Synchronous height adjustable desk

Abstract

This invention relates to a synchronous height-adjustable table, belonging to the field of daily necessities. It includes legs, a desktop (3), a drive shaft (8), a flexible rope (9), and a rotation drive device. The legs include an upper support (2) and a lower support (1) that are slidably connected. The drive shaft (8) is located inside one side of the lower support (1) and is threadedly connected thereto. The upper end of the drive shaft (8) is in contact with the desktop (3), and the lower end of the drive shaft (8) is connected to the flexible rope (9). On the other side, the upper part of the lower support (1) and the lower end of the upper support (2) are respectively provided with a guide pin (20) and a connecting pin (19). The other end of the flexible rope (9) passes around the guide pin (20) and connects to the connecting pin (19). Rotation is transmitted to the drive shaft (8) via a bevel gear, realizing the lifting and lowering of the desktop (3). The main and driven legs are connected by the flexible rope (9), realizing the synchronous movement of the main and driven legs. This solves the problems of complex structure and high manufacturing cost of existing synchronous height-adjustable tables.

Description

Technical Field

[0001] This invention relates to a synchronously height-adjustable table, belonging to the field of daily necessities. Background Technology

[0002] Children use desks of different heights at different ages as they grow up, which requires desks to be height-adjustable. In addition, people often work in front of computers for several hours at a time, and prolonged sitting can be harmful to the body. For the sake of health, people need to switch between standing and sitting postures when using computers, which requires the height of the office desk to be easily adjustable. Traditional office desks and study desks do not have height adjustment functions.

[0003] Currently, the main height adjustment methods for manually adjustable height desks include linkage structure adjustment, gear and rack adjustment, worm gear and screw drive combination adjustment, and bevel gear and screw drive combination adjustment. Among these, the linkage structure adjustment only has two or three states, failing to achieve stepless height adjustment and thus failing to meet the needs of different users. The other adjustment methods in current market generally involve each leg being equipped with an identical lifting device to achieve synchronous height adjustment. For example, Chinese patent CN215532428U discloses a height-adjustable desk that uses a drive box to drive a transmission shaft to rotate, which in turn drives the bevel gears of each leg to rotate, thereby driving the screw mechanism of each leg to achieve height adjustment. Chinese patent CN215685550U discloses a multi-leg synchronous height-adjustable desk that uses a DC motor to transmit rotation to a pair of bevel gears, which in turn transmit to a transmission rod, which drives the height adjustment mechanism of each leg to achieve synchronous height adjustment. The structures used in these drive methods are relatively complex, resulting in high manufacturing and maintenance costs. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing synchronous lifting tables have complex structures, high manufacturing costs, and high maintenance costs.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: a synchronous lifting table, including legs and a desktop, the legs having an inverted T-shaped structure and being spaced apart at the lower end of the desktop, and also including a drive shaft, a soft rope, and a rotation drive device. The legs include an upper support and a lower support, with the lower support inserted into and slidably connected to the upper support. The upper end of the upper support is connected to the lower end of the desktop. The drive shaft is located in one side of the lower support, and the upper part of the drive shaft is threadedly connected to the lower support. The rotation drive device drives the drive shaft to rotate, and the upper end of the drive shaft extends into the upper support and contacts the lower end of the desktop. The lower end of the drive shaft is connected to one end of the soft rope. A guide pin is provided on the upper part of the lower support on the other side, and a connecting pin is provided on the lower end of the upper support on the other side. The other end of the soft rope passes through the lower end of the lower support on the other side, goes around the guide pin, and is connected to the connecting pin.

[0006] The aforementioned rotating drive device includes a bevel gear box, a bevel gear driven shaft, and a bevel gear drive shaft. The bevel gear box is located in the middle of the lower support with the transmission shaft. The bevel gear driven shaft and the bevel gear drive shaft are rotatably mounted inside the bevel gear box, and one end of the bevel gear driven shaft and the bevel gear drive shaft is provided with a meshing bevel gear. The bevel gear driven shaft is arranged along the length of the support leg. The transmission shaft is slidably connected to the bevel gear driven shaft and rotates together with the bevel gear driven shaft.

