Tripod center shaft lifting structure

Abstract

The utility model discloses a tripod center shaft lifting structure which comprises a mounting seat, a center hole is formed in the mounting seat, a center shaft capable of lifting is connected in the center hole in a sliding mode, and a locking structure used for locking the center shaft and a gear rack structure used for driving the center shaft to lift are arranged between the mounting seat and the center shaft. The gear and rack structure comprises a rack arranged on the outer surface of the middle shaft in the vertical direction, a rotating shaft transversely and rotationally connected to the mounting base and a gear arranged on the rotating shaft and meshed with the rack, and the rotating shaft is further provided with a hand rocker used for manually driving the rotating shaft to rotate. And a safety structure which is used for limiting the rotation of the rotating shaft and can release the limitation is arranged between the rotating shaft and the mounting seat. The utility model has the advantages of simple structure and high safety.

Description

Technical Field

[0001] The utility model relates to the technical field of tripods, in particular to a central axis lifting structure of a tripod. Background Art

[0002] In the existing photography equipment support technology, the center axis of the tripod plays a vital role. It connects the base of the tripod with the photography equipment on the top, such as a camera or video camera. This center axis design allows users to adjust the height of the equipment according to shooting needs, thereby optimizing the shooting angle and composition. However, the center axis on the current market generally adopts a knob locking mechanism. Although this mechanism is simple and easy to use, it has significant safety hazards and functional defects in actual operation.

[0003] First, the knob locking mechanism requires loosening the knob before adjusting the center column height, which itself increases the risk of the center column slipping off during adjustment. On set, any unexpected equipment slippage can damage expensive photographic equipment and even cause harm to nearby personnel. In addition, this locking method lacks a safety function and cannot provide additional safety protection when the knob is accidentally loosened, which is particularly critical during long-term or complex shooting.

[0004] Secondly, the central axis that is locked by a knob alone is prone to insufficient locking force after long-term use. Over time, the knob may gradually lose its original locking effect due to wear or material fatigue, causing the central axis to loosen without warning, affecting the stability and safety of shooting. The lack of reliability of this locking mechanism limits its application in the field of professional photography, especially in situations that require high stability and safety.

[0005] Therefore, it is necessary to further improve and perfect the prior art to overcome these deficiencies, and the present invention is made based on this situation. Utility Model Content

[0006] The utility model aims to overcome the shortcomings of the prior art and provide a tripod central axis lifting structure with simple structure and high safety.

[0007] The utility model is realized by the following technical solutions:

[0008] In order to solve the above technical problems, the utility model provides a tripod central axis lifting structure, including a mounting seat, a center hole is provided on the mounting seat, a lifting central axis is slidably connected in the center hole, a locking structure for locking the central axis and a gear rack structure for driving the lifting of the central axis are provided between the mounting seat and the central axis, the gear rack structure includes a rack provided on the outer surface of the central axis along the up and down directions, a rotating shaft connected to the mounting seat for transverse rotation, and a gear provided on the rotating shaft and meshing with the rack, the rotating shaft is also provided with a hand crank for manually driving the rotation thereof, and a safety structure for limiting the rotation of the rotating shaft and releasing the limitation is provided between the rotating shaft and the mounting seat.

[0009] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, the safety structure includes a ratchet arranged on a rotating shaft, and a lower pawl rotatably connected to a mounting seat and capable of swinging up and down, and the free end of the lower pawl extends to the lower side of the ratchet and can be engaged with the ratchet when swinging upward, thereby preventing the ratchet from rotating counterclockwise and further preventing the central axis from descending; a first elastic reset member for elastically pressing the lower pawl upward, and an unlocking member for pressing the lower pawl downward are provided between the lower pawl and the mounting seat.

[0010] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, the upper surface of the free end of the lower pawl is provided with a first guide slope surface, and the lower surface of the free end of the lower pawl is provided with a first cliff surface.

[0011] In order to further solve the technical problem to be solved by the utility model, the utility model provides a tripod central axis lifting structure, in which the upper side surface of the lower pawl is provided with a first protrusion, the unlocking piece is located above the first protrusion, the lower side surface of the unlocking piece is provided with at least one first concave surface and at least one first convex surface, and the unlocking piece is slidably connected to the mounting seat along the left and right directions, and when the unlocking piece slides left and right, the first concave surface and the first convex surface can cooperate with the first protrusion in turn to make the lower pawl swing up and down.

