A lifting column

Abstract

The present disclosure provides a lifting column, belonging to the technical field of lifting equipment, which includes: a driving tube, the driving tube supports the ground; an outer tube, the outer tube is sleeved outside the driving tube, and the outer tube can be lifted and lowered; a first fastener, the first fastener is installed between the driving tube and the outer tube, and the position of the first fastener relative to the driving tube is fixed; a second fastener, the second fastener is installed between the driving tube and the outer tube, and the position of the second fastener relative to the outer tube is fixed; wherein the second fastener is provided with an auxiliary locking piece, and the auxiliary locking piece is used to manually lock the outer tube. The lifting column provided by the present disclosure has a wider adjustable range of height, and it is not easy to shake between the outer tube and the driving tube, and the lifting column is more stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of lifting equipment, and more specifically relates to a lifting column. Background Art

[0002] Electric lifting columns are widely used in home, medical and other fields. The pipe body of the existing electric lifting columns generally includes at least three layers of pipe body from the inside to the outside, and the structure of the lifting column is relatively complex.

[0003] For example, the patent with publication number CN212233583U provides an anti-rotation structure for a lifting table and a round tube lifting column, including: an inner tube, an end cover and a driving tube, the inner tube is sleeved on one end of the driving tube, the end of the inner tube is clamped with the end cover, the driving tube passes through the limit clamp hole on the end cover, and the limit clamp hole is used to limit the rotation of the driving tube. The utility model provides an anti-rotation structure and a round tube lifting column, the end cover is engaged with the inner tube, so that the end cover will not rotate, the end cover prevents the driving tube from rotating through the limit clamp hole, so that the driving tube will not rotate relative to the inner tube. Compared with the existing anti-rotation structure, this structure is simpler, and thus easy to process and low in cost. However, in this disclosure, the length of the inner tube is short, and the distance between the fastening points between the inner tube and the outer tube is short, which makes it easy for the inner and outer tubes to shake, the lifting column is not stable enough, and the lifting range is small.

[0004] In the prior art, the lifting column is usually composed of a driving tube, an inner tube and an outer tube. There are problems such as shaking between the inner tube and the outer tube, the lifting column is not stable enough and the lifting range is small. Summary of the invention

[0005] The present invention aims to solve the problem in the prior art that the inner tube and the outer tube of the lifting column are prone to shaking and the lifting column is not stable enough, and provides a lifting column which is not prone to shaking and has better supporting stability.

[0006] One of the concepts of the present disclosure is that the driving tube is used to support the ground, and the outer tube is used for lifting. By installing the first fastener and the second fastener between the driving tube and the outer tube, the lifting column structure is simplified, the manufacturing cost is reduced, and the friction between the driving tube and the outer tube is reduced, thereby preventing the lifting column from getting stuck when extending and retracting.

[0007] Another concept of the present disclosure is that the second fastener is provided with an auxiliary locking mechanism, which is used to manually lock the outer tube to prevent the outer tube from sliding down, thereby making the lifting column more stable.

[0008] Furthermore, another concept of the present disclosure is that the auxiliary locking member is provided with a drawstring and a first inclined surface. The second fastener is provided with a second inclined surface corresponding to the first inclined surface. By pulling the drawstring downward, the first inclined surface moves downward relative to the second inclined surface, so that the outer tube and the driving tube generate a greater squeezing force on the second fastener, thereby preventing the outer tube from sliding down.

[0009] Another concept of the present disclosure is that the first fastener is fixed to the top of the driving tube; the second fastener is fixed to the bottom of the outer tube. The first fastener and the second fastener are spaced relatively far apart, so that the height of the lifting column can be adjusted in a wider range, the outer tube and the driving tube are not prone to shaking, and the lifting column is more stable.

[0010] Furthermore, another concept of the present disclosure is that the first fastener and / or the second fastener are installed through an easily detachable structure, which has a simple installation method and is convenient for assembly and disassembly.

[0011] Another concept of the present disclosure is that the lifting column is lifted and lowered by a motor-driven screw rod, and the screw rod is connected to a transmission nut and a self-locking device. Under the action of the transmission nut, when the outer tube descends relative to the driving tube, the screw rod must be reversed, and the self-locking device is used to prevent the screw rod from reversing, thereby achieving the height locking of the lifting column. It can effectively prevent the outer tube from sliding down when the motor is not in operation, and the lifting column is stable and reliable.

