 550 can slide axially, changing the total length of the telescopic tube assembly 500. After adjustment, the opening and closing mechanism 300 closes the airflow channel 900 and the airflow chamber 560, forming a closed space. If the legs are subjected to load and have a relative sliding tendency, the volume change of the airflow chamber 560 will cause internal air pressure fluctuations, thereby driving the moving part to move or deform, pressing against the inner wall of the adjacent sleeve 550. When the sliding tendency causes the volume of the airflow chamber 560 to shrink, the internal air pressure increases, and the moving part expands outward to enhance the clamping force; when the sliding tendency causes the volume of the airflow chamber 560 to expand, a negative pressure is formed inside, and the external atmospheric pressure further compresses the moving part, achieving bidirectional self-locking. Therefore, the outrigger does not require the user to adjust each sleeve 550 section by section. The user only needs to control the opening and closing mechanism 300 to lock or unlock the overall telescopic state. This effectively simplifies the adjustment action and greatly improves the adjustment efficiency of the outrigger length.

[0040] 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.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A support leg for a photographic tripod, characterized in that, include: Mounting base (100) and foot pad (700); The telescopic tube assembly (500) includes a plurality of sleeves (550) nested together in sequence. Two adjacent sleeves (550) can slide relative to each other axially, causing the telescopic tube assembly (500) to extend or shorten. The mounting base (100) and the foot pad (700) are connected to the two ends of the telescopic tube assembly (500) in a one-to-one correspondence. When the telescopic tube assembly (500) extends or retracts, it can drive the mounting base (100) and the foot pad (700) to move relative to each other closer or further apart. An airflow chamber (560) is disposed within the telescopic tube assembly (500); when the telescopic tube assembly (500) extends or shortens, the airflow chamber (560) can expand or shrink; the airflow chamber (560) is connected to an airflow channel (900), which is connected to the atmospheric environment; An opening and closing mechanism (300) is provided on the mounting base (100), the telescopic tube assembly (500), or the foot pad (700). The airflow channel (900) is connected to the opening and closing mechanism (300). The opening and closing mechanism (300) can control the airflow channel (900) to communicate with or be relatively disconnected from the airflow chamber (560). When the airflow channel (900) is relatively disconnected from the airflow chamber (560), the airflow chamber (560) is in a closed state. At least one tube segment (600) is provided between each pair of adjacent sleeves (550), the tube segment (600) is provided with a moving part, the airflow chamber (560) is connected to the moving part, the airflow chamber (560) can apply air pressure to the moving part, and cause the moving part to move or deform relative to the airflow chamber (560); when the moving part moves or deforms, it can lock the two adjacent sleeves (550) relative to each other.

2. The support leg of the camera bracket as described in claim 1, characterized in that: The opening and closing mechanism (300) includes a switch (310) movably disposed on the mounting base (100), a seat (530) is provided at the end of the telescopic tube assembly (500), a movable part (400) is provided on the seat (530), and the airflow channel (900) is disposed on the movable part (400); the switch (310) is provided with a guide slope (330), and when the switch (310) moves, it can push the movable part (400) through the guide slope (330), so that the airflow chamber (560) and the airflow channel (900) are connected to each other or relatively isolated; the seat (530) or the switch (310) is provided with a reset part (490), and the reset part (490) is used to drive the airflow channel (900) to move and reset.

3. The support leg of the camera bracket as described in claim 2, characterized in that: The reset part (490) includes a reset spring (495) disposed on the seat (530), the reset spring (495) being connected to the movable member (400); the reset spring (495) is able to drive the movable member (400) to move through its own elasticity, thereby isolating the airflow channel (900) and the airflow chamber (560) from each other.

4. The legs of the camera bracket as described in claim 3, characterized in that: The movable part (400) is equipped with a washer (470). When the reset spring (495) pushes the movable part to move and reset, the movable part (400) can be pressed against the seat (530) through the washer (470).

5. The legs of the camera bracket as described in claim 2, characterized in that: The switch (310) is provided with a ventilation channel (350), which is connected to the airflow channel (900); the mounting base (100) is provided with an air intake channel (110), one end of which is connected to the atmospheric environment, and the other end of which is connected to the ventilation channel (350).

6. The support leg of the photographic bracket as described in claim 1, characterized in that: The telescopic tube assembly (500) is provided with a movable cavity (800) that is connected to the atmospheric environment; the innermost sleeve (550) is provided with a movable part (690) and a pressing part (680). The movable cavity (800) and the airflow chamber (560) are located on both sides of the movable part (690). When a pressure difference is formed between the movable cavity (800) and the airflow chamber (560), the movable part (690) can be pushed by the pressure difference and cause the pressing part (680) to elastically deform. The airflow channel (900) is set as the gap between the two innermost sleeves (550). When the clamping part (680) is elastically deformed, it can press against the inner wall of the sleeve (550) located on its outer side. When the clamping part (680) is elastically deformed, it can close the airflow channel (900).

7. The support leg of the photographic bracket as described in claim 1, characterized in that: The tube section (600) includes a moving ring (610), a stationary ring (620), and an elastic sealing sleeve (630). The stationary ring (620) is installed at the end of the sleeve (550), and the moving ring (610) is movably installed on the stationary ring (620). Both the moving ring (610) and the stationary ring (620) are installed inside the sealing sleeve (630). The airflow chamber (560) passes through the moving ring (610) and the stationary ring (620). The moving part is set as the outer wall of the sealing sleeve (630). When the air pressure in the airflow chamber (560) changes, the moving ring (610) can be driven by the air pressure difference and push against the sealing sleeve (630), so that the outer wall of the sealing sleeve (630) is pressed against the sleeve (550) outside the sealing sleeve (630).

8. The support leg of the photographic bracket as described in claim 7, characterized in that: A first anti-slip sleeve (640) is installed on the outer periphery of the stationary ring (620), and a second anti-slip sleeve (590) is provided at the end of each sleeve (550); when one of the two adjacent sleeves (550) slides axially relative to the other sleeve (550), the first anti-slip sleeve (640) and the second anti-slip sleeve (590) move closer or further apart relative to each other; when the first anti-slip sleeve (640) and the second anti-slip sleeve (590) move closer relative to each other, they can move to be relatively tight and axially fixed.

9. The support leg of the photographic bracket as described in claim 1, characterized in that: The foot pad (700) is detachably fitted with a ground stake (750).

10. A tripod, characterized in that, Includes the legs of the photographic support as described in any one of claims 1 to 9.

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