Desk with automatically telescopic desk box and height-adjustable desk board

Abstract

The invention relates to the field of desks, and discloses a desk with an automatic telescopic desk box and an adjustable desk board height, which comprises a desk board, a desk box and a desk leg assembly, and the desk leg assembly comprises desk legs arranged on two sides of the desk box in parallel; each table leg comprises a supporting leg abutting against the ground, a fixing pipe vertically fixed to the supporting leg and telescopic pipes stretching out and drawing back in the fixing pipe and driving the table plate to ascend and descend along with stretching out and drawing back, a connecting pipe is connected between the two telescopic pipes, and the table box is fixed to the lower end of the table plate and provided with storage boxes used for storage in a drawing mode and perpendicular to the two side walls of the sitting position. Lifting of the table legs and storage of the storage box are synchronously controlled by a linkage switching driving assembly, and the linkage switching driving assembly comprises a driving assembly located in the connecting pipe, a telescopic driving assembly located between the table legs and the connecting pipe and a push-pull driving assembly located among the table box, the storage box and the connecting pipe. According to the desk, lifting of the desk plate and automatic stretching of the storage box can be achieved, and the two functions do not interfere with each other.

Description

Technical Field

[0001] The invention relates to the field of desks, and in particular to a desk with an automatically retractable desk box and an adjustable height desk board. Background Art

[0002] Existing desks generally include table tops, desk boxes and table legs. The height adjustment of the desks and the convenience of taking books and stationery from the desk boxes are the focus of desk performance research and development. Applying automation technology to the research and development of these performances is the current research and development focus.

[0003] The height adjustment of the desk is generally achieved by adjusting the length of the table legs. Please refer to the Chinese patent publication No. CN217609966U for an electric lift table and an integrated control system. The table legs include a rectangular tube and a lifting tube that is lifted therein. The lifting of the lifting tube is controlled by a driving mechanism. The driving mechanism includes a motor, a screw and a sleeve. The motor drives the screw to rotate, and then drives the lifting tube to lift relative to the rectangular tube through the sleeve.

[0004] The existing desk boxes include side-opening desk boxes and top-opening desk boxes. The side-opening desk box can refer to the desk disclosed in Chinese patent publication No. CN109953498B, and the table body of the desk includes a table top plate and a table drawer frame, and the table top plate and the table drawer frame form a side-opening desk box with an opening facing the student; the top-opening desk box can refer to a flip desk disclosed in Chinese patent publication No. CN217065707U, and the table body of the desk includes a storage cavity and a hinged flip cover, which is folded down to form a horizontal table board, and the storage cavity is a desk box for placing books and stationery.

[0005] After placing books in the side-opening desk box, students need to bend down to look for them, and their vision is blocked, which makes it inconvenient to find books. For the flip-top desk, the books originally piled on the desk need to be moved away first before the desk can be flipped up to look for them, which still makes it inconvenient to find books.

[0006] Therefore, it is very necessary to design a desk with automatic lifting function of the table top and convenient for finding books in the desk box. Summary of the invention

[0007] The present invention aims at the shortcomings of the prior art desks that they do not have the functions of automatic lifting and convenient book finding, and provides a desk with an automatically retractable desk box and an adjustable desk top.

[0008] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0009] A desk with an automatically retractable desk box and an adjustable desk board, comprising a desk board, a desk box fixed to the lower end surface of the desk board, and a table leg assembly connected to the desk board, wherein the table leg assembly comprises table legs arranged in parallel on both sides of the desk box, the table legs comprising supporting feet abutting against the ground, fixed tubes vertically fixed to the supporting feet, and telescopic tubes telescopic in the fixed tubes and driving the desk board to rise and fall with telescopic movement, a connecting tube being connected between the two telescopic tubes, the desk box being provided with storage boxes for storage vertically on both sides of the seating area, the lifting and lowering of the table legs and the storage of the storage boxes being synchronously controlled by a linkage switching drive assembly, the linkage switching drive assembly comprising a drive assembly located in the connecting tube , a telescopic drive component located between the table legs and the connecting tube, and a push-pull drive component located between the table box, the storage box and the connecting tube. The drive assembly includes two coaxially arranged forward and reverse screw rods with opposite thread directions. The forward and reverse screw rods are rotatably arranged in the connecting tube through a bearing seat and are synchronously controlled by a double-output shaft motor located between the two. A first disconnecting mechanism that can connect or disconnect the two is provided between the telescopic drive component and the forward and reverse screw rods. A second disconnecting mechanism that can connect or disconnect the two is provided between the push-pull drive component and the forward and reverse screw rods. When the first disconnecting mechanism is connected, the second disconnecting mechanism is disconnected; when the first disconnecting mechanism is disconnected, the second disconnecting mechanism is connected.

[0010] By adopting the above scheme, the table top can be raised and lowered by the table leg assembly, and the storage boxes arranged on both sides of the seating position can be pulled out to find books or stationery in the storage boxes without bending over or flipping up the table tops. By setting the linkage switching drive assembly, the automatic raising and lowering of the table top and the automatic extension and retraction of the storage box can be realized. When the table top is raised and lowered, the storage box remains stationary; when the storage box is extended and retracted, the table top remains stationary. The two functions do not interfere with each other. A dual-output shaft motor is used for driving, and the first disconnecting mechanism and the second disconnecting mechanism can be used to realize the mutual switching between the two functions. The structure is very clever.

