One-way brake assembly

Abstract

This utility model discloses a one-way braking assembly, including a rotating component and a floating seat. The rotating component and the floating seat are in frictional engagement, and a braking component is provided on the floating seat, which acts on the floating seat. When the rotating component rotates, the floating seat tends to rotate in the same direction due to frictional engagement, and the braking component releases or locks the floating seat according to its tendency direction. The rotating component and the floating seat squeeze each other, and the pressure changes with the external load. When locked, the frictional force of the floating seat on the rotating component changes adaptively with the load, ensuring effective braking under heavy loads. Moreover, the motor drive loss decreases as the load decreases, saving energy, extending lifespan, and eliminating braking noise during descent. The structural design adapts to the needs of load changes.

Description

Technical Field

[0001] This utility model relates to the field of height-adjustable furniture, and in particular to a one-way braking component. Background Technology

[0002] In existing height-adjustable furniture, such as height-adjustable desks, a self-locking device is required to maintain the height after the adjustment when the motor is not working. The most common and cost-effective device is a one-way self-locking device using a torsion spring. This device achieves one-way braking and self-locking by the different deformation of the torsion spring due to different directions of force. When the torsion spring is subjected to different directions of force, it can expand or contract, and work with the friction seat set inside or outside the torsion spring to achieve one-way self-locking.

[0003] When the torsion spring is sleeved outside the friction seat, when the motor drives the lead screw to rotate in the forward direction to increase the height, the torsion spring expands and releases the friction seat; when the motor is not working, the torsion spring contracts and hugs the friction seat to lock it, preventing the lead screw from rotating and maintaining the height unchanged; when the motor drives the lead screw to rotate in the reverse direction to decrease the height, the torsion spring still locks the friction seat, but the motor power can overcome it, causing the torsion spring and the friction seat to rotate relative to each other.

[0004] Since lifting furniture such as height-adjustable desks and beds inevitably requires placing items on them during use, this increases the overall weight and thus the axial load. Therefore, the braking force between the torsion spring and the friction seat needs to be sufficiently large to accommodate the larger load. Consequently, when lowering the height, the motor needs to overcome significant resistance, resulting in higher power consumption and a shorter motor lifespan. Furthermore, the forced rotation of both the torsion spring and the friction seat while they are gripping each other generates noise and also shortens their lifespan. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a one-way braking assembly, comprising a rotating component and a floating seat. The rotating component and the floating seat are in frictional engagement, and a braking component is provided on the floating seat, acting on the floating seat. When the rotating component rotates, the floating seat tends to rotate in the same direction due to the frictional engagement, and the braking component releases or locks the floating seat according to its tendency direction. The rotating component and the floating seat press against each other, and the pressure changes with the external load. When locked, the frictional force exerted by the floating seat on the rotating component adapts to the load, ensuring effective braking under heavy loads. Furthermore, the motor drive loss decreases as the load decreases, saving energy, extending lifespan, and eliminating braking noise during descent. The structural design is adapted to the needs of load changes.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A one-way braking assembly includes a rotating member and a floating seat. The rotating member and the floating seat are in frictional engagement. A braking member is provided on the floating seat and acts on the floating seat. The rotating member rotates about its axis and has two opposite rotation directions. When the rotating member has a rotation tendency, the floating seat has a rotation tendency in the same direction as the rotating member through frictional engagement. The braking member is configured to release or lock the floating seat according to the different directions of the rotation tendency of the floating seat. The rotating member and the floating seat are arranged to press against each other.

[0008] In this solution, braking is controlled by a braking component. The braking component acts on the floating seat, which in turn acts on the rotating component. The movement of the rotating component affects the height of the lifting furniture. When the floating seat is braked, the rotating component is also braked by the floating seat. Although braking is achieved through friction, the pressure between the floating seat and the rotating component changes with the external load. Therefore, under heavy loads, the friction generated by the two is sufficient to achieve braking between the floating seat and the rotating component. Moreover, since the friction can adapt to the load, the losses generated by the motor driving the rotating component to rotate under braking conditions also adapt to the load. The losses are smaller under smaller loads, which not only saves energy but also extends the service life of the motor and eliminates the noise generated by braking during descent.

