Quickly-assembled table frame structure and mounting and dismounting method thereof

Abstract

The invention relates to a rapidly-assembled table frame structure and a mounting and dismounting method thereof. The rapidly-assembled table frame structure comprises a stand column assembly, a connecting beam and a locking assembly. The connecting beam is detachably connected with the stand column assembly. The locking assembly is preassembled on the connecting beam through a fastener, and the locking assembly can axially rotate around the fastener; the locking assembly comprises a cam and a handle connected with the cam, and the handle is used for driving the cam to rotate around the fastener; when the handle is in the first state, the front end face of the cam tightly abuts against the stand column assembly, and the stand column assembly is locked to the connecting beam. And when the handle is in the second state, the cam and the stand column assembly are loosened, and the stand column assembly is unlocked. The cam is driven to rotate by turning over the handle, multi-step actions of'buckle embedding-cam abutting-limiting locking 'are synchronously completed, extra tools or complex adjustment is not needed, and the operation difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furniture, in particular to a quickly assembled table frame structure and a mounting and dismounting method thereof. BACKGROUND

[0002] Electric lifting tables are increasingly used in people's daily life, and their function of quickly adjusting the height of the table top well meets the needs of long-term desk workers for alternating sitting and standing. An electric lifting table is usually composed of a table top, a table frame assembly, a lifting column, a foot plate and an electrical unit (control box, hand controller, etc.). The lifting column is installed below the table frame assembly and is fastened to the table frame assembly by a plurality of screws, which makes the installation difficult and inefficient. In today's society, the pace of work and life is accelerating, and electric lifting tables often face problems such as centralized storage, transfer and transportation, and reassembly after disassembly, which puts forward new demands for the quick disassembly of electric lifting tables.

[0003] Chinese patent CN209359912U discloses a quickly assembled support structure suitable for dining tables, desks, office tables, conference tables, children's tables or tea tables, etc., which comprises a support assembly and a column for supporting the support assembly. The upper part of the column is quickly connected with the support assembly by a matched buckle slot and buckle pin, and the support assembly or the column has a locking assembly for locking the buckle connection between the column and the support assembly. The locking assembly moves relative to the buckle slot by pushing the buckle pin, so that the buckle pin and the buckle slot are pressed against each other, thereby locking the buckle connection between the column and the support assembly. The table top support does not need too many screws during assembly, and can be quickly installed and dismounted, improving the overall installation and dismounting efficiency.

[0004] However, the locking assembly in the above-mentioned prior art is a separate part, which is easy to lose, and needs to be manually inserted into the mounting hole during assembly, increasing the assembly difficulty. If the user forgets to install the locking assembly, the column and the table top support are easy to separate, causing a large safety hazard. In addition, during use, once the locking assembly is mistakenly opened, the locking assembly is easy to fall off, and there is a risk of separation between the column and the support assembly, causing a safety hazard. SUMMARY

[0005] In view of the defects of the above-mentioned prior art locking assembly, such as being small and easy to lose, and complicated installation, the purpose of the present application is to provide a lifting table structure that is easy to install and dismount.

[0006] The technical solution provided by the present application is as follows: A quickly assembled table frame structure, comprising a column assembly and a connecting beam detachably connected with the column assembly; further comprising a locking assembly, which is pre-installed on the connecting beam by a fastener, and the locking assembly can rotate axially around the fastener; The locking assembly comprises a cam and a handle connected with the cam, the handle being used to drive the cam to rotate around the fastener; When the handle is in the first state, the front end surface of the cam is in close contact with the stand column assembly, so that the stand column assembly is locked to the connecting beam; When the handle is in the second state, the cam is released from the stand column assembly, and the stand column assembly is unlocked.

[0007] Further, the stand column assembly comprises a motor box and a stand column body connected with the motor box, the motor box being detachably connected with the connecting beam, and the motor box comprising a plane used to abut against the cam.

[0008] Further, the end of the cam is in a variable-diameter arc shape, and the maximum point of the outer diameter of the cam is P point; During the rotation of the handle from the second state to the first state, the abutment point between the end surface of the cam and the plane moves to P point, and the radius between the abutment point and the fastener gradually increases; When the handle is in the first state, the abutment point between the cam and the plane passes P point, and the radius between the abutment point and the fastener is smaller than the radius between P point and the fastener.

[0009] Further, a normal line A perpendicular to the plane is made through the center of the fastener, and the intersection between the normal line A and the plane is O point; During the rotation of the handle from the second state to the first state, P point passes O point.

[0010] Further, a limiting mechanism is arranged on the locking assembly, and the limiting mechanism is movably connected with the locking assembly; a limiting hole corresponding to the limiting mechanism is arranged on the connecting beam; At least one end of the limiting mechanism can pass out of the locking assembly and can be selectively inserted into the limiting hole; When the limiting mechanism is inserted into the limiting hole, the limiting mechanism is used to limit the rotation of the cam, so as to lock the stand column assembly.

[0011] Further, the limiting mechanism comprises, an operation part, under the action of an external force, the operation part being movable relative to the locking assembly; a limiting part, when the operation part moves relative to the locking assembly, the limiting part being driven to be pulled out of or inserted into the limiting hole; a resilient part, the operation part being movably connected with the locking assembly through the resilient part.

[0012] Further, the operation part comprises a handle, the handle being protruded from the surface of the locking assembly; The limiting part comprises a first limiting member, one end of which is fixedly connected with the handle; the locking assembly is provided with a cavity for accommodating the first limiting member; The elastic component comprises a first spring, which is sleeved on the first limiting member and located in the cavity, one end of the first spring being in abutment with the cavity and the other end being fixedly connected with the end of the first limiting member away from the handle.

[0013] When the handle is pulled, the first limiting member can move in the cavity along the axis direction of the first spring to be inserted into or separated from the limiting hole.

[0014] Further, the operation part comprises a pressing part, which protrudes from the surface of the locking assembly; The limiting part comprises a second limiting member, which is in sliding connection with the pressing part; The elastic component comprises a second spring, one end of which is in abutment with the locking assembly and the other end is in abutment with the pressing part.

[0015] Further, the pressing part is provided with a pin shaft, and the second limiting member is provided with a guide groove for sliding of the pin shaft, the two ends of the guide groove being closed; When the pressing part moves relative to the locking assembly, the pin shaft slides along the guide groove, driving the second limiting member to move along the axial direction of the fastener to be inserted into or separated from the limiting hole.

[0016] Further, the operation part comprises a sliding part; The limiting part comprises a third limiting member, which is fixedly connected with the sliding part; The elastic component comprises a third spring, one end of which is in abutment with the locking assembly and the other end is in abutment with the third limiting member; When the sliding part is slid, the third limiting member moves along the axis direction of the third spring to be inserted into or separated from the limiting hole.

[0017] Further, the connecting beam is provided with at least one protruding pin; wherein, When the column assembly is in the unlocked state and the cam is in abutment with the protruding pin, the protruding pin can limit the excessive turning of the cam; Or when the handle is rotated from the second state to the first state until the locking assembly is in abutment with the protruding pin, the protruding pin can limit the continuous rotation of the cam.

[0018] Further, the connecting beam is provided with a transition groove; one end of the limiting part away from the operation part is provided with a protruding head, which is generally a cone and gradually shrinks toward the side of the transition groove; Wherein, along the height direction of the column body, the size of the conical flared end of the convex head is larger than the opening size of the transition groove; When the limiting part engages with the transition groove, only the tapered tapered end of the convex head is embedded in the transition groove, while the tapered flared end is located outside the transition groove.

[0019] Furthermore, when the limiting part engages with the transition groove, the contact point between the cam and the plane does not pass through the point of maximum outer diameter of the cam; When the limiting part is inserted into the limiting hole, the convex head is fully embedded in the limiting hole, and the contact point between the cam and the plane exceeds the maximum point of the cam's outer diameter.

[0020] Furthermore, there is at least one pair of connecting beams, and the column assembly and locking assembly are both located between the pair of connecting beams.

