Brake structure with balanced force value and trundle

Abstract

The utility model provides a balanced force value brake structure and caster, including horizontal rotating shaft and brake subassembly, brake subassembly includes elevating mechanism and brake mechanism, elevating mechanism includes cam, push rod and limit catch, the cam is provided with curve profile part and micro tooth part; one end of the ejector rod abuts against the curve contour part, the other end of the ejector rod abuts against the brake mechanism, and the brake mechanism is used for conducting brake control on the rotating wheel structure in the up-down lifting process. The ejector rod is sleeved with a first elastic piece, the micro-tooth part is arranged on the side away from the ejector rod, the number of teeth of the micro-tooth part is the same as the number of staying positions on the curve contour part, the limiting blocking piece is arranged on the side, away from the ejector rod, of the micro-tooth part, and the side, facing the micro-tooth part, of the limiting blocking piece is provided with a linear groove matched with teeth of the micro-tooth part. A second elastic piece is arranged on the side, away from the micro-tooth part, of the limiting blocking piece. According to the utility model, the effect of adjusting the force value to be balanced can be achieved, and the effects of clear gear adjustment and low possibility of gear jumping are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mobile trundle technical field, especially a brake structure and trundle of force value balance. BACKGROUND

[0002] With the continuous progress and diversification development of society, the performance demand of various application scenes to trundle is increasingly improved, especially higher requirements are put forward in the flexibility of trundle. Among them, the trundle capable of realizing horizontal 360-degree free rotation, namely the movable trundle or universal wheel that we usually say, can rotate freely in the horizontal direction owing to its unique structure design, greatly improves the moving efficiency and operation flexibility of equipment.

[0003] However, the general brake structure equipped by the traditional universal wheel, although can effectively stop or fix the rotating wheel, but when the gear is adjusted, the adjusting force is quite different between different gears due to the rebound of the elastic piece on the top rod, thereby leading to the problem that the adjustment gear is not clear, and even the gear skipping phenomenon may appear, therefore, the brake structure of the adjusting force value balance is urgently needed. UTILITY MODEL CONTENT

[0004] In order to solve the above problems of prior art, the utility model provides a brake structure and trundle of force value balance, to reach the effect that the adjusting force value is balanced.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme that:

[0006] Firstly, the utility model provides a brake structure of force value balance, including horizontal pivot and brake assembly, the brake assembly includes lifting mechanism and brake mechanism, the lifting mechanism includes cam, top rod and limit stop sheet, the cam is provided with curve profile part and micro tooth part on it;

[0007] One end of the top rod is in abutment with the curve profile part, and the other end is in abututment with the brake mechanism, and the brake mechanism is used for brake control to the rotating wheel structure in the process of lifting up and down;

[0008] The first elastic piece is sleeved on the top rod, the micro tooth part is arranged on the side away from the top rod and the number of teeth is same with the number of stay positions on the curve profile part, the limit stop sheet is arranged on the side away from the top rod of the micro tooth part and is provided with a slot on the side towards the micro tooth part, the slot is matched with the tooth of the micro tooth part, and the second elastic piece is arranged on the side away from the micro tooth part of the limit stop sheet.

[0009] The utility model discloses beneficial effect lies in: through the second elastic member to neutralize the influence that first elastic member received top rod, thereby make the adjustment hand feeling strength of multiple gears close, reach the effect of balanced regulation force value, have played the role of clear adjustment gear, not easy to skip gear.

[0010] Optionally, the second elastic member is at least two superimposed spring washers.

[0011] Optionally, the cam further comprises a stroke blocking part, and the lifting mechanism further comprises an annular blocking piece, and the limiting blocking piece is located in the middle region of the annular blocking piece.

[0012] The stroke blocking part is in abutment with the annular blocking piece when the stroke blocking part contacts the top rod at both ends of the curved contour part.

[0013] Optionally, the lifting mechanism is further provided with a fixed cover above the micro-tooth part, one side of the limiting blocking piece away from the micro-tooth part is a central protrusion, the top of the fixed cover is provided with an opening for the central protrusion to extend out, and the second elastic member is sleeved outside the central protrusion and placed between the limiting blocking piece and the fixed cover.