[0009] Preferably, the floating seat and the brake component are arranged coaxially and nested together; the pressure between the rotating component and the floating seat changes in response to changes in the external load; when the brake component locks the floating seat, the frictional force exerted by the floating seat on the rotating component changes in response to changes in the external load. Regardless of whether the brake component is a one-way bearing or a torsion spring, and regardless of whether the brake component is located on the outside or inside of the floating seat, the floating seat and the brake component must be arranged coaxially and nested together.

[0010] Preferably, both the floating seat and the rotating component have conical surfaces, with the contact surface between them being a conical surface, and the rotating component being inserted into the floating seat. The conical surface not only increases the contact area but also, due to the slope, generates a more pronounced frictional effect when compressed.

[0011] Preferably, there are at least two rotating parts, and the rotating parts are located at at least the upper and lower ends of the floating seat. The two rotating parts located at the upper and lower ends of the floating seat press against the floating seat from the upper and lower directions respectively. The floating seat is sleeve-shaped, and the two rotating parts are respectively inserted into the upper and lower ends of the floating seat. Increasing the number of rotating parts can increase the contact area between the rotating parts and the floating seat, thereby increasing the friction effect.

[0012] Preferably, the brake component is a torsion spring or a one-way bearing.

[0013] Preferably, the system also includes a stationary seat, a rotating component that is rotatably mounted relative to the stationary seat, and a brake component mounted on the stationary seat. The rotating component and the stationary seat work together to press the floating seat against the rotating component. The rotating component or the stationary seat changes the pressure between the floating seat and the rotating component in response to an external load.

[0014] The stationary seat is a component that remains stationary relative to the rotating component. In the lifting column, the first pipe, motor box, and bearing plate can all be stationary seats. In addition to being able to rotate relative to the stationary seat, the rotating component also has frictional engagement with the floating seat. In the lifting column, the rotating component can be a lead screw, but at the same time, a part for frictional engagement with the floating seat needs to be integrally formed on the lead screw. The rotating component can also be a friction component. The friction component can both rotate like the stationary seat and have frictional engagement with the floating seat, but the friction component needs to be set on the lead screw so that it rotates with the rotation of the lead screw.

[0015] Regarding the interaction between the rotating component and the stationary seat on the floating seat, causing them to press against each other, the stationary seat can act directly or indirectly on the floating seat, but generally indirectly; the rotating component generally acts directly on the floating seat, but can also act indirectly on it.

[0016] Preferably, there are at least two rotating parts, and the rotating parts are located at at least the upper and lower ends of the floating seat, with the stationary seat abutting against the rotating parts.

[0017] Preferably, the brake component has two operating ends, one of which is connected to the stationary seat and the other acts on the floating seat. One operating end of the brake component is connected to the stationary seat to ensure that the brake component can brake the floating seat while it is stationary, while the other operating end switches between braking and non-braking states depending on the rotation direction of the floating seat.

[0018] Preferably, the brake component is a torsion spring, which is sleeved on the floating seat. The torsion spring includes an outwardly extending support arm. The stationary seat has a retaining seat with a retaining groove, and the support arm is inserted into the retaining groove.

[0019] Preferably, the brake component is a one-way bearing, with the outer ring of the one-way bearing tightly fitted to the stationary seat and the inner ring of the one-way bearing tightly fitted to the floating seat.

[0020] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0021] In this solution, braking is controlled by a braking component. The braking component acts on the floating seat, which in turn acts on the rotating component. The movement of the rotating component affects the height of the lifting furniture. When the floating seat is braked, the rotating component is also braked by the floating seat. Although braking is achieved through friction, the pressure between the floating seat and the rotating component changes with the external load. Therefore, under heavy loads, the friction generated by the two is sufficient to achieve braking between the floating seat and the rotating component. Moreover, since the friction can adapt to the load, the losses generated by the motor driving the rotating component to rotate under braking conditions also adapt to the load. The losses are smaller under smaller loads, which not only saves energy but also extends the service life of the motor and eliminates the noise generated by braking during descent. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the lifting column in Embodiment 1 of this utility model;

[0023] Figure 2 This is a cross-sectional view of the lifting column in Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram showing the location of the brake component in Embodiment 1 of this utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the brake component placement location in Embodiment 1 of the present invention;

[0026] Figure 5 This is an exploded view of the mounting components, floating seat, friction element, lead screw, gasket, and brake element in Embodiment 1 of this utility model;

[0027] Figure 6 This is an exploded view of the rotating component, stationary seat, and floating seat in Embodiment 1 of this utility model;