[0012] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, the safety structure also includes an upper pawl which is rotatably connected to the mounting seat and can swing up and down, and the free end of the upper pawl extends to the upper side of the ratchet and can be engaged with the ratchet when swinging downward, thereby preventing the ratchet from rotating clockwise and further preventing the central axis from rising; a second elastic reset member is provided between the upper pawl and the mounting seat, which elastically presses the upper pawl downward, and the unlocking member is located below the upper pawl and can press the upper pawl upward.

[0013] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, the lower surface of the free end of the upper ratchet is provided with a second guide slope surface, and the upper surface of the free end of the upper ratchet is provided with a second cliff surface.

[0014] In order to further solve the technical problem to be solved by the utility model, the utility model provides a tripod central axis lifting structure, in which the lower side surface of the upper pawl is provided with a second protrusion, the unlocking piece is located below the second protrusion, the upper side surface of the unlocking piece is provided with at least one second concave surface and at least one second convex surface, and the unlocking piece is slidably connected to the mounting seat along the left and right directions, and when the unlocking piece slides left and right, the second concave surface and the second convex surface can cooperate with the second protrusion in turn to make the upper pawl swing up and down.

[0015] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, the gear also serves as the ratchet.

[0016] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, a sliding groove for an unlocking member to slide left and right is provided on the mounting seat, and a sliding button is provided on the unlocking member.

[0017] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, a bearing for rotatably connecting the rotating shaft and the mounting seat is provided between the rotating shaft and the mounting seat.

[0018] In order to further solve the technical problem to be solved by the utility model, the utility model provides a tripod central axis lifting structure, in which the locking structure includes a threaded hole provided on the mounting seat and penetrating into the center hole, and a locking knob that cooperates with the threaded hole and can tighten the central axis inward and loosen the central axis outward.

[0019] In order to further solve the technical problem to be solved by the utility model, in a tripod central axis lifting structure provided by the utility model, at least three supporting legs are rotatably connected to the mounting seat.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] 1. The utility model realizes the lifting and lowering of the central axis through the meshing action of the gear and the rack. In addition to the locking knob, a safety structure is also provided between the rotating shaft and the mounting seat. This safety structure can limit the rotation of the rotating shaft when necessary, thereby preventing the central axis from accidentally moving when not needed, providing additional safety protection.

[0022] 2. The safety structure of the utility model mainly includes a ratchet, a lower pawl, an upper pawl, a first elastic reset member, a second elastic reset member and an unlocking member, which can realize precise control and safety protection of the lifting and lowering movement of the tripod center axis. The main function of the lower pawl is to limit the descent of the center axis, while the main function of the upper pawl is to limit the rise of the center axis. When the height of the center axis needs to be adjusted, the user can overcome the elastic force of the first elastic reset member and the second elastic reset member by operating the unlocking member, so that the upper pawl and the lower pawl swing up and down, thereby disengaging or getting stuck in the ratchet, thereby limiting or allowing the center axis to move up and down. This design not only simplifies the operation, but also improves the reliability of locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0025] Figure 2 It is an exploded schematic diagram of the utility model;

[0026] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0027] Figure 4 is a schematic cross-sectional view of a lower pawl and an upper pawl;

[0028] Figure 5 It is a cross-sectional schematic diagram of the unlocking member. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figures 1 to 5 The central axis lifting structure of a tripod is shown, which is designed to provide a more stable, safe and convenient operation experience. The structure mainly includes a mounting base 1, a central axis 2, a locking structure 3, a gear rack structure 4 and a safety structure 5.

[0031] Typically, at least three legs 6 are rotatably connected to the mounting base 1. A central hole 11 is provided on the mounting base 1, and the central hole 11 allows the central axis 2 to move up and down therein. That is, the central axis 2 can slide freely in the central hole 11 to meet the shooting requirements at different heights.

[0032] A locking structure 3 for locking the central axis 2 is provided between the mounting seat 1 and the central axis 2. The locking structure 3 includes a threaded hole 13 provided on the mounting seat 1, and a locking knob 31 matched with the threaded hole 13. The locking knob 31 is threadedly connected to the threaded hole 13, and can be pressed inwardly against the central axis 2 to fix its position, or loosened outwardly to allow the central axis 2 to be raised or lowered.

