Foot tube locking structure, supporting leg and supporting frame

Abstract

The utility model discloses a foot tube locking structure, a supporting foot and a supporting frame, and the foot tube locking structure comprises a first movable seat, a worm, a worm gear, a transmission assembly, a first pressing block and a second pressing block, and further comprises a transmission shaft, and a first fixed tube and a second fixed tube which are respectively arranged on two sides of the transmission shaft, the first movable seat is positioned between the first fixed pipe and the second fixed pipe and is movably arranged on the transmission shaft; the worm rotates synchronously with the transmission shaft, is connected with the motor and is used for axially moving relative to the transmission shaft under the driving of the motor; the worm gear is arranged on the first movable seat and is meshed with the worm; the first pressing block and the second pressing block are arranged on the two sides of the worm correspondingly. The input end of the transmission assembly is connected with the worm gear, the first output end is connected with the first pressing block, and the second output end is connected with the second pressing block. By means of the structure, the foot tube locking structure can be applied to the calandria type supporting frame, the unlocking and locking requirements of the calandria type supporting frame are met, and the good practicability is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photographic equipment field especially a foot pipe locking structure, support foot and support frame. BACKGROUND

[0002] Mobile phone and camera (or tablet computer, notebook computer etc.) are the equipment that people usually use in daily life and work, in order to conveniently satisfy some user's use demand to the aspect of shooting, will use support frame to support shooting equipment when shooting, convenient for liberating user's both hands, in the existing support frame, its multistage foot pipe is the form of single pipe, three foot pipes are sequentially connected, and in the support frame of electric control unlocking, motor drives transmission shaft rotation, and then locks every stage foot pipe through locking structure, but this structure cannot be applied to the row pipe type ground support frame, therefore, the foot pipe locking structure, support foot and support frame that urgently needed solve the above problems. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art is solved, for this, the utility model provides a foot pipe locking structure and support frame.

[0004] The utility model provides a foot pipe locking structure, including first movable seat, worm, worm wheel, transmission assembly, first pressure block and second pressure block, still including transmission shaft and the first fixed pipe and the second fixed pipe that divide in transmission shaft both sides,

[0005] First movable seat is located between first fixed pipe and second fixed pipe and is movably arranged on transmission shaft, to relative transmission shaft axial motion,

[0006] Worm rotates with transmission shaft synchronously and is connected with motor, for relative transmission shaft axial motion under the drive of motor,

[0007] Worm wheel is arranged on first movable seat and is engaged with worm,

[0008] First pressure block and second pressure block divide in worm both sides,

[0009] The input of transmission assembly is connected with worm wheel, first output is connected with first pressure block and second output is connected with second pressure block,

[0010] Worm can drive first pressure block and second pressure block to move away from each other through worm wheel and transmission assembly when transmission shaft rotates forward, to make first pressure block abut against first fixed pipe, second pressure block abut against second fixed pipe, or worm can drive first pressure block and second pressure block to move to each other through worm wheel and transmission assembly when transmission shaft rotates forward, to make first pressure block separate from first fixed pipe, second pressure block separate from second fixed pipe.

[0011] As one of the preferred embodiments of the utility model, the transmission assembly comprises a connecting rod, a first gear, a second gear, a third gear and a fourth gear.

[0012] The connecting rod is rotatably arranged on the first movable seat, and the worm gear is arranged on the connecting rod.

[0013] The first gear and the second gear are arranged on the connecting rod and are arranged on the two sides of the worm gear.

[0014] The third gear is connected with the first pressing block and is engaged with the first gear.

[0015] The fourth gear is connected with the second pressing block and is engaged with the second gear.

[0016] As one of the preferred embodiments of the utility model, a switching switch and a clutch assembly are arranged on the first movable seat.

[0017] The switching switch is axially movably arranged on the connecting rod and has a first state and a second state, and the first gear and the second gear are arranged on the switching switch.

[0018] The clutch assembly is connected between the worm gear and the switching switch and has an engagement position and a movable position.

[0019] The switching switch can be synchronously rotated with the worm gear when the clutch assembly is in the engagement position, or the switching switch can be switched between the first state and the second state when the clutch assembly is in the movable position, and the first pressing block and the second pressing block are driven to move away from each other when the switching switch is switched from the first state to the second state, and the first pressing block and the second pressing block are driven to move towards each other when the switching switch is switched from the second state to the first state.

