Universal trundle convenient to manufacture

Abstract

The invention relates to the technical field of trundles, and particularly discloses a universal trundle convenient to manufacture, which comprises a top plate, an upper cover, an upper ball, an upper wave plate, a bracket, a lower ball, a lower wave plate, a fixed part and a trundle body, the support comprises a support base and two supporting arms, and the wheel body is arranged between the two supporting arms and rotationally connected with the two supporting arms. The top plate, the upper cover, the upper wave disc, the support base and the lower wave disc are sequentially arranged from top to bottom. The upper ball is arranged between the upper cover and the upper wave plate, and the upper cover and the upper wave plate clamp the upper ball; a lower annular groove is formed in the top surface of the lower wave disc, the lower ball is arranged between the support base and the lower wave disc, the lower ball is embedded in the lower annular groove, and the support base and the lower wave disc clamp the lower ball; the fixing piece penetrates through the top plate, the upper cover, the upper wave disc, the support base and the lower wave disc and fixes the top plate, the upper cover and the lower wave disc together. Annular grooves for positioning the balls do not need to be formed in the support and the top plate, and the universal trundle is easy to manufacture and form.

Description

Technical Field

[0001] The present invention relates to the technical field of casters, and in particular to a universal caster that is easy to manufacture. Background Art

[0002] A universal caster is a caster that can rotate freely in the horizontal direction to meet the movement requirements of a vehicle in various directions and facilitate the movement of the vehicle. To ensure smooth steering, traditional universal casters are equipped with two sets of ball bearings and cooperate with a wave plate to form a bearing structure.

[0003] For example, the Chinese invention patent with the publication number CN214647347U discloses a similar universal caster. In this patent document, annular grooves need to be machined on both the bracket and the top plate to position the ball bearings. When it is necessary to increase the load-bearing capacity of the caster, both the top plate and the bracket will be made relatively thick. In this case, it will be very difficult to machine grooves on the top plate and the bracket, thereby increasing the difficulty of manufacturing the caster. Summary of the Invention

[0004] The present invention provides a universal caster that is easy to manufacture, without the need to open annular grooves for positioning ball bearings on the bracket and the top plate, and is easy to form the universal caster.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] An embodiment of the present invention provides a universal caster that is easy to manufacture, including a top plate, an upper cover, upper ball bearings, an upper wave plate, a bracket, lower ball bearings, a lower wave plate, a fixing member, and a wheel body; the bracket includes a bracket seat and two support arms, and the wheel body is disposed between the two support arms and rotatably connected to the two support arms; the top plate, the upper cover, the upper wave plate, the bracket seat, and the lower wave plate are sequentially arranged from top to bottom; the upper ball bearings are disposed between the upper cover and the upper wave plate, and the upper cover and the upper wave plate clamp the upper ball bearings; the top surface of the lower wave plate is provided with a lower annular groove, the lower ball bearings are disposed between the bracket seat and the lower wave plate, and the lower ball bearings are embedded in the lower annular groove, and the bracket seat and the lower wave plate clamp the lower ball bearings; the fixing member passes through the top plate, the upper cover, the upper wave plate, the bracket seat, and the lower wave plate and fixes the top plate, the upper cover, and the lower wave plate together.

[0007] In some embodiments, the bottom surface of the upper cover is provided with an upper cover annular groove, the top surface of the upper wave plate is provided with an upper annular groove, and the upper ball bearings are embedded in the upper cover annular groove and the upper annular groove.

[0008] In some embodiments, the top surface of the upper wave plate is provided with an annular protrusion, the periphery of the upper wave plate is provided with a wave plate border extending upward, the wave plate border is located outside the annular protrusion, and the upper annular groove is formed between the wave plate border and the annular protrusion.

[0009] In some embodiments, a peripheral edge of the upper cover is provided with a downwardly extending upper cover border, and the upper cover border is located outside the upper wave plate.