[0021] Furthermore, the motor box is snapped together with the connecting beam, and the sides of the motor box opposite to the connecting beam are provided with snap-fit ​​components, while the inner side of the connecting beam is provided with a slot component that is adapted to the snap-fit ​​components.

[0022] A method for quickly assembling a table frame structure, the installation steps are as follows: S1: Move the limiting part out of the limiting hole on the connecting beam to release the rotation restriction of the cam; S2: Gradually bring the buckle assembly on the motor box closer to and snap it into the slot assembly on the connecting beam; S3: The flip handle drives the cam to rotate until the first limit piece automatically pops into the limit hole, and the column assembly is locked on the connecting beam.

[0023] A method for quickly assembling a table frame structure, the installation steps are as follows: S1': Gradually bring the buckle assembly on the motor box closer to and snap it into the slot assembly on the connecting beam. Under the gravity of the motor box, the second or third limiting piece disengages from the transition groove. S2': Press the handle to rotate the cam until the second or third limit piece automatically pops into the limit hole on the connecting beam, and the column assembly is locked on the connecting beam.

[0024] Furthermore, as the latching assembly approaches the slot assembly, the bottom of the motor housing first contacts the cam, and under the push of the bottom of the motor housing, the cam, together with the handle, rotates around the fastener.

[0025] A method for disassembling a quickly assembled table frame structure, the disassembly steps are as follows: T1: Move the limiting part out of the limiting hole on the connecting beam to release the rotation restriction of the cam; T2: Rotate the handle in the opposite direction so that the contact point between the end face of the cam and the plane of the motor box moves away from point O, and the cam is released from the motor box; T3: Remove the column assembly from the connecting beam.

[0026] Compared with the prior art, the technical solution provided by this invention has the following advantages: (1) The locking component of the present invention is pre-installed on the connecting beam. When consumers assemble the product, they can skip the step of installing the locking component and effectively avoid the risk of missing the locking component, thus reducing the difficulty of operation and the probability of error in the assembly process.

[0027] (2) The present invention drives the cam to rotate by flipping the handle, and simultaneously completes the multi-step action of "buckle insertion - cam clamping - limit locking", without the need for additional tools or complex adjustments, thus reducing the difficulty of operation.

[0028] (3) The connecting beam of the present invention is provided with a transition groove. The transition groove positions the handle but does not completely limit it. During transportation, due to the positioning effect of the transition groove, the handle will not rotate or shake relative to the connecting beam around the fastener. During installation, the locking component is subjected to the pressure of the column component, and the handle can be disengaged from the transition groove. During the locking process, the transition groove will not limit the protruding head, and will not affect the protruding head being finally limited in the limiting hole.

[0029] (4) When the table frame assembly of the present invention is shipped, the handle is positioned by the transition groove. After the column assembly is installed into the connecting beam, the handle automatically flips up, which can guide the user to lock it. The locking action only requires pressing the wrench in one step, without referring to the installation instructions, and the installation efficiency is high.

[0030] (5) In this invention, the cam push drives the buckle to engage. During the rotation of the handle, the cam rotates under the thrust of the motor box. The front end gradually presses against the plane of the motor box, pushing the buckle assembly and the slot assembly to fit tightly together, ensuring a gapless connection. When the buckle reaches the opening end of the slot assembly, the limiting mechanism automatically pops into the limiting hole to form a mechanical lock, preventing loosening after installation. Moreover, the locking process does not require manual intervention, improving installation efficiency.

[0031] (6) After the column assembly of the present invention is locked, the contact point between the cam and the motor box exceeds the maximum point of the outer diameter of the cam, forming a stable force balance state. This allows the locking assembly to remain locked in the first state by relying on the mechanical structure rather than external force, which can resist vibration or external impact and prevent accidental unlocking. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating one method of locking the column assembly in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the handle in the second state in Embodiment 1 of this application; Figure 3 This is a schematic diagram showing the contact between the bottom of the motor housing and the rear end of the cam in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the buckle assembly moving down to the bottom end of the slot assembly inlet in Embodiment 1 of this application; Figure 5 This is a schematic diagram showing the gradual downward movement of the contact point between the cam and the motor box in Embodiment 1 of this application; Figure 6 This is a schematic diagram of the handle in the first state in Embodiment 1 of this application; Figure 7 This is a schematic diagram of the interference fit between the front end of the cam and the motor box in Embodiment 1 of this application; Figure 8 This is a cross-sectional view of the limiting mechanism in Embodiment 1 of this application; Figure 9 This is a schematic diagram of the card slot assembly structure in Embodiment 1 of this application; Figure 10 This is a schematic diagram of the receiving cavity structure on the cam in Embodiment 1 of this application; Figure 11 This is a schematic diagram of the overall structure of the limiting mechanism in Embodiment 1 of this application; Figure 12 This is a schematic diagram of the second method of locking the column assembly in Embodiment 2 of this application; Figure 13 This is a schematic diagram of the limiting mechanism being pulled out of the limiting hole in Embodiment 2 of this application; Figure 14 This is a schematic diagram showing the continuous thrust generated by the bottom of the motor housing on the rear end of the cam in Embodiment 2 of this application; Figure 15 This is a schematic diagram of the locking component flipping under the drive of the motor box in Embodiment 2 of this application; Figure 16 This is a schematic diagram of the rotating handle driving the motor box in Embodiment 2 of this application; Figure 17 This is a schematic diagram of the limiting mechanism automatically springing into the limiting hole when the handle is in the first state in Embodiment 2 of this application; Figure 18 This is a front view of the interference fit between the locking component and the motor box in Embodiment 2 of this application; Figure 19 This is a schematic diagram of the third method of locking the column assembly in Embodiment 3 of this application; Figure 20 This is a schematic diagram of the second limiting member embedded in the transition groove in Embodiment 3 of this application; Figure 21 This is a schematic diagram of the motor box disengaging the second limiting member from the transition groove in Embodiment 3 of this application; Figure 22 This is a schematic diagram of pressing the handle to transition to the second state in Embodiment 3 of this application; Figure 23 This is a schematic diagram of the second limiting member being embedded in the limiting hole in Embodiment 3 of this application; Figure 24 This is a schematic diagram showing the relative positional relationship between the pressing part and the locking component in Embodiment 3 of this application; Figure 25 This is a schematic diagram of the convex head protruding from the handle in Embodiment 3 of this application; Figure 26 This is a schematic diagram showing the relative positional relationship between the pressing part and the second limiting member in Embodiment 3 of this application; Figure 27 This is a schematic diagram of the fourth method of locking the column assembly in Embodiment 4 of this application; Figure 28 This is a schematic diagram showing the snap-fit ​​component about to engage with the slot component in Embodiment 4 of this application; Figure 29 This is a schematic diagram showing the pressing part located on the outside of the handle in Embodiment 4 of this application; Figure 30 This is a schematic diagram showing the positional relationship between the convex head and the pressing part in Embodiment 4 of this application; Figure 31 This is a schematic diagram of the second spring in Embodiment 4 of this application; Figure 32 This is a schematic diagram of the fifth method of locking the column assembly in Embodiment 4 of this application; Figure 33 This is a schematic diagram showing the relative positional relationship between the sliding part and the handle in Embodiment 5 of this application; Figure 34 This is a schematic diagram showing the locking assembly parallel to the crossbeam in Embodiment 5 of this application; Figure 35 This is a schematic diagram of pressing the handle to make the protruding head spring into the limiting hole in Embodiment 5 of this application; Figure 36 This is a schematic diagram of the sliding part in Embodiment 5 of this application; Figure 37 This is a schematic diagram showing the positional relationship between the sliding part, the third limiting member, and the third spring in Embodiment 5 of this application; Figure 38 This is a schematic diagram showing the positional relationship between the open groove and the protruding pin in Embodiment 5 of this application; Figure 39 These are schematic diagrams illustrating the installation process of the column assembly in embodiments 2 to 5 of this application; Figure 40 This is a schematic diagram of the contact between the open groove and the protruding pin in embodiments 2 to 5 of this application.

