Clutch, wheel module and medical trolley

Abstract

The invention relates to a clutch, a wheel module and a medical trolley. The clutch comprises a first connecting ring and a second connecting ring, the first connecting ring is provided with a first annular part and a shaft-shaped part, and the shaft-shaped part is provided with a long hole track; the second connecting ring is sleeved on the first connecting ring; the first connecting ring is sleeved with the clutch ring, and a spring is arranged between the clutch ring and the second connecting ring; the running and stopping mechanism is arranged on the long hole track; the travel stopping mechanism can be pushed to drive the clutch ring to move in the direction away from the first connecting ring and leave the first connecting ring, and the travel stopping mechanism can also be locked to keep the clutch ring at the position away from the first connecting ring. The clutch ring is driven by the running and stopping mechanism to move, and free switching between an electronic power mode in which the power device drives the wheels to rotate and a free mode in which the wheels rotate freely can be achieved; and the free mode can be used as a standby mode, and can be switched to the free mode under the condition that the power device is completely invalid.

Description

Technical Field

[0001] This patent relates to the field of medical equipment, and in particular to a clutch, a wheel module and a medical cart using the clutch. Background Art

[0002] Medical carts are often used in the medical field. These carts can serve as a platform to provide a movable platform for medical robots or tool carriers. Medical carts are usually equipped with a power system for movement. In the prior art, the power system usually includes a motor for providing power and wheels connected to the motor through various speed reducers, gearboxes and other devices. The wheels are driven by the motor to drive the cart to move in the medical environment.

[0003] However, since it is inconvenient to charge the trolley, it may run out of power sometimes. At this time, the medical trolley can also be pushed manually. Due to the principle of electromagnetic induction, the motor will produce resistance to the movement of the wheels when the trolley is pushed by hand. Therefore, a clutch needs to be provided so that the wheels are separated from the transmission components such as the motor and reducer when pushed manually. The clutch of the prior art usually relies on the switch of the solenoid valve. When the trolley runs out of power, the solenoid valve lacks power supply and is inconvenient to use. However, providing an additional power supply device for the solenoid valve, such as providing a battery to power the solenoid valve, will undoubtedly increase the difficulty and cost of maintaining the trolley. Summary of the invention

[0004] In order to solve or at least partially solve the above technical problems, the first aspect of the present invention provides a clutch, comprising:

[0005] A first connecting ring, wherein the first connecting ring is used to connect a power device;

[0006] The first connecting ring comprises a first annular portion and a shaft portion connected to the first annular portion and extending along the axial direction, wherein the shaft portion comprises a long hole track arranged along the axial direction;

[0007] a second connecting ring, which is sleeved on the first connecting ring, and the second connecting ring is used to connect the wheel, and the distance between the first connecting ring and the second connecting ring is fixed;

[0008] A clutch ring, which is sleeved on the first connecting ring, and a spring is arranged between the clutch ring and the second connecting ring. Under the elastic force of the spring, the clutch ring tends to move toward the direction where the first connecting ring is located to abut against the first connecting ring;

[0009] A stop mechanism is arranged on the long hole track and contacts with the clutch ring;

[0010] The stop mechanism can be pushed to drive the clutch ring to overcome the elastic force of the spring, move along the direction of the long hole track in the direction away from the first connecting ring and leave the first connecting ring. The stop mechanism can also be locked to keep the clutch ring in a position away from the first connecting ring.

[0011] A further technical solution may also be that the behavior and stopping mechanism includes:

[0012] A connecting column, the connecting column comprising a column body and side wings arranged on the column body, the side wings being connected to the long hole track so that the connecting column can move along the long hole track;

[0013] A stopper is connected to the connecting column and can fix the position of the connecting column.

[0014] Preferably, the first connecting ring is sleeved on the connecting column;

[0015] The side wing passes through the long hole track so that the connecting column can move along the long hole track;

[0016] The portion of the side wing extending out of the long hole track is in abutment contact with the clutch ring.

