Lifting and adjusting device and trolley

Abstract

The present application provides a lifting and adjusting device and a trolley, comprising a driving unit, a stepping unit, a connecting rod unit, and a lifting body disposed on a base and movable in a direction away from or toward the base; when the lifting body is located close to the base, the base is supported by the supporting body; when the lifting body is located away from the base, the base is supported by the lifting body; the driving unit comprises a driving portion and an output shaft; the stepping unit comprises a lead screw and a lead screw follower connected to the output shaft; the connecting rod unit is respectively connected to the lead screw follower and the caster; when the driving portion moves in a driving direction, the driving output shaft drives the lead screw to rotate in a positive direction and pushes the lead screw follower to translate a corresponding step length, and the lead screw follower drives the lifting body to move a corresponding distance in a direction away from the base via the connecting rod unit; when the driving portion resets in the opposite direction, the driving portion does not drive the output shaft. Accordingly, the trolley is switched between a stationary state and a moving state by alternately supporting the lifting body and the supporting body.

Description

Technical Field

[0001] The present application relates to a lifting and adjusting device and a trolley which can be conveniently switched between a moving state and a stable stationary state. Background Art

[0002] With technological advancements, the use of robots to assist doctors in surgery is gaining increasing popularity. Surgical robots are generally heavy, so for safety and ease of transport, they are mounted on a dedicated trolley with casters at the four corners. These casters are designed to meet hospital requirements for lightweight operation, flexible steering, high elasticity, ultra-quiet operation, wear resistance, entanglement resistance, and chemical corrosion resistance.

[0003] While casters facilitate the movement of the trolley, they also make its placement unstable. Furthermore, many casters are made of non-metallic materials for quietness, which can lead to significant deformation when bearing heavy objects. During surgery, to ensure the robot's precise movements, the trolley must not move or shake, placing high demands on its stability.

[0004] Traditionally, support legs and casters coexist and alternate to ensure the trolley's mobility and stability when stationary. When supported by the support legs, the trolley remains stable, facilitating surgical operations; when supported by the casters, the trolley is mobile.

[0005] However, when switching the trolley between moving and stationary states, manual adjustment is generally required to extend and retract the support legs or casters, and each support leg or caster is usually adjusted individually, and it is impossible to ensure that the height extension and retraction of each support leg or caster is consistent, resulting in instability when the trolley is moving or supporting, and it also takes a lot of time to adjust, making the operation time-consuming and labor-intensive.

[0006] Therefore, in the prior art, conveniently switching the trolley between a moving state and a stable stationary state is a technical issue. Summary of the Invention

[0007] The purpose of the present application is to provide a lifting and adjusting device and a trolley that can be easily switched between a mobile state and a stable static state. In order to achieve the above purpose, one scheme of the present application is a lifting and adjusting device, which includes a driving unit, a stepping unit, a connecting rod unit and a lifting body arranged on a base body and movable in a direction away from / close to the base body; when the lifting body is located close to the base body, the base body is supported by a supporting body, wherein the supporting body and the lifting body are arranged on the same side of the base body; when the lifting body is located away from the base body, the base body is supported by the lifting body; the driving unit includes a driving part and an output shaft; the stepping unit includes a screw connected to the output shaft and rotating synchronously with the output shaft , and a screw follower that is matched with the screw and translates along the extension direction of the screw as the screw rotates; the connecting rod unit is respectively connected to the screw follower and the lifting body; when the driving part moves along the driving direction, the output shaft is driven to drive the screw to rotate forward and push the screw follower to translate a step length corresponding to the stroke of the driving part, and the screw follower drives the lifting body to move away from the base by a distance corresponding to the step length via the connecting rod unit; when the driving part is reset in the opposite direction of the driving direction, the driving part does not drive the output shaft.

[0008] According to the above technical solution, the lifting height of the lifting body relative to the base can be adjusted by controlling the driving part, thereby realizing alternating support of the supporting body and the lifting body, and conveniently realizing the switching of the trolley between the static state and the moving state.

[0009] In a preferred embodiment, it includes a clutch assembly, which includes a first clutch component connected to the screw and a second clutch component connected to the output shaft; when the clutch assembly enters a transmission state, the first clutch component and the second clutch component engage, and the output shaft drives the screw to rotate; when the clutch assembly enters a separation state, the first clutch component and the second clutch component disengage, so that the transmission between the output shaft and the screw is disconnected.

[0010] In a preferred embodiment, when the clutch assembly enters a disengaged state, at least under the action of the gravity of the base, the lifting body applies a force to the screw follower via the connecting rod unit to cause the screw to move horizontally along the extension direction of the screw. This force drives the screw to rotate in the opposite direction, causing the base to move toward the lifting body.

[0011] According to the aforementioned technical solution, a clutch assembly is provided to realize transmission or disconnection between the output shaft and the lead screw, and since the lead screw and the lead screw follower are not self-locking, when the clutch assembly is disconnected, the base pushes the lead screw to rotate in the opposite direction and the lead screw follower to move in the opposite direction under the action of gravity, thereby causing the base to move toward the direction close to the lifting body, and finally causing the support body to contact the ground and support it.

[0012] and a plurality of clutch members connected to the first clutch member and the second clutch member, wherein the plurality of clutch members are engaged with each other and the plurality of clutch members are engaged with each other, wherein the plurality of clutch members are engaged with each other and the plurality of clutch members are engaged with each other.

[0013] According to the above technical solution, the clutch lever can conveniently separate the first clutch member and the second clutch member, and when the clutch lever is not working, the elastic force of the clutch elastic component automatically engages the first clutch member and the second clutch member.

[0014] In a preferred embodiment, the present invention comprises a cam rotatable around a camshaft, wherein the camshaft is arranged on the base in a manner intersecting with the extension direction of the output shaft; and a clutch driving portion connected to the camshaft is further provided. When the clutch driving portion moves in a direction causing the clutch lever to enter a working state, the clutch driving portion drives the cam to rotate via the camshaft, so that the flange of the cam abuts against the clutch lever, and pushes the clutch lever to drive the first clutch member and the second clutch member, whichever is connected to the clutch lever, to move in a direction away from the other.

[0015] According to the above technical solution, a person can operate the clutch driving unit to separate the first clutch member and the second clutch member via the cam and the clutch lever, which has a simple structure and is easy to operate.

[0016] In a preferred embodiment, the drive unit includes a first overrunning clutch and a second overrunning clutch; the first overrunning clutch includes an input shaft and a first outer ring sleeved on the input shaft and fixedly connected to the drive part; the second overrunning clutch includes the output shaft and a second outer ring sleeved on the output shaft; the input shaft and the output shaft are respectively connected to a driving gear and a driven gear that are meshed with each other; when the drive part moves along the driving direction, the first outer ring and the input shaft rotate synchronously with the drive part at a first angle corresponding to the stroke of the drive part, and drive the driven gear through the driving gear and then drive the output shaft to rotate forward at a second angle corresponding to the stroke of the drive part; when the drive part is reset in the opposite direction of the driving direction, the first outer ring is reset synchronously with the drive part, and the drive part does not drive the input shaft and the output shaft.