[0020] As one of the preferred embodiments of the utility model, the clutch assembly comprises a clutch protrusion arranged on the worm gear and a clutch groove arranged on the switching switch, and the clutch protrusion is inserted into the clutch groove when the clutch protrusion is in the engagement position, and the clutch protrusion is separated from the clutch groove when the clutch protrusion is in the movable position.

[0021] As one of the preferred embodiments of the utility model, the foot pipe locking structure further comprises a reset spring sleeved on the connecting rod and abutting against the worm gear and the switching switch.

[0022] As one of the preferred embodiments of the utility model, a battery assembly electrically connected with the motor is arranged in the first fixed pipe and / or the second fixed pipe.

[0023] A supporting foot comprising the foot pipe locking structure.

[0024] A supporting frame comprising the supporting foot.

[0025] The utility model discloses a beneficial effect: a foot tube locking structure, support foot and support frame, foot tube locking structure includes first movable seat, worm, worm wheel, transmission assembly, first briquetting and second briquetting, still includes transmission shaft and the first fixed pipe and the second fixed pipe of being arranged in the first fixed pipe and the second fixed pipe two sides of transmission shaft, first movable seat is located between the first fixed pipe and the second fixed pipe and is set up on transmission shaft, worm and transmission shaft synchronous rotation and with motor connection, for under the drive of motor relative transmission shaft axial movement, worm wheel sets up on first movable seat and is engaged with worm, first briquetting and second briquetting are arranged in the two sides of worm, the input of transmission assembly is connected with worm wheel, first output and first briquetting are connected and second output and second briquetting are connected, through above -mentioned structure makes foot tube locking structure can be applied to the row pipe type support frame, satisfies the row pipe type support frame's solution lock demand, has very good practicality. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0027] Figure 1 It is a kind of support frame in the structure schematic diagram of folding state;

[0028] Figure 2 It is a kind of support frame in the structure schematic diagram of unfolding state;

[0029] Figure 3 It is the exploded view of a kind of support foot;

[0030] Figure 4 It is Figure 3 Local enlarged view of area A in it;

[0031] Figure 5 It is the cross-sectional view of a kind of support frame in folding state;

[0032] Figure 6 It is Figure 5 Local enlarged view of area B in it;

[0033] Figure 7 It is Figure 5 Local enlarged view of area C in it. DETAILED DESCRIPTION

[0034] This part will describe the specific embodiment of the utility model in detail, and the preferred embodiment of the utility model is shown in the drawings, and the effect of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0035] In the description of the utility model, the meaning of multiple is two or more, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second are described, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0036] In the description of the utility model, it is understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like based on the orientation or position relationship shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0037] In the utility model, unless otherwise explicitly limited, the words such as '' set up '', '' install '', '' connect '' should be broadly understood, for example, can be directly connected, can also be indirectly connected through intermediate medium, can be fixedly connected, can also be detachably connected, can also be integrally formed, can be mechanically connected, can be the communication or interaction relationship between two elements inside two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0038] 1) Refer to Figures 1-2And 5, in the utility model, with three support legs rotatably connected to the three support legs as an example to illustrate, wherein each support leg comprises a first mounting seat 110, a second mounting seat 120, a fixed pipe group 200, a first telescopic pipe group 300, a second telescopic pipe group 400, a transmission shaft 510, a motor 520, a first locking assembly 600, a second locking assembly 700 and a linkage assembly 800; the first mounting seat 110 and the second mounting seat 120 are oppositely arranged; the fixed pipe group 200 is connected between the first mounting seat 110 and the second mounting seat 120; the first telescopic pipe group 300 is movably arranged on the fixed pipe group 200 to axially move relative to the fixed pipe group 200; the second telescopic pipe group 400 is movably arranged on the first telescopic pipe group 300 to axially move relative to the first telescopic pipe group 300; the transmission shaft 510 is rotatably connected between the first mounting seat 110 and the second mounting seat 120; the first motor 520 is connected with one end of the transmission shaft 510; the first locking assembly 600 is connected between the fixed pipe group 200, the first telescopic pipe group 300 and the transmission shaft 510 and has a locking position and an unlocking position; the second locking assembly 700 is connected between the first telescopic pipe group 300 and the second telescopic pipe group 400 and has a locking position and an unlocking position; the linkage assembly 800 is connected with the first locking assembly 600 and the second locking assembly 700 respectively, for linkage of the first locking assembly 600 and the second locking assembly 700 to simultaneously enter the locking position or the unlocking position.

