A lifting table hand crank with self-locking structure and a lifting table

Abstract

The present invention shows a hand crank for a lifting table with a self-locking structure, including a crank, a rotating shaft and a mounting seat, the hand crank is used to control the lifting of the lifting table, the crank is connected to the rotating shaft, the rotating shaft is passed through the mounting seat, a one-way bearing is provided on the rotating shaft, a torsion spring is sleeved on the one-way bearing, a rotation-stopping part is provided at the end of the torsion spring, the rotation-stopping part is fixed inside the mounting seat, when the rotation direction of the crank is opposite to the positive rotation direction of the one-way bearing, the one-way bearing generates a torsional force on the inner wall of the torsion spring to loosen the torsion spring; the present invention also shows a lifting table, which adopts the above-mentioned hand crank. The advantage of the present invention is that the hand crank has a self-locking structure, can achieve self-locking, and has a good self-locking effect.

Description

[Technical field]

[0001] The invention relates to a lifting table hand crank with a self-locking structure and a lifting table, belonging to the technical field of lifting table accessories. [Background technology]

[0002] The hand crank is a mechanical structure with a simple structure and a wide range of applications. Power is usually transmitted by shaking the hand crank, allowing the user to achieve the desired purpose with less effort.

[0003] At present, in addition to electric-driven lifting tables, there are also hand-cranked lifting tables. Compared with electric-driven ones, hand-cranked ones are more energy-saving and environmentally friendly, have lower costs, are easier to control the lifting height and speed, can be stopped at any time when encountering problems during the process, and are highly safe. However, the current hand-cranked lifting tables have the problem of poor self-locking performance. When controlling the rise of the desktop, there are generally no problems with the hand-cranked lifting tables. However, after the desktop rises to a suitable height, the weight of the desktop itself and the items placed on it will exert pressure on the column, causing the column to compress downward, which can easily cause the hand crank to rotate in the opposite direction, causing the desktop to drop. Therefore, it is difficult for the hand-cranked lifting table to remain at a suitable height, and its overall stability is poor, which can easily cause inconvenience to the user and may even cause injury to the user. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to provide a hand crank handle for a lifting table with a self-locking structure. The hand crank handle has a self-locking structure, can achieve self-locking, and has a good self-locking effect.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A hand crank for a lifting table with a self-locking structure comprises a crank handle, a rotating shaft and a mounting seat, the hand crank handle is used to control the lifting and lowering of the lifting table, the crank handle is connected to the rotating shaft, the rotating shaft is passed through the mounting seat, a one-way bearing is provided on the rotating shaft, a torsion spring is sleeved on the one-way bearing, a stopper is provided at the end of the torsion spring for limiting the rotation of the torsion spring in the mounting seat, the stopper is fixed inside the mounting seat, when the rotation direction of the crank handle is opposite to the positive rotation direction of the one-way bearing, the inner wall of the torsion spring is loosened under the action of the overall rotation of the one-way bearing.

[0007] The beneficial effects of adopting the present invention are:

[0008] In the present invention, a one-way bearing is provided on the rotating shaft, a torsion spring is sleeved on the one-way bearing, the torsion spring tightly holds the one-way bearing, and the torsion spring is fixed inside the mounting seat through a rotation-stopping portion. During use of the present invention, the user controls the lifting and lowering of the lifting table by rotating the crank. When the rotation direction of the crank is the same as the positive rotation direction of the one-way bearing, the crank controls the lifting table to rise normally, and stops when it rises to an appropriate height. In a stationary state, the desktop and objects on the desktop will generate pressure on the lifting column, so that the crank has a tendency to reverse. The reverse direction of the crank handle is opposite to the forward rotation direction of the one-way bearing, so the inner ring and outer ring of the one-way bearing cannot rotate relative to each other. In addition, the torsion spring itself cannot rotate in the mounting seat due to the limitation of the anti-rotation part, and the torsion spring holds the one-way bearing tightly, so the one-way bearing as a whole cannot rotate, thereby realizing self-locking of the hand crank. The present invention realizes self-locking through the action of the torsion spring on the one-way bearing, and has good locking effect. It is generally difficult for non-human external force to break through the locking of the torsion spring on the one-way bearing. Therefore, the present invention can improve the stability of the lifting table and allow users to use it with more confidence.

