Height-adjustable floating universal wheel

Abstract

The utility model relates to the technical field of universal wheels, and particularly discloses a height-adjustable floating universal wheel which comprises a wheel seat assembly and a universal wheel assembly, the wheel seat assembly comprises a universal wheel seat and a threaded sleeve located on an inner ring of the universal wheel seat, and the threaded sleeve is connected with the inner ring of the universal wheel seat in a threaded meshing mode. The universal wheel seat is generally fixedly installed at the bottom of the vehicle body, when the threaded sleeve is rotated, the threaded sleeve can move in the vertical direction of the universal wheel seat, the universal wheel assembly is rotatably connected with the threaded sleeve, and therefore when the threaded sleeve moves vertically, the universal wheel assembly can be driven to move vertically, and then the distance between the universal wheel assembly and the vehicle body is adjusted. And the universal wheel assembly comprises a wheel body, a mounting seat and a first elastic piece, the mounting seat is rotatably connected with the threaded sleeve, and the wheel body is mounted on the lower portion of the mounting seat in a floating mode through the first elastic piece so as to be suitable for the uneven road surface.

Description

Technical Field

[0001] The utility model relates to the technical field of universal wheels, in particular to a floating universal wheel with adjustable height. Background Art

[0002] Universal wheels are widely used in industries such as medical equipment, laboratory equipment, logistics and transportation, and furniture. They can make the movement of objects more convenient and efficient. Universal wheels are generally installed on the bottom of various vehicle bodies to assist in movement and steering. However, in the prior art, universal wheels are fixedly installed on the bottom of the vehicle body, and the height distance between them and the chassis is not adjustable. The height of the bottom surface through which they can pass is also fixed, and the passability is poor. In addition, when conventional universal wheels pass through uneven roads, they will cause vibration of the entire vehicle body and have poor shock absorption performance. Summary of the invention

[0003] The utility model is made in consideration of the above-mentioned problems, and the purpose of the utility model is to provide a floating universal wheel with adjustable height, which can realize the height adjustment of the universal wheel and realize floating shock absorption at the same time.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a height-adjustable floating universal wheel, comprising:

[0005] A wheel seat assembly, comprising a universal wheel seat and a screw sleeve located at the inner ring of the universal wheel seat, wherein the screw sleeve is threadedly engaged with the inner ring of the universal wheel seat;

[0006] The universal wheel assembly comprises a wheel body, a mounting seat and a first elastic member. The upper end of the mounting seat can be rotatably fixed in the threaded sleeve, and the wheel body can be floatingly mounted on the lower part of the mounting seat through the first elastic member.

[0007] According to the above-mentioned height-adjustable floating universal wheel, a connecting plate is provided on one side of the wheel body, a transfer part and a limiting part are provided on the connecting plate, and the transfer part is rotatably connected to the lower part of the mounting seat through a hinge shaft;

[0008] The first elastic member is arranged transversely on the mounting seat, and the limiting portion can abut against one end of the first elastic member.

[0009] According to the above-mentioned height-adjustable floating universal wheel, a fixing plate and a guide bolt are provided on the mounting seat, the guide bolt is horizontally arranged on the mounting seat, and one end of the guide bolt is fixedly connected to the fixing plate;

[0010] The first elastic member is sleeved on the outer side of the guide bolt, and the limiting portion can be movably sleeved on the end of the guide bolt away from the fixing plate, and can abut against the end of the first elastic member away from the fixing plate. According to the above-mentioned height-adjustable floating universal wheel, the universal wheel assembly also includes a second elastic member, the length of the second elastic member is shorter than the length of the first elastic member, the second elastic member is sleeved on the guide bolt, and one end of the second elastic member is connected to the fixing plate.

[0011] According to the above-mentioned height-adjustable floating universal wheel, the first elastic member is configured as a spring, and the second elastic member is configured as a polyurethane shock-absorbing block.