[0014] Optionally, the cam is further provided with an adjusting part, and the adjusting part is arranged in the operable region of the horizontal rotating shaft.

[0015] Optionally, the brake mechanism comprises a brake inner tooth piece and at least two groups of first clamping parts arranged in the up-down lifting process of the top rod, and one end of the top rod away from the cam is in abutment with the brake inner tooth piece.

[0016] The horizontal rotating shaft comprises a main shaft, the lifting mechanism is located in the hollow through hole of the main shaft, the top rod is in clamping connection with the main shaft in the horizontal direction and is sleeved with the first elastic member, the top rod is provided with a second clamping part, the second clamping part is in clamping connection with the two groups of first clamping parts in the horizontal direction in the up-down movement process, and the brake inner tooth piece is used for brake control on the rotating wheel structure in the up-down lifting process.

[0017] According to the above description, the top rod is lifted up and down by the cam, and is in horizontal clamping between the second clamping part and the two first clamping parts, so that whether the corresponding horizontal rotating shaft and the rotating wheel structure rotate can be controlled, thereby the straight mode, the full free rotation mode and the brake stationary mode can be realized, so that the multi-gear working mode of the caster can be realized.

[0018] Optionally, the brake mechanism further comprises a main plate, one end of the main plate is provided with a U-shaped opening, two groups of first clamping parts are arranged along the up-down direction of the U-shaped opening, and the brake inner gear is provided with at least one on one side of the main plate and moves with the top rod.

[0019] Optionally, the brake inner gear comprises a brake support, a third elastic element and an annular gear, one end of the brake support is movably connected with one end of the top rod, the side of the brake support away from the top rod is abuttingly connected with the third elastic element, and the annular gear is fixedly connected with the brake support and is provided with at least one on one side of the main plate.

[0020] Optionally, the lifting mechanism further comprises a top cap nut, the curved contour portion abuts against one end of the top cap nut, and the other end of the top cap nut is threadedly connected with one end of the top rod.

[0021] The top cap nut is located in the hollow through hole of the main shaft, and the shell of the main shaft is provided with an opening at the position corresponding to the top cap nut.

[0022] According to the above description, the top cap nut is pushed by the opening, so that the top cap nut and the top rod are screwedly rotated, thereby driving the top rod to be lifted up and down, so as to compensate for the tolerance of the cooperating parts on the top rod and the brake mechanism, thereby ensuring the brake effect.

[0023] In the second aspect, the utility model provides a caster, including rotating wheel structure and first aspect's one kind of installation error adjustable's brake structure, brake mechanism is in the up and down lifting process with rotating tooth of rotating wheel structure activity connection, to brake control rotating wheel structure.

[0024] Wherein, the second aspect provides a corresponding technical effect of the caster of the first aspect of the brake structure of the force value balance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the brake structure of the force value balance of the utility model embodiment;

[0026] Figure 2 It is a partial schematic view of the brake structure of the force value balance of the utility model embodiment;

[0027] Figure 3 It is a structure schematic view of the caster of the utility model embodiment;

[0028] Figure 4 It is a partial schematic view of the caster of the utility model embodiment;

[0029] Figure 5A cross section schematic view of a caster of the utility model embodiment;

[0030] Figure 6 For Figure 5 An enlarged schematic view of the middle area A.

[0031] Explanation of reference signs:

[0032] 1, horizontal rotating shaft;11, main shaft;110, shell;111, hollow through hole;112, opening;113, transverse perforation;

[0033] 2, brake assembly;21, lifting mechanism;211, cam;2111, curved profile part;2112, internal hexagonal hole;2113, stroke blocking part;2114, micro tooth part;212, top hat nut;2121, toothed groove;213, top rod;2131, second clamping part;2132, first elastic member;2133, lifting piece;2134, fourth elastic member;22, brake mechanism;221, main plate;222, brake inner tooth piece;2221, brake support;2222, third elastic member;2223, annular tooth piece;223, U-shaped port;224, first clamping part;23, limit stop sheet;231, slot;232, center protrusion;24, fixed cover;241, opening;25, spring washer;26, annular stop sheet;

[0034] 100, rotating wheel structure;101, rotating tooth. DETAILED DESCRIPTION

[0035] In order to better understand the above technical solutions, the exemplary embodiments of the utility model will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a clearer and more thorough understanding of the utility model and to enable the scope of the utility model to be fully conveyed to those skilled in the art.

