Table edge positioning device

Abstract

The utility model discloses a table edge positioning device which comprises a tray suitable for being placed on a table top; the top frame is connected with the tray; the bottom frame is arranged below the top frame in a spaced mode and hinged to the top frame through a hinge structure, a clamping part is arranged on one side of the bottom frame and located under the tray, a driving part is arranged on the other side of the bottom frame, and the clamping part and the driving part are located on the two sides of the hinge structure; the telescopic end of the telescopic mechanism is connected with the driving part of the bottom frame, the fixed end of the telescopic mechanism is connected with the top frame, and when the telescopic mechanism drives the driving part to swing, the clamping part swings in the direction opposite to the swinging direction of the driving part. The clamping device is simple in structure and can be quickly and smoothly mounted and dismounted, the clamping part is directly driven to act through the telescopic mechanism, a user only needs to operate the telescopic mechanism, clamping or releasing can be quickly completed, tool assistance is not needed, and the mounting and dismounting operation time is greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to dining chair technical field, concretely relates to a table edge positioning device. BACKGROUND

[0002] The existing market table edge dining chair is various, and most of them are fixed through the threaded fixing structure, need to align the hole position and tighten the nut one by one, and the installation and dismounting process is relatively complicated, cannot be installed and dismounted simply and quickly. INVENTION CONTENTS

[0003] Therefore, the utility model provides a table edge positioning device to solve the inconvenient installation and dismounting of the existing table edge dining chair.

[0004] The utility model provides a table edge positioning device, which comprises:

[0005] A tray is adapted to be placed on a table top;

[0006] A top frame is connected with the tray;

[0007] A bottom frame is arranged below the top frame and connected with the top frame through a hinge structure, one side of the bottom frame is a clamping part, the clamping part is located directly below the tray, the other side of the bottom frame is a driving part, the clamping part and the driving part are located on both sides of the hinge structure;

[0008] A telescopic mechanism is connected with the driving part of the bottom frame through a telescopic end, and a fixed end of the telescopic mechanism is connected with the top frame, when the driving part is swung by the telescopic mechanism, the clamping part swings in the direction opposite to the swinging direction of the driving part.

[0009] The table edge positioning device has the advantages that the utility model is simple in structure, can be quickly and smoothly installed and dismounted, solves the problem that the existing table edge dining chair is complicated to install and cannot be quickly installed and folded.

[0010] The hinge structure forms a lever effect between the clamping part and the driving part, converts the movement of the driving part driven by the telescopic mechanism into the movement of the clamping part, and directly fixes the clamping part to the table edge through the cooperation of the clamping part and the tray, without the need for drilling holes, thereby protecting the integrity of the table top.

[0011] The telescopic mechanism directly drives the clamping part to act, the user only needs to operate the telescopic mechanism, and the clamping or releasing can be quickly completed without the need for tools, thereby greatly shortening the operation time of installation and dismounting.

[0012] The clamping part and the tray form a two-way fixing structure, can resist lateral shaking and vertical load, ensure the stability of the dining chair in dynamic use, and reduce the risk of overturning.

[0013] The stroke of the telescopic mechanism is adjustable, and the swinging angle of the clamping part changes with the movement of the driving part. When the edge of the table body is too thick and needs to be rotated, the driving part is swung to different positions by the telescopic mechanism to control the distance between the clamping part and the tray, so that the table edge of different thicknesses can be compatible, and the versatility is high.

[0014] In an alternative embodiment, the telescopic mechanism comprises:

[0015] A fixed shell, the top end of which is fixedly connected with the top frame;

[0016] A telescopic assembly arranged on the fixed shell;

[0017] A locking assembly arranged on the fixed shell, the locking assembly having a locked position for limiting the movement of the telescopic assembly and an unlocked position for not limiting the movement of the telescopic assembly.

[0018] The beneficial effects of the above technical solution are that the locking assembly can realize instant control of the movement of the telescopic assembly by switching between the locked position and the unlocked position, and the clamping and fixing or releasing and disassembling can be quickly completed without the need for tool assistance. The telescopic assembly can be freely telescoped in the unlocked state, allowing the user to fine-tune the clamping range according to the thickness of the table edge, and avoiding the tedious steps of repeatedly trying to screw in the traditional threaded structure.

