Traceless caster with good mute buffering performance

Abstract

This utility model discloses a silent, non-marking caster with good cushioning performance. It includes a bracket, which comprises a top plate and two arm plates fixed to the left and right ends of the lower side of the top plate. A mounting plate is rotatably mounted on the upper side of the top plate. A forward-extending arm plate is hinged to the lower end of each of the two arm plates. The rear ends of the two arm plates are fixedly connected by a connecting plate to form a bracket. A roller is rotatably mounted on the inner front end of the two arm plates via a wheel axle assembly. The roller includes a hub and a tire fitted onto the outer circumferential side of the hub. The tire is made of a flexible polymer material. A longitudinal shock-absorbing component is provided between the front end of the arm plate and the front end of the top plate. The caster exhibits excellent shock absorption and cushioning performance during load-bearing movement. During load-bearing movement, the elastic deformation of the tire can mitigate the instantaneous impact of the caster on the ground. The tire can also maintain friction while making flexible contact with the ground, avoiding hard scraping and tire wear. It also provides quiet operation and leaves no marks.

Description

Technical Field

[0001] This utility model relates to the field of caster technology, specifically to a non-marking caster with good silent cushioning performance. Background Technology

[0002] Casters are a general term that includes swivel casters and fixed casters. Swivel casters, also known as universal casters, have a structure that allows for 360° rotation; fixed casters, also called directional casters, do not have a rotating structure and cannot turn. Usually, the two types of casters are used together. For example, a handcart typically has two fixed casters at the front and two swivel casters near the push handle at the back.

[0003] Traditional swivel casters mostly lack shock-absorbing structures in their brackets, resulting in poor cushioning performance. Especially under heavy loads, the casters vibrate violently on uneven surfaces, leading to significant wear and tear over time, severely limiting their lifespan. Furthermore, the casters generate considerable noise during operation, causing noise pollution and affecting user comfort. Therefore, this invention proposes a quiet, non-marking caster with excellent cushioning performance to solve the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this utility model is to overcome the defects existing in the prior art and provide a silent, non-marking caster with good cushioning performance. The bracket is formed by hinged connection of bracket one and bracket two. A longitudinal shock-absorbing component is provided between the top plate on bracket one and the front end of the arm plate two on bracket two, so that the caster has excellent shock absorption and cushioning performance during load walking, and can move smoothly even on uneven ground. A flexible polymer tire is fitted on the outer circumference of the wheel hub on the roller, so that the caster can use the elastic deformation of the tire to reduce the instantaneous impact of the caster on the ground during load walking, avoiding excessive impact and damage to the ground. The tire can also make flexible contact with the ground while ensuring friction, avoiding hard scraping and wear of the tire, extending the service life of the caster, and also has excellent performance in silent noise reduction and leaving no marks when walking.

[0005] To achieve the above objectives, the technical solution of this utility model is to design a non-marking caster with good quiet cushioning performance, including a mounting plate, a bracket one, a bracket two, a roller, and a wheel axle assembly. The bracket one includes a top plate and two arm plates one. One arm plate one is fixed to the left end of the lower side of the top plate, and the other arm plate one is correspondingly fixed to the right end of the lower side of the top plate. The mounting plate is rotatably mounted on the upper side of the top plate of the bracket one. A forward-extending arm plate two is respectively hinged to the lower end of the two arm plates one. The rear ends of the two arm plates two are fixedly connected together by a connecting plate one to form the bracket two. The roller is rotatably mounted on the inner front end of the two arm plates two through the wheel axle assembly. The roller includes a hub rotatably mounted on the wheel axle assembly and a tire sleeved on the outer circumferential side of the hub. The tire is made of flexible polymer material. A longitudinal shock-absorbing assembly is provided between the front end of one or two arm plates two and the front end of the top plate.

[0006] This utility model discloses a silent, cushioning, and non-marking caster. The bracket is formed by hinged connection of bracket one and bracket two. A longitudinal shock-absorbing component is provided between the top plate on bracket one and the front end of the arm plate two on bracket two, which gives the caster excellent shock absorption and cushioning performance during load-bearing walking, allowing it to travel smoothly even on uneven ground. A flexible polymer tire is fitted on the outer circumference of the wheel hub on the roller, allowing the caster to use the elastic deformation of the tire to reduce the instantaneous impact of the caster on the ground during load-bearing walking, avoiding excessive impact that could damage the ground. The tire can also make flexible contact with the ground while maintaining friction, avoiding hard scraping and wear on the tire, extending the service life of the caster, and also has excellent performance in terms of quiet noise reduction and leaving no marks when walking.

