A hidden lift tea table

Abstract

The present invention relates to a concealed lifting tea table. It includes a table body, a tea table top, two flip covers, and a lifting motor. The inner end of the second connecting rod is rotatably connected to the upper end of the third connecting rod. The second connecting rod is provided with an inner limit plate on the inner side of the first connecting rod. An inner tension spring is provided between the first connecting rod and the second connecting rod, or the outer end of the second connecting rod is provided with an outer limit plate on the outer side of the first connecting rod. Due to the rotational connection and force-bearing relationship between the first connecting rod and the second connecting rod, the two flip covers can only move upward after they touch each other. Therefore, when the two flip covers of the present invention are closed, they first flip upward and inward below the opening of the table body, and then move upward after the two flip covers are closed, and finally move to the opening of the table body, thus completely avoiding the interference of the table board. Therefore, the present invention can be paired with two flip covers of any thickness, and it can ensure that the gap between the flip cover and the opening edge of the table body is less than 3 mm. The present invention is convenient and flexible to produce.

Description

Technical Field

[0001] The present invention relates to the technical field of tea tables, and particularly relates to a hidden lifting tea table. Background Art

[0002] Currently, an existing hidden lifting tea table, such as a lifting tea table with a hidden function announced on April 24, 2020 with Chinese Patent No. 201921032412.8. When not in use for drinking tea, the top plate of the tea table can be lowered into the inner cavity of the tea table. After the motor drives the top plate of the tea table to descend a certain height, the top plate of the tea table presses the limit rod downward, and the limit rod drives two first racks to move downward simultaneously. Then, the two buckle plates rotate respectively under the action of the tooth grooves of the two first racks. The two buckle plates drive the two table board bodies to turn upward in opposite directions at the same time. Finally, the two table board bodies move from the vertical state to the horizontal state, and the two table board bodies finally lean against each other and cover the opening of the inner cavity of the tea table. After that, the surface of the tea table is flat and becomes an ordinary table, and the top plate of the tea table keeps pressing down on the limit rod. When the user wants to drink tea, the top plate of the tea table can be controlled to rise out of the inner cavity of the tea table. The motor drives the top plate of the tea table to rise. The two table board bodies turn downward due to their own gravity, and the two buckle plates also turn downward accordingly, thereby driving the two first racks and the limit rod to rise. The limit rod rises along the bottom of the top plate of the tea table. The two table board bodies turn downward into the inner cavity of the tea table at the same time, and the top plate of the tea table covers the opening of the inner cavity of the tea table, making it a tea table, thus realizing the switching between the tea table and the ordinary table. Of course, in addition to the above patent using the motor to cooperate with the gear rack to drive the two flip covers to flip and close or open, the existing hidden lifting tea tables also have the method of using the motor to cooperate with the screw rod and the lifting nut block to drive the two flip covers to flip and close or open. The lifting nut block is threadedly connected to the screw rod, and the lifting nut block is connected to the tea table. The motor drives the lifting nut block to rise and fall through the screw rod, and the lifting nut block thereby drives the tea table to descend into the inner cavity of the tea table or rise out of the inner cavity of the tea table. However, the existing hidden lifting tea tables have the following deficiencies:

[0003] (1) The rotation mode of the flip frame of the existing hidden lift tea table is centering and fixed-length rotation. The distance between the flip cover and the rotation center of the flip frame is constant. Therefore, the flip frame can only drive the flip cover to rotate. To prevent interference between the two flip covers and the tabletop during flipping, the production enterprises of lift tea tables need to make the edge of the opening of the tea table inner cavity very thin (i.e., reduce the thickness of the tabletop at the opening), which ultimately results in insufficient strength of the edge of the opening of the tea table inner cavity and is easily deformed by pressure; or, the production enterprises of hidden lift tea tables design a large gap between the outer edge of the flip cover and the edge of the inner cavity opening. After the two flip covers are completely closed, there is a large gap between the outer edge of the flip cover and the edge of the inner cavity opening, resulting in an unattractive appearance of the tea table surface after it is converted into an ordinary table. The above gap is approximately equal to the thickness of the tabletop at the opening. For the existing hidden lift tea tables on the market, the tabletop around the opening position generally uses thin plates with a thickness ≤ 3mm, such as steel plates, and then generally pastes wood grain paper on the upper surface of the steel plate to make the upper surface appearance of the tabletop consistent with the overall wooden tea table. Because wooden boards with a thickness ≤ 3mm are not only inconvenient for production but also have insufficient strength. The tabletop of some hidden lift tea tables on the market can also be directly made of wooden boards. For wooden boards, the production enterprises of hidden lift tea tables adopt the method of reducing the thickness of the tabletop at the opening. However, the thickness of the wooden board is generally greater than 3mm. At this time, chamfers need to be made on the inner cavity of the tabletop. The minimum gap between the flip cover and the inner cavity of the tabletop is approximately equal to the thickness of the thinnest part at the chamfer position of the inner cavity. To make this minimum gap as small as possible, this thickness needs to be as small as possible. When this thickness is ≤ 3mm, the strength of the tabletop at this thickness will be severely weakened, and there will inevitably be a natural contradiction that it is impossible to have both the minimum gap as small as possible and the tabletop strength not being severely weakened. (2) At present, the lift tea tables on the market that use a lead screw and a lead screw nut block to achieve the flipping of the flip cover have high requirements for the accuracy of the motor. If the lead screw nut block does not descend to the proper position, it will cause the two flip covers not to close properly, and there will be an obvious gap between the two flip covers. At the same time, the two flip covers do not flip up to the proper position, and the top surfaces of the two flip covers are not flush with the tabletop of the table, ultimately resulting in an unattractive appearance of the tabletop. If the lead screw nut block descends too far, it will cause the two flip covers to squeeze against each other, the motor will be in an overloaded working state, and the motor will also overheat and even burn out due to locked rotor, shortening the service life. (3) In addition, the two flip covers of the existing hidden lift tea tables on the market close towards each other under the drive of the motor. The two flip covers are clamped towards each other, and they clamp tighter and tighter under the drive of the motor. It is easy for the user's fingers to be pinched, or even pinched off, posing a great safety hazard. Therefore, the structure of the existing hidden lift tea tables needs to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a hidden lift coffee table that can avoid interference between the flip cover and the opening of the table body, is easy to produce, can ensure that the two flip covers can be completely closed and flipped upward into place and flush with the table surface, the gap between the flip cover and the opening of the table body after closing is small and uniform, and the opening of the table body is thick and high in strength.

[0005] The object of the present invention is achieved like this:

[0006] A hidden lifting coffee table comprises a table body, a coffee table, two flip cover plates, a fixed plate, a lifting motor, a first transmission shaft, a second transmission shaft, a third transmission shaft, a fourth transmission shaft, a transition bevel gear, and a cover flip linkage mechanism that drives the two flip cover plates to close toward each other or open away from each other at the opening of the table body. The table body is provided with a coffee table storage cavity for accommodating the coffee table, and the desktop of the table body is provided with an opening corresponding to the coffee table storage cavity. The cover flip linkage mechanism is arranged in the table body and on one side of the coffee table. The cover flip linkage mechanism comprises a lifting screw, a lifting block, a support frame, an intermediate connecting rod, an anti-cover pinching assembly and two cover flip assemblies symmetrically arranged on the left and right sides of the lifting block. The lifting screw is vertically arranged on the table body, and the lifting block slides up and down. The coffee table is fixedly connected to the lifting block, the lifting motor and the support frame are mounted on the table body, the lifting motor drives the lifting screw to rotate, and the cover flip assembly includes a first connecting rod, a second connecting rod, and a third connecting rod. The cover flip assembly includes a first connecting rod, a second connecting rod, and a third connecting rod. The second connecting rod is rotatably mounted on the support frame, the bottom end of the first connecting rod is rotatably connected to the outer end of the second connecting rod, the two flip cover plates are respectively mounted on the top end of the first connecting rod of the two cover flip assemblies, the inner end of the second connecting rod is rotatably connected to the upper end of the third connecting rod, the second connecting rod is provided with an inner limit plate on the inner side of the first connecting rod, an inner tension spring is provided between the first and second connecting rods, or the outer end of the second connecting rod is provided with an outer limit plate on the outer side of the first connecting rod. When the lifting block descends and drives the third connecting rods of the two cover flip assemblies to move downward together, the two flip cover plates first flip toward each other and close below the opening of the table body, and then the two flip cover plates rise together into the opening of the table body, thereby closing the opening of the table body. Due to the action of the flip cover's own gravity or other external forces, the flip cover has a tendency to move downward and flip outward, and the third connecting rod has a tendency to move upward. When the lifting block rises, the third connecting rods of the two cover flipping assemblies move upward with the lifting block. The two flip cover plates first descend together and separate from the opening of the table body, and then flip back to back and separate, thereby opening the opening of the table body.

[0007] More specifically, when the tea table of the present invention descends with the lifting block, and when the lifting block descends to press against the third link of the first and second cover flipping assemblies, the lifting block will drive the lower end of the third link of the first and second cover flipping assemblies to descend. The upper end of the third link then pulls the inner end of the second link to rotate downward, thereby driving the first link and the two flipping covers to rotate upward until the two flipping covers abut and close below the opening of the table body. After that, the two flipping covers continue to rise to the opening of the table body, thus closing the opening of the table body. Conversely, when the tea table of the present invention rises with the lifting block, the two flipping covers first move downward to disengage from the opening, and then flip downward into the storage cavity of the tea table. The opening of the table body is opened. The outer ends of the first link and the second link flip outward and downward. The two flipping covers, the upper end of the second link, and the pulling spring generate an upward pulling force on the third link. The lower end of the third link abuts against the lifting block and rises with the lifting block. The third link stops rising when it reaches a certain position, while the lifting block and the tea table continue to rise, and finally the tea table rises to the in-place position.

