Lifting adjusting mechanism of desk and chair

Abstract

The utility model discloses a lifting adjusting mechanism for desks and chairs, which comprises bottom supporting rods arranged in pairs and connected through a middle connecting rod, containing holes are formed in the bottom supporting rods, and screw rods are rotatably arranged in the containing holes; the lifting rod slides in the containing hole, a threaded hole is formed in the bottom of the lifting rod, and the lifting rod slides up and down through cooperation of the threaded hole and the screw rod; the lifting mechanism is installed in the middle connecting rod and the bottom supporting rod and comprises a rotating shaft, first bevel gears and second bevel gears, the rotating shaft is rotationally arranged in the middle connecting rod, the first bevel gears are installed at the two ends of the rotating shaft, and the second bevel gears are fixed to the threaded rods and meshed with the first bevel gears; a plane thrust bearing is arranged on the screw rod; the driving mechanism is arranged on the middle connecting rod and comprises a worm gear, a worm and a jiggle bar, the worm gear is fixed on the rotating shaft, and the worm is fixed at the tail end of the jiggle bar and meshed with the worm gear.

Description

Technical Field

[0001] This application relates to the technical field of desks and chairs, and in particular to a lifting and adjusting mechanism for desks and chairs. Background Art

[0002] In the modern educational environment, the comfort and adjustability of desks and chairs are crucial for students' learning efficiency and physical health. Most traditional desks and chairs adopt a fixed-height design and cannot be adjusted individually according to the height differences of students, which often leads to improper postures when students use desks and chairs. In the long run, it is easy to cause health problems such as spinal curvature and vision decline. Therefore, with the increasing attention to health and educational environment, adjustable desks and chairs have gradually become the mainstream products in the market.

[0003] The existing adjustable desks and chairs achieve the rotation of bevel gears by manually turning the crank handle, and then transmit the power to the lead screw through the bevel gears to achieve the lifting of the desktop. However, in use, due to the different meshing degrees of the main gears and driven gears on both sides, the heights on both sides of the desk will be slightly different, and turning the crank handle will not be smooth enough, affecting the use. Moreover, most adjustable desks and chairs lack a locking mechanism for the crank handle and are prone to accidental touch.

[0004] The above content is only used to assist in understanding the technical solution of this application, and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0005] Based on this, this application provides a lifting and adjusting mechanism for desks and chairs to solve one of the above technical problems.

[0006] The technical solution adopted by this application to solve its technical problems is as follows: A lifting and adjusting mechanism for a desk and chair, comprising: bottom support rods, arranged in pairs and connected by an intermediate connecting rod, with accommodation holes formed thereon, and a screw rod is rotatably arranged in the accommodation holes; a lifting rod, sliding in the accommodation holes, with a threaded hole formed at its bottom, and the lifting rod realizes up and down sliding through the cooperation of the threaded hole and the screw rod; a lifting mechanism, installed in the intermediate connecting rod and the bottom support rods, including a rotating shaft, a first bevel gear, and a second bevel gear, the rotating shaft rotates in the intermediate connecting rod, and first bevel gears are installed at both ends thereof, the second bevel gear is fixed on the screw rod and meshes with the first bevel gear, and a flat thrust bearing is arranged on the screw rod to provide thrust to press the second bevel gear and the first bevel gear, and the lifting rod is driven to move up and down by the rotation of the rotating shaft; a driving mechanism, arranged on the intermediate connecting rod, including a worm gear, a worm, and a rocking handle, the worm gear is fixed on the rotating shaft, the worm is fixed at the end of the rocking handle and meshes with the worm gear, the rocking handle rotates on the intermediate connecting rod, and the rotating shaft is driven to rotate by rotating the rocking handle, thereby driving the lifting mechanism to work; a handle locking mechanism is further arranged on the intermediate connecting rod for locking the rocking handle.

[0007] In some embodiments, the handle locking mechanism includes: a fixed seat, fixed on the intermediate connecting rod, the rocking handle passes through the fixed seat, and a chute is formed thereon; a locking member, sliding in the chute, and a locking rod is formed thereon.

[0008] In some embodiments, a number of locking holes matching the locking rod are formed on the rocking handle, and the rocking handle is locked by pushing the locking rod into the locking holes.

[0009] In some embodiments, a limiting hole communicating with the chute is formed on the fixed seat, and the locking rod slides in the limiting hole.

[0010] In some embodiments, an installation hole is formed in the intermediate connecting rod, and the rotating shaft rotates in the installation hole through a number of bearings.

[0011] In some embodiments, an annular baffle is formed in the accommodation hole, and the flat thrust bearing is arranged above the baffle and remains in contact with the baffle.