[0036] Embodiment one

[0037] Please refer to Figures 1 to 6 The utility model provides a brake structure of force value balance, including horizontal rotating shaft 1 and brake assembly 2, brake assembly 2 includes lifting mechanism 21 and brake mechanism 22.

[0038] The lifting mechanism 21 comprises a cam 211, a top rod 213, a limiting stop sheet 23 and an annular stop sheet 26. The cam 211 is provided with a curved profile portion 2111, a micro-tooth portion 2114 and a stroke blocking portion 2113. At this time, one end of the top rod 213 is in abutment with the curved profile portion 2111, and the other end is in abutment with a brake mechanism 22 for brake control of the caster structure 100 during up and down lifting. The top rod 213 is sleeved with a first elastic member 2132. The micro-tooth portion 2114 is provided on the side away from the top rod 213 and has the same number of teeth as the number of stop positions on the curved profile portion 2111. The limiting stop sheet 23 is provided on the side away from the micro-tooth portion 2114 and is provided with a slot 231 on the side facing the micro-tooth portion 2114, which is matched with the teeth of the micro-tooth portion 2114. The side away from the micro-tooth portion 2114 of the limiting stop sheet 23 is provided with a second elastic member. In this embodiment, the limiting stop sheet 23 is located in the middle region of the annular stop sheet 26. The stroke blocking portion 2113 is in abutment with the annular stop sheet 26 when the stroke blocking portion 2113 contacts the top rod 213 at both ends of the stroke of the curved profile portion 2111.

[0039] The micro-tooth portion 2114 corresponds to the curved profile portion 2111, that is, the curved profile portion 2111 has three abutment positions corresponding to three working modes, and the micro-tooth portion 2114 has three teeth, and the rotation stroke of adjacent teeth is the same as that of the three abutment positions. Thus, when one abutment position on the curved profile portion 2111 is in contact with the top rod 213, the slot 231 of the limiting stop sheet 23 is engaged with the teeth on the micro-tooth portion 2114, which can increase the hand feeling of adjustment to position and ensure the contact stability of the cam 211 and the top rod 213, thereby ensuring the stability of the entire caster in different working modes.

[0040] The stroke blocking portion 2113 is in abutment with the annular stop sheet 26 when the stroke blocking portion 2113 contacts the top rod 213 at both ends of the stroke of the curved profile portion 2111. In this embodiment, the stroke blocking portion 2113 is an ear portion on both sides of the cam 211. When the curved profile portion 2111 is in abutment with the top rod 213, the ear portion is suspended in the hollow through hole 111 and does not restrict the rotation of the cam 211. When the curved profile portion 2111 contacts the top rod 213 at both ends of the stroke, the ear portion is in close contact with the annular stop sheet 26, so that the cam 211 cannot continue to rotate in the original direction, thereby limiting the adjustment range of the cam 211 by the user to be always within the stroke range of the curved profile portion 2111 in abutment with the top rod 213.

[0041] In this embodiment, the lifting mechanism 21 is further provided with a fixed cover 24 above the micro-tooth portion 2114. The side away from the micro-tooth portion 2114 of the limiting stop sheet 23 is a center protrusion 232. The top of the fixed cover 24 is provided with an opening 241 for the center protrusion 232 to extend out. The second elastic member is sleeved outside the center protrusion 232 and is placed between the limiting stop sheet 23 and the fixed cover 24.