[0008] The inner pulling spring of the present invention increases the moment of the two flipping covers to flip inward, increases the force of the two flipping covers to squeeze each other, and ensures that the two flipping covers are completely closed after flipping in place. In addition, when the two flipping covers flip, the inner pulling spring enables the inner limiting plates of the first link and the second link to maintain a fixed angle (usually 90°) when flipping. When the two flipping covers flip inward, the inner limiting plate restricts the degree of the first link rotating inward. When the two flipping covers flip outward, the inner limiting plate pushes the first link to move outward.

[0009] After the two flipping covers flip into the storage cavity of the tea table, the left and right first links of the present invention will rotate downward and abut against the outer limiting plates on the left and right second links. Under the action of the outer limiting plates, the left and right first links will stop rotating downward. When the two flipping covers flip upward and close, the outer ends of the left and right second links flip upward, and the left and right first links abut against the outer limiting plates on the outer ends of the left and right second links. Therefore, the outer ends of the left and right second links can drive the left and right first links to flip upward.

[0010] The present invention can also be further improved as follows.

[0011] The anti-cover-plate pinching assembly includes an upper screw nut, a lower screw nut, an upper compression spring and a lower compression spring. The thread direction of the lower screw nut is the same as that of the upper screw nut. The upper screw nut and the lower screw nut are arranged on the lifting screw rod and are in threaded connection with the lifting screw rod. The lifting block is located between the upper screw nut and the lower screw nut. The upper compression spring is arranged between the upper screw nut and the lifting block. The lower compression spring is arranged between the lower screw nut and the lifting block. Since the thread direction of the lower screw nut is the same as that of the upper screw nut, the lifting screw rod can drive the lower screw nut and the upper screw nut to move in the same way. The upper screw nut and the lower screw nut are arranged on the lifting screw rod and are in threaded connection with the lifting screw rod. The lifting block is located between the upper screw nut and the lower screw nut. The upper compression spring is arranged between the upper screw nut and the lifting block. The lower compression spring is arranged between the lower screw nut and the lifting block.

[0012] The first cover plate flipping assembly and the second cover plate flipping assembly are symmetrically arranged on the left and right sides of the lifting block, so that the actions of the first cover plate flipping assembly and the second cover plate flipping assembly are symmetric and synchronous.

[0013] The cover plate flipping assembly further includes a lower pull spring. The lower end of the lower pull spring is connected to the third connecting rod. The upper end of the lower pull spring is connected to a position with a horizontal height higher than the lower end of the lower pull spring. Therefore, the upper end of the lower pull spring can be connected to the first connecting rod or the second connecting rod or the support frame or the table body. The lower pull spring of the present invention enables the third connecting rod to rise together with the lifting block and at the same time drives the flipping cover plate to descend. Even if the cover plate flipping assembly of the present invention does not have a lower pull spring, the user can also press the flipping cover plate downward when the lifting block rises, and can also make the flipping cover plate descend. The first connecting rod, the second connecting rod and the third connecting rod move together, and finally the flipping cover plate reaches the tea table storage cavity.

[0014] The middle connecting rod is horizontally arranged on the support frame and is located below the lifting block. The middle connecting rod is slidably arranged up and down on the support frame. The lower ends of the third connecting rods of the two cover plate flipping assemblies are both rotatably connected to the middle connecting rod. When the middle connecting rod of the present invention is pressed down by the lifting block, the middle connecting rod simultaneously drives the lower ends of the third connecting rods of the first and second cover plate flipping assemblies to descend synchronously. When the lifting block of the present invention rises, the two flipping cover plates, the left and right third connecting rods, the left and right second connecting rods and the left and right lower pull springs generate an upward pulling force on the middle connecting rod. The left and right third connecting rods pull the middle connecting rod to rise. The middle connecting rod abuts against the lifting block and rises together with the lifting block, so as to ensure that the flipping actions of the first and second cover plate flipping assemblies are symmetric and synchronous.

[0015] The intermediate connecting rod is horizontally arranged on the support frame and is located below the lifting block. The intermediate connecting rod is slidably arranged up and down on the support frame. The lower ends of the third connecting rods of the two cover flipping assemblies are both rotatably connected to the intermediate connecting rod. The cover flipping assembly further includes a downward pulling spring. The lower end of the downward pulling spring is connected to the intermediate connecting rod, and the upper end of the downward pulling spring is connected to a position with a horizontal height higher than the lower end of the downward pulling spring.

[0016] The second connecting rod is provided with an inner limiting plate on the inner side of the first connecting rod. After the two flipping covers are turned into the storage cavity of the tea table, under the pulling force of the inner pulling spring and the gravity of the two flipping covers, the first connecting rod remains abutted against the inner limiting plate of the second connecting rod. The outer ends of the first connecting rod and the second connecting rod are connected at a fixed angle, and this angle generally adopts 90 degrees.

[0017] The outer end of the second connecting rod is provided with an outer limiting plate on the outer side of the first connecting rod. After the two flipping covers are turned into the storage cavity of the tea table, if the pulling force of the inner pulling spring is not enough to stop the first connecting rod from rotating downward, the first connecting rod will rotate downward and abut against the outer limiting plate on the second connecting rod. Under the action of the outer limiting plate, the first connecting rod will stop rotating downward.

[0018] The support frame is provided with a limiting top plate, and the limiting top plate is located above the third connecting rod. When the top end of the third connecting rod abuts against the limiting top plate, all components of the first cover flipping assembly and the second cover flipping assembly stop operating, and the flipping cover has descended in place.

[0019] The left and right sides of the support frame are provided with lifting balance guide rails in the vertical direction. The intermediate connecting rod is slidably arranged up and down on the lifting balance guide rails, so as to effectively prevent the third connecting rod from swinging randomly, resulting in the loss of balance of the first and second cover flipping assemblies and the asymmetric operation of the first and second cover flipping assemblies.

[0020] A positioning groove corresponding to the lifting block is provided at the middle position of the intermediate connecting rod, so that when the lifting block ascends and descends, it will not swing randomly, resulting in the loss of balance of the first and second cover flipping assemblies and the asymmetric operation of the first and second cover flipping assemblies, resulting in failure to close normally.

[0021] The two ends and / or the outer edges of the flipping cover are provided with first limiting steps, the two ends and / or the two sides of the tea table are provided with second limiting steps, and the side walls of the opening of the table body are provided with limiting grooves corresponding to the positions of the first limiting steps. When the flipping cover or the tea table ascends in place, the first limiting step or the second limiting step abuts against the limiting groove of the opening of the table body, and the top surface of the flipping cover or the table top of the tea table is flush with the table top of the table body.

[0022] A positioning upper chamfer is provided at a position on the limiting groove corresponding to the first limiting step, and a positioning lower chamfer is provided on the first limiting step. The positioning upper chamfer and the positioning lower chamfer guide the automatic positioning of the flipping cover plate, so that the periphery of the flipping cover plate can be automatically aligned with the opening of the table body. At the same time, it also prevents one end of the flipping cover plate from shifting too much, and its first limiting step is prematurely stuck by the bottom surface of the table board and does not rise into the limiting groove, resulting in the flipping cover plate being unable to rise to the opening of the table body and the top surface of the flipping cover plate being uneven with the surface of the table board.

[0023] Lifting balance guide rails are provided along the vertical direction on the left and right sides of the support frame, and the middle connecting rod is slidably arranged up and down on the lifting balance guide rails, thereby effectively preventing the third connecting rod from swinging randomly, resulting in the loss of balance of the first and second cover plate flipping assemblies and the asymmetric movement of the first and second cover plate flipping assemblies.

[0024] The upper screw nut, the lifting block and the lower screw nut are connected by bolts and nuts. The bolts pass through the upper screw nut, the lifting block and the lower screw nut and are connected to the nuts. The bolts and nuts connect the upper screw nut, the lifting block and the lower screw nut into one body. The upper screw nut, the lifting block and the lower screw nut can achieve synchronous lifting, and the upper screw nut, the lifting block and the lower screw nut can only slide up and down relative to the lifting screw and cannot rotate relative to the screw.

[0025] The upper screw nut, the lifting block and the lower screw nut are connected by hollow pins and screws. A threaded hole is provided at the end of the hollow pin. The hollow pin passes through the upper screw nut, the lifting block and the lower screw nut, and the threaded hole of the hollow pin is connected to the screw. The hollow pin and the screw connect the upper screw nut, the lifting block and the lower screw nut into one body. The upper screw nut, the lifting block and the lower screw nut can achieve synchronous lifting, and the upper screw nut, the lifting block and the lower screw nut can only slide up and down relative to the lifting screw and cannot rotate relative to the screw.

[0026] The upper screw nut, the lifting block and the lower screw nut are connected by solid pins and split pins. The solid pin passes through the upper screw nut, the lifting block and the lower screw nut and is connected to the split pin. The solid pin and the split pin connect the upper screw nut, the lifting block and the lower screw nut into one body. The upper screw nut, the lifting block and the lower screw nut can achieve synchronous lifting, and the upper screw nut, the lifting block and the lower screw nut can only slide up and down relative to the lifting screw and cannot rotate relative to the screw.

[0027] Two cover plate flip linkage mechanisms are located on either side of the coffee table. A fixed bearing is provided at the bottom end of the lifting screw, which is mounted on a bearing seat on a fixed plate. One end of the fixed plate is fixedly connected to the support frame of one cover plate flip linkage mechanism, while the other end of the fixed plate is fixedly connected to the support frame of the other cover plate flip linkage mechanism. The fixed plate of the present invention connects the two support frames into one, thereby strengthening the rigidity of the two support frames and preventing them from shaking. It also secures the lifting screw, preventing it from shaking.