[0007] The preferred technical solution is that the longitudinal shock absorption component includes a screw fixedly installed longitudinally at the front end of the second arm plate and the front end of the top plate, and the screw corresponds to the wheel axle assembly. A spring and a shock-absorbing sleeve are sequentially sleeved on the screw from the inside to the outside. The lower end of the spring abuts against the front end of the corresponding second arm plate, and the upper end abuts against the front end of the top plate. The lower end of the shock-absorbing sleeve is placed at the front end of the corresponding second arm plate, and a buffer gap is left between the upper end and the lower side of the front end of the top plate. The longitudinal shock absorption component has a clever and reasonable structural design, and the correspondence between the screw and the wheel axle assembly ensures that the center of the longitudinal shock absorption component corresponds to the center of the roller. When the caster is lightly loaded, the spring provides shock absorption and cushioning; when the caster is under medium or heavy load, the spring and the shock-absorbing sleeve work together to provide shock absorption and cushioning, thereby ensuring that the non-marking caster of this invention has excellent shock absorption and cushioning performance under different load conditions.

[0008] A further preferred technical solution includes two ear plates located at the top corners of the top plate, and ear plates extending horizontally outward from the front ends of both arm plates. The longitudinal damping components include two sets: one set is fixed between a set of corresponding ear plates 1 and 2 on the left side, and the other set is fixed between a set of corresponding ear plates 1 and 2 on the right side. A screw on the longitudinal damping component passes through the mounting holes on a set of corresponding ear plates 1 and 2. A cap at one end of the screw is engaged with one of ear plates 1 or 2, and the other end of the screw passes through the mounting hole on the other ear plate 1 or 2 and is screwed with a nut. The lower end of the spring abuts against the upper side of the corresponding ear plate 2, and the upper end abuts against the lower side of the corresponding ear plate 1. The lower end of the damping sleeve is placed on the upper side of the corresponding ear plate 2. The longitudinal damping components are installed between corresponding ear plates 1 and 2 of bracket 1 and bracket 2, which facilitates the fixed installation of the longitudinal damping components on the brackets and ensures good stability of the longitudinal damping components on the brackets, further ensuring that the longitudinal damping components can better perform their damping and buffering performance.

[0009] A further preferred technical solution includes an annular base plate integrally formed at the lower end of the shock-absorbing sleeve, extending towards its inner circumference. The longitudinal shock-absorbing assembly also includes an annular washer laid on the upper side of the annular base plate. The screw passes through the central hole of both the annular base plate and the annular washer. The lower end of the spring abuts against the annular washer. The lower end of the spring abuts against the annular base plate at the bottom of the longitudinal shock-absorbing assembly via the annular washer, thereby further improving the noise reduction effect when the caster is under load.

[0010] A further preferred technical solution includes a wheel axle assembly comprising a rotating shaft passing through the front ends of the two arm plates and a locking nut assembly screwed onto the end of the rotating shaft and securing it to the front ends of the two arm plates. Two rollers are rotatably mounted on the rotating shaft, and a spacer sleeve passing through the middle of the rotating shaft to separate the two rollers is also present. The two ends of the spacer sleeve abut against the inner rings of the bearings inside the two rollers. Both the shock-absorbing sleeve and the tire are made of polyurethane. The two rollers rotatably mounted on the wheel axle provide differential steering when the caster is under load, further improving the steering flexibility and stability of the non-marking caster, especially under heavy loads.

[0011] A further preferred technical solution is that the rear end of the second arm plate and the corresponding lower end of the first arm plate are hinged together by bolt assemblies passing through the corresponding mounting holes on both. The hinged connection between the second arm plate and the first arm plate is simple, thus ensuring convenient and efficient assembly of the first and second brackets.

[0012] A further preferred technical solution includes two arm plates located inside the first bracket. The upper edges of both arm plates have upward-opening limiting grooves at their midpoints. A support arm is bent along the front vertical edge of the first arm plate, extending downwards into the first bracket, and its lower end is inserted into the limiting groove on the corresponding side of the second arm plate. The upper ends of the rear edges of both arm plates are welded to the rear edge of the top plate via a connecting plate. When the caster is under load, the two arm plates on the second bracket rotate around their rear hinge points until the lower ends of the support arms abut against the bottom of the limiting grooves on the corresponding arm plates, at which point the second bracket stops rotating. Thus, the support arms and limiting grooves constitute a limiting and anti-rotation mechanism between the first and second brackets, ensuring the stability of the non-marking caster under load.

