Stepless lifting desk pipe frame structure and corresponding stepless lifting desk

Abstract

The utility model provides a stepless lifting desk pipe frame structure and a corresponding stepless lifting desk. The stepless lifting desk pipe frame structure comprises a desk upper pipe frame, a desk lower pipe frame, two hand cranking lifters, a linkage rod and a hand cranking handle. The desk upper pipe frame comprises two upper vertical pipes; the desk lower pipe frame comprises two lower vertical pipes; a hand-cranking lifter is arranged between each upper vertical pipe and each lower vertical pipe; the two ends of the linkage rod are connected to the two hand cranking lifters respectively. The hand-cranking handle is detachably connected to a hand-cranking lifter. When the height of the desk needs to be adjusted, the hand-cranking handle is connected to the hand-cranking lifters, one of the hand-cranking lifters is driven by the hand-cranking handle, the two hand-cranking lifters can synchronously ascend and descend through the linkage rod, the two upper vertical pipes can synchronously ascend and descend, and therefore it is guaranteed that the relative position between the desk upper pipe frame and the desk lower pipe frame is stably adjusted; the overall height of the stepless lifting desk pipe frame structure is adjusted conveniently, and it is effectively guaranteed that the desk top is horizontal.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of desk, especially a stepless lifting desk pipe frame structure and corresponding stepless lifting desk. BACKGROUND

[0002] Different students have different heights, and students' heights are constantly changing in the growth process, in order to ensure that students sit upright and use comfort, the height of the desk is usually set to stepless lifting type adjustable height structure. Because the height of the desk needs to be adjusted at multiple support points, the prior art needs to adjust the height of each support position respectively, which is inconvenient to adjust and can easily cause the desktop to be uneven, affecting use. UTILITY MODEL CONTENTS

[0003] The utility model provides a stepless lifting desk pipe frame structure and corresponding stepless lifting desk, convenient adjustment, and effectively ensure the desktop level.

[0004] The utility model provides a stepless lifting desk pipe frame structure, including desk upper pipe frame, desk lower pipe frame, two hand-operated lifters, linkage rod and hand-operated handle,

[0005] The top of desk upper pipe frame is used for installing desktop and book bucket, and it includes two upper vertical pipes,

[0006] The desk lower pipe frame includes two lower vertical pipes, the bottom of two upper vertical pipes is respectively inserted in two lower vertical pipes, and the hand-operated lifter is arranged between each upper vertical pipe and lower vertical pipe,

[0007] The two ends of linkage rod are connected to two hand-operated lifters respectively, so that two hand-operated lifters are synchronous lifting,

[0008] The hand-operated handle is detachably connected to a hand-operated lifter and is used for driving the hand-operated lifter to lift.

[0009] Among them, the top of each upper vertical pipe is provided with a mounting piece, the mounting piece includes a top plate and two side plates, the top plate is a long strip shape arranged along the front and back direction, and two side plates are respectively connected to the left and right sides of the top plate, the top of the upper vertical pipe is clamped and fixed between two side plates, the top plate is used to adhere and support under the desktop, and the top plate is provided with a desktop mounting hole for connecting the desktop.

[0010] Among them, the desk upper pipe frame further includes an upper horizontal connecting pipe, and the two ends of the upper horizontal connecting pipe are respectively fixedly connected to two upper vertical pipes.

[0011] The desk lower pipe frame further comprises a lower horizontal connecting pipe, two ends of the lower horizontal connecting pipe are fixedly connected to the two lower vertical pipes respectively, and the linkage rod is sleeved in the lower horizontal connecting pipe.

[0012] The hand-cranked lifter has a driving hole, the two lower vertical pipes are each provided with an inner insertion hole at a position corresponding to the driving hole, one end of the linkage rod is inserted into the inner insertion hole and is inserted into the driving hole, and the linkage rod is positioned in the circumferential direction of the driving hole.