[0009] It should be noted that the one-way bearing includes an inner ring and an outer ring. The direction in which the inner ring and the outer ring can rotate relative to each other is the forward rotation direction of the one-way bearing, and the direction in which the inner ring and the outer ring cannot rotate relative to each other is the reverse rotation direction of the one-way bearing. When the rotation direction of the crank is the same as the forward rotation direction of the one-way bearing, it is forward rotation, and when the rotation direction of the crank is the same as the reverse rotation direction of the one-way bearing, it is reverse rotation.

[0010] In addition, in the present invention, when the user rotates the handle in a direction opposite to the forward rotation direction of the one-way bearing, the outer ring of the one-way bearing generates a torsional force on the inner wall of the torsion spring under the action of an artificial external force. Since the torsion spring itself cannot rotate in the mounting seat due to the action of the anti-rotation portion, the torsion spring in the present invention will loosen the one-way bearing under the action of the torsional force of the outer ring of the one-way bearing, so that the one-way bearing as a whole can rotate synchronously with the rotating shaft, thereby realizing the descent of the lifting table controlled by the crank handle. Since the torsion spring loosens the one-way bearing during the descent process, the user encounters less resistance during the rotation process, which saves the external force required to be applied by the user and improves the user's experience.

[0011] Preferably, the one-way bearing comprises an inner ring and an outer ring, a bearing sleeve is provided between the torsion spring and the one-way bearing, the torsion spring is interference fit with an outer wall of the bearing sleeve, and the bearing sleeve rotates synchronously with the outer ring of the one-way bearing.

[0012] Preferably, the inner wall of the bearing sleeve and the outer wall of the one-way bearing are provided with a first convex strip distributed along the axial direction of the rotating shaft at one place, and a first groove corresponding to the first convex strip is provided at the other place.

[0013] Preferably, the anti-rotation portion comprises a pin extending from the end of the torsion spring in the radial direction of the torsion spring, and a second slot for fixing the pin is provided in the mounting seat.

[0014] Preferably, the positive rotation direction of the one-way bearing is the same as the rotation direction of the torsion spring, and the pin is located at the end of the torsion spring close to the crank; or, the positive rotation direction of the one-way bearing is opposite to the rotation direction of the torsion spring, and the pin is located at the end of the torsion spring away from the crank.

[0015] Preferably, the contact surface between the one-way bearing and the rotating shaft is provided with a second convex strip distributed along the axial direction of the rotating shaft.

[0016] Preferably, the mounting base comprises a first shell and a second shell, and the rotating shaft is arranged at the joint of the first shell and the second shell.

[0017] Preferably, the surface of the rotating shaft is provided with a first groove and a second groove, the first groove and the second groove are respectively provided with a first limiting plate and a second limiting plate, and a conventional bearing is provided between the first limiting plate and the second limiting plate.

[0018] Preferably, two one-way bearings are provided between the bearing sleeve and the rotating shaft.

[0019] The present invention also discloses a lifting table, comprising a hand crank and a lifting column, wherein the hand crank is used to control the lifting and lowering of the lifting column, and the hand crank is any one of the hand cranks described above.

[0020] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0021] The present invention will be further described below in conjunction with the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0023] Figure 2 It is an exploded view of embodiment 1 of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure on the rotating shaft in Example 1 of the present invention;

[0025] Figure 4 It is a schematic structural diagram of a torsion spring, a bearing sleeve and a one-way bearing in Embodiment 1 of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the torsion spring in Example 1 of the present invention;

[0027] Figure 6 An exploded view of the bearing sleeve and the one-way bearing in Example 1 of the present invention;

[0028] Figure 7 This is an exploded view of a conventional bearing and a rotating shaft in Example 1 of the present invention. [Specific implementation method]

[0029] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiment 1:

[0034] like Figures 1 to 7As shown, this embodiment shows a hand crank for a lifting table with a self-locking structure, comprising a crank handle 1, a rotating shaft 3 and a mounting seat 2, the hand crank being used to control the lifting of the lifting table, the crank handle 1 being connected to the rotating shaft 3, the rotating shaft 3 being passed through the mounting seat 2, a one-way bearing 31 being provided on the rotating shaft 3, the one-way bearing 31 comprising an inner ring and an outer ring, a bearing sleeve 32 being sleeved on the one-way bearing 31, a torsion spring 33 being sleeved on the bearing sleeve 32, wherein the torsion spring 33 is interference fit with the outer wall of the bearing sleeve 32, the bearing sleeve 32 rotates synchronously with the outer ring of the one-way bearing 31, the inner ring of the one-way bearing 31 rotates synchronously with the rotating shaft 3, a stopper portion for limiting the rotation of the torsion spring 33 in the mounting seat 2 is provided at the end of the torsion spring 33, the stopper portion is fixed inside the mounting seat 2, when the rotation direction of the crank handle 1 is opposite to the positive rotation direction of the one-way bearing 31, the inner wall of the torsion spring 33 is loosened under the action of the overall rotation of the one-way bearing 31.

