CN217271247U

CN217271247U - Lifting upright post capable of realizing one-way speed reduction

Info

Publication number: CN217271247U
Application number: CN202220866188.8U
Authority: CN
Inventors: 林煜畅
Original assignee: Timotion Technology Co Ltd
Current assignee: Timotion Technology Co Ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-23
Anticipated expiration: 2032-04-15

Abstract

The application provides a lifting upright post capable of achieving one-way speed reduction, which comprises a telescopic pipe assembly, a transmission mechanism and a motor, wherein the telescopic pipe assembly comprises an outer pipe, an inner pipe and a lead screw, the inner pipe is telescopically arranged in the outer pipe and is in threaded connection with the lead screw, the transmission mechanism is arranged at one end of the telescopic pipe assembly and comprises a box body, a worm wheel and a spiral spring, the worm wheel is fixedly sleeved on the lead screw and is accommodated in the box body, the spiral spring is wound around a ring to form the worm wheel, one end of the spiral spring is fixed in the box body, the motor is arranged in the box body and is in meshed transmission with the worm wheel, when the worm wheel rotates towards one direction, the spiral spring radially expands to release the worm wheel, and when the worm wheel rotates towards the other direction, the spiral spring radially contracts to tightly press the worm wheel; therefore, the lifting upright post can be decelerated in one direction to facilitate the operation of a user, and the motor is prevented from generating high-speed friction during deceleration.

Description

Lifting upright post capable of realizing one-way speed reduction

Technical Field

The application relates to a lifting stand column, in particular to a lifting stand column capable of achieving one-way speed reduction.

Background

The lifting upright post is widely applied to the fields of medical beds, electric tables, electric furniture and the like, and the telescopic upright post is extended or shortened after the speed of the motor is reduced, so that the effect of adjusting the height or the angle is achieved. However, when a general lifting column is braked, the speed of the lifting column is directly reduced by a brake pad through a driving shaft core of a motor, so that the speed of the lifting column cannot be reduced in a single direction according to requirements; in addition, because the rotating speed of the driving shaft core of the motor is high, high-speed friction between the brake pad and the driving shaft core during deceleration is easy to generate high temperature to vaporize the lubricant, and further the service life and the efficiency are influenced.

In view of the above, the present inventors have made extensive studies to solve the above problems in view of the above drawbacks of the prior art and by applying the principles of the present invention, and thus, the present inventors have made an improvement.

SUMMERY OF THE UTILITY MODEL

The main purpose of the present application is to enable the lifting column to perform one-way deceleration during extension and retraction, thereby facilitating the operation of a user and avoiding high-speed friction during deceleration.

In order to achieve the purpose, the application provides a lifting upright post capable of achieving one-way speed reduction, which comprises a telescopic tube assembly, a transmission mechanism and a motor, wherein the telescopic tube assembly comprises an outer tube, an inner tube and a lead screw, the inner tube is telescopically arranged in the outer tube and is in threaded connection with the lead screw, the transmission mechanism is arranged at one end of the telescopic tube assembly and comprises a box body, a worm wheel and a spiral spring, the worm wheel is fixedly sleeved on the lead screw and is accommodated in the box body, the spiral spring is wound and annularly provided with the worm wheel, one end of the spiral spring is fixed on the box body, the motor is arranged in the box body and is in meshed transmission with the worm wheel, and when the worm wheel rotates towards one direction, the spiral spring radially expands to release the worm wheel; when the worm wheel rotates in the other direction, the spiral spring will contract radially to press the worm wheel tightly.

In one embodiment, the coil spring has a fixed end, and the box body is provided with a clamping groove, and the fixed end is clamped in the clamping groove.

In one embodiment, the transmission mechanism further comprises an upper cover, the upper cover covers the box body and limits the fixed end together with the clamping groove.

In one embodiment, the inner tube is provided with an internal thread and the lead screw is provided with an external thread, the external thread corresponding to the internal thread for screw-on transmission.

In one embodiment, the motor has a drive worm located within the housing and engaging the worm gear.

In one embodiment, the drive worm is provided with a worm toothing, the worm wheel is provided with a helical toothing, and the helical toothing engages the worm toothing.

In one embodiment, the worm wheel is convexly provided with a sleeve part, the outer diameter of the sleeve part is smaller than that of the inclined tooth part, and the spiral spring is wound around the sleeve part.

In one embodiment, the worm gear is provided with a transmission groove, and the lead screw is provided with a transmission end which is fixedly connected in the transmission groove.

In one embodiment, the drive socket is a regular polygon.

In one embodiment, the housing has a receiving slot, and the worm gear is rotatably received in the receiving slot.