[0033] Explanation of the labels in the diagram: Motor box 1; Snap-fit ​​assembly 11, first snap-fit ​​111, second snap-fit ​​112; Plane 12; Column body 2; Connecting beam 3; limiting hole 31; slot assembly 32, first slot 321, second slot 322; transition groove 33; protruding pin 34; Locking assembly 4; cam 41, open groove 410, narrow cavity 411, wide cavity 412; handle 42; Limiting mechanism 5; handle 51a; first limiting member 52a, sliding part 521a, limiting end 522a; first spring 53a; Pressing part 51b, pin 510b; second limiting member 52b, protruding head 520, guide groove 521b; second spring 53b; Sliding part 51c; Third limiting member 52c; Third spring 53c; Fastener 6. Detailed Implementation

[0034] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0035] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. For example, in actual use of an electric height-adjustable desk, the lifting column is located below the desk frame assembly, and the side of the motor box adjacent to the desktop is the top surface; however, in the description of the installation process of the lifting column and desk frame assembly, the desktop assembly is located below, and the top surface of the motor box is considered the bottom.

[0036] Electric height-adjustable desks are increasingly becoming a part of everyday life, their adjustable desktop height effectively meeting the needs of those who spend long hours at a desk and wish to alternate between sitting and standing. According to European standard EN527, the desktop height adjustment range for electric height-adjustable desks is 60-120cm. Some standards specify higher heights, such as the Dutch standard NEN2449, which allows for a range of 62-128cm. When used at its maximum height, the connection between the desk frame and the lifting column must withstand significant force. Typically, more than six screws are needed to secure the frame to the column, but this method requires tools, making assembly difficult and inefficient.

[0037] Example 1 This application discloses a quick-assembly support structure for an electrically adjustable desk, comprising a column assembly, a desk frame assembly detachably connected to the column assembly, and a locking component 4 pre-installed on the desk frame assembly. First, the column assembly is connected to the desk frame assembly. Then, the locking component 4 is used to lock the column assembly onto the desk frame assembly. Simultaneously, the locking component 4 can also release the locked column assembly. Therefore, this support structure enables rapid installation and disassembly of the column assembly and desk frame assembly, effectively improving overall assembly and disassembly efficiency.

[0038] The column assembly includes a lifting column assembly or a fixed column assembly. The lifting column assembly includes a straight column assembly (see Chinese Patent CN212928686U) and an L-shaped column assembly.

[0039] The preferred embodiment of this application is an L-shaped column assembly in a lifting column assembly, which includes a column body 2 and a motor box 1. The motor box 1 is located at the end of the column body 2 and is fixedly connected to the column body 2. Preferably, the cross-sectional area of ​​the motor box 1 is larger than the cross-sectional area of ​​the column body 2.

[0040] The table frame assembly includes at least one pair of connecting beams 3, which are arranged in parallel, and the column assembly and locking assembly 4 are both located between the pair of connecting beams 3.

[0041] In terms of structural design, the motor box 1 and the connecting beam 3 are detachably connected, preferably using a snap-fit ​​connection. Complementary connecting components are provided on opposite sides: when the snap-fit ​​component 11 is integrated into the side of the motor box 1, a matching slot component 32 is configured at a corresponding position on the inner side of the connecting beam 3; conversely, the snap-fit ​​component 11 can also be installed on the inner side of the connecting beam 3, with the slot component 32 located on the side of the motor box 1. Both layouts achieve a stable snap-fit ​​connection, meeting flexible assembly requirements.

[0042] It is worth noting that when a straight column assembly is used, the snap-fit ​​assembly 11 is installed on the outer wall of the column body 2 pipe fitting.

[0043] The connecting beam 3 is detachably connected to the column assembly. During installation, the table frame assembly is first placed horizontally on a stable plane to ensure a level installation reference. Then, the pre-positioning connection between the column assembly and the table frame assembly is completed through the engagement of the snap-fit ​​assembly 11 and the slot assembly 32. This design effectively improves initial assembly efficiency and ensures structural alignment accuracy. After pre-connection, the locking assembly 4 is used to lock the column assembly, reliably fixing it between the pair of connecting beams 3, forming a complete and stable frame structure.

[0044] More specifically, along the length of the connecting beam 3, the latching assembly 11 includes a first latch 111 and a second latch 112, wherein the first latch 111 is relatively far from the locking assembly 4, forming a double-support fixing structure with the second latch 112. In terms of specific implementation, the first latch 111 and the second latch 112 can adopt a stamping protrusion forming scheme. This process eliminates the gap between the latching assembly 11 and the column assembly through integrated molding; alternatively, a split component assembly scheme can be adopted, for example, using high-strength pins or customized metal protrusions as latching units.

[0045] Along the length of the connecting beam 3, the slot assembly 32 includes a first slot 321 adapted to the first buckle 111 and a second slot 322 adapted to the second buckle 112. The slot assembly 32 can be installed in two ways: direct molding and gasket assembly. The direct molding method involves directly machining the slot structure into the inner wall of the connecting beam 3, which reduces the number of parts and improves assembly efficiency. The gasket assembly method involves fixing customized gaskets to the inner side of the connecting beam 3 using countersunk screws, structural adhesive, or welding, with the slot assembly 32 placed on top of the gaskets. This method facilitates later maintenance and replacement, and allows for quick product selection by replacing gaskets of different specifications. During assembly, the first buckle 111 on the motor box 1 is first moved towards the first slot 321, and simultaneously, the second buckle 112 is moved towards the second slot 322.

[0046] It is worth noting that the first slot 321 and the second slot 322 can be a single slot, a double slot, or a multi-slot slot. The shapes of the first slot 321 and the second slot 322 can be different, as long as they can achieve the engagement of the latching assembly 11 and the slot assembly 32. In this embodiment, the slot assembly 32 is generally L-shaped, including a horizontal fitting portion and a vertical guide portion, with the fitting portion gradually narrowing towards its open end. When the latching assembly 11 is inserted into the slot assembly 32, the gradually narrowing structure of the fitting portion towards its open end results in a progressively tight fit between the two. This tight fit significantly increases the friction and mechanical interlocking force between the connection interfaces, forming a more robust mechanical interlocking structure, thereby enhancing the reliability of the connection.

[0047] In addition, along the length of the connecting beam 3, the length of the guide section of the slot assembly 32 is greater than the length of the buckle assembly 11, which can provide a larger guiding space for the assembly of the motor box 1. The longer guide section provides ample tolerance space for the initial docking of the buckle and the slot, so that the assembler does not need to align precisely during operation, thus reducing the assembly accuracy requirements.

[0048] The locking assembly 4 is pre-mounted on the connecting beam 3 via fastener 6, and the locking assembly 4 can rotate about the fastener 6 as the center of rotation. The fastener 6 is preferably a pin 510b or a bolt assembly.

[0049] More specifically, the locking assembly 4 includes a cam 41 and a handle 42 connected to the cam 41. The two are preferably integrally formed. The handle 42 is easy for the operator to grip. When the operator applies a rotational force to it, the cam 41 can be driven to rotate around the fastener 6, thereby realizing the predetermined function of the locking assembly 4.

[0050] The front end face of cam 41 is an arc-shaped curved surface that bulges towards the column assembly. When the operator applies force to handle 42 and the handle 42 reaches the first state, the arc-shaped curved surface of the front end face of cam 41 tightly abuts against the motor box 1. Based on the special geometric design of the arc-shaped curved surface of cam 41, an interference fit is formed between the two, thereby generating sufficient friction to firmly lock the column assembly onto the connecting beam 3. In this state, the locking assembly 4 as a whole remains relatively static and stable on the connecting beam 3, effectively preventing the column assembly from shifting or loosening.