[0028] Figure 7 This is a cross-sectional view of the gasket, friction element, and floating seat in Embodiment 1 of this utility model;

[0029] Figure 8 This is a cross-sectional view of the lifting column in Embodiment 1 of this utility model when there is only one pad;

[0030] Figure 9 This is a three-dimensional structural diagram of the one-way braking assembly in Embodiment 1 of this utility model. Figure 1 ;

[0031] Figure 10 This is a three-dimensional structural diagram of the one-way braking assembly in Embodiment 1 of this utility model. Figure 2 ;

[0032] Figure 11This is an exploded view of the one-way braking assembly in Embodiment 1 of this utility model;

[0033] Figure 12 This is an exploded view of the friction between the friction component and the floating seat plane in Embodiment 2 of this utility model;

[0034] Figure 13 This is a cross-sectional schematic diagram of the friction between the friction component and the floating seat plane in Embodiment 2 of this utility model;

[0035] Figure 14 This is a three-dimensional structural diagram of the friction component and the lead screw integrally formed as a rotating component in Embodiment 3 of this utility model.

[0036] The attached figures are labeled as follows: motor box 1; first pipe fitting 2; telescopic component 3; motor 4; lead screw 5; threaded part 51; step 511; shaft end 52; mounting assembly 6; rotating bearing 61; bearing plate 62; card seat 621; card groove 622; friction component 7; floating seat 8; brake component 9; support arm 91; nut fitting 10; gasket 11; compensation spring 12. Detailed Implementation

[0037] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] The specific embodiments of this utility model are as follows: Example

[0041] like Figure 1 , 2As shown in Figures 5, 6, and 9-11, this utility model provides a one-way braking assembly, including a rotating component and a stationary seat. The rotating component is rotatably disposed relative to the stationary seat. A floating seat 8 is provided on the rotating component, and a brake component 9 is provided on the stationary seat. The brake component 9 acts on the floating seat 8. The rotating component and the floating seat 8 are in frictional engagement. The rotating component rotates around its axis and has two opposite rotational directions. When the rotating component has a rotational tendency, the floating seat 8, through frictional engagement, has a rotational tendency in the same direction as the rotating component. The brake component 9 is configured to release or lock the floating seat 8 according to the different directions of the rotational tendency of the floating seat 8. The rotating component and the stationary seat work together to press the floating seat 8 against the rotating component. The rotating component or the stationary seat changes the pressure between the floating seat 8 and the rotating component in response to external load. When the brake component 9 locks the floating seat 8, the frictional force exerted by the floating seat 8 on the rotating component changes in response to changes in external load.

[0042] The brake component 9 always has two working ends, one of which is connected to the stationary seat and the other is applied to the floating seat 8.

[0043] The one-way braking assembly is applied to a lifting column, which includes a telescopic sleeve and a motor box 1. The telescopic sleeve includes a first pipe 2 connected to the motor box 1 and at least one telescopic component 3 sleeved with the first pipe 2. The motor box 1 is equipped with a motor 4, and the telescopic sleeve is equipped with a push rod assembly. The push rod assembly includes a lead screw 5, which has a threaded portion 51 and a shaft end 52 located in the first pipe 2 and extending into the motor box 1. The shaft end 52 is connected to the motor 4 for transmission. The motor box 1 is also fixedly equipped with a mounting assembly 6, and the lead screw 5 is rotatably arranged relative to the mounting assembly 6.

[0044] The shaft end 52 between the mounting assembly 6 and the threaded part 51 is provided with a friction element 7 that rotates synchronously with the lead screw 5 and a floating seat 8 that is floating and abuts against the friction element 7. The floating seat 8 is provided with a brake element 9, which is configured to act on the floating seat 8 and has a release state and a braking state according to different movement trends of the telescopic sleeve. The mounting assembly 6 and the threaded part 51 are configured to apply pressure to the friction element 7 and the floating seat 8 to bring them closer together, and the magnitude of this pressure changes in response to changes in axial load. The floating seat 8 and the brake element 9 are arranged coaxially and are sleeved together.

[0045] When the telescopic sleeve has an elongation tendency, the brake 9 is in the released state, and the floating seat 8 rotates together with the friction component 7 and the lead screw 5.

[0046] When the telescopic sleeve tends to shorten, the brake element 9 is in a braking state, the brake element 9 grips the floating seat 8, and the floating seat 8 applies a braking force to the friction element 7 to prevent the lead screw 5 from rotating; the braking force changes in response to the change in pressure.