[0013] A further preferred technical solution includes a mounting sleeve fixed to the upper side of the top plate, and a downwardly extending shaft fixed to the center of the mounting plate. The lower end of the shaft passes through the mounting sleeve and the central hole of the top plate and extends to the lower side of the top plate. A nut is screwed onto the threaded section at the lower end of the shaft, and a washer is fitted between the top plate and the nut at the lower end of the shaft. The upper end of the mounting sleeve and the lower side of the mounting plate are rotatably connected by a thrust bearing, and the lower end of the mounting sleeve is rotatably connected to the lower end of the shaft by a cylindrical roller bearing. The mounting plate and the shaft are rotatably connected to the mounting sleeve on the bracket through the thrust bearing and the cylindrical roller bearing, ensuring good rotational flexibility and quiet operation when the bracket rotates relative to the mounting plate.

[0014] A further preferred technical solution is that the upper end of the shaft is passed through and welded to the center hole of the mounting plate; or, the upper end of the shaft is passed through and welded to the center hole of the mounting plate, and the upper end of the shaft also has an annular mounting plate extending horizontally outward, and the annular mounting plate is fitted and fixed to the lower side of the mounting plate. The method of fixing the upper end of the shaft to the mounting plate is simple, ensuring the smooth processing and implementation of this utility model's quiet, cushioning, and non-marking caster.

[0015] A further preferred technical solution is that the mounting plate and the annular mounting plate are provided with corresponding mounting holes, and a countersunk groove is provided at the upper end of the mounting hole on the mounting plate. The mounting plate and the annular mounting plate are fixedly connected together by screws that pass through the corresponding mounting holes on both, and the end caps at the upper ends of the screws are embedded in the countersunk grooves at the upper end of the mounting holes on the mounting plate.

[0016] The advantages and beneficial effects of this utility model are as follows:

[0017] 1. This utility model discloses a silent, cushioning, and non-marking caster. The bracket is formed by hinged connection of bracket one and bracket two. A longitudinal shock-absorbing component is provided between the top plate on bracket one and the front end of the arm plate two on bracket two, which gives the caster excellent shock absorption and cushioning performance during load-bearing walking, allowing it to travel smoothly even on uneven ground. A flexible polymer tire is fitted on the outer circumference of the wheel hub on the roller, which allows the caster to use the elastic deformation of the tire to reduce the instantaneous impact of the caster on the ground during load-bearing walking, avoiding excessive impact that could damage the ground. The tire can also make flexible contact with the ground while maintaining friction, avoiding hard scraping and wear on the tire, extending the service life of the caster, and also has excellent performance in terms of noise reduction and leaving no marks when walking.

[0018] 2. The longitudinal shock absorption assembly includes a screw fixedly installed longitudinally at the front end of the second arm plate and the front end of the top plate. A spring and a shock-absorbing sleeve are sequentially sleeved on the screw from the inside out. The lower end of the spring abuts against the front end of the corresponding second arm plate, and the upper end abuts against the front end of the top plate. The lower end of the shock-absorbing sleeve is placed at the front end of the corresponding second arm plate, and a buffer gap is left between the upper end and the lower side of the front end of the top plate. The longitudinal shock absorption assembly has a clever and reasonable structural design, and the screw and wheel axle assembly correspond so that the center of the longitudinal shock absorption assembly corresponds to the center of the roller. When the caster is lightly loaded, the spring provides shock absorption and cushioning; when the caster is under medium or heavy load, the spring and the shock-absorbing sleeve work together to provide shock absorption and cushioning, thus ensuring that the non-marking caster of this invention has excellent shock absorption and cushioning performance under different load conditions.

[0019] 3. The longitudinal damping components are installed between the corresponding ear plates 1 and 2 of bracket 1 and bracket 2, which facilitates the fixed installation of the longitudinal damping components on the bracket and ensures good stability of the longitudinal damping components on the bracket, further ensuring that the longitudinal damping components can better perform their damping and buffering performance.

[0020] 4. The lower end of the spring abuts against the annular base plate at the bottom of the longitudinal shock absorption assembly via an annular washer, thereby further improving the noise reduction effect when the caster is under load.

[0021] 5. Two rollers are mounted in parallel rotation on the axle. When the caster is under load, the two rollers provide differential steering, which further improves the steering flexibility and stability of the non-marking caster of this utility model. It also has good steering flexibility and stability under heavy load.

[0022] 6. When the caster is under load, the two arm plates on the second bracket rotate around the hinge point at the rear end until the lower end of the support arm is inserted into and abuts the bottom of the limiting groove on the corresponding arm plate. When the second bracket stops rotating, the support arm and the limiting groove constitute the limiting and anti-rotation mechanism between the first bracket and the second bracket, ensuring the stability of the non-marking caster under load.