[0010] In some embodiments, a bottom surface of the top plate is provided with a top plate annular groove, and a top surface of the upper cover is provided with an upper cover protrusion adapted to the top plate annular groove, and the upper cover protrusion is embedded in the top plate annular groove.

[0011] In some embodiments, the support base is provided with a through support opening, a limiting convex ring is arranged around the support opening on a top surface of the support base, the upper wave plate is provided with a wave plate opening adapted to the limiting convex ring, and the limiting convex ring is inserted into the wave plate opening.

[0012] In some embodiments, the fixing member is a rivet, or the fixing member includes a screw and a nut sleeved on the screw.

[0013] In some embodiments, a brake assembly is further fixed on the support. The brake assembly includes a brake pedal, a brake release pedal and a braking assembly. The braking assembly includes an integrally formed intermediate plate, a brake plate and an elastic member. The intermediate plate is rotatably connected to the support. The brake plate is located at one end of the intermediate plate. The elastic member abuts against the support. The intermediate plate can be rotated to a braking state where the brake plate abuts against the wheel body and a brake release state where the brake plate is separated from the wheel body. The brake release pedal is rotatably connected to both the support and the brake pedal, and a locking structure is arranged on the brake release pedal. The brake pedal is rotatably connected to one end of the intermediate plate where the brake plate is located, and the brake pedal includes a fitting adapted to the locking structure. When the brake pedal is stepped on, the brake pedal can drive the intermediate plate to rotate from the brake release state to the braking state, and when the intermediate plate is in the braking state, the fitting is in locking cooperation with the locking structure to keep the intermediate plate in the braking state. When the fitting is separated from the locking structure, a restoring force applied by the elastic member to the intermediate plate pushes the intermediate plate and the brake pedal to reset.

[0014] In some embodiments, dust covers are arranged on both sides of the wheel body, and the dust covers are located between the support arm and the wheel body.

[0015] In some embodiments, an outer side surface of the dust cover includes a flat portion located at a central position thereof. A convex platform is arranged on the flat portion, and a through hole penetrating the dust cover is arranged on the convex platform. The support arm abuts against the convex platform.

[0016] The present invention has at least the following beneficial effects: The upper ball is arranged between the upper cover and the upper wave plate, and the upper cover and the upper wave plate clamp the upper ball; The top surface of the lower wave plate is provided with a lower annular groove, the lower ball is arranged between the support seat and the lower wave plate, and the lower ball is embedded in the lower annular groove, and the support seat and the lower wave plate clamp the lower ball; Therefore, there is no need to open an annular groove for positioning the ball on the support and the top plate, which reduces the difficulty of processing the support and the top plate and is conducive to the manufacturing and molding of the universal caster. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Structural schematic diagram of a universal caster facilitating manufacturing according to an embodiment of the present invention;

[0018] Figure 2 Partial cross-sectional schematic diagram of a universal caster facilitating manufacturing according to an embodiment of the present invention;

[0019] Figure 3 Partial exploded schematic diagram of a universal caster facilitating manufacturing according to an embodiment of the present invention;

[0020] Figure 4 Structural schematic diagram of the upper cover observed from the lower perspective according to an embodiment of the present invention;

[0021] Figure 5 Structural schematic diagram of the caster when not braked according to an embodiment of the present invention;

[0022] Figure 6 is Figure 5 Cross-sectional schematic diagram of the caster shown;

[0023] Figure 7 Structural schematic diagram of the caster when braked according to an embodiment of the present invention;

[0024] Figure 8 is Figure 7 Cross-sectional schematic diagram of the caster shown;

[0025] Figure 9 Structural schematic diagram of the brake pedal, brake release pedal and braking assembly according to an embodiment of the present invention;

[0026] Figure 10 Structural schematic diagram of the brake release pedal according to an embodiment of the present invention;

[0027] Figure 11 Structural schematic diagram of the brake pedal according to an embodiment of the present invention;

[0028] Figure 12 Structural schematic diagram of the braking assembly according to an embodiment of the present invention;

[0029] Figure 13 Partial cross-sectional schematic diagram of a universal caster facilitating manufacturing according to another embodiment of the present invention;

[0030] Figure 14 This is a schematic structural diagram of a dust cover according to another embodiment of the present invention.