[0017] Preferably, the stopping mechanism further comprises:

[0018] A handle, fixed on the connecting column;

[0019] The stopper is sleeved on the connecting column and contacts with the first connecting ring;

[0020] The handle adjusts the distance between itself and the first connecting ring under the action of external force, thereby driving the connecting column to move along the long hole track;

[0021] The stopper is used to lock the handle so that the distance between the handle and the first connecting ring is fixed.

[0022] Preferably, the stopper is fixed on the first connecting ring to prevent the stopper from rotating circumferentially relative to the first connecting ring;

[0023] The stopper is provided with a guide track along the circumferential direction, and the handle is provided with a guide portion matched with the guide track;

[0024] The handle can rotate in the circumferential direction under the action of an external force. When the handle rotates, the guide portion pushes the handle away from or close to the stopper under the guidance of the guide track.

[0025] Preferably, the guide track comprises raised portions which are periodically repeated along the circumferential direction.

[0026] The shape of the guide portion at least partially matches the guide rail, so that when the raised portion of the guide rail and the raised portion of the guide portion are opposite, the handle is moved away from the stopper, and when the non-raised portion of the guide rail and the raised portion of the guide portion are opposite, the handle is moved closer to the stopper;

[0027] A locking recess is provided on the protruding portion of at least one of the guide portion and the guide rail, and the locking recess is used for the protruding portion of the other to be locked in, so as to lock the handle at a position away from the stopper.

[0028] Preferably, the raised portion of the guide track has a smooth curved profile, and one side thereof is relatively gentle in the circumferential direction, and the other side is relatively steep;

[0029] The locking recess is located at a portion of the convex portion of the guide portion adjacent to a steeper side of the guide track.

[0030] A further technical solution may also be that the clutch ring comprises:

[0031] A bottom plate, on which a plurality of clamping parts are arranged;

[0032] The first connecting ring is provided with the same number of clamped parts in one-to-one correspondence, and when the clutch ring abuts against the first connecting ring, the clamping parts are clamped with the clamped parts.

[0033] Preferably, the clutch ring further comprises:

[0034] A side plate, the side plate is arranged around the outer periphery of the bottom plate, and the side plate protrudes toward the direction where the first connecting ring is located;

[0035] The thickness of the first connecting ring is smaller than the height of the side plate, and the outer diameter of the first connecting ring is smaller than the diameter of the circle enclosed by the inner wall of the side plate.

[0036] The second aspect of this patent also provides a wheel module, including a wheel and the clutch described above.

[0037] The third aspect of the present invention also provides a medical trolley, comprising:

[0038] A vehicle body, wheels, and a power device arranged on the vehicle body;

[0039] The power device and the wheels are connected via the clutch described above.

[0040] Compared with the prior art, this patent uses a stop mechanism to drive the clutch ring to move, and can switch freely between the electronic power mode in which the power device drives the wheel to rotate and the free mode in which the wheel rotates freely; the free mode can be used as a backup, and can be switched to the free mode in the event of a complete failure of the power device. The clutch switching process does not require electrical control or power intervention, so compared to the clutch controlled by an electromagnet, no power is required, which significantly simplifies the structure and improves reliability and safety. The clutch with a purely mechanical structure does not need to consider battery life, so it has a longer service life. Moreover, in the free mode, the wheel is disconnected from the power device, which can reduce friction and energy consumption, and is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the implementation of this patent, the following is a brief introduction to the relevant drawings. It can be understood that the drawings described below are only used to illustrate some implementations of this patent, and ordinary technicians in this field can also obtain many other technical features and connection relationships not mentioned in this article based on these drawings.

[0043] Figure 1 This is a schematic diagram of the structure of the clutch in the embodiment of this patent;

[0044] Figure 2 This is a schematic diagram of the structure of the wheel module in the embodiment of this patent;

[0045] Figure 3 This is a schematic diagram of the explosion mechanism of the clutch in the embodiment of this patent;

[0046] Figure 4 This is a schematic diagram of an exploded structure of a clutch from another perspective in an embodiment of the present patent;

[0047] Figure 5 This is a schematic diagram of the structure of the stopper in the embodiment of this patent;

[0048] Figure 6 This is a schematic diagram of the structural cross-section of the clutch in the embodiment of this patent.

