Universal trundle

Abstract

The invention provides a universal trundle which comprises a trundle body and a plurality of supporting rods, the trundle body comprises a circular cavity and an outlet, the outlet is located in the bottom of the circular cavity, and a plurality of balls are arranged in the circular cavity; and the trundle ball is matched with the circular cavity, part of the trundle ball is located in the circular cavity and abuts against the ball, and the other part of the trundle ball is arranged in a protruding mode relative to the outlet. The friction force between the trundle ball and the inner wall of the circular cavity is reduced through the arrangement of the balls, smooth rolling of the trundle ball is improved, then smooth movement of the trundle body is achieved, the trundle ball can rotate by 360 degrees through the arrangement of the trundle ball in the circular cavity, and then universal movement of the trundle body and the universal trundle is achieved. The universal moving device is simple in structure, universal moving can be achieved, smooth steering can also be achieved, and application and popularization are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical structures, and in particular to a universal caster. Background Art

[0002] Casters are divided into movable casters and fixed casters. Movable casters are also called universal wheels, and their structure allows 360-degree rotation; fixed casters are also called fixed casters, which have no rotating structure and cannot rotate.

[0003] Although the existing universal wheels can achieve 360° rotation and forward movement, the rotation process is relatively jerky and not smooth, which affects the user experience. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a universal caster to solve the problem of rotation jamming of the universal caster.

[0005] Based on the above purpose, the present invention provides a universal caster, comprising:

[0006] The caster body comprises a circular cavity and an outlet, wherein the outlet is located at the bottom of the circular cavity, and a plurality of balls are arranged in the circular cavity;

[0007] The caster ball is adapted to the circular cavity, a part of which is located in the circular cavity and abuts against the ball bearing, and the other part is protruded relative to the outlet.

[0008] Furthermore, the caster body includes a connected caster ball upper locking nut and a caster ball lower locking nut, the caster ball upper locking nut is provided with a first opening, the caster ball lower locking nut is provided with a relative second opening and an outlet, the first opening and the second opening are connected to form the circular cavity.

[0009] Furthermore, the outer wall of the first opening is provided with a first thread, the inner wall of the second opening is provided with a second thread matched with the first thread, and the second opening is sleeved on the outer periphery of the first opening to achieve threaded connection through the first thread and the second thread.

[0010] Furthermore, a circular protrusion is provided at the bottom of the lower lock nut of the caster ball, and the circular protrusion is arranged around the outlet and abuts against the end of the first opening.

[0011] Furthermore, an arc-shaped rolling groove is provided in the circular cavity, and the ball is located in the arc-shaped rolling groove and protrudes relative to the arc-shaped rolling groove to abut against the caster ball.

[0012] Furthermore, the universal caster also includes a connecting portion, and the connecting portion is located on the caster body.

[0013] Furthermore, the connecting portion is located at the top of the caster body, and an end thereof away from the caster body is provided with a connecting through hole.

[0014] Furthermore, the universal caster also includes a connecting bracket, the connecting bracket is provided with a first ear and a second ear relative to each other, the first ear and the second ear are provided with relative holes, the connecting part is located between the first ear and the second ear, the connecting shaft passes through the hole of the first ear, the connecting through hole and the hole of the second ear in sequence to connect the connecting part with the connecting bracket, and the positioning pin passes through the connecting part and the connecting shaft at the same time to fix the connecting shaft with the connecting part.

[0015] Furthermore, a limiting groove is provided on a side of the first ear away from the second ear, and the limiting groove is located outside the hole of the first ear. One end of the connecting shaft has a limiting head, and the limiting head is located in the limiting groove to circumferentially limit the connecting shaft.

[0016] Furthermore, the connecting bracket is also provided with a connecting slot, and the connecting slot is arranged away from the first supporting ear and the second supporting ear.