[0047] The stationary seat is a component that remains stationary relative to the rotating component. In the lifting column, the first pipe 2, the motor box 1, and the bearing plate 62 can all be stationary seats. In addition to being able to rotate relative to the stationary seat, the rotating component also engages with the floating seat 8 through friction. In the lifting column, the rotating component can be a lead screw, but a part for friction engagement with the floating seat 8 needs to be integrally formed on the lead screw 5. The rotating component can also be a friction component 7, which can both rotate relative to the stationary seat and engage with the floating seat 8 through friction. However, the friction component 7 needs to be mounted on the lead screw 5 so that it rotates with the rotation of the lead screw 5. In this embodiment, the stationary seat is the bearing plate 62, and the rotating component is the friction component 7.

[0048] The lifting column is used in a height-adjustable desk, which includes a tabletop (not shown) and at least one lifting column as described above. The motor box 1 or telescopic component 3 is connected to the tabletop and is subjected to axial load by the tabletop. The lifting column is configured to extend and retract to control the height of the tabletop. When the lifting column extends, the brake component 9 is released, and the power of the motor 4 overcomes the axial load to raise the height of the tabletop. When the lifting column remains at a constant length, the brake component 9 is in a braking state, and the braking force locks the screw 5 to keep the height of the tabletop constant. When the lifting column shortens, the brake component 9 is in a braking state, and the power of the motor 4 overcomes the braking force to lower the height of the tabletop. When the axial load applied by the tabletop changes, the pressure between the friction component 7 and the floating seat 8 changes accordingly, and the braking force overcome by the motor 4 also changes adaptively.

[0049] The first pipe fitting 2 can be either the innermost inner pipe or the outermost outer pipe in a telescopic sleeve. That is, it can be either the inner pipe or the outer pipe connected to the motor box 1. The telescopic component 3 can be a single pipe fitting, i.e., the second pipe fitting that is sleeved with the first pipe fitting 2. Alternatively, the telescopic component 3 can be a set of sleeves. In other words, the lifting column can be a two-section column with only an inner and outer pipe, or it can be a column with three or more sections. In this embodiment, the first pipe fitting 2 is the inner pipe and is connected to the motor box 1, and the telescopic component 3 is the second pipe fitting, sleeved outside the first pipe fitting 2.

[0050] The first tube 2 is hollow, and the motor box 1 has a mounting hole on the end face near the first tube 2, so that the shaft end 52 can enter the motor box 1 and the mounting assembly 6 can be installed therein.

[0051] The mounting assembly 6 has a rotating bearing 61, and the shaft end 52 of the lead screw 5 is located in the rotating bearing 61. The mounting assembly 6, the motor box 1, and the first tube 2 can be regarded as a whole. The lead screw 5 rotates relative to the mounting assembly 6, the motor box 1, and the first tube 2 through the rotating bearing 61. Similarly, the telescopic component 3, the lead screw 5, and the lead screw nut tube 10 outside the lead screw 5 are a whole. When the lifting column is installed, the whole formed by the mounting assembly 6, the motor box 1, and the first tube 2 provides axial load. The whole formed by the telescopic component 3, the lead screw 5, and the lead screw nut tube 10 blocks the floating seat 8 or the friction component 7, thereby causing the floating seat 8 and the friction component 7 to be squeezed due to the axial load.

[0052] Specifically, there are two friction elements 7, located at the upper and lower ends of the floating seat 8. The floating seat 8 is sleeve-shaped, with the two friction elements 7 inserted into its upper and lower ends respectively. The mounting assembly 6 and the threaded portion 51 both abut against the friction elements 7. The two friction elements 7 at the upper and lower ends of the floating seat 8 press against it from both directions. Increasing the number of friction elements 7 increases the contact area between them and the floating seat 8, thereby increasing the friction effect. The shaft end 52 of the lead screw 5 is hexagonal, and the friction element 7 has a hexagonal hole. The shaft end 52 is inserted into the hexagonal hole to achieve synchronous rotation of both. Mounting assembly 6 includes a bearing plate 62 and the rotary bearing 61. The bearing plate 62 is mounted on the base plate of the motor housing 1, and the rotary bearing 61 is disposed in the bearing plate 62. The shaft end 52 of the lead screw 5 is inserted into the rotary bearing 61. The rotary bearing 61 abuts against the friction element 7 or the floating seat 8, and a gasket 11 is provided between the rotating bearing 61 and the abutting parts in the friction element 7 or the floating seat 8. In this embodiment, the inner ring of the rotary bearing 61 abuts against the friction element 7, and because of the gasket 11, the abutment is indirect. Of course, it can also abut directly without the gasket 11.