[0049] Description of reference numerals:

[0050] A. Clutch; B. Power unit; C. Wheel;

[0051] 1. first connecting ring; 11. first annular portion; 12. shaft portion; 13. long hole track; 14. clamped member;

[0052] 2. Second connecting ring;

[0053] 3. Clutch ring; 31. Bottom plate; 32. Connecting piece;

[0054] 4. Spring;

[0055] 5. Stop mechanism; 51. Connecting column; 511. Column body; 512. Side wing;

[0056] 52, stopper; 521, guide track; 522, raised part; 523, recessed part;

[0057] 53. Handle; 531. Guide part. DETAILED DESCRIPTION

[0058] The patent is described in detail below in conjunction with the accompanying drawings.

[0059] Embodiment 1

[0060] This embodiment discloses a clutch A, such as Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, including:

[0061] A first connecting ring 1, wherein the first connecting ring 1 is used to connect a power device B;

[0062] The first connecting ring 1 comprises a first annular portion 11 and a shaft portion 12 connected to the first annular portion 11 and extending along the axial direction, wherein the shaft portion 12 comprises a long hole track 13 arranged along the axial direction;

[0063] A second connecting ring 2, which is sleeved on the first connecting ring 1, and the second connecting ring 2 is used to connect the wheel C, and the distance between the first connecting ring 1 and the second connecting ring 2 is fixed;

[0064] A clutch ring 3 is sleeved on the first connecting ring 1, and a spring 4 is provided between the clutch ring 3 and the second connecting ring 2. Under the elastic force of the spring 4, the clutch ring 3 tends to move toward the direction of the first connecting ring 1 to abut against the first connecting ring 1;

[0065] The travel stop mechanism 5 is arranged on the long hole track 13 and contacts the clutch ring 3;

[0066] The stopping mechanism 5 can be pushed to drive the clutch ring 3 to overcome the elastic force of the spring 4, move along the direction of the long hole track 13 in the direction away from the first connecting ring 1 and leave the first connecting ring 1. The stopping mechanism 5 can also be locked to keep the clutch ring 3 in a position away from the first connecting ring 1.

[0067] The stopping mechanism 5 is arranged on the long hole track 13 , and the shape of the long hole track 13 can be adapted to the stopping mechanism 5 , so that the long hole track 13 can be used as a track for the stopping mechanism 5 to guide the movement of the stopping mechanism 5 and improve the stability of the movement of the stopping mechanism 5 .

[0068] The clutch ring 3 is sleeved on the first connecting ring 1 and can move back and forth along the axial direction of the first connecting ring 1. In this embodiment, under the elastic force of the spring 4, the clutch ring 3 tends to move in the direction of the first connecting ring 1 to abut against the first connecting ring 1. When the power device B drives the first connecting ring 1 to rotate, the first connecting ring 1 can drive the clutch ring 3 to rotate through the friction between the first connecting ring 1 and the clutch ring 3 abutting against the first connecting ring 1. Correspondingly, the rotation of the clutch ring 3 can drive the rotation of the second connecting ring 2, and then drive the wheel C connected to the second connecting ring 2 to rotate.

[0069] The stop mechanism 5 is pushed to drive the clutch ring 3 to overcome the elastic force of the spring 4, and move in the direction away from the first connecting ring 1 along the direction of the long hole track 13 and leave the first connecting ring 1. In this way, the connection between the first connecting ring 1 and the clutch ring 3 is disconnected, and the driving force of the power device B cannot be transmitted to the clutch ring 3, so that the power device B cannot drive the second connecting ring 2 and the wheel C to rotate.