[0017] According to the above technical solution, two overrunning clutches are provided, one of which is responsible for driving and resetting the driving part, and the output shaft of the other one rotates synchronously with the input shaft.

[0018] In a preferred embodiment, the second outer ring is fixed to the base body, and when the output shaft is subjected to a reverse rotation force exerted by the lead screw, the output shaft is limited by the second outer ring to achieve reverse braking.

[0019] According to the above technical solution, since the second outer ring is fixed to the base, the output shaft can overcome the reverse rotation force applied by the screw, making the state of the trolley more stable.

[0020] In a preferred embodiment, the transmission ratio between the driving gear and the driven gear is greater than 1.

[0021] According to the aforementioned technical solution, when the transmission ratio is greater than 1, the two gears are equivalent to a labor-saving lever, which can save more effort when operating the driving part, and can also make the output shaft rotate a larger angle under a specific movement stroke of the driving part.

[0022] In a preferred embodiment, the driving unit further includes a driving elastic component connected to the driving part. When the driving part moves along the driving direction, the driving elastic component applies a force opposite to the driving direction to the driving part to push the driving part to reset.

[0023] According to the aforementioned technical solution, the driving unit includes a ratchet that is coaxially arranged with the output shaft and rotates synchronously, and a driving pawl that is clamped to the ratchet and fixedly connected to the driving part; when the driving part moves along the driving direction, the driving pawl is inserted into the tooth groove of the ratchet and drives the ratchet to drive the output shaft to rotate forwardly by a first angle corresponding to the stroke of the driving part; when the driving part is reset in the opposite direction of the driving direction, the driving pawl slides over the back of the teeth of the ratchet, and the driving part does not drive the ratchet.

[0024] According to the aforementioned technical solution, the ratchet can also achieve the effect of unidirectional driving of the output shaft. When the driving part moves along the driving direction, it drives the ratchet to rotate, and when the driving part is reset, it does not drive the ratchet.

[0025] In a preferred embodiment, the drive unit further includes a stop pawl engaged with the ratchet, and the stop pawl is rotatably connected to the base through a pawl shaft; when the driving part moves along the driving direction, the stop pawl slides over the back of the teeth of the ratchet; and when the output shaft is subjected to the reverse rotation force applied by the screw, the stop pawl is inserted into the tooth groove of the ratchet, thereby realizing reverse braking of the ratchet.

[0026] According to the aforementioned technical solution, the stopping pawl can achieve a reverse braking effect on the ratchet and the output shaft.

[0027] In addition, another aspect of the present application is a trolley comprising a base for carrying equipment and the above-mentioned lifting and adjusting device; wherein the lifting body and the supporting body are respectively one and the other of the supporting legs and the first caster arranged on the same side relative to the base.

[0028] In a preferred embodiment, the first caster is used as the lifting body; the trolley also includes a second caster and a third caster that can be moved in a direction away from / closer to the base, and the second caster, the third caster and the first caster are arranged on the same side of the base; wherein the first caster is connected to the front caster connector, and the second caster and the third caster are commonly connected to the rear caster connector; the connecting rod unit includes a connecting rod assembly and a front hinge assembly and a rear hinge assembly; the connecting rod assembly is respectively connected to the screw follower and the front hinge assembly and the rear hinge assembly, and the front hinge assembly and the rear hinge assembly are respectively connected to the front caster connector and the rear caster connector; when the screw As the output shaft rotates forward, the screw follower drives the front hinge assembly and the rear hinge assembly into an open state via the connecting rod assembly, and then pushes the first caster, the second caster, and the third caster to move away from the base via the front caster connector and the rear caster connector; when the clutch assembly enters a separated state, at least under the action of the gravity of the trolley, the front hinge assembly and the rear hinge assembly enter a folded state, and apply a force to the screw follower to move in a translational direction along the extension direction of the screw via the connecting rod assembly, and this force drives the screw to rotate in the opposite direction, so that the base moves toward the first caster, the second caster, and the third caster.

[0029] According to the aforementioned technical solution, by providing a connecting rod assembly and the front and rear hinge assemblies, the trolley can be easily switched between a stationary state and a mobile state. Furthermore, by synchronously adjusting the front and rear caster connectors through the connecting rod assembly, the height of each caster relative to the base can be synchronously adjusted, reducing the trouble of adjusting and aligning the casters one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the present application, the accompanying drawings are described and illustrated below. It is apparent that the drawings described below only illustrate certain aspects of some exemplary embodiments of the present application, and it is readily apparent to those skilled in the art that other drawings can be derived from these drawings without inventive effort.

[0031] Figure 1 It is a schematic diagram of the overall structure of the trolley.

[0032] Figure 2 This is a schematic diagram of the bottom of the trolley.

[0033] Figure 3 It is a side view of an exemplary trolley.

[0034] Figure 4is a schematic structural diagram of an exemplary drive unit.

[0035] Figure 5 It is a horizontal cross-sectional view of an exemplary drive unit.

[0036] Figure 6 Schematic diagram of the structure of an exemplary overrunning clutch.

[0037] Figure 7 Schematic diagram of the structure of an exemplary ratchet.

[0038] Figure 8 It is a schematic diagram of the structure of the stepping unit and the connecting rod unit.

[0039] Figure 9 Schematic diagram of the structure of the clutch assembly.

[0040] Caption of the accompanying drawings:

[0041] 100 matrix

[0042] 1041 First Support Leg

[0043] 1042 Second Support Leg

[0044] 1043 Third Support Leg

[0045] 105 First Caster

[0046] 1051 First caster shaft

[0047] 1052 First caster elastic component

[0048] 1053 First caster seat

[0049] 1054 front caster connector

[0050] 1055 rear caster connector

[0051] 106 Second caster

[0052] 107 Third caster

[0053] 108 Fourth caster

[0054] 1 driver unit

[0055] 10. Drive unit

[0056] 11 First overrunning clutch

[0057] 111 Input shaft

[0058] 112 First Outer Ring Road

[0059] 113 driving gear

[0060] 114 Input shaft bearing

[0061] 115 Input shaft bearing

[0062] 116 driving elastic component

[0063] 117 First Inner Ring

[0064] 118 Wedge

[0065] 1171 keyway

[0066] 12 Second overrunning clutch

[0067] 121 Output shaft

[0068] 122 Second Outer Ring Road

[0069] 123 driven gear

[0070] 124 output shaft bearing

[0071] 125 output shaft bearing

[0072] 2 stepper units

[0073] 20 Clutch drive unit

[0074] 21 Screw

[0075] 211 Screw bearing

[0076] 212 Screw bearing

[0077] 22 Screw follower

[0078] 221 Screw connecting rod connection

[0079] 23 driven shaft

[0080] 231 Driven shaft protrusion

[0081] 24 Clutch assembly

[0082] 241 First clutch

[0083] 242 Second clutch

[0084] 243 Clutch elastic component

[0085] 25 Clutch lever

[0086] 251 lever shaft

[0087] 252 lever holder

[0088] 253 lever elastic component

[0089] 254 Cam

[0090] 255 camshaft

[0091] 256 cam bearing

[0092] 257 Cam bearing

[0093] 3-link unit

[0094] 51 Ratchet

[0095] 511 tooth groove

[0096] 512 tooth back

[0097] 52 drive pawl

[0098] 53 Stop pawl

[0099] 531 pawl shaft

[0100] 54 ratchet frame

[0101] 71 connecting rod assembly

[0102] 711 first connecting rod

[0103] 7110 Spherical Ball Bearings

[0104] 712 Second connecting rod

[0105] 713 Third Link

[0106] 714 Fourth Link

[0107] 7140 Spherical Ball Bearing

[0108] 715 Fifth Link

[0109] 72 front hinge assembly

[0110] 721 First front hinge rod

[0111] 722 Second front hinge rod

[0112] 723 First front hinge seat

[0113] 724 Second front hinge seat

[0114] 73 Rear hinge assembly

[0115] 731 First rear hinge rod

[0116] 732 Second rear hinge rod

[0117] 733 First rear hinge seat

[0118] 734 Second rear hinge seat DETAILED DESCRIPTION

[0119] Various exemplary embodiments of the present application are described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present application and its application or use. The present application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present application thorough and complete and to fully convey the scope of the present application to those skilled in the art. It should be noted that unless otherwise stated, the relative arrangement of the components and steps, numerical expressions, numerical values, etc. described in these embodiments should be interpreted as merely exemplary and not as limiting.

[0120] The words “include” or “comprising” and similar words used in this application mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements.

[0121] All terms (including technical or scientific terms) used in this application have the same meaning as those understood by ordinary technicians in the field to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined in this article.

[0122] Components, parameters such as specific models of components, relationships between components, and control circuits that are not described in detail in this section may be considered to be technologies, methods, and equipment known to ordinary technicians in the relevant fields, but where appropriate, such technologies, methods, and equipment should be considered as part of the specification.

[0123] Overall structure

[0124] The following reference Figure 1-3 The overall structure of the trolley of the present application will be described. Figure 1 This is a schematic diagram of the overall structure of the trolley. Figure 2 This is a schematic diagram of the bottom of the trolley. Figure 3 It is the side view of the trolley.

[0125] See Figure 1 As a preferred solution, the trolley includes a base 100 for carrying equipment, and a first support leg 1041, a second support leg 1042, a third support leg 1043 arranged on the same side relative to the base 100 and fixedly connected to the base 100, and a first caster 105, a second caster 106, a third caster 107, and a fourth caster 108 that can move away from / approaching the base 100.

[0126] For example, the base 100 is generally a flat-plate trolley base. For ease of description, the base 100 is set horizontally, with the side where the support legs and casters are installed being the lower side, and the side opposite to the lower side for placing equipment being the upper side.

[0127] The number of support legs and casters is not specifically limited here. The support leg can be one or more, but the casters are generally at least three to provide stable support during the movement of the trolley. For the sake of simplicity, this application only uses the first caster 105, the second caster 106, the third caster 107, the fourth caster 108 and the first support leg 1041, the second support leg 1042, and the third support leg 1043 as examples. The support legs can be cylindrical as shown in the figure, or they can be other styles that are conducive to stable support, which will not be described in detail here.

[0128] As shown in the figure, the first caster 105 is fixed to the first caster shaft 1051, and the first caster shaft 1051 is arranged to pass through the base 100 from bottom to top. The first caster shaft 1051 can move up and down relative to the base 100, so that the first caster 105 can move toward / away from the base 100 in the up and down direction.

[0129] Preferably, the second caster 106, the third caster 107, and the fourth caster 108 are arranged in the same manner as the first caster 105. It should be noted that the number of liftable casters can be set as needed, for example, only one liftable first caster 105 can be provided as a lift body, or more liftable casters can be provided as lift bodies. For simplicity, this application only uses the example of the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 all being able to move up and down in a direction toward / away from the base 100.

[0130] In this embodiment, when the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 are located at the upper position close to the base 100, the base 100 is supported by the first support leg 1041, the second support leg 1042, and the third support leg 1043; when the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 are located at the lower position away from the base 100, the base 100 is supported by the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108.

[0131] In other words, the first support leg 1041, the second support leg 1042, and the third support leg 1043 serve as support bodies, and the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 serve as lifting bodies that can move up and down relative to the base 100, so that the first support leg 1041, the second support leg 1042, and the third support leg 1043 are on the ground or suspended in the air, thereby realizing that the support body and the lifting body alternately support the base 100.

[0132] It is understood that at least a portion of the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 can also be used as a support body fixedly connected to the base 100, and at least one of the first support leg 1041, the second support leg 1042, and the third support leg 1043 can be configured as a lifting body that can move up and down toward or away from the base 100. By adjusting the up and down movement distance of the lifting body, alternating support between the support body and the lifting body is achieved. When the support legs serve as the lifting body, the number is not limited to the three described above. As needed, one support leg, such as the first support leg 1041, can be configured as a lifting body, or more support legs, such as two, three, or four, can be configured as lifting bodies. This will not be described in detail here.

[0133] Continue to read Figure 1 The trolley further includes a driving unit 1, a stepping unit 2 and a connecting rod unit 3 provided on the base 100. Preferably, the driving unit 1 and the stepping unit 2 are provided on the upper side of the base 100 for easy manpower control.

[0134] See Figure 1 、 Figure 3 The drive unit 1 includes a drive portion 10 and an output shaft 121. The stepper unit 2 includes a lead screw 21 connected to the output shaft 121 and rotating synchronously with the output shaft 121, and the output shaft 121 and the lead screw 21 are coaxially arranged; and a lead screw driven portion 22 that is matched with the lead screw 21 and translates along the extension direction of the lead screw 21 as the lead screw 21 rotates.

[0135] For ease of explanation, in the horizontal direction, the direction from the drive unit 1 toward the stepping unit 2 is considered front, and the opposite direction is considered rear. That is, the stepping unit 2 is located above and in the front of the base 100, and the drive unit 1 is located above and in the rear of the base 100. Furthermore, the direction extending from the output shaft 121 and the lead screw 21 is considered the axial direction, and the horizontal direction perpendicular to the axial direction is considered the transverse direction. Therefore, the axial direction is the front-to-back direction.

[0136] In addition, in this embodiment, from a perspective viewed from the back to the front, the clockwise rotation direction of the output shaft 121 and the lead screw 21 is the forward direction, and the counterclockwise rotation direction is the reverse direction.