[0023] 7. The mounting plate and shaft are rotatably connected to the mounting sleeve on bracket one through thrust bearings and cylindrical roller bearings, ensuring good rotational flexibility and quiet operation when bracket one rotates relative to the mounting plate. Attached Figure Description

[0024] Figure 1 This is a three-dimensional view of the left front side of a non-marking caster with good silent cushioning performance in Example 1;

[0025] Figure 2 This is a three-dimensional view of the left rear side of a non-marking caster with good silent buffering performance in Example 1;

[0026] Figure 3 This is a longitudinal sectional view along the front-to-back direction of a non-marking caster with good silent cushioning performance in Example 1;

[0027] Figure 4 yes Figure 3 A magnified view of the area at point S in the middle;

[0028] Figure 5 This is a longitudinal sectional view along the left-right direction of a non-marking caster with good silent cushioning performance in Example 1;

[0029] Figure 6 yes Figure 5 A magnified view of the middle T section;

[0030] Figure 7 This is a diagram showing the disassembled state of bracket one and bracket two in Example 1;

[0031] Figure 8 This is an assembly diagram of the mounting plate, bracket one, and bracket two in Example 1;

[0032] Figure 9 This is a perspective view from the right side of a non-marking caster with good silent cushioning performance in Example 2;

[0033] Figure 10This is a three-dimensional view of the left rear side of a non-marking caster with good silent and buffering performance in Example 2;

[0034] Figure 11 This is a longitudinal sectional view along the front-to-back direction of a non-marking caster with good silent cushioning performance in Example 2;

[0035] Figure 12 This is a longitudinal sectional view along the left and right directions of a non-marking caster with good silent cushioning performance in Example 2;

[0036] Figure 13 This is a diagram showing the disassembled state of bracket one and bracket two in embodiment 2;

[0037] Figure 14 This is an assembly diagram of bracket one and bracket two in Example 2.

[0038] In the diagram: 1. Mounting plate; 2. Bracket 1; 3. Bracket 2; 4. Bolt assembly; 5. Roller; 6. Wheel and axle assembly; 7. Longitudinal damping assembly; 8. Screw; 9. Thrust bearing; 10. Cylindrical roller bearing; 1-1. Shaft; 1-2. Annular mounting plate; 1-3. Nut 1; 1-4. Washer; 2-1. Top plate; 2-1a. Ear plate 1; 2-2. Arm plate 1; 2-2a. Support arm; 2-3. Mounting sleeve ; 2-4, Connecting plate two; 3-1, Arm plate two; 3-1a, Ear plate two; 3-1b, Limiting groove; 3-2, Connecting plate one; 5-1, Wheel hub; 5-2, Tire; 6-1, Rotating shaft; 6-2, Locking nut assembly; 6-3, Spacer; 7-1, Screw; 7-1a, End cap; 7-1b, Nut two; 7-2, Spring; 7-3, Shock absorber sleeve; 7-3a, Annular base plate; 7-4, Annular gasket. Detailed Implementation

[0039] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0040] Example 1

[0041] like Figures 1-8As shown, a quiet, non-marking caster with good cushioning performance includes a mounting plate 1, a first bracket 2, a second bracket 3, a roller 5, and a wheel axle assembly 6. The first bracket 2 includes a top plate 2-1 and two arm plates 2-2. One arm plate 2-2 is fixed to the lower left side of the top plate 2-1, and the other arm plate 2-2 is correspondingly fixed to the lower right side of the top plate 2-1. The mounting plate 1 is rotatably mounted on the upper side of the top plate 2-1 of the first bracket 2. The lower ends of the two arm plates 2-2 are respectively hinged to a forward-extending arm plate 3. -1, the rear ends of the two arm plates 3-1 are fixedly connected together by the connecting plate 3-2 to form the bracket 3. The roller 5 is rotatably mounted on the inner front end of the two arm plates 3-1 through the wheel axle assembly 6. The roller 5 includes a hub 5-1 rotatably mounted on the wheel axle assembly 6 and a tire 5-2 sleeved on the outer peripheral side of the hub 5-1. The tire 5-2 is made of flexible polymer material. A longitudinal shock absorption assembly 7 is provided between the front end of one or two arm plates 3-1 and the front end of the top plate 2-1.