[0019] In an alternative embodiment, a first through hole is vertically and throughly arranged on the fixed shell;

[0020] The telescopic assembly comprises:

[0021] A telescopic rod, the telescopic rod being movably arranged through the first through hole, and the bottom end of the telescopic rod being fixedly connected with the driving part of the bottom frame;

[0022] A linear driving structure connected with the telescopic rod and adapted to drive the telescopic rod to linearly move along the first through hole.

[0023] In an alternative embodiment, the linear driving structure comprises:

[0024] A rack arranged on the side of the telescopic rod;

[0025] A gear arranged in meshing with the rack;

[0026] A rotating disc coaxially connected with the gear;

[0027] A knob located outside the fixed shell, the knob being coaxially connected with the rotating disc and capable of driving the rotating disc to rotate.

[0028] The beneficial effects of the above technical solutions are that the user can accurately control the lifting amount of the telescopic rod by rotating the knob, thereby meeting the fine adjustment requirement for clamping pressure or clamping thickness.

[0029] In an alternative embodiment, the side wall of the rotating disc is provided with at least one positioning hole; the knob corresponding to one side of the rotating disc is provided with at least one positioning pin, the positioning pin passes through the positioning hole and is locked with the rotating disc by a locking member;

[0030] In an alternative embodiment, the diameter of the knob is greater than the diameter of the gear, so that the user only needs to exert a small force to drive the high-load telescopic rod, which is very convenient.

[0031] In an alternative embodiment, the side wall of the fixed shell is provided with a second through hole; the circumferential outer wall of the rotating disc is provided with a plurality of first ratchets;

[0032] The locking assembly comprises:

[0033] A button which passes through the second through hole and slides in the direction of the second through hole, one end of the button is located inside the fixed shell, and the other end of the button is located outside the fixed shell;

[0034] A swing rod which is hinged to one end of the button inside the fixed shell, the swing rod is provided with a second ratchet on the side opposite to the rotating disc, and a spring is arranged between the side of the swing rod opposite to the second ratchet and the inner wall of the fixed shell; the second ratchet has a locking position engaged with the first ratchet under the action of the spring and an unlocking position disengaged from the first ratchet under the driving of the button.

[0035] In an alternative embodiment, the bottom end of the tray is provided with at least one first anti-skid pad.

[0036] In an alternative embodiment, the clamping part of the bottom frame extends upward, and the end of the clamping part extending upward is provided with at least one second anti-skid pad.

[0037] In an alternative embodiment, the distance between the clamping part and the hinge structure is less than the distance between the driving part and the hinge structure, so that the driving part can generate greater clamping force on the clamping part by exerting smaller force, thereby saving labor when installing and dismounting the device as a whole.

[0038] In an alternative embodiment, the top frame is a first pipe body arranged in a bent manner, and the bottom frame is a second pipe body arranged in a bent manner.

[0039] The hinged structure comprises at least one connecting pipe, a top end of the connecting pipe is fixedly arranged on the first pipe body, a bottom end of the connecting pipe is provided with a hinge part, and the second pipe body passes through the hinge part and is hinged with the hinge part through a hinge shaft.

[0040] In an alternative embodiment, the side of the tray is provided with a first pipe body positioning member, a socket is horizontally arranged in the first pipe body positioning member, and the first pipe body is positioned in the socket.

[0041] In an alternative embodiment, the top frame and the bottom frame are externally sleeved with a seat cover outside a part not falling within the projection range of the tray, and the seat cover is provided with a webbing. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0043] Figure 1 A structural schematic view of a table edge positioning device provided by the present application;

[0044] Figure 2 A plan view of a table edge positioning device provided by the present application;

[0045] Figure 3 A first perspective view of an extension mechanism in a table edge positioning device provided by the present application;

[0046] Figure 4 A second perspective view of an extension mechanism in a table edge positioning device provided by the present application;

[0047] Figure 5 A structural schematic view of a locking assembly in a table edge positioning device provided by the present application;

[0048] Figure 6 A structural schematic view of a tray in a table edge positioning device provided by the present application;

[0049] Figure 7 A structural schematic view of a table edge positioning device provided by the present application when arranging a seat cover.