[0035] It should be noted that the direction in which the inner ring and the outer ring of the one-way bearing 31 can rotate relative to each other is the forward rotation direction of the one-way bearing 31, and the direction in which the inner ring and the outer ring cannot rotate relative to each other is the reverse rotation direction of the one-way bearing 31; when the rotation direction of the crank 1 is the same as the forward rotation direction of the one-way bearing 31, it is forward rotation, and when the rotation direction of the crank 1 is the same as the reverse rotation direction of the one-way bearing 31, it is reverse rotation.

[0036] This embodiment is mainly used to control the lifting of the lifting table. During use, the user controls the lifting of the lifting table by rotating the crank 1. When the rotation direction of the crank 1 is the same as the positive rotation direction of the one-way bearing 31, the crank 1 controls the lifting table to rise normally, and stops when it rises to an appropriate height. In a stationary state, the desktop and objects on the desktop will exert pressure on the lifting column, causing the crank 1 to have a tendency to reverse. The reverse direction of the crank 1 is opposite to the positive rotation direction of the one-way bearing 31, so the inner and outer rings of the one-way bearing 31 cannot rotate relative to each other. In addition, the torsion spring 3 3 itself cannot rotate in the mounting seat 2 due to the restriction of the anti-rotation part, and the torsion spring 33 holds the bearing sleeve 32 tightly, so the bearing sleeve 32 cannot rotate either. Under the restriction of the bearing sleeve 32, the outer ring of the one-way bearing 31 cannot rotate, so the one-way bearing 31 and the rotating shaft 3 cannot rotate, thereby realizing the self-locking of the hand crank. This embodiment realizes self-locking through the action of the torsion spring 33 on the one-way bearing 31, and its locking effect is good. It is generally difficult for non-human external force to break through the locking of the torsion spring 33 on the one-way bearing 31. Therefore, this embodiment can improve the stability of the lifting table and allow users to use it with more confidence.

[0037] In addition, in the present embodiment, when the user rotates the crank 1 in a direction opposite to the positive rotation direction of the one-way bearing 31, the outer ring of the one-way bearing 31 generates a torsional force on the inner wall of the torsion spring 33 under the action of an artificial external force. Since the torsion spring 33 itself cannot rotate in the mounting base 2 due to the action of the anti-rotation portion, the torsion spring 33 in the present embodiment will loosen the one-way bearing 31 under the action of the torsional force of the outer ring of the one-way bearing 31, so that the one-way bearing 31 as a whole can rotate synchronously with the rotating shaft 3, thereby realizing the crank 1 controlling the lifting table to descend. Since the torsion spring 33 loosens the one-way bearing 31 during the descent process, the user encounters less resistance during the rotation process, which saves the external force required to be applied by the user and improves the user's experience.

[0038] In order to enable the bearing sleeve 32 and the outer ring of the one-way bearing 31 to always keep synchronous rotation, the inner wall of the bearing sleeve 32 in this embodiment is provided with a first convex strip 321 distributed along the axial direction of the rotating shaft 3, and the outer ring surface of the one-way bearing 31 is provided with a first groove 311 corresponding to the first convex strip 321. When the outer ring of the one-way bearing 31 rotates, the first groove 311 on the outer ring surface drives the first convex strip 321, so that the bearing sleeve 32 and the outer ring of the one-way bearing 31 always keep synchronous rotation, so that the overall structure of this embodiment remains stable. In addition, the bearing sleeve 32 is arranged between the one-way bearing 31 and the torsion spring 33, which can avoid direct contact between the one-way bearing 31 and the torsion spring 33, reduce the friction between the one-way bearing 31 and the torsion spring 33, and protect the one-way bearing 31. Of course, it should be understood that the first ridge 321 can also be arranged on the outer ring surface of the one-way bearing 31, and the corresponding first groove 311 can be arranged on the inner wall of the bearing sleeve 32, and the structure of the first ridge 321 and the first groove 311 can also be other similar structures that can realize the synchronous rotation of the bearing sleeve 32 and the one-way bearing 31.