[0028] The first transmission shaft, the second transmission shaft, the third transmission shaft and the fourth transmission shaft are arranged in a 冂 shape, the lifting motor is a dual-output motor, the two output ends of the dual-output motor are respectively connected to the inner end of the first transmission shaft and the inner end of the second transmission shaft, the outer end of the first transmission shaft, the outer end of the second transmission shaft, and both ends of the third transmission shaft and the fourth transmission shaft are provided with bevel gears, the lifting screw is vertically arranged on the lifting motor, and the two adjacent bevel gears are transmitted through a transition bevel gear, the upper end of the lifting screw of one cover plate flip linkage mechanism is provided with a first lifting transmission bevel gear, and the upper end of the lifting screw of the other cover plate flip linkage mechanism is provided with a second lifting transmission bevel gear, the first lifting transmission bevel gear is meshed with the bevel gear of the third transmission shaft, and the second lifting transmission bevel gear is meshed with the bevel gear of the fourth transmission shaft.

[0029] The beneficial effects of the present invention are as follows:

[0030] (1) When the coffee table of the present invention is turned into an ordinary table, the lifting motor of the present invention drives the lifting screw to rotate, the lifting screw drives the lifting block to move downward, the lifting block drives the coffee table and the middle connecting rod to move downward, the middle connecting rod drives the third connecting rod to move downward, the third connecting rod drives the second connecting rod to rotate on the support frame, the second connecting rod and the inner tension spring together drive the first connecting rod to rotate upward, or the second connecting rod and the outer limit plate on the second connecting rod together drive the first connecting rod to rotate upward, the two first connecting rods respectively drive the two flip cover plates to flip upward and inward, and then the inner edges of the two flip cover plates are The lower parts of the table tops are pressed against each other. Due to the rotational connection and force relationship between the first connecting rod and the second connecting rod, the two flip cover plates can only move upward after colliding. Therefore, when the two flip cover plates of the present invention are closed, they are first flipped inward upward under the opening of the table body. After the two flip cover plates are closed, they move upward and finally move to the opening of the table body, thus completely avoiding the interference of the table tops. Therefore, the present invention can be used with two flip cover plates of any thickness, and can ensure that the gap between the flip cover plate and the opening edge of the table body is less than 3 mm. The present invention is easy and flexible to produce.

[0031] (2) After the two flipping covers of the present invention are flipped upwards to the in-place position, the lifting block stops moving, and the lifting motor continues to drive the lifting lead screw to rotate. The lifting lead screw drives the upper lead screw nut and the lower lead screw nut to continue moving downwards. The upper compression spring continues to be compressed downwards, its length becomes smaller, and the compression amount increases. The length of the lower compression spring becomes longer, and the compression amount decreases. It is not until the contact point of the upper limit switch touches the upper surface of the lifting block that the lifting motor stops working, thereby ensuring that the tea table or the two flipping covers can be completely closed, and the upper surfaces of the two flipping covers are flush with the tabletop of the table body.

[0032] (3) Moreover, the thickness of the opening of the table body of the present invention at the thinnest part can be made greater than 3 mm, thus ensuring that the strength of the table board is not severely weakened, and achieving both the smallest possible gap and the non-severe weakening of the table board strength.

[0033] (4) In addition, the present invention can completely close the two flipping covers, the gap between the two flipping covers is small, and the upper surface of the flipping cover is flush with the tabletop of the table board.

[0034] (5) Further, the present invention can make the upper surface of the tea table flush with the tabletop of the table board after the tea table is raised to the highest position.

[0035] (6) Even better, after the two flipping covers pinch a person's finger, the cover and the first link stop moving inwards, and the tea table lifting drive motor can continue to rotate. At this time, the torque acting on the person's finger is the relatively small rotational torque of the flipping cover. This rotational torque comes from the pulling force of the inner tension spring or the torque generated by the gravity of the flipping cover on the rotating shaft of the first link. The user can push the flipping cover to both sides and quickly retract the finger, thereby achieving a certain degree of anti-pinch function. The motor will not be blocked by foreign objects and stall, resulting in possible overheating or even burnout.

[0036] (VII) Additionally, when the second connecting rod and the inner tension spring drive the first connecting rod to rotate upward together, if the two flipping covers clamp a person's limb or foreign object, the inner tension spring will be stretched and its length will increase. The stretching amount of the inner tension spring increases and the pulling force increases. The tea table lifting drive motor continues to operate, and the upper lead screw nut continues to drive the upper compression spring downward. At this time, the compression amount of the upper compression spring needs to increase with the increase in the stretching amount of the inner tension spring, and the length of the upper compression spring shortens, so as to continue to press the lifting block downward. As the stretching amount of the inner tension spring further increases, the length of the upper compression spring will further shorten, and the limit switch on the upper lead screw nut that drives the upper compression spring downward gradually approaches the top surface of the lifting block. The length of the upper compression spring continues to shorten until the limit switch on the upper lead screw nut touches the top surface of the lifting block, at which point the tea table lifting drive motor will stop, thus preventing the tea table lifting drive motor from continuously operating, further ensuring that a person's limb will not be pinched or even severed, and the motor will not be blocked due to foreign object jamming, resulting in possible overheating or even burnout. Or, when the second connecting rod and the outer limit plate on the second connecting rod drive the first connecting rod to rotate upward together, after the two flipping covers clamp a person's limb or foreign object, they stop flipping inward. At this time, the outer limit plate has not yet touched the first connecting rod, and the third connecting rod can drive the second connecting rod to continue rotating (if the outer limit plate has already touched the first connecting rod, the third connecting rod cannot drive the second connecting rod to continue rotating). The two flipping covers continue to move upward until their upper surfaces touch the lower surface of the tabletop and then stop moving. At this time, the lifting block also stops moving. The tea table lifting drive motor continues to operate, and the upper lead screw nut continues to drive the upper compression spring downward. The compression amount of the upper compression spring increases and the length of the upper compression spring shortens. The limit switch on the upper lead screw nut that drives the upper compression spring downward gradually approaches the top surface of the lifting block. The length of the upper compression spring continues to shorten until the limit switch on the upper lead screw nut touches the top surface of the lifting block, at which point the tea table lifting drive motor will stop, thus preventing the tea table lifting drive motor from continuously operating, further ensuring that a person's limb will not be pinched or even severed, and the motor will not be blocked due to foreign object jamming, resulting in possible overheating or even burnout.

[0037] (VIII) Moreover, after the two flipping covers of the present invention are flipped upward in place, they can be as aligned as possible, and the gaps between the two flipping covers and the opening edge of the table body can be as small and uniform as possible, thereby making the appearance of the ordinary table of the present invention beautiful.

[0038] (IX) Moreover, after the lifting motor of the present invention has the two flipping covers flipped and closed and clamped on a foreign object or a person's limb, it can automatically stop. The designs of the upper nut, lower nut, upper compression spring, lower compression spring, and the threadless lifting block of the present invention, in addition to achieving the functions in terms of movement, also make the whole mechanism no longer a rigid mechanism. Even without setting a foreign object detection sensor or adopting a complex circuit to control the motor to stop urgently, when the tea table or the flipping cover encounters a foreign object jam, it can remain stopped, the lifting motor can continue to work, and the upper compression spring or the lower compression spring can continue to squeeze the stopped lifting block until the limit switch of the upper nut or the lower nut touches the upper surface or the lower surface of the slider, or the working duration of the synchronous motor reaches the set working duration, then the lifting motor will stop working. During the process from the foreign object being jammed to the lifting motor stopping working, the tea table or the flipping cover will no longer move, is not easily damaged by the foreign object, the lifting motor continues to rotate for a short time and stops quickly, and conversely the foreign object is not easily damaged by the tea table or the flipping cover either. Therefore, it has a certain degree of mechanical anti-jamming function and also has a certain degree of mechanical anti-pinching function.

[0039] (X) In addition, when a user's limb is clamped by the two closed flipping covers, the two flipping covers will stop moving, the lifting block will also stop moving, the motor continues to drive the lifting screw rod to rotate, the lifting screw rod drives the upper screw nut and the lower screw nut to continue moving downward, the upper compression spring continues to be compressed downward with an increased compression amount, the compression amount of the lower compression spring decreases, the contact point of the upper limit switch touches the upper surface of the lifting block, and the lifting motor stops working. During this process, both of the two flipping covers stop moving and will not close further. The static pressure of the two flipping covers clamping a person's limb is limited and a small force, and this static pressure mainly comes from the pulling force of the inner tension spring or the torque generated by the gravity of the flipping cover on the rotating shaft of the first connecting rod. The above-mentioned force and torque are within the tolerable range when a person's limb is squeezed. Therefore, the clamping force of the two flipping covers is small, which can prevent the situation of pinching or even breaking the user's limb from occurring. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of the improved hidden lifting tea table of the first embodiment of the present invention (the tea table is in the rising and exposed state).

[0041] Figure 2 is a schematic structural diagram of the improved hidden lifting tea table of the first embodiment of the present invention when the tea table is in the descending and hidden state. Figure 3 is Figure 1 a top view of

[0042] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in Figure 5 is Figure 3 a cross-sectional view taken along line B-B in

[0043] Figure 6 is Figure 2 the top view. Figure 7 is Figure 6 the sectional view taken along line C-C in

[0044] Figure 8 is Figure 6 the sectional view taken along line D-D in

[0045] Figure 9 the top view when the first and second flip covers of the present invention touch each other below the opening of the table body. Figure 10 is Figure 9 the sectional view taken along line E-E in

[0046] Figure 11 the top view when the first and second flip covers of the present invention are in a horizontal state (without touching each other) below the opening of the table body.