[0039] Specifically, when the support leg needs to be unfolded, power is input through the motor 520, when the motor 520 reversely rotates, the first locking assembly 600 is driven to enter the unlocking position, and the second locking assembly 700 is linked with the first locking assembly 600 through the linkage assembly 800, so that the second locking assembly 700 also enters the unlocking position, so that the first telescopic pipe group 300 can move relative to the fixed pipe group 200 and the second telescopic pipe group 400 can move relative to the first telescopic pipe group 300, so that the support leg can be unfolded or folded; when the support leg is unfolded or folded, the motor 520 is reversely rotated, the first locking assembly 600 is driven to enter the locking position through the transmission shaft 510, and the second locking assembly 700 also enters the locking position under the action of the linkage assembly 800, so as to respectively limit the movement between the first telescopic pipe group 300 and the fixed pipe group 200 and the movement between the second telescopic pipe group 400 and the first telescopic pipe group 300, so as to keep the support frame in the unfolded state or the folded state.

[0040] 2) with reference to Figures 3-4In some embodiments, the fixed pipe group 200 comprises a first fixed pipe 210 and a second fixed pipe 220 arranged on both sides of the transmission shaft 510, the first locking assembly 600 comprises a first movable seat 610, a worm 620, a worm wheel 630, a transmission assembly 640, a first pressing block 650 and a second pressing block 660; the first movable seat 610 is located between the first fixed pipe 210 and the second fixed pipe 220 and is movably arranged on the transmission shaft 510 to move axially relative to the transmission shaft 510; the worm 620 rotates synchronously with the transmission shaft 510 and can move axially relative to the transmission shaft 510; the worm wheel 630 is arranged on the first movable seat 610 and is engaged with the worm 620; the first pressing block 650 and the second pressing block 660 are arranged on both sides of the worm 620; the input end of the transmission assembly 640 is connected with the worm wheel 630, the first output end is connected with the first pressing block 650, and the second output end is connected with the second pressing block 660.

[0041] Specifically, when the motor 520 drives the transmission shaft 510 to rotate forward, the worm 620 will rotate synchronously, and the worm 620 is connected with the transmission shaft 510 through the axially arranged guide structure, so that the worm 620 can rotate synchronously with the transmission shaft 510 and can move axially relative to the transmission shaft 510; further, when the worm 620 rotates, the worm wheel 630 will be driven to rotate, and then the first pressing block 650 and the second pressing block 660 are driven to move away from each other through the transmission assembly 640; it should be noted that the first pressing block 650 and the second pressing block 660 are connected with the transmission assembly 640 through threads, and the first pressing block 650 and the second pressing block 660 are connected with the first movable seat 610 through horizontal guide structure, which can convert the rotary motion of the first pressing block 650 and the second pressing block 660 into linear motion in the horizontal direction, so that the first pressing block 650 abuts against the first fixed pipe 210 and the second pressing block 660 abuts against the second fixed pipe 220, thereby realizing the restriction of the relative motion between the first movable seat 610 (the first telescopic pipe group 300) and the fixed pipe group 200; when the motor 520 drives the transmission shaft 510 to rotate reversely, the first pressing block 650 and the second pressing block 660 will be driven to move towards each other through the worm 620, the worm wheel 630 and the transmission assembly 640, so that the first pressing block 650 is separated from the first fixed pipe 210 and the second pressing block 660 is separated from the second fixed pipe 220, and at this time the first movable seat 610 (the first telescopic pipe group 300) can move relative to the fixed pipe group 200.

[0042] 3) with reference to Figures 3-4In some embodiments, the transmission assembly 640 comprises a connecting rod 641, a first gear 642, a second gear 643, a third gear 644 and a fourth gear 645; the connecting rod 641 is rotationally arranged on the first movable seat 610, and the worm gear 630 is arranged on the connecting rod 641; the first gear 642 and the second gear 643 are arranged on the connecting rod 641 and are arranged on the two sides of the worm gear 630; the third gear 644 is connected with the first pressing block 650 and is engaged with the first gear 642; and the fourth gear 645 is connected with the second pressing block 660 and is engaged with the second gear 643.

[0043] Specifically, when the worm gear 630 rotates, the first gear 642 and the second gear 643 will be driven to rotate at the same time, the first gear 642 drives the third gear 644 to rotate, and the second gear 643 drives the fourth gear 645 to rotate, so as to finally realize the opposite movement or the opposite movement between the first pressing block 650 and the second pressing block 660.