[0031] Among them, the reference numerals are:

[0032] Wheel body 100, dust cover 130, flat portion 131, boss 132, through hole 133, screw 150, nut 160;

[0033] Bracket 200, bracket seat 210, bracket opening 211, limit convex ring 212, support arm 220, top plate 230, upper cover 240, upper cover ring groove 241, upper cover border 242, upper cover protrusion 243, upper ball 250, upper wave plate 260, upper cover ring groove 261, annular protrusion 262, wave plate border 263, wave plate opening 264, lower ball 270, lower wave plate 280, lower ring groove 281, fixing member 290;

[0034] Brake assembly 300, brake pedal 310, adapter 311, first plane 312, connecting arm 313, avoidance groove 314;

[0035] Release brake pedal 320, locking structure 321, second plane 322, arc guiding surface 323, locking baffle 324, connecting block 325, release brake seat 326, third plane 327;

[0036] Braking assembly 330, intermediate plate 331, brake plate 332, elastic member 333, lug 334. Detailed implementation manners

[0037] The present invention provides the following description with reference to the drawings to help a comprehensive understanding of various embodiments of the present invention as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present invention.

[0038] In the description of the present invention, when it comes to orientation description, for example, the orientations or positional relationships indicated by up, down, front, back, left, right, etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0039] It should be understood that when an element (for example, the first element) is "connected" to another element (for example, the second element), the element can be directly connected to the other element, or there can be an intermediate element (for example, the third element) between the element and the other element.

[0040] An embodiment of the present invention provides a universal caster that is easy to manufacture. As Figures 1-3 shown, it includes a top plate 230, an upper cover 240, upper ball bearings 250, an upper wave plate 260, a bracket 200, lower ball bearings 270, a lower wave plate 280, a fixing member 290, and a wheel body 100. The bracket 200 includes a bracket base 210 and two support arms 220. The two support arms 220 extend below the bracket base 210. The wheel body 100 is disposed between the two support arms 220 and is rotatably connected to the two support arms 220. The entire caster moves on the ground by the rotation of the wheel body 100. The top plate 230 is used to be fixed on a vehicle. Therefore, the bracket 200 needs to be rotatable relative to the top plate 230 to achieve the steering movement of the vehicle.

[0041] The top plate 230, the upper cover 240, the upper wave plate 260, the bracket base 210, and the lower wave plate 280 are sequentially arranged from top to bottom. The upper ball bearings 250 are disposed between the upper cover 240 and the upper wave plate 260, and the upper cover 240 and the upper wave plate 260 clamp the upper ball bearings 250. The top surface of the lower wave plate 280 is provided with a lower annular groove 281. The lower ball bearings 270 are disposed between the bracket base 210 and the lower wave plate 280, and the lower ball bearings 270 are embedded in the lower annular groove 281. The bracket base 210 and the lower wave plate 280 clamp the lower ball bearings 270. The fixing member 290 passes through the top plate 230, the upper cover 240, the upper wave plate 260, the bracket base 210, and the lower wave plate 280 and fixes the top plate 230, the upper cover 240, and the lower wave plate 280 together. Thus, the upper cover 240 and the upper wave plate 260 can achieve relative rotation through the upper ball bearings 250. The bracket base 210 and the lower wave plate 280 can achieve relative rotation through the lower ball bearings 270, and the top plate 230 can rotate relative to the bracket 200 to realize the change of the moving direction.