[0013] One of the lower vertical pipes is provided with an outer insertion hole corresponding to the other end of the driving hole, the hand-cranked handle is inserted into the outer insertion hole and is detachably inserted into the other end of the driving hole, so as to drive the hand-cranked lifter to lift through the driving hole.

[0014] Two lower sides of the two ends of the lower horizontal connecting pipe are each provided with a notch, the linkage rod is sleeved in the lower horizontal connecting pipe, one end of the linkage rod close to the outer insertion hole is provided with a pin hole, a positioning pin is inserted into the pin hole, and the pin hole is correspondingly arranged with the notch, so that the positioning pin is exposed through the notch.

[0015] The hand-cranked lifter comprises a tooth box, a driving bevel gear, a transmission bevel gear, a screw rod, a tooth sleeve and a limiting guide block, the tooth box is fixed in the lower vertical pipe, the driving bevel gear and the transmission bevel gear are in engagement and are rotationally arranged in the tooth box, the rotation axis of the driving bevel gear is the center axis of the linkage rod, the driving hole is arranged in the driving bevel gear and penetrates the driving bevel gear along the rotation axis of the driving bevel gear, the transmission bevel gear is fixedly connected with the bottom end of the screw rod, so as to drive the screw rod to rotate around the center axis of the screw rod, the tooth sleeve is threadedly connected with the screw rod and is fixed in the upper vertical pipe, the limiting guide block is slidably arranged in the upper vertical pipe along the axial direction of the upper vertical pipe, and the top end of the screw rod is rotationally connected with the limiting guide block.

[0016] The hand-cranked handle comprises a driving rod, a crank main body and a handle, the driving rod is fixedly connected with one end of the crank main body, the driving rod is a metal rod and is used for being inserted into the driving hole, the crank main body is made of plastic material, the driving rod and the crank main body are made by an in-mold injection molding process, the other end of the crank main body is fixedly provided with a crank, the handle is a hollow structure, is sleeved outside the crank and is rotationally connected with the crank.

[0017] The cross section of the driving rod is hexagonal, the driving hole is a hexagonal hole, and the cross section of the linkage rod is hexagonal.

[0018] The stepless lifting desk pipe frame structure further comprises a connecting sleeve; a buckle hole is arranged on the inner side of the top of the lower vertical pipe, a buckle is arranged on the outer side of the connecting sleeve, the bottom of the connecting sleeve is inserted into the inner cavity of the lower vertical pipe, and the buckle is buckled into the buckle hole; the top of the connecting sleeve protrudes from the lower vertical pipe; the upper vertical pipe is inserted into the inner hole of the connecting sleeve and is arranged to slide up and down on the inner hole of the connecting sleeve.

[0019] In another aspect, the utility model provides a kind of stepless lifting desk, including desktop, bookcase and the stepless lifting desk pipe frame structure of preceding description;The desktop and the bookcase are all installed on the desk upper pipe frame of the stepless lifting desk pipe frame structure.

[0020] The stepless lifting desk pipe frame structure and corresponding stepless lifting desk provided by the utility model can ensure the relative position between desk upper pipe frame and desk lower pipe frame when adjusting the height of desk, realize the adjustment of the overall height of stepless lifting desk pipe frame structure, and conveniently adjust the height of desk, and effectively ensure the horizontal of desktop. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic view of stepless lifting desk provided by preferred embodiment of the utility model;

[0022] Figure 2 It is Figure 1 The structure schematic view of stepless lifting desk pipe frame structure of stepless lifting desk in it;

[0023] Figure 3 It is Figure 2 The structure schematic view of another angle of stepless lifting desk pipe frame structure in it;

[0024] Figure 4 It is Figure 2 The exploded schematic view of stepless lifting desk pipe frame structure in it;

[0025] Figure 5 It is Figure 2 The enlarged view of A in it;

[0026] Figure 6 It is Figure 3 The enlarged view of B in it;

[0027] Figure 7 It is Figure 4 The structure schematic view of hand crank lifter of stepless lifting desk pipe frame structure in it;

[0028] Figure 8 It is Figure 7A schematic exploded view of a hand crank lifter;

[0029] Figure 9 is Figure 4 A schematic view of a structure of a hand crank of the stepless lifting desk pipe frame structure. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0031] In the drawings, the units with similar structures are denoted by the same reference numerals.