[0017] From the above description, it can be seen that the universal caster provided by the present invention is provided with a caster body having a circular cavity and an outlet, so that the caster ball is located in the circular cavity and contacts with the outside world through the outlet to achieve rolling, thereby achieving the movement of the caster body. On this basis, by arranging a round ball in the circular cavity, the caster ball and the ball are in contact, which is conducive to reducing the friction between the caster ball and the inner wall of the circular cavity, improving the smooth rolling of the caster ball, thereby achieving the smooth movement of the caster body. The arrangement of the caster ball in the circular cavity enables the caster ball to rotate in a 360° direction, thereby achieving the universal movement of the caster body and the universal caster. The present application has a simple structure, can achieve universal movement, and can also achieve smooth steering, which is conducive to promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The structure of the universal caster according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 It is a perspective structural diagram of a universal caster (without a connecting bracket) according to an embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a locking nut on a caster ball according to an embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the lower lock nut of the caster ball according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of a connecting bracket according to an embodiment of the present invention;

[0024] Figure 6 The structure of the universal caster according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 7 The figure is a schematic diagram of the structure of the universal caster connected to the pallet according to an embodiment of the present invention.

[0026] In the figure: 10, caster body; 11, circular cavity; 111, arc-shaped rolling groove; 112, ball; 12, outlet; 13, caster ball upper locking nut; 131, first opening; 14, caster ball lower locking nut; 141, second opening; 142, annular protrusion; 20, caster ball; 30, connecting part; 31, connecting through hole; 40, connecting bracket; 41, first ear; 411, limiting groove; 42, second ear; 43, connecting slot; 50, connecting shaft; 51, limiting head; 60, positioning pin; 70, tray; 71, longitudinal side beam; 72, bottom deck. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] As described in the background technology, casters are divided into movable casters and fixed casters. Movable casters are also called universal wheels, and their structure allows 360-degree rotation; fixed casters are also called fixed casters, which have no rotating structure and cannot rotate.

[0030] Although the existing universal wheels can achieve 360° rotation and forward movement, the rotation process is relatively jerky and not smooth, which affects the user experience.

[0031] Based on this, the present application proposes a universal caster to achieve smooth steering of the universal wheel.

[0032] The present application is described in detail below through one or more specific embodiments.

[0033] In some embodiments, Figure 1 and Figure 2 As shown, a universal caster comprises:

[0034] The caster body 10 comprises a circular cavity 11 and an outlet 12, wherein the outlet 12 is located at the bottom of the circular cavity 11, and a plurality of balls 112 are arranged in the circular cavity 11;

[0035] The caster ball 20 is adapted to the circular cavity 11 , with a portion thereof being located in the circular cavity 11 and abutting against the ball bearing 112 , and another portion thereof being protruding relative to the outlet 12 .

[0036] Specifically, the caster body 10 has a circular cavity 11, and the bottom of the circular cavity 11 is an opening, namely the outlet 12. The caster ball 20 is located in the circular cavity 11 of the caster body 10, and a portion thereof protrudes out of the caster body 10 through the outlet 12 to contact the ground (or other movable bearing surfaces, the same below), and the other portion is located in the circular cavity 11 and abuts against the ball 112. When the caster ball 20 rolls relative to the ball 112 under the abutment of the ball 112, the portion of the caster ball 20 in contact with the ground also rolls and is displaced with the ground. Accordingly, the caster body 10 is displaced relative to the ground, so that the caster body 10 and the universal caster move.

[0037] In addition, the outlet 12 is set smaller than the diameter of the circular cavity 11, that is, the part of the caster ball 20 protruding relative to the outlet 12 is a small part, and the caster ball 20 contacts the ground through the small part, so that the caster ball 20 can rotate relative to the ground, and then the caster body 10 can move on the ground. The part of the caster ball 20 located in the circular cavity 11 is the majority, so that the caster ball 20 can be stably set in the circular cavity 11 under the limiting effect of the outlet 12.

[0038] It should be noted that the moving direction of the caster body 10 is the same as the rotation direction of the caster ball 20 and can be adjusted at any time. It can be achieved by simply changing the direction of the rotational force acting on the caster ball 20. It has a simple structure and is flexible and smooth in steering and movement.

[0039] In this embodiment, by providing a caster body 10 with a circular cavity 11 and an outlet 12, the caster ball 20 is located in the circular cavity 11 and contacts the outside world through the outlet 12 to achieve rolling, thereby achieving the movement of the caster body 10. On this basis, by providing a ball 112 in the circular cavity 11, the caster ball 20 is in contact with the ball 112, which is conducive to reducing the friction between the caster ball 20 and the inner wall of the circular cavity 11, improving the smooth rolling of the caster ball 20, thereby achieving the smooth movement of the caster body 10. The setting of the caster ball 20 in the circular cavity 11 enables the caster ball 20 to rotate in a 360° direction, thereby achieving the universal movement of the caster body 10 and the universal caster. The present application has a simple structure, can achieve universal movement, and can also achieve silky steering, which is conducive to promotion and application.