[0012] According to the above-mentioned height-adjustable floating universal wheel, the top of the screw sleeve protrudes from the top of the universal wheel seat, and a plurality of rotation holes are provided on the top of the screw sleeve, and the plurality of rotation holes are arranged at intervals on the top of the screw sleeve.

[0013] According to the above-mentioned height-adjustable floating universal wheel, a positioning recess is provided on one side of the top of the screw sleeve, and a positioning hole and a positioning bolt are provided on the universal wheel seat. When the positioning recess faces the positioning hole, the positioning bolt can be inserted into the positioning hole to lock the screw sleeve.

[0014] According to the above-mentioned height-adjustable floating universal wheel, the inner ring of the screw sleeve is provided with a bearing, the upper part of the mounting seat is provided with an upwardly protruding connecting shaft, the connecting shaft can be extended into the bearing, and the top of the connecting shaft is fixedly connected to the bearing through a locking nut.

[0015] The utility model has the following beneficial effects:

[0016] 1. The screw sleeve can be moved up and down by rotating it, which in turn drives the universal wheel assembly under the screw sleeve to move up and down together, thereby adjusting the height of the wheel body, and then adjusting the distance between the wheel body and the bottom plate to improve applicability;

[0017] 2. When the vehicle body is unloaded, the spring provides floating support for the wheel body, which can absorb impact and reduce vibration when passing through uneven roads. When the vehicle body is heavily loaded, the movable plate continuously compresses the spring, which can provide higher auxiliary support force for the wheel body through the polyurethane shock-absorbing block to prevent the wheel body from exceeding the floating range;

[0018] 3. The screw sleeve can be locked by the positioning bolt, which can prevent the screw sleeve from rotating at will and achieve the height positioning of the wheel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0020] Figure 2 is a cross-sectional view of the overall structure of the embodiment;

[0021] Figure 3 It is a top view of the overall structure of the embodiment.

[0022] In the figure:

[0023] 1. wheel seat assembly; 11. universal wheel seat; 111. positioning bolt; 12. threaded sleeve; 121. rotating hole; 122. positioning recess; 123. bearing; 123a. locking nut;

[0024] 2. Universal wheel assembly; 21. Wheel body; 211. Connecting plate; 211a. Transfer part; 211b. Limiting part; 211c. Articulated shaft; 22. Mounting seat; 221. Fixing plate; 223. Guide bolt; 224. Connecting shaft; 23. Spring; 24. Polyurethane shock-absorbing block. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1-3 As shown, a height-adjustable floating universal wheel includes a wheel seat assembly 1 and a universal wheel assembly 2, wherein the wheel seat assembly 1 includes a universal wheel seat 11 and a screw sleeve 12 located on the inner circle of the universal wheel seat 11, the screw sleeve 12 is engaged with the inner circle thread of the universal wheel seat 11, and the universal wheel seat 11 is generally fixedly installed on the bottom of the vehicle body. When the screw sleeve 12 is rotated, the screw sleeve 12 will move along the up and down direction of the universal wheel seat 11, and the universal wheel assembly 2 is rotatably connected to the screw sleeve 12. Therefore, when the screw sleeve 12 moves up and down, it will drive the universal wheel assembly 2 to move up and down, thereby adjusting the distance between the universal wheel assembly 2 and the vehicle body, so as to adapt to roads with obstacles of different heights.

[0027] Specifically, the universal wheel assembly 2 includes a wheel body 21, a mounting seat 22 and a first elastic member. The upper end of the mounting seat 22 can be rotatably fixed in the screw sleeve 12, and the wheel body 21 can be floatingly mounted on the lower part of the mounting seat 22 through the first elastic member. The mounting seat 22 is used to connect the wheel body 21 to the screw sleeve 12. When the screw sleeve 12 moves up and down, it can drive the wheel body 21 to move up and down, and provide floating support for the wheel body 21 through the first elastic member. When passing through an area with uneven road surface, the first elastic member can absorb the kinetic energy of the wheel body 21, thereby reducing the vibration amplitude of the vehicle body driven by the wheel body 21, thereby ensuring the stability of the vehicle body movement.