[0044] 4) Refer to Figures 1-6 In some embodiments, the first movable seat 610 is provided with a switching switch 670 and a clutch assembly 680; the switching switch 670 is axially movably arranged on the connecting rod 641 and has a first state and a second state, the first gear 642 and the second gear 643 are arranged on the switching switch 670; and the clutch assembly 680 is connected between the worm gear 630 and the switching switch 670 and has an engagement position and a movable position.

[0045] Specifically, the switching switch 670 is used as a backup of the electric drive type unlocking and locking, and is a manual type unlocking and locking, which can manually unlock and lock the supporting foot when the electric drive type unlocking and locking fails; further, the switching switch 670 is arranged as a buckle, in the electric drive type unlocking and locking mode, the clutch assembly 680 is in the engagement position, that is, the switching switch 670 is linked with the worm gear 630, so that the motor 520 drives the switching switch 670 to switch between the first state and the second state through the transmission shaft 510, the worm 620 and the worm gear 630, that is, when the electric drive type unlocking and locking, the switching switch 670 will also act; when the electric drive type unlocking and locking fails, the switching switch 670 can be axially slid to make the clutch assembly 680 enter the movable position, at this time, the switching switch 670 can be switched between the first state and the second state in the form of manual operation, that is, when the switching switch 670 is switched from the first state to the second state, the first pressing block 650 and the second pressing block 660 are driven to move away from each other, and when the switching switch 670 is switched from the second state to the first state, the first pressing block 650 and the second pressing block 660 are driven to move towards each other.

[0046] 5) Refer to Figures 3-4In some embodiments, the clutch assembly 680 comprises a clutch protrusion 681 arranged on the worm wheel 630 and a clutch groove 682 arranged on the switch 670, the clutch protrusion 681 is in the engaged position when inserted into the clutch groove 682, and the clutch protrusion 681 is in the active position when separated from the clutch groove 682.

[0047] 6) Refer to Figures 3-4 In some embodiments, the foot pipe locking structure further comprises a reset spring 690 sleeved on the connecting rod 641 and abutting against the worm wheel 630 and the switch 670 respectively; by arranging the reset spring 690, the clutch assembly 680 can be kept in the engaged position in the electric drive unlocking mode, and only when the switch 670 is pulled and the frictional force and the elastic force of the reset spring 690 are overcome, the clutch assembly 680 enters the active position.

[0048] 7) Refer to Figure 5 and Figure 7 In some embodiments, the first telescopic pipe group 300 comprises a first foot pipe 310 and a second foot pipe 320 arranged on both sides of the transmission shaft 510, the second telescopic pipe group 400 comprises a third foot pipe 410 inserted into the first foot pipe 310 and a fourth foot pipe 420 inserted into the second foot pipe 320, and the second locking assembly 700 comprises a second movable seat 710, a first limiting sleeve 720 and a second limiting sleeve 730; the second movable seat 710 is arranged at the end of the first telescopic pipe group 300; the first limiting sleeve 720 is arranged on the second movable seat 710, the third foot pipe 410 is inserted into the first limiting sleeve 720, the second limiting sleeve 730 is arranged on the second movable seat 710, and the fourth foot pipe 420 is inserted into the second limiting sleeve 730; the linkage assembly 800 is connected with the first limiting sleeve 720 and the second limiting sleeve 730.

[0049] Specifically, when the motor 520 drives the transmission shaft 510 to rotate forward, the first locking assembly 600 will be driven to the locking position, and the first limiting sleeve 720 and the second limiting sleeve 730 will be driven to move upward by the linkage assembly 800, so that the first limiting sleeve 720 and the second limiting sleeve 730 abut against the second movable seat 710. The first limiting sleeve 720 and the second limiting sleeve 730 are composed of a plurality of clamping pieces, the outer wall of the clamping pieces is provided with a first inclined surface, the inner wall of the second movable seat 710 is provided with a first wedge block 910 and a second wedge block 920, the first wedge block 910 and the second wedge block 920 are provided with a second inclined surface abutting against the first inclined surface, and the clamping pieces are deformed by the cooperation between the first inclined surface and the second inclined surface, so as to tightly clamp the third leg pipe 410 and the fourth leg pipe 420, respectively; or when the motor 520 drives the transmission shaft 510 to rotate reversely, the first locking assembly 600 will be driven to the unlocking position, and the first limiting sleeve 720 and the second limiting sleeve 730 will be driven to move downward by the linkage assembly 800, so that the first limiting sleeve 720 and the second limiting sleeve 730 abut against the second movable seat 710. At this time, the first inclined surface and the second inclined surface are separated, the clamping pieces lose external force and deform to recover, so that the first limiting sleeve 720 and the second limiting sleeve 730 are separated from the third leg pipe 410 and the fourth leg pipe 420, respectively.