The application also has the following effects: the consumption of lubricating oil due to high-temperature vaporization can be reduced and the service life of the product can be prolonged by the speed reduction mode of radial contraction of the worm wheel by the spiral spring. The fixed end of the spiral spring can be limited by the clamping groove of the upper cover and the box body, so that the spiral spring is prevented from jumping out. The helical spring can be sleeved and fixed by the sleeve joint part with the outer diameter smaller than the inclined tooth part. The annular convex block of the upper cover can limit the position of the positioning part corresponding to the worm wheel to prevent the worm wheel from rotating obliquely.

Drawings

Fig. 1 is a perspective external view of the present application.

Fig. 2 is an exploded perspective view of the transmission mechanism and the motor of the present application.

Fig. 3 is a partial perspective view of the transmission mechanism and the motor according to the present invention.

Fig. 4 is a sectional view of the transmission mechanism and the motor of the present application.

Fig. 5 is a cross-sectional view of the present application.

Description of reference numerals:

10: a telescoping tube assembly;

11: an outer tube;

12: an inner tube;

121: an internal thread;

13: a lead screw;

131: an external thread;

132: a transmission end;

20: a transmission mechanism;

21: a box body;

211: a containing groove;

212: a card slot;

22: a worm gear;

221: a helical tooth portion;

222: a socket joint part;

223: a positioning part;

224: a transmission groove;

23: a coil spring;

231: a fixed end;

24: an upper cover;

241: an annular projection;

30: an electric motor;

31: a drive worm;

311: a spiral tooth portion;

a: and (4) bolts.

Detailed Description

The detailed description and technical contents of the present application will be described below with reference to the accompanying drawings, which are provided for illustrative purposes only and are not intended to limit the present application.

The present invention provides a lifting column capable of one-way deceleration, as shown in fig. 1 to 5, which mainly comprises a telescopic tube assembly 10, a transmission mechanism 20 and a motor 30.

The telescoping tube assembly 10 includes an outer tube 11, an inner tube 12, and a lead screw 13. The outer tube 11 and the inner tube 12 are hollow cylindrical tubes, and the outer tube 11 and the inner tube 12 in this embodiment are hollow cylinders, but the present application is not limited thereto. The inner tube 12 is telescopically disposed within the outer tube 11 and threadedly engaged with the lead screw 13. Specifically, the inner edge of the inner tube 12 is provided with an internal thread 121, and the outer edge of the lead screw 13 is provided with an external thread 131 corresponding to the internal thread 121. The internal thread 121 on the inner edge of the inner tube 12 can be screwed on the external thread 131 on the outer edge of the lead screw 13 for transmission, so that the lead screw 13 can drive the inner tube 12 to extend or retract in the outer tube 11 when rotating.

The transmission mechanism 20 is disposed at one end of the telescopic tube assembly 10, and the transmission mechanism 20 mainly includes a box 21, a worm wheel 22 and a coil spring 23. The case 21 has a receiving groove 211. The worm wheel 22 is fixedly sleeved on one end of the lead screw 13 and rotatably accommodated in the accommodating groove 211 of the box body 21. The coil spring 23 is wound around the worm wheel 22, and the coil spring 23 has a fixed end 231 fixed to the case 21. Specifically, the fixed end 231 is elongated, the housing 21 is provided with a notch 212, and the fixed end 231 of the coil spring 23 is engaged with the notch 212. Preferably, the transmission mechanism 20 further includes an upper cover 24. The upper cover 24 covers the case 21 and limits the fixed end 231 of the coil spring 23 together with the slot 212, and covers the worm wheel 22 in the accommodating slot 211, so as to effectively prevent the fixed end 231 of the coil spring 23 from jumping out of the slot 212, and prevent dust or foreign matters from invading the worm wheel 22 to affect the operation. Preferably, the upper cover 24 can be fastened to the case 21 by a plurality of (at least two) bolts a.

The motor 30 is disposed at one side of the case 21 and is engaged with the worm wheel 22. Specifically, the electric motor 30 is a motor and has a driving worm 31, and the driving worm 31 is located in the case 21 and engages the worm wheel 22. The motor 30 can drive the worm 31 to rotate the worm wheel 22, and the lead screw 13 fixed to the worm wheel 22 rotates together with the worm wheel, thereby causing the inner tube 12 screwed to the outer edge of the lead screw 13 to extend or contract with respect to the outer tube 11.