[0028] In order to realize the elastic support of the wheel body 21 by the first elastic member, a connecting plate 211 is provided on one side of the wheel body 21, and a transfer portion 211a and a limiting portion 211b are provided on the connecting plate 211. The transfer portion 211a is rotatably connected to the lower portion of the mounting seat 22 through a hinge shaft 211c. The first elastic member is arranged laterally on the mounting seat 22, and the limiting portion 211b can abut against one end of the first elastic member. When the wheel body 21 passes through an uneven road surface, the wheel body 21 will move up and down, which will drive the connecting plate 211 to rotate around the hinge shaft 211c. In this process, the limiting portion 211b will squeeze the first elastic member, and use the first elastic member to absorb the kinetic energy of the wheel body 21, thereby reducing the vibration amplitude of the vehicle body.

[0029] Specifically, in order to fix the first elastic member and squeeze the first elastic member, a fixing plate 221 and a guide bolt 223 are provided on the mounting seat 22. The guide bolt 223 is horizontally arranged on the mounting seat 22, and one end of the guide bolt 223 is fixedly connected to the fixing plate 221. The first elastic member is sleeved on the outer side of the guide bolt 223, and one end of the first elastic member is connected to the fixing plate 221. The limiting portion 211b can be movably sleeved on the end of the guide bolt 223 away from the fixing plate 221, and can abut against the end of the first elastic member away from the fixing plate 221. When the limiting portion 211b moves, it will squeeze the first elastic member, thereby playing a role of elastic support. The guide bolt 223 is used to limit the compression direction of the first elastic member. Of course, in order to prevent the limiting portion 211b from separating from the guide bolt 223, a positioning nut can be provided at the end of the guide bolt 223.

[0030] In order to achieve different elastic supporting forces under different load conditions, the universal wheel assembly 2 also includes a second elastic member, the length of the second elastic member is shorter than the length of the first elastic member, the second elastic member is sleeved on the guide bolt 223, and one end of the second elastic member is connected to the fixing plate 221, wherein the first elastic member is set as a spring 23, and the second elastic member is set as a polyurethane shock absorbing block 24, and the polyurethane shock absorbing block 24 has a greater force required for deformation than the spring 23. Therefore, in the no-load state, due to the longer length of the first elastic member, the wheel body 21 will first squeeze the first Elastic member, at this time, the first elastic member is used to provide floating support for the wheel body 21, and in the overload state, the wheel body 21 will first squeeze the first elastic member, but due to the large gravity, it will continue to compress the first elastic member until it abuts against the second elastic member. At this time, the second elastic member is used to provide a higher auxiliary supporting force to ensure the stability of the movement of the wheel body 21. At the same time, when the overload is too large, the rotation amplitude of the limiting part 211b is too large, which will cause the limiting part 211b to abut against the bottom of the mounting seat 22, forcing the limit to avoid further compression of the first elastic member and the second elastic member.

[0031] In order to achieve the driving and locking of the screw sleeve 12, the top of the screw sleeve 12 protrudes from the top of the universal wheel seat 11, and a plurality of rotation holes 121 are provided on the top of the screw sleeve 12. The plurality of rotation holes 121 are arranged at intervals on the top of the screw sleeve 12, and a connecting rod can be inserted into the rotation hole 121. By driving the screw sleeve 12 to rotate by the connecting rod, the up and down movement of the screw sleeve 12 can be achieved. At the same time, a positioning recess 122 is provided on one side of the top of the screw sleeve 12, and a positioning hole and a positioning bolt 111 are provided on the universal wheel seat 11. When the positioning recess 122 faces the positioning hole, the positioning bolt 111 can be inserted into the positioning hole to lock the screw sleeve 12. Of course, in this embodiment, a plurality of positioning holes can be arranged at intervals along the circumference of the screw sleeve 12. As long as the screw sleeve 12 is rotated until the positioning recess 122 faces any positioning hole, it can be positioned by the positioning bolt 111 to avoid automatic rotation of the screw sleeve 12 during the operation of the wheel body 21, thereby improving the safety performance.