[0070] It should be noted that, in this embodiment, the second connecting ring 2 can be sleeved on the shaft-shaped portion 12 on the first connecting ring 1. The shaft-shaped portion 12 can serve as the rotation axis of the second connecting ring 2, so that the second connecting ring 2 can rotate freely on the shaft-shaped portion 12. Alternatively, the second connecting ring 2 can be connected to the clutch ring 3, and the clutch ring 3 is sleeved on the shaft-shaped portion 12 of the first connecting ring 1. In this way, the second connecting ring 2 can be connected to the shaft-shaped portion 12 through the clutch ring 3, and can use it as the rotation axis, so that the second connecting ring 2 can rotate freely on the shaft-shaped portion 12.

[0071] In some embodiments, the clutch ring 3 is configured to always remain connected to the second connection ring 2, that is, the clutch ring 3 always remains connected to the second connection ring 2 during its movement along the axial direction of the first connection ring 1. Alternatively, the clutch ring 3 can also be configured in another form, that is, when the clutch ring 3 abuts against the first connection ring 1, the clutch ring 3 is connected to the second connection ring 2; and when the clutch ring 3 leaves the first connection ring 1, the clutch ring 3 is disconnected from the second connection ring 2.

[0072] In addition, the stop mechanism 5 can also be locked to keep the clutch ring 3 away from the first connecting ring 1, that is, to keep the wheel C disconnected from the power device B. When the stop mechanism 5 is unlocked, the spring 4 can use its elastic force to hold the clutch ring 3 against the first connecting ring 1 again and drive the stop mechanism 5 back to the initial position.

[0073] The clutch A, by driving the clutch ring 3 to move through the stop mechanism 5, can switch freely between the electronic power mode in which the power device B drives the wheel C to rotate and the free mode in which the wheel C rotates freely; the free mode can be used as a backup and can be switched to the free mode in the event of a complete failure of the power device B. The switching process of the clutch A does not require electrical control or power intervention, so compared to the clutch controlled by an electromagnet, no power is required, which significantly simplifies the structure and improves reliability and safety. The clutch with a purely mechanical structure does not need to consider battery life, so it has a longer service life. Moreover, in the free mode, the wheel C is disconnected from the power device B, which can reduce friction and energy consumption, and is more environmentally friendly.

[0074] This embodiment also discloses a wheel module, such as Figure 2 As shown, clutch A described above is applied.

[0075] The wheel module, which uses the above-mentioned clutch A, also has the above-mentioned advantages.

[0076] This embodiment also discloses a medical trolley, comprising a body, wheels C, and a power device B arranged on the body, wherein the power device B and the wheels C are connected via the clutch A.

[0077] The medical trolley, which uses the above wheel module, also has the above advantages.

[0078] Embodiment 2

[0079] This embodiment is a further improvement based on the first embodiment, and the improvement is: Figure 3 and Figure 4 As shown, the stopping mechanism 5 may include:

[0080] The connecting column 51 includes a column body 511 and side wings 512 arranged on the column body 511 , and the side wings 512 are connected to the long hole track 13 so that the connecting column 51 can move along the long hole track 13 .

[0081] The shape of the long hole track 13 can be adapted to the connecting column 51, so that the connecting column 51 can move along its axial direction in the long hole track 13. The side wing 512 is connected to the long hole track 13 and can cooperate with the long hole track 13. On the one hand, it can further provide guidance for the movement of the connecting column 51 in the long hole track 13, and on the other hand, it can also limit the axial rotation of the connecting column 51 in the long hole track 13. In some embodiments, the long hole track 13 may include a long hole portion corresponding to the column body of the connecting column 51 and a wing portion located on one side of the long hole portion and corresponding to the side wing 512.

[0082] In a preferred embodiment, the first connecting ring 1 is sleeved on the connecting column 51;

[0083] The side wing 512 passes through the long hole track 13 so that the connecting column 51 can move along the long hole track 13;

[0084] The portion of the wing 512 extending out of the long hole track 13 is in abutment contact with the clutch ring 3 .