[0012] The present disclosure provides a lifting column, comprising an outer tube and a driving tube. The outer tube is sleeved outside the driving tube, the driving tube supports the ground, and the outer tube and the driving tube can be relatively telescopic. Among them, a first fastener and a second fastener are installed between the outer wall of the driving tube and the inner wall of the outer tube, and the first fastener is arranged above the second fastener. When the outer tube is raised or lowered, the second fastener is raised or lowered with the outer tube, and the first fastener is fixed on the driving tube without changing its height. The first fastener and the second fastener serve as fastening points between the outer tube and the driving tube, reducing the resistance between the inner wall of the outer tube and the outer wall of the driving tube when the outer tube is raised or lowered, and the spacing between the two fastening points (the first fastener and the second fastener) can be set larger, the torque is increased, the outer tube is less likely to shake relative to the driving tube, and the lifting range of the lifting column is larger.

[0013] Furthermore, the first fastener can be arranged at the top end of the driving tube, and the second fastener can be arranged at the end of the outer tube, so that the height of the lifting column can be adjusted in a wider range and the lifting column is more stable.

[0014] Furthermore, compared with the prior art structure in which the lifting column is provided with a driving tube, an inner tube and an outer tube from the inside to the outside, the present invention omits the original inner tube, simplifies the lifting column structure and reduces the manufacturing cost.

[0015] Furthermore, the lifting column is also provided with an auxiliary locking piece, which is arranged on the second fastener and is used to manually lock the outer tube to prevent the outer tube from sliding down and stabilize the height of the desktop.

[0016] In some embodiments, the auxiliary locking member is provided with a drawstring and a first inclined surface, the second fastener is provided with a second inclined surface corresponding to the first inclined surface, and a slide groove and a through hole for limiting the auxiliary locking member, the drawstring passes through the through hole, and the drawstring is exposed under the outer tube.

[0017] Furthermore, the drawstring is provided with oblique teeth, and the second fastener is provided with latching teeth corresponding to the oblique teeth. The oblique teeth cooperate with the latching teeth so that the drawstring can only move downward, which is used to lock the position of the drawstring.

[0018] Furthermore, the number of the bevel teeth may be multiple, and the drawstring may be locked at multiple positions, so that the auxiliary locking member may stay at different positions of the slide slot, so that the first bevel and the second bevel are in different fitting conditions.

[0019] Furthermore, a gap is left between the drawstring and the outer wall of the driving tube, making it more convenient to grab the drawstring.

[0020] Preferably, as the pull belt is pulled downward, the second fastener and the auxiliary locking member are tightly combined, and the cross-sectional area of ​​the two in the horizontal plane increases, so that the outer tube and the drive tube produce a greater squeezing force on the second fastener, and a greater friction force is generated when the outer tube slides down, thereby preventing the outer tube from sliding down.

[0021] Furthermore, the drawstring is provided with a protrusion, and the protrusion is used to increase the friction between the drawstring and the hand.

[0022] In some embodiments, the first fastener may also be provided with an auxiliary locking member based on the same principle.

[0023] In some embodiments, the first fastener is installed on the driving tube through a snap-fit ​​structure to facilitate installation and disassembly.

[0024] Furthermore, the first fastener is provided with a first hook, and the drive tube is provided with a corresponding first slot.

[0025] In some embodiments, the second fastener is installed on the outer tube through a snap-fit ​​structure, and the installation structure is simple and easy to install and disassemble.

[0026] Furthermore, the second fastener is provided with a second hook, and the outer tube is provided with a corresponding second groove.

[0027] In some embodiments, the lifting column is lifted and lowered by a motor-driven lead screw, and the lead screw is connected to a transmission nut and a self-locking device. Under the action of the transmission nut, when the outer tube descends relative to the driving tube, the lead screw must be reversed, and the self-locking device is used to prevent the lead screw from reversing, thereby achieving height locking of the lifting column, effectively preventing the desktop from sliding down when the motor is not working, and the lifting column is stable and reliable.

[0028] Furthermore, the self-locking device includes a one-way bearing and an in-tube retaining member, wherein the one-way bearing is sleeved outside the screw rod, and the in-tube retaining member is installed outside the one-way bearing.

[0029] Furthermore, the one-way bearing includes an outer ring and an inner ring, and the inner ring is sleeved on the screw. When the screw rises relative to the drive tube, the screw rotates forward, the inner ring of the one-way bearing rotates with the screw, and the outer ring does not move; when the screw falls relative to the drive tube, the screw reverses, and the inner ring and outer ring of the one-way bearing have the same movement trend.

[0030] The inner tube retainer is divided into two halves. After the inner tube retainer is clamped, friction damping is generated on the outer ring of the one-way bearing to prevent the outer ring of the one-way bearing from rotating.