[0053] Regarding the fact that the rotating component and the stationary seat work together to cause the floating seat 8 to press against each other, the stationary seat can act directly or indirectly on the floating seat 8. In this embodiment, the two friction components 7, which are rotating components, directly press against the floating seat 8, while the friction components 7 are pressed by the bearing plate 62 and the lead screw 5. The bearing plate 62, which is the stationary seat, acts indirectly on the floating seat 8.

[0054] Brake component 9 can be either a torsion spring or a one-way bearing, both of which can achieve the effect of one-way braking. Brake component 9 can be set in the floating seat 8 or sleeved on the outside of the floating seat 8, as long as one end of brake component 9 always acts on the floating seat 8 and achieves one-way braking.

[0055] Specifically, when the brake component 9 is a one-way bearing, the outer ring of the one-way bearing is tightly fitted with the mounting assembly 6, and the inner ring of the one-way bearing is tightly fitted with the floating seat 8. The characteristic of a one-way bearing is that its inner and outer rings can rotate in one direction and lock in the other, thereby achieving one-way locking of the floating seat 8 and realizing a one-way braking effect. Of course, when the one-way bearing is located inside the floating seat 8, one-way braking can also be achieved. When the brake component 9 is a one-way bearing, its two working ends are the end face tightly fitted with the mounting assembly 6 and the end face tightly fitted with the floating seat 8, respectively. In this embodiment, as... Figure 3 , 4 As shown in Figures 9-11, the brake element 9 is a torsion spring, which is sleeved on the floating seat 8. The torsion spring includes an outwardly extending support arm 91. A retainer 621 extends downward on the bearing plate 62 of the mounting assembly 6. The retainer 621 has a retaining groove 622, and the support arm 91 is inserted into the retaining groove 622. In this embodiment, the bearing plate 62 is the stationary seat in the assembly. The brake element 9 is a torsion spring, and the support arm 91 is one of the working ends of the brake element 9, while the other working end is the contact surface between the torsion spring and the floating seat 8. When the floating seat 8 has a rotational tendency in different directions, it applies frictional force in different directions to the torsion spring, causing the torsion spring to expand or contract. When the torsion spring expands, it is in a released state, and the floating seat 8 is unlocked and can rotate together with the friction element 7. When the torsion spring contracts, it is in a braking state, and the floating seat 8 is locked, applying braking force to the friction element 7. Alternatively, it can be set inside the floating seat 8, locking the floating seat 8 when the torsion spring expands.

[0056] The different movement trends of the telescopic sleeve cause the floating seat 8 to exert different directions of frictional force on the brake component 9, resulting in different states of the brake component 9.

[0057] When the lifting column is in its upright position, the motor box 1 is at the upper end and connected to the table. The pressure between the friction element 7 and the floating seat 8 is actively applied by the mounting assembly 6, while the lead screw 5 passively applies pressure. Similarly, when the lifting column is in its reverse position, the motor box 1 is at the lower end, and the end of the telescopic element 3 is connected to the table. The aforementioned pressure is actively applied by the lead screw 5, while the mounting assembly 6 passively applies pressure. Whether the mounting assembly 6 or the lead screw 5 acts directly on the friction element 7 or the floating seat 8 does not affect the achieved effect. However, regardless of the situation, the circumferential limiting provided by the mounting assembly 6 and the lead screw 5 is indispensable when pressure is generated; that is, both active and passive pressure must be applied. In this embodiment, as... Figure 1 , 5As shown, the lifting column is mounted upright, the motor box 1 is connected to the table, and the axial load is transmitted downward by the mounting assembly 6. The rotating bearing 61 in the mounting assembly 6 will actively apply pressure to the friction element 7 above. The threaded part 51 has a step 511 near the shaft end 52. The step 511 abuts against the friction element 7 located below. The step 511 restricts the friction element 7 and passively applies pressure to the friction element 7, thereby creating compression between the two friction elements 7 and the floating seat 8. A gasket 11 is provided between the step 511 and the friction element 7. The function of the gasket 11 is to maintain stable contact and reduce wear. After being separated by the gasket 11, interference caused by direct contact can also be prevented.