[0042] In this embodiment, the upper cover 240 and the upper wave plate 260 directly clamp the upper ball bearings 260; the top surface of the lower wave plate 280 is provided with a lower annular groove 281. The lower ball bearings 270 are disposed between the bracket base 210 and the lower wave plate 280, and the lower ball bearings 270 are embedded in the lower annular groove 281. The bracket base 210 and the lower wave plate 280 clamp the lower ball bearings 270. Therefore, there is no need to open annular grooves for positioning the ball bearings on the bracket 200 and the top plate 230, which reduces the processing difficulty of the bracket 200 and the top plate 230, is easy to form the universal caster, and the bracket 200 and the top plate 230 can be made thicker, and relatively can improve the bearing capacity of the caster.

[0043] In some embodiments, as Figures 2-4As shown, the bottom surface of the upper cover 240 is provided with an upper cover annular groove 241, the top surface of the upper wave plate 260 is provided with an upper annular groove 261, and the upper ball 250 is embedded in the upper cover annular groove 241 and the upper annular groove 261. In this embodiment, the upper ball 250 is positioned by the upper cover annular groove 241 and the upper annular groove 261, and the upper ball 250 is restricted from being separated from the upper cover annular groove 241 or the upper annular groove 261, so that the upper cover 240 and the upper wave plate 260 can maintain a state of being relatively rotatable to each other, ensuring that the caster can turn smoothly.

[0044] Furthermore, an annular protrusion 262 is provided on the top surface of the upper wave disc 260, and an upwardly extending wave disc rim 263 is provided on the periphery of the upper wave disc 260, the wave disc rim 263 is located outside the annular protrusion 262, and an upper annular groove 261 is formed between the wave disc rim 263 and the annular protrusion 262. The annular protrusion 262 can limit the upper ball 250 from moving radially inward, and the wave disc rim 263 can limit the upper ball 250 from moving radially outward.

[0045] In this embodiment, the upper wave plate 260, the annular protrusion 262 and the wave plate surrounding edge 263 can be integrally formed, which is convenient for overall manufacturing and can also enhance the connection strength.

[0046] In some embodiments, the upper cover 240 is provided with an upper cover edge 242 extending downward, and the upper cover edge 242 is located outside the upper wave plate 260. This allows the upper cover 240 to be covered outside the upper wave plate 260, hiding the upper wave plate 260 and the upper ball 250 inside, playing a role in dust protection for the upper wave plate 260 and the upper ball 250, ensuring that the upper ball 250 can roll smoothly, and extending the service life.

[0047] In some embodiments, the bottom surface of the top plate 230 is provided with a top plate annular groove, and the top surface of the upper cover 240 is provided with an upper cover protrusion 243 that matches the top plate annular groove, and the upper cover protrusion 243 is embedded in the top plate annular groove. Through the cooperation between the upper cover protrusion 243 and the top plate annular groove, the upper cover 240 is difficult to move horizontally relative to the top plate 230, and the two can maintain a synchronous rotation state, ensuring that the top plate 230 can rotate smoothly relative to the bracket seat 210.

[0048] A through opening may be provided at the center of the top plate 230 and the upper cover 240 for the fixing member 290 to pass through.

[0049] In some embodiments, the bracket base 210 is provided with a through bracket opening 211 through which the fixing member 290 passes. A limiting convex ring 212 is arranged around the bracket opening 211 on the top surface of the bracket base 210. The upper wave plate 260 is provided with a wave plate opening 264 adapted to the limiting convex ring 212 through which the fixing member 290 passes. The limiting convex ring 212 is inserted into the wave plate opening 264, and the inner side wall of the wave plate opening 264 will abut against the outer side wall of the limiting convex ring 212. The relative horizontal movement of the upper wave plate 260 with respect to the bracket base 210 is restricted through the cooperation of the limiting convex ring 212 and the wave plate opening 264, so that the upper wave plate 260 remains stable.

[0050] In some embodiments, the fixing member 290 is a rivet, and the top plate 230, the upper cover 240 and the lower wave plate 280 are riveted and fixed together by the rivet.