[0051] In this embodiment, when the handle 42 is in the first state, the front part of the handle 42, i.e. the part held by the operator, is located above the motor box 1. When the handle 42 rotates from the second state to the first state, the upper surface of the motor box 1 can block the front part of the handle 42, restricting the handle 42 from continuing to rotate around the fastener 6, effectively preventing locking failure caused by excessive rotation of the handle 42.

[0052] The operator applies reverse force to the handle 42, causing the cam 41 to rotate in the opposite direction around the fastener 6, releasing the tight compression between the front end of the cam 41 and the motor box 1. The handle 42 reaches the second state, the locking component 4 is in a relatively free state, the interference fit is released, and the locking of the column component is released, so that the column component can move or be adjusted relative to the connecting beam 3.

[0053] More specifically, the motor housing 1 includes a plane 12 that mates with the cam 41, and the plane 12 and the arcuate surface of the cam 41 form line contact or surface contact. It is worth noting that as the handle 42 rotates from the second state to the first state, the arcuate surface of the cam 41 causes the pressure on the plane 12 to gradually increase.

[0054] To achieve an interference fit, in this embodiment, the plane 12 is preferably an inclined plane, with the inclined plane forming an acute angle with the bottom surface of the motor housing 1. When the handle 42 drives the cam 41 to rotate from the second state to the first state, the contact point between the cam 41 and the inclined plane 12 gradually moves down along the inclined plane. During this process, the clamping force between the two increases due to the wedge-shaped force amplification effect of the inclined plane, enabling efficient locking through a small rotation angle.

[0055] It is worth noting that, with the rotation center axis of the locking assembly 4 as a reference, a normal A perpendicular to plane 12 is constructed, which intersects plane 12 at point O. During operation, the rotating handle 42 is driven to transition from the second state to the first state. During this movement, the contact point between the front end face of the cam 41 and plane 12 changes position. When this contact point crosses point O, based on the over-dead-point self-locking principle of the cam 41, the cam 41 remains stationary with respect to plane 12 when the locking assembly 4 reaches the first state.

[0056] At this point, the system forms a stable force balance state, which enables the locking component 4 to remain relatively stable in the first state. In terms of anti-loosening performance, an external force needs to be applied to make the cam 41 rotate in the unlocking direction and pass point O in order to unlock. In actual use, the force that may cause the cam 41 to disengage on its own due to factors such as vibration and gravity is usually less than the critical force required to make the cam 41 move in the opposite direction and pass point O. Therefore, the structural characteristics of the cam 41 can effectively prevent accidental unlocking caused by external disturbances and ensure the reliability and stability of the locking component 4.

[0057] To further improve the stability and reliability of the locking assembly 4 in the first state, a limiting mechanism 5 is added to the locking assembly 4. A receiving cavity is provided for the limiting mechanism 5 to pass through, and a limiting hole 31 is correspondingly provided on the connecting beam 3 for the limiting mechanism 5 to pass through. One side of the limiting mechanism 5 is designed as a limiting end that can slide within the receiving cavity.

[0058] The limiting end of the limiting mechanism 5 passes through the receiving cavity and can selectively insert into the limiting hole 31. When the limiting mechanism 5 is inserted into the limiting hole 31, it restricts the rotational freedom of the rotating handle 42, thereby preventing the cam 41 on the handle 42 from rotating. Based on this, even when subjected to external shocks, vibrations, or other disturbances, the locking assembly 4 can still be stably maintained in the first state due to the mechanical limiting effect of the limiting mechanism 5, effectively preventing accidental unlocking and significantly improving the safety and stability of the entire locking system.

[0059] More specifically, the limiting mechanism 5 includes an operating part, a limiting part, and an elastic component.

[0060] Under external force, the operating part can move relative to the locking assembly 4. When the operating part moves relative to the locking assembly 4, it can drive the limiting part to be pulled out or inserted into the limiting hole 31. The operating part is movably connected to the locking assembly 4 through an elastic member. It is worth noting that when the column assembly is locked, the elastic member is in a natural or pre-compressed state.

[0061] In this embodiment, the operating part includes a handle 51a, the limiting part includes a first limiting member 52a, and the elastic member includes a first spring 53a. The handle 51a is convenient for the operator to pull, and the handle 51a is opposite to the side of the handle 42. One end of the first limiting member 52a is connected to the handle 51a and extends axially. One end of the first spring 53a abuts against the receiving cavity, and the other end is fixedly connected to the end of the first limiting member 52a away from the handle 51a.

[0062] The receiving cavity includes a narrow cavity 411 and a wide cavity 412. The inner diameter of the wide cavity 412 is larger than the inner diameter of the narrow cavity 411. The narrow cavity 411 is opposite to the handle 51a, and the outer diameter of the handle 51a is larger than the outer diameter of the narrow cavity 411.

[0063] The first limiting member 52a includes a sliding portion 521a and a limiting end 522a, the outer diameter of which is larger than the outer diameter of the sliding portion 521a. One end of the sliding portion 521a is fixedly connected to the handle 51a. Notably, the outer diameter of the sliding portion 521a is adapted to the inner diameter of the narrow cavity 411 to form a sliding fit. The limiting end 522a is fixedly connected to the end of the sliding portion 521a away from the handle 51a, and the outer diameter of the limiting end 522a is adapted to the inner diameter of the wide cavity 412, and also to the inner diameter of the limiting hole 31.

[0064] The first spring 53a is sleeved on the outer wall of the sliding part 521a, with one end of the first spring 53a abutting against the bottom end of the wide cavity 412 and the other end fixedly connected to the limiting end 522a. When the limiting end 522a is located in the limiting hole 31, the bottom of the handle 51a abuts against the side of the handle 42, and the first spring 53a is in a natural or pre-compressed state.

[0065] When it is necessary to release the lock, the operator applies an axial pulling force to the handle 51a. This pulling force is transmitted to the first spring 53a through the first limiting member 52a, causing it to undergo elastic compression deformation. Under the compression action of the first spring 53a, the sliding part 521a, together with the limiting end 522a, moves linearly along the axial direction of the receiving cavity until the limiting end 522a completely disengages from the limiting hole 31 of the connecting beam 3. At this time, the rotational freedom of the handle 42 is released, and the unlocking operation can be performed.

[0066] The limiting mechanism 5, through the pre-tightening force design of the first spring 53a, ensures that after the first limiting member 52a is inserted into the limiting hole 31, the handle 51a and the side of the handle 42 form an interference fit, which can effectively prevent loosening caused by vibration or impact.

[0067] It is worth noting that in this embodiment, the cam 41 has a certain length. When preparing to install the table frame structure, first pull the limiting mechanism 5 out of the limiting hole 31, flip the handle 42 so that the cam 41 is closer to the motor box 1 and the handle 42 is away from the motor box 1. The entire locking assembly 4 is roughly parallel to the connecting beam 3.

[0068] Next, align the buckle assembly 11 on the motor box 1 with the slot assembly 32 on the connecting beam 3.

[0069] The detailed process is as follows: (1) When the second latch 112 approaches the second slot 322, the bottom of the motor box 1 first contacts the top of the cam 41 (see Figure 3 ); (2) As the latch assembly 11 continues to move downward along the guide portion of the slot assembly 32, the bottom of the motor housing 1 generates a continuous thrust on the cam 41. This thrust drives the front end of the cam 41, together with the handle 42 linked to it, to rotate counterclockwise around the fastener 6 (see...). Figure 4 ), and simultaneously move closer to plane 12 of motor box 1; (3) When the buckle assembly 11 reaches the bottom of the guide part of the slot assembly 32, the locking assembly 4 is in a roughly upright state, the front end of the cam 41 abuts against the plane 12, and the abutment point is located above the plane 12. (4) Continue to rotate the handle 42 counterclockwise, causing the front end of the cam 41 to gradually move down to the contact point with the motor box 1, thereby pushing the buckle assembly 11 and the slot assembly 32 to engage with each other; when the maximum outer diameter of the cam 41 crosses point O, the cam 41 continues to rotate counterclockwise by about 2°~8°, and the buckle assembly 11 reaches the opening end of the slot assembly 32 after being engaged. At this time, the limiting end 522a on the limiting mechanism 5 automatically springs into the limiting hole 31 on the connecting beam 3.