[0011] Preferably, the telescopic drive assembly includes a fixed screw, which is vertically arranged and has its bottom fixed to the bottom of the fixed tube. A rotating sleeve is rotatably arranged in the telescopic tube for the fixed screw to pass through. A driven bevel gear for the fixed screw to pass through is concentrically fixed to the upper end of the rotating sleeve. A first nut threadedly connected to the fixed screw is fixed to the lower end of the rotating sleeve. A connecting shaft is rotatably arranged at both ends of the connecting tube. A driving bevel gear meshing with the driven bevel gear is concentrically fixed to one end of the connecting shaft located at the telescopic tube. A first disconnecting mechanism is arranged between one end of the connecting shaft located in the connecting tube and the ends of the forward and reverse screws close to it.

[0012] By adopting the above scheme, when the driving bevel gear rotates, the driven bevel gear, the rotating sleeve and the first nut are driven to rotate. Since the fixed screw is fixed in the fixed tube, the telescopic tube can achieve vertical lifting movement relative to the fixed tube.

[0013] Preferably, the first disconnecting mechanism includes a receiving groove with a regular polygonal cross-section which is recessed at the end of the connecting shaft away from the driving bevel gear, a limiting groove which is recessed at the end of the positive and negative screw rods opposite to the connecting shaft and has the same shape as the receiving groove, and a limiting block elastically and telescopically arranged in the receiving groove, a first spring is arranged in the receiving groove which drives the limiting block to partially extend and engage with the limiting groove under normal conditions, and a driving locking mechanism is arranged between the limiting block and the connecting tube which drives the limiting block to disengage from the limiting groove and simultaneously locks the connecting shaft and the connecting tube.

[0014] By adopting the above scheme, when the limit block is extended, the connection between the forward and reverse screw rods and the connecting shaft is realized and the two cannot deflect relative to each other; when the limit block is retracted, it is disengaged from the forward and reverse screw rods and connected to the connecting tube to limit the rotation of the connecting shaft relative to the connecting tube, thereby realizing self-locking of the driving bevel gear.

[0015] Preferably, the driving locking mechanism comprises a tapered sleeve which is sleeved outside the connecting shaft and whose diameter gradually increases from the end close to the positive and negative screw rods to the end away from the same, avoidance grooves which are opened on both sides of the connecting shaft along the axial direction, and a connecting block which passes through the avoidance grooves and whose two ends are respectively fixed to the end of the limit block away from the limit groove and the inner wall of the tapered sleeve, a plurality of tooth grooves are evenly spaced in the circumferential direction on the outer ring wall of the tapered sleeve at the end away from the positive and negative screw rods, and a spring which is telescopically arranged on the inner wall of the connecting tube and squeezes the tapered sleeve as it extends and drives the limit block to the direction of the compression spring. The locking block moves in the direction of the axis, and the lower surface of the locking block is arranged as an inclined arc surface that fits with the surface of the cone sleeve, and the inclined arc surface is away from the end of the positive and negative screw rods and is spaced around its arc direction with limiting teeth that mesh with the tooth groove when the limit block is completely separated from the limiting groove. The extension and contraction of the locking block is controlled by the power on or off of the first electromagnet. A groove is concavely provided on the inner wall of the connecting tube, and the first electromagnet is fixed at the bottom of the groove. A second spring with two ends respectively fixed to the bottom of the groove and the first electromagnet is arranged between the bottom of the groove and the first electromagnet, and the elastic force of the second spring is greater than the elastic force of the first spring.

[0016] By adopting the above scheme, the cone sleeve and the limit block are connected by the connecting block to realize synchronous telescopic movement, and the inclined arc surface of the locking block makes it press against the cone sleeve after power failure and force the cone sleeve to move to the end away from the positive and negative screw rods until the limit tooth is engaged with the tooth groove. The limit block moves synchronously with the cone sleeve and completely disengages from the positive and negative screw rods before the limit tooth is engaged with the tooth groove. The extension and retraction of the locking block is realized by the power on or off of the first electromagnet. When the first electromagnet is energized, the locking block retracts, and the limit block partially extends under the action of the reset force of the first spring to engage with the limit groove; when the first electromagnet loses power, the locking block extends under the action of the second spring, drives the cone sleeve to retreat, and makes the limit block synchronously retreat and disengage from the limit groove.

[0017] Preferably, the push-pull drive assembly includes a driving slider screwed on the forward and reverse screw rods respectively, a guide connecting rod passing through the connecting tube and driving the driving slider to slide along the length direction of the connecting tube, a push block passing through the table box and connected to the outer wall of the storage box on the side away from the opening and can be guided to slide along the pulling direction of the storage box, and a connecting rod to realize the connection between the guide connecting rod and the push block, a second nut screwed to the forward and reverse screw rods is provided in the center hole of the driving slider, and a second disconnecting mechanism is provided between the driving slider, the second nut, the storage box and the table box.