[0031] Furthermore, the in-tube retaining member is provided with an end face which is in contact with the inner wall of the driving tube, and the end face is used to prevent the in-tube retaining member from rotating relative to the driving tube, thereby preventing the screw rod from reversing. The self-locking device has a simple structure and a large self-locking force, so that the lifting column has good load-bearing capacity and stability, and the table top will not slide down.

[0032] Compared with the prior art, the present invention provides a lifting column, which uses a driving tube to support the ground, an outer tube is sleeved outside the driving tube, and a first fastener and a second fastener are provided as fastening points between the outer tube and the driving tube. The height can be adjusted in a wider range, the torque is large, the outer tube and the driving tube are not prone to shaking, and the lifting column is more stable; an auxiliary locking piece is provided, which can manually lock the outer tube to prevent the outer tube from sliding down, thereby further increasing the stability of the lifting column. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present disclosure. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0034] Figure 1 : A side view of a lifting column provided by the present disclosure;

[0035] Figure 2: A cross-sectional view of a lifting column provided by the present disclosure;

[0036] Figure 3 : A schematic diagram of the internal structure of a lifting column provided by the present invention;

[0037] Figure 4 : Figure 1 A magnified view of the local structure;

[0038] Figure 5 : Figure 3 A magnified view of the local structure;

[0039] Figure 6 : A schematic diagram of the installation structure of the first fastener provided by the present disclosure;

[0040] Figure 7 : A schematic structural diagram of a first fastener provided by the present disclosure;

[0041] Figure 8 : A schematic diagram of the structure of the self-locking device provided by the present disclosure;

[0042] Fig. 9 : A schematic diagram of the structure of the transmission nut provided by the present invention;

[0043] Among them, 1. outer tube; 2. driving tube; 3. self-locking device; 4. first fastener; 5. second fastener; 6. transmission nut; 7. reinforcement plate; 8. auxiliary locking member;

[0044] 41, first hook; 51, second hook; 52, step; 53, second inclined surface; 81, first inclined surface;

[0045] 31. In-tube retainer; 31a. First retainer; 31b. Second retainer; 311. End face; 32. One-way bearing; 33. Third fastener. DETAILED DESCRIPTION

[0046] The present disclosure is described in detail below in conjunction with the accompanying drawings.

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0048] Embodiment 1: The present invention provides a lifting column, comprising an outer tube 1 and a driving tube 2, wherein the driving tube 2 supports the ground, the outer tube 1 is sleeved outside the driving tube 2, and a first fastener 4 and a second fastener 5 are installed between the driving tube 2 and the outer tube 1, wherein the first fastener 4 is arranged above the second fastener 5, and when the outer tube 1 is lifted and lowered relative to the driving tube 2, the second fastener 5 is lifted and lowered along with the outer tube 1, and the position of the first fastener 4 remains unchanged, and the arrangement of the first fastener 4 and the second fastener 5 leaves a gap between the outer tube 1 and the driving tube 2, which reduces the resistance to the lifting of the outer tube 1 compared with the conventional structure in which the inner tube and the outer tube are fitted together through the tube wall, and the spacing distance between the first fastener 4 and the second fastener 5 is larger, so that the height adjustable range of the lifting column is wider, the outer tube 1 and the driving tube 2 are not prone to shaking, and the lifting column is more stable, and, compared with the structure of the lifting column in the prior art, the present invention omits the original inner tube, simplifies the lifting column structure, and reduces the manufacturing cost.

[0049] The lifting column is provided with an auxiliary locking member 8 , and the auxiliary locking member 8 is arranged on the second fastening member 5 .

[0050] like Figure 4 As shown, the auxiliary locking member 8 is arranged on the second fastener 5, and the auxiliary locking member 8 is provided with a drawstring for convenient hand force application, and the drawstring is exposed under the outer tube 1. When the height of the desktop is adjusted to a commonly used height, the drawstring can be pulled downward, which can increase the sliding friction between the outer tube 1 and the driving tube 2, lock the outer tube, and prevent the outer tube from sliding down.

[0051] More specifically, Figure 5 As shown, the auxiliary locking member 8 is provided with a first inclined surface 81, and the first inclined surface 81 makes the auxiliary locking member 8 thicker at the top and thinner at the bottom. The second fastener 5 is provided with a second inclined surface 53 matching the first inclined surface 81. When the drawstring is pulled downward, the first inclined surface 81 slides down relative to the second inclined surface 53, and the second fastener 5 and the auxiliary locking member 8 are tightly combined. The cross-sectional area of ​​the two on the horizontal plane increases, which produces greater extrusion on the outer tube 1 and the driving tube 2. When the outer tube slides down, it will be subjected to greater friction damping. The auxiliary locking member 8 can effectively lock the outer tube to prevent the outer tube from sliding down, and has a simple structure and is easy to operate.