[0007] Furthermore, the bevel gear driven shaft in the above-mentioned device is provided with a connecting hole in the axial direction, and the transmission shaft passes through the connecting hole, so that the transmission shaft is slidably connected to the bevel gear driven shaft and rotates together with the bevel gear driven shaft.

[0008] Furthermore, the connecting hole in the above device is a polygonal hole structure, and the lower part of the drive shaft is an adaptable structure, with the lower part of the drive shaft passing through the connecting hole in the middle of the bevel gear driven shaft.

[0009] Furthermore, the conical gear box in the above-mentioned device includes a detachably connected conical gear box cover and a conical gear box base.

[0010] Furthermore, in the above-mentioned device, the end of the bevel gear drive shaft extends out of the bevel gear box and is provided with a drive unit.

[0011] In the aforementioned device, the transmission shaft is provided with an external thread in the middle, and the upper end of the lower bracket located on the same side of the transmission shaft is provided with a matching internal thread. The transmission shaft passes through the lower bracket and is threadedly connected to the lower bracket.

[0012] In the aforementioned device, the upper end of the drive shaft is connected to the desktop plate via a thrust ball bearing.

[0013] In the aforementioned device, the legs are connected by a connecting pipe, and pins are provided at both ends of the connecting pipe, so that the soft rope, away from the drive shaft end, passes around the pin and guide pin and then connects to the connecting pin.

[0014] In the aforementioned device, the connecting pin is disposed on the inner wall of the upper bracket, and the side wall of the lower bracket is provided with a strip-shaped hole arranged along the axial direction, with the end of the connecting pin passing through the strip-shaped hole.

[0015] The beneficial effects of this invention are: the device has a simple structure and is convenient and efficient to operate. The input rotational motion is achieved by the extended end of the rotating bevel gear drive shaft, which transmits the rotational motion to the drive shaft via bevel gear transmission. The spiral motion of the drive shaft then achieves the lifting and lowering of the desktop, and the self-locking function of the spiral transmission prevents the upper support from automatically descending. This transmission method is convenient, smooth, and the height is controllable. Simultaneously, the transmission structures of the main and driven legs are connected by a soft rope, and the synchronous movement of the main and driven legs is achieved using the lifting transmission device and the weight of the desktop, resulting in the overall smooth lifting and lowering of the desktop. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a partial cross-sectional view of the left side of the present invention.

[0018] Figure 3 For the present invention Figure 2 BB section view.

[0019] Figure 4 For the present invention Figure 2 Enlarged view of the structure at point C.

[0020] Figure 5 For the present invention Figure 1 The main view.

[0021] Figure 6 For the present invention Figure 5 Structure diagram before sectioning along line A.

[0022] Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the connection structure between the upper and lower supports on the other side.

[0023] The markings in the diagram are as follows: 1 is the lower support, 2 is the upper support, 3 is the desktop, 4 is the connecting pipe, 5 is the bevel gear box cover, 6 is the bevel gear box seat, 7 is the bevel gear driven shaft, 8 is the drive shaft, 9 is the soft rope, 10 is the radial ball bearing A, 11 is the radial ball bearing B, 12 is the thrust ball bearing, 13 is the bevel gear drive shaft, 14 is the angular contact ball bearing A, 15 is the angular contact ball bearing B, 16 is the end cover, 17 is the adjusting sleeve, 18 is the retaining ring, 19 is the connecting pin, and 20 is the guide pin. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figures 1 to 7As shown, the synchronous lifting table of the present invention includes legs and a desktop 3. The legs are inverted T-shaped and spaced apart at the lower end of the desktop 3. It also includes a drive shaft 8, a soft rope 9, and a rotation drive device. The legs include an upper support 2 and a lower support 1, with the lower support 1 inserted into and slidably connected to the upper support 2. The upper end of the upper support 2 is connected to the lower end of the desktop 3. The drive shaft 8 is disposed in one side of the lower support 1, and the upper part of the drive shaft 8 is threadedly connected to the lower support 1. The rotation drive device drives the drive shaft 8 to rotate. The upper end of the drive shaft 8 extends into the upper support 2 and contacts the lower end of the desktop 3. The lower end of the drive shaft 8 is connected to one end of the soft rope 9. A guide pin 20 is provided on the upper part of the lower support 1 on the other side, and a connecting pin 19 is provided on the lower end of the upper support 2 on the other side. The other end of the soft rope 9 passes through the lower end of the lower support 1 on the other side, goes around the guide pin 20, and is connected to the connecting pin 19. Those skilled in the art will understand that in this structure, the drive shaft 8 is housed inside the lower support 1 on one side. Therefore, it is preferable that both the upper support 2 and the lower support 1 are tubular structures, with the lower support 1 inserted into and slidably connected to the upper support 2. The upper end of the upper support 2 is connected to the lower end of the desktop 3, and the upper end of the drive shaft 8 extends into the upper support 2 and contacts the lower end of the desktop 3. Since the rotation drive device drives the drive shaft 8 to rotate, and the upper part of the drive shaft 8 is threadedly connected to the lower support 1, the drive shaft 8 actually moves in a spiral motion, thus directly acting on the desktop 3 to achieve its lifting and lowering. At the same time, the lower end of the drive shaft 8 is connected to one end of the soft rope 9, and the other end of the soft rope 9 passes through the lower end of the lower support 1 on the other side, passes around the guide pin 20, and is connected to the connecting pin 19. This allows the soft rope 9 to be pulled when the drive shaft 8 rises in a spiral motion, thereby causing the upper support 2 on the side away from the drive shaft 8 to rise synchronously, and vice versa.