[0033] A gear rack structure 4 is also provided between the mounting seat 1 and the central axis 2 for driving the central axis 2 to rise and fall. The gear rack structure 4 is the core mechanism for achieving the lifting and falling of the central axis 2. It includes a rack 21 provided along the outer surface of the central axis 2, a rotating shaft 41 connected to the mounting seat 1 for transverse rotation, and a gear 42 installed on the rotating shaft 41 and meshing with the rack 21. A hand crank 43 is also provided on the rotating shaft 41, and the user can drive the rotating shaft 41 by manually rotating the hand crank 43, thereby achieving the lifting and falling of the central axis 2 through the meshing action of the gear 42 and the rack 21.

[0034] More importantly, a safety structure 5 is provided between the rotating shaft 41 and the mounting base 1. The safety structure 5 can limit the rotation of the rotating shaft 41 when necessary, thereby preventing the central axis 2 from accidentally moving when not needed, providing additional safety protection. When the height of the central axis 2 needs to be adjusted, the user can remove the restriction of the safety structure 5 and perform normal lifting operations.

[0035] like Figure 2-Figure 5 As shown, the safety structure 5 mainly includes a ratchet 51, a lower pawl 52, an upper pawl 55, a first elastic reset member 53, a second elastic reset member 56 and an unlocking member 54, which can achieve precise control and safety protection of the lifting and lowering movement of the tripod center axis 2. The main function of the lower pawl 52 is to limit the descent of the center axis 2, while the main function of the upper pawl 55 is to limit the rise of the center axis 2. The details are as follows:

[0036] Structure for limiting the descent of the center axis 2: The safety structure 5 includes a ratchet 51 provided on the rotating shaft 41, and a lower ratchet 52 provided on the mounting seat 1. The main function of the lower ratchet 52 is to limit the descent of the center axis 2. Specifically, the lower ratchet 52 is connected to the mounting seat 1 by rotation, and its free end is designed to be able to extend to the lower side of the ratchet 51. When it is necessary to limit the descent of the center axis 2, the lower ratchet 52 swings upward, and its free end is stuck in the teeth of the ratchet 51, thereby preventing the ratchet 51 from rotating counterclockwise. This action effectively prevents the descent of the center axis 2 and ensures the stability and safety of the photographic equipment.

[0037] In order to ensure that the lower pawl 52 can automatically reset when not needed, a first elastic reset member 53 is provided between the mounting seat 1 and the lower pawl 52. The first elastic reset member 53 is preferably a compression spring. Such an elastic reset member elastically presses the lower pawl 52 upward to keep it in a working state, that is, in a state of contact with the ratchet 51. In this way, when the height of the middle shaft 2 needs to be adjusted, the user can overcome the elastic force of the first elastic reset member 53 by operating the unlocking member 54, so that the lower pawl 52 moves downward and disengages from the ratchet 51, thereby allowing the middle shaft 2 to descend.

[0038] The unlocking member 54 is another key component, which is located below the lower pawl 52 and is used to press the lower pawl 52 downward when necessary to disengage the ratchet 51, thereby allowing the middle shaft 2 to drop. This design not only simplifies the operation, but also improves the reliability of locking.

[0039] Through the safety structure 5, the utility model provides an efficient, stable and safe tripod center axis lifting control mechanism, which is very suitable for professional photography and videography.

[0040] Furthermore, the upper surface of the free end of the lower pawl 52 is provided with a first guide slope 521, and the lower surface of the free end of the lower pawl 52 is provided with a first cliff surface 522. When the ratchet 51 rotates counterclockwise, its teeth will contact the first cliff surface 522 on the lower surface of the free end of the lower pawl 52. The design of this cliff surface prevents the teeth of the ratchet 51 from moving forward, thereby effectively blocking the ratchet 51 and preventing it from rotating counterclockwise, thereby preventing the central axis 2 from falling. This mechanism ensures that the central axis 2 can stably remain in the current position when the height does not need to be adjusted, thereby enhancing the stability during photography. On the contrary, if the ratchet 51 rotates clockwise, its teeth will contact the first guide slope 521 on the upper surface of the free end of the lower pawl 52. The design of this guide slope can guide the teeth of the ratchet 51 to slide smoothly over the lower pawl 52 without being stuck, thereby allowing the ratchet 51 to rotate clockwise, that is, allowing the central axis 2 to rise. This mechanism ensures that when there is no need to adjust the height, the center axis 2 can stably remain in the current position (cannot drop but its rise is not hindered), thereby enhancing stability during photography.