[0052] Furthermore, the drawstring is provided with a plurality of oblique teeth, and the second fastener 5 is provided with latching teeth corresponding to the oblique teeth, and the oblique teeth cooperate with the latching teeth so that the drawstring can only move downward and can be locked in multiple positions. The auxiliary locking member 8 can stay at different positions of the slide slot, so that the first inclined surface and the second inclined surface are in different fitting conditions.

[0053] Furthermore, a gap is left between the drawstring and the outer wall of the driving tube 2, making it more convenient to grab the drawstring.

[0054] Preferably, as the pull strap is pulled downward, the second fastener 5 and the auxiliary locking piece 8 are tightly combined, and the cross-sectional area of ​​the two in the horizontal plane increases, so that the outer tube 1 and the driving tube 2 produce a greater squeezing pressure on the second fastener 5, and a greater friction force is generated when the outer tube 1 slides down, thereby preventing the outer tube from sliding down.

[0055] Furthermore, the drawstring is provided with a protrusion, and the protrusion is used to increase the friction between the drawstring and the hand.

[0056] In other embodiments, the first fastener 4 may also be provided with an auxiliary locking member based on the same principle.

[0057] Embodiment 2: Based on Embodiment 1, the present disclosure can further define the installation method and specific structure of the first fastener 4 and the second fastener 5. The first fastener 4 is arranged at the top of the driving tube 2, and the second fastener 5 is arranged at the end of the outer tube 1. The distance between the first fastener 4 and the second fastener 5 is large, so that the height of the lifting column can be adjusted in a wider range, and the torque between the two fastening points is large, and the outer tube 1 and the driving tube 2 are not easy to shake, and the lifting column is more stable.

[0058] Furthermore, the first fastener 4 and the second fastener 5 are installed through an easily detachable structure, and the easily detachable structure includes a snap connection and a threaded connection, and the installation method is simple and the disassembly and assembly are convenient.

[0059] like Figure 7 As shown, the first fastener 4 can be installed on the driving tube 2 through a snap-fit ​​structure, which is convenient for installation and disassembly.

[0060] The first fastener 4 is provided with a first hook 41 , and the driving tube 2 is provided with a corresponding first slot.

[0061] The first fastener 4 is provided with anti-skid protrusions, which are in a grid shape and are used to increase the friction with the inner wall of the outer tube 1 .

[0062] like Figure 4 , Figure 5 As shown, the second fastener 5 can be installed on the outer tube 1 through a snap-fit ​​structure, the installation structure is simple, and installation and disassembly are convenient.

[0063] The second fastener 5 is provided with a second hook 51 , and the outer tube 1 is provided with a corresponding second groove.

[0064] In a natural state, the second buckle is warped outwards, so that the buckle can be automatically inserted into the second buckle slot.

[0065] The top of the second fastener 5 is provided with a chamfer, so that the outer tube 1 can be inserted into the second fastener 5 from top to bottom, which is convenient for installation.

[0066] The second fastener 5 is provided with a step 52 for bearing the weight and limiting the position of the outer tube 1 .

[0067] Compared with the prior art, the lifting column provided by the present invention has a wider range of height adjustment, is less likely to shake between the outer tube 1 and the driving tube 2, and is more stable.

[0068] Embodiment 3: Based on the above embodiments, the present disclosure can further provide a lifting drive mechanism for a lifting column. The lifting column is lifted and lowered by a motor driving a screw rod, and the screw rod is connected with a transmission nut 6 and a self-locking device 3 .

[0069] like Figure 6 , Fig. 9 As shown, the transmission nut 6 is fixed to the top of the driving tube 2 by bolts. The transmission nut 6 includes an inner core and an outer shell. The inner core is provided with an internal thread engaged with the screw rod. The outer shell is installed on the driving tube 2 by a bolt structure, so that the transmission nut 6 cannot be displaced relative to the driving tube 2.

[0070] like Figure 8 As shown, the self-locking device 3 includes a one-way bearing 32 and an inner tube retainer 31 . The one-way bearing 32 is sleeved outside the screw rod, and the inner tube retainer 31 is installed outside the one-way bearing 32 .

[0071] The self-locking device 3 is arranged at the end of the screw rod, and the self-locking device 3 is fixed to the end of the screw rod through a third fastener 33 .