[0047] Figure 12 is is Figure 11 the sectional view taken along line F-F in

[0048] Figure 13 the exploded structural schematic diagram of the improved hidden lifting tea table of the present invention.

[0049] Figure 14 the structural schematic diagram of the opening of the table body of the present invention.

[0050] Figure 15 the structural schematic diagram of the first cover flip linkage mechanism and the second cover flip linkage mechanism of the present invention in the state where the tea table is lifted.

[0051] Figure 16 the structural schematic diagram of the first cover flip linkage mechanism and the second cover flip linkage mechanism of the present invention in the state where the tea table is lowered. Figure 17 is Figure 4 the enlarged view at A in

[0052] Figure 18 the structural schematic diagram of the connection between the hollow pin and the screw of the present invention.

[0053] Figure 19 the structural schematic diagram of the connection between the solid pin and the split pin of the present invention.

[0054] Figure 20 the structural schematic diagram of the first (second) cover flip linkage mechanism (the lifting block is at the highest point) of the present invention. Figure 21 is Figure 20 the structural schematic diagram from another angle of

[0055] Figure 22It is a schematic structural diagram of the first (second) cover flipping linkage mechanism of the present invention (the lifting block is at the lowest point). Figure 23 It is Figure 22 a schematic structural diagram from another angle of

[0056] Figure 24 It is Figure 10 an enlarged schematic structural diagram at position B in Figure 25 It is Figure 12 an enlarged schematic structural diagram at position C in

[0057] Figure 26 It is an exploded schematic structural diagram of the first (second) cover flipping linkage mechanism of the present invention. Figure 27 It is Figure 7 an enlarged schematic structural diagram at position D in

[0058] Figure 28 It is a cross-sectional view showing that the first and second flipping covers of the present invention stop moving when clamping the user's finger when they are closed.

[0059] Figure 29 It is a cross-sectional view showing that the first and second flipping covers of the present invention stop moving when clamping the user's palm when they are closed.

[0060] Figure 30 It is a cross-sectional view showing that the first and second flipping covers of the present invention stop moving when clamping the user's arm when they are closed.

[0061] Figure 31 It is a schematic structural diagram of the improved hidden lifting tea table of the second embodiment of the present invention (the table body, the first correction positioning block, the second correction positioning block, the tea table top, the first flipping cover and the second flipping cover are omitted).

[0062] Figure 32 It is an exploded schematic structural diagram of the improved hidden lifting tea table of the second embodiment of the present invention (the table body, the first correction positioning block, the second correction positioning block, the tea table top, the first flipping cover and the second flipping cover are omitted).

[0063] Figure 33 It is a schematic structural diagram of the first and second flipping covers of the improved hidden lifting tea table of the third embodiment of the present invention in the open state (the table body and the tea table top are omitted).

[0064] Figure 34 It is a schematic structural diagram of the first and second flipping covers of the improved hidden lifting tea table of the third embodiment of the present invention flipped to below the opening of the table body and not yet fully closed (the table body and the tea table top are omitted).

[0065] Figure 35 It is a cross-sectional view of the first and second flipping covers of the hidden lifting tea table of the third embodiment of the present invention when flipping upward and inward.

[0066] Figure 36 This is a structural diagram of the first and second flip covers of the improved hidden lift coffee table in embodiment 4 of the present invention in an open state (the table body and coffee table are omitted).

[0067] Figure 37 It is a cross-sectional view of the improved hidden liftable coffee table according to the fourth embodiment of the present invention when the coffee table is in a raised and exposed state.

[0068] Figure 38 This is a structural diagram of the first and second flip covers of the improved hidden lift coffee table in embodiment 5 of the present invention in the open state (the table body and coffee table are omitted).

[0069] Figure 39 It is a cross-sectional view of the improved hidden liftable coffee table according to the fifth embodiment of the present invention when the coffee table is in a raised and exposed state.

[0070] Figure 40 It is a cross-sectional view of the improved hidden lift coffee table according to the fifth embodiment of the present invention when the coffee table is in a lowered and hidden state. Figure 5 、 Figure 8 、 Figure 10 、 Figure 12 as well as Figure 24 The arc-shaped double-headed arrows and the straight double-headed arrows in represent the movement directions of the first and second flip covers. DETAILED DESCRIPTION

[0071] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0072] Example 1, as Figures 1 to 30Shown is a hidden lifting tea table, which includes a table body 1, a tea table top 2, a first flip cover plate 41, a second flip cover plate 31, a fixing plate 19, two lifting motors 5, 51, a first cover plate flip linkage mechanism 13 and a second cover plate flip linkage mechanism 14. A tea table top storage cavity 11 for accommodating the tea table top is provided on the table body. An opening 12 is provided on the table surface of the table body corresponding to the tea table top storage cavity 11. The first cover plate flip linkage mechanism 13 and the second cover plate flip linkage mechanism 14 are arranged in the tea table top storage cavity 11 and are located on the left and right sides of the tea table top 2. Both the first cover plate flip linkage mechanism 13 and the second cover plate flip linkage mechanism 14 include a support frame 7, a lifting block 90, a lifting lead screw 6, a component for preventing the cover plate from pinching, and a first cover plate flip component 4 and a second cover plate flip component 3 symmetrically arranged on the left and right sides of the lifting block 90. The two lifting motors 5, 51 are respectively arranged on the support frame 7 of the first cover plate flip linkage mechanism 13 and the support frame 7 of the second cover plate flip linkage mechanism 14. The first flip cover plate 41 and the second flip cover plate 31 are respectively arranged on the first cover plate flip component 4 and the second cover plate flip component 3. The two lifting lead screws 6 are respectively vertically arranged on the two lifting motors 5, 51. The lifting block 90 is slidably arranged up and down on the corresponding lifting lead screw 6. The lifting motor 5 is arranged on the table body 1 and drives the lifting lead screw 6 to rotate. The component for preventing the cover plate from pinching includes an upper lead screw nut 91, a lower lead screw nut 92, an intermediate connecting rod 8, an upper compression spring 94 and a lower compression spring 93. The upper lead screw nut 91 and the lower lead screw nut 92 are both arranged on the lifting lead screw 6 and are threadedly connected to the lifting lead screw 6. The lifting block 90 is sleeved on the lifting lead screw 6 and is located between the upper lead screw nut 91 and the lower lead screw nut 92. The upper compression spring 94 is arranged between the upper lead screw nut 91 and the lifting block 90. The lower compression spring 93 is arranged between the lower lead screw nut 92 and the lifting block 90. The thread helix directions of the lower lead screw nut 92 and the upper lead screw nut 91 are the same. Therefore, the lifting lead screw can drive the lower lead screw nut and the upper lead screw nut to move in the same manner. Tea table fixing frames 903 are provided on both of the two lifting blocks 90. The tea table top 2 is fixedly connected to the two tea table fixing frames 903, so that the tea table top 2 rises or falls following the lifting block 90, thereby realizing the tea table top 2 rising out of the tea table top storage cavity 11 or descending into the tea table top storage cavity 11.

[0073] The first cover flipping assembly 4 and the second cover flipping assembly 3 are symmetrically arranged on the left and right sides of the lifting block 90 respectively. The first cover flipping assembly 4 includes a left first connecting rod 42, a left second connecting rod 43 and a left third connecting rod 44. The left second connecting rod 43 is rotatably arranged on the support frame 7. The bottom end of the left first connecting rod 42 is rotatably connected to the outer end of the left second connecting rod 43. The first flipping cover 41 is arranged at the top end of the left first connecting rod 42. The inner end of the left second connecting rod 43 is rotatably connected to the upper end of the left third connecting rod 44. A left inner tension spring 46 is arranged between the outer side of the left second connecting rod 43 and the left first connecting rod 42. A left lower tension spring 45 is arranged between the inner side of the left second connecting rod 43 and the left third connecting rod 44.

[0074] The second cover flipping assembly 3 includes a right first connecting rod 32, a right second connecting rod 33 and a right third connecting rod 34. The right second connecting rod 33 is rotatably arranged on the support frame 7. The bottom end of the right first connecting rod 32 is rotatably connected to the outer end of the right second connecting rod 33. The second flipping cover 31 is arranged at the top end of the right first connecting rod 32. The inner end of the right second connecting rod 33 is rotatably connected to the upper end of the right third connecting rod 34. A right inner tension spring 36 is arranged between the outer side of the right second connecting rod 33 and the right first connecting rod 32. A right lower tension spring 35 is arranged between the inner side of the right second connecting rod 33 and the right third connecting rod 34. The middle connecting rod 8 is horizontally arranged on the support frame and is located below the lifting block 90. The lower ends of the left third connecting rod 44 of the first cover flipping assembly 4 and the right third connecting rod 34 of the second cover flipping assembly 3 are both rotatably connected to the middle connecting rod 8.

[0075] As a more specific technical solution of this embodiment.

[0076] The first flipping cover 41 and the second flipping cover 31 are in the shape of rectangular plates. The first cover flipping assembly 4 and the second cover flipping assembly 3 are symmetrically arranged on the left and right sides of the lifting block 90.