[0058] like Figure 8 As shown, a gasket 11 can also be provided only between the friction element 7 and the step 511.

[0059] like Figure 3 , 6 As shown in Figure 7, both the floating seat 8 and the friction element 7 have conical surfaces. The contact surface between the floating seat 8 and the friction element 7 is a conical surface, and the friction element 7 is inserted into the floating seat 8. The conical surface not only increases the contact area, but also produces a more obvious friction effect when compressed due to the slope. The two friction elements 7 are inserted into the floating seat 8 from the top and bottom directions, respectively. The floating seat 8 is not connected to other components, so that pressure is generated between the floating seat 8 and the friction element 7 due to axial load.

[0060] like Figure 3 , 5 As shown, a compensating spring 12 is fitted on the shaft end 52 between the rotating bearing 61 of the mounting assembly 6 and the motor 4. The shaft end 52 is fixedly connected to the output end of the motor 4. The compensating spring 12 is configured to compensate for the gap between the friction element 7 and the floating seat 8 caused by wear. Long-term friction between the friction element 7 and the floating seat 8 will cause wear. The wear will cause the friction element 7 and the floating seat 8 to no longer be tightly pressed, and it will be unable to generate sufficient braking force, resulting in the failure of braking effect. The compensating spring 12 can compensate for the gap between the friction element 7 and the floating seat 8 after wear occurs, so that the friction element 7 and the floating seat 8 still maintain tight pressing, ensuring normal braking effect and extending service life. The compensating spring 12 is a wave spring, which provides axial elastic force without occupying much space. Moreover, the wear itself is small, and a large spring stroke is not required.

[0061] The braking force can prevent the lead screw 5 from rotating when the telescopic sleeve has a shortening tendency, thereby maintaining the current length of the lifting column, that is, maintaining the current height of the lifting table. The braking force changes in response to the change of the pressure, and the pressure changes in response to the change of the axial load, which means that the braking force can adapt to the change of the axial load.

[0062] Axial load is the load on the lifting column in the axial direction, generally the weight of the tabletop and the load on the table. The weight of the tabletop is generally constant, while the load on the tabletop is determined by the weight of the items placed on it. When the items on the tabletop are heavier and the load on the tabletop is greater, the braking force will increase adaptively to achieve a heavy-weight braking effect. When the items on the tabletop are lighter and the load on the tabletop is smaller, the braking force will decrease adaptively. This maintains a stable braking effect, and the power consumption of motor 4 due to overcoming the braking force when the tabletop descends will also decrease accordingly. This not only saves energy but also extends the service life of motor 4 and eliminates the noise generated by braking during descent.

[0063] The working method is as follows:

[0064] When rising, the lead screw 5 rotates in the forward direction, driving the friction element 7 to rotate in the forward direction. There is static friction between the friction element 7 and the floating seat 8. The floating seat 8 rotates together. The spring or one-way bearing set on the floating seat 8 does not act on the floating seat 8. The floating seat 8 rotates relative to the spring or one-way bearing, or the bearing plate 62, etc., without acting as a brake. The power consumption of the motor 4 is low. When the friction element 7 applies frictional force to the floating seat 8, the floating seat 8 also applies forward frictional force to the spring or one-way bearing. However, this forward frictional force will not cause the spring or one-way bearing to produce a braking effect.

[0065] Self-locking only applies to downtrends or downward directions:

[0066] When motor 4 stops and the tabletop tends to descend due to the load, lead screw 5 tends to rotate in the opposite direction, causing friction component 7 to also tend to rotate in the opposite direction. Static friction is generated between friction component 7 and floating seat 8, causing floating seat 8 to also tend to rotate in the opposite direction. Floating seat 8 further applies reverse friction force to spring or one-way bearing. At this time, spring or one-way bearing will brake floating seat 8, preventing floating seat 8 from rotating, thereby preventing friction component 7 and lead screw 5 from rotating, thus achieving braking.