[0012] In some embodiments, matching limiting rings are formed at the ends of the lifting rod and the accommodation hole to prevent the lifting rod from disengaging.

[0013] In some embodiments, a support base is arranged at the bottom of the bottom support rod, and the top of the lifting rod can be fixed to the desk body or the chair surface.

[0014] The beneficial effects of the present application are as follows: The driving mechanism is driven by a rocking handle, which causes the worm to drive the worm wheel to rotate, and then causes the rotating shaft to rotate, driving the lifting mechanism to work. Under the cooperation of the first bevel gear and the second bevel gear, the threaded rod rotates, driving the lifting rod to move up and down to achieve lifting. Among them, a flat thrust bearing is provided on the threaded rod. While the threaded rod rotates, the flat thrust bearing provides a downward thrust, driving the second bevel gear to press against the first bevel gear to maintain a tight meshing state between the two, making the lifting on both sides more synchronous, ensuring the level of the table body or the chair surface, and also making the rocking of the rocking handle smoother. Adding a rocking handle locking mechanism effectively prevents the occurrence of accidental touching of the rocking handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 is an exploded view of the lifting rod and the bottom support rod of the present application.

[0017] Figure 2 is a partial cross-sectional view of the present application.

[0018] Figure 3 is the Figure 2 enlarged view of part A of the present application.

[0019] Figure 4 is an exploded view of the rocking handle and the handle locking mechanism of the present application.

[0020] Explanation of the reference numerals in the drawings: 1. Bottom support rod, 2. Intermediate connecting rod, 3. Accommodating hole, 4. Screw rod, 5. Lifting rod, 6. Threaded hole, 7. Lifting mechanism, 701. Rotating shaft, 702. First bevel gear, 703. Second bevel gear, 8. Flat thrust bearing, 9. Driving mechanism, 901. Worm wheel, 902. Worm, 903. Rocking handle, 10. Fixed seat, 11. Locking part, 1101. Locking rod, 12. Chute, 13. Locking hole, 14. Limiting hole, 15. Mounting hole, 16. Baffle, 17. Limiting ring, 18. Support base, 19. Desk body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection of the present application.

[0022] In the embodiment of the present application, please refer to Figures 1-4 As shown, the lifting and adjusting mechanism of a kind of desks and chairs mainly includes: bottom support rods 1, which are arranged in pairs and connected by an intermediate connecting rod 2, and accommodation holes 3 are opened thereon. A screw rod 4 is rotatably arranged in the accommodation hole 3; a lifting rod 5 slides in the accommodation hole 3, and a threaded hole 6 is opened at the bottom thereof. The lifting rod 5 realizes up and down sliding through the cooperation of the threaded hole 6 and the screw rod 4; a lifting mechanism 7 is installed in the intermediate connecting rod 2 and the bottom support rod 1, including a rotating shaft 701, a first bevel gear 702 and a second bevel gear 703. The rotating shaft 701 rotates in the intermediate connecting rod 2, and first bevel gears 702 are installed at both ends thereof. The second bevel gear 703 is fixed on the screw rod 4 and meshes with the first bevel gear 702. A flat thrust bearing 8 is arranged on the screw rod 4 to provide thrust to press the second bevel gear 703 and the first bevel gear 702, and the lifting rod 5 is driven to move up and down by rotating the rotating shaft 701; a driving mechanism 9 is arranged on the intermediate connecting rod 2, including a worm gear 901, a worm 902 and a hand crank 903. The worm gear 901 is fixed on the rotating shaft 701, the worm 902 is fixed at the end of the hand crank 903 and meshes with the worm gear 901. The hand crank 903 rotates on the intermediate connecting rod 2. By rotating the hand crank 903, the rotating shaft 701 is driven to rotate, and then the lifting mechanism 7 is driven to work; a handle locking mechanism is also arranged on the intermediate connecting rod 2 for locking the hand crank 903.

[0023] Next, some preferred / improved embodiments based on the above embodiments will be further elaborated. Any one or a combination of multiple of the following embodiments can be selected.

[0024] As Figure 4As shown, the handle locking mechanism includes: a fixed seat 10, fixed on the intermediate connecting rod 2, through which the rocking handle 903 passes, and a chute 12 is formed thereon; a locking member 11, sliding in the chute 12, on which a locking rod 1101 is formed, and the locking rod 1101 is used to lock the rocking handle 903.