[0042] In the embodiment, the second elastic member is three spring washers 25, and two adjacent spring washers 25 are reversely stacked. In other embodiments, the second elastic member can be at least two stacked spring washers 25, and the spring washers 25 are a direction a toward the top rod 213 and a direction b away from the top rod 213. In other embodiments, the two spring washers 25 can be stacked in aa direction or ab direction, or the three spring washers 25 can be stacked in aaa direction, aab direction, aba direction, abb direction, baa direction, bab direction, bba direction, or bbb direction, or four spring washers 25 can be stacked in aabb direction or other arrangement directions, and so on. Meanwhile, the second elastic member can also be a spring or other elastic member.

[0043] Therefore, when the cam 211 drives the top rod 213 to move downward, the first elastic member 2132 needs to be compressed, and at this time, the second elastic member provides a downward springback force to neutralize the compression force required by the first elastic member 2132. When the cam 211 drives the top rod 213 to move upward, the first elastic member 2132 springs back, but the cam 211 needs to compress the second elastic member, thereby neutralizing the springback force of the first elastic member 2132, so that the adjustment hand feeling force of the three gears is close, and the effect of balancing the adjustment force value is achieved, and the clear gear adjustment and the difficulty of gear skipping are achieved.

[0044] Embodiment two

[0045] Please refer to Figures 1 to 6 The utility model provides a brake structure of force value balance, on the basis of above embodiment one, in this embodiment, combine Figure 2 、 Figure 4 and Figure 5 It can be known that the adjusting part is arranged on the operable area of the horizontal rotating shaft 1, and one end of the top rod 213 abuts against the curved contour part 2111. In this embodiment, the adjusting part is an internal hexagonal hole 2112, and the shell 110 of the main shaft 11 is provided with a transverse perforation 113 at the position corresponding to the internal hexagonal hole 2112. Thus, the internal hexagonal wrench is used to rotate the cam 211, so as to realize the up-down adjustment of the top rod 213. Therefore, the curved contour part 2111 on the cam 211 ensures the smooth transition in the adjustment process, so that the effect of balancing the adjustment force value is achieved. In other embodiments, the adjusting part can also be an adjusting hole with other shapes, such as an internal quadrangular hole, an internal pentagonal hole, and the like, and the corresponding wrench can be used to realize the rotation.

[0046] The horizontal rotating shaft 1 comprises a main shaft 11, and the lifting mechanism 21 is located in the hollow through hole 111 of the main shaft 11.

[0047] In this embodiment, the braking mechanism 22 includes a main board 221 and a brake internal gear 222. One end of the main board 221 is provided with a U-shaped opening 223. During the up-and-down movement of the push rod 213, the U-shaped opening 223 is provided with two sets of first retaining parts 224 along the vertical direction. The push rod 213 is engaged with the main shaft 11 in the horizontal direction and is fitted with a first elastic member 2132. A second retaining part 2131 is provided in the area near the main board 221. During the up-and-down movement, the second retaining part 2131 engages with the two sets of first retaining parts 224 in the horizontal direction. Thus, when the second retaining part 2131 of the push rod 213 engages with the two sets of first retaining parts 224 in the horizontal direction, the horizontal rotating shaft 1 is affected by the horizontal engagement and stops rotating. Only when the second retaining part 2131 on the push rod 213 is between the two first retaining parts 224 can the horizontal rotating shaft 1 rotate freely.

[0048] It should be noted that the two sets of first holding parts 224 can have the same structure or different structures, and the corresponding second holding parts 2131 can be the same component or two components. The first holding parts 224 can be partial or can be circumferential. Refer to this embodiment. Figure 2 It can be seen that the upper first retaining part 224 is a flange structure, and the lower first retaining part 224 is a toothed structure. Both are provided on both sides of the U-shaped opening 223. The corresponding second retaining part 2131 includes an upper rotating disk structure and a lower gear structure. The rotating disk structure has a notch that connects with the flange, and the gear structure and the toothed structure are meshed together. Therefore, in this embodiment, the main shaft 11 has a greater locking force, smaller gap, and greater precision, and the casters can more easily travel in a straight line.