[0067] During descent, the lead screw 5 rotates in the reverse direction, causing the friction element 7 to rotate in the reverse direction. When the friction element 7 applies a frictional force to the floating seat 8 to rotate in the reverse direction, the floating seat 8 tends to rotate in the reverse direction. The floating seat 8 further applies a reverse frictional force to the spring or one-way bearing. At this time, the spring or one-way bearing will brake the floating seat 8, preventing it from rotating. Moreover, since the frictional force between the floating seat 8 and the spring or one-way bearing is greater than the frictional force between the floating seat 8 and the friction element 7, the floating seat 8 and the spring or one-way bearing will never rotate relative to each other. Only the floating seat 8 and the friction element 7 will rotate relative to each other to achieve the descent of the lifting table.

[0068] The magnitude of the braking force is determined by the friction coefficient and pressure between the friction component 7 and the floating seat 8. The friction coefficient is determined by the material itself and is difficult to change, while the pressure is determined by the axial load on the table. The greater the axial load, the greater the pressure between the two, and the greater the friction force, i.e. the braking force, generated, thus achieving adaptive load braking.

[0069] Example 2: The only difference between this example and Example 1 is that the friction element 7 is disc-shaped, such as... Figure 12 , 13 As shown, there are two friction components 7, located on the upper and lower sides of the floating seat 8 respectively. The two friction components 7 abut against and rub against the upper and lower end faces of the floating seat.

[0070] Example 3: The only difference between this example and Example 1 is that the lead screw 5 is a rotating component, and the friction component 7 is integrally formed on the lead screw 5, such as... Figure 14 As shown, the friction component 7 is integrally formed on the lead screw 5, and is the part where the lead screw 5 and the floating seat 8 are in frictional contact. Since the friction generates material requirements, and the friction component 7 is formed on the lead screw 5, it is made of metal. Therefore, the floating seat should be made of plastic material with greater friction.

Claims

1. A one-way braking assembly, characterized in that: It includes a rotating component and a floating seat. The rotating component and the floating seat are in frictional engagement. The floating seat is equipped with a brake component, which acts on the floating seat. The rotating component rotates around its axis and has two opposite rotation directions. When the rotating component has a rotation tendency, the floating seat has a rotation tendency in the same direction as the rotating component through frictional engagement. The brake component is configured to release or lock the floating seat according to the different directions of the floating seat's rotation tendency. The rotating component and the floating seat are arranged to press against each other.

2. The one-way braking assembly according to claim 1, characterized in that: The floating seat and the brake are arranged coaxially and nested together; the pressure between the rotating part and the floating seat changes in response to changes in the external load; when the brake locks the floating seat, the frictional force exerted by the floating seat on the rotating part changes in response to changes in the external load.

3. The one-way braking assembly according to claim 1, characterized in that: Both the floating seat and the rotating component have conical surfaces. The contact surface between the floating seat and the rotating component is a conical surface, and the rotating component is inserted into the floating seat.

4. The one-way braking assembly according to claim 1, characterized in that: There are at least two rotating parts, and the rotating parts are located at the upper and lower ends of the floating seat. The two rotating parts located at the upper and lower ends of the floating seat press the floating seat from the upper and lower directions respectively. The floating seat is sleeve-shaped, and the two rotating parts are inserted into the upper and lower ends of the floating seat respectively.

5. The one-way braking assembly according to claim 1, characterized in that: The brake components are torsion springs or one-way bearings.

6. The one-way braking assembly according to claim 1, characterized in that: It also includes a stationary seat, a rotating component that is rotatably mounted relative to the stationary seat, a brake component mounted on the stationary seat, and the rotating component and the stationary seat working together to press the floating seat against each other. The rotating component or the stationary seat changes the pressure between the floating seat and the rotating component in response to external load.

7. The one-way braking assembly according to claim 6, characterized in that: There are at least two rotating parts, and the rotating parts are located at at least the upper and lower ends of the floating seat, with the stationary seat abutting against the rotating parts.

8. The one-way braking assembly according to claim 6, characterized in that: The brake component has two operating ends, one of which is connected to the stationary seat, and the other operating end acts on the floating seat.

9. The one-way braking assembly according to claim 6, characterized in that: The brake component is a torsion spring, which is sleeved on the floating seat. The torsion spring includes an outwardly extending support arm. The stationary seat has a retaining seat with a retaining groove, and the support arm is inserted into the retaining groove.

10. The one-way braking assembly according to claim 6, characterized in that: The brake component is a one-way bearing. The outer ring of the one-way bearing is tightly fitted to the stationary seat, and the inner ring of the one-way bearing is tightly fitted to the floating seat.

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