[0085] Specifically, Figure 3 and Figure 4 As shown, the wing 512 can extend in the radial direction of the long hole track 13 to extend from the inside of the long hole track 13 to the outside of the long hole track 13, and the part thereof extending outside the long hole track 13 can abut against the clutch ring 3, so that the clutch ring 3 can move synchronously with the stop mechanism 5. Specifically, when the stop mechanism 5 is pushed to move in a direction away from the first connecting ring 1, the wing 512 can abut against the clutch ring 3 so that the clutch ring 3 and the stop mechanism 5 move together in a direction away from the first connecting ring 1 and leave the first connecting ring 1. On the contrary, when the stop mechanism 5 is unlocked, the spring 4 can abut the clutch ring 3 against the first connecting ring 1 again through its elastic force, and when the clutch ring 3 moves in the direction of the first connecting ring 1, the clutch ring 3 can abut against the wing 512, thereby driving the stop mechanism 5 to move to return to the initial position.

[0086] In another more preferred embodiment, the side wings 512 may be evenly arranged along the circumference of the cylinder. In this way, on the one hand, the guiding effect of the side wings 512 can be made more uniform and stable; on the other hand, the mutual abutment between the multiple side wings 512 evenly distributed around the circumference and the clutch ring 3 is more uniform, which is conducive to the smooth movement of the clutch ring 3 and the stop mechanism 5.

[0087] The stop mechanism 5 may further include a stopper 52, which is connected to the connecting column 51 and can fix the position of the connecting column 51. By setting the stopper 52, the stop mechanism 5 can be locked to keep the clutch ring 3 at a position away from the first connecting ring 1.

[0088] In some embodiments, the stopper 52 can be a latching position set on the connecting column 51, and a latching block corresponding to the latching position. When the travel stop mechanism 5 is pushed, the connecting column 51 moves on the long hole track 13 in a direction away from the first connecting ring 1, so that the latching block can cooperate with the latching position to fix the position of the connecting column 51. Specifically, Figure 1 As shown, the clamping block can be arranged on the first connecting ring 1 , or the clamping block can be abutted against the first connecting ring 1 .

[0089] In some other embodiments, the stopper 52 may also be a threaded section provided on the connection column 51 and a nut matched with the threaded section, wherein the threaded section is located at an end of the connection column 51 away from the first connection ring 1. One end of the nut may be abutted against the first connection ring 1, and when the nut is rotated, the relative position of the nut on the threaded section may be adjusted through the threaded cooperation between the nut and the threaded section, thereby controlling the position of the connection column 51. Preferably, the nut may be an anti-drop nut.

[0090] In addition, the stopper 52 can also be a pin hole provided on the connecting column 51, and a plug with a spring matched with the pin hole. Specifically, the plug can be provided on the first connecting ring 1, and the plug can tend to move in the direction of the connecting column 51 under the elastic force of the spring. When the connecting column 51 moves to the specified position, the plug can move in the direction of the connecting column 51 under the elastic force of the spring to be inserted into the pin hole on the connecting column 51, thereby fixing the connecting column 51. Accordingly, when the fixing of the connecting column 51 needs to be released, it is only necessary to overcome the elastic force of the spring and pull the plug out of the pin hole. In a preferred embodiment, a ball can be provided at the end of the plug, and the ball is used to contact the surface of the connecting column 51. Through the provision of the ball, when the connecting column 51 moves, the ball can be abutted against the surface of the connecting column 51 and roll, avoiding the direct contact of the plug body with the connecting column 51, preventing the plug body from scratching the surface of the connecting column 51, and effectively extending the service life of the connecting column 51.

[0091] Embodiment 3

[0092] This embodiment is a further improvement made based on the second embodiment, and the improvement is as follows: Figure 3 and Figure 4 As shown, the travel stop mechanism 5 also includes:

[0093] A handle 53, fixed on the connecting column 51;

[0094] The stopper 52 is sleeved on the connecting column 51 and contacts the first connecting ring 1;

[0095] The handle 53 adjusts the distance between itself and the first connecting ring 1 under the action of external force, thereby driving the connecting column 51 to move along the long hole track 13;

[0096] The stopper 52 is used to lock the handle 53 so that the distance between the handle 53 and the first connecting ring 1 is fixed.