[0050] BRIEF DESCRIPTION OF DRAWINGS

[0051] 1, tray, 11, first pipe body positioning member, 12, first anti-skid pad;

[0052] 2. The top frame;

[0053] 3. The bottom frame, 31, the clamping part, 32, the driving part, 33, the second non-slip pad;

[0054] 4. The hinged structure, 41, the connecting pipe, 42, the hinge part;

[0055] 5. The telescopic mechanism, 51, the fixed shell, 511, the first through hole, 512, the second through hole, 52, the telescopic assembly, 521, the telescopic rod, 522, the rack, 523, the rotating disc, 5231, the first ratchet, 5232, the positioning hole, 524, the gear, 525, the knob, 5251, the positioning pin, 53, the locking assembly, 531, the button, 5311, the long hole, 532, the swing rod, 5321, the second ratchet, 534, the spring;

[0056] 6. The seat cover;

[0057] 7. The braid. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0059] The existing market table edge dining chair is various, and most of them are fixed by a threaded fixing structure, and the installation and dismounting process is relatively complicated, and the installation and dismounting cannot be completed simply and quickly. And when the threaded fixing structure is used to position the dining chair, the structure of the table body is damaged.

[0060] Therefore, the utility model provides a table edge positioning device, which is simple in structure, can be installed and dismounted quickly and smoothly, solves the problem that the installation process of the existing table edge dining chair is complicated and cannot be completed quickly, and realizes the installation operation and folding.

[0061] According to the embodiments of the utility model, a table edge positioning device is provided, which is simple in structure, can be installed and dismounted quickly and smoothly, solves the problem that the installation process of the existing table edge dining chair is complicated and cannot be completed quickly, and realizes the installation operation and folding. Figures 1 to 7As shown, it comprises a tray 1, a top frame 2, a bottom frame 3 and a telescopic mechanism 5. The tray 1 is suitable for being placed on a table top. The top frame 2 is connected with the tray 1. The bottom frame 3 is arranged at a lower side of the top frame 2 and is hinged between the top frame 2 through a hinge structure 4. One side of the bottom frame 3 is a clamping part 31 which is located directly below the tray 1. The other side of the bottom frame 3 is a driving part 32. The clamping part 31 and the driving part 32 are located on both sides of the hinge structure 4. The telescopic end of the telescopic mechanism 5 is connected with the driving part 32 of the bottom frame 3. The fixed end of the telescopic mechanism 5 is connected with the top frame 2. When the telescopic mechanism 5 drives the driving part 32 to swing, the clamping part 31 swings in a direction opposite to the swinging direction of the driving part.

[0062] The hinge structure 4 forms a lever effect between the clamping part 31 and the driving part 32, converts the movement of the driving part 32 driven by the telescopic mechanism 5 into the movement of the clamping part 31, and directly fixes the tray 1 to the edge of the table through the cooperation of the clamping part 31 and the tray 1 by using the clamping force without drilling holes, thereby protecting the integrity of the table top.

[0063] The telescopic mechanism 5 directly drives the clamping part 31 to act. A user only needs to operate the telescopic mechanism 5 to quickly complete clamping or releasing without the aid of tools, thereby greatly shortening the operation time of installation and disassembly.

[0064] The clamping part 31 and the tray 1 form a bidirectional fixing in an up-down direction, can resist lateral shaking and vertical load, ensure the stability of the dining chair in dynamic use (such as human sitting posture adjustment), and reduce the risk of overturning.

[0065] The stroke of the telescopic mechanism 5 is adjustable. The swinging angle of the clamping part 31 dynamically changes with the movement of the driving part 32. When the edge of the table body is too thick to be rotated, the driving part 32 is swung to different positions through the telescopic mechanism 5 to control the distance between the clamping part 31 and the tray 1, thereby being compatible with the edges of tables with different thicknesses and having strong universality and being applicable to table bodies with different thicknesses.