[0026] Preferably, the rotation drive device in the above-mentioned device includes a bevel gear box, a bevel gear driven shaft 7, and a bevel gear drive shaft 13. The bevel gear box is disposed in the middle of the lower support 1 on which the transmission shaft 8 is provided. The bevel gear driven shaft 7 and the bevel gear drive shaft 13 are rotatably disposed in the bevel gear box, and one end of the bevel gear driven shaft 7 and the bevel gear drive shaft 13 is provided with a meshing bevel gear. The bevel gear driven shaft 7 is arranged along the length direction of the support leg. The transmission shaft 8 is slidably connected to the bevel gear driven shaft 7 and rotates together with the bevel gear driven shaft 7. Those skilled in the art will understand that, in order to facilitate the movement of the drive shaft 8, the preferred rotational drive device of this device includes a bevel gear box, a bevel gear driven shaft 7, and a bevel gear drive shaft 13. The bevel gear box is set in the middle of the lower bracket 1 on which the drive shaft 8 is located. The bevel gear driven shaft 7 and the bevel gear drive shaft 13 are rotatably set in the bevel gear box. Specifically, the bevel gear driven shaft 7 is vertically set in the bevel gear box through radial ball bearings A10 and B11, while the bevel gear drive shaft 13 is horizontally set in the bevel gear box through angular contact ball bearings A14 and B15. The outer side of the angular contact ball bearing B is limited by a retaining ring 18, and the outer rings of the angular contact ball bearings A14 and B15 are in contact with the adjusting sleeve 17 extending into the conical shape to avoid wear on the bevel gear box. At the same time, the outer side is fixed by the end cover 16. In fact, the end of the bevel gear drive shaft 13 extends out of the end cover 16, which is the rear drive part. Furthermore, bevel gear driven shaft 7 and bevel gear drive shaft 13 are provided with meshing bevel gears at one end. In fact, rotating bevel gear drive shaft 13 can drive bevel gear driven shaft 7 to rotate. In fact, bevel gear driven shaft 7 is arranged along the length of the support leg. Drive shaft 8 is slidably connected to bevel gear driven shaft 7 and rotates together with bevel gear driven shaft 7, so that bevel gear driven shaft 7 drives drive shaft 8 to rotate. Since the middle part of drive shaft 8 is threadedly connected to lower support 1, drive shaft 8 eventually moves in a threaded manner.

[0027] Preferably, in the above-described device, the bevel gear driven shaft 7 is axially provided with a connecting hole, and the transmission shaft 8 passes through the connecting hole, so that the transmission shaft 8 is slidably connected to the bevel gear driven shaft 7 and rotates together with the bevel gear driven shaft 7. Those skilled in the art will understand that this structure is only preferably provided with a connecting hole axially on the bevel gear driven shaft 7, and the transmission shaft 8 passes through the connecting hole. Due to the arrangement of the connecting hole and the transmission shaft 8, the transmission shaft 8 is slidably connected to the bevel gear driven shaft 7, that is, the transmission shaft 8 can slide along the axial direction of the bevel gear driven shaft 7, and the transmission shaft 8 also rotates together with the bevel gear driven shaft 7.