[0018] By adopting the above scheme, when the double-output shaft motor drives the forward and reverse screw rods to rotate, the two driving sliders can be synchronously moved closer or farther away from each other. When the two are relatively close, the push block pulls the storage box inward, allowing the storage box to enter the table box; when the two are relatively far away, the push block pushes the storage box outward, causing the storage box to partially slide out of the table box.

[0019] Preferably, the second disconnecting mechanism includes a sliding mechanism which is arranged between the second nut and the driving slider and which keeps the two in a locked state under normal circumstances and switches the two to relative rotational cooperation after the torque between the two exceeds a preset value. A locking mechanism is arranged in the desk box to lock the storage box after it moves to the maximum stroke into the desk box.

[0020] By adopting the above scheme, after the locking mechanism locks the storage box, the movement of the push block is restricted, causing torque to appear between the second nut and the driving slider. When the torque is greater than a preset value, the second nut can slip relative to the driving slider, and the second nut switches from axial movement relative to the forward and reverse screw rods to synchronous rotation with the forward and reverse screw rods.

[0021] Preferably, the slipping structure includes an installation groove recessed in the inner wall of the center hole of the driving slider, a locking groove recessed on the outer ring wall of the nut, a locking block that can be fully retracted into the installation groove or partially extended out of the installation groove and plugged into the locking groove, a third spring is arranged in the installation groove to drive the locking block to a partially extended state, and the locking block is provided with guide inclined surfaces on both sides of the circumference of the nut to facilitate the locking block to slide into or out of the locking groove.

[0022] By adopting the above scheme, when the torque is greater than the preset value, the locking block overcomes the elastic force of the third spring and retracts. After disengaging from the locking groove, the driving slider and the second nut are unlocked, and the second nut can rotate synchronously with the forward and reverse screws, while the driving slider is in a stationary state.

[0023] Preferably, the locking mechanism includes a mounting block protruding from a side opposite to the two storage boxes and having a slot at the bottom, an assembly box fixed to the middle of the bottom surface of the desk box, and a locking block vertically elastically extended and retracted at the upper end of the assembly box and capable of being simultaneously plugged into the slots of the two mounting blocks after being extended, the locking block being provided with a matching inclined surface which causes the mounting block to first retract and then reset and insert into the slot when the mounting block approaches the locking block with a pressure exceeding a preset pressure, a second electromagnet being fixed in the assembly box, a fourth spring being provided between the second electromagnet and the locking block and having its two ends fixed to the two, and the extension and retraction of the locking block being controlled by the power on or off of the second electromagnet.

[0024] By adopting the above scheme, when the second electromagnet is energized, the locking block retracts and synchronously disengages from the two mounting blocks, and the two storage boxes are synchronously unlocked from the desk box. At this time, the pushing block can push and pull the storage boxes; when the second electromagnet loses power, the locking block partially extends and synchronously engages with the slots of the two mounting blocks. The two storage boxes are synchronously locked with the desk box, and the pushing block cannot move.

[0025] Preferably, a third electromagnet is embedded on the side of the push block opposite to the storage box, an iron insert that can be attracted by the energized third electromagnet is embedded on the storage box, a pull rod extends vertically from the lower end of the locking block and passes through the lower surface of the table box, and a pull ring is fixed on the opposite side of the storage box.

[0026] By adopting the above scheme, the push block is magnetically fixedly connected with the storage box through the third electromagnet. When power is off, the push block and the storage box lose connection. By pulling the pull rod downward, the storage box and the desk box can be unlocked, and the storage box can be pulled outward through the pull ring. The above manual operation method can temporarily replace the electric operation method.

[0027] Preferably, the telescopic tube includes an intermediate tube section whose bottom is inserted into the fixed tube and an upper tube section whose upper end is fixed to the lower end of the table top and the lower end is sleeved outside the intermediate tube section. The connecting tube is fixedly connected to the middle parts of the two intermediate tube sections. A set of telescopic drive components is arranged between the upper tube section and the intermediate tube section and between the fixed tube and the intermediate tube section. The driven bevel gears in the two sets of telescopic drive components are synchronously meshed with the same driving bevel gear, and the fixed tube and the upper tube section are synchronously approached or moved away from the intermediate tube section with the forward and reverse rotation of the driving bevel gear. The connecting connecting rod is a telescopic rod. The fixed section of the telescopic rod is fixed to the guide connecting rod, and the telescopic section of the telescopic rod is fixed to the end of the push block outside the table box.

[0028] By adopting the above scheme, the telescopic tube becomes the middle tube section and the upper tube section, and the table top and the table box can both rise relative to the middle tube section, and the middle tube section can also rise relative to the fixed tube at the same time. This is achieved by two sets of telescopic drive components driven by the same driving gear, and the connecting rod is used to adapt to the change in the height position between the table box and the connecting rod. The above structure can significantly increase the lifting stroke of the desktop and improve the lifting speed without adding a driving mechanism.