[0032] Please refer to Figure 1 The preferred embodiment of the present application provides a stepless lifting desk, which comprises a desktop 300, a book holder 200 and a stepless lifting desk pipe frame structure 100. The desktop 300 and the book holder 200 are both installed on the stepless lifting desk pipe frame structure 100, and the height of the desktop 300 and the book holder 200 can be adjusted through the stepless lifting desk pipe frame structure 100.

[0033] As shown in Figure 2 , Figure 3 and Figure 4 , the stepless lifting desk pipe frame structure 100 comprises a desk upper pipe frame 1, a desk lower pipe frame 2, two hand crank lifters 3, a linkage rod 4 and a hand crank 5. The desk upper pipe frame 1 and the desk lower pipe frame 2 are connected through the two hand crank lifters 3. The linkage rod 4 connects the two hand crank lifters 3, and the hand crank 5 is used to drive the hand crank lifter 3 to act.

[0034] The top of the desk upper pipe frame 1 is used to install the desktop 300 and the book holder 200, and comprises two upper vertical pipes 11. The desk lower pipe frame 2 comprises two lower vertical pipes 21. The bottoms of the two upper vertical pipes 11 are respectively inserted into the two lower vertical pipes 21, and the two upper vertical pipes 11 and the two lower vertical pipes 21 can be connected to form two vertical legs of the desk, which are respectively arranged on the left and right sides of the desk. The hand crank lifter 3 is arranged between each upper vertical pipe 11 and each lower vertical pipe 21, and the position adjustment between the two upper vertical pipes 11 and the two lower vertical pipes 21 is realized by the two hand crank lifters 3. By changing the position of the upper vertical pipe 11, the height of the two vertical legs can be changed, so as to adjust the height of the entire stepless lifting desk pipe frame structure 100.

[0035] The two ends of the linkage rod 4 are connected to the two hand-operated lifters 3 respectively, so that the two hand-operated lifters 3 can be lifted synchronously. The hand-operated handle 5 is detachably connected to one hand-operated lifter 3, and is used to drive the hand-operated lifter 3 to lift.

[0036] When the height of the desk needs to be adjusted, the hand-operated handle 5 is connected to one hand-operated lifter 3, and one hand-operated lifter 3 is driven by the hand-operated handle 5. The two hand-operated lifters 3 can be lifted synchronously by the linkage rod 4, and the two upper vertical pipes 11 can be moved synchronously, so that the relative position between the upper pipe frame 1 and the lower pipe frame 2 of the desk is adjusted stably, the overall height of the stepless lifting desk pipe frame structure 100 is adjusted, the adjustment is convenient, and the horizontal position of the desktop 300 is effectively ensured.

[0037] As shown in Figure 2 , Figure 3 and Figure 4 , the upper pipe frame 1 of the desk further comprises an upper horizontal connecting pipe 12, and the two ends of the upper horizontal connecting pipe 12 are fixedly connected to the two upper vertical pipes 11 respectively, so that the upper pipe frame 1 of the desk forms an integral structure and the structural strength is improved.

[0038] The desktop 300 and the book holder 200 are installed on the upper pipe frame 1 of the desk. More specifically, the top of each upper vertical pipe 11 is provided with a mounting piece 13, and the mounting piece 13 comprises a top plate 131 and two side plates 132. The top plate 131 is a long strip arranged in the front-rear direction, and the two side plates 132 are connected to the left and right sides of the top plate 131 respectively. The top of the upper vertical pipe 11 is clamped and fixed between the two side plates 132, so as to fixedly connect the upper vertical pipe 11 and the mounting piece 13. The top plate 131 is used to abut and support the desktop 300, and the desktop mounting hole 130 for connecting the desktop 300 is arranged on the top plate 131. The desktop 300 can be fixedly connected to the upper pipe frame 1 of the desk by bolts through the desktop mounting hole 130, so that the desktop 300 of different materials, sizes and shapes can be assembled.