[0028] Preferably, the connecting hole in the above-mentioned device is a polygonal hole structure, and the lower part of the drive shaft 8 has a matching structure, with the lower part of the drive shaft 8 passing through the connecting hole in the middle of the bevel gear driven shaft 7. Those skilled in the art will understand that, in order to facilitate the connection between the drive shaft 8 and the bevel gear driven shaft 7, the device preferably has a connecting hole axially provided on the bevel gear driven shaft 7, preferably a square hole, while the lower part of the drive shaft 8 has a square tube structure. By passing the drive shaft 8 through the connecting hole, the drive shaft 8 and the bevel gear driven shaft 7 can rotate together. Because the drive shaft 8 and the bevel gear driven shaft 7 have a clearance fit, the drive shaft 8 can slide along the axial direction of the bevel gear driven shaft 7.

[0029] Preferably, the conical gear box in the above-described device includes a detachably connected conical gear box cover 5 and a conical gear box seat 6. Those skilled in the art will understand that this device preferably includes a detachably connected conical gear box cover 5 and a conical gear box seat 6. In practice, the outer wall of the conical gear box cover 5 is connected to the upper section of the lower support 1, while the conical gear box seat 6 is connected to the lower section of the lower support 1. This detachable design of the conical gear box facilitates the installation of its internal components.

[0030] Preferably, in the above-described device, the end of the bevel gear drive shaft 13 extends out of the bevel gear box and is provided with a drive unit. Those skilled in the art will understand that, to facilitate the rotation of the bevel gear drive shaft 13, this device preferably has the end of the bevel gear drive shaft 13 extending out of the bevel gear box and provided with a drive unit. This arrangement allows the bevel gear drive shaft 13 to rotate simply by rotating the drive unit. In practice, the drive unit can preferably be an external hexagonal or internal hexagonal structure.

[0031] Preferably, in the above-mentioned device, the drive shaft 8 has an external thread in its middle, and the upper end of the lower bracket 1 located on the same side as the drive shaft 8 has a matching internal thread. The drive shaft 8 passes through the lower bracket 1 and is threadedly connected to the lower bracket 1. Those skilled in the art will understand that the threaded connection structure between the drive shaft 8 and the lower bracket 1 is further preferably configured such that the drive shaft 8 has an external thread in its middle, and the upper end of the lower bracket 1 located on the same side as the drive shaft 8 has a matching internal thread. The drive shaft 8 passes through the lower bracket 1 and is threadedly connected to the lower bracket 1.

[0032] Preferably, in the above-described device, the upper end of the drive shaft 8 is connected to the desktop plate 3 via a thrust ball bearing 12. Those skilled in the art will understand that, since the drive shaft 8 spirals upwards, to avoid dry friction between the drive shaft 8 and the desktop plate 3, this device preferably connects the upper end of the drive shaft 8 to the desktop plate 3 via a thrust ball bearing 12.

[0033] Preferably, the legs in the above-mentioned device are connected by a connecting pipe 4, and pins are provided at both ends of the connecting pipe 4, so that the end of the soft rope 9 away from the drive shaft 8 passes around the pin and guide pin 20 and then connects to the connecting pin 19. Those skilled in the art will understand that, in order to ensure a firm connection of the legs, this device preferably connects the two legs into one unit via the connecting pipe 4, that is, the two lower supports 1 are connected into one unit. At the same time, pins are provided at both ends of the connecting pipe 4, so that the end of the soft rope 9 away from the drive shaft 8 passes around the pin and guide pin 20 and then connects to the connecting pin 19, ensuring smooth operation of the soft rope 9.

