Central control trundle

Abstract

The utility model provides a central control trundle. The central control trundle comprises a trundle frame, a rotating component, a stop component and a rolling wheel, the wheel frame comprises a cylinder and a mounting frame arranged on the outer side of the cylinder; the rotating component comprises a hollow shaft, a rotating rod and an output shaft, the hollow shaft is provided with a connecting hole connected with a vehicle body and is rotationally connected into the cylinder body, the output shaft is arranged in a hollow cavity of the hollow shaft, and the rotating rod is connected with the output shaft through a rotating structure; the rolling wheel comprises a wheel shaft piece rotationally connected to the mounting frame and a wheel hub body connected to the wheel shaft piece, and the wheel hub body is provided with a wheel hub cavity; the stop part comprises a stop piece. The hollow shaft is fixedly connected with a vehicle body, the output shaft abuts against the jacking part by rotating the rotating rod and utilizing the rotating structure, so that the clamping part abuts against the hub body, the rolling wheel locking effect is achieved, the retainer is directly hinged to the mounting frame, the length of an input force arm in a formed lever structure is larger than that of an output force arm, and braking is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of caster structures, and more specifically, to a central control caster. Background Art

[0002] The braking principle of the central control caster mainly relies on a mechanical braking device, and the locking and unlocking of the caster are achieved through manual operation or electronic control. When it is necessary to lock the caster, the operator can press the brake button or pull up the brake lever to make the braking device generate frictional force with the wheel hub, so that the caster stops rotating. When it is necessary to unlock the caster, the operator can operate the braking device again to separate the braking device from the wheel hub and restore the free rotation of the caster.

[0003] The Chinese utility model patent with the publication number CN204820956U discloses a fully plastic central control caster, which is composed of an adjusting member, a pressing member, a top column, a pressed member, a sleeve, a first spring, a second spring, a ferrule, a locking member, a third spring, a brake lever, a wheel, a lever bar, a bearing, a brake strip and a positioning member.

[0004] The above central control caster uses the top column to press the lever bar for rotation. Due to the short lever, the rotation amount of the lever bar is small and the braking force is small, making it difficult to ensure the use effect. Summary of the Utility Model

[0005] Based on this, in order to solve the problem that the above central control caster uses the top column to press the lever bar for rotation, and due to the short lever, the rotation amount of the lever bar is small and the braking force is small, making it difficult to ensure the use effect, the utility model provides a central control caster, and its specific technical solution is as follows:

[0006] A central control caster includes a wheel frame, a rotating component, a stopping component and a rolling wheel; the wheel frame includes a cylindrical body and a mounting frame arranged on the outer side of the cylindrical body; the rotating component includes a hollow shaft, a rotating rod and an output shaft. The hollow shaft is provided with a connection hole for connecting with the vehicle body and is rotatably connected in the cylindrical body. The output shaft is arranged in the hollow cavity of the hollow shaft, and the rotating rod is connected with the output shaft through a rotating structure; the rolling wheel includes a wheel shaft member rotatably connected to the mounting frame and a wheel hub body connected to the wheel shaft member, and the wheel hub body is provided with a wheel hub cavity; the stopping component includes a stopper, and the stopper is provided with a hinged part hinged to the mounting frame, a top part that abuts against the rotating component, and a clamping part arranged in the wheel hub cavity; by rotating the rotating rod, the output shaft presses the top part, so that the clamping part abuts against the wheel hub body.

[0007] The above-mentioned central control caster fixes the hollow shaft to the vehicle body. By rotating the rotating rod, the output shaft presses against the top part through the rotating structure, so that the clamping part touches the hub body, achieving the effect of stopping the rolling wheel. Since the stopper is directly hinged to the mounting bracket, the length of the input force arm in the formed lever structure is greater than that of the output force arm, and the braking is stable and reliable.

[0008] Further, the hollow shaft is provided with an input slot, and the rotating rod is inserted into the input slot; the rotating structure is an inclined surface pressing structure or a threaded rotating structure.