[0042] Preferably, the longitudinal damping component 7 includes a screw 7-1 longitudinally fixedly installed at the front end of the second arm plate 3-1 and the front end of the top plate 2-1, and the screw 7-1 corresponds to the wheel axle assembly 6. A spring 7-2 and a damping sleeve 7-3 are sequentially sleeved on the screw 7-1 from the inside to the outside. The lower end of the spring 7-2 abuts against the front end of the corresponding second arm plate 3-1, and the upper end abuts against the front end of the top plate 2-1. The lower end of the damping sleeve 7-3 is placed at the front end of the corresponding second arm plate 3-1, and a buffer gap is left between the upper end and the lower side of the front end of the top plate 2-1.

[0043] More preferably, the top plate 2-1 has two ear plates 2-1a located at the top corners at its front end, and the two arm plates 3-1 each have ear plates 3-1a extending horizontally outward from the support 3. The longitudinal damping assembly 7 includes two sets: one set is fixed between a set of corresponding ear plates 2-1a and 3-1a on the left side, and the other set is fixed between a set of corresponding ear plates 2-1a and 3-1a on the right side. The screw 7-1 on the longitudinal damping assembly 7 passes through... Inside the mounting holes on a set of corresponding ear plates 2-1a and 3-1a, the end cap 7-1a at one end of the screw 7-1 is snapped onto either ear plate 2-1a or ear plate 3-1a. The other end of the screw 7-1 passes through the mounting hole on either ear plate 2-1a or ear plate 3-1a and is screwed with a nut 7-1b. The lower end of the spring 7-2 abuts against the upper side of the corresponding ear plate 3-1a and the upper end abuts against the lower side of the corresponding ear plate 2-1a. The lower end of the shock-absorbing sleeve 7-3 is placed on the upper side of the corresponding ear plate 3-1a.

[0044] More preferably, the lower end of the shock-absorbing sleeve 7-3 is integrally formed with an annular base plate 7-3a extending to its inner circumference. The longitudinal shock-absorbing component 7 also includes an annular gasket 7-4 laid on the upper side of the annular base plate 7-3a. The screw 7-1 passes through the central hole of both the annular base plate 7-3a and the annular gasket 7-4. The lower end of the spring 7-2 abuts against the annular gasket 7-4.

[0045] More preferably, the wheel axle assembly 6 includes a rotating shaft 6-1 that passes through the front ends of the two arm plates 3-1 and a locking nut assembly 6-2 that is screwed onto the end of the rotating shaft 6-1 and securely locked to the front ends of the two arm plates 3-1. Two rollers 5 are rotatably mounted on the rotating shaft 6-1, and a spacer 6-3 for separating the two rollers 5 is also passed through the middle of the rotating shaft 6-1. The two ends of the spacer 6-3 abut against the inner rings of the bearings inside the two rollers 5. The shock-absorbing sleeve 7-3 and the tire 5-2 are both made of polyurethane.

[0046] More preferably, the rear end of the second arm plate 3-1 and the lower end of the corresponding first arm plate 2-2 are hinged together by bolt assemblies 4 that pass through the corresponding mounting holes on both.

[0047] More preferably, a mounting sleeve 2-3 is fixedly provided on the upper side of the top plate 2-1, and a shaft 1-1 extending downward is fixedly provided at the center of the mounting plate 1. The lower end of the shaft 1-1 passes through the mounting sleeve 2-3 and the central hole on the top plate 2-1 in sequence and extends to the lower side of the top plate 2-1. A nut 1-3 is screwed onto the threaded section at the lower end of the shaft 1-1, and a washer 1-4 located between the top plate 2-1 and the nut 1-3 is sleeved on the lower end of the shaft 1-1.

[0048] The upper end of the mounting sleeve 2-3 and the lower side of the mounting plate 1 are rotatably connected by a thrust bearing 9, and the lower end of the mounting sleeve 2-3 is rotatably connected to the lower end of the shaft 1-1 by a cylindrical roller bearing 10.

[0049] More preferably, the upper end of the shaft 1-1 is inserted through and welded to the center hole of the mounting plate 1, and the upper end of the shaft 1-1 also has an annular mounting plate 1-2 extending horizontally outward, and the annular mounting plate 1-2 is attached and fixed to the lower side of the mounting plate 1.

[0050] More preferably, the mounting plate 1 and the annular mounting plate 1-2 are provided with corresponding mounting holes, and the upper end of the mounting hole on the mounting plate 1 is provided with a countersunk groove. The mounting plate 1 and the annular mounting plate 1-2 are fixedly connected together by screws 8 that pass through the corresponding mounting holes on the two, and the end cap at the upper end of the screw 8 is embedded in the countersunk groove at the upper end of the mounting hole on the mounting plate 1.