[0039] Regarding the specific structure of the torsion spring 33, the anti-rotation portion in this embodiment includes a pin 331 extending radially along the end of the torsion spring 33, and a second slot for fixing the pin 331 is provided in the mounting seat 2. The function of the pin 331 is to limit the rotation of the torsion spring 33 inside the mounting seat 2, so that the torsion spring 33 can apply resistance to the rotation of the bearing sleeve 32 in a clamped state. In addition, the positive rotation direction of the one-way bearing 31 is opposite to the rotation direction of the torsion spring 33, and the pin 331 is located at the end of the torsion spring 33 away from the crank 1. When the user rotates the crank 1 in the direction opposite to the positive rotation direction of the one-way bearing 31, the inner ring and the outer ring of the one-way bearing 31 cannot rotate relative to each other. Therefore, the rotating shaft 3, the one-way bearing 31 and the bearing sleeve 32 rotate synchronously in the reverse direction of the one-way bearing 31. At this time, the outermost bearing sleeve 32 will apply a torsional force to the inner wall of the torsion spring 33. When the rotation direction of the torsion spring 33 is the same as the direction of the torsion force applied to its inner wall, that is, the rotation direction of the torsion spring 33 is opposite to the positive rotation direction of the one-way bearing 31, if the pin 331 is located at the end of the torsion spring 33 away from the crank 1, the torsion spring 33 will gradually loosen under the action of the torsion force. The bearing sleeve 32 enables the bearing sleeve 32 to rotate normally, that is, the reversal of the crank 1 is achieved; on the contrary, if the pin 331 is arranged at the end of the torsion spring 33 close to the crank 1, the torsion spring 33 will hold the bearing sleeve 32 under the action of the torsion force, so that the bearing sleeve 32 cannot rotate, that is, the crank 1 cannot be reversed; so when the rotation direction of the torsion spring 33 is opposite to the forward direction of the one-way bearing 31, the pin 331 should be arranged at the end of the torsion spring 33 away from the crank 1, so that when the crank 1 is reversed manually, as long as the locking of the torsion spring 33 on the bearing sleeve 32 is broken, the crank 1 can be reversed normally, and because the torsion spring 33 loosens the restraint on the bearing sleeve 32, the user encounters less resistance during the reversal process, which allows the user to easily complete the operation and improve the user experience.

[0040] Of course, in other embodiments, the forward rotation direction of the one-way bearing 31 may be the same as the rotation direction of the torsion spring 33, and the pin 331 may be located at one end of the torsion spring 33 close to the crank 1, so that the crank 1 can be reversed normally. Its working principle is similar to the above principle and will not be elaborated here.

[0041] In order to make the inner ring of the one-way bearing 31 and the rotating shaft 3 always keep synchronous rotation, in this embodiment, the inner ring of the one-way bearing 31 is provided with a second convex strip 310 distributed along the axial direction of the rotating shaft 3, so that the inner ring of the one-way bearing 31 and the rotating shaft 3 are interference fit, so that the two are tightly connected and can always keep synchronous rotation. Of course, it can be understood that the second convex strip 310 can also be provided on the outer surface of the rotating shaft 3. In addition, in other embodiments, the inner ring of the one-way bearing 31 and the rotating shaft 3 can also be splined to achieve synchronous rotation of the two.

[0042] Regarding the mounting base 2, the mounting base 2 in this embodiment is formed by splicing a first shell 22 and a second shell 21, and the rotating shaft 3 is arranged at the joint of the first shell 22 and the second shell 21. After the first shell 22 and the second shell 21 are spliced, a second card slot for fixing the pin 331 is formed. In addition, the first shell 22 is used to be fixed under the table top of the lifting table, and the first shell 22 is provided with a hole for the fixing part to pass through.