[0039] The side plate 132 can be provided with a book holder mounting hole (not shown in the figure) for connecting the book holder 200, and the book holder 200 can be fixedly connected by bolts, so that the book holder 200 of different materials, sizes and shapes can be assembled. Here, in other embodiments, the book holder 200 can also be welded on the side plate 132 or the top plate 131.

[0040] The lower pipe frame 2 of the desk further comprises a lower horizontal connecting pipe 22, and the two ends of the lower horizontal connecting pipe 22 are fixedly connected to the two lower vertical pipes 21 respectively, so that the lower pipe frame 2 of the desk forms an integral structure and the structural strength is improved. The linkage rod 4 is sleeved in the lower horizontal connecting pipe 22, and the linkage rod 4 can be protected by the lower horizontal connecting pipe 22, so as to avoid external interference to the rotation of the linkage rod 4 and ensure the rotation reliability.

[0041] Combination Figure 3 and Figure 6 As shown, the hand-cranked lifting device 3 has a drive hole 30. On the opposing walls of the two lower vertical tubes 21, corresponding to the drive hole 30, there are inner insertion holes 211. The linkage rod 4 passes through the inner insertion hole 211 and is inserted into one end of the drive hole 30, with the linkage rod 4 circumferentially positioned with the drive hole 30. The inner insertion hole 211 exposes the drive hole 30, facilitating the connection between the linkage rod 4 and the drive hole 30.

[0042] Combination Figure 2 , Figure 4 and Figure 5 As shown, one of the lower risers 21 has an external insertion hole 212 on its wall, which corresponds to the other end of the drive hole 30. The hand crank 5 passes through the external insertion hole 212 and is detachably inserted into the other end of the drive hole 30 to drive the hand crank lift 3 to rise and fall through the drive hole 30. The other end of the drive hole 30 is exposed through the external insertion hole 212, making it easy to insert the hand crank 5 into the drive hole 30.

[0043] like Figure 6 As shown, notches 220 are provided on the lower sides of both ends of the lower horizontal connecting pipe 22. The notches 220 can be used for observation and installation of the linkage rod 4.

[0044] A pin hole is provided at one end of the linkage rod 4 near the external insertion hole 212. A positioning pin 221 is inserted into the pin hole. The pin hole and the notch 220 are correspondingly arranged so that the positioning pin 221 is exposed through the notch 220, which facilitates the installation and removal of the positioning pin 221. After the linkage rod 4 is assembled, the positioning pin 221 is inserted into the pin hole to prevent the linkage rod 4 from coming out of the drive hole 30 and the external insertion hole 212. Only one positioning pin 221 needs to be installed to achieve the positioning connection of the linkage rod 4, which is convenient and quick to install.

[0045] After the hand-cranked lifting device 3 is installed into the lower upright pipe 21 with the external insertion hole 212, both ends of the drive hole 30 of the hand-cranked lifting device 3 are exposed. When installing the linkage rod 4, the linkage rod 4 can pass through the external insertion hole 212, the drive hole 30 and the internal insertion hole 211 in sequence. One end of the linkage rod 4 further passes through the lower horizontal connecting pipe 22 and is inserted into the drive hole 30 of the other hand-cranked lifting device 3. In this way, both ends of the linkage pipe can be installed at one end of the two drive holes 30 respectively, so as to facilitate the assembly of the linkage rod 4. Since the other lower upright pipe 21 only has an internal insertion hole 211, the other end of the drive hole 30 of the other hand-cranked lifting device 3 will not be exposed, thus restricting the linkage rod from coming out of the other drive hole 30. Finally, the positioning pin 221 is installed into the pin hole to complete the assembly of the linkage rod 4. The positioning pin 221 can prevent the linkage rod 4 from moving towards the external insertion hole 212, so that both ends of the linkage rod are positioned in the two drive holes 30 respectively.