[0070] (5) It is worth noting that the point of maximum radius of cam 41, i.e. point P, is located below the normal A, forming a stable force balance state, so that the locking assembly 4 can remain relatively stable in the first state.

[0071] Example 2 This embodiment is based on embodiment 1, but proposes another design structure for the locking component 4. The buckle component 11, the slot component 32, the limiting mechanism 5, the connecting beam 3 and the limiting hole 31 on it adopt the same design scheme as in embodiment 1.

[0072] In this embodiment, the handle 42 and the cam 41 are basically on the same plane. It is worth noting that in this embodiment, the cam 41 also has a certain length. When preparing to install the table frame structure, first pull the limiting mechanism 5 out of the limiting hole 31, flip the handle 42 so that the rear end of the cam 41 is closer to the motor box 1, and the handle 42 is away from the motor box 1. The entire locking assembly 4 is roughly parallel to the connecting beam 3.

[0073] Next, align the buckle assembly 11 on the motor box 1 with the slot assembly 32 on the connecting beam 3.

[0074] The detailed process is as follows: (1) When the second latch 112 approaches the second slot 322, the bottom of the motor box 1 first contacts the top of the cam 41 (see Figure 14 ); (2) As the latch assembly 11 continues to move downward along the guide portion of the slot assembly 32, the bottom of the motor housing 1 generates a continuous thrust on the cam 41. This thrust drives the front end of the cam 41, together with the handle 42 linked to it, to rotate clockwise around the fastener 6 (see...). Figure 15 ); (3) When the buckle assembly 11 reaches the bottom of the guide part of the slot assembly 32, the locking assembly 4 is in a roughly upright state, the front end of the cam 41 abuts against the plane 12, and the abutment point is located below the plane 12. (4) Rotate the handle 42 counterclockwise (see Figure 16 The front end of the cam 41 gradually moves upward to the contact point between itself and the motor box 1, thereby pushing the buckle assembly 11 to the left so that it is interlocked with the slot assembly 32 in the fitting part (top view); when the maximum point of the outer diameter of the cam 41 crosses point O, and the cam 41 continues to rotate counterclockwise by about 2°~8°, the buckle assembly 11 reaches the opening end of the fitting part of the slot assembly 32, at which time the limiting end 522a on the limiting mechanism 5 automatically springs into the limiting hole 31 on the connecting beam 3.

[0075] It is worth noting that the point of maximum radius of cam 41, i.e. point P, is located above the normal A, forming a stable force balance state, which enables the locking assembly 4 to remain relatively stable in the first state.

[0076] More preferably, in this embodiment, during the locking process, the rotation direction of the handle 42 is opposite to that of Embodiment 1, and the contact point between the cam 41 and the inclined plane 12 gradually moves upward along the inclined plane.

[0077] Example 3 This embodiment is based on embodiment 2, and proposes another design structure for the limiting mechanism 5. The buckle assembly 11, the slot assembly 32, the locking assembly 4, the connecting beam 3 and the limiting hole 31 on it adopt the same design scheme as in embodiment 2.

[0078] The limiting mechanism 5 includes an operating part, a limiting part, and an elastic component.

[0079] Under the action of external force, the operating part can move relative to the locking component 4. When the operating part moves relative to the locking component 4, it can drive the limiting part to be pulled out or inserted into the limiting hole 31. The operating part is movably connected to the locking component 4 through the elastic member. When the column assembly is locked, the elastic member is in the natural state or the pre-compressed state.

[0080] In this embodiment, the handle 42 is provided with a receiving cavity for accommodating the limiting mechanism 5. The operating part includes a pressing part 51b, which protrudes from the inside of the handle 42. That is, when the column assembly is locked, the pressing part 51b is located on the side of the handle 42 that is relatively close to the motor box 1.

[0081] More preferably, the surface of the pressing part 51b is provided with concave and convex parts that conform to the contour of the fingers, which further improves the comfort of hand grip and the convenience of force application during operation by conforming to the arc of the fingers.

[0082] The limiting part includes a second limiting member 52b, which is slidably connected to the pressing part 51b; the elastic component includes a second spring 53b, one end of which abuts against the locking assembly 4, and the other end of which abuts against the pressing part 51b. The pressing part 51b is provided with a pin 510b, and the second limiting member 52b is provided with a guide groove 521b for sliding the pin 510b. The guide groove 521b is inclined and closed at both ends, and its inclination angle is set according to the matching requirements of the pressing stroke and the axial displacement of the limiting member.

[0083] When the pressing part 51b moves relative to the locking assembly 4, the pin 510b slides along the inclined guide groove 521b. The radial movement of the pressing part 51b is converted into the axial driving force of the second limiting member 52b by means of the inclined trajectory of the guide groove 521b. This drives the second limiting member 52b to move precisely along the axial direction of the fastener 6, so as to realize the action of inserting into the limiting hole 31 or separating from the limiting hole 31.

[0084] More specifically, when the column assembly is locked, the second spring 53b is in its natural or pre-compressed state, providing stable support to the pressing part 51b through its own elastic force, thus maintaining the initial posture of the pressing part 51b protruding from the surface of the locking assembly 4 without external force. Simultaneously, in this locked state, the pin 510b is precisely engaged at the closed end of the guide groove 521b, and the second limiting member 52b is fully embedded in the limiting hole 31, forming a reliable mechanical lock.

[0085] Under the action of external force, the pressing part 51b is subjected to extrusion force, the second spring 53b is compressed and stores elastic potential energy, and the pin 510b slides from the first end to the last end along the inclined path of the guide groove 521b. It is worth noting that, since the second limiting member 52b is limited by the installation limit, it can only move along the axial direction of the fastener 6. Therefore, when the pin 510b moves to the closed end of the guide groove 521b, the second limiting member 52b just completely exits the limiting hole 31, realizing the unlocking of the column assembly. At this time, the compressed state of the spring provides the power basis for subsequent reset.

[0086] The connecting beam 3 is provided with a transition groove 33. The end of the second limiting member 52b away from the operating part is provided with a protruding head 520. The protruding head 520 is roughly conical and gradually narrows towards the transition groove 33. That is, the conical structure of the protruding head 520 narrows from the end connected to the main body of the second limiting member 52b towards the transition groove 33.

[0087] Along the height direction of the column body 2, the size of the conical flared end of the protruding head 520 (i.e. the larger end that is connected to the main body of the second limiting member 52b) is larger than the opening size of the transition groove 33, forming an anti-over-embedding positioning structure.

[0088] When the second limiting member 52b engages with the transition groove 33, only the tapered tapered portion of the protruding head 520 is embedded in the transition groove 33. Due to size limitations, the tapered flared end is always located outside the transition groove 33. At this time, the two form a structure that is positioned but not completely limited.

[0089] In this latching state, the contact point between cam 41 and plane 12 has not passed the maximum point of the cam's outer diameter, which means that cam 41 has not yet rotated to the limit locking position, and the column assembly is in an adjustable state. When the second limiting member 52b is inserted into the limiting hole 31, the convex head 520 is fully embedded in the limiting hole 31, and its conical flared end fits against the inner wall of the limiting hole 31 to achieve a stable lock. At the same time, the contact point between the cam 41 and the plane 12 exceeds the maximum point of the outer diameter of the cam 41, and the self-locking characteristic of the cam structure locks the column assembly in the current position, ensuring connection strength and stability.

[0090] In this embodiment, the handle 42 and cam 41 are constructed in a manner similar to those in embodiment 2 and are essentially on the same plane. When preparing to install the table frame structure, the second limiting member 52b and the transition groove 33 are in a snap-fit ​​state, and the snap-fit ​​assembly 11 on the motor box 1 is aligned with the snap-fit ​​assembly 32 on the connecting beam 3.