[0137] Continue to read Figure 3The connecting rod unit 3 is respectively connected to the screw follower 22 and the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108. When the driving unit 10 moves in the driving direction, the drive output shaft 121 drives the screw 21 to rotate in the forward direction and pushes the screw follower 22 to translate a step length corresponding to the stroke of the driving unit 10. The screw follower 22 drives the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 to move away from the base 100, i.e., downward, a distance corresponding to the step length, through the connecting rod unit 3. When the driving unit 10 is reset in the direction opposite to the above-mentioned driving direction, the driving unit 10 does not drive the output shaft 121, that is, the output shaft 121 does not rotate.

[0138] When the screw 21 rotates in the forward direction, the screw follower 22 can translate forward or backward. For the sake of convenience, it is assumed that the screw follower 22 translates forward. When the screw 21 rotates in the reverse direction, the screw follower 22 translates backward.

[0139] Preferably, the driving unit 10 is a pedal. When the output shaft 121 needs to be driven, the driving unit 10 can be stepped on manually. The driving direction mentioned above is the direction of downward movement of the driving unit 10. In fact, the driving unit 10 can also be another type of driving mechanism, such as a manual rocker, as long as it can provide power for the output shaft 121 to rotate in the positive direction.

[0140] The trolley of this embodiment adopts the coexistence and alternating support of the first supporting leg 1041, the second supporting leg 1042, the third supporting leg 1043 and the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 to ensure the mobility of the trolley and the stability when stationary. The driving unit 1, the stepping unit 2 and the connecting rod unit 3 are driven by manpower to move the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 away from / closer to the base 100, thereby realizing the alternating support of the supporting legs and the casters, thereby realizing the switching of the trolley between the stationary state and the mobile state. The structure is simple and the operation is convenient.

[0141] drive unit

[0142] The following combination Figure 4-7 The drive unit 1 will be described in detail. Figure 4 is a schematic structural diagram of the drive unit 1, Figure 5 is a horizontal cross-sectional view of the drive unit 1, Figure 6 This is a schematic diagram of the structure of the overrunning clutch. Figure 7 Schematic diagram of the structure of the ratchet 51.

[0143] First, the first embodiment is described.

[0144] As a first embodiment, see Figure 4 、 Figure 5 The drive unit 1 includes a first overrunning clutch 11 and a second overrunning clutch 12. The first overrunning clutch 11 includes an input shaft 111 and a first outer ring 112 sleeved on the input shaft 111 and fixedly connected to the drive unit 10. The second overrunning clutch 12 includes an output shaft 121 and a second outer ring 122 sleeved on the output shaft 121. The input shaft 111 and the output shaft 121 are fixed to the base 100 via input shaft bearings 114 and 115, and output shaft bearings 124 and 125, respectively.

[0145] Preferably, the input shaft 111 is connected to a driving gear 113 coaxial therewith, and the output shaft 121 is connected to a driven gear 123 coaxial therewith, and the driving gear 113 and the driven gear 123 are meshed with each other.

[0146] When the driving part 10 moves from top to bottom along the driving direction, the first outer ring 112 and the input shaft 111 rotate synchronously with the driving part 10 at a first angle corresponding to the stroke of the driving part 10, and drive the driven gear 123 through the driving gear 113 and then drive the output shaft 121 to rotate forward at a second angle corresponding to the stroke of the driving part 10.

[0147] When the driving part 10 is reset from bottom to top in the opposite direction of the driving direction, the first outer ring 112 is reset synchronously with the driving part 10 , but the driving part 10 does not drive the input shaft 111 , nor does it drive the output shaft 121 .

[0148] Preferably, the second outer ring 122 is fixed to the base 100. When the output shaft 121 is subjected to the reverse rotation force applied by the screw 21, the output shaft 121 is limited by the second outer ring 122 and cannot rotate reversely, thereby achieving reverse braking of the output shaft 121.

[0149] Preferably, the transmission ratio of the driving gear 113 to the driven gear 123 is greater than 1, that is, the number of teeth of the driving gear 113 is greater than the number of teeth of the driven gear 123. The cooperation of these two gears is equivalent to a labor-saving lever, which makes it easier to step on the driving unit 10 and enables the driving unit 10 to drive the output shaft 121 to rotate a larger second angle in one stroke along the driving direction. Of course, the transmission ratio of the driving gear 113 to the driven gear 123 can also be less than 1, which is suitable for heavier trolleys. We will not elaborate on this here.

[0150] Further preferably, the drive unit 1 further includes a drive elastic member 116 connected to the drive unit 10. When the drive unit 10 moves downward from top to bottom along the drive direction, the drive elastic member 116 applies a force to the drive unit 10 opposite to the drive direction, thereby pushing the drive unit 10 upward to reset. Exemplarily, the drive elastic member 116 is a torsion spring sleeved on the input shaft 111.

[0151] The principle of the overrunning clutch is explained below.

[0152] See Figure 6 Taking the first overrunning clutch 11 as an example, it includes an input shaft 111, a first inner ring 117 sleeved on the input shaft 111, and a first outer ring 112 sleeved radially outward of the first inner ring 117. The first outer ring 112, the first inner ring 117, and the input shaft 111 are coaxially arranged. A plurality of wedges 118 are disposed between the first outer ring 112 and the first inner ring 117. A keyway 1171 is also provided on the radially inner surface of the first inner ring 117 for engaging with a protrusion on the radial outer surface of the input shaft 111. This will not be described in detail here.

[0153] When the first outer ring 112 rotates along with the driving unit 10 in the driving direction, for example, counterclockwise from the perspective of the figure, the wedge 118 locks in the fixed groove between the first outer ring 112 and the first inner ring 117, thereby driving the input shaft 111 to rotate counterclockwise via the first inner ring 117. Conversely, when the first outer ring 112 rotates in the opposite direction, that is, clockwise, the wedge 118 disengages from the fixed groove between the first outer ring 112 and the first inner ring 117. The first outer ring 112 cannot drive the first inner ring 117 via the wedge 118, and thus cannot drive the input shaft 111 to rotate. In other words, the first outer ring 112 is in an idling state.

[0154] Preferably, the structural principle of the second overrunning clutch 12 is the same as that of the first overrunning clutch 11. It is understood that the two overrunning clutches can also be different styles such as roller overrunning clutches and ratchet overrunning clutches, and are not limited to wedge types, which will not be described in detail here.

[0155] Next, the second embodiment is described.

[0156] As a second embodiment, see Figure 7 The driving unit 1 includes a ratchet 51 coaxially arranged with the output shaft 121 and rotating synchronously, and a driving pawl 52 engaged with the ratchet 51 and fixedly connected to the driving part 10 .