[0041] Furthermore, the upper side of the lower pawl 52 is provided with a first protrusion 523, the unlocking member 54 is located above the first protrusion 523, and the lower side of the unlocking member 54 is provided with at least one first concave surface 541 and at least one first convex surface 542. An inclined surface transition is adopted between adjacent first concave surfaces 541 and first convex surfaces 542, and this design allows the unlocking member 54 to smoothly cooperate with the first protrusion 523 when sliding.

[0042] The unlocking member 54 is slidably connected to the mounting base 1 in the left-right direction, and this sliding connection is achieved through a slide groove 12 provided on the mounting base 1. The slide groove 12 allows the unlocking member 54 to slide left-right inside the slide groove 12, and the slide button 57 on the unlocking member 54 provides convenience for the user to operate, and the user can control the sliding of the unlocking member 54 by pushing the slide button 57.

[0043] When the unlocking member 54 slides left and right, the first concave surface 541 and the first convex surface 542 on it will cooperate with the first protrusion 523 in turn. This cooperation mechanism allows the lower pawl 52 to swing up and down. Specifically, when the first convex surface 542 contacts the first protrusion 523, the lower pawl 52 will be pushed downward, thereby disengaging from the ratchet 51, allowing the middle shaft 2 to descend. When the first concave surface 541 contacts the first protrusion 523, the lower pawl 52 will be pushed upward and stuck in the ratchet 51, preventing the middle shaft 2 from descending. This design not only improves the convenience of operation, but also enhances the stability and reliability of the entire system.

[0044] The structure that limits the rise of the middle axis 2: Figures 2 to 5 As shown, the safety structure 5 of the present invention not only includes a mechanism for limiting the descent of the middle axis 2 , but also is designed with a structure for limiting the rise of the middle axis 2 , which is achieved through the coordinated action of the upper pawl 55 , the second elastic reset member 56 and the unlocking member 54 .

[0045] The upper pawl 55 is connected to the mounting base 1 by rotation, and its free end is designed to extend to the upper side of the ratchet 51. When the middle shaft 2 needs to be restricted from rising, the upper pawl 55 swings downward, and its free end is engaged in the teeth of the ratchet 51, thereby preventing the ratchet 51 from rotating clockwise. This action effectively prevents the middle shaft 2 from rising, ensuring the stability and safety of the photographic equipment.

[0046] In order to ensure that the upper pawl 55 can be automatically reset, a second elastic reset member 56 is provided between the mounting seat 1 and the upper pawl 55. The second elastic reset member 56 is preferably a compression spring. Such an elastic reset member elastically presses the upper pawl 55 downward to keep it in a working state, that is, in a state of contact with the ratchet 51. In this way, when the height of the middle shaft 2 needs to be adjusted, the user can overcome the elastic force of the second elastic reset member 56 by operating the unlocking member 54, so that the upper pawl 55 moves upward and disengages from the ratchet 51, thereby allowing the middle shaft 2 to rise.

[0047] The unlocking member 54 is located below the upper pawl 55 and is used to press the upper pawl 55 upward when necessary to disengage the ratchet 51, thereby allowing the middle shaft 2 to rise. This design not only simplifies the operation, but also improves the reliability of locking.

[0048] This two-way control mechanism ensures that the center axis 2 can be stably maintained in the desired position in any situation, enhancing stability during photography and ease of operation.

[0049] More specifically, the lower surface of the free end of the upper pawl 55 is provided with a second guide slope 551, and the upper surface of the free end of the upper pawl 55 is provided with a second cliff surface 552. As described above, when the ratchet 51 rotates counterclockwise, its teeth will contact the second guide slope 551 on the lower surface of the free end of the upper pawl 55. The design of this guide slope allows the teeth of the ratchet 51 to slide smoothly over the upper pawl 55 without being stuck, thereby allowing the ratchet 51 to rotate counterclockwise, that is, allowing the middle shaft 2 to descend. On the contrary, if the ratchet 51 rotates clockwise, its teeth will contact the second cliff surface 552 on the upper surface of the free end of the upper pawl 55. The design of this cliff surface prevents the teeth of the ratchet 51 from moving forward, thereby effectively blocking the ratchet 51 and preventing it from rotating clockwise, that is, limiting and preventing the middle shaft 2 from rising. This mechanism ensures that when the height does not need to be adjusted, the middle shaft 2 can stably remain in the current position (cannot rise but does not hinder its descent), thereby enhancing stability during photography.