[0077] The outer end of the left second link 43 is provided with a left inner limiting plate 370 on the inner side of the bottom end of the first link, and the outer end of the left second link 43 is provided with a left outer limiting plate 372 on the outer side of the bottom end of the first link. The outer end of the right second link 43 is provided with a right inner limiting plate 37 on the inner side of the bottom end of the first link, and the outer end of the right second link 33 is provided with a right outer limiting plate 371 on the outer side of the bottom end of the first link. After the first and second flip covers 41 and 31 are turned into the tea table storage cavity 11, the left and right first links 42 and 32 are respectively under the pulling force of the left and right inner tension springs and the gravity of the first and second flip covers 41 and 31. The left and right first links 42 and 32 respectively keep abutting against the left and right inner limiting plates 370 and 37. The outer ends of the left and right first links 42 and 32 and the left and right second links 43 and 33 are connected at a fixed angle, and this angle is generally 90 degrees. After the first and second flip covers 41 and 31 are turned into the tea table storage cavity 11, if the pulling forces of the left and right inner tension springs 46 and 36 are not sufficient to stop the left and right first links 42 and 32 from rotating downward, the left and right first links 42 and 32 will rotate downward and respectively abut against the left outer limiting plate 372 and the right outer limiting plate 371. Under the action of the left and right outer limiting plates 372 and 371, the left and right first links 42 and 32 will stop rotating downward. In addition, there is also the following situation. If the pulling forces of the left and right inner tension springs 46 and 36 are not sufficient to stop the left and right first links 42 and 32 from rotating downward, but after the first link 32 rotates downward for a certain distance, the stretching amounts of the left and right inner tension springs 46 and 36 increase and then the pulling forces increase, so that the first links 32 and 42 can stop rotating downward and do not abut against the left and right outer limiting plates 372 and 371.

[0078] A limiting top plate 442 is provided on the support frame 7. The limiting top plate 442 is located above the left and right third links 44 and 34. When the tops of the left and right third links 44 and 34 abut against the limiting top plate 442, the first and second flip covers 41 and 31 have descended in place. The left and right sides of the support frame 7 are provided with lifting balance guide rails 72 in the vertical direction, and the intermediate link 8 is slidably arranged up and down on the lifting balance guide rails 72.

[0079] A positioning groove 82 corresponding to the lifting block 90 is provided at the middle position of the intermediate link 8, so that when the lifting block 90 moves up and down, it will not swing randomly, resulting in the loss of balance of the first and second cover flipping assemblies 4 and 3. A fixed bearing 21 is provided at the bottom end of the lifting lead screw 6. The fixed bearing 21 is arranged on a bearing seat 20 on the fixing plate 19. The two ends of the fixing plate 19 are respectively fixedly connected to the support frame 7 of the first cover flipping linkage mechanism and the support frame 7 of the second cover flipping linkage mechanism. The fixing plate 19 of this embodiment connects the two support frames 7, thereby strengthening the rigidity of the two support frames 7, avoiding the shaking of the support frames, and at the same time fixing the lifting lead screw 6 to avoid the shaking of the lifting lead screw 6.

[0080] The opening 12, the first and second flip covers 41 and 31, and the tea table are all rectangular in shape. The sizes of the first and second flip covers 41 and 31 after being closed are adapted to the size of the opening. A limiting groove 15 is provided on the periphery of the opening 12, and a positioning upper chamfer 16 is provided on the limiting groove 15. First limiting steps 38 are provided at the left and right ends and / or outer edges of the first and second flip covers 41 and 31. A second limiting step 22 is provided on the periphery of the tea table 2. When the first and second flip covers 41 and 31 or the tea table 2 rise to the in-place position, the first limiting step 38 or the second limiting step 22 abuts against the limiting groove 15 of the opening of the table body, and the first and second flip covers 41 and 31 or the tea table 2 no longer rise. The top surfaces of the first and second flip covers 41 and 31 or the tabletop of the tea table 2 are flush with the surface of the table board. In order to limit the first and second flip covers 41 and 31 and the tea table, in this embodiment, the positions and numbers of the limiting grooves can be arbitrarily set on the four peripheries of the opening 12. Of course, the positions and numbers of the first limiting steps of the first and second flip covers 41 and 31 also need to correspond to the positions and numbers of the limiting grooves. Similarly, the positions and numbers of the second limiting steps 22 of the tea table also need to correspond to the positions and numbers of the limiting grooves.

[0081] Preferably, first limiting steps 38 are provided at the left and right ends of the first and second flipping covers 41 and 31, second limiting steps 22 are provided at the left and right ends of the tea table 2, and limiting grooves 15 are provided at positions on the side walls of the opening 12 of the table body corresponding to the first limiting steps 38. In this embodiment, it can also be designed that first limiting steps 38 are provided on the outer edges and left and right ends of the first and second flipping covers 41 and 31, second limiting steps 22 are provided on the left and right ends and front and rear side edges of the tea table 2, or first limiting steps 38 are only provided on the outsides of the first and second flipping covers 41 and 31, and second limiting steps 22 are only provided on the front and rear sides of the tea table 2. And the limiting grooves 15 can be correspondingly modified at positions corresponding to the first limiting steps 38. In this embodiment, the bottom surface of the table board can also be used to replace the limiting grooves, and the bottom surface of the table board cooperates with the first limiting steps and the second limiting steps to limit the first and second flipping covers and the tea table. Positioning upper chamfered angles 16 are provided at positions on the limiting grooves 15 corresponding to the first limiting steps, positioning lower chamfered angles 17 are provided on the first limiting steps 38, and the positioning upper chamfered angles 16 and the positioning lower chamfered angles 17 guide the automatic positioning of the first and second flipping covers 41 and 31, so that the peripheries of the first and second flipping covers 41 and 31 can be automatically aligned with the opening 12 of the table body. At the same time, it prevents one end of the first and second flipping covers 41 and 31 from shifting too much, and its first limiting step 38 is prematurely stuck by the bottom surface of the table board and does not rise into the limiting groove 15, resulting in the first and second flipping covers 41 and 31 being unable to rise to the opening 12 of the table body, and the top surfaces of the first and second flipping covers 41 and 31 being uneven with the surface of the table board. The positioning upper chamfered angles 16 can also play a role in avoiding interference, so as to prevent the outer edges and inner edges of the first and second flipping covers 41 and 31 from interfering with the peripheral edges of the opening during the flipping process of the first and second flipping covers.

[0082] On the inner edge of the first flipping cover plate 41, there are two first correction and positioning blocks 49. The two adjacent first correction and positioning blocks are arranged at intervals. On the inner edge of the second flipping cover plate 31, there are two second correction and positioning blocks 39. The two adjacent second correction and positioning blocks are arranged at intervals. The first correction and positioning blocks 49 are arranged in a dislocation manner with the positioning and correction positioning blocks. The top surfaces of the first correction and positioning blocks 49 and the second correction and positioning blocks 39 are flush with the bottom surface of the flipping cover plate. The inner ends of the first correction and positioning blocks 49 and the second correction and positioning blocks 39 are provided with guiding arc surfaces. Due to error factors such as the manufacturing precision of the workpiece and the installation precision of the workpiece, after the first and second flipping cover plates 41 and 31 are flipped and closed, there may be a height difference between the first and second flipping cover plates 41 and 31 in the height direction, and they may not be aligned in the horizontal direction either. In the case where the first and second flipping cover plates 41 and 31 are not aligned in the height direction, for example, the horizontal height of the second flipping cover plate is slightly lower than the horizontal height of the first flipping cover plate. When the first and second flipping cover plates 41 and 31 of the present embodiment are closed, the first correction and positioning block of the first flipping cover plate will lift the second flipping cover plate. The second flipping cover plate slides onto the top surface of the first correction and positioning block 49 under the guidance of the guiding arc surface of the first correction and positioning block 49. The first correction and positioning block 49 supports the second flipping cover plate, so that the second flipping cover plate can be flush with the first flipping cover plate after being closed. Vice versa, the second correction and positioning block can also play the same role. In addition, in the case where the first and second flipping cover plates 41 and 31 are not aligned in the horizontal direction, for example, the first flipping cover plate is offset to one end, and there is a large gap between the other end of the first flipping cover plate and the side wall of the opening 12 of the table body, which is very unsightly in appearance. It may occur that the first limiting step 38 of the first flipping cover plate is prematurely stuck by the bottom surface of the table board and does not rise into the limiting groove 15, resulting in the first flipping cover plate being unable to rise to the opening 12 of the table body, and the top surface of the first flipping cover plate is not flush with the surface of the table board. In the present embodiment, during the process of the two flipping cover plates being flipped and closed, the first correction and positioning block 49 is inserted between the two second correction and positioning blocks 39, and the second correction and positioning block 39 is also inserted between the two first correction and positioning blocks 49. If the first flipping cover plate is offset to one end, the first correction and positioning block 49 and the two second correction and positioning blocks 39 are mutually squeezed in the left-right direction to push the first and second flipping cover plates to slide, reducing the offset amount of the first and second flipping cover plates to one end, realizing the left-right deviation correction of the positions of the first and second flipping cover plates, so as to ensure that the positions of the first and second flipping cover plates can be aligned with the opening 12 of the table body, and the gaps between the two ends of the two flipping cover plates and the opening 12 of the table body are small and uniform.

[0083] An upper limit switch 96 is provided on the upper lead screw nut 91, and a lower limit switch 97 is provided on the lower lead screw nut 92. Of course, in this embodiment, a synchronous motor can also be used, and the working duration of the synchronous motor is set so that the working duration of the synchronous motor is greater than the time required for the tea table to move upward from the bottom until the second limit step of the tea table touches the limit groove 15 (or the bottom surface of the table board) of the table board, thereby omitting the upper and lower limit switches 96 and 97 of this embodiment. The contact point of the upper limit switch 96 is located between the upper lead screw nut 91 and the top surface of the lifting block 90, and the contact point of the lower limit switch 97 is located between the lower lead screw nut 92 and the bottom surface of the lifting block 90.