[0040] In some embodiments, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the caster body 10 includes a caster ball upper locking nut 13 and a caster ball lower locking nut 14 connected to each other, the caster ball upper locking nut 13 is provided with a first opening 131, and the caster ball lower locking nut 14 is provided with a relative second opening 141 and an outlet 12, the first opening 131 and the second opening 141 are connected to form the circular cavity 11.

[0041] Specifically, the locking nut on the caster and the locking nut on the caster are both recessed structures, and the locking nut on the caster and the locking nut on the caster are connected through the first opening 131 and the second opening 141, and the first opening 131 and the second opening 141 are connected, and the recess of the locking nut on the caster and the recess of the locking nut on the caster form the circular cavity 11, and the outlet 12 is arranged relative to the second opening 141 so that the outlet 12 is arranged away from the connection between the locking nut on the caster and the locking nut on the caster, which is beneficial to the connection stability of the locking nut on the caster and the locking nut on the caster, and further beneficial to the stability of the caster body 10 and the universal caster.

[0042] It should be noted that the inner wall of the circular cavity 11 formed by the caster upper locking nut and the caster lower locking nut is flat, that is, the recessed structures of the caster upper locking nut and the caster lower locking nut are fully adapted, and the caster ball 20 rotates in the smooth circular cavity 11, which is conducive to the smooth turning and movement of the universal caster.

[0043] In some embodiments, the outer wall of the first opening 131 is provided with a first thread, the inner wall of the second opening 141 is provided with a second thread adapted to the first thread, and the second opening 141 is sleeved on the outer periphery of the first opening 131 to achieve threaded connection through the first thread and the second thread.

[0044] Specifically, the lower locking nut 14 of the caster ball and the upper locking nut 13 of the caster ball are threadedly connected. Specifically, the lower locking nut 14 of the caster ball is sleeved on the outer wall of the upper locking nut 13 of the caster ball, the inner wall of the lower locking nut 14 of the caster ball is provided with a second thread, and the outer wall of the upper locking nut 13 of the caster ball is provided with a first thread. The first thread and the second thread are connected so that the upper locking nut 13 of the caster ball and the lower locking nut 14 of the caster ball are connected.

[0045] The threaded connection between the caster ball upper locking nut 13 and the caster ball lower locking nut 14 realizes a detachable connection, which can facilitate the assembly of the caster body 10 and the caster ball 20. The assembly process is as follows: first, the caster ball 20 is placed in the caster ball lower locking nut 14 through the second opening 141, and a part of the caster ball 20 protrudes out of the caster ball lower locking nut 14 through the outlet 12. Thereafter, the caster ball lower locking nut 14 is threadedly connected to the caster ball upper locking nut 13, thereby completing the assembly of the caster body 10 and the caster ball 20. The assembly process is simple and the rotation is smooth.

[0046] In some embodiments, Figure 4 As shown, a circular protrusion 142 is provided at the bottom of the caster ball lower lock nut 14 . The circular protrusion 142 is arranged around the outlet 12 and abuts against the end of the first opening 131 .

[0047] Specifically, in order to make the inner wall of the caster body 10 smooth, after the caster ball lower lock nut 14 is threadedly connected to the caster ball upper lock nut 13, the end of the first opening 131 of the caster ball upper lock nut 13 must be abutted against the end of the inner wall of the caster ball lower lock nut 14. Since the second thread is provided on the inner wall of the second opening 141, the annular protrusion 142 is provided at the position of the second thread away from the second opening 141, so that the annular protrusion 142 is abutted against the end of the first opening 131, and the inner wall of the annular protrusion 142 is smoothly connected to the inner wall of the caster ball upper lock nut 13 to form the circular cavity 11, so that the caster ball 20 can smoothly rotate in the circular cavity 11 formed by the caster ball upper lock nut 13 and the caster ball lower lock nut 14.