[0051] In some other embodiments, the fixing member includes a screw and a nut sleeved on the screw. The screw passes through the top plate 230, the upper cover 240, the upper wave plate 260, the bracket base 210 and the lower wave plate 280, and then the nut is tightened. The head of the screw and the nut can clamp and fix the top plate 230, the upper cover 240 and the lower wave plate 280.

[0052] The present invention also provides a universal caster that is easy to manufacture according to an embodiment. Figure 1 、 Figures 5-11 As shown in, a brake assembly 300 is further fixed on the bracket 200. The brake assembly 300 includes a bracket 200, a wheel body 100 rotatably connected to the bracket 200, a brake pedal 310, a brake release pedal 320 and a braking component 330. The brake pedal 310, the brake release pedal 320 and the braking component 330 are all arranged on the bracket 200, and both the brake pedal 310 and the brake release pedal 320 can be stepped on by the user. The braking component 330 includes an integrally formed middle plate 331, a brake plate 332 and an elastic member 333. The middle plate 331, the brake plate 332 and the elastic member 333 are made into one component to reduce the number of components. The middle plate 331 is rotatably connected to the bracket 200. The brake plate 332 is located at one end of the middle plate 331. The elastic member 333 abuts against the bracket 200, and the elastic member 333 can provide an elastic restoring force to the middle plate 331.

[0053] The middle plate 331 can be rotated to a braking state and a brake release state; when the middle plate 331 is in the braking state, as shown in Figure 3 and Figure 4 shown, the brake plate 332 abuts against the wheel body 100 to increase the resistance to the rotation of the wheel body 100 and restrict the rotation of the wheel body 100, playing a role in braking; when the middle plate 331 is in the brake release state, as shown in Figure 1 and Figure 2As shown, the brake plate 332 is separated from the wheel body 100, and it no longer restricts the rotation of the wheel body 100, thus releasing the brake, and the caster can move normally.

[0054] The brake release pedal 320 is rotatably connected to both the bracket 200 and the brake pedal 310. When the brake pedal 310 rotates, it can drive the brake release pedal 320 to rotate, and a locking structure 321 is provided on the brake release pedal 320; one end of the brake pedal 310 where the brake plate 332 is provided is rotatably connected to the intermediate plate 331. When the brake pedal 310 rotates, it can drive the intermediate plate 331 to rotate, and the brake pedal 310 includes a fitting 311 adapted to the locking structure 321.

[0055] When the brake pedal 310 is stepped on by the user, the states shown in Figure 3 and Figure 4 are formed. The brake pedal 310 can drive the intermediate plate 331 to rotate from the brake release state to the braking state to brake the wheel body 100. And when the intermediate plate 331 is in the braking state, the fitting 311 and the locking structure 321 are in locking cooperation to restrict the rotation of the intermediate plate 331, so that the intermediate plate 331 is kept in the braking state, and the entire caster can be in the braking state and will not be released casually.

[0056] When the brake release pedal 320 is stepped on by the user, under the action of an external force, the fitting 311 is forcibly separated from the locking structure 321. The fitting 311 and the locking structure 321 are no longer in locking cooperation and no longer restrict the rotation of the intermediate plate 331. The restoring force applied by the elastic member 333 to the intermediate plate 331 pushes the intermediate plate 331 to reset to the brake release state, and correspondingly also drives the brake pedal 310 to reset to the initial state that can be stepped on by the user.

[0057] Therefore, this embodiment can realize the function of braking by stepping on the brake pedal 310 and can also release the braking state by stepping on the brake release pedal 320. And this embodiment mainly relies on the brake pedal 310, the brake release pedal 320 and the braking assembly 330 to realize the braking and brake release functions. The braking assembly 330 includes an integrally formed intermediate plate 331, a brake plate 332 and an elastic member 333. Thus, the components of the entire caster are greatly reduced, the structure can be simplified, and the assembly is convenient.