[0084] In this embodiment, the upper lead screw nut 91, the lifting block, and the lower lead screw nut 92 are connected by multiple bolts 95 and multiple nuts 951. The multiple bolts 95 pass downward through the upper lead screw nut 91, the lifting block 90, and the lower lead screw nut 92 and are connected to the multiple nuts 951. The top ends of the multiple bolts 95 press downward on the upper lead screw nut 91, and the nuts 951 press upward on the lower lead screw nut 92. The multiple bolts 95 connect the upper lead screw nut 91, the lifting block, and the lower lead screw nut 92 into one body, enabling the upper lead screw nut 91, the lifting block, and the lower lead screw nut 92 to achieve synchronous lifting. Moreover, the upper lead screw nut 91, the lifting block, and the lower lead screw nut 92 can only slide up and down relative to the lifting lead screw and cannot rotate relative to the lead screw. Additionally, the upper lead screw nut 91, the lifting block, and the lower lead screw nut 92 in this embodiment can also be connected in the following manner. For example, the upper lead screw nut 91, the lifting block, and the lower lead screw nut 92 can be connected by multiple solid pins 911 and split pins 912. The multiple solid pins pass downward through the upper lead screw nut 91, the lifting block 90, and the lower lead screw nut 92 in sequence. A pin hole 913 is provided at the bottom end of the solid pin 911, and the split pin 912 is inserted into the pin hole 913. The top end of the solid pin 911 presses downward on the upper lead screw nut 91, and the split pin 912 presses upward on the lower lead screw nut 92. Further, the upper lead screw nut, the lifting block, and the lower lead screw nut in this embodiment can also be connected by multiple hollow pins 98 and multiple screws 99. A threaded hole 910 is provided at the lower end of the hollow pin 98. The multiple hollow pins 98 pass downward through the upper lead screw nut 91, the lifting block 90, and the lower lead screw nut 92 in sequence. The threaded holes 910 of the multiple hollow pins 98 are connected to the multiple screws 99. The top ends of the multiple hollow pins 98 press downward on the upper lead screw nut 91, and the multiple screws 99 press upward on the lower lead screw nut 92. Additionally, the upper lead screw nut 91 and the lower lead screw nut 92 can be connected by screws and nuts. The screws pass through the upper lead screw nut, the lifting block 90, and the lower lead screw nut 92 and are connected to the nuts. A upper spring positioning groove 941 is provided on the bottom surface of the upper lead screw nut 91, and a lower spring positioning groove 931 is provided on the top surface of the lower lead screw nut 92. The lifting lead screw passes through the upper spring positioning groove and the lower spring positioning groove. The upper spring is sleeved on the lifting lead screw and is located within the upper spring positioning groove 941, and the lower spring is sleeved on the lifting lead screw and is located within the lower spring positioning groove 931. With such a setting, the upper spring and the lower spring are fixed more securely.

[0085] Working principle of this embodiment:

[0086] When this embodiment is converted into an ordinary table, the first cover flipping linkage mechanism 13 and the second cover flipping linkage mechanism 14 are started synchronously. The lifting motor 5 drives the lifting lead screw 6 to rotate forward. The lifting lead screw 6 drives the upper nut and the lower nut to move downward. The compression amount of the upper compression spring 94 becomes larger (the length becomes shorter), and the compression amount of the lower compression spring 93 becomes smaller (the length becomes longer). As a result, the lifting block 90 and the tea table move downward together, and squeeze the middle connecting rod 8 downward. The middle connecting rod 8 moves downward together with the lifting block 90. The middle connecting rod 8 drives the left and right third connecting rods 44, 34 to move downward. The left and right third connecting rods 44, 34 drive their respective left and right second connecting rods 43, 33 to rotate on the support frame 7. The left and right second connecting rods 43, 33 and the left and right inner tension springs 46, 36 drive the left and right first connecting rods 42, 32 to rotate upward. The left and right lower tension springs 45, 35 are stretched. The two left and right first connecting rods 42, 32 drive the first and second flipping covers 41, 31 to flip upward and inward respectively. The left and right inner tension springs 46, 36 pull the left and right first connecting rods to abut against the corresponding left and right inner limit plates 370, 37. The left and right first connecting rods 42, 32 and the first and second flipping covers 41, 31 first flip to the horizontal state, and then further flip inward by a certain angle to become an inclined state toward the inside. Then, the upper edges 18 of the inner sides of the first and second flipping covers 41, 31 abut against each other under the table board. Then, the left and right first connecting rods 42, 32 move upward under the action of the force of mutual extrusion between the first and second flipping covers 41, 31, the pulling force of the left and right inner tension springs 46, 36, and the force of the left and right second connecting rods 43, 33 being driven by the left and right third connecting rods 44, 34 to rotate upward. At the same time, the left and right inner tension springs 46, 36 are stretched, and the left and right first connecting rods disengage from their respective left and right inner limit plates 370, 37. The first and second flipping covers 41, 31 move upward together with their respective left and right first connecting rods 42, 32. At the same time, the rotating shafts of the left and right first connecting rods are driven by the left and right second connecting rods to move inward and upward. The upper ends of the left and right first connecting rods do not move inward under the action of the force of mutual extrusion between the two fixed upper flipping covers. This causes the left and right first connecting rods to flip outward and upward. The first and second flipping covers 41, 31 also slowly flip outward by a certain angle and move upward together with the left and right first connecting rods. The left and right inner tension springs 46, 36 and the left and right lower tension springs 45, 35 are stretched until the first limit steps 38 of the first and second flipping covers 41, 31 abut against the limit grooves 15 at the opening of the table body. At this time, the first and second flipping covers flip back to the horizontal state again, and the lower edges of the inner sides of the first and second flipping covers abut against each other, so that the entire inner sides of the first and second flipping covers are completely closed, and the upper surfaces of the first and second flipping covers are flush with the table top of the table body. The first and second flipping covers are in place.After that, the tea table, the support plate, and the lifting block 90 stop moving, and the left and right second linkages 43, 33, the left and right third linkages 44, 34, and the left and right first linkages 42, 32 stop rotating. The lifting motor 5 continues to drive the lifting screw rod 6 to rotate forward, the upper nut and the lower nut continue to move downward, the compression amount of the upper compression spring 94 becomes larger (the length becomes shorter), and the compression amount of the lower compression spring 93 becomes smaller (the length becomes longer) until the upper limit switch on the upper nut touches the top surface of the lifting block 90, and then the lifting motor 5 stops working and the whole mechanism stops. During this process, the upper compression spring 94 is compressed and deformed, and the upper compression spring 94 presses downward on the lifting block 90, thereby ensuring that the motor stops only after the first and second flip covers 41, 31 are flipped upward in place.When this embodiment is converted into a coffee table, the first cover flip linkage mechanism 13 and the second cover flip linkage mechanism 14 are started synchronously, the lifting motor 5 drives the lifting screw 6 to rotate in the opposite direction, and the lifting screw 6 drives the upper nut and the lower nut to move upward. At this time, the compression amount of the upper compression spring 94 becomes smaller, and the compression amount of the lower compression spring 93 becomes larger, so that the lifting block 90 drives the coffee table to move upward together, and the first and second flip cover plates and the left and right first connecting rods 42 and 32 are under the action of gravity of the first and second flip cover plates, the force of the first and second flip cover plates 41 and 31 squeezing each other, the force of the left and right second connecting rods 43 and 33 driving the downward rotation and the left and right inner tension springs 46 and 3 Under the action of the downward and inward pulling force of the first connecting rods, the left and right first connecting rods 42, 32 drive the first and second flip cover plates 41, 31 to move downward first, and then flip downward and outward. Since the inner edges of the first and second flip cover plates squeeze each other inward, while the left and right first connecting rods 42, 32 and the first and second flip cover plates 41, 31 move downward, the rotating shafts of the left and right first connecting rods are driven by the left and right second connecting rods to move outward and downward. The upper ends of the left and right first connecting rods do not move outward under the pulling force of the left and right inner tension springs, which causes the left and right first connecting rods to tilt inward, and the first and second flip cover plates 41, 31 also slowly flip inward. When the first and second flip cover plates 41 and 31 are turned to a certain angle, the first and second flip cover plates 41 and 31 are changed from a horizontal state to an inwardly inclined state, the lower edges of the inner side edges of the first and second flip cover plates are separated, and the upper edges 18 are still closed. At the same time, the left and right inner tension springs contract, and the left and right first connecting rods gradually approach their respective left and right inner limit plates 370 and 37. The first and second flip cover plates 41 and 31 are in an inwardly inclined state. When the first and second flip cover plates 41 and 31 begin to move downward, the left and right second connecting rods 43 and 33 rotate outward and downward, and the third connecting rod and the middle connecting rod move upward. The inner ends of the left and right second connecting rods 43 and 33 and the left and right lower tension springs 45 and 35 respectively bring The lower ends of the left and right third links 44 and 34 are driven to rise, and the first and second flip covers, the left and right third links, the left and right second links 43 and 33 and the left and right lower tension springs 45 and 35 generate an upward pulling force on the middle link 8. The left and right third links 44 and 34 pull the middle link 8 upward, and the distance between the left and right second links 43 and 33 and the left and right third links is reduced, causing the distance between the upper and lower ends of the left and right lower tension springs 45 and 35 to slowly decrease, and the left and right lower tension springs 45 and 35 begin to slowly shrink. In addition, due to the obstruction of the lifting block 90, the middle link 8 rests on the bottom surface of the lifting block 90 and moves upward with the lifting block 90.When the left and right first connecting rods rotate inward and abut against the left and right inner limit plates 370 and 37, the left and right inner tension springs can no longer pull the left and right first connecting rods to rotate further inward, and the left and right first connecting rods cannot rotate inward relative to the left and right second connecting rods. Then, the left and right second connecting rods drive the left and right first connecting rods and the first and second flip cover plates to rotate outward, and the upper edges 18 of the inner edges of the first and second flip cover plates separate, thereby completely separating the inner edges of the first and second flip cover plates. The first and second flip cover plates quickly change from being tilted inward to a horizontal state. As the left and right first connecting rods continue to rotate outward, the first and second flip cover plates rotate outward along with the left and right first connecting rods. After that, the first and second flip cover plates 41 and 31 are completely separated from the opening 12 of the coffee table storage cavity 11.