[0157] When the driving part 10 moves along the driving direction, the driving pawl 52 is inserted into the tooth groove 511 of the ratchet 51, and drives the ratchet 51 to drive the output shaft 121 to rotate in the counterclockwise direction shown in the figure by a first angle corresponding to the stroke of the driving part 10; when the driving part 10 is reset in the opposite direction of the driving direction, the driving pawl 52 slides over the tooth back 512 of the ratchet 51, and the ratchet 51 does not move.

[0158] Preferably, the drive unit 1 further includes a stop pawl 53 engaged with the ratchet 51. The stop pawl 53 is rotatably connected to a ratchet frame 54 fixed to the base 100 via a pawl shaft 531. Furthermore, a pawl elastic member (not shown) is provided on the pawl shaft 531. The pawl elastic member can be a spring, a leaf spring, or other forms, and is used to apply a counterclockwise rotational force to the stop pawl 53 so that it is tightly attached to the radially outer side of the ratchet 51.

[0159] When the driving part 10 moves in the driving direction, the stopping pawl 53 slides over the tooth back 512 of the ratchet 51; and when the ratchet 51 or the output shaft 121 is subjected to a force rotating in the clockwise direction as shown in the figure, the stopping pawl 53 is inserted into the tooth groove 511 of the ratchet 51, thereby braking the ratchet 51.

[0160] While the structures of the first and second embodiments are different, their principles are similar. Both embodiments achieve the following effects: the output shaft 121 is driven to rotate by the drive unit 10, and the output shaft 121 does not rotate when the drive unit 10 is reset. Furthermore, the output shaft 121 is braked when subjected to a force acting in the opposite direction. For simplicity, this application will only use the first overrunning clutch 11 and the second overrunning clutch 12 of the first embodiment as an example for explanation.

[0161] stepper unit

[0162] The following combination Figure 8-9 The stepping unit 2 will be described in detail. Figure 8 This is a schematic diagram of the structure of the stepping unit 2 and the connecting rod unit 3. Figure 9 2 is a schematic structural diagram of the clutch assembly 24.

[0163] See Figure 8 The screw 21 is mounted on the base 100 by being fixed to the screw bearing 211 and the screw bearing 212 at the front and back, respectively. In a common example, the screw follower 22 and the screw 21 are threaded together, and the screw follower 22 is a nut member sleeved on the screw 21, which can be converted into linear motion according to the lead of the corresponding specification as the screw 21 rotates at an angle. The lead here refers to the linear distance that the nut on the screw 21 moves axially when it rotates one circle, which is generally 5mm, 10mm, 20mm, etc. That is, when the screw 21 rotates a certain angle, the screw follower 22 translates the corresponding linear distance along the axial direction.

[0164] Preferably, the lead screw 21 is connected to the output shaft 121 via a clutch assembly 24. Figure 9The clutch assembly 24 includes a first clutch member 241 and a second clutch member 242. The first clutch member 241 is connected to the rear end of the screw 21 facing the output shaft 121, and the second clutch member 242 is connected to the front end of the driven shaft 23 facing the screw 21, wherein the rear end of the driven shaft 23 is connected to the output shaft 121 and is coaxially arranged therewith.

[0165] When the clutch assembly 24 enters the transmission state, the first clutch member 241 and the second clutch member 242 engage with each other, and the output shaft 121 drives the lead screw 21 to rotate via the driven shaft 23 and the clutch assembly 24. When the clutch assembly 24 enters the disengagement state, the first clutch member 241 and the second clutch member 242 disengage, disconnecting the transmission between the output shaft 121 and the lead screw 21.

[0166] Preferably, the clutch further includes a clutch lever 25 and a clutch elastic component 243 connected to one of the first clutch member 241 and the second clutch member 242. For example, the clutch lever 25 is connected to the second clutch member 242. The clutch elastic component 243 is sleeved on the driven shaft 23 and connected between the second clutch member 242 and the driven shaft protrusion 231. It has an axially compressed deformation tolerance and is used to apply a force that causes the first clutch member 241 and the second clutch member 242 to engage with each other. The clutch elastic component 243 is typically a spring.

[0167] When the clutch lever 25 enters the working state, that is, moves toward the rear away from the screw 21, the clutch lever 25 is subjected to an axial force opposite to the force applied by the clutch elastic component 243. Driven by the clutch lever 25, the second clutch component 242 resists the force applied by the clutch elastic component 243 and moves toward the rear away from the first clutch component 241. The clutch assembly 24 enters the disengaged state. At this time, the output shaft 121 no longer drives the screw 21.

[0168] When the clutch lever 25 is in the non-operating state, that is, when the clutch lever 25 moves forward to reset, the second clutch member 242 moves forward close to the first clutch member 241 under the force of the clutch elastic component 243, and the clutch assembly 24 engages and enters the transmission state.

[0169] It should be noted that when the front end of the second clutch member 242 moves forward and abuts the rear end of the first clutch member 241, the first clutch member 241 and the second clutch member 242 may not be in an engaged state. For example, the teeth on the end faces of the two clutch members are not staggered and engaged with each other. In this case, the clutch assembly 24 is still in a disengaged state. However, when the output shaft 121 drives the second clutch member 242 to rotate via the driven shaft 23, the second clutch member 242 continues to rotate and move forward under the elastic force of the clutch elastic member 243, causing the teeth on its front end to stagger with the teeth on the rear end of the first clutch member 241 and enter an engaged state. At this time, the output shaft 121 drives the lead screw 21 to rotate.

[0170] In other words, under the force of the clutch elastic component 243, the second clutch member 242 can automatically engage with the first clutch member 241, avoiding the trouble of manual adjustment of the clutch assembly 24 and improving work efficiency.

[0171] Next, the operation of the clutch lever 25 will be described.

[0172] Preferably, the clutch lever 25 is elongated as shown, and is arranged perpendicular to the extension direction, i.e., the axial direction, of the output shaft 121. The end of the clutch lever 25, distal from the second clutch member 242, is rotatably connected to a lever frame 252 via a lever shaft 251. The lever frame 252 is fixed to the base 100. Preferably, a lever elastic member 253 is sleeved on the lever shaft 251. The lever elastic member 253 is typically a spring that applies a forward force to the clutch lever 25, facilitating its return.

[0173] The stepping unit 2 further includes a cam 254 rotatable around a cam shaft 255 . The cam shaft 255 is fixed to the base 100 via cam bearings 256 and 257 , and is arranged to intersect the axial direction. Preferably, the cam shaft 255 is perpendicular to the output shaft 121 .

[0174] A clutch drive unit 20 is also provided, connected to a camshaft 255. Exemplarily, the clutch drive unit 20 is a pedal, but it can also be a manual rocker or other similar configuration, without specific limitation. As shown in the figure, when the clutch drive unit 20 is stepped on forward, the clutch drive unit 20 drives the cam 254 to rotate via the camshaft 255, causing the flange of the cam 254 to move upward and abut against the clutch lever 25. This pushes the clutch lever 25, driving the second clutch member 242 rearward, and the clutch assembly 24 enters a disengaged state.