[0058] In some embodiments, as shown in Figures 7-10 , the locking structure 321 is a locking groove. When the fitting 311 is inserted into the locking groove, the fitting 311 and the locking structure 321 are in locking cooperation. When the fitting 311 disengages from the locking groove, the fitting 311 and the locking structure 321 are separated.

[0059] The locking groove has the advantage of being easy to process and manufacture, and the adapter 311 is easy to insert into or detach from the locking groove, thereby ensuring that the adapter 311 and the locking structure 321 can be smoothly locked and matched.

[0060] Furthermore, a first plane 312 is provided on the adapter 311, and a second plane 322 and an arc-shaped guide surface 323 are provided on the brake release pedal 320. The rotation axis of the brake release pedal 320 and the brake pedal 310 is coaxially arranged with the center of the arc-shaped guide surface 323, one side of the arc-shaped guide surface 323 is connected to the second plane 322, and the other side of the arc-shaped guide surface 323 is connected to the locking groove.

[0061] When the middle plate 331 is in the brake-released state, the first plane 312 is in close contact with the second plane 322. This state allows the first plane 312 and the second plane 322 to remain in close contact. In the absence of external force, the brake pedal 310 is difficult to rotate relative to the brake-release pedal 320, and the middle plate 331 will not switch to the brake state at will, thereby ensuring the normal travel of the caster.

[0062] When the middle plate 331 switches from the released state to the braked state, the first plane 312 slides along the arc-shaped guide surface 323. Guided by the arc-shaped guide surface 323, the adapter 311 is easier to move toward the locking groove, so that it can be inserted into the locking groove more smoothly.

[0063] Furthermore, the brake release pedal 320 includes a locking baffle 324 , and a third plane 327 is also provided on the brake release pedal 320 . The side of the arc guide surface 323 away from the second plane 322 is connected to the third plane 327 , and a locking groove is formed between the locking baffle 324 and the third plane 327 .

[0064] When the middle plate 331 switches from the brake-released state to the brake state, the first plane 312 first slides along the arc-shaped guide surface 323, and then slides along the third plane 327, and the adapter 311 is finally smoothly inserted into the locking groove, and the guiding effect is better. At the same time, since the third plane 327 is a plane, the first plane 312 can be closely attached to the third plane 327, and without the action of external force, the adapter 311 is difficult to automatically separate from the locking groove, and the middle plate 331 will not switch to the brake-released state at will, but will remain in the brake state.

[0065] In this embodiment, both the second plane 322 and the third plane 327 can be arranged tangent to the arc-shaped guide surface 323, so that the sliding of the adapter 311 is smoother.

[0066] In some embodiments, the brake release pedal 320 further includes a connecting block 325. The connecting block 325 is located on one side of the locking baffle 324. The second plane 322, the third plane 327, and the arc-shaped guiding surface 323 are all provided on the connecting block 325. The connecting block 325 is rotatably connected to the brake pedal 310.

[0067] The above-mentioned second plane 322, third plane 327, and arc-shaped guiding surface 323 are formed by the connecting block 325. The brake pedal 310 can be rotatably connected to both sides of the connecting block 325, preventing the connecting block 325 from moving along the rotation axis, and making the overall structure more compact.

[0068] In some embodiments, the brake release pedal 320 further includes a brake release seat 326. The brake release seat 326 is rotatably connected to the bracket 200. Both the connecting block 325 and the locking baffle 324 are connected to the bottom of the brake release seat 326. Thus, when the user steps on the brake pedal 310, the brake release pedal 320 can be driven to rotate.

[0069] In some embodiments, the locking groove can be an arc-shaped groove, the adapter 311 can be set as a wedge shape, and the head of the adapter 311 can be set as an arc shape adapted to the locking groove, so as to facilitate the insertion of the head of the adapter 311 into the locking groove.

[0070] In some embodiments, as Figure 7 , Figure 8 and Figure 11 shown, when the intermediate plate 331 is in the braking state, the brake release pedal 320 is located above the brake pedal 310. In this state, it is easier for the user to step on the brake release pedal 320, making it more convenient to use. At the same time, the brake pedal 310 is provided with an avoidance groove 314 through which the brake release pedal 320 can pass, to avoid interference during the relative rotation of the two.