[0091] The detailed process is as follows: (1) When the second latch 112 approaches the second slot 322, the bottom of the motor box 1 first contacts the top of the cam 41 (see Figure 21 And under the gravity of the motor box 1, the second limiting member 52b is disengaged from the transition groove 33; (2) As the latch assembly 11 continues to move downward along the guide portion of the slot assembly 32, the bottom of the motor housing 1 generates a continuous thrust on the cam 41. This thrust drives the cam 41, together with the handle 42 linked to it, to rotate counterclockwise around the fastener 6 (see...). Figure 21 , Figure 22 ); (3) When the buckle assembly 11 reaches the bottom of the guide part of the slot assembly 32, the locking assembly 4 is in a roughly upright state, the front end of the cam 41 abuts against the plane 12, and the abutment point is located below the plane 12. (4) Press the handle 42 clockwise (see Figure 23 The front end of the cam 41 gradually moves upward to the contact point between itself and the motor box 1, thereby pushing the buckle assembly 11 to the left so that it is interlocked with the slot assembly 32 in the fitting part (top view); when the maximum point of the outer diameter of the cam 41 passes point O, and the cam 41 continues to rotate clockwise by about 2°~8°, the buckle assembly 11 reaches the opening end of the fitting part of the slot assembly 32, at which time the protruding head 520 automatically springs into the limiting hole 31 on the connecting beam 3.

[0092] It is worth noting that the point of maximum radius of cam 41, i.e. point P, is located above the normal A, forming a stable force balance state, which enables the locking assembly 4 to remain relatively stable in the first state.

[0093] Example 4 The difference between this embodiment and embodiment 3 is that the pressing part 51b protrudes from the outside of the handle 42. That is, when the column assembly is locked, the pressing part 51b is located on the side of the handle 42 that is relatively far away from the motor box 1. Therefore, the inclination direction of the guide groove 521b is opposite to that of embodiment 3.

[0094] The limiting part includes a second limiting member 52b, which is slidably connected to the pressing part 51b; the elastic component includes a second spring 53b, one end of which abuts against the locking assembly 4, and the other end of which abuts against the pressing part 51b. The pressing part 51b is provided with a pin 510b, and the second limiting member 52b is provided with a guide groove 521b for sliding the pin 510b. The guide groove 521b is inclined and closed at both ends, and its inclination angle is set according to the matching requirements of the pressing stroke and the axial displacement of the limiting member.

[0095] When the pressing part 51b moves relative to the locking assembly 4, the pin 510b slides along the inclined guide groove 521b. The radial movement of the pressing part 51b is converted into the axial driving force of the second limiting member 52b by means of the inclined trajectory of the guide groove 521b. This drives the second limiting member 52b to move precisely along the axial direction of the fastener 6, so as to realize the action of inserting into the limiting hole 31 or separating from the limiting hole 31.

[0096] More specifically, when the column assembly is locked, the second spring 53b is in its natural or pre-compressed state, providing stable support to the pressing part 51b through its own elastic force, thus maintaining the initial posture of the pressing part 51b protruding from the surface of the locking assembly 4 without external force. Simultaneously, in this locked state, the pin 510b is precisely engaged at the closed end of the guide groove 521b, and the second limiting member 52b is fully embedded in the limiting hole 31, forming a reliable mechanical lock.

[0097] Under the action of external force, the pressing part 51b is subjected to extrusion force, the second spring 53b is compressed and stores elastic potential energy, and the pin 510b slides from the first end to the last end along the inclined path of the guide groove 521b. It is worth noting that, since the second limiting member 52b is limited by the installation limit, it can only move along the axial direction of the fastener 6. Therefore, when the pin 510b moves to the closed end of the guide groove 521b, the second limiting member 52b just completely exits the limiting hole 31, realizing the unlocking of the column assembly. At this time, the compressed state of the spring provides the power basis for subsequent reset.

[0098] The connecting beam 3 is provided with a transition groove 33. The end of the second limiting member 52b away from the operating part is provided with a protruding head 520. The protruding head 520 is roughly conical and gradually narrows towards the transition groove 33. That is, the conical structure of the protruding head 520 narrows from the end connected to the main body of the second limiting member 52b towards the transition groove 33.

[0099] Along the height direction of the column body 2, the size of the conical flared end of the protruding head 520 (i.e. the larger end that is connected to the main body of the second limiting member 52b) is larger than the opening size of the transition groove 33, forming an anti-over-embedding positioning structure.

[0100] When the second limiting member 52b engages with the transition groove 33, only the tapered tapered portion of the protruding head 520 is embedded in the transition groove 33, while the tapered flared end remains outside the transition groove 33 due to size limitations. At this time, the two form a structure that is positioned but not fully limited. In this latching state, the contact point between cam 41 and plane 12 has not passed the maximum point of the cam's outer diameter, which means that cam 41 has not yet rotated to the limit locking position, and the column assembly is in an adjustable state. When the second limiting member 52b is inserted into the limiting hole 31, the convex head 520 is fully embedded in the limiting hole 31, and its conical flared end fits against the inner wall of the limiting hole 31 to achieve a stable lock. At the same time, the contact point between the cam 41 and the plane 12 exceeds the maximum point of the outer diameter of the cam 41, and the self-locking characteristic of the cam structure locks the column assembly in the current position, ensuring connection strength and stability.

[0101] It is worth noting that the number of limiting holes 31 and transition grooves 33 can be flexibly adjusted according to the assembly requirements of the table frame structure. A single limiting hole 31 and a single transition groove 33 can be provided on the same connecting beam 3 to meet the locking and transition positioning requirements of the foundation.

[0102] A symmetrical arrangement can also be adopted, that is, each has two limiting holes 31 and two transition grooves 33, and each connecting beam 3 is equipped with a corresponding limiting hole 31 and a transition groove 33. The locking stability and force balance are improved through the double-sided synchronous structural design.

[0103] In accordance with the symmetrical arrangement, the second limiting member 52b, the pin 510b and the guide groove 521b are also arranged in two groups. Each group of components cooperates with the corresponding limiting hole 31 and transition groove 33 to achieve symmetrical locking or unlocking, further enhancing the structural reliability of the table frame after assembly.

[0104] Since the internal cavity of the locking assembly 4 forms a circumferential limit on the pressing part 51b, the pressing part 51b can only make axial linear movement along its own axis during the activity, which effectively limits the radial offset or rotation of the pressing part 51b, ensuring that it can stably transmit the driving force to the limiting part 52 when it is subjected to force, and ensuring the accuracy and reliability of the locking or unlocking action.

[0105] The handle 42 and cam 41 in this embodiment are roughly the same as those in embodiments 2 and 3, and are basically on the same plane. When preparing to install the table frame structure, the second limiting member 52b and the transition groove 33 are in a snap-fit ​​state, and the buckle assembly 11 on the motor box 1 is aligned with the buckle assembly 32 on the connecting beam 3.

[0106] The detailed process is as follows: (1) When the second latch 112 approaches the second slot 322, the bottom of the motor box 1 first contacts the top of the cam 41 (see Figure 29 And under the gravity of the motor box 1, the second limiting member 52b is disengaged from the transition groove 33; (2) As the latch assembly 11 continues to move downward along the guide portion of the slot assembly 32, the bottom of the motor housing 1 generates a continuous thrust on the cam 41. This thrust drives the cam 41, together with the handle 42 linked to it, to rotate counterclockwise around the fastener 6 (see...). Figure 29 ); (3) When the buckle assembly 11 reaches the bottom of the guide part of the slot assembly 32, the locking assembly 4 is in a roughly upright state, the front end of the cam 41 abuts against the plane 12, and the abutment point is located below the plane 12. (4) Press the handle 42 clockwise (see Figure 30 The front end of the cam 41 gradually moves upward to the contact point between itself and the motor box 1, thereby pushing the buckle assembly 11 to the left so that it is interlocked with the slot assembly 32 in the fitting part (top view); when the maximum point of the outer diameter of the cam 41 passes point O, and the cam 41 continues to rotate clockwise by about 2°~8°, the buckle assembly 11 reaches the opening end of the fitting part of the slot assembly 32, at which time the protruding head 520 automatically springs into the limiting hole 31 on the connecting beam 3.