[0066] In some embodiments, the telescopic mechanism 5 is combined with the hinge structure 4. Figure 3 As shown, the telescopic mechanism 5 comprises a fixed shell 51, a telescopic assembly 52 and a locking assembly 53. The top end of the fixed shell 51 is fixedly connected with the top frame 2. More specifically, the top end of the fixed shell 51 is provided with a groove. The top frame 2 abuts against the groove. The fixed shell 51 and the top frame 2 are stably connected through a connecting bolt. The telescopic assembly 52 is arranged on the fixed shell 51. The locking assembly 53 is arranged on the fixed shell 51. The locking assembly 53 has a locking position for limiting the movement of the telescopic assembly 52 and an unlocking position for not limiting the movement of the telescopic assembly 52.

[0067] In the present embodiment, the locking assembly 53 realizes instant control of the movement of the telescopic assembly 52 by switching between the "locked position" and the "unlocked position", and can quickly complete clamping and fixing or release and disassembly without the need for tool assistance throughout. The telescopic assembly 52 can freely telescope in the unlocked state, allowing the user to fine-tune the clamping range according to the thickness of the table edge, avoiding the tedious steps of repeatedly trying to screw with a traditional threaded structure.

[0068] As a specific embodiment, a first through hole 511 is vertically and throughly provided on the fixed shell 51. The telescopic assembly 52 includes a telescopic rod 521 and a linear driving structure. The telescopic rod 521 is movably arranged through the first through hole 511, and the bottom end of the telescopic rod 521 is fixedly connected to the driving part 32 of the base frame 3. The linear driving structure is connected with the telescopic rod 521 and is adapted to drive the telescopic rod 521 to move linearly along the first through hole 511.

[0069] In combination Figure 3 As shown, the linear driving structure includes a rack 522, a gear 524, a rotating disc 523, and a knob 525. The rack 522 is arranged on the side of the telescopic rod 521. The gear 524 is arranged in meshing with the rack 522. The rotating disc 523 is coaxially connected with the gear 524. The knob 525 is located outside the fixed shell 51, and the knob 525 is coaxially connected with the rotating disc 523 and can drive the rotating disc 523 to rotate. The knob 525 is located outside the fixed shell 51, and the surface thereof can be designed with anti-slip protrusions to increase the friction force with the human hand, facilitating the human hand to hold and rotate.

[0070] When it is necessary to increase the clamping force between the clamping part 31 and the tray 1, the human hand holds the outer edge of the knob 525 and slowly rotates, the knob drives the rotating disc 523 and the gear 524 to rotate coaxially, the gear meshes with the rack 522, pushes the telescopic rod 521 to move linearly downward along the first through hole 511, and in turn drives the driving part 32 to swing downward, so that the clamping part 31 swings upward, and in turn reduces the distance between the clamping part 31 and the table body. When it is necessary to reduce the clamping force between the clamping part 31 and the tray 1 or to disassemble the clamping part 31 from the position of the table body, the knob 525 is rotated in the opposite direction, the gear 524 drives the rack 522 to move upward, and in turn pulls the telescopic rod 521 to retract upward, and in turn drives the driving part 32 to swing upward, so that the clamping part 31 swings downward.

[0071] In the present embodiment, the user can accurately control the lifting amount of the telescopic rod 521 by rotating the knob 525, meeting the fine adjustment requirements for the clamping pressure or the clamping thickness.

[0072] It should be noted that the telescopic mechanism 5 is not limited to the manual telescopic mechanism of the above-mentioned embodiment, and can also adopt an automatic telescopic mechanism, such as an electric push rod, a pneumatic cylinder, a hydraulic cylinder, etc.

[0073] In some embodiments, in combination Figure 3As shown, the side wall of the rotating disk 523 is provided with at least one positioning hole 5232. The knob 525 is provided with at least one positioning pin 5251 on one side of the rotating disk 523. The positioning pin 5251 passes through the positioning hole 5232 and is locked to the rotating disk 523 by a locking element, which is a nut. Furthermore, multiple positioning holes 5232 can be evenly spaced circumferentially on the side wall of the rotating disk 523, and correspondingly, multiple positioning pins 5251 can be provided on one side of the rotating disk 523.