[0025] Further, a plurality of locking holes 13 matching the locking rod 1101 are formed on the rocking handle 903. By pushing the locking rod 1101 into the locking holes 13, the rocking handle 903 is locked. A limiting hole 14 communicating with the chute 12 is formed on the fixed seat 10, and the locking rod 1101 slides in the limiting hole 14. Among them, a plurality of locking holes 13 are annularly distributed on the rocking handle 903 and are in the same plane as the locking rod 1101. The locking rod 1101 can only slide in the horizontal direction. When the locking rod 1101 disengages from the mounting hole 15, one end of the locking rod 1101 will enter the limiting hole 14, effectively preventing the locking member 11 from disengaging from the chute 12.

[0026] As Figure 2 shown, an installation hole 15 is formed in the intermediate connecting rod 2, and the rotating shaft 701 rotates in the installation hole 15 through a plurality of bearings, which is used to reduce friction and make the rotation of the rotating shaft 701 easier.

[0027] Further, an annular baffle 16 is formed in the receiving hole 3. The planar thrust bearing 8 is arranged above the baffle 16 and is in contact with the baffle 16. The baffle 16 is used to support and fix the planar thrust bearing 8. The baffle 16 and the planar thrust bearing 8 are located above the second bevel gear 703. The planar thrust bearing 8 provides a downward thrust. Among them, the screw rod 4 has a margin for downward movement in the receiving hole 3 and can drive the screw rod 4 and the second bevel gear 703 to be finely adjusted downward under the action of the planar thrust bearing 8.

[0028] Specifically, a matching limiting ring 17 is formed at the end of the lifting rod 5 and the receiving hole 3 to prevent the lifting rod 5 from disengaging.

[0029] As Figure 1 shown, a support base 18 is arranged at the bottom of the bottom support rod 1 to provide support, and the top of the lifting rod 5 can be fixed to the desk body 19 or the chair surface.

[0030] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present application. The foregoing embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A lifting and adjusting mechanism for desks and chairs, characterized in that, Comprising: Bottom support rods, arranged in pairs and connected by an intermediate connecting rod, with accommodation holes formed thereon, and a screw rod is rotatably arranged in the accommodation holes; Lifting rods, sliding in the accommodation holes, with threaded holes formed at their bottoms, and the lifting rods realize up-and-down sliding through the cooperation of the threaded holes and the screw rods; A lifting mechanism, installed in the intermediate connecting rod and the bottom support rods, includes a rotating shaft, a first bevel gear and a second bevel gear. The rotating shaft rotates in the intermediate connecting rod, and first bevel gears are installed at both ends thereof. The second bevel gear is fixed on the screw rod and meshes with the first bevel gear. A flat thrust bearing is arranged on the screw rod to provide thrust to press the second bevel gear and the first bevel gear, and the lifting rod is driven to move up and down by rotating the rotating shaft; A driving mechanism, arranged on the intermediate connecting rod, includes a worm gear, a worm and a rocking handle. The worm gear is fixed on the rotating shaft, the worm is fixed at the end of the rocking handle and meshes with the worm gear. The rocking handle rotates on the intermediate connecting rod, and the rotating shaft is driven to rotate by rotating the rocking handle, thereby driving the lifting mechanism to work; A handle locking mechanism is further arranged on the intermediate connecting rod for locking the rocking handle.

2. The lifting and adjusting mechanism of a desks and chairs according to claim 1, characterized in that The handle locking mechanism includes: A fixed seat, fixed on the intermediate connecting rod, the rocking handle penetrates through the fixed seat, and a chute is formed thereon; A locking member, sliding in the chute, and a locking rod is formed thereon.

3. The lifting and adjusting mechanism of a desks and chairs according to claim 2, characterized in that, A number of locking holes matching the locking rod are formed on the rocking handle, and the rocking handle is locked by pushing the locking rod into the locking holes.

4. The lifting and adjusting mechanism of a desk and chair according to claim 3, characterized in that, A limiting hole communicating with the chute is formed on the fixed seat, and the locking rod slides in the limiting hole.

5. The lifting and adjusting mechanism of a desk and chair according to claim 1, characterized in that, An installation hole is formed in the intermediate connecting rod, and the rotating shaft rotates in the installation hole through a number of bearings.

6. The lifting and adjusting mechanism of a desk and chair according to claim 1, characterized in that, An annular baffle is formed in the accommodation hole, and the flat thrust bearing is arranged above the baffle and kept in contact with the baffle.

7. The lifting and adjusting mechanism of a school desk and chair according to claim 1, characterized in that, Matching limiting rings are formed at the ends of the lifting rod and the accommodation hole to prevent the lifting rod from detaching.

8. The lifting and adjusting mechanism of a school desk and chair according to claim 1, characterized in that, A support base is arranged at the bottom of the bottom support rod, and the top of the lifting rod can be fixed to the desk body or the chair surface.

Images