[0107] Example 5 This embodiment differs slightly from embodiments 2 or 3 in that the operating part includes a sliding part 51c, and the limiting part includes a third limiting member 52c. The third limiting member 52c and the sliding part 51c are fixedly connected (such as by welding or integral molding) to ensure that the two move synchronously. The elastic component includes a third spring 53c. One end of the third spring 53c abuts against the locking component 4, and the other end abuts against the third limiting member 52c. The spring force provides a reset power for the third limiting member 52c.

[0108] When the sliding part 51c slides along the preset trajectory, it will directly drive the third limiting member 52c to move linearly along the axis of the third spring 53c, thereby enabling the third limiting member 52c to be inserted into the limiting hole 31 to lock, or to be removed from the limiting hole 31 to unlock. The whole process ensures the smoothness and stability of the limiting state switching through the cooperation of sliding action and spring force.

[0109] The third limiting member 52c also has a protruding head 520 at the end away from the third spring 53c, and a corresponding transition groove 33 is provided on the connecting beam 3. The matching relationship between the two is the same as that in embodiment 3 or embodiment 4, and will not be described again here.

[0110] It should be noted that, in Embodiments 1 and 2, as a design approach, a transition groove 33 can also be added to the connecting beam 3. When the transition groove 33 and the limiting hole 31 are located on the same side of the fastener 6, the transition groove 33 is set at the middle position when the handle 42 rotates from the first state to the second state.

[0111] Of course, the transition groove 33 and the limiting hole 31 can also be located on opposite sides of the fastener 6. For example, the handle 42 has an elastic rod (not shown in the figure) on the side opposite to the connecting beam 3 that cooperates with the transition groove 33. Figure 2 and Figure 13 Similar to the snap-fit ​​relationship between the second limiting member 52b, the third limiting member 52c, and the transition groove 33, the elastic rod is also roughly conical. When snapped in, it forms a preliminary positioning but not fully locked transition state with the connecting beam 3. This transition state can prevent the locking component 4 from flipping back and forth during transportation, and only a small external force is needed to release the preliminary positioning relationship, making operation convenient.

[0112] In this embodiment, the connecting beam 3 is provided with at least one protruding pin 34. When the cam 41 is flipped, the back side of the cam 41 (i.e. the side that is relatively far away from the motor box 1) will abut against the protruding pin 34. At this time, the protruding pin 34 can effectively block the cam 41, thereby limiting the cam 41 from over-flipping.

[0113] When the handle 42 rotates from the second state to the first state, the lower end face of the locking component 4 presses against the protruding pin 34, and the limiting part automatically springs into the limiting hole 31.

[0114] If the handle 42 is pressed too quickly or the elastic component fails, the limiting part may not be able to spring into the limiting hole 31 in time, causing the maximum travel of the outer diameter of the cam 41 to exceed point O. The protruding pin 34 can prevent the locking failure caused by this. Furthermore, an open groove 410 can be further opened at the bottom of the cam 41, and the contour of the open groove 410 is adapted to the outer periphery of the protruding pin 34.

[0115] like Figure 39 As shown, with the rotation center of the locking assembly 4 (i.e. the center point of the fastener 6) as the center, draw a line segment perpendicular to the upper surface of the locking assembly 4 with the center of the circle, and then draw a circle with the length of the line segment as the radius and the center point of the fastener 6 as the center; the distance between the maximum outer diameter point of the cam 41 (i.e., point P) and the outer circumference of the circle is a. It is worth noting that the extension line of a passes through the rotation center of the locking assembly 4.

[0116] When the handle 42 moves from the second state to the first state, the horizontal movement distance of the column assembly (i.e., the latch assembly 11) is b, and the two must satisfy the matching relationship that a is greater than b. This allows the locking assembly 4 to form a stable self-locking structure when it reaches the first state, thanks to the self-locking principle of the cam 41 over dead point after the maximum point of the outer diameter of the cam 41 passes point O.

[0117] At this time, the cam 41 is tightly fitted with the plane 12 of the motor box 1 and remains relatively stationary, and will not be displaced due to external disturbance. This design not only provides sufficient space for the movement of the motor box 1 to avoid interference between components, but also enhances the reliability of the locking state through the mechanical self-locking characteristic, ensuring that the motor box 1 is stably fixed in the mating position, effectively preventing loosening or accidental disengagement after assembly.

[0118] In addition, such as Figure 40 As shown, the buckle assembly 11 falls into the slot assembly 32 from top to bottom, and the front end of the cam 41 is tangent to the plane 12. In this state, the horizontal distance between the edge of the second slot 322 that is relatively close to the first slot 321 and the point of tangency is c; the maximum horizontal distance between the end of the second buckle 112 that is relatively far from the plane 12 and the plane 12 is d. The two must satisfy the matching relationship that c is greater than d.

[0119] This dimensional setting is crucial during the assembly of the column assembly. Because c is greater than d, when the second latch 112 approaches and engages with the guide portion of the second slot 322, the second latch 112 will not interfere with the front end face of the cam 41, providing ample space for alignment and engagement. This design effectively reduces the precision requirements during assembly, thereby improving assembly efficiency, while avoiding wear or assembly jamming caused by component collisions.

[0120] The handle 42 and cam 41 in this embodiment are roughly the same as those in embodiments 2, 3 and 4. When preparing to install the table frame structure, the third limiting member 52c and the transition groove 33 are in a snap-fit ​​state, and the snap-fit ​​assembly 11 on the motor box 1 is aligned with the snap-fit ​​assembly 32 on the connecting beam 3.

[0121] The specific installation process is as follows: (1) When the second latch 112 approaches the second slot 322, the bottom of the motor box 1 first contacts the top of the cam 41 (see Figure 33 And under the gravity of the motor box 1, the third limiting member 52c is disengaged from the transition groove 33; (2) As the latch assembly 11 continues to move downward along the guide portion of the slot assembly 32, the bottom of the motor housing 1 generates a continuous thrust on the cam 41. This thrust drives the cam 41, together with the handle 42 linked to it, to rotate counterclockwise around the fastener 6 (see...). Figure 33 ); (3) When the buckle assembly 11 reaches the bottom of the guide part of the slot assembly 32, the locking assembly 4 is in a roughly upright state, the front end of the cam 41 abuts against the plane 12, and the abutment point is located below the plane 12. (4) Press handle 42 (see Figure 34 The front end of the cam 41 gradually moves upward to the contact point between itself and the motor box 1, thereby pushing the buckle assembly 11 so that it is interlocked with the slot assembly 32 in the fitting part. When the maximum point of the outer diameter of the cam 41 passes point O and the cam 41 continues to rotate clockwise by about 2°~8°, the buckle assembly 11 reaches the opening end of the fitting part of the slot assembly 32. At this time, the protruding head 520 automatically springs into the limiting hole 31 on the connecting beam 3.

[0122] Example 6 When it is necessary to disassemble the table frame structure, the disassembly steps are as follows: T1: Operate the limiting part to move it completely out of the limiting hole 31 on the connecting beam 3, thereby releasing the rotational constraint on the cam 41 and ensuring that the locking assembly 4 can rotate freely; T2: Rotate handle 42 in the opposite direction to drive cam 41 to rotate synchronously until the contact point between the end face of cam 41 and motor box 1 crosses point O in the opposite direction. At this time, the locking state between cam 41 and motor box 1 is released and the cam is disengaged. T3: After the cam 41 is completely separated from the motor box 1, the column assembly is moved out in the opposite direction along the assembly direction of the connecting beam 3 to complete the disassembly of the table frame structure.