[0046] Combination Figure 7 and Figure 8 As shown, the hand-cranked lifting device 3 includes a gearbox 31, an active bevel gear 32, a transmission bevel gear 33, a lead screw 34, a gear sleeve 35, and a limiting guide block 36. The gearbox 31 houses the active bevel gear 32 and the transmission bevel gear 33 to ensure transmission stability. The lead screw 34 is fixedly connected to the transmission bevel gear 33. When the lead screw 34 rotates around its own axis, the gear sleeve 35 can move along the axis of the lead screw 34, and the gear sleeve 35 can drive the upper riser 11 to move up and down. The limiting guide block 36 is disposed in the upper riser 11 to ensure the rotational stability of the lead screw 34.

[0047] The gearbox 31 is fixed in the lower riser tube 21 to connect the hand-cranked lifting device 3 to the lower riser tube 21. The gearbox 31 includes two gearbox shells 311, which are arranged side by side and connected. The active bevel gear 32 and the drive bevel gear 33 are both located between the two gearbox shells 311. The two gearbox shells 311 facilitate the assembly and connection between the active bevel gear 32, the drive bevel gear 33 and the gearbox 31.

[0048] Combination Figure 4 , Figure 5 , Figure 6 As shown, the lower riser 21 is provided with a through hole 213, and a bolt 2131 for fixing the gearbox 31 is inserted into the through hole 213 to fix the gearbox 31 to the lower riser 21. Here, the gearbox 31 can also be fixed to the lower riser 21 by welding, riveting or other methods.

[0049] like Figure 8As shown, the active bevel gear 32 meshes with the transmission bevel gear 33, and both are rotatably mounted in the gearbox 31. The direction of rotation can be changed through their meshing. The rotation axis of the active bevel gear 32 is the centerline axis of the linkage rod 4. The drive hole 30 is located in the active bevel gear 32 and passes through the active bevel gear 32 along its rotation axis to facilitate the insertion and engagement of the drive hole 30 with the linkage rod 4 and the hand crank 5.

[0050] The transmission bevel gear 33 is fixedly connected to the bottom end of the lead screw 34 to drive the lead screw 34 to rotate around its central axis; the toothed sleeve 35 is threadedly connected to the lead screw 34 and is fixed inside the upper riser 11. When the lead screw 34 rotates around its own axis, the threaded engagement between the toothed sleeve 35 and the lead screw 34 causes the toothed sleeve 35 to move up and down along the central axis of the lead screw 34, thereby moving the upper riser 11 and causing it to rise and fall.

[0051] like Figure 4 As shown, the upper riser 11 is provided with a screw through hole 1135 for fixing the toothed sleeve 35 with a screw, so that the toothed sleeve 35 is fixed in the upper riser 11. Figure 8 As shown, the toothed fitting 35 includes two semi-circular toothed fittings 351, which are joined together to clamp the lead screw 34 between them. The upper riser 11 has two screw through holes 1135, which are used to fix the two semi-circular toothed fittings 351 by two screws respectively.

[0052] The limiting guide block 36 is slidably disposed within the upper riser 11 along the axial direction, and the top end of the lead screw 34 is rotatably connected to the limiting guide block 36. The limiting guide block 36 ensures the stability of the top end of the lead screw 34 during rotation and prevents the lead screw 34 from shaking.