[0097] The handle 53 can provide a gripping position for the connecting column 51, so that the connecting column 51 can be easily driven to move and the distance between the connecting column 51 and the first connecting ring 1 can be adjusted by grasping the handle 53, which is more convenient. Moreover, the connecting column 51 is driven to move by grasping the handle 53 instead of directly grasping the connecting column 51. This method can better protect the connecting column 51 and effectively extend the service life of the connecting column 51.

[0098] The handle 53 can also serve as a force-bearing portion to cooperate with the stopper 52, so that the distance between the handle 53 and the first connecting ring 1 is fixed, thereby fixing the position of the connecting column 51. In this way, it is possible to avoid the situation where the stopper 52 directly acts on the connecting column 51, causing damage to the connecting column 51 or scratches on the surface, and the service life of the connecting column 51 can be extended.

[0099] In some embodiments, the handle 53 can be configured to be detachable, that is, the handle 53 can be detachably connected to the connecting column 51. With such a configuration, on the one hand, the handle 53 of corresponding material or shape can be replaced according to the user's requirements and the application scenario of the clutch A; on the other hand, the handle 53 that is worn out due to exposure can be replaced separately by disassembly. In addition, the handle 53 is configured to be detachable, and when the handle 53 is replaced, it can be replaced separately, avoiding the need to replace the connecting column 51 with a complex structure and higher cost at the same time, which can effectively save costs. Specifically, the handle 53 can be fixed to the connecting column 51 by bolt connection.

[0100] In a preferred embodiment, Figure 5 As shown, the stopper 52 may be fixed on the first connecting ring 1 to prevent the stopper 52 from rotating circumferentially relative to the first connecting ring 1;

[0101] The stopper 52 is provided with a guide track 521 along the circumferential direction, and the handle 53 is provided with a guide portion 531 matched with the guide track 521;

[0102] The handle 53 can rotate in the circumferential direction under the action of an external force. When the handle 53 rotates, the guide portion 531 pushes the handle 53 away from or close to the stopper 52 under the guidance of the guide track 521 .

[0103] By setting the guide track 521 and the guide part 531, the handle 53 can move away from or close to the stopper 52 when rotating. In some embodiments, the handle 53 can be rotatably fixed on the connecting column 51, so that the relative position of the handle 53 and the connecting column 51 is fixed and the handle 53 can rotate relative to the connecting column 51. In this way, when the handle 53 moves, it can drive the connecting column 51 to move on the long hole track 13, and then drive the clutch ring 3 to move, and can freely switch between the electronic power mode in which the power device B drives the wheel C to rotate and the free mode in which the wheel C rotates freely.

[0104] In some embodiments, the stopper 52 may be provided with an external thread, and the handle 53 may be provided with an internal thread corresponding to the external thread. When the handle 53 is rotated, the distance between the handle 53 and the stopper 52 is adjusted through the cooperation of the external thread and the internal thread, thereby driving the connecting column 51 to move to adjust the distance between the clutch ring 3 and the first connecting ring 1.

[0105] In some other preferred embodiments, Figure 5 As shown, the guide track 521 may include raised portions 522 that are periodically repeated along the circumferential direction.

[0106] The shape of the guide portion 531 at least partially matches the guide rail 521, so that when the raised portion 522 of the guide rail 521 and the raised portion 522 of the guide portion 531 are opposite to each other, the handle 53 is moved away from the stop member 52, and when the non-raised portion of the guide rail 521 and the raised portion of the guide portion 531 are opposite to each other, the handle 53 is moved close to the stop member 52.