[0029] The present invention has significant technical effects due to the adoption of the above technical scheme: the table top can be raised and lowered by the table leg assembly, and the storage boxes arranged on both sides of the seating position can be pulled out to find books or stationery in the storage boxes without bending over or flipping up the table tops, and the automatic raising and lowering of the table top and the automatic extension and retraction of the storage box are realized by setting the linkage switching drive assembly, and the storage box remains stationary when the table top is raised and lowered; and the table top remains stationary when the storage box is extended and retracted, and the two functions do not interfere with each other. A double-output shaft motor is used for driving, and the first disconnecting mechanism and the second disconnecting mechanism are used to realize the mutual switching between the two functions, and the structure is very ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a front view of a desk with an automatically retractable desk box and an adjustable desk top in Example 1;

[0031] Figure 2 yes Figure 1 AA cross-sectional view;

[0032] Figure 3 yes Figure 2 A magnified image of A;

[0033] Figure 4 is a front view of the connecting shaft with the driving bevel gear of Example 1 assembled with the first disconnection mechanism;

[0034] Figure 5 It is a left side view of the connecting shaft with the driving bevel gear of Example 1 assembled with the first disconnection mechanism;

[0035] Figure 6 is an isometric view of the first disconnecting mechanism assembled on the connecting shaft with the driving bevel gear of Example 1;

[0036] Figure 7 yes Figure 2 A cross-sectional view of BB;

[0037] Figure 8 yes Figure 7 A cross-sectional view of CC;

[0038] Fig. 9 yes Figure 8 A magnified view of B;

[0039] Fig.10 This is a front view of a desk with an automatically retractable desk box and an adjustable desk top height according to Embodiment 2;

[0040] Fig.11 yes Fig.10 A cross-sectional view of DD;

[0041] Fig.12 yes Fig.11 An enlarged view of C.

[0042] The parts indicated by the numbers in the above drawings are as follows: 1. Table top; 2. Table box; 201. First blocking block; 3. Storage box; 301. Second blocking block; 4. Pull ring; 5. Table leg; 51. Support foot; 52. Fixed tube; 53. Telescopic tube; 531. Middle tube section; 532. Upper tube section; 6. Connecting tube; 7. Double-axis motor; 8. Positive and negative screw rod; 801. Limiting groove; 9. Driving slider; 10. Second nut; 1001. Locking groove; 11. Mounting groove; 12. Locking block; 121. Guide slope; 13. Third spring; 14. Guide connecting rod; 15. Connecting connecting rod; 151. Fixed section; 152. Telescopic section; 16. Push block; 17. The third electromagnet; 18. The iron insert; 19. The mounting block; 191. The slot; 20. The roller; 21. The fixing screw; 22. The rotating sleeve; 23. The first nut; 24. The driven bevel gear; 25. The driving bevel gear; 26. The connecting shaft; 261. The accommodating groove; 262. The avoiding groove; 27. The limiting block; 28. The first spring; 29. ​​The cone sleeve; 291. The tooth groove; 30. The connecting block; 31. The extrusion locking block; 311. The oblique arc surface; 312. The limiting tooth; 32. The first electromagnet; 33. The second spring; 34. The assembly box; 35. The locking block; 351. The matching inclined surface; 36. The fourth spring; 37. The pull rod; 38. The buckle; 39. The second electromagnet. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] Example 1

[0045] A desk with an automatically retractable desk box and an adjustable desk top, combined with Figure 1-Figure 9 As shown, it includes a table top 1, a table box 2 fixed to the lower end surface of the table top 1, and a table leg assembly connected to the table top 1, the table leg assembly includes table legs 5 arranged in parallel on both sides of the table box 2, the table legs 5 include supporting feet 51 abutting the ground, fixed tubes 52 vertically fixed on the supporting feet 51, and telescopic tubes 53 telescopically extended in the fixed tubes 52 and driving the table top 1 to rise and fall with the extension and retraction, the fixed tubes 52 and the telescopic tubes 53 are located on the side of the lower end of the table top 1 away from the seating position, and are staggered with the table box 2, the supporting feet 51 extend to both sides of the table top 1 to increase the stability of the support, a connecting tube 6 is connected between the two telescopic tubes 53, the cross-sections of the fixed tubes 52, the telescopic tubes 53 and the connecting tubes 6 are all rectangular, the table box 2 is vertically provided with storage boxes 3 for storage on both sides of the seating position, the lifting and lowering of the table legs 5 and the storage of the storage boxes 3 are synchronously controlled by a linkage switching drive assembly.

[0046] The linkage switching drive component includes a drive assembly located in the connecting tube 6, a telescopic drive component located between the table legs 5 and the connecting tube 6, and a push-pull drive component located between the table box 2, the storage box 3 and the connecting tube 6.

[0047] Reference Figure 2-Figure 3 As shown, the driving assembly includes two coaxially arranged forward and reverse screw rods 8 with opposite thread directions. The forward and reverse screw rods 8 are rotatably arranged in the connecting tube 6 through a bearing seat and are synchronously controlled by a double-output shaft motor 7 located therebetween. The double-output shaft motor 7 is fixedly installed in the middle of the connecting tube 6 and the two ends of its motor shaft are respectively fixedly connected to the ends of the two forward and reverse screw rods 8. A first disconnecting mechanism that can connect or disconnect the two is provided between the telescopic driving component and the end of the forward and reverse screw rods 8 away from the double-output shaft motor 7. A second disconnecting mechanism that can connect or disconnect the two is provided between the push-pull driving component and the end of the forward and reverse screw rods 8 away from the double-output shaft motor 7. When the first disconnecting mechanism is connected, the second disconnecting mechanism is disconnected; when the first disconnecting mechanism is disconnected, the second disconnecting mechanism is connected.