When the motor 30 drives the worm wheel 22 to rotate in one direction, the coil spring 23 will expand radially to release the worm wheel 22, so that the lead screw 13 can smoothly drive the inner tube 12 to move relative to the outer tube 11. When the worm wheel 22 is driven by the motor 30 to rotate in the other direction, the coil spring 23 will contract radially to press the worm wheel 22, so that the lead screw 13 rotates slowly to slow down the movement of the inner tube 12 relative to the outer tube 11. Therefore, the designer can select the inner tube 12 to form a one-way deceleration when extending or retracting according to the requirement, thereby facilitating the operation of the user and optimizing the use experience of the lifting column. And the speed reduction mode that the worm wheel 22 is radially contracted by the spiral spring 23 avoids the problem that the lubricating oil is vaporized due to high temperature during high-speed friction, thereby greatly prolonging the service life of the product.

Further, the worm wheel 22 includes a helical tooth portion 221, a fitting portion 222, and a positioning portion 223. The helical teeth 221 are provided on the outer periphery of the worm wheel 22 so as to be capable of meshing with the helical teeth 311 of the driving worm 31 of the motor 30. The engaging portion 222 protrudes from one side of the worm wheel 22, and an outer diameter of the engaging portion 222 is smaller than an outer diameter of the helical tooth portion 221, so that the coil spring 23 can be engaged and fixed on the engaging portion 222. The positioning portion 223 protrudes and extends from one side of the socket portion 222 away from the worm wheel 22, and the outer diameter of the positioning portion 223 is smaller than that of the socket portion 222, so that the annular protrusion 241 of the upper cover 24 can limit the position of the positioning portion 223 to prevent the worm wheel 22 from rotating obliquely. A transmission groove 224 is formed in the center of the worm wheel 22, and the lead screw 13 has a transmission end 132 fixedly inserted into the transmission groove 224. Preferably, the drive slot 224 is a non-circular slot. In the present embodiment, the driving groove 224 is a regular hexagon, and the cross section of the driving end 132 of the lead screw 13 is also a regular hexagon, but the present application is not limited thereto, and other regular polygons may be adopted as long as the driving groove 224 and the driving end 132 of the lead screw 13 do not slip with each other.

In summary, the present application has industrial applicability, novelty and advancement, and completely meets the requirements of patent application, and is applied by the following patent law. The present application is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the present application.

Claims

1. The utility model provides a lift stand that can one-way speed reduction which characterized in that includes:

the telescopic pipe assembly comprises an outer pipe, an inner pipe and a lead screw, wherein the inner pipe is telescopically arranged in the outer pipe and is in threaded connection with the lead screw;

the transmission mechanism is arranged at one end of the telescopic pipe assembly and comprises a box body, a worm wheel and a spiral spring, the worm wheel is fixedly sleeved on the guide screw rod and accommodated in the box body, the spiral spring is wound and annularly provided with the worm wheel, and one end of the spiral spring is fixed on the box body; and

the motor is arranged in the box body and is in meshed transmission with the worm wheel;

wherein when the worm gear is rotated in one direction, the coil spring will radially expand to release the worm gear; when the worm wheel rotates in the other direction, the helical spring will contract radially to tighten the worm wheel.

2. A lifting column capable of achieving one-way deceleration according to claim 1, wherein said coil spring has a fixing end, said housing is provided with a locking slot, and said fixing end is locked in said locking slot.

3. The lifting column capable of achieving one-way deceleration as claimed in claim 2, wherein the transmission mechanism further comprises an upper cover, the upper cover covers the box body and cooperates with the locking groove to limit the fixed end.

4. A lifting column capable of achieving one-way deceleration as claimed in claim 1, wherein the inner tube is provided with internal threads, and the lead screw is provided with external threads, and the external threads correspond to the internal threads for screw transmission.

5. A unidirectionally decelerable lifting column as in claim 1, wherein said motor has a drive worm located within said box and engaging said worm gear.

6. The lifting column capable of achieving one-way deceleration as claimed in claim 5, wherein the driving worm is provided with a worm gear portion, and the worm wheel is provided with a helical gear portion, and the helical gear portion is engaged with the worm gear portion.

7. The lifting upright post capable of realizing one-way deceleration as claimed in claim 6, wherein the worm wheel is convexly provided with a sleeve joint part, the outer diameter of the sleeve joint part is smaller than that of the helical tooth part, and the helical spring is wound around the sleeve joint part.

8. The lifting column capable of achieving one-way speed reduction according to claim 1, wherein a transmission groove is formed in the worm wheel, the lead screw is provided with a transmission end, and the transmission end is fixedly connected in the transmission groove.

9. A unidirectional decelerable lifting column as claimed in claim 8 wherein the drive slot is a regular polygon.

10. A lifting column capable of achieving one-way deceleration as claimed in claim 1, wherein the box body is provided with a containing groove, and the worm wheel is rotatably accommodated in the containing groove.