[0053] like Figure 9 As shown, the hand crank 5 includes a drive rod 51, a crank body 52, and a handle 53. The drive rod 51 is made of metal and is used to insert into the drive hole 30. The crank body 52 is made of plastic. The drive rod 51 and the crank body 52 are manufactured by in-mold injection molding to form an integral structure, thereby improving the connection strength between the two. The drive rod 51 is located at one end of the crank body 52, and a rocker arm 521 is fixed to the other end of the crank body 52. ​​The handle 53 is a hollow structure, fitted over the rocker arm 521, and rotatably connected to the rocker arm 521, so that the handle 53 can rotate automatically on the crank body 52 without loosening, facilitating the rotation of the drive rod 51. Furthermore, the handle 53 is riveted to the rocker arm 521 to facilitate the assembly and connection between the handle 53 and the rocker arm 521.

[0054] Further, the cross section of the driving rod 51 is hexagonal, the driving hole 30 is hexagonal, and the cross section of the linkage rod 4 is hexagonal. The driving hole 30, the linkage rod 4 and the driving rod 51 are all hexagonal, so that the three are convenient to process and manufacture. Of course, in the embodiments, the driving hole 30, the linkage rod 4 and the driving rod 51 can also be other shapes such as quadrilateral, triangle, cross, etc.

[0055] As shown in Figure 4 The endless lifting desk pipe rack structure 100 further comprises a connecting sleeve 6. The inner side of the top of the lower vertical pipe 21 is provided with a buckle hole 216, the outer side of the connecting sleeve 6 is provided with a buckle 61, the bottom of the connecting sleeve 6 is inserted into the inner cavity of the lower vertical pipe 21, and the buckle 61 is buckled into the buckle hole 216. The top of the connecting sleeve 6 protrudes from the lower vertical pipe 21, the upper vertical pipe 11 is inserted into the inner hole of the connecting sleeve 6 and is arranged to slide up and down on the inner hole of the connecting sleeve 6. The connecting sleeve 6 can close the gap between the upper vertical pipe 11 and the lower vertical pipe 21, prevent foreign matters from entering, and avoid friction between the upper vertical pipe 11 and the lower vertical pipe 21, reduce wear and tear, and improve service life.

[0056] As shown in Figure 4 The bottom of each lower vertical pipe 21 is fixed with a bottom pipe 23. The bottom pipe 23 is arranged in the front-rear direction, and the two ends of the bottom pipe 23 are provided with foot pads 7. The bottom pipe 23 can keep the stability of the two vertical feet of the desk.

[0057] In conclusion, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not used to limit the present application, and those skilled in the art can make various changes and decorations without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application is subject to the scope defined by the claims.

Claims

1. A stepless lifting desk pipe rack structure, characterized in that, The utility model provides a desk pipe frame, including desk pipe frame, desk pipe frame, two hand -operated elevators, linkage rod and hand -operated handle; The top of the desk pipe frame is used for installing the desktop and bookshelf, and comprises two upper vertical pipes; The desk pipe frame comprises two lower vertical pipes; the bottom of each of the two upper vertical pipes is respectively inserted into each of the two lower vertical pipes, and the hand-operated elevators are arranged between each of the upper vertical pipes and each of the lower vertical pipes; The two ends of the linkage rod are respectively connected to the two hand-operated elevators to make the two hand-operated elevators synchronous lifting; The hand-operated handle is detachably connected to one of the hand-operated elevators and is used for driving the hand-operated elevators to lift.

2. The stepless lifting desk pipe rack structure according to claim 1, characterized in that, The top of each of the upper vertical pipes is provided with a mounting member, the mounting member comprises a top plate and two side plates, the top plate is a long strip arranged in the front-back direction, and the two side plates are respectively connected to the left and right sides of the top plate; the top of the upper vertical pipe is clamped and fixed between the two side plates; the top plate is used for being attached to and supported under the desktop, and the top plate is provided with a desktop mounting hole used for connecting the desktop.

3. The stepless lifting desk pipe rack structure according to claim 1, characterized in that, The desk pipe frame further comprises an upper horizontal connecting pipe, and the two ends of the upper horizontal connecting pipe are fixedly connected to the two upper vertical pipes.