[0071] As Figure 5 and Figure 6 shown, when the intermediate plate 331 is in the brake release state, the brake pedal 310 is located above the brake release pedal 320. In this state, it is easier for the user to step on the brake pedal 310, making it more convenient to use.

[0072] In some embodiments, as Figure 7 , Figure 8 and Figure 11 shown, the brake pedal 310 further includes two connecting arms 313. The upper ends of the two connecting arms 313 are rotatably connected to the brake release pedal 320, and the lower ends are rotatably connected to the intermediate plate 331. The adapter 311 is located between the two connecting arms 313 to protect the adapter 311.

[0073] Specifically, the upper ends of the two connecting arms 313 can be respectively rotatably connected to both sides of the connecting block 325.

[0074] In some embodiments, as Figure 7 、 Figure 8 and Figure 12 shown, the elastic member 333 is an elastically deformable elastic plate. One end of the elastic plate is connected to the intermediate plate 331, and the other end abuts against the bracket 200. An elastic restoring force is generated through the deformation of the elastic plate.

[0075] In some embodiments, as Figure 7 、 Figure 8 and Figure 12 shown, the brake pedal 310 is located above the intermediate plate 331. One end of the intermediate plate 331 where the brake plate 332 is provided has a lug 334 extending upward. The lug 334 is rotatably connected to the brake pedal 310, and specifically can be rotatably connected to the connecting arm 313 of the above embodiment. Thus, when the brake pedal 310 is stepped on by a user, the brake pedal 310 can drive the intermediate plate 331 to rotate.

[0076] The present invention also provides a universal caster that is easy to manufacture in an embodiment, Figure 13 and Figure 14 shown, dust covers 130 are provided on both sides of the wheel body 100. The dust covers 130 are located between the support arms 220 and the wheel body 100. The dust covers 130 can reduce the entry of dust and other impurities into the inner side of the wheel body 100, ensuring the smooth rotation of the caster, which is particularly applicable to use scenarios with a large amount of dust. The two support arms 220 can limit the dust covers 130 from both sides to prevent the dust covers 130 from falling off.

[0077] Furthermore, the outer side surface of the dust cover 130 includes a flat portion 131 located at its central position. The periphery of the flat portion 131 can be an arc portion. The flat portion 131 is a plane, and the arc portion is an arc surface. A boss 132 is provided on the flat portion 131. The boss 132 protrudes from the flat portion 131, and a through hole 133 penetrating the dust cover 130 is provided on the boss 131.

[0078] The assembly of the support arms 220 and the wheel body 100 usually relies on screws 150 and nuts 160. The screws 150 will pass through the through holes 133 of the two support arms 220, the two dust covers 130, and the wheel body 100. After tightening the screws 150 and nuts 160, the support arms 220 will closely adhere to the boss 132 to clamp the boss 132, causing the boss 132 to deform and concave inward. Thus, the peripheral position of the flat portion 131 will be more closely in contact with the support arms 220 of the bracket to further reduce the entry of dust and other impurities into the inner side of the wheel body 100 and improve the dust prevention effect.

[0079] The terms and words used in the above description and claims are not limited to their literal meanings, but are used by the applicant to enable a clear and consistent understanding of the present invention. Therefore, those skilled in the art should clearly understand that the above description of various embodiments of the present invention is provided for illustration purposes only and not for limiting the present invention as defined by the appended claims and their equivalents.