[0050] 8) with reference to Figure 5 and Figure 6 In some embodiments, the linkage assembly 800 includes a pull rod assembly 810, a first connecting assembly 820 and a second connecting assembly 830; the first connecting assembly 820 is connected between the first locking assembly 600 and one end of the pull rod assembly 810; the second connecting assembly 830 is connected between the second locking assembly 700 and the other end of the pull rod assembly 810.

[0051] Specifically, the pull rod assembly 810 includes a first pull rod 811 inserted into the first leg pipe 310 and a second pull rod 812 inserted into the second leg pipe 320, the first pull rod 811 and the second pull rod 812 are connected with the second locking assembly 700 through the second connecting assembly 830, the third leg pipe 410 is inserted into the first pull rod 811, and the fourth leg pipe 420 is inserted into the second pull rod 812; further, when the motor 520 drives the first locking assembly 600 to the locking position through the transmission shaft 510, the first pull rod 811 and the second pull rod 812 will be driven to move upward through the first connecting assembly 820, and finally the second locking assembly 700 will be driven to enter the locking position synchronously through the second connecting assembly 830; when the motor 520 drives the first locking assembly 600 to the unlocking position through the transmission shaft 510, the first pull rod 811 and the second pull rod 812 will be driven to move downward through the first connecting assembly 820, and finally the second locking assembly 700 will be driven to enter the locking position synchronously through the second connecting assembly 830.

[0052] 9) with reference toFigure 3 And Figure 6 In some embodiments, the first connecting assembly 820 includes a first U-shaped rod 821 and a second U-shaped rod 822, one end of the first U-shaped rod 821 and one end of the second U-shaped rod 822 are rotatably connected with the first locking assembly 600, specifically, one end of the first U-shaped rod 821 is rotatably connected with the third gear 644, and one end of the second U-shaped rod 822 is rotatably connected with the fourth gear 645; further, the other end of the first U-shaped rod 821 is rotatably connected with one end of the first pull rod 811, and the other end of the second U-shaped rod 822 is rotatably connected with one end of the second pull rod 812, so that when the third gear 644 and the fourth gear 645 rotate, the first pull rod 811 and the second pull rod 812 are driven to move upward or downward by the first U-shaped rod 821 and the second U-shaped rod 822 respectively, realizing linkage between the second locking assembly 700 and the first locking assembly 600;

[0053] In some embodiments, the second connecting assembly 830 includes a first pull sleeve 831 and a second pull sleeve 832, the first pull sleeve 831 is connected with the other end of the pull rod assembly 810 and the second locking assembly 700 respectively; specifically, the first pull sleeve 831 is connected with the first limiting sleeve 720, and the second pull sleeve 832 is connected with the second limiting sleeve 730, which can pull the first limiting sleeve 720 and the second limiting sleeve 730 upward or push the first limiting sleeve 720 and the second limiting sleeve 730 downward; in other embodiments, a first adjusting knob 930 threadedly connected with the first pull sleeve 831 and a second adjusting knob 940 threadedly connected with the second pull sleeve 832 are further included, the first adjusting knob 930 and the second adjusting knob 940 are rotated to adjust the locking degree of the first limiting sleeve 720 and the second limiting sleeve 730 on the foot tube.

[0054] 10)Refer to Figure 5 And Figure 7 In some embodiments, the fixed tube group 200 is provided with a battery assembly 900 electrically connected with the motor 520; specifically, the battery assembly 900 is arranged in the first fixed tube 210 and / or the second fixed tube 220, and is detachably connected, which not only can hide and store the battery assembly 900 through the first fixed tube 210 and / or the second fixed tube 220, avoiding affecting the aesthetic appearance due to the battery assembly 900 or the external convex, but also can facilitate the user to replace the battery assembly 900 in time when it is out of power, improving the convenience of use; further, a locking button 950 and an unlocking button 960 electrically connected with the motor 520 are arranged, which can control the forward rotation and reverse rotation of the motor 520 respectively; of course, the three motors 520 on the three supporting feet are controlled by the same locking button 950 and unlocking button 960, realizing one-key type unlocking and locking of the three supporting feet.