4. The stepless lifting desk pipe rack structure according to any one of claims 1-3, characterized in that, The desk pipe frame further comprises a lower horizontal connecting pipe, the two ends of the lower horizontal connecting pipe are fixedly connected to the two lower vertical pipes, and the linkage rod is sleeved in the lower horizontal connecting pipe; The hand-operated elevators have a driving hole; the opposite pipe walls of the two lower vertical pipes are respectively provided with an inner insertion hole corresponding to the position of the driving hole, one end of the linkage rod is inserted into the inner insertion hole and inserted into the driving hole, and the linkage rod is circumferentially positioned with the driving hole; One of the pipe walls of one of the lower vertical pipes is provided with an outer insertion hole, the outer insertion hole is correspondingly arranged at the other end of the driving hole, the hand-operated handle is inserted into the outer insertion hole, and the hand-operated handle is detachably inserted into the other end of the driving hole to drive the hand-operated elevators to lift through the driving hole.

5. The stepless lifting desk pipe rack structure according to claim 4, characterized in that, The two lower sides of the two ends of the lower horizontal connecting pipe are respectively provided with notches; the linkage rod is sleeved in the lower horizontal connecting pipe; one end of the linkage rod close to the outer insertion hole is provided with a pin hole, a positioning pin is inserted into the pin hole, and the pin hole is correspondingly arranged with the notches to expose the positioning pin through the notches.

6. The stepless lifting desk pipe rack structure according to claim 4, characterized in that, The hand-operated elevators comprise a gear box, a driving bevel gear, a transmission bevel gear, a screw rod, a gear sleeve and a limiting guide block; the gear box is fixed in the lower vertical pipe; the driving bevel gear and the transmission bevel gear are in engagement and are both rotationally arranged in the gear box; the rotation axis of the driving bevel gear is the center axis of the linkage rod, the driving hole is arranged in the driving bevel gear and penetrates the driving bevel gear along the rotation axis of the driving bevel gear; the transmission bevel gear is fixedly connected with the bottom end of the screw rod to drive the screw rod to rotate around the central axis of the screw rod; the gear sleeve is threadedly connected with the screw rod, and the gear sleeve is fixed in the upper vertical pipe; the limiting guide block is slidingly arranged in the upper vertical pipe along the axial direction of the upper vertical pipe, and the top end of the screw rod is rotationally connected with the limiting guide block.

7. The stepless lifting desk pipe rack structure according to claim 4, characterized in that, The hand crank includes a driving rod, a crank main body and a handle; one end of the driving rod is fixedly connected with the crank main body, the driving rod is a metal rod and is used for being inserted into the driving hole; the crank main body is made of plastic material; the driving rod and the crank main body are made by an in-mold injection molding process; the other end of the crank main body is fixedly provided with a rocker; the handle is a hollow structure, is sleeved outside the rocker and is rotationally connected with the rocker.

8. The stepless lifting desk pipe rack structure according to claim 7, characterized in that, The cross section of the driving rod is hexagonal, the driving hole is a hexagonal hole and the cross section of the linkage rod is hexagonal.

9. The stepless lifting desk pipe rack structure according to any one of claims 1-3, characterized in that, The stepless lifting desk pipe rack structure further comprises a connecting sleeve; the inner side of the top of the lower vertical pipe is provided with a buckle hole, the outer side of the connecting sleeve is provided with a buckle, the bottom of the connecting sleeve is inserted into the inner cavity of the lower vertical pipe, and the buckle is buckled into the buckle hole; the top of the connecting sleeve protrudes from the lower vertical pipe; the upper vertical pipe is inserted into the inner hole of the connecting sleeve and is arranged to slide up and down on the inner hole of the connecting sleeve.

10. A stepless lifting desk characterized by, The stepless lifting desk pipe rack structure comprises a desktop, a book holder and the stepless lifting desk pipe rack structure according to any one of claims 1 to 9; the desktop and the book holder are both mounted on the desk upper pipe rack of the stepless lifting desk pipe rack structure.

Images