[0050] More specifically, the lower side of the upper pawl 55 is provided with a second protrusion 553, and this design enables the unlocking member 54 to control the upper pawl 55 to swing up and down by interacting with the second protrusion 553. The unlocking member 54 is located below the second protrusion 553, and the upper side of the unlocking member 54 is provided with at least one second concave surface 543 and at least one second convex surface 544. The adjacent second concave surface 543 and the second convex surface 544 are transitioned by an inclined surface, and this design allows the unlocking member 54 to smoothly cooperate with the second protrusion 553 when sliding.

[0051] When the unlocking member 54 slides left and right, the second concave surface 543 and the second convex surface 544 on it will cooperate with the second protrusion 553 in turn, and this cooperation mechanism allows the upper pawl 55 to swing up and down. Specifically, when the second convex surface 544 contacts the second protrusion 553, the upper pawl 55 will be pushed upward, thereby disengaging from the ratchet 51, allowing the middle shaft 2 to rise. When the second concave surface 543 contacts the second protrusion 553, the upper pawl 55 will be pushed downward, stuck in the ratchet 51, and prevent the middle shaft 2 from rising.

[0052] like Figures 2 to 5 As shown, the safety structure 5 of the utility model further optimizes the functional integration of the gear 42 and the ratchet 51 in design. By making the gear 42 also serve as the ratchet 51, that is, the two are the same part, the parts are shared, thereby simplifying the structure and improving the compactness and efficiency of the system. This design not only reduces the number of parts and reduces the manufacturing cost, but also makes the entire tripod structure more compact and easy to carry and use. At the same time, due to the integration of the gear 42 and the ratchet 51, the stability and reliability of the system are also improved, ensuring that stable support can be provided in various photographic environments.

[0053] like Figure 5 As shown, in the C region, the second convex surface 544 is located directly above the first concave surface 541 , in the B region, the second concave surface 543 is located directly above the first convex surface 542 , and in the A region, another second convex surface 544 is located directly above the first convex surface 542 .

[0054] During the sliding of the unlocking member 54, when the C region is aligned with the first protrusion 523 of the lower pawl 52 and the second protrusion 553 of the upper pawl 55, the lower pawl 52 can swing upward under the action of the first elastic return member 53 to clamp the ratchet 51, while the upper pawl 55 is restricted by the unlocking member 54 and cannot swing downward to clamp the ratchet 51, that is, the middle shaft 2 can be prevented from descending;

[0055] On the contrary, when the B region is aligned with the first protrusion 523 of the lower pawl 52 and the second protrusion 553 of the upper pawl 55, the upper pawl 55 can swing downward under the action of the second elastic return member 56 to clamp the ratchet 51, while the lower pawl 52 is restricted by the unlocking member 54 and cannot swing upward to clamp the ratchet 51, that is, the middle shaft 2 can be prevented from rising;

[0056] When area A is aligned with the first protrusion 523 of the lower pawl 52 and the second protrusion 553 of the upper pawl 55, the lower pawl 52 and the upper pawl 55 are both pushed open by the unlocking member 54 and cannot contact the ratchet 51. Therefore, the safety is completely released at this time, and the middle shaft 2 can be raised and lowered freely.

[0057] More specifically, a bearing 44 is provided between the rotating shaft 41 and the mounting seat 1 to rotatably connect the two. By introducing the bearing 44, a smooth rotation connection between the rotating shaft 41 and the mounting seat 1 is achieved. This design allows the rotating shaft 41 to rotate freely in the mounting seat 1 while maintaining the stability of the structure and reducing friction.