[0048] In some embodiments, an arc-shaped rolling groove 111 is provided in the circular cavity 11 , and the ball 112 is located in the arc-shaped rolling groove 111 and protrudes relative to the arc-shaped rolling groove 111 to abut against the caster ball 20 .

[0049] Specifically, the arc-shaped rolling groove 111 is used to accommodate a plurality of balls 112, and the balls 112 are used to abut against the caster ball 20, thereby facilitating the smooth rotation of the caster ball 20. The arc-shaped rolling groove 111 is provided in the circular cavity 11 to limit the balls 112, thereby ensuring the stability of the internal structure of the universal caster and the ease of assembly.

[0050] In addition, an arc-shaped rolling groove 111 adapted to the circular cavity 11 is provided on the inner wall of the circular cavity 11 to accommodate the plurality of balls 112, so that the abutment position of the plurality of balls 112 and the caster ball 20 is stable, thereby achieving smooth and stable rotation of the caster ball 20, which is beneficial to the operation stability of the universal caster.

[0051] It should be noted that the arc-shaped rolling groove 111 can be set at the top of the caster ball 20 or at the top and side of the caster ball 20, so that the ball 112 can play a stabilizing role on the caster ball 20, which is beneficial to increase the smoothness of the rotation of the caster ball.

[0052] It should be noted that the specific setting of the circular arc rolling groove 111 is related to the performance parameters of the universal caster. The universal caster with a larger number of circular arc rolling grooves 111 has a smoother moving performance than the universal caster with a smaller number of circular arc rolling grooves 111. However, the more circular arc rolling grooves 111, the better. The more circular arc rolling grooves 111 there are, the larger the occupied area in the circular cavity 11, which increases the cost. The balls 112 in the multiple circular arc rolling grooves 111 are likely to increase the failure rate, and the cost performance is not high. The best number of circular arc rolling grooves 111 is three or four.

[0053] In addition, when the arc-shaped rolling groove 111 is only provided on the inner wall of the locking nut 13 on the caster ball, the annular protrusion 142 abuts against the end of the first opening 131 of the locking nut 13 on the caster ball, so that the opening of the arc-shaped rolling groove 111 on the inner wall of the locking nut 13 on the caster ball is blocked, thereby limiting the position of the ball 112 in the arc-shaped rolling groove 111, so that the ball 112 is stably provided in the arc-shaped rolling groove 111, so that the caster ball 20 can be smoothly moved in the circular cavity 11 under the action of the ball 112. Sliding rotation; when the arc-shaped rolling groove 111 is provided on both the caster ball upper lock nut 13 and the caster ball lower lock nut 14, the arc-shaped rolling groove 111 provided on the caster ball upper lock nut 13 on the annular boss corresponds to and is connected to the arc-shaped rolling groove 111, and the arc-shaped rolling groove 111 on the annular boss is not connected, so as to limit the ball 112 in the arc-shaped rolling groove 111, so as to ensure the stable movement of the ball 112 in the arc-shaped rolling groove 111, which is beneficial to the movement stability and smoothness of the universal caster.

[0054] In some embodiments, Figure 2 As shown, the universal caster further includes a connecting portion 30 , and the connecting portion 30 is located on the caster body 10 .

[0055] Specifically, the connecting portion 30 is used to connect with other structures so that the universal caster is connected to other structures, so that the structure has a universal movement function under the action of the universal caster. The connecting portion 30 is located on the caster body 10, and the caster ball 20 is located in the circular cavity 11 inside the caster body 10, and contacts the ground (or other bearing surface, the same below) through the outlet 12, so that the caster ball 20 can rotate relative to the ground, thereby driving the caster body 10 and the connecting portion 30 to move relative to the ground. The connecting portion 30 is connected to other structures, thereby driving other structures to move on the ground. The connecting portion 30 can facilitate the connection between the universal caster and other structures, which is conducive to improving the practicality and popularization and application of the universal caster.

[0056] In some embodiments, Figure 2 As shown, the connecting portion 30 is located at the top of the caster body 10 , and a connecting through hole 31 is provided at one end thereof away from the caster body 10 .