[0074] In some embodiments, the diameter of the knob 525 is larger than the diameter of the gear 524. According to the formula: Torque = Hand Force × Knob Radius, increasing the knob diameter (i.e., increasing the radius) can significantly increase the input torque with the same hand force. Users only need to apply a small amount of force to drive the high-load telescopic rod 521, which is very convenient.

[0075] In some embodiments, a second through hole 512 is provided on the side wall of the fixed housing 51. A plurality of first ratchet teeth 5231 are provided on the circumferential outer wall of the rotating disk 523.

[0076] The locking assembly 53 includes a button 531 and a swing arm 532. The button 531 passes through the second through hole 512 and slides along the direction of the second through hole 512. One end of the button 531 is located inside the fixed housing 51, and the other end of the button 531 is located outside the fixed housing 51. The swing arm 532 is hinged to the end of the button 531 located inside the fixed housing 51. A second ratchet 5321 is provided on the side of the swing arm 532 opposite to the rotating disk 523. A spring 534 is provided between the side of the swing arm 532 opposite to the second ratchet 5321 and the inner wall of the fixed housing 51. The second through hole 512 is arranged at an angle, and the button 531 is also arranged at an angle accordingly. The swing arm 532 is located below the rotating disk 523, and the hinge position between the swing arm 532 and the button 531 is also located below the rotating disk 523. There is a certain angle between the swing arm 532 and the button 531. The second ratchet 5321 has a locked position where it engages with the first ratchet 5231 under the action of the spring 534, and an unlocked position where it disengages from the first ratchet 5231 under the drive of the button 531.

[0077] To prevent button 531 from slipping, combined with Figure 5 As shown, a long hole 5311 is provided on the side of the button 531, and a limiting post is provided inside the fixed housing 51. The limiting post moves through the long hole 5311. When the button 531 slides, the limiting post restricts the sliding position of the button 531, thereby preventing the button 531 from slipping.

[0078] In the embodiment, the first ratchet 5231 of the rotating disc 523 and the second ratchet 5321 of the swing rod 532 form an inclined surface engagement, and the one-way engagement characteristic of the ratchet is used to achieve one-way self-locking. When applied to seat height adjustment, it can ensure that the load (such as human weight) does not cause the rotating disc 523 to be accidentally reversed during lifting, thereby ensuring safety.

[0079] For one-key unlocking function triggered by pressing the key: when the key 531 is pressed, the key 531 slides along the second through hole 512, drives the swing rod 532 to rotate around the hinge point, forces the second ratchet 5321 to disengage from the first ratchet 5231, and releases the engagement locking. At this time, the rotating disc 523 can rotate freely in both directions.

[0080] When the user releases the key 531, the spring 534 pushes the swing rod 532 back to its original position, and the second ratchet 5321 re-engages with the first ratchet 5231. No manual reset is required, simplifying the operation process.

[0081] In some embodiments, the bottom end of the tray 1 is provided with at least one first anti-skid pad 12. When the tray 1 is positioned on the table, the friction between the tray 1 and the table can be increased by the first anti-skid pad 12 to prevent the tray 1 from slipping off.

[0082] In some embodiments, the clamping portion 31 of the bottom frame 3 extends upward. The end of the upwardly extending clamping portion 31 is provided with at least one second anti-skid pad 33.

[0083] In some embodiments, the distance (power arm) between the clamping portion 31 and the hinge structure 4 is smaller than the distance (resistance arm) between the driving portion 32 and the hinge structure 4, forming a labor-saving lever structure. According to the lever formula: F1×L1=F2×L2 (L1 is the power arm and L2 is the resistance arm), a smaller force F1 applied by the driving portion 32 can generate a larger clamping force F2 at the clamping portion 31, thereby saving a lot of labor when installing and disassembling the device as a whole.