[0175] When the clutch assembly 24 needs to enter the transmission state, the clutch driving part 20 is stepped on backward, and the camshaft 255 drives the flange of the cam 254 to move downward to the bottom of the clutch lever 25. At this time, the clutch lever 25 moves forward under the action of the lever elastic component 253, and the second clutch component 242 also moves forward under the elastic force of the clutch elastic component 243, and finally engages with the first clutch component 241.

[0176] connecting rod unit

[0177] The following combination Figure 1 、 Figure 8 The link unit 3 will be described in detail.

[0178] See Figure 1The first caster 105 is rotatably connected to the first caster seat 1053, and the first caster seat 1053 is fixedly connected to the first caster shaft 1051 and can move up and down along with the first caster shaft 1051. The second caster 106, the third caster 107, and the fourth caster 108 are arranged in the same manner as the first caster 105 and will not be described here one by one.

[0179] As a preferred solution, the first caster 105 and the second caster 106 are commonly connected to the front caster connector 1054, and the third caster 107 and the fourth caster 108 are commonly connected to the rear caster connector 1055. As a result, the first caster 105 and the second caster 106 can be moved up and down relative to the base 100 under the drive of the front caster connector 1054, and the third caster 107 and the fourth caster 108 can also be moved up and down relative to the base 100 under the drive of the rear caster connector 1055.

[0180] Exemplarily, the first caster 105 and the second caster 106 are universal wheels, and the third caster 107 and the fourth caster 108 are fixed wheels to facilitate the movement and steering of the trolley.

[0181] See Figure 8 The connecting rod unit 3 includes a connecting rod assembly 71, a front hinge assembly 72, and a rear hinge assembly 73. Preferably, the connecting rod assembly 71 includes a first connecting rod 711, a second connecting rod 712, a third connecting rod 713, and a fourth connecting rod 714.

[0182] The first connecting rod 711 extends obliquely from an upper front position to a lower rear position, while the second connecting rod 712 and the third connecting rod 713 extend horizontally and perpendicularly to the axial direction. The front end of the first connecting rod 711 is connected to the screw connecting rod connecting portion 221 of the screw follower 22, and the rear end is connected to the second connecting rod 712 via a joint ball bearing 7110. The rear end of the fourth connecting rod 714 is fixed to the second connecting rod 712, and the front end is connected to the third connecting rod 713 via a joint ball bearing 7140.

[0183] Preferably, a fifth connecting rod 715 is further provided, the rear end of the fifth connecting rod 715 being fixed to the second connecting rod 712 and the front end being connected to the third connecting rod 713 via a joint ball bearing (not shown). The fifth connecting rod 715 is arranged in parallel with the fourth connecting rod 714, and has the same style and function, so no further details will be given here.

[0184] Furthermore, the front hinge assembly 72 includes a first front hinge rod 721 and a second front hinge rod 722. One end of each of the first and second front hinge rods 721 and 722 is mounted on and pivoted around the third connecting rod 713. The other end of the first front hinge rod 721 is secured to the base 100 via a first front hinge seat 723, while the other end of the second front hinge rod 722 is secured to the front caster connector 1054 via a second front hinge seat 724.

[0185] Similarly, the rear hinge assembly 73 includes a first rear hinge rod 731 and a second rear hinge rod 732. One end of each of the first and second rear hinge rods 731 and 732 is mounted on the second connecting rod 712 and is rotatable about the second connecting rod 712. The other end of the first rear hinge rod 731 is fixed to the base 100 via a first rear hinge seat 733, and the other end of the second rear hinge rod 732 is fixed to the rear caster connector 1055 via a second rear hinge seat 734.

[0186] Preferably, in the assembled state, the second connecting rod 712 and the third connecting rod 713 are respectively located at the rear of the rear hinge assembly 73 and the front hinge assembly 72, so that the rear hinge assembly 73 and the front hinge assembly 72 are both in a V-shape opening toward the front.

[0187] Next, the transition between the moving state and the stationary state of the vehicle will be described.

[0188] During use, usually when the trolley is in a stationary state, the base 100 is supported by the first support leg 1041, the second support leg 1042, and the third support leg 1043, and the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 are lifted to a position close to the base 100 as the rear hinge assembly 73 and the front hinge assembly 72 are folded, and are out of contact with the ground.

[0189] When the driving unit 10 is stepped on, the output shaft 121 is driven to rotate forward, and the screw follower 22 drives the first connecting rod 711 and the second connecting rod 712 to move forward. The second connecting rod 712 pushes the third connecting rod 713 to move forward synchronously via the fourth connecting rod 714. At this time, the clutch assembly 24 is in the transmission state.

[0190] As a result, the second connecting rod 712 and the third connecting rod 713 respectively push the rear hinge assembly 73 and the front hinge assembly 72 into an open state, that is, the second front hinge seat 724 gradually moves downward away from the first front hinge seat 723, and the second rear hinge seat 734 gradually moves downward away from the first rear hinge seat 733. The front openings of the front hinge assembly 72 and the rear hinge assembly 73 become larger and larger, thereby pushing the front caster connector 1054 and the rear caster connector 1055 to move downward away from the base 100.

[0191] As a result, the front caster connector 1054 and the rear caster connector 1055 respectively drive the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 to move downward away from the base 100. When the lower ends of the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 move to a position lower than the lower ends of the first support leg 1041, the second support leg 1042, and the third support leg 1043, the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 contact the ground and lift the base 100, so that the first support leg 1041, the second support leg 1042, and the third support leg 1043 are suspended in the air, and a person can easily push the trolley to move.

[0192] It is understood that each time the driving unit 10 moves a specific distance in the driving direction, for example, when the driving unit 10 is fully depressed to the limit of travel, the length of advance of the lead screw driven unit 22 is constant, which is determined by the lead of the lead screw 21 and the transmission ratio of the driving gear 113 and the driven gear 123. Therefore, each time the driving unit 10 moves a specific distance in the driving direction, the height to which the base 100 is raised relative to the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 is also constant.

[0193] During the movement of the trolley, the height of the base 100 from the ground can be adjusted as needed. If the threshold is too high and difficult to pass, the driver can step on the driving unit 10 or more times to move the screw follower 22 forward multiple steps, thereby driving the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 through the connecting rod unit 3 to move a greater distance away from the bottom of the base 100, that is, to raise the base 100 to a higher height, making it easier for the trolley to pass through the obstacle.

[0194] To shift the trolley from a mobile state to a stationary state, the clutch driver 20 is stepped on, causing the clutch lever 25 to move the second clutch member 242 rearward, and the clutch assembly 24 enters a disengaged state. At this point, due to the weight of the equipment carried by the trolley and the trolley's own gravity, the base 100 experiences downward pressure and tends to move downward. This pressure is transmitted through the connecting rod assembly 71 to the screw follower 22, exerting a force on the screw follower 22 to move rearward along the screw 21.