[0048] The telescopic drive assembly includes a fixed screw 21, which is vertically arranged and has its bottom fixed on the inner bottom surface of the fixed tube 52. A rotating sleeve 22 is rotatably arranged in the telescopic tube 53 for the fixed screw 21 to pass through. Both ends of the rotating sleeve 22 are rotatably connected to the telescopic tube 53 through bearing seats. A driven bevel gear 24 for the fixed screw to pass through is concentrically fixed to the upper end of the rotating sleeve 22. A first nut 23 threadedly connected to the fixed screw 21 is fixed to the lower end of the rotating sleeve 22. A connecting shaft 26 is rotatably arranged at both ends of the connecting tube 6. The connecting shaft 26 is located at one end of the telescopic tube 53 and is concentrically fixed with a driving bevel gear 25 meshing with the driven bevel gear 24. A first disconnecting mechanism is provided between one end of the connecting shaft 26 located in the connecting tube 6 and the end of the forward and reverse screw rods 8 close thereto.

[0049] Combination Figure 3-Figure 6As shown, the first disconnection mechanism includes a receiving groove 261 with a regular polygonal cross section which is recessed at one end of the connecting shaft 26 away from the driving bevel gear 25, a limiting groove 801 which is recessed at one end of the forward and reverse screw rods 8 facing the connecting shaft 26 and has the same shape as the receiving groove 261, and a limiting block 27 which is elastically and telescopically arranged in the receiving groove 261. A first spring 28 is arranged in the receiving groove 261 to drive the limiting block 27 to partially extend and be plugged into the limiting groove 801 in normal state. A driving locking mechanism is provided between the block 27 and the connecting tube 6 to drive the limit block 27 to disengage from the limit groove 801 and realize the locking of the connecting shaft 26 and the connecting tube 6 at the same time. The driving locking mechanism includes a tapered sleeve 29 which is sleeved outside the connecting shaft 26 and has a gradually increasing diameter from the end close to the positive and negative screw rods 8 to the end away from the positive and negative screw rods 8, an avoidance groove 262 which is opened along the axial direction on both sides of the connecting shaft 26, and a tapered sleeve 29 which passes through the avoidance groove 262 and has two ends respectively connected to the limit block 27 away from the limit groove 801. The connecting block 30 is fixed to one end of the cone sleeve 29 and the inner wall of the cone sleeve 29. A plurality of tooth grooves 291 are evenly spaced in the circumferential direction on the outer ring wall of the cone sleeve 29 at the end away from the positive and negative screw rods 8. An extrusion locking block 31 is telescopically arranged on the inner wall of the connecting tube 6, which is extended to extrude the cone sleeve and drive the limit block 27 to move in the direction of the compression spring. The lower surface of the extrusion locking block 31 is arranged to be an inclined arc surface 311 that fits the surface of the cone sleeve 29, and the end of the inclined arc surface 311 away from the positive and negative screw rods 8 is wound around The arc direction is provided with limiting teeth 312 which mesh with the tooth groove 291 when the limiting block 27 is completely separated from the limiting groove 801. The extension and retraction of the extrusion locking block 31 is controlled by the power on or off of the first electromagnet 32. A groove is concavely provided on the inner wall of the connecting tube 6. The first electromagnet 32 ​​is fixed at the bottom of the groove. A second spring 33 is provided between the bottom of the groove and the first electromagnet 32, with both ends respectively fixed to the two. The elastic force of the second spring 33 is greater than the elastic force of the first spring 28.

[0050] Reference Figure 2 As shown, the push-pull drive assembly includes a driving slider 9 respectively screwed on the forward and reverse screw rods 8, a guide connecting rod 14 passing through the connecting tube 6 and driving the driving slider 9 to slide along the length direction of the connecting tube 6, a push block 16 passing through the table box 2 and connected to the outer wall of the storage box 3 on the side away from the opening and can slide along the pulling direction of the storage box 3, and a connecting connecting rod 15 to realize the connection between the guide connecting rod 14 and the push block 16. A second nut 10 screwed to the forward and reverse screw rods 8 is arranged in the center hole of the driving slider 9, and a second disconnecting mechanism is arranged between the driving slider 9, the second nut 10, the storage box 3 and the table box 2.