Claims

1. A tripod central axis lifting structure, characterized in that: The invention comprises a mounting seat (1), wherein the mounting seat (1) is provided with a center hole (11), wherein a lifting middle shaft (2) is slidably connected in the center hole (11), wherein a locking structure (3) for locking the middle shaft (2) and a gear rack structure (4) for driving the middle shaft (2) to be lifted are provided between the mounting seat (1) and the middle shaft (2), wherein the gear rack structure (4) comprises a gear rack (21) provided on the outer surface of the middle shaft (2) in the up-down direction, a rotating shaft (41) connected to the mounting seat (1) in a transverse rotation, and a gear (42) provided on the rotating shaft (41) and meshing with the gear rack (21), wherein the rotating shaft (41) is also provided with a hand crank (43) for manually driving the rotating shaft (41) to rotate, and a safety structure (5) for limiting the rotation of the rotating shaft (41) and releasing the limitation is provided between the rotating shaft (41) and the mounting seat (1).

2. The tripod central axis lifting structure according to claim 1, characterized in that: The safety structure (5) comprises a ratchet (51) arranged on the rotating shaft (41), and a lower ratchet (52) rotatably connected to the mounting seat (1) and capable of swinging up and down, and the free end of the lower ratchet (52) extends to the lower side of the ratchet (51) and can be engaged with the ratchet (51) when swinging upward, thereby preventing the ratchet (51) from rotating counterclockwise, thereby preventing the middle shaft (2) from descending; a first elastic reset member (53) for elastically pressing the lower ratchet (52) upward, and an unlocking member (54) for pressing the lower ratchet (52) downward are provided between the lower ratchet (52) and the mounting seat (1).

3. The tripod central axis lifting structure according to claim 2, characterized in that: The upper surface of the free end of the lower pawl (52) is provided with a first guide slope surface (521), and the lower surface of the free end of the lower pawl (52) is provided with a first cliff surface (522).

4. The tripod central axis lifting structure according to claim 2, characterized in that: The upper side surface of the lower pawl (52) is provided with a first protruding portion (523), the unlocking member (54) is located above the first protruding portion (523), the lower side surface of the unlocking member (54) is provided with at least one first concave surface (541) and at least one first convex surface (542), and the unlocking member (54) is slidably connected to the mounting seat (1) along the left-right direction, and when the unlocking member (54) slides left-right, the first concave surface (541) and the first convex surface (542) can be alternately matched with the first protruding portion (523) to make the lower pawl (52) swing up and down.

5. The tripod central axis lifting structure according to claim 2, characterized in that: The safety structure (5) further comprises an upper pawl (55) which is rotatably connected to the mounting seat (1) and can swing up and down, and the free end of the upper pawl (55) extends to the upper side of the ratchet (51) and can be engaged with the ratchet (51) when swinging downward, thereby preventing the ratchet (51) from rotating clockwise, thereby preventing the middle shaft (2) from rising; a second elastic reset member (56) is provided between the upper pawl (55) and the mounting seat (1) for elastically pressing the upper pawl (55) downward, and the unlocking member (54) is located below the upper pawl (55) and can press the upper pawl (55) upward.

6. The tripod central axis lifting structure according to claim 5, characterized in that: The lower surface of the free end of the upper pawl (55) is provided with a second guide slope surface (551), and the upper surface of the free end of the upper pawl (55) is provided with a second cliff surface (552).

7. The tripod central axis lifting structure according to claim 5, characterized in that: The lower side surface of the upper pawl (55) is provided with a second protruding portion (553), the unlocking member (54) is located below the second protruding portion (553), the upper side surface of the unlocking member (54) is provided with at least one second concave surface (543) and at least one second convex surface (544), and the unlocking member (54) is connected to the mounting seat (1) in a sliding manner along the left and right directions, and when the unlocking member (54) slides left and right, the second concave surface (543) and the second convex surface (544) can be alternately matched with the second protruding portion (553) to make the upper pawl (55) swing up and down.

8. The tripod central axis lifting structure according to claim 2 or 5, characterized in that: The gear (42) also serves as the ratchet (51).

9. The tripod central axis lifting structure according to claim 2 or 5, characterized in that: The mounting seat (1) is provided with a slide groove (12) for the unlocking member (54) to slide left and right therein, and the unlocking member (54) is provided with a slide button (57).

10. The tripod central axis lifting structure according to claim 1, characterized in that: A bearing (44) is provided between the rotating shaft (41) and the mounting seat (1) for rotatably connecting the two.

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