[0084] In some embodiments, the top frame 2 is a first pipe body arranged in a bent manner, and the first pipe body is a U-shaped pipe formed by bending one pipe. The bottom frame 3 is a second pipe body arranged in a bent manner, and the second pipe body is a U-shaped pipe formed by bending. The hinge structure 4 includes at least one connecting pipe 41, the top end of the connecting pipe 41 is fixedly arranged on the first pipe body, the bottom end of the connecting pipe 41 is provided with a hinge portion 42, and the second pipe body passes through the hinge portion 42 and is hinged with the hinge portion 42 through a hinge shaft.

[0085] In some embodiments, the side portion of the tray 1 is provided with a first pipe body positioning piece 11, and a socket is horizontally arranged in the first pipe body positioning piece 11. The first pipe body is positioned and installed in the socket and locked by a screw.

[0086] In some embodiments, in combination with Figure 7As shown, the top frame 2 and the bottom frame 3 are sleeved outside the part outside the projection range of the tray 1 by the seat cover 6, and the seat cover 6 is provided with a webbing 7.

[0087] The process of installing the table edge positioning device to the table body is:

[0088] The tray 1 is horizontally placed at the edge of the table top, and the projection range thereof covers the swing path of the clamping part 31. The first anti-skid pad at the bottom of the tray 1 is in contact with the table top to increase the friction force and prevent the tray from slipping during the installation process.

[0089] The knob 525 is rotated to drive the telescopic rod 521 to linearly move, drive the driving part 32 to swing, and swing the clamping part 31 in the opposite direction through the lever effect, so as to adjust the distance between the clamping part 31 and the tray 1.

[0090] After the knob 525 is rotated to the clamping part 31 and the edge of the table top is in close contact, the knob is released, the spring 534 pushes the swing rod 532 to return to the original position, the second ratchet 5321 is engaged with the first ratchet 5231, and the position of the telescopic rod 521 is locked.

[0091] The process of dismounting the table edge positioning device from the table body is:

[0092] The button 531 of the locking assembly 53 is pressed to trigger the ratchet disengagement mechanism. The button 531 slides along the inclined second through hole 512 to drive the swing rod 532 to rotate around the hinge point, so as to force the second ratchet 5321 to disengage from the first ratchet 5231 of the rotating disc 523 (unlocked position). The spring 534 is compressed, the rotation of the rotating disc 523 is released, and the knob 525 can be freely rotated in both directions at this time.

[0093] The knob 525 drives the rotating disc 523 and the gear 524 to rotate in the opposite direction, the gear engages with the rack 522 to move upward, and the telescopic rod 521 is retracted along the first through hole 511. When the telescopic rod 521 is retracted, the driving part 32 swings upward, and through the lever effect of the hinge structure 4, the clamping part 31 swings downward, the distance between the clamping part 31 and the tray 1 is increased, and the clamping force is gradually released.

[0094] The knob 525 is continuously rotated until the clamping part 31 is completely separated from the edge of the table, and the second anti-skid pad 33 is not in contact with the bottom of the table. The tray 1 is horizontally pulled outward, and the device is removed from the edge of the table.

[0095] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A table edge positioning device, characterized in that, The utility model relates to a kind of tray and its drive mechanism, including: Tray (1), the tray (1) is suitable for being placed on desktop; Top frame (2), the top frame (2) is connected with the tray (1); Bottom frame (3), the bottom frame (3) is spaced below the top frame (2) and is hinged between the top frame (2) by hinged structure (4), one side of the bottom frame (3) is clamping part (31), the clamping part (31) is located directly below the tray (1), the other side of the bottom frame (3) is drive part (32), the clamping part (31) and the drive part (32) are located on both sides of the hinged structure (4); Telescopic mechanism (5), the telescopic end of the telescopic mechanism (5) is connected with the drive part (32) of the bottom frame (3), the fixed end of the telescopic mechanism (5) is connected with the top frame (2), when the telescopic mechanism (5) drives the drive part (32) swing, the clamping part (31) swings to the direction opposite to the drive part swing direction.

2. The table edge positioning device of claim 1, wherein, The telescopic mechanism (5) includes: Fixed shell (51), the top end of the fixed shell (51) is fixedly connected with the top frame (2); Telescopic assembly (52), the telescopic assembly (52) is arranged on the fixed shell (51); Locking assembly (53), the locking assembly (53) is arranged on the fixed shell (51), the locking assembly (53) has locking position that restricts the movement of the telescopic assembly (52) and unlocking position that does not limit the movement of the telescopic assembly (52).