Claims

1. A universal caster that is easy to manufacture, characterized in that: It includes a top plate, an upper cover, an upper ball, an upper wave disc, a bracket, a lower ball, a lower wave disc, a fixing part and a wheel body; the bracket includes a bracket seat and two support arms, and the wheel body is arranged between the two support arms and is rotatably connected to the two support arms; the top plate, the upper cover, the upper wave disc, the bracket seat and the lower wave disc are arranged in sequence from top to bottom; the upper ball is arranged between the upper cover and the upper wave disc, and the upper cover and the upper wave disc clamp the upper ball; the top surface of the lower wave disc is provided with a lower annular groove, the lower ball is arranged between the bracket seat and the lower wave disc, and the lower ball is embedded in the lower annular groove, and the bracket seat and the lower wave disc clamp the lower ball; the fixing part passes through the top plate, the upper cover, the upper wave disc, the bracket seat and the lower wave disc and fixes the top plate, the upper cover and the lower wave disc together.

2. The easy-to-manufacture universal caster according to claim 1, characterized in that: The bottom surface of the upper cover is provided with an upper cover ring groove, the top surface of the upper wave plate is provided with an upper ring groove, and the upper ball is embedded in the upper cover ring groove and the upper ring groove.

3. The easy-to-manufacture universal caster according to claim 2, characterized in that: The top surface of the upper wave plate is provided with an annular protrusion, and the circumference of the upper wave plate is provided with an upwardly extending wave plate edge, the wave plate edge is located outside the annular protrusion, and the upper annular groove is formed between the wave plate edge and the annular protrusion.

4. The easy-to-manufacture universal caster according to any one of claims 1 to 3, characterized in that: The upper cover is provided with an upper cover edge extending downward on the periphery of the upper cover, and the upper cover edge is located on the outer side of the upper wave plate.

5. The easy-to-manufacture universal caster according to any one of claims 1 to 3, characterized in that: The bottom surface of the top plate is provided with a top plate annular groove, the top surface of the upper cover is provided with an upper cover protrusion matched with the top plate annular groove, and the upper cover protrusion is embedded in the top plate annular groove.

6. The easy-to-manufacture universal caster according to any one of claims 1 to 3, characterized in that: The bracket seat is provided with a penetrating bracket opening, a limiting convex ring is provided on the top surface of the bracket seat around the bracket opening, the upper wave plate is provided with a wave plate opening matched with the limiting convex ring, and the limiting convex ring is embedded in the wave plate opening.

7. The easy-to-manufacture universal caster according to any one of claims 1 to 3, characterized in that: The fixing member is a rivet, or the fixing member includes a screw and a nut sleeved on the screw.

8. The easy-to-manufacture universal caster according to any one of claims 1 to 3, characterized in that: A brake assembly is also fixed on the bracket, and the brake assembly includes a brake pedal, a brake release pedal and a brake assembly; the brake assembly includes an integrally formed middle plate, a brake plate and an elastic member, the middle plate is rotatably connected to the bracket, the brake plate is located at one end of the middle plate, and the elastic member abuts the bracket; the middle plate can be rotated to a braking state in which the brake plate abuts the wheel body and a brake release state in which the brake plate is separated from the wheel body; the brake release pedal is rotatably connected to both the bracket and the brake pedal, and a locking structure is provided on the brake release pedal; the brake pedal is rotatably connected to one end of the middle plate provided with the brake plate, and the brake pedal includes an adapter that is adapted to the locking structure; when the brake pedal is stepped on, the brake pedal can drive the middle plate to rotate from the brake release state to the braking state, and when the middle plate is in the braking state, the adapter is locked with the locking structure to keep the middle plate in the braking state; when the adapter is separated from the locking structure, the reset force applied by the elastic member to the middle plate pushes both the middle plate and the brake pedal to reset.

9. The easy-to-manufacture universal caster according to any one of claims 1 to 3, characterized in that: Dust covers are arranged on both sides of the wheel body, and the dust covers are located between the supporting arms and the wheel body.

10. The easy-to-manufacture universal caster according to claim 9, characterized in that: The outer side surface of the dust cover comprises a plane portion located at the center thereof, a boss is arranged on the plane portion, and a through hole penetrating the dust cover is arranged on the boss; the support arm abuts against the boss.

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