[0009] Further, the rotating structure is an inclined surface pressing structure. The rotating component further includes an input block arranged in the hollow cavity, and the rotating rod is fixedly connected to the input block; the inclined surface pressing structure includes a first inclined surface and a first pressing plane arranged on the input block, and a second inclined surface and a second pressing plane arranged at the upper end of the output shaft; by rotating the input block, the first inclined surface is separated from the second inclined surface, and the first pressing plane touches the second pressing plane, and the output shaft presses against the top part.

[0010] Further, the rotating structure is a threaded rotating structure. The rotating component further includes an input block arranged in the hollow cavity and a threaded rod arranged on the input block, and the rotating rod is fixedly connected to the input block; the threaded rotating structure includes a threaded part arranged on the output shaft, and the threaded part is in threaded connection with the threaded rod; by rotating the input block, the threaded rod rotates relative to the output shaft, and the output shaft moves along the axis of the hollow shaft.

[0011] Further, the rotating component further includes a guiding unit and a spring pressing unit; the guiding unit includes a guiding groove arranged on the hollow shaft and a guiding rod arranged on the output shaft; the spring pressing unit includes a first spring, and the first spring presses the output shaft to make the output shaft tend to move away from the top part.

[0012] Further, the rotating component further includes a limiting unit; the limiting unit includes a clamping ring arranged in the cylindrical cavity of the cylinder body and a limiting card slot arranged in the cylindrical cavity of the cylinder body; the outer ring of the clamping ring is provided with an outer card slot adapted to the limiting card slot, and the inner ring is provided with an inner card slot adapted to the end of the guiding rod, and the clamping ring is clamped in the limiting card slot; by driving the output shaft to move along the hollow cavity, the position of the guiding rod in the cylindrical cavity of the cylinder body is changed; when the guiding rod is clamped in the inner card slot, the cylinder body is axially connected to the hub of the hollow shaft; when the guiding rod disengages from the inner card slot, the cylinder body can rotate relative to the hollow shaft.

[0013] Further, the stopping member further includes a second spring; a pressing portion is provided on a side of the stopper away from the clamping portion relative to the hinged portion; a mounting blind hole is provided on the mounting bracket, and the second spring is disposed in the mounting blind hole and abuts against the pressing portion.

[0014] Further, the stopper is further provided with a limiting portion; the cylindrical body is provided with a limiting groove adapted to the limiting portion.

[0015] Further, the clamping portion is provided with a plurality of teeth.

[0016] Further, a rubber layer is provided on the inner wall of the hub body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but the emphasis is placed on showing the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0018] Figure 1 is a schematic structural view of a central control caster according to an embodiment of the present invention;

[0019] Figure 2 is a sectional view of the structure of a central control caster according to an embodiment of the present invention Figure 1 ;

[0020] Figure 3 is a sectional view of the structure of a central control caster according to an embodiment of the present invention Figure 2 ;

[0021] Figure 4 is a partial schematic structural view of a central control caster according to an embodiment of the present invention;

[0022] Figure 5 is a sectional view of the structure of a rotating member and a stopping member according to an embodiment of the present invention.

[0023] Description of the Reference Numerals:

[0024] 1, wheel frame; 2, rotating member; 3, stopping member; 4, rolling wheel; 5, rotating structure;

[0025] 11, cylindrical body; 12, mounting bracket;

[0026] 21, rotating rod; 22, output shaft; 23, hollow shaft; 24, guiding unit; 25, pressing unit; 26, input block; 27, limiting unit;

[0027] 231, input slot;

[0028] 241, guiding groove; 242, guiding rod;

[0029] 251. First spring

[0030] 271. Clamping ring; 272. Limit slot

[0031] 31. Stopper; 32. Second spring

[0032] 311. Hinge part; 312. Top part; 313. Clamping part; 314. Limiting part; 315. Spring pressing part

[0033] 41. Axle part; 42. Hub body Specific embodiments

[0034] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] The "first" and "second" in the present utility model do not represent specific quantities and orders, but are only used for name distinction.