[0032] In order to realize the rotatable connection between the mounting seat 22 and the screw sleeve 12, a bearing 123 is provided on the inner ring of the screw sleeve 12, and an upwardly protruding connecting shaft 224 is provided on the upper part of the mounting seat 22. The connecting shaft 224 can be extended into the bearing 123, and the top of the connecting shaft 224 is fixedly connected to the bearing 123 through a locking nut 123a. The connecting shaft 224 can be rotated through the bearing 123, and at the same time, when the screw sleeve 12 moves up and down, it can drive the connecting shaft 224 to move up and down, thereby driving the mounting seat 22 and the wheel body 21 to adjust the up and down movement.

[0033] The technical solution of the utility model is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the idea of ​​the utility model. The specific embodiments described herein are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but this will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A height-adjustable floating universal wheel, characterized in that: include: A wheel seat assembly, comprising a universal wheel seat and a screw sleeve located at the inner ring of the universal wheel seat, wherein the screw sleeve is threadedly engaged with the inner ring of the universal wheel seat; The universal wheel assembly comprises a wheel body, a mounting seat and a first elastic member. The upper end of the mounting seat can be rotatably fixed in the threaded sleeve, and the wheel body can be floatingly mounted on the lower part of the mounting seat through the first elastic member.

2. The height-adjustable floating universal wheel according to claim 1, characterized in that: A connecting plate is provided on one side of the wheel body, a transfer portion and a limiting portion are provided on the connecting plate, and the transfer portion is rotatably connected to the lower portion of the mounting seat through a hinge shaft; The first elastic member is arranged transversely on the mounting seat, and the limiting portion can abut against one end of the first elastic member.

3. The height-adjustable floating universal wheel according to claim 2, characterized in that: The mounting seat is provided with a fixing plate and a guide bolt, the guide bolt is horizontally arranged on the mounting seat, and one end of the guide bolt is fixedly connected to the fixing plate; The first elastic member is sleeved on the outer side of the guide bolt, and the limiting portion can be movably sleeved on the end of the guide bolt away from the fixing plate, and can abut against the end of the first elastic member away from the fixing plate.

4. The height-adjustable floating universal wheel according to claim 3, characterized in that: The universal wheel assembly also includes a second elastic member, the length of the second elastic member is shorter than the length of the first elastic member, the second elastic member is sleeved on the guide bolt, and one end of the second elastic member is connected to the fixing plate.

5. The height-adjustable floating universal wheel according to claim 4, characterized in that: The first elastic member is configured as a spring, and the second elastic member is configured as a polyurethane shock absorbing block.

6. The height-adjustable floating universal wheel according to claim 1, characterized in that: The top of the screw sleeve protrudes from the top of the universal wheel seat, and a plurality of rotation holes are arranged on the top of the screw sleeve, and the plurality of rotation holes are arranged at intervals on the top of the screw sleeve.

7. The height-adjustable floating universal wheel according to claim 6, characterized in that: A positioning recess is provided on one side of the top of the screw sleeve, and a positioning hole and a positioning bolt are provided on the universal wheel seat. When the positioning recess faces the positioning hole, the positioning bolt can be inserted into the positioning hole to lock the screw sleeve.

8. The height-adjustable floating universal wheel according to claim 1, characterized in that: The inner ring of the screw sleeve is provided with a bearing, and the upper part of the mounting seat is provided with an upwardly protruding connecting shaft, the connecting shaft can be inserted into the bearing, and the top of the connecting shaft is fixedly connected to the bearing through a locking nut.

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