[0043] In order to make the crank 1 in this embodiment more smooth during the reversal process, the surface of the rotating shaft 3 in this embodiment is provided with a first groove 351 and a second groove 361, and the first groove 351 and the second groove 361 are respectively provided with a first limit plate 35 and a second limit plate 36, and a conventional bearing 34 is provided between the first limit plate 35 and the second limit plate 36. The first limit plate 35 and the second limit plate 36 limit the axial movement of the conventional bearing 34 along the rotating shaft 3. When the crank 1 is reversed, the conventional bearing 34 can make the rotation of the rotating shaft 3 smoother.

[0044] Regarding the one-way bearing 31, in this embodiment, two one-way bearings 31 are provided on the rotating shaft, and the bearing sleeve 32 is simultaneously sleeved on the two one-way bearings 31. The two one-way bearings 31 can improve the self-locking force of this embodiment, and also provide double protection for this embodiment, thereby avoiding the loss of self-locking ability of this embodiment due to the failure of a single one-way bearing 31.

[0045] It can be understood that the hand crank described in this embodiment is not only applicable to lift tables, but also applicable to lift beds, lift sofas and other lift furniture or medical equipment.

[0046] Embodiment 2:

[0047] This embodiment shows a lifting table, including a table top, a hand crank and a lifting column, the hand crank is used to control the lifting and lowering of the lifting column, the hand crank adopts the hand crank as described in the above-mentioned embodiment 1, the self-locking effect of this embodiment is good, the firmness is high, it is difficult for non-human large external force to break the self-locking, the overall stability is strong, during the descent process, the user encounters less resistance, which allows the user to complete the operation more easily, and improves the user's experience.

[0048] In this embodiment, the static self-locking of the lifting table is 1000N, and the dynamic load range is 0-800N.

[0049] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A hand crank for a lifting table with a self-locking structure, comprising a crank handle, a rotating shaft and a mounting seat, wherein the hand crank is used to control the lifting of the lifting table, and is characterized in that: The crank handle is connected to the rotating shaft, and the rotating shaft is passed through the mounting seat. A one-way bearing is provided on the rotating shaft, and a torsion spring is sleeved on the one-way bearing. A stop portion is provided at the end of the torsion spring for limiting the rotation of the torsion spring in the mounting seat, and the stop portion is fixed inside the mounting seat. When the rotation direction of the crank handle is opposite to the positive rotation direction of the one-way bearing, the one-way bearing generates a torsional force on the inner wall of the torsion spring to loosen the torsion spring. A second convex strip distributed along the axial direction of the rotating shaft is provided on the contact surface between the one-way bearing and the rotating shaft. The one-way bearing comprises an inner ring and an outer ring. A bearing sleeve is provided between the torsion spring and the one-way bearing. The torsion spring is interference fit with the outer wall of the bearing sleeve. The bearing sleeve rotates synchronously with the outer ring of the one-way bearing. One of the inner wall of the bearing sleeve and the outer wall of the one-way bearing is provided with a first convex strip distributed along the axial direction of the rotating shaft, and the other is provided with a first groove corresponding to the first convex strip.

2. The hand crank of the lifting table with a self-locking structure according to claim 1 is characterized in that: The anti-rotation portion comprises a pin at the end of the torsion spring extending in the radial direction of the torsion spring, and a second clamping groove for fixing the pin is provided in the mounting seat.

3. The hand crank of the lifting table with a self-locking structure according to claim 2 is characterized in that: The positive rotation direction of the one-way bearing is the same as the rotation direction of the torsion spring, and the pin is located at the end of the torsion spring close to the crank; or, the positive rotation direction of the one-way bearing is opposite to the rotation direction of the torsion spring, and the pin is located at the end of the torsion spring away from the crank.

4. The hand crank of the lifting table with a self-locking structure according to claim 1 is characterized in that: The mounting seat comprises a first shell and a second shell, and the rotating shaft is arranged at the joint of the first shell and the second shell.

5. The hand crank of the lifting table with a self-locking structure according to claim 1 is characterized in that: The surface of the rotating shaft is provided with a first groove and a second groove, the first groove and the second groove are provided with a first limiting plate and a second limiting plate respectively, and a conventional bearing is provided between the first limiting plate and the second limiting plate.

6. The hand crank of the lifting table with a self-locking structure according to claim 1 is characterized in that: Two one-way bearings are arranged between the bearing sleeve and the rotating shaft.

7. A lifting table, comprising a hand crank and a lifting column, wherein the hand crank is used to control the lifting and lowering of the lifting column, characterized in that: The hand crank adopts the hand crank described in any one of claims 1 to 6.

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