[0123] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A quick-assembly table frame structure, comprising: Column assembly; Connecting beam (3), which is detachably connected to the column assembly; Its features are: It also includes, Locking assembly (4), which is pre-mounted on the connecting beam (3) by fastener (6) and is rotatable about the fastener (6); The locking assembly (4) includes a cam (41) and a handle (42) connected to the cam (41), the handle (42) being used to drive the cam (41) to rotate around the fastener (6); When the handle (42) is in the first state, the cam (41) abuts against the column assembly, and the column assembly is locked to the connecting beam (3). When the handle (42) is in the second state, the cam (41) is disengaged from the column assembly, and the column assembly is unlocked.

2. The table frame structure for rapid assembly according to claim 1, characterized in that: The column assembly includes a motor box (1) and a column body (2) connected to the motor box (1). The motor box (1) is detachably connected to the connecting beam (3), and the motor box (1) includes a plane (12) for abutting against the cam (41).

3. The table frame structure for rapid assembly according to claim 2, characterized in that: The end of the cam (41) is a variable diameter arc, and the point where the outer diameter of the cam (41) is the largest is point P; During the rotation of the handle (42) from the second state to the first state, the contact point between the cam (41) and the plane (12) moves toward point P; the radius between the contact point and the fastener (6) gradually increases; When the handle (42) is in the first state, the contact point between the cam (41) and the plane (12) crosses point P, and the radius between the contact point and the fastener (6) is smaller than the radius between point P and the fastener (6).

4. The table frame structure for rapid assembly according to claim 3, characterized in that: Draw a normal line A through the center of the fastener (6) that is perpendicular to the plane (12), and the intersection point of the normal line A and the plane (12) is O; During the rotation of the handle (42) from the second state to the first state, point P crosses point O.

5. The table frame structure for rapid assembly according to claim 2, characterized in that: The locking assembly (4) is provided with a limiting mechanism (5), and the limiting mechanism (5) is movably connected to the locking assembly (4); the connecting beam (3) is provided with a limiting hole (31) that is adapted to the limiting mechanism (5). At least one end of the limiting mechanism (5) can extend out of the locking component (4) and can be selectively inserted into the limiting hole (31); When the limiting mechanism (5) is inserted into the limiting hole (31), the limiting mechanism (5) is used to limit the rotation of the cam (41) to lock the column assembly.

6. The table frame structure for rapid assembly according to claim 5, characterized in that: The limiting mechanism (5) includes, The operating part is movable relative to the locking component (4) under the action of external force; The limiting part can be pulled out or inserted into the limiting hole (31) when the operating part moves relative to the locking component (4). The operating part is movably connected to the locking assembly (4) via the elastic component.

7. The table frame structure for rapid assembly according to claim 6, characterized in that: The operating part includes a handle (51a) that protrudes from the surface of the locking assembly (4); The limiting part includes a first limiting member (52a), one end of which is fixedly connected to the handle (51a); the locking assembly (4) has a cavity for accommodating the first limiting member (52a); The elastic component includes a first spring (53a), which is sleeved on the first limiting member (52a) and is also located in the cavity. One end of the first spring (53a) abuts against the cavity, and the other end is fixedly connected to the end of the first limiting member (52a) away from the handle (51a). When the handle (51a) is pulled, the first limiting member (52a) can move within the cavity along the axis of the first spring (53a) to insert into the limiting hole (31) or separate from the limiting hole (31).

8. The table frame structure for rapid assembly according to claim 6, characterized in that: The operating part includes a pressing part (51b) that protrudes from the surface of the locking component (4); The limiting part includes a second limiting member (52b), which is slidably connected to the pressing part (51b); The elastic component includes a second spring (53b), one end of which abuts against the locking assembly (4), and the other end of which abuts against the pressing part (51b).

9. A table frame structure for rapid assembly according to claim 8, characterized in that: The pressing part (51b) is provided with a pin (510b), and the second limiting member (52b) is provided with a guide groove (521b) for sliding the pin (510b), and the two ends of the guide groove (521b) are closed. When the pressing part (51b) moves relative to the locking assembly (4), the pin (510b) slides along the guide groove (521b), causing the second limiting member (52b) to move along the axial direction of the fastener (6) to insert into the limiting hole (31) or separate from the limiting hole (31).

10. A table frame structure for rapid assembly according to claim 6, characterized in that: The operating part includes a sliding part (51c); The limiting part includes a third limiting member (52c), which is fixedly connected to the sliding part (51c); The elastic component includes a third spring (53c), one end of which abuts against the locking assembly (4), and the other end of which abuts against the third limiting member (52c); When the sliding part (51c) slides, it drives the third limiting member (52c) to move along the axis of the third spring (53c) to insert into the limiting hole (31) or separate from the limiting hole (31).

11. The table frame structure for rapid assembly according to claim 10, characterized in that: The connecting beam (3) is provided with at least one protruding pin (34); wherein, When the column assembly is in the unlocked state and the cam (41) abuts against the protruding pin (34), the protruding pin (34) can limit the cam (41) from over-rotating; Or, when the handle (42) rotates from the second state to the first state until the locking assembly (4) abuts against the protruding pin (34), the protruding pin (34) can restrict the cam (41) from continuing to rotate.

12. A table frame structure for rapid assembly according to any one of claims 8 to 11, characterized in that: The connecting beam (3) is provided with a transition groove (33); the end of the limiting part away from the operating part is provided with a protruding head (520), the protruding head (520) is roughly conical and gradually shrinks towards the transition groove (33); Wherein, along the height direction of the column body (2), the size of the conical flared end of the convex head (520) is larger than the opening size of the transition groove (33); When the limiting part engages with the transition groove (33), only the tapered tapered end of the protruding head (520) is embedded in the transition groove (33), while the tapered flared end is located outside the transition groove (33).

13. A table frame structure for rapid assembly according to claim 12, characterized in that: When the limiting part engages with the transition groove (33), the contact point between the cam (41) and the plane (12) does not pass through the maximum outer diameter point of the cam (41); When the limiting part is inserted into the limiting hole (31), the convex head (520) is fully embedded in the limiting hole (31), and the contact point between the cam (41) and the plane (12) passes the maximum point of the outer diameter of the cam (41).

14. The table frame structure for rapid assembly according to claim 1, characterized in that: There is at least one pair of connecting beams (3), and the column assembly and locking assembly (4) are both located between a pair of connecting beams (3).

15. A table frame structure for rapid assembly according to claim 2, characterized in that: The motor box (1) is snapped together with the connecting beam (3). The side of the motor box (1) opposite to the connecting beam (3) is provided with a snap-fit ​​assembly (11). The inner side of the connecting beam (3) is provided with a slot assembly (32) that is compatible with the snap-fit ​​assembly (11).

16. A method for assembling a table frame structure quickly, characterized in that: The installation steps are as follows: S1: Move the limiting part out of the limiting hole on the connecting beam to release the rotation restriction of the cam; S2: Gradually bring the buckle assembly on the motor box closer to and snap it into the slot assembly on the connecting beam; S3: The flip handle drives the cam to rotate until the first limit piece automatically pops into the limit hole, and the column assembly is locked on the connecting beam.

17. A method for assembling a table frame structure quickly, characterized in that: The installation steps are as follows: S1': Gradually bring the buckle assembly on the motor box closer to and snap it into the slot assembly on the connecting beam. Under the gravity of the motor box, the second or third limiting piece disengages from the transition groove. S2': Press the handle to rotate the cam until the second or third limit piece automatically pops into the limit hole on the connecting beam, and the column assembly is locked on the connecting beam.

18. A method for assembling a table frame structure for rapid assembly according to claim 16 or 17, characterized in that: When the latching assembly approaches the slot assembly, the bottom of the motor box first contacts the cam. Driven by the bottom of the motor box, the cam, along with the handle, rotates around the fastener.

19. A method for disassembling a table frame structure that allows for rapid assembly, characterized in that: The disassembly steps are as follows: T1: Move the limiting part out of the limiting hole on the connecting beam to release the rotation restriction of the cam; T2: Rotate the handle in the opposite direction so that the contact point between the end face of the cam and the plane of the motor box moves away from point O, and the cam is released from the motor box; T3: Remove the column assembly from the connecting beam.

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