[0107] By setting the periodically repeated raised portion 522, the handle 53 can be periodically moved closer to or away from the stopper 52 during the rotation process through the cooperation between the guide track 521 and the guide portion 531. Due to the connection between the handle 53 and the connecting column 51, the periodic movement of the handle 53 can drive the connecting column 51 connected to the handle 53 to reciprocate on the long hole track 13, thereby driving the clutch ring 3 to make periodic reciprocating movements closer to or away from the first connecting ring 1, so that the clutch A can be switched back and forth between the electronic power mode and the free mode in which the wheel C rotates freely.

[0108] In addition, if Figure 5 As shown, in the guide portion 531 and the guide rail 521 , a locking recess 523 is provided on the raised portion 522 of at least one of them, and the locking recess 523 is used for the raised portion 522 of the other to be locked in, so as to lock the handle 53 at a position away from the stop member 52 .

[0109] By setting the positioning recess 523 and the convex part 522, when the positioning recess 523 corresponds to the convex part 522, a relatively large external force is required to rotate the handle 53 in any circumferential direction. In this way, when the user grasps the handle 53, sufficient external force can be used to overcome the elastic force of the spring 4 and rotate the handle 53 so that the handle 53 rotates circumferentially to move away from or close to the stopper 52; and when the user stops providing the external force, the handle 53 itself is difficult to rotate under the unexpected sudden external force to overcome the elastic force of the spring 4, thereby achieving the locking of the relative position between the handle 53 and the stopper 52, that is, the handle 53 is locked at a position away from the stopper 52.

[0110] In other preferred embodiments, Figure 5 As shown, the raised portion 522 of the guide track 521 has a smooth curved profile, and one side thereof is relatively gentle in the circumferential direction, and the other side is relatively steep;

[0111] The locking recess 523 is located at a portion of the protruding portion 522 of the guiding portion 531 adjacent to a steeper side of the guiding track 521 .

[0112] The raised portion 522 is configured to have a smooth curved profile, so that the rotation of the handle 53 can be smoother and more labor-saving. Moreover, when the handle 53 is rotated in the direction of the gentle side compared to the direction of the steep side, it is more labor-saving, which can be used to determine the direction of rotation of the handle 53 and is helpful for the user to identify the direction of rotation. In addition, after the handle 53 is rotated to the highest point in the direction of the gentle side, it continues to rotate to enter the steeper side, and the handle 53 can be driven to continue to rotate quickly to return to the lowest point. Through the above configuration, the action of rotating the handle 53 is smooth and has a fool-proof effect.

[0113] In this embodiment, if Figure 3 and Figure 4 As shown, the clutch ring 3 may include:

[0114] A bottom plate 31, on which a plurality of clamping parts 32 are arranged;

[0115] The first connecting ring 1 is provided with the same number of clamped parts 14 in one-to-one correspondence. When the clutch ring 3 abuts against the first connecting ring 1 , the clamping parts 32 are clamped with the clamped parts 14 .

[0116] By setting the clamping member 32 and the clamped member 14, when the clutch ring 3 is abutted against the first connecting ring 1, the clutch ring 3 can be connected to the first connecting ring 1, so that the first connecting ring 1 driven to rotate by power can drive the clutch ring 3 to rotate, and then drive the second connecting ring 2 and the wheel C set on the second connecting ring 2 to rotate.

[0117] Compared with relying solely on friction to achieve transmission, the above structure has better stability and the load capacity of the trolley is also increased.

[0118] Finally, it should be noted that ordinary technicians in this field can understand that in order to make readers better understand this patent, the implementation methods of this patent propose many technical details. However, even without these technical details and various changes and modifications based on the above-mentioned implementation methods, the technical solutions claimed for protection by the claims of this patent can be basically realized. Therefore, in practical applications, various changes can be made to the above-mentioned implementation methods in form and details without departing from the spirit and scope of this patent.