[0049] The other end of the push rod 213 abuts against the brake internal gear 222, which is used to brake the rotating wheel structure 100 during the up-and-down lifting process. At least one brake internal gear 222 is provided on one side of the main board 221 and moves with the push rod 213. Figure 1 As shown, in this embodiment, there is one brake internal gear 222 on each side of the main board 221.

[0050] like Figure 2 As shown, a lifting member 2133 is provided at the other end of the top rod 213, and a fourth elastic member 2134 is provided on both sides of the U-shaped opening 223. The lifting member 2133 moves up and down in the U-shaped opening 223, and both sides abut against the fourth elastic member 2134.

[0051] Specifically, the brake inner gear 222 comprises a brake support 2221, a third elastic member 2222 and an annular gear 2223, one end of the brake support 2221 is movably connected with one end of the top rod 213, the side of the brake support 2221 away from the top rod 213 is abuttingly connected on the third elastic member 2222, the annular gear 2223 is fixedly connected with the brake support 2221, and at least one is arranged on one side of the main plate 221. Thus, the brake support 2221 moves with the movement of the top rod 213, thereby driving the annular gear 2223 to move to movably connect with the rotating tooth 101 of the rotating structure 100. Specifically, the annular gear 2223 and the rotating tooth 101 are correspondingly provided with dense triangular teeth, and the combination is more compact and the gap is smaller, so as to avoid shaking.

[0052] In the embodiment, the first elastic member 2132, the third elastic member 2222 and the fourth elastic member 2134 are all spring structures, which are used to provide the resilient reset of the top rod 213 and the brake support 2221.

[0053] In the embodiment, the brake structure is of metal material except the brake support 2221 and the annular gear 2223, and has the characteristics of high strength and long service life.

[0054] Embodiment three

[0055] Please refer to Figures 1 to 6 The utility model provides a brake structure of force value balance, on the basis of above mentioned embodiment one, in this embodiment, the lifting mechanism 21 still includes top hat nut 212, the curve contour part 2111 with one end of top hat nut 212 abuts, the other end of top hat nut 212 with one end of top rod 213 is screwed together. Among them, top hat nut 212 is located in the hollow through hole 111 of main shaft 11, and the shell 110 of main shaft 11 is provided with opening 112 at the corresponding place of top hat nut 212.

[0056] In the embodiment, the outer edge of the top hat nut 212 is uniformly surrounded by a plurality of tooth-shaped grooves 2121, so that the opening 112 always has an adjustable tooth-shaped groove 2121 at the corresponding position. The user only needs to insert a utility knife into the opening 112 and rotate the top hat nut 212 by pulling it, which can change the height of the top rod 213 to compensate for the tolerance between the top rod 213 and the mating parts on the brake mechanism 22.

[0057] In the embodiment, the shell 110 of the main shaft 11 is provided with a mounting hole at the position corresponding to the opening 112, which can be a threaded hole. Here, the mounting hole can be the opening 112 itself, or one or more new hole positions uniformly arranged along the same horizontal plane on the shell 110 of the main shaft 11. The mounting hole is used to mount the caster in application scenarios such as hospital beds and trolleys.

[0058] Embodiment four

[0059] Please refer to Figures 1 to 6 The utility model provides a trundle, including any one of embodiment one to three's brake structure of force value balance, brake inner tooth piece 222 is in the up and down process of movement with the rotation tooth 101 of trundle structure 100 active connection to trundle structure 100 is carried out brake control. Among them, trundle structure 100 refers to prior art, the utility model does not repeat.

[0060] Summarizing, for the trundle carries out three gear work mode's adjustment process as follows:

[0061] Through inner hexagonal spanner rotation cam 211, drive top rod 213 up and down, when the second clamping portion 2131 of top rod 213 and the first clamping portion 224 on the upper side are clamped in the horizontal direction, horizontal pivot 1 is influenced by top rod 213 and thus keeps still, at this time, annular tooth piece 2223 on brake mechanism 22 is not contacted with rotation tooth 101, does not affect the linear rotation of trundle structure 100, and thus the trundle is in straight mode. When top rod 213 continues to descend, the second clamping portion 2131 of top rod 213 is between two first clamping portions 224, and horizontal pivot 1 and trundle structure 100 are not constrained, and thus the trundle is in full free rotation mode. When top rod 213 continues to descend, the second clamping portion 2131 of top rod 213 is clamped with the first clamping portion 224 on the lower side in the horizontal direction, horizontal pivot 1 is influenced by top rod 213 and thus keeps still, and rotation tooth 101 of trundle structure 100 is meshed by annular tooth piece 2223 on brake mechanism 22 and thus keeps still, so that the trundle is in brake stationary mode.