[0038] Such as Figure 1 and Figure 2 、 Figure 3 、 Figure 4As shown in the figure, a central control caster wheel in an embodiment of the present utility model includes a wheel frame 1, a rotating component 2, a stopping component 3, and a rolling wheel 4; the wheel frame 1 includes a cylindrical body 11 and a mounting frame 12 arranged on the outside of the cylindrical body 11; the rotating component 2 includes a hollow shaft 23, a rotating rod 21, and an output shaft 22. The hollow shaft 23 is provided with a connection hole for connecting with the vehicle body and is rotatably connected inside the cylindrical body 11. The output shaft 22 is arranged in the hollow cavity of the hollow shaft 23. The rotating rod 21 is connected to the output shaft 22 through a rotating structure 5; the rolling wheel 4 includes a wheel shaft member 41 rotatably connected to the mounting frame 12 and a hub body 42 connected to the wheel shaft member 41. The hub body 42 is provided with a hub cavity; the stopping component 3 includes a stopper 31. The stopper 31 is provided with a hinged portion 311 hinged to the mounting frame 12, a top portion 312 in contact with the rotating component 2, and a clamping portion 313 arranged in the hub cavity.

[0039] For the above central control caster wheel, the hollow shaft 23 is fixedly connected to the vehicle body. By rotating the rotating rod 21, the output shaft 22 presses against the top portion 312 by using the rotating structure 5, so that the clamping portion 313 touches the hub body 42, achieving the effect of stopping the rolling wheel 4. Since the stopper 31 is directly hinged to the mounting frame 12, in the formed lever structure, the length of the input force arm is greater than that of the output force arm, and the braking is stable and reliable.

[0040] In one embodiment, the hollow shaft 23 is provided with an input slot 231, and the rotating rod 21 is inserted into the input slot 231; the rotating structure 5 is an inclined plane contact structure or a threaded rotation structure.

[0041] In one embodiment, the connection hole includes a first connection hole provided at the upper shaft end of the hollow shaft 23 and a second connection hole perpendicular to the first connection hole.

[0042] In one embodiment, the rotating structure 5 is an inclined plane contact structure. The rotating component 2 further includes an input block 26 arranged in the hollow cavity. The rotating rod 21 is fixedly connected to the input block 26; the inclined plane contact structure includes a first inclined plane and a first contact plane arranged on the input block 26, and a second inclined plane and a second contact plane arranged at the upper end of the output shaft 22. Thus, by rotating the input block 26, the first inclined plane is separated from the second inclined plane, and the first contact plane is in contact with the second contact plane, and the output shaft 22 presses against the top portion 312.

[0043] In one embodiment, the rotating structure 5 is a threaded rotating structure. The rotating member 2 further includes an input block 26 disposed in the hollow cavity and a threaded rod disposed on the input block 26. The rotating rod 21 is fixedly connected to the input block 26. The threaded rotating structure includes a threaded portion disposed on the output shaft 22, and the threaded portion is in threaded connection with the threaded rod. Thus, by rotating the input block 26, the threaded rod rotates relative to the output shaft 22, and the output shaft 22 moves along the axis of the hollow shaft 23.

[0044] As Figure 2 and Figure 3 shown, in one embodiment, the rotating member 2 further includes a guiding unit 24 and a spring pressing unit 25. The guiding unit 24 includes a guiding groove 241 disposed on the hollow shaft 23 and a guiding rod 242 disposed on the output shaft 22. The spring pressing unit 25 includes a first spring 251, and the first spring 251 presses the output shaft 22 to cause the output shaft 22 to have a tendency to move away from the top portion 312. Thus, by using the cooperation of the guiding rod 242 and the guiding groove 241, the output shaft 22 can only move along the axis of the hollow shaft 23 within the hollow shaft 23 and cannot rotate.