[0051] Combination Figure 7-Figure 9As shown, the second disconnection mechanism includes a sliding mechanism arranged between the second nut 10 and the driving slider 9, which makes the two in a locked state in normal state and switches the two to relative rotation cooperation after the torque between the two exceeds a preset value, and a locking mechanism is arranged in the table box 2 to achieve locking when the storage box 3 moves to the maximum stroke in the table box 2. The sliding structure includes a mounting groove 11 recessed on the inner wall of the central hole of the driving slider 9, a locking groove 1001 recessed on the outer ring wall of the nut, a locking block 12 that can be fully retracted into the mounting groove 11 or partially extended from the mounting groove 11 and plugged into the locking groove 1001, a third spring 13 is arranged in the mounting groove 11 to drive the locking block 12 to be in a partially extended state, and the locking block 12 is provided with guiding inclined surfaces 121 on both sides of the nut circumference to facilitate its sliding into or out of the locking groove 1001. The locking mechanism includes a mounting block 19 which is protruded on one side opposite to the two storage boxes 3 and has a slot 191 at the bottom, an assembly box 34 fixed to the middle of the inner bottom surface of the desk box 2, and a locking block 35 which is vertically elastically retracted at the upper end of the assembly box 34 and can be simultaneously plugged into the slots 191 of the two mounting blocks 19 after being extended. The locking block 35 is provided with a matching inclined surface 351 which causes the mounting block 19 to first retract and then reset and insert into the slot 191 when the mounting block 19 approaches it with a pressure exceeding a preset pressure. A second electromagnet 39 is fixed in the assembly box 34, and a fourth spring 36 is provided between the second electromagnet 39 and the locking block 35 with both ends fixed to the two. The extension and retraction of the locking block 35 is controlled by the power on or off of the second electromagnet 39.

[0052] Combination Figure 8 As shown, a third electromagnet 17 is embedded on the side of the push block 16 opposite to the storage box 3, an iron insert 18 which can be attracted by the energized third electromagnet 17 is embedded on the storage box 3, a pull rod 37 vertically extends from the lower end of the locking block 35 and passes through the lower surface of the table box 2, a pull buckle 38 is hinged at the bottom of the pull rod 37, and a pull ring 4 is fixed on the opposite side of the storage box 3.

[0053] A first blocking block 201 is protruding upward from the opening of the desk box 2, and a second blocking block 301 is protruding downward from the end of the storage box 3 away from the clamping ring. Rollers 20 are provided on the first blocking block 201 and the second blocking block 301. The roller 20 of the first blocking block 201 is rotatably abutted against the bottom of the storage box 3, and the roller 20 of the second blocking block 301 is rotatably abutted against the bottom surface of the desk box 2. A first sensor (not shown) for identifying that the storage box 3 moves inward or outward to the maximum stroke is provided in the desk box 2, and a second sensor (not shown) for identifying that the table board 1 is raised or lowered to the maximum stroke is provided in the table leg 5.

[0054] The above-mentioned first electromagnet 32, second electromagnet 39, third electromagnet 17, first sensor, second sensor and double-axis motor 7 are synchronously connected to a PLC, and the opening and closing and switching of the above-mentioned components are realized by the logic programming of the PLC. When the table top 1 rises or falls to the maximum stroke, the controller controls the double-axis motor 7 to stop; when the storage box moves inward or outward to the maximum stroke, the controller controls the double-axis motor 7 to stop.

[0055] The steps of lifting and lowering the table top 1 are as follows: the first electromagnet 32 ​​is energized to realize the connection between the connecting shaft 26 and the forward and reverse screw rods 8, and the second electromagnet 39 and the third electromagnet 17 remain in a de-energized state, that is, the second nut 10 and the driving slider 9 are switched to a slipping state, the double-output shaft motor 7 is started, and the telescopic tube 53 performs a lifting movement relative to the fixed tube 52, and the table top 1 is lifted and lowered.

[0056] The steps for extending and retracting the desk box 2 are as follows: the second electromagnet 39 and the third electromagnet 17 are energized, the storage box 3 and the desk box 2 are unlocked, and the push block 16 and the storage box 3 are magnetically fixed, the first electromagnet 32 ​​loses power, the connecting shaft 26 is disengaged from the forward and reverse screw rods 8, and the connecting shaft 26 and the connecting tube 6 are switched to a locked state, the double-output shaft motor 7 is started and the double-output shaft motor 7 is rotated forward (when set to forward, the driving slider 9 moves relatively away), and the storage box 3 moves outward; if the double-output shaft motor 7 is switched to reverse rotation, the pulled-out storage box 3 can be automatically retracted into the desk box 2.

[0057] Example 2

[0058] In this embodiment, on the basis of the first embodiment, the telescopic tube 53 is replaced by a double tube section from a single tube section. Figure 10-12 As shown, the telescopic tube 53 includes an intermediate tube section 531 whose bottom is inserted into the fixed tube 52 and an upper tube section 532 whose upper end is fixed to the lower end of the table top 1 and whose lower end is sleeved outside the intermediate tube section 531. The connecting tube 6 is fixedly connected to the middle of the two intermediate tube sections 531. A set of telescopic driving components are arranged between the upper tube section 532 and the intermediate tube section 531 and between the fixed tube 52 and the intermediate tube section 531. That is, a rotating sleeve 22 is rotatably arranged at both ends of the interior of the intermediate tube section 531. At the opposite end of the rotating sleeve 22, a rotating sleeve 22 is arranged at the same The shaft is fixed with a driven bevel gear 24 meshing with the same driving bevel gear 25. Each table leg 5 is provided with two fixing screws 21, which are respectively vertically fixed at the bottom of the fixed tube 52 and the top of the upper tube section 532. With the forward and reverse rotation of the driving bevel gear 25, the upper tube section 532 and the fixed tube 52 are synchronously approached or moved away from the middle tube section 531. The connecting rod 15 is a telescopic rod, the fixed section 151 of the telescopic rod is fixed to the guide link 14, and the telescopic section 152 of the telescopic rod is fixed to the end of the push block 16 located outside the table box 2.