[0087] When the upper ends of the left and right third links 44, 34 abut against the limit top plate 442, the left and right third links 44, 34 no longer move upward, and the left and right second links 43, 33, the left and right third links 44, 34, and the left and right first links 42, 32 also stop rotating outward (the tension of the left and right inner tension springs 46, 36 is sufficient to stop the first and second flip covers 41, 31 from flipping downward). The first and second flip covers 41, 31 are in a vertical or inclined position, and the lifting block continues to move upward. When the second limit step 22 of the coffee table abuts against the limit slot 15 of the opening of the table body, the support plate and the lifting block stop moving upward. The lifting motor then continues to drive the upper and lower nuts to continue moving upward until the lower limit switch on the lower nut touches the bottom surface of the lifting block 90, at which point the lifting motor 5 stops working and the entire mechanism stops. During this process, the lower compression spring is compressed and deformed, pressing the lifting block 90 upward, thereby ensuring that the motor does not stop until the coffee table is raised into position. During the process of the first and second flip covers 41 and 31 flipping downward and outward into the coffee table storage cavity, if the tension of the left and right inner tension springs 46 and 36 is less than the gravity of the corresponding first and second flip covers 41 and 31, the tension is insufficient to stop the left and right first connecting rods 42 and 32 from rotating downward. In this case, the left and right first connecting rods 42 and 32 will rotate downward and abut against the left outer limit plate 372 and the right outer limit plate 371, respectively. Under the action of the left and right outer limit plates 372 and 371, the left and right first connecting rods 42 and 32 will stop rotating downward.

[0088] In addition, the following situation also exists: if the tension of the left and right inner tension springs 46, 36 is not enough to stop the first connecting rods 32, 42 from rotating downward, but after the first connecting rods 32, 42 rotate downward for a certain distance, the stretching amount of the left and right inner tension springs 46, 36 increases and the tension increases, so that the first connecting rods 32, 42 can stop rotating downward and do not rest against the left and right outer limit plates 372, 371.

[0089] Example 2, as Figures 31 to 32As shown, the implementation of Example 2 is similar to that of Example 1, except that: the improved hidden lift coffee table in this embodiment has only one lift motor, which is a dual-output motor 52, and the improved hidden lift coffee table in this embodiment also includes a first gear box 65, a second gear box 64, a third gear box 63, a fourth gear box 62, a first transmission shaft 68, a second transmission shaft 69, a third transmission shaft 67, a fourth transmission shaft 66, a first lift transmission bevel gear 616, a second lift transmission bevel gear 613, a first transition bevel gear 615 and a second transition bevel gear 614, the first transmission shaft 68, the second transmission shaft 69, the third transmission shaft 67 and the fourth transmission shaft 66 are arranged in a 冂 shape, and the two output ends of the dual-output motor are respectively connected to the inner end of the first transmission shaft 68 and the inner end of the second transmission shaft 69 for transmission. The third transmission shaft 67 is provided with a first bevel gear 617 and a second bevel gear 618 at each end, respectively. The fourth transmission shaft 66 is provided with a fifth bevel gear 621 and a sixth bevel gear 622 at each end, respectively. A third gear 619 is provided at the outer end of the first transmission shaft 68, and a fourth bevel gear 620 is provided at the outer end of the second transmission shaft 69. The first transition bevel gear 615 meshes with both the second bevel gear 618 and the third gear 619, enabling transmission between the first and third transmission shafts 68 and 67. The first transition bevel gear 615, the second bevel gear 618, and the third gear 619 are rotated together within the second gearbox 64. The first lift transmission bevel gear 616 is provided at the upper end of the first lift screw 6 of the first lift drive mechanism. The first lift transmission bevel gear 616 meshes with the first bevel gear 617, driving the lift screw 6 of the first lift drive mechanism in forward or reverse rotation. The first lift transmission bevel gear 616 and the first bevel gear 617 are rotated together within the first gearbox 65.

[0090] The second intermediate bevel gear 614 meshes with the fourth bevel gear 620 and the fifth bevel gear 621 simultaneously to achieve the transmission between the second transmission rotating shaft 69 and the fourth transmission rotating shaft 66. The second lifting transmission bevel gear 613 is provided at the upper end of the second lifting lead screw 61 of the second lifting drive mechanism. The second lifting transmission bevel gear 613 meshes with the sixth bevel gear 622, thereby driving the lifting lead screw 61 of the second lifting drive mechanism to rotate forward or backward. The second intermediate bevel gear 614, the fourth bevel gear 620, and the fifth bevel gear 621 are rotatably disposed together in the third gear box 63. The second lifting transmission bevel gear 613 and the sixth bevel gear 622 are rotatably disposed together in the fourth gear box 62. The lifting motors in this embodiment drive the outer ends of the first transmission rotating shaft and the second transmission rotating shaft 69 to rotate in opposite directions respectively. The first transmission rotating shaft and the second transmission rotating shaft 69 drive the third transmission rotating shaft and the fourth transmission rotating shaft to rotate respectively, and further drive the first lifting lead screw 6 and the second lifting lead screw 61 to rotate synchronously. Finally, the synchronous lifting of the two lifting blocks is achieved, so that the two ends of the first and second flipping covers are flipped synchronously and the tea table is ensured to be lifted horizontally.

[0091] Embodiment 3, as Figures 33 to 35As shown, the third embodiment is similar to the first embodiment, except that the left and right inner tension springs 46 and 36 are eliminated from the first cover plate flip linkage mechanism 13 and the second cover plate flip linkage mechanism 14 of this embodiment. Instead, the left and right inner tension springs 46 and 36 of the first embodiment are replaced with left and right outer limit plates 372 and 371. After the first and second flip cover plates 41 and 31 are flipped into the coffee table storage cavity 11, the left and right first connecting rods 42 and 32 rotate downward and abut against the left outer limit plate 372 and the right outer limit plate 371, respectively. Under the action of the left and right outer limit plates 372 and 371, the left and right first connecting rods 42 and 32 stop rotating downward. When the first and second flip cover plates 41 and 31 flip upward and close, the outer ends of the left and right second connecting rods 43 and 33 flip upward, and the left and right first connecting rods respectively abut against the left outer limit plate 372 and the right outer limit plate 371, so that the outer ends of the left and right second connecting rods 43 can drive the left and right first connecting rods to flip upward. When the second connecting rod of this embodiment flips upward slowly, the two flip cover plates of this embodiment can also be closed together without the action of the left and right inner tension springs 46 and 36. The left and right first connecting rods of this embodiment respectively abut against the left outer limit plate 372 and the right outer limit plate 371, and the left outer limit plate 372 and the right outer limit plate 371 respectively drive their respective first connecting rods to flip upward and inward. When the two flip cover plates of this embodiment flip inward until they just touch, due to the gravity of the flip cover relative to the first connecting rod Due to the action of the torque generated by the rotating shaft, the inward turning speed of the first and second flip cover plates is greater than the inward turning speed of the second connecting rod. The first and second flip cover plates will lead the left and right first connecting rods to turn inward and detach from the left and right outer limit plates 372 and 371, and then turn toward the left and right inner limit plates 370 and 37. Then the two flip cover plates touch each other. During this process, the left and right first connecting rods may or may not rest against the left and right inner limit plates 370 and 37.

[0092] Example 4, as Figures 36 to 37As shown in the figure, the implementation method of the fourth embodiment is similar to that of the first embodiment, with the difference being that: in the first cover flipping linkage mechanism 13 and the second cover flipping linkage mechanism 14 of this embodiment, the intermediate connecting rod 8 in the first embodiment is cancelled, and the upper ends of the left and right downward pulling springs 45 and 35 are both connected to the support frame 7. At the positions corresponding to the left and right third connecting rods 44 and 34 on the support frame 7, there are left and right limit guiding holes 419 and 420. The left third connecting rod 44 is slidably arranged up and down in the left limit guiding hole 419, and the right third connecting rod 34 is slidably arranged up and down in the right limit guiding hole 420. The lower end of the left third connecting rod 44 is located below the left limit guiding hole 419, and the lower end of the right third connecting rod 34 is located below the right limit guiding hole 420. On the inner side wall of the lower end of the left third connecting rod 44, there is a left pressed convex shaft 417, and on the inner side wall of the lower end of the right third connecting rod 34, there is a right pressed convex shaft 418. The left pressed convex shaft 417 and the right pressed convex shaft 418 are located below the lifting block 90.

[0093] When the lifting motor drives the lifting block 90 and the tea table 2 to descend together, after the lifting block 90 presses down on the left pressed convex shaft 417 and the right pressed convex shaft 418, the lifting block 90 drives the lower ends of the left third connecting rod 44 and the right third connecting rod 34 to descend together. The left and right downward pulling springs 45 and 35 are stretched. The left third connecting rod 44 and the right third connecting rod 34 can only descend under the action of the left and right limit guiding holes 419 and 420, thereby driving the left and right second connecting rods 43 and 33, and the left and right first connecting rods 42 and 32 to act. The first and second flipping covers 41 and 31 flip upward and inward, and finally the first and second flipping covers 41 and 31 are closed and the opening 12 of the table body is closed. Under the pulling force of the left and right downward pulling springs 45 and 35, the lower ends of the left third connecting rod 44 and the right third connecting rod 34 tend to rise, so the left pressed convex shaft 417 and the right pressed convex shaft 418 always keep abutting against the lifting block 90.