[0062] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0063] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication between two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0064] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature, which can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "under" and "under" the second feature, which can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0065] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can modify, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A brake structure in which force values are balanced, characterized by, The brake assembly comprises a lifting mechanism and a brake mechanism, the lifting mechanism comprises a cam, a top rod and a limit stop, the cam is provided with a curved profile and a micro-tooth part; One end of the top rod is in abutment with the curved profile, and the other end is in abutment with the brake mechanism, the brake mechanism is used for brake control of the rotating wheel structure during up and down movement. The top rod is sleeved with a first elastic member, the micro-tooth part is arranged on the side away from the top rod, the number of teeth is the same as the number of stop positions on the curved profile, the limit stop is arranged on the side away from the micro-tooth part, and a slot is arranged on the side towards the micro-tooth part.

2. The brake structure of claim 1, wherein The second elastic member is at least two superimposed spring washers.

3. The brake structure of claim 1, wherein The cam further comprises a stroke blocking part, the lifting mechanism further comprises an annular stop, and the limit stop is located in the middle region of the annular stop. The stroke blocking part is in abutment with the annular stop when the stroke blocking part contacts the top rod at both ends of the stroke of the curved profile.

4. The brake structure of claim 1, wherein The lifting mechanism is further provided with a fixed cover above the micro-tooth part, the side away from the micro-tooth part of the limit stop is a center protrusion, the top of the fixed cover is provided with an opening for the center protrusion to extend out, and the second elastic member is sleeved outside the center protrusion and placed between the limit stop and the fixed cover.

5. The brake structure of claim 1, wherein The cam is further provided with an adjusting part, and the adjusting part is arranged in the operable region of the horizontal rotating shaft.

6. The brake structure of any one of claims 1 to 5, wherein The brake mechanism comprises a brake inner tooth part and at least two groups of first clamping parts during up and down movement of the top rod, and one end of the top rod away from the cam is in abutment with the brake inner tooth part. The horizontal rotating shaft comprises a main shaft, the lifting mechanism is located in the hollow through hole of the main shaft, the top rod is clamped with the main shaft in the horizontal direction and sleeved with a first elastic member, the top rod is provided with a second clamping part, the second clamping part is clamped with two groups of first clamping parts in the horizontal direction during up and down movement, and the brake inner tooth part is used for brake control of the rotating wheel structure during up and down movement.

7. The brake structure of claim 6, wherein The brake mechanism further comprises a main plate, one end of the main plate is provided with a U-shaped opening, two groups of first clamping parts are arranged along the up and down direction of the U-shaped opening, and the brake inner tooth part is arranged on at least one side of the main plate and moves with the top rod.

8. The brake structure of claim 7, wherein The brake inner tooth part comprises a brake support, a third elastic member and an annular tooth part, one end of the brake support is movably connected with one end of the top rod, the side of the brake support away from the top rod is in abutment connection with the third elastic member, the annular tooth part is fixedly connected with the brake support, and at least one is arranged on one side of the main plate.

9. The brake structure of claim 6, wherein, The lifting mechanism further comprises a top hat nut, the curved profile is in abutment with one end of the top hat nut, and the other end of the top hat nut is threadedly connected with one end of the top rod. The top hat nut is located in the hollow through hole of the main shaft, and the shell of the main shaft is provided with an opening at the position corresponding to the top hat nut.

10. A caster characterized by, The brake structure comprises a rotating structure and a brake mechanism, the brake mechanism is movably connected with the rotating teeth of the rotating structure during the up-down movement, and the brake mechanism is used for brake control of the rotating structure.

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