[0051] Example 2

[0052] like Figures 9-14 As shown, a quiet, non-marking caster with good cushioning performance includes a mounting plate 1, a first bracket 2, a second bracket 3, a roller 5, and a wheel axle assembly 6. The first bracket 2 includes a top plate 2-1 and two arm plates 2-2. One arm plate 2-2 is fixed to the lower left side of the top plate 2-1, and the other arm plate 2-2 is correspondingly fixed to the lower right side of the top plate 2-1. The mounting plate 1 is rotatably mounted on the upper side of the top plate 2-1 of the first bracket 2. The lower ends of the two arm plates 2-2 are respectively hinged to a forward-extending arm plate 3. -1, the rear ends of the two arm plates 3-1 are fixedly connected together by a connecting plate 3-2 to form the bracket 3. The roller 5 is rotatably mounted on the inner front end of the two arm plates 3-1 via a wheel axle assembly 6. The roller 5 includes a hub 5-1 rotatably mounted on the wheel axle assembly 6 and a tire 5-2 sleeved on the outer peripheral side of the hub 5-1. The tire 5-2 is made of flexible polymer material. A longitudinal shock absorption assembly 7 is provided between the front end of one or two arm plates 3-1 and the front end of the top plate 2-1. Specifically, the tire 5-2 may be coated with rubber on the outer peripheral side of the hub 5-1.

[0053] Preferably, the longitudinal damping component 7 includes a screw 7-1 longitudinally fixedly installed at the front end of the second arm plate 3-1 and the front end of the top plate 2-1. A spring 7-2 and a damping sleeve 7-3 are sequentially sleeved on the screw 7-1 from the inside to the outside. The lower end of the spring 7-2 abuts against the front end of the corresponding second arm plate 3-1, and the upper end abuts against the front end of the top plate 2-1. The lower end of the damping sleeve 7-3 is placed at the front end of the corresponding second arm plate 3-1, and a buffer gap is left between the upper end and the lower side of the front end of the top plate 2-1.

[0054] More preferably, the top plate 2-1 has two ear plates 2-1a located at the top corners at its front end, and the two arm plates 3-1 each have ear plates 3-1a extending horizontally outward from the support 3. The longitudinal damping assembly 7 includes two sets: one set is fixed between a set of corresponding ear plates 2-1a and 3-1a on the left side, and the other set is fixed between a set of corresponding ear plates 2-1a and 3-1a on the right side. The screw 7-1 on the longitudinal damping assembly 7 passes through... Inside the mounting holes on a set of corresponding ear plates 2-1a and 3-1a, the end cap 7-1a at one end of the screw 7-1 is snapped onto either ear plate 2-1a or ear plate 3-1a. The other end of the screw 7-1 passes through the mounting hole on either ear plate 2-1a or ear plate 3-1a and is screwed with a nut 7-1b. The lower end of the spring 7-2 abuts against the upper side of the corresponding ear plate 3-1a and the upper end abuts against the lower side of the corresponding ear plate 2-1a. The lower end of the shock-absorbing sleeve 7-3 is placed on the upper side of the corresponding ear plate 3-1a.

[0055] More preferably, the wheel axle assembly 6 includes a rotating shaft 6-1 passing through the front ends of the two arm plates 3-1 and a locking nut assembly 6-2 screwed onto the end of the rotating shaft 6-1 and fixing it to the front ends of the two arm plates 3-1. The roller 5 is rotatably mounted in the middle of the rotating shaft 6-1. The shock-absorbing sleeve 7-3 and the tire 5-2 are both made of polyurethane. Specifically, the locking nut assembly 6-2 includes a locking nut screwed onto the end of the rotating shaft 6-1 and a washer sleeved on the end of the rotating shaft 6-1 and located inside the locking nut.

[0056] More preferably, the rear end of the second arm plate 3-1 and the lower end of the corresponding first arm plate 2-2 are hinged together by bolt assemblies 4 that pass through the corresponding mounting holes on both.

[0057] More preferably, both arm plates 3-1 are located inside the support 2. The upper edge of each arm plate 3-1 has an upward-opening limiting groove 3-1b in the middle. The front vertical edge of the arm plate 2-2 has a support arm 2-2a that extends downward into the support 2. The lower end of the support arm 2-2a is inserted into the limiting groove 3-1b on the corresponding side of the arm plate 3-1. The upper ends of the rear edges of the two arm plates 2-2 are welded and fixedly connected to the rear edge of the top plate 2-1 by a connecting plate 2-4.