[0057] Specifically, the outlet 12 of the caster body 10 is located at the bottom of the caster body 10, and the caster ball 20 extends out of the circular cavity 11 through the outlet 12 to contact the ground. The connecting part 30 is arranged at the top of the caster body 10, so that the force of the structure connected by the connecting part 30 can act vertically on the connecting part 30, and then act on the caster body 10 and the caster ball 20, so as to avoid the connecting part 30 being subjected to stress perpendicular to its axial direction, which may easily cause damage to the connecting part 30. Arranging the connecting part 30 at the top of the caster body 10 can increase the strength of the connecting part 30, and thus increase the load-bearing capacity of the universal caster.

[0058] In addition, the connecting portion 30 is provided with the connecting through hole 31 at one end away from the caster body 10 to facilitate the connection of the connecting portion 30 with other structures, which is beneficial to the practicality of the universal caster.

[0059] In some embodiments, Figure 1 , Figure 5 and Figure 6 As shown, the universal caster also includes a connecting bracket 40, on which a first ear 41 and a second ear 42 are provided relative to each other, and the first ear 41 and the second ear 42 are provided with relative holes, and the connecting portion 30 is located between the first ear 41 and the second ear 42, and the connecting shaft 50 passes through the hole of the first ear 41, the connecting through hole 31 and the hole of the second ear 42 in sequence to connect the connecting portion 30 with the connecting bracket 40, and the positioning pin 60 passes through the connecting portion 30 and the connecting shaft 50 at the same time to fix the connecting shaft 50 with the connecting portion 30.

[0060] Specifically, the connecting portion 30 is connected to the connecting bracket 40 through the first ear 41 and the second ear 42, so that the connecting bracket 40 is connected to other structures, and the connecting portion 30 is connected to the first ear 41 and the second ear 42 through the connecting shaft 50. On this basis, the connecting portion 30 and the connecting shaft 50 are fixedly connected through the positioning pin 60, that is, the positioning pin 60 fixes the relative position of the connecting shaft 50 and the connecting portion 30 to prevent the caster body 10 from rotating relative to the connecting shaft 50, which is beneficial to the operation stability and practicality of the universal caster.

[0061] In addition, in order to ensure the fixing effect of the positioning pin 60, the positioning pin 60 passes through one side wall of the connecting hole 31 and then passes through the connecting shaft 50, and then passes through the other side wall of the connecting hole 31, thereby realizing the fixed connection between the connecting shaft 50 and the connecting part 30 where the connecting hole 31 is located, thereby ensuring the fixing effect of the positioning pin 60 on the connecting shaft 50 and the connecting part 30.

[0062] It should be noted that the connecting shaft 50 is used to connect the connecting part 30 with the first ear 41 and the second ear 42 of the connecting bracket 40. After the connecting shaft 50 passes through the first ear 41, the connecting through hole 31 of the connecting part 30 and the second ear 42, it is fixedly connected to the connecting bracket 40 to prevent the connecting shaft 50 from rotating, thereby causing the caster body 10 to rotate, which is not conducive to the stability of the universal caster.

[0063] In some embodiments, Figure 1 and Figure 5 As shown, a limiting groove 411 is provided on one side of the first support ear 41 away from the second support ear 42, and the limiting groove 411 is located outside the hole of the first support ear 41. One end of the connecting shaft 50 has a limiting head 51, and the limiting head 51 is located in the limiting groove 411 to limit the connecting shaft 50 circumferentially.

[0064] Specifically, the connecting shaft 50 and the connecting bracket 40 are fixedly connected via the limiting groove 411 on the first support ear 41. One end of the connecting shaft 50 having a limiting head 51 is located in the limiting groove 411. The limiting groove 411 circumferentially limits the connecting shaft 50, thereby preventing the connecting shaft 50 from rotating relative to the first support ear 41, so that the relative positions of the connecting shaft 50, the first support ear 41 and the connecting bracket 40 are fixed, thereby achieving a fixed connection between the connecting shaft 50 and the connecting bracket 40, so that the universal caster is stably arranged.

[0065] In addition, the limit head 51 of the connecting shaft 50 can also axially limit the connecting shaft 50 to prevent the connecting shaft 50 from leaving the hole of the first support ear 41 or the second support ear 42 or the connecting through hole 31, thereby facilitating the stable connection between the connecting part 30 and the connecting bracket 40.

[0066] It should be noted that a limiting hole is provided at one end of the connecting shaft 50 away from the limiting head 51, and the limiting hole is located on the side of the second support ear 42 away from the