3. The table edge positioning device of claim 2, wherein, The first through-hole (511) is vertically and throughly arranged on the fixed shell (51); The telescopic assembly (52) includes: Telescopic rod (521), the telescopic rod (521) is movably arranged through the first through-hole (511), and the bottom end of the telescopic rod (521) is fixedly connected on the drive part (32) of the bottom frame (3); Linear drive structure, the linear drive structure is connected with the telescopic rod (521) and is suitable for driving the telescopic rod (521) to linearly move along the first through-hole (511).

4. The table edge positioning device of claim 3, wherein, The linear drive structure includes: Rack (522), the rack (522) is arranged on the side of the telescopic rod (521); Gear (524), the gear (524) is arranged in mesh with the rack (522); Rotary disc (523), the rotary disc (523) is coaxially connected with the gear (524); Knob (525), the knob (525) is located outside the fixed shell (51), the knob (525) is coaxially connected with the rotary disc (523) and can drive the rotary disc (523) to rotate.

5. The table edge positioning device of claim 4, wherein, At least one positioning hole (5232) is arranged on the side wall of the rotary disc (523);At least one positioning pin (5251) is arranged on the side of the knob (525) corresponding to the rotary disc (523), the positioning pin (5251) passes through the positioning hole (5232) and is locked with the rotary disc (523) by locking member.

6. The table edge positioning device of claim 4, wherein, The diameter of the knob (525) is greater than the diameter of the gear (524).

7. The table edge positioning device of claim 4, wherein, The side wall of the fixed shell (51) is provided with a second through hole (512); the circumferential outer wall of the rotating disc (523) is provided with a plurality of first ratchet teeth (5231); The locking assembly (53) comprises: A key (531) which passes through the second through hole (512) and slides in the direction of the second through hole (512), one end of the key (531) being located inside the fixed shell (51), the other end of the key (531) being located outside the fixed shell (51); A swing rod (532) which is hinged to the end of the key (531) located inside the fixed shell (51), the swing rod (532) being provided with second ratchet teeth (5321) on the side opposite to the rotating disc (523), a spring (534) being arranged between the inner wall of the fixed shell (51) and the side of the swing rod (532) opposite to the second ratchet teeth (5321); the second ratchet teeth (5321) have a locking position in engagement with the first ratchet teeth (5231) under the action of the spring (534) and an unlocking position disengaged from the first ratchet teeth (5231) under the driving of the key (531).

8. The table edge positioning device of any one of claims 1-7, wherein, The bottom end of the tray (1) is provided with at least one first anti-skid pad (12); And / or, the clamping part (31) of the bottom frame (3) extends upward, the end of the clamping part (31) extending upward being provided with at least one second anti-skid pad (33).

9. The table edge positioning device of any of claims 1-7, wherein, The distance between the clamping part (31) and the hinged structure (4) is smaller than the distance between the driving part (32) and the hinged structure (4).

10. The table edge positioning device of any one of claims 1-7, wherein, The top frame (2) is a first pipe body arranged in a bent manner, and the bottom frame (3) is a second pipe body arranged in a bent manner; The hinged structure (4) comprises at least one connecting pipe (41), the top end of the connecting pipe (41) being fixedly arranged on the first pipe body, the bottom end of the connecting pipe (41) being provided with a hinged part (42), the second pipe body passing through the hinged part (42) and being hinged to the hinged part (42) through a hinge shaft.

11. The table edge positioning device of claim 10, wherein, The side part of the tray (1) is provided with a first pipe body positioning piece (11), a socket being horizontally arranged in the first pipe body positioning piece (11), and the first pipe body is inserted and positioned in the socket.

12. The table edge positioning device of any one of claims 1-7, wherein, The top frame (2) and the bottom frame (3) are provided with seat covers (6) outside the parts not falling into the projection range of the tray (1), and the seat covers (6) are provided with webbings (7).

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