[0045] In one embodiment, the rotating member 2 further includes a limiting unit 27. The limiting unit 27 includes a clamping ring 271 disposed in the cylindrical cavity of the cylindrical body 11 and a limiting card slot 272 disposed in the cylindrical cavity of the cylindrical body 11. The outer ring of the clamping ring 271 is provided with an outer card slot adapted to the limiting card slot 272, and the inner ring is provided with an inner card slot adapted to the end of the guiding rod 242. The clamping ring 271 is clamped in the limiting card slot 272. By driving the output shaft 22 to move along the hollow cavity, the position of the guiding rod 242 in the cylindrical cavity of the cylindrical body 11 is changed. When the guiding rod 242 is clamped in the inner card slot, the cylindrical body 11 is axially hub-connected to the hollow shaft 23. When the guiding rod 242 disengages from the inner card slot, the cylindrical body 11 can rotate relative to the hollow shaft 23.

[0046] In a specific embodiment, the central control caster has three control states, namely a fixed state, a movable state, and a braking state:

[0047] When the central control caster is in the fixed state, the guiding rod 242 is clamped in the inner card slot of the clamping ring 271, the hollow shaft 23 is fixedly connected to the vehicle body, the cylindrical body 11 is axially hub-connected to the hollow shaft 23, and the wheel frame 1 cannot rotate relative to the hollow shaft 23;

[0048] When the central caster is in the active state, the guide rod 242 disengages from the inner card slot and the end of the output shaft 22 does not press against the top portion 312 or cause the engaging portion 313 to contact the hub body 42. The cylindrical body 11 can rotate relative to the hollow shaft 23, and at the same time, the hub body 42 can rotate relative to the wheel frame 1;

[0049] When the central caster is in the braking state, the output shaft 22 presses against the top portion 312, and the engaging portion 313 contacts the hub body 42, and the rolling wheel 4 cannot rotate.

[0050] In one embodiment, a limit retaining ring is provided inside the hollow shaft 23; one end of the first spring 251 elastically presses against the shoulder of the output shaft 22, and the other end elastically presses against the limit retaining ring. In this way, the limit retaining ring is used to limit the first spring 251 in the hollow shaft 23, so that the first spring 251 presses against the shoulder of the output shaft 22 to keep the output shaft 22 away from the top portion 312 of the stopper 31.

[0051] As Figure 4 and Figure 5 shown, in one embodiment, the stop member 3 further includes a second spring 32; a spring pressing portion 315 is provided on the side of the stopper 31 away from the engaging portion 313 relative to the hinge portion 311; a mounting blind hole is provided on the mounting bracket 12, and the second spring 32 is disposed in the mounting blind hole and abuts against the spring pressing portion 315.

[0052] In one embodiment, the stopper 31 is further provided with a limiting portion 314; the cylindrical body 11 is provided with a limiting groove adapted to the limiting portion 314. In this way, by pressing the limiting portion 314 against the limiting groove, the position of the top portion 312 is limited, which is convenient for the output shaft 22 to output to a preset position to press against the top portion 312.

[0053] In one embodiment, the engaging portion 313 is provided with a plurality of engaging teeth. In this way, the contact area of the engaging teeth is small. When the engaging teeth contact the hub cavity wall, the contact force is large and the braking effect is good.

[0054] In one embodiment, a rubber layer is provided on the inner wall of the hub body 42. In this way, by providing a rubber layer on the hub cavity wall, the braking effect is ensured.

[0055] In one embodiment, a contact screw is provided on the top portion 312. Specifically, a nut is welded on the stopper 31, and the contact screw is connected to the nut by a threaded connection. In this way, by rotating the contact screw, the contact surface of the contact screw can be adjusted, so as to adjust the rotation angle of the stopper 31 according to the lever length and ensure the braking effect.