[0034] Preferably, in the above-described device, the connecting pin 19 is disposed on the inner wall of the upper bracket 2, and the side wall of the lower bracket 1 is provided with an axially arranged strip hole, with the end of the connecting pin 19 passing through the strip hole. Those skilled in the art will understand that, in order to ensure the vertical movement of the upper bracket 2 on the side away from the drive shaft 8, this device preferably disposes of the connecting pin 19 on the inner wall of the upper bracket 2, while the side wall of the lower bracket 1 is provided with an axially arranged strip hole, with the end of the connecting pin 19 passing through the strip hole. The strip hole design allows the connecting pin 19 to move vertically up and down, facilitating the vertical movement of the desktop 3.

Claims

1. A synchronously height-adjustable table, comprising legs and a desktop (3), wherein the legs are of an inverted T-shape and are spaced apart at the lower end of the desktop (3), characterized in that: It also includes a drive shaft (8), a soft rope (9), and a rotation drive device. The support leg includes an upper bracket (2) and a lower bracket (1), with the lower bracket (1) inserted into the upper bracket (2) and slidably connected thereto. The upper end of the upper bracket (2) is connected to the lower end of the desktop (3). The drive shaft (8) is located inside one side of the lower bracket (1), and the upper part of the drive shaft (8) is threadedly connected to the lower bracket (1). The rotation drive device drives the drive shaft (8) to rotate. The upper end of the drive shaft (8) extends into the upper bracket (2) and contacts the lower end of the desktop (3). The lower end of the drive shaft (8) is connected to one end of the soft rope (9). The upper part of the lower bracket (1) on the other side is provided with A guide pin (20) is provided, and a connecting pin (19) is provided at the lower end of the upper bracket (2) on the other side. The other end of the soft rope (9) passes through the lower end of the lower bracket (1) on the other side and passes around the guide pin (20) before connecting to the connecting pin (19). The legs are connected by a connecting pipe (4), and the two ends of the connecting pipe (4) are provided with pins, so that the end of the soft rope (9) away from the drive shaft (8) passes around the pin and the guide pin (20) before connecting to the connecting pin (19). The connecting pin (19) is provided on the inner wall of the upper bracket (2), and a strip hole arranged along the axial direction is provided on the side wall of the lower bracket (1), and the end of the connecting pin (19) passes into the strip hole.

2. The synchronous lifting table according to claim 1, characterized in that: The rotation drive device includes a bevel gear box, a bevel gear driven shaft (7) and a bevel gear drive shaft (13). The bevel gear box is located in the middle of the lower support (1) on which the transmission shaft (8) is located. The bevel gear driven shaft (7) and the bevel gear drive shaft (13) are rotatably located in the bevel gear box. One end of the bevel gear driven shaft (7) and the bevel gear drive shaft (13) is provided with a meshing bevel gear. The bevel gear driven shaft (7) is arranged along the length of the support leg. The transmission shaft (8) is slidably connected to the bevel gear driven shaft (7) and rotates together with the bevel gear driven shaft (7).

3. The synchronous lifting table according to claim 2, characterized in that: The bevel gear driven shaft (7) is provided with a connecting hole in the axial direction, and the transmission shaft (8) passes through the connecting hole, so that the transmission shaft (8) is slidably connected to the bevel gear driven shaft (7) and rotates together with the bevel gear driven shaft (7).

4. The synchronous lifting table according to claim 3, characterized in that: The connecting hole is a polygonal hole structure, and the lower part of the drive shaft (8) is a matching structure. The lower part of the drive shaft (8) passes into the connecting hole in the middle of the bevel gear driven shaft (7).

5. The synchronous lifting table according to claim 2, characterized in that: The bevel gear box includes a detachably connected bevel gear box cover (5) and a bevel gear box base (6).

6. The synchronous lifting table according to claim 2, characterized in that: The end of the bevel gear drive shaft (13) extends out of the bevel gear box and is provided with a drive unit.

7. The synchronous lifting table according to claim 1, characterized in that: The transmission shaft (8) has an external thread in the middle, and the upper end of the lower bracket (1) located on the same side as the transmission shaft (8) has a matching internal thread. The transmission shaft (8) passes through the lower bracket (1) and is threadedly connected to the lower bracket (1).

8. The synchronous height-adjustable table according to claim 1, characterized in that: The upper end of the drive shaft (8) is connected to the desktop plate (3) via a thrust ball bearing (12).

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