[0094] When the lifting motor drives the lifting block 90 and the tea table 2 to rise together, under the pulling force of the left and right downward pulling springs 45 and 35, the left pressed convex shaft 417 and the right pressed convex shaft 418 rise together along with the lifting block 90. The left and right third connecting rods 44 and 34 respectively drive the left and right second connecting rods 43 and 33 and the left and right first connecting rods 42 and 32 to act. The first and second flipping covers 41 and 31 flip upward and inward. When the left pressed convex shaft 417 and the right pressed convex shaft 418 rise to the left limit guiding hole 419 and the right limit guiding hole 420, the lower ends of the left third connecting rod 44 and the right third connecting rod 34 stop rising, the left and right second connecting rods 43 and 33, and the left and right first connecting rods 42 and 32 stop acting, and the first and second flipping covers 41 and 31 stop rotating. The lifting motor drives the lifting block 90 and the tea table 2 to continue rising. After that, the tea table 2 rises in place, and the lifting block 90 also stops rising.

[0095] Embodiment 5, as Figures 38 to 40 shown, the implementation manner of Embodiment 5 is similar to that of Embodiment 1, and the differences are as follows: the left and right lower pull springs 45, 35 and the middle connecting rod 8 in Embodiment 1 are cancelled in the first cover plate flipping linkage mechanism 13 and the second cover plate flipping linkage mechanism 14 of this embodiment, and the structure of the lifting block in this embodiment is different from that of the lifting block in Embodiment 1. In this embodiment, symmetrically arranged left and right fourth connecting rods 411, 412 are used to replace the left and right lower pull springs 45, 35 respectively to drive the rotation of multiple connecting rods. The left fourth connecting rod 411 and the right fourth connecting rod 412 are rotatably arranged on the left and right sides of the lifting block on the support frame 7 respectively. The left fourth connecting rod 411 and the right fourth connecting rod 412 are in a Y shape. The first end of the left fourth connecting rod 411 is rotatably connected to the support frame 7, and the first end of the right fourth connecting rod 412 is rotatably connected to the support frame 7. The lower end of the left third connecting rod 44 is rotatably connected to the left fourth connecting rod 411, and the lower end of the right third connecting rod 34 is rotatably connected to the right fourth connecting rod 412. The second end and the third end of the left fourth connecting rod 411 are bifurcated, and the second end and the third end of the right fourth connecting rod 412 are bifurcated. The inner side wall of the third end of the left fourth connecting rod 411 is provided with a left pressure receiving convex shaft 413, and the inner side wall of the third end of the right fourth connecting rod 412 is provided with a right pressure receiving convex shaft 414. The left pressure receiving convex shaft 413 and the right pressure receiving convex shaft 414 are located below the lifting block 90. The outer side wall of the lifting block 90 is provided with a left flipping linkage convex shaft 415 and a right flipping linkage convex shaft 416.

[0096] When the lifting motor drives the lifting block 90 and the tea table 2 to descend together, after the lifting block 90 presses down on the left pressure receiving convex shaft 413 and the right pressure receiving convex shaft 414, the lifting block 90 drives the second end and the third end of the left fourth connecting rod 411 and the second end and the third end of the right fourth connecting rod 412 to rotate downward together, thereby driving the left and right third connecting rods 44, 34, the left and right second connecting rods 43, 33, and the left and right first connecting rods 42, 32 to act. The first and second flipping cover plates 41, 31 flip upward and inward, and finally the first and second flipping cover plates 41, 31 are closed and the opening 12 of the table body is closed. At the same time, the left fourth connecting rod 411 and the right fourth connecting rod 412 rotate to the lowest point, and the left flipping linkage convex shaft 415 is between the second end and the third end of the left fourth connecting rod 411, and the right flipping linkage convex shaft 416 is between the second end and the third end of the right fourth connecting rod 412.

[0097] On the contrary, when the lifting motor drives the lifting block 90 and the tea table 2 to rise together, the left flipping linkage convex shaft 415 and the right flipping linkage convex shaft 416 respectively lift the second ends of the left fourth link 411 and the right fourth link 412, thereby driving the second ends and the third ends of the left fourth link 411 and the right fourth link 412 to rotate upward, and further driving the left and right third links 44, 34, the left and right second links 43, 33, and the left and right first links 42, 32 to act. After that, the left flipping linkage convex shaft 415 and the right flipping linkage convex shaft 416 respectively disengage from the second ends of the left fourth link 411 and the right fourth link 412, and the first and second flipping covers 41, 31 flip downward and outward, and finally the first and second flipping covers 41, 31 are separated and the opening 12 of the table body is opened.

Claims

1. A hidden lifting tea table, comprising a table body, a tea table top, two flipping covers, a lifting motor and a cover flipping linkage mechanism. The cover flipping linkage mechanism includes a support frame, a lifting lead screw, a lifting block and two cover flipping components symmetrically arranged on the left and right sides of the lifting block. The lifting lead screw is vertically arranged on the table body, the lifting block is slidably arranged up and down on the lifting lead screw, the tea table top is fixedly connected to the lifting block, the lifting motor and the support frame are arranged on the table body, and the lifting motor drives the lifting lead screw to rotate. It is characterized in that, The cover plate flipping assembly includes a first connecting rod, a second connecting rod, and a third connecting rod. The second connecting rod is rotatably arranged on the support frame. The bottom end of the first connecting rod is rotatably connected to the outer end of the second connecting rod. Two flipping cover plates are respectively arranged at the top ends of the first connecting rods of two cover plate flipping assemblies. The inner end of the second connecting rod is rotatably connected to the upper end of the third connecting rod. The second connecting rod is provided with an inner limiting plate on the inner side of the first connecting rod. An inner tension spring is arranged between the first connecting rod and the second connecting rod, or the outer end of the second connecting rod is provided with an outer limiting plate on the outer side of the first connecting rod. When the lifting block descends and drives the third connecting rods of the two cover plate flipping assemblies to move downward together, the two flipping cover plates first flip towards each other and close below the opening of the table body, and then the two flipping cover plates rise together into the opening of the table body.

2. The hidden lift tea table according to claim 1, wherein The cover plate flipping linkage mechanism further includes an anti-cover plate pinching assembly. The anti-cover plate pinching assembly includes an upper screw nut, a lower screw nut, an upper compression spring, and a lower compression spring. The thread rotation direction of the lower screw nut is the same as that of the upper screw nut. The upper screw nut and the lower screw nut are arranged on the lifting screw rod and are threadedly connected to the lifting screw rod. The lifting block is located between the upper screw nut and the lower screw nut. The upper compression spring is arranged between the upper screw nut and the lifting block. The lower compression spring is arranged between the lower screw nut and the lifting block.

3. The hidden lifting tea table according to claim 1, characterized in that, The cover plate flipping assembly further includes a lower tension spring. The lower end of the lower tension spring is connected to the third connecting rod, and the upper end of the lower tension spring is connected to a position with a horizontal height higher than the lower end of the lower tension spring.

4. The hidden lifting tea table according to claim 1, characterized in that, The cover plate flipping linkage mechanism further includes an intermediate connecting rod. The intermediate connecting rod is horizontally arranged on the support frame and is located below the lifting block. The intermediate connecting rod is slidably arranged up and down on the support frame. The lower ends of the third connecting rods of the two cover plate flipping assemblies are both rotatably connected to the intermediate connecting rod.

5. The hidden lift tea table according to claim 1, characterized in that, The cover plate flipping linkage mechanism further includes an intermediate connecting rod. The intermediate connecting rod is horizontally arranged on the support frame and is located below the lifting block. The intermediate connecting rod is slidably arranged up and down on the support frame. The lower ends of the third connecting rods of the two cover plate flipping assemblies are both rotatably connected to the intermediate connecting rod. The cover plate flipping assembly further includes a lower tension spring. The lower end of the lower tension spring is connected to the intermediate connecting rod, and the upper end of the lower tension spring is connected to a position with a horizontal height higher than the lower end of the lower tension spring.

6. The hidden lifting tea table according to claim 2, characterized in that, An upper limit switch is arranged on the upper screw nut, and a lower limit switch is arranged on the lower screw nut.

7. The hidden lift tea table according to claim 1, characterized in that, The outer end of the second connecting rod is provided with an outer limiting plate on the outer side of the first connecting rod.

8. The hidden lifting tea table according to claim 1, characterized in that, A limiting top plate is arranged on the support frame, and the limiting top plate is located above the third connecting rod.

9. The hidden lifting tea table according to claim 4 or 5, characterized in that, The intermediate connecting rod is provided with a positioning groove corresponding to the position of the lifting block.

10. The hidden lift tea table according to claim 4 or 5, characterized in that, Lifting balance guide rails are arranged along the vertical direction on the left and right sides of the support frame, and the intermediate connecting rod is slidably arranged up and down on the lifting balance guide rails.

11. The hidden lifting tea table according to claim 2, characterized in that, The upper screw nut, the lifting block, and the lower screw nut are connected by a hollow pin and a screw. The end of the hollow pin is provided with a threaded hole. The hollow pin passes through the upper screw nut, the lifting block, and the lower screw nut, and the threaded hole of the hollow pin is connected to the screw.

12. The hidden lifting tea table according to claim 1, characterized in that, It further includes a fixing plate. A fixed bearing is arranged at the bottom end of the lifting screw rod, and the fixed bearing is arranged on the bearing seat of the fixing plate.

13. The hidden lifting tea table according to claim 1, characterized in that, The transmission gears are connected to the transmission gears of the first transmission shaft and the transmission gears are connected with the transmission gears of the second transmission shaft to form a gearbox.

14. The hidden lifting tea table according to claim 1, characterized in that, The two ends and / or outer edges of the flip cover are provided with first limiting steps, the two ends and / or both sides of the coffee table are provided with second limiting steps, the table body is provided with a coffee table storage cavity for accommodating the coffee table, the table top of the table body is provided with the opening corresponding to the coffee table storage cavity, and the side wall of the opening is provided with a limiting groove corresponding to the position of the first limiting step.

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