Claims

1. A clutch, characterized in that: include: A first connecting ring, wherein the first connecting ring is used to connect a power device; The first connecting ring comprises a first annular portion and a shaft portion connected to the first annular portion and extending along the axial direction, wherein the shaft portion comprises a long hole track arranged along the axial direction; a second connecting ring, which is sleeved on the first connecting ring, and the second connecting ring is used to connect the wheel, and the distance between the first connecting ring and the second connecting ring is fixed; A clutch ring, which is sleeved on the first connecting ring, and a spring is arranged between the clutch ring and the second connecting ring. Under the elastic force of the spring, the clutch ring tends to move toward the direction where the first connecting ring is located to abut against the first connecting ring; A stop mechanism is arranged on the long hole track and contacts with the clutch ring; The stop mechanism can be pushed to drive the clutch ring to overcome the elastic force of the spring, move along the direction of the long hole track in the direction away from the first connecting ring and leave the first connecting ring. The stop mechanism can also be locked to keep the clutch ring in a position away from the first connecting ring.

2. The clutch according to claim 1, characterized in that: The said institutions include: A connecting column, the connecting column comprising a column body and side wings arranged on the column body, the side wings being connected to the long hole track so that the connecting column can move along the long hole track; A stopper is connected to the connecting column and can fix the position of the connecting column.

3. The clutch according to claim 2, characterized in that: The first connecting ring is sleeved on the connecting column; The side wing passes through the long hole track so that the connecting column can move along the long hole track; The portion of the side wing extending out of the long hole track is in abutment contact with the clutch ring.

4. The clutch according to claim 2, characterized in that: The said stopping mechanism also includes: A handle, fixed on the connecting column; The stopper is sleeved on the connecting column and contacts with the first connecting ring; The handle adjusts the distance between itself and the first connecting ring under the action of external force, thereby driving the connecting column to move along the long hole track; The stopper is used to lock the handle so that the distance between the handle and the first connecting ring is fixed.

5. The clutch according to claim 4, characterized in that: The stopper is fixed on the first connecting ring to prevent the stopper from rotating in the circumferential direction relative to the first connecting ring; The stopper is provided with a guide track along the circumferential direction, and the handle is provided with a guide portion matched with the guide track; The handle can rotate in the circumferential direction under the action of an external force. When the handle rotates, the guide portion pushes the handle away from or close to the stopper under the guidance of the guide track.

6. The clutch according to claim 5, characterized in that: The guide track includes raised portions that are periodically repeated along the circumferential direction. The shape of the guide portion at least partially matches the guide rail, so that when the raised portion of the guide rail and the raised portion of the guide portion are opposite, the handle is moved away from the stopper, and when the non-raised portion of the guide rail and the raised portion of the guide portion are opposite, the handle is moved closer to the stopper; A locking recess is provided on the protruding portion of at least one of the guide portion and the guide rail, and the locking recess is used for the protruding portion of the other to be locked in, so as to lock the handle at a position away from the stopper.

7. The clutch according to claim 6, characterized in that: The raised portion of the guide track has a smooth curved profile, and one side thereof is relatively gentle in the circumferential direction, and the other side is relatively steep; The locking recess is located at a position of the convex portion of the guide portion adjacent to a steeper side of the guide track.

8. The clutch according to any one of claims 1 to 7, characterized in that: The clutch ring comprises: A bottom plate, on which a plurality of clamping parts are arranged; The first connecting ring is provided with the same number of clamped parts in one-to-one correspondence, and when the clutch ring abuts against the first connecting ring, the clamping parts are clamped with the clamped parts.

9. The clutch according to claim 8, characterized in that: The clutch ring also includes: A side plate, the side plate is arranged around the outer periphery of the bottom plate, and the side plate protrudes toward the direction where the first connecting ring is located; The thickness of the first connecting ring is smaller than the height of the side plate, and the outer diameter of the first connecting ring is smaller than the diameter of the circle enclosed by the inner wall of the side plate.

10. A wheel module, characterized in that: The invention comprises a wheel and a clutch as claimed in any one of claims 1 to 9.

11. A medical trolley, characterized in that: include: A vehicle body, wheels, and a power device arranged on the vehicle body; The power device and the wheels are connected via a clutch as described in any one of claims 1 to 9.

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