[0059] This embodiment can significantly increase the maximum travel of the desktop lifting and lowering, and improve the lifting speed.

[0060] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A desk with an automatically retractable desk box and an adjustable desk top, comprising a desk top (1), a desk box (2) fixed to the lower end surface of the desk top (1), and a table leg assembly connected to the desk top (1), characterized in that: The table leg assembly comprises table legs (5) arranged in parallel on both sides of a table box (2), the table legs (5) comprising support feet (51) abutting against the ground, fixed tubes (52) vertically fixed on the support feet (51), and telescopic tubes (53) telescopically arranged in the fixed tubes (52) and driving the table board (1) to rise and fall as it is telescopically extended, a connecting tube (6) being connected between the two telescopic tubes (53), a storage box (3) for storage being provided on both sides of the table box (2) perpendicular to the seating area, the lifting and lowering of the table legs (5) and the storage of the storage box (3) being synchronously controlled by a linkage switching drive assembly, the linkage switching drive assembly comprising a drive assembly located in the connecting tube (6), a drive assembly located between the table legs (5) and the connecting tube (6), and a drive assembly located between the table legs (5) and the connecting tube (6). The invention relates to a telescopic drive component between the table box (2), the storage box (3) and the connecting tube (6), and a push-pull drive component between the table box (2), the storage box (3) and the connecting tube (6), wherein the drive assembly comprises two coaxially arranged positive and negative screw rods (8) with opposite thread directions, the positive and negative screw rods (8) are rotatably arranged in the connecting tube (6) through a bearing seat and are synchronously controlled by a double-output shaft motor (7) located between the two, a first disconnecting mechanism capable of connecting or disconnecting the two is arranged between the telescopic drive component and the positive and negative screw rods (8), and a second disconnecting mechanism capable of connecting or disconnecting the two is arranged between the push-pull drive component and the positive and negative screw rods (8), and when the first disconnecting mechanism is connected, the second disconnecting mechanism is disconnected; when the first disconnecting mechanism is disconnected, the second disconnecting mechanism is connected.

2. A desk with an automatically retractable desk box and an adjustable height desk top according to claim 1, characterized in that: The telescopic drive assembly comprises a fixed screw (21), the fixed screw (21) being vertically arranged and having its bottom fixed at the bottom of a fixed tube (52), a rotating sleeve (22) being rotatably arranged in the telescopic tube (53) for the fixed screw (21) to pass through, a driven bevel gear (24) being coaxially fixed at the upper end of the rotating sleeve (22) for the fixed screw (21) to pass through, a first nut (23) being screwed to the fixed screw (21) being fixed at the lower end of the rotating sleeve (22), a connecting shaft (26) being rotatably arranged at both ends of the connecting tube (6), a driving bevel gear (25) being meshed with the driven bevel gear (24) being coaxially fixed at one end of the connecting shaft (26) located in the telescopic tube (53), and a first disconnecting mechanism being arranged between one end of the connecting shaft (26) located in the connecting tube (6) and the end of the forward and reverse screw rods (8) close thereto.

3. The desk with automatically retractable desk box and adjustable desk top according to claim 2, characterized in that: The first disconnecting mechanism comprises a receiving groove (261) with a regular polygonal cross section which is recessed at one end of the connecting shaft (26) away from the driving bevel gear (25), a limiting groove (801) which is recessed at one end of the forward and reverse screw rods (8) facing the connecting shaft (26) and has the same shape as the receiving groove (261), and a limiting block (27) which is elastically and telescopically arranged in the receiving groove (261), a first spring (28) which drives the limiting block (27) to partially extend and be plugged into the limiting groove (801) in a normal state is arranged in the receiving groove (261), and a driving locking mechanism which drives the limiting block (27) to disengage from the limiting groove (801) and realizes locking of the connecting shaft (26) and the connecting tube (6) is arranged between the limiting block (27) and the connecting tube (6).

4. The desk with automatically retractable desk box and adjustable height of desk top according to claim 3, characterized in that: The driving locking mechanism comprises a cone sleeve (29) which is sleeved outside the connecting shaft (26) and has a diameter gradually increasing from one end close to the forward and reverse screw rods (8) to the other end away from the forward and reverse screw rods (8), avoidance grooves (262) which are opened along the axial direction of the connecting shaft (26) on both sides, and a connecting block (30) which passes through the avoidance grooves (262) and has two ends respectively fixed to one end of the stop block (27) away from the stop groove (801) and the inner wall of the cone sleeve (29), a plurality of tooth grooves (291) are evenly spaced in the circumferential direction on the outer ring wall of the cone sleeve (29) at the end away from the forward and reverse screw rods (8), and an extrusion locking block (291) is telescopically arranged on the inner wall of the connecting tube (6) so as to extend and squeeze the cone sleeve (29) and drive the stop block (27) to move in the direction of the compression spring. 31), the lower surface of the extrusion locking block (31) is arranged as an inclined arc surface (311) that fits with the surface of the cone sleeve (29), and the inclined arc surface (311) is arranged with a limit tooth (312) that meshes with the tooth groove (291) when the limit block (27) is completely separated from the limit groove (801) at intervals around its arc direction. The extension and contraction of the extrusion locking block (31) is controlled by the power on or off of the first electromagnet (32). A groove is concavely arranged on the inner wall of the connecting tube (6), and the first electromagnet (32) is fixed at the bottom of the groove. A second spring (33) is arranged between the bottom of the groove and the first electromagnet (32), and its two ends are respectively fixed to the two. The elastic force of the second spring (33) is greater than the elastic force of the first spring (28).