[0195] If the lead screw 21 and the lead screw follower 22 can achieve self-locking, the lead screw follower 22 will not move along the lead screw 21. However, as a preferred solution, the lead screw 21 and the lead screw follower 22 of the present application are configured as ball screws, i.e., friction-reducing balls are provided between the threads of the mating connection between the two, rendering the ball screw non-self-locking. Therefore, when the lead screw follower 22 is subjected to a force applied by the first connecting rod 711 to move backward along the lead screw 21, the lead screw follower 22 will push the lead screw 21 to rotate in the opposite direction while moving backward.

[0196] Thus, the first connecting rod 711 moves backward along with the screw follower 22 and pushes the second connecting rod 712 to move backward. The second connecting rod 712 drives the third connecting rod 713 to move backward via the fourth connecting rod 714 . Afterwards, the second connecting rod 712 and the third connecting rod 713 respectively push the rear hinge assembly 73 and the front hinge assembly 72 into a folded state, so that the front openings of the rear hinge assembly 73 and the front hinge assembly 72 become smaller, that is, the first front hinge seat 723 gradually moves downwardly close to the second front hinge seat 724, and the first rear hinge seat 733 gradually moves downwardly close to the second rear hinge seat 734. The base 100 also drives the first support leg 1041, the second support leg 1042, and the third support leg 1043 to move downward together until they contact the ground. At this time, the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 no longer support the base 100, and the trolley enters a stable static state.

[0197] In other words, when the trolley is switched from a mobile state to a stationary state, the first, second, third, and fourth casters 105, 106, 107, and 108 are lifted upward relative to the base 100 until the lower ends of the first, second, and third support legs 1041, 1042, and 1043 contact the ground. Preferably, the first, second, third, and fourth casters 105, 106, 107, and 108 are provided with caster elastic components. For example, the first caster 105 includes a first caster elastic component 1052 sleeved around the first caster shaft 1051. The first caster elastic component 1052 is typically a compressed spring that applies an upward force to the first caster shaft 1051, thereby facilitating the lifting of the first caster 105 relative to the base 100. The caster elastic components of the second caster 106 , the third caster 107 , and the fourth caster 108 are arranged in the same manner as the first caster elastic component 1052 , so that the base 100 is more easily pressed down and the trolley enters a stable static state.

[0198] In summary, the present application can conveniently adjust the lifting height of the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 serving as the lifting body relative to the base 100 through the driving unit 1, the stepping unit 2, and the connecting rod unit 3. At the same time, the lead screw 21 and the lead screw follower 22 of the stepping unit 2 are not self-locking. When the clutch assembly 24 is in a separated state, the base 100 can be pressed down by the gravity of the trolley and its supporting equipment until the first support leg 1041, the second support leg 1042, and the third support leg 1043 serving as the support body touch the ground, thereby realizing alternating support of the support body and the lifting body to the base 100, and then realizing the conversion of the trolley's static and moving states, thereby ensuring stability during surgery and convenience when moving the equipment.

[0199] The front caster connector 1054 and the rear caster connector 1055 are respectively connected to the first caster 105 and the second caster 106 on the front side, and the third caster 107 and the fourth caster 108 on the rear side. The connecting rod unit 3 synchronizes the movement of the second link 712 and the third link 713 via the fourth link 714, and then pushes the front caster connector 1054 and the rear caster connector 1055 to move up and down synchronously via the front hinge assembly 72 and the rear hinge assembly 73, thereby realizing the synchronous lifting and lowering adjustment of the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 relative to the base 100, ensuring that the four casters are always at the same height, making the base 100 in a horizontal state, increasing the stability of the support, avoiding the trouble of adjusting the height of the casters one by one, and reducing the difficulty of operation.

[0200] Furthermore, to meet the hospital's quiet requirements, the first, second, third, and fourth casters 105, 106, 107, and 108 are typically made of non-metallic materials, which can easily cause deformation when bearing heavy loads. The alternating support of the legs and casters reduces the risk of caster deformation and extends their service life.

[0201] Furthermore, for simplicity, this application describes an example in which the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 can all move up and down in a direction toward or away from the base 100. In practice, it is also possible to have portions of the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108 fixedly connected to the base 100, while the other portions are connected to the connecting rod unit 3 and can move up and down relative to the base 100.

[0202] For example, the first caster 105 and the second caster 106 are fixed to the front side of the base 100, which can be used as moving rollers and as a support body when the trolley is stationary; while the third caster 107 and the fourth caster 108 can move up and down relative to the base 100 under the action of the drive unit 1, the stepping unit 2, and the connecting rod unit 3. In this case, only one support leg is provided at the rear side of the base 100. When the third caster 107 and the fourth caster 108 are lifted relative to the base 100, the support leg falls to the ground and supports the trolley together with the first caster 105 and the second caster 106 on the front side. Of course, since the height of the support leg in the vertical direction is different from the height of the first caster 105 and the second caster 106 in the vertical direction, the base 100 and the trolley will be in a tilted state. However, the appropriate tilt will not affect the normal operation of the equipment.

[0203] For another example, when only three casters are provided, for example, only the first caster 105 on the front side and the third caster 107 and the fourth caster 108 on the rear side, the first caster 105 can be provided as a lifting body that can be raised and lowered relative to the base 100, and the base 100 can be tilted and kept in a stationary state by adjusting the lifting distance of the first caster 105 relative to the base 100, and the third caster 107 and the fourth caster 108 on the rear side serve as supporting bodies; or, the first caster 105 can be used as a supporting body, and the third caster 107 and the fourth caster 108 on the rear side can be used as lifting bodies, and the base 100 can be tilted and kept in a stationary state by adjusting the lifting distance of the third caster 107 and the fourth caster 108 relative to the base 100.

[0204] Furthermore, the drive unit 1, stepping unit 2, connecting rod unit 3, and a lifting member disposed on the base 100 and movable in a direction away from or toward the base 100, such as the first caster 105, the second caster 106, the third caster 107, and the fourth caster 108, collectively constitute the lifting and adjusting device for the medical trolley of the present application. It should be noted that the lifting and adjusting device is not limited to being disposed on a medical trolley and can also be disposed on other similar mechanisms that require alternating support to achieve transitions between a mobile state and a stationary state. This will not be elaborated upon here.

[0205] It should be understood that the specific embodiments described above are only used to explain the present application, and the scope of protection of the present application is not limited thereto. Any technical personnel familiar with the technical field, within the technical scope disclosed in the present application, can make changes, substitutions, and combinations based on the technical solutions and inventive concepts of the present application, which should be covered by the scope of protection of the present application.