[0058] More preferably, a mounting sleeve 2-3 is fixedly provided on the upper side of the top plate 2-1, and a shaft 1-1 extending downward is fixedly provided at the center of the mounting plate 1. The lower end of the shaft 1-1 passes through the mounting sleeve 2-3 and the central hole on the top plate 2-1 in sequence and extends to the lower side of the top plate 2-1. A nut 1-3 is screwed onto the threaded section at the lower end of the shaft 1-1, and a washer 1-4 located between the top plate 2-1 and the nut 1-3 is sleeved on the lower end of the shaft 1-1.

[0059] The upper end of the mounting sleeve 2-3 and the lower side of the mounting plate 1 are rotatably connected by a thrust bearing 9, and the lower end of the mounting sleeve 2-3 is rotatably connected to the lower end of the shaft 1-1 by a cylindrical roller bearing 10.

[0060] More preferably, the upper end of the shaft 1-1 is threaded through and welded to the center hole of the mounting plate 1.

[0061] This utility model discloses a silent, cushioning, and non-marking caster. The bracket is formed by hinged connection of bracket one and bracket two. A longitudinal shock-absorbing component is provided between the top plate on bracket one and the front end of the arm plate two on bracket two, which gives the caster excellent shock absorption and cushioning performance during load-bearing walking, allowing it to travel smoothly even on uneven ground. A flexible polymer tire is fitted on the outer circumference of the wheel hub on the roller, allowing the caster to use the elastic deformation of the tire to reduce the instantaneous impact of the caster on the ground during load-bearing walking, avoiding excessive impact that could damage the ground. The tire can also make flexible contact with the ground while maintaining friction, avoiding hard scraping and wear on the tire, extending the service life of the caster, and also has excellent performance in terms of quiet noise reduction and leaving no marks when walking.

[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A non-marking caster with good silent and cushioning performance, characterized in that, The system includes a mounting plate (1), a bracket one (2), a bracket two (3), rollers (5), and a wheel axle assembly (6). The bracket one (2) includes a top plate (2-1) and two arm plates one (2-2). One arm plate one (2-2) is fixed to the lower left side of the top plate (2-1), and the other arm plate one (2-2) is correspondingly fixed to the lower right side of the top plate (2-1). The mounting plate (1) is rotatably mounted on the upper side of the top plate (2-1) of the bracket one (2). The lower ends of the two arm plates one (2-2) are respectively hinged to an arm plate two (3-1) extending forward. The rear ends of the second arm plate (3-1) are fixedly connected together by the first connecting plate (3-2) to form the second bracket (3). The roller (5) is rotatably mounted on the inner front end of the two second arm plates (3-1) through the wheel axle assembly (6). The roller (5) includes a hub (5-1) rotatably mounted on the wheel axle assembly (6) and a tire (5-2) sleeved on the outer peripheral side of the hub (5-1). The tire (5-2) is made of flexible polymer material. A longitudinal shock absorption assembly (7) is provided between the front end of one or two second arm plates (3-1) and the front end of the top plate (2-1).

2. The silent, cushioning, non-marking caster as described in claim 1, characterized in that, The longitudinal damping assembly (7) includes a screw (7-1) that is longitudinally fixedly installed at the front end of the second arm plate (3-1) and the front end of the top plate (2-1). The screw (7-1) corresponds to the wheel axle assembly (6). A spring (7-2) and a damping sleeve (7-3) are sequentially sleeved on the screw (7-1) from the inside to the outside. The lower end of the spring (7-2) abuts against the front end of the corresponding second arm plate (3-1), and the upper end abuts against the front end of the top plate (2-1). The lower end of the damping sleeve (7-3) is placed at the front end of the corresponding second arm plate (3-1), and a buffer gap is left between the upper end and the lower side of the front end of the top plate (2-1).

3. The silent, cushioning, non-marking caster as described in claim 2, characterized in that, The top plate (2-1) has two ear plates (2-1a) located at the top corners at its front end. The two arm plates (3-1) each have ear plates (3-1a) extending horizontally outward from the support (3) at their front ends. The longitudinal damping assembly (7) includes two sets. One set of the longitudinal damping assembly (7) is fixed between a set of corresponding ear plates (2-1a) and ear plates (3-1a) located on the left side. The other set of the longitudinal damping assembly (7) is fixed between a set of corresponding ear plates (2-1a) and ear plates (3-1a) located on the right side. The screw (7-1) on the longitudinal damping assembly (7) passes through a set of Inside the mounting holes corresponding to ear plate one (2-1a) and ear plate two (3-1a), the end cap (7-1a) at one end of the screw (7-1) is engaged with one of ear plate one (2-1a) or ear plate two (3-1a). The other end of the screw (7-1) passes through the mounting hole on the other of ear plate one (2-1a) or ear plate two (3-1a) and is screwed with nut two (7-1b). The lower end of the spring (7-2) abuts against the upper side of the corresponding ear plate two (3-1a) and the upper end abuts against the lower side of the corresponding ear plate one (2-1a). The lower end of the shock-absorbing sleeve (7-3) is placed on the upper side of the corresponding ear plate two (3-1a).