[0072] The one-way bearing 32 includes an outer ring and an inner ring, and the inner ring is sleeved on the screw. When the screw rises relative to the drive tube 2, the screw rotates forward, and the inner ring of the one-way bearing 32 rotates with the screw, while the outer ring does not move; when the screw falls relative to the drive tube 2, the screw reverses, and the inner ring and outer ring of the one-way bearing 32 have the same movement trend.

[0073] The inner tube retainer 31 is divided into two halves, including a first retainer 31a and a second retainer 31b. After being clamped, the inner tube retainer 31 generates friction damping with the outer ring of the one-way bearing 32 to prevent the outer ring of the one-way bearing 32 from rotating relative to the inner tube retainer 31.

[0074] The inner retaining member 31 can be set to be split left and right or split up and down, and the first retaining member 31a and the second retaining member 31b are fastened and connected by a threaded structure.

[0075] Furthermore, the in-tube retaining member 31 is provided with an end face 311 which is in contact with the inner wall of the driving tube 2. The end face 311 is used to prevent the in-tube retaining member 31 from rotating relative to the driving tube 2, thereby preventing the screw rod from reversing. The self-locking device 3 has a simple structure and a large self-locking force, so that the lifting column has good load-bearing capacity and stability, and the table top will not slide down.

[0076] The inner tube retainer 31 is provided with an anti-skid surface, which is used to increase the friction between the inner tube retainer 31 and the one-way bearing 32 to prevent slipping.

[0077] When the outer tube 1 descends relative to the driving tube 2, the screw rod reverses, and the self-locking device 3 is used to prevent the screw rod from reversing, thereby achieving height locking of the lifting column, effectively preventing the desktop from sliding down when the motor is not working, and the lifting column is stable and reliable.

[0078] Furthermore, the driving tube 2 is provided with a reinforcing plate 7 , which is installed inside the driving tube 2 to prevent the driving tube 2 from deforming and increase the stability of the driving tube 2 .

[0079] The present disclosure is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the present disclosure and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the scope of protection of the claims of the present disclosure.

Claims

1. A lifting column, characterized in that: include: a drive tube, the drive tube supporting the ground; An outer tube, which is sleeved outside the driving tube and can be raised and lowered; a first fastener, the first fastener being installed between the driving tube and the outer tube, and the first fastener being fixed relative to the driving tube; a second fastener, the second fastener being installed between the driving tube and the outer tube, and the second fastener being fixed relative to the outer tube; Wherein, the second fastener is provided with an auxiliary locking piece, and the auxiliary locking piece is used to manually lock the outer tube; The auxiliary locking piece is provided with a drawstring, the auxiliary locking piece is provided with a first inclined surface, the second fastener is provided with a second inclined surface corresponding to the first inclined surface, and a slide groove and a through hole for limiting the auxiliary locking piece, the drawstring passes through the through hole and is exposed outside the outer tube.

2. A lifting column according to claim 1, characterized in that: The drawstring is provided with at least one oblique tooth, and the second fastener is provided with a latching tooth corresponding to the oblique tooth, and the oblique tooth cooperates with the latching tooth to lock the position of the drawstring.

3. A lifting column according to claim 2, characterized in that: The drawstring is provided with a protrusion, and the protrusion is used to increase the friction between the drawstring and the hand.

4. A lifting column according to claim 1, characterized in that: The top end of the second fastener is provided with a chamfer, and the second fastener is also provided with a step, and the step is in contact with the bottom surface of the outer tube and is used to limit the outer tube.

5. A lifting column according to claim 1, characterized in that: The first fastener is arranged at the top end of the driving tube; and the second fastener is arranged at the end of the outer tube.

6. A lifting column according to claim 1, characterized in that: The first fastener is provided with a first hook, and the driving tube is provided with a corresponding first slot; the second fastener is provided with a second hook, and the outer tube is provided with a corresponding second slot.

7. A lifting column according to claim 1, characterized in that: The first fastener is also provided with an auxiliary locking member.

8. The lifting column according to claim 1, characterized in that: The lifting column also includes a motor and a screw rod. The screw rod is connected with a transmission nut and a self-locking device. The self-locking device cooperates with the transmission nut to prevent the screw rod from reversing.

9. A lifting column according to claim 8, characterized in that: The self-locking device comprises a one-way bearing and an inner tube retainer, wherein the one-way bearing is sleeved outside the screw rod, the inner tube retainer is installed outside the one-way bearing, and the inner tube retainer is provided with an end face that fits the inner wall of the driving tube.

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