[0055] 11) The utility model discloses the advantage lies in: through above -mentioned structure makes the foot pipe locking structure can be applied to the row pipe type support frame, satisfies the row pipe type support frame's solution lock demand, has very good practicality.

[0056] Of course, the utility model is not limited to the above-mentioned embodiment, and the skilled person in the art can also make equivalent transformation or replacement without departing from the spirit of the utility model, and these equivalent transformations and replacements are all included in the range defined by the claims of the present application.

Claims

1. A foot tube locking structure, characterized by: The first movable seat (610), the worm (620), the worm wheel (630), the transmission assembly (640), the first pressing block (650) and the second pressing block (660), the transmission shaft (510), and the first fixed tube (210) and the second fixed tube (220) arranged on both sides of the transmission shaft (510); The first movable seat (610) is arranged between the first fixed tube (210) and the second fixed tube (220) and movably arranged on the transmission shaft (510) to axially move relative to the transmission shaft (510); The worm (620) rotates synchronously with the transmission shaft (510) and is connected with the motor (520) to axially move relative to the transmission shaft (510) under the driving of the motor (520); The worm wheel (630) is arranged on the first movable seat (610) and engaged with the worm (620); The first pressing block (650) and the second pressing block (660) are arranged on both sides of the worm (620); The input end of the transmission assembly (640) is connected with the worm wheel (630), the first output end is connected with the first pressing block (650), and the second output end is connected with the second pressing block (660); When the transmission shaft (510) rotates forward, the worm (620) can drive the first pressing block (650) and the second pressing block (660) to move away from each other through the worm wheel (630) and the transmission assembly (640), so that the first pressing block (650) abuts against the first fixed tube (210) and the second pressing block (660) abuts against the second fixed tube (220); or when the transmission shaft (510) rotates forward, the worm (620) can drive the first pressing block (650) and the second pressing block (660) to move towards each other through the worm wheel (630) and the transmission assembly (640), so that the first pressing block (650) is separated from the first fixed tube (210) and the second pressing block (660) is separated from the second fixed tube (220).

2. A foot tube locking structure according to claim 1, characterized in that: The transmission assembly (640) comprises a connecting rod (641), a first gear (642), a second gear (643), a third gear (644) and a fourth gear (645); The connecting rod (641) is rotatably arranged on the first movable seat (610), and the worm wheel (630) is arranged on the connecting rod (641); The first gear (642) and the second gear (643) are arranged on the connecting rod (641) and arranged on both sides of the worm wheel (630); The third gear (644) is connected with the first pressing block (650) and engaged with the first gear (642); The fourth gear (645) is connected with the second pressing block (660) and engaged with the second gear (643).

3. A foot tube locking structure according to claim 2, characterized in that: The first movable seat (610) is provided with a switching switch (670) and a clutch assembly (680). The switching switch (670) is axially movably arranged on the connecting rod (641) and has a first state and a second state, the first gear (642) and the second gear (643) are arranged on the switching switch (670); The clutch assembly (680) is connected between the worm gear (630) and the switching switch (670) and has an engagement position and a movable position; The switching switch (670) can rotate synchronously with the worm gear (630) when the clutch assembly (680) is in the engagement position, or the switching switch (670) can switch between the first state and the second state when the clutch assembly (680) is in the movable position, and drive the first pressing block (650) and the second pressing block (660) to move away from each other when switching from the first state to the second state, and drive the first pressing block (650) and the second pressing block (660) to move towards each other when switching from the second state to the first state.

4. A foot tube locking structure according to claim 3, characterized in that: The clutch assembly (680) includes a clutch protrusion (681) arranged on the worm gear (630) and a clutch groove (682) arranged on the switching switch (670), the clutch protrusion (681) is in the engagement position when inserted into the clutch groove (682), and the clutch protrusion (681) is in the movable position when separated from the clutch groove (682).

5. A foot tube locking structure according to claim 3, wherein: Further comprising a reset spring (690) sleeved on the connecting rod (641) and abutting against the worm gear (630) and the switching switch (670) respectively.

6. A foot tube locking structure according to claim 1, characterized by: The first fixed tube (210) and / or the second fixed tube (220) is provided with a battery assembly (900) electrically connected with the motor (520).

7. A support foot characterised in that: The foot tube locking structure of any one of claims 1-6.

8. A support frame characterized by: The supporting foot of claim 7.

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