4. The silent, cushioning, non-marking caster as described in claim 3, characterized in that, The lower end of the shock-absorbing sleeve (7-3) is integrally formed with an annular base plate (7-3a) extending to its inner circumference. The longitudinal shock-absorbing component (7) also includes an annular gasket (7-4) laid on the upper side of the annular base plate (7-3a). The screw (7-1) passes through the central hole of both the annular base plate (7-3a) and the annular gasket (7-4). The lower end of the spring (7-2) abuts against the annular gasket (7-4).

5. The silent, cushioning, non-marking caster as described in claim 4, characterized in that, The wheel axle assembly (6) includes a rotating shaft (6-1) that passes through the front ends of the two arm plates (3-1) and a locking nut assembly (6-2) that is screwed onto the end of the rotating shaft (6-1) and locks it to the front ends of the two arm plates (3-1). Two rollers (5) are rotatably mounted on the rotating shaft (6-1), and a spacer (6-3) for separating the two rollers (5) passes through the middle of the rotating shaft (6-1). The two ends of the spacer (6-3) abut against the inner rings of the bearings inside the two rollers (5). The shock-absorbing sleeve (7-3) and the tire (5-2) are both made of polyurethane.

6. The silent, cushioning, non-marking caster as described in claim 5, characterized in that, The rear end of the second arm plate (3-1) and the lower end of the corresponding first arm plate (2-2) are hinged together by bolt assemblies (4) that pass through the corresponding mounting holes on both.

7. The silent, cushioning, non-marking caster as described in claim 6, characterized in that, Both of the two arm plates (3-1) are located inside the bracket (2). The upper edge of the two arm plates (3-1) has an upward-opening limiting groove (3-1b) in the middle. The front vertical edge of the arm plate (2-2) has a support arm (2-2a) that extends into the lower side of the bracket (2). The lower end of the support arm (2-2a) is inserted into the limiting groove (3-1b) on the corresponding side of the arm plate (3-1). The upper end of the rear edge of the two arm plates (2-2) is welded and fixed to the rear edge of the top plate (2-1) by the connecting plate (2-4).

8. The silent, cushioning, non-marking caster as described in any one of claims 1 to 7, characterized in that, A mounting sleeve (2-3) is fixedly provided on the upper side of the top plate (2-1). A shaft (1-1) extending downward is fixedly provided at the center of the mounting plate (1). The lower end of the shaft (1-1) passes through the mounting sleeve (2-3) and the center hole on the top plate (2-1) in sequence and extends to the lower side of the top plate (2-1). A nut (1-3) is screwed onto the threaded section at the lower end of the shaft (1-1). A washer (1-4) is sleeved between the top plate (2-1) and the nut (1-3) at the lower end of the shaft (1-1). The upper end of the mounting sleeve (2-3) and the lower side of the mounting plate (1) are rotatably connected by a thrust bearing (9), and the lower end of the mounting sleeve (2-3) is rotatably connected to the lower end of the shaft (1-1) by a cylindrical roller bearing (10).

9. The silent, cushioning, non-marking caster as described in claim 8, characterized in that, The upper end of the shaft (1-1) is inserted through and welded to the center hole of the mounting plate (1); or, the upper end of the shaft (1-1) is inserted through and welded to the center hole of the mounting plate (1), and the upper end of the shaft (1-1) also has an annular mounting plate (1-2) extending horizontally to the outer periphery, and the annular mounting plate (1-2) is attached and fixed to the lower side of the mounting plate (1).

10. The silent, cushioning, non-marking caster as described in claim 9, characterized in that, The mounting plate (1) and the annular mounting plate (1-2) are provided with corresponding mounting holes, and the upper end of the mounting hole on the mounting plate (1) is provided with a countersunk groove. The mounting plate (1) and the annular mounting plate (1-2) are fixedly connected together by screws (8) that pass through the corresponding mounting holes on the two, and the end cap on the upper end of the screw (8) is embedded in the countersunk groove at the upper end of the mounting hole on the mounting plate (1).

Images