Claims

1. A lifting and adjusting device, characterized in that: The invention comprises a driving unit, a stepping unit, a connecting rod unit and a lifting body which is arranged on a base body and can move in a direction away from or close to the base body; When the lifting body is located close to the base, the base is supported by the support body, wherein the support body and the lifting body are arranged on the same side of the base; when the lifting body is located away from the base, the base is supported by the lifting body; The driving unit includes a driving portion and an output shaft; The stepping unit includes a lead screw connected to the output shaft and rotating synchronously with the output shaft, and a lead screw follower matched with the lead screw and translated along the extension direction of the lead screw as the lead screw rotates; The connecting rod unit is connected to the screw follower and the lifting body respectively; When the driving part moves in the driving direction, the output shaft is driven to drive the screw to rotate in the positive direction and push the screw follower to translate by a step length corresponding to the stroke of the driving part, and the screw follower drives the lifting body to move away from the base body by a distance corresponding to the step length via the connecting rod unit; When the driving portion is reset in the opposite direction of the driving direction, the driving portion does not drive the output shaft; A clutch assembly is provided, wherein the clutch assembly comprises a first clutch member connected to the lead screw and a second clutch member connected to the output shaft; When the clutch assembly enters a transmission state, the first clutch member and the second clutch member engage, and the output shaft drives the lead screw to rotate; When the clutch assembly enters a disengaged state, the first clutch member and the second clutch member are disengaged, so that the transmission between the output shaft and the lead screw is disconnected; When the clutch assembly enters a disengaged state, at least under the action of the gravity of the base, the lifting body applies a force to the screw follower via the connecting rod unit to translate along the extension direction of the screw, and this force drives the screw to rotate in the opposite direction, so that the base moves toward the lifting body; comprising a clutch lever and a clutch elastic component connected to one of the first clutch member and the second clutch member; The clutch elastic component has a predetermined allowable compression amount in the extension direction of the output shaft, and is used to apply a force to make the first clutch member and the second clutch member engage with each other; When the clutch lever is in an operating state, the clutch lever is subjected to a force acting in the direction of the output shaft and opposite to the force applied by the clutch elastic component. Driven by the clutch lever, the one of the first clutch component and the second clutch component connected to the clutch lever resists the force applied by the clutch elastic component and moves in a direction away from the other, and the clutch assembly enters the disengaged state. When the clutch lever is in a non-operating state, one of the first clutch member and the second clutch member connected to the clutch lever moves toward the other under the force of the clutch elastic component, and the clutch assembly enters the transmission state.

2. The lifting and adjusting device according to claim 1, characterized in that: comprising a cam rotatable about a camshaft, wherein the camshaft is arranged on the base body in a manner intersecting with an extending direction of the output shaft; A clutch driving part connected to the camshaft is also provided. When the clutch driving part moves in a direction that causes the clutch lever to enter a working state, the clutch driving part drives the cam to rotate via the camshaft, so that the flange of the cam abuts against the clutch lever, and pushes the clutch lever to drive the first clutch member and the second clutch member connected to the clutch lever to move in a direction away from the other.

3. The lifting and adjusting device according to claim 1 or 2, characterized in that: The drive unit includes a first overrunning clutch and a second overrunning clutch; The first overrunning clutch comprises an input shaft and a first outer ring sleeved on the input shaft and fixedly connected to the driving part; The second overrunning clutch comprises the output shaft and a second outer ring sleeved on the output shaft; The input shaft and the output shaft are respectively connected to a driving gear and a driven gear that mesh with each other; When the driving portion moves along the driving direction, the first outer ring and the input shaft rotate synchronously with the driving portion by a first angle corresponding to the stroke of the driving portion, and the driven gear is driven by the driving gear, thereby driving the output shaft to rotate forward by a second angle corresponding to the stroke of the driving portion; When the driving portion is reset in a direction opposite to the driving direction, the first outer ring is reset synchronously with the driving portion, and the driving portion does not drive the input shaft and the output shaft.

4. The lifting and adjusting device according to claim 3, characterized in that: The second outer ring is fixed to the base. When the output shaft is subjected to a reverse rotation force exerted by the lead screw, the output shaft is limited by the second outer ring to achieve reverse braking.

5. The lifting and adjusting device according to claim 4, characterized in that: The transmission ratio between the driving gear and the driven gear is greater than 1.

6. The lifting and adjusting device according to claim 5, characterized in that: The driving unit further includes a driving elastic component connected to the driving portion. When the driving portion moves along the driving direction, the driving elastic component applies a force opposite to the driving direction to the driving portion to push the driving portion to reset.

7. The lifting and adjusting device according to claim 1 or 2, characterized in that: The driving unit includes a ratchet wheel coaxially arranged with the output shaft and rotating synchronously, and a driving pawl engaged with the ratchet wheel and fixedly connected to the driving part; When the driving portion moves in the driving direction, the driving pawl is inserted into the tooth groove of the ratchet wheel, and drives the ratchet wheel to cause the output shaft to rotate in the positive direction by a first angle corresponding to the stroke of the driving portion; When the driving portion is reset in the opposite direction of the driving direction, the driving pawl slides over the tooth backs of the ratchet wheel, and the driving portion does not drive the ratchet wheel.

8. The lifting and adjusting device according to claim 7, characterized in that: The driving unit further comprises a stopping pawl engaged with the ratchet wheel, wherein the stopping pawl is rotatably connected to the base body via a pawl shaft; When the driving portion moves in the driving direction, the stopping pawl slides over the tooth back of the ratchet; When the output shaft is subjected to the reverse rotation force applied by the lead screw, the stop pawl is inserted into the tooth groove of the ratchet wheel to achieve reverse braking of the ratchet wheel.

9. A trolley, characterized in that: A base body for carrying equipment and a lifting and adjusting device according to any one of claims 1 to 8; The lifting body and the supporting body are respectively one and the other of a supporting leg and a first caster which are arranged on the same side relative to the base.

10. The trolley according to claim 9, characterized in that: The first caster is used as the lifting body, and the trolley further includes a second caster and a third caster that can move away from or toward the base, and the second caster, the third caster and the first caster are arranged on the same side of the base; Wherein, the first caster is connected to the front caster connector, and the second caster and the third caster are commonly connected to the rear caster connector; The connecting rod unit includes a connecting rod assembly, a front hinge assembly, and a rear hinge assembly; The connecting rod assembly is connected to the screw follower and the front hinge assembly and the rear hinge assembly respectively. The front hinge assembly and the rear hinge assembly are connected to the front caster connector and the rear caster connector respectively. When the lead screw rotates in the forward direction along with the output shaft, the lead screw follower drives the front hinge assembly and the rear hinge assembly into an open state via the connecting rod assembly, and then pushes the first caster, the second caster, and the third caster to move away from the base via the front caster connector and the rear caster connector; When the clutch assembly enters a separated state, at least under the action of the gravity of the trolley, the front hinge assembly and the rear hinge assembly enter a folded state, and a force is applied to the screw follower through the connecting rod assembly to translate along the extension direction of the screw. This force drives the screw to rotate in the opposite direction, causing the base to move toward the first caster, the second caster, and the third caster.

Images