5. The desk with automatically retractable desk box and adjustable height of desk top according to claim 1, characterized in that: The push-pull drive assembly comprises a driving slider (9) respectively screwed on the forward and reverse screw rods (8), a guide connecting rod (14) passing through the connecting tube (6) and driving the driving slider (9) to slide along the length direction of the connecting tube (6), a push block (16) passing through the table box (2) and connected to the outer wall of the storage box (3) away from the opening and capable of sliding along the pulling direction of the storage box (3), and a connecting connecting rod (15) for connecting the guide connecting rod (14) and the push block (16). A second nut (10) screwed to the forward and reverse screw rods (8) is arranged in the central hole of the driving slider (9), and a second disconnecting mechanism is arranged between the driving slider (9), the second nut (10), the storage box (3) and the table box (2).

6. The desk with automatically retractable desk box and adjustable height of desk top according to claim 5, characterized in that: The second disconnecting mechanism comprises a sliding mechanism which is arranged between the second nut (10) and the driving slider (9) and which puts the two in a locked state under normal conditions and switches the two to relative rotational cooperation after the torque between the two exceeds a preset value. A locking mechanism is arranged in the desk box (2) and is locked when the storage box (3) moves to a maximum stroke in the desk box (2).

7. The desk with automatically retractable desk box and adjustable height of desk top according to claim 6, characterized in that: The slipping structure comprises a mounting groove (11) recessed in the inner wall of the central hole of the driving slider (9), a locking groove (1001) recessed in the outer ring wall of the nut, and a locking block (12) which can be fully retracted into the mounting groove (11) or partially extended out of the mounting groove (11) and plugged into the locking groove (1001); a third spring (13) is arranged in the mounting groove (11) to drive the locking block (12) to be in a partially extended state; and the locking block (12) is provided with guiding inclined surfaces (121) on both sides of the nut circumference to facilitate the locking block (12) to slide into or out of the locking groove (1001).

8. The desk with automatically retractable desk box and adjustable height of desk top according to claim 7, characterized in that: The locking mechanism comprises a mounting block (19) protrudingly arranged on one side of the two storage boxes (3) facing each other and having a slot (191) at the bottom, an assembly box (34) fixed at the middle of the inner bottom surface of the desk box (2), and a locking block (35) vertically elastically retracted at the upper end of the assembly box (34) and capable of being simultaneously plugged into the slots (191) of the two mounting blocks (19) after being extended, the locking block (35) being provided with a matching inclined surface (351) which causes the locking block (35) to retract first and then reset and insert into the slots (191) when the mounting block (19) approaches the locking block with a pressure exceeding a preset value, a second electromagnet (39) being fixed in the assembly box (34), a fourth spring (36) being provided between the second electromagnet (39) and the locking block (35) and having two ends fixed to the two, and the extension and retraction of the locking block (35) is controlled by the power on or off of the second electromagnet (39).

9. The desk with automatically retractable desk box and adjustable height of desk top according to claim 8, characterized in that: A third electromagnet (17) is embedded on the side of the push block (16) opposite to the storage box (3), an iron insert (18) which can be attracted by the energized third electromagnet (17) is embedded on the storage box (3), a pull rod (37) vertically extends from the lower end of the locking block (35) and passes through the lower surface of the table box (2), and a pull ring (4) is fixed on the opposite side of the storage box (3).

10. The desk with automatically retractable desk box and adjustable height of desk top according to claim 5, characterized in that: The telescopic tube (53) comprises an intermediate tube section (531) whose bottom is inserted into the fixed tube (52) and an upper tube section (532) whose upper end is fixed to the lower end of the table top (1) and whose lower end is sleeved outside the intermediate tube section (531). The connecting tube (6) is fixedly connected to the middle of the two intermediate tube sections (531). A set of telescopic driving components is arranged between the upper tube section (532) and the intermediate tube section (531) and between the fixed tube (52) and the intermediate tube section (531). The two sets of telescopic driving components are arranged between the upper tube section (532) and the intermediate tube section (531). The driven bevel gear (24) in the telescopic drive assembly is synchronously meshed with the same driving bevel gear (25), and with the positive and negative rotation of the driving bevel gear (25), the fixed tube (52) and the upper tube section (532) are synchronously moved closer to or farther away from the middle tube section (531). The connecting rod (15) is a telescopic rod, the fixed section (151) of the telescopic rod is fixed to the guide link (14), and the telescopic section (152) of the telescopic rod is fixed to one end of the push block (16) located outside the table box (2).

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