[0056] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0057] The above-described embodiments merely represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A central control caster, characterized in that: It includes a wheel frame, a rotating part, a stopping part and a rolling wheel; The wheel frame comprises a cylindrical body and a mounting frame arranged outside the cylindrical body; The rotating component includes a hollow shaft, a rotating rod and an output shaft, wherein the hollow shaft is provided with a connection hole connected to the vehicle body and is rotatably connected to the cylindrical body, the output shaft is arranged in the hollow cavity of the hollow shaft, and the rotating rod is connected to the output shaft through a rotating structure; The rolling wheel comprises a wheel axle member rotatably connected to the mounting frame, and a wheel hub body connected to the wheel axle member, wherein the wheel hub body is provided with a wheel hub cavity; The stop member comprises a stopper, wherein the stopper is provided with a hinged portion hinged on the mounting frame, a top portion contacting the rotating member, and a clamping portion arranged in the wheel hub cavity; By rotating the rotating rod, the output shaft presses the top portion, so that the clamping portion contacts the hub body.

2. A central control caster according to claim 1, characterized in that: The hollow shaft is provided with an input slot, and the rotating rod is inserted into the input slot; The rotating structure is a sloped surface contact structure or a threaded rotating structure.

3. The central control caster according to claim 2, characterized in that: The rotating structure is an inclined surface contact structure, the rotating component further comprises an input block arranged in the hollow cavity, and the rotating rod is fixedly connected to the input block; The inclined surface top contact structure includes a first inclined surface and a first top contact plane arranged on the input block, and a second inclined surface and a second top contact plane arranged on the upper end of the output shaft; By rotating the input block, the first inclined surface is separated from the second inclined surface, the first contact plane contacts the second contact plane, and the output shaft presses the top portion.

4. The central control caster according to claim 2, characterized in that: The rotating structure is a threaded rotating structure, and the rotating component further comprises an input block arranged in the hollow cavity, and a threaded rod arranged on the input block, and the rotating rod is fixedly connected to the input block; The threaded rotation structure includes a threaded portion provided on the output shaft, and the threaded portion is threadedly connected to the threaded rod; By rotating the input block, the threaded rod is rotated relative to the output shaft, and the output shaft moves along the axis of the hollow shaft.

5. The central control caster according to claim 2, characterized in that: The rotating component also includes a guiding unit and a spring pressing unit; The guide unit includes a guide groove arranged on the hollow shaft, and a guide rod arranged on the output shaft; The biasing unit includes a first spring, and the first spring biases the output shaft to make the output shaft tend to move away from the top portion.

6. The central control caster according to claim 5, characterized in that: The rotating component also includes a limiting unit; The limiting unit comprises a retaining ring arranged in the cylindrical cavity, and a limiting retaining groove arranged in the cylindrical cavity; The outer ring of the locking ring is provided with an outer locking groove adapted to the limiting locking groove, and the inner ring is provided with an inner locking groove adapted to the end of the guide rod, and the locking ring is locked in the limiting locking groove; By driving the output shaft to move along the hollow cavity, the position of the guide rod in the cylindrical cavity is changed; When the guide rod is clamped in the inner clamping groove, the cylindrical body is connected to the hollow shaft hub; When the guide rod is disengaged from the inner groove, the cylindrical body can rotate relative to the hollow shaft.

7. The central control caster according to claim 3, characterized in that: The stop member further comprises a second spring; The stopper is provided with a spring-pressing portion on a side of the hinged portion away from the clamping portion; The mounting frame is provided with a mounting blind hole, and the second spring is arranged in the mounting blind hole and contacts the spring-pressing portion.

8. The central control caster according to claim 1, characterized in that: The stopper is also provided with a limiting portion; The cylindrical body is provided with a limiting groove matched with the limiting portion.

9. The central control caster according to claim 1, characterized in that: The clamping portion is provided with a plurality of clamping teeth.

10. The central control caster according to claim 1, characterized in that: The inner wall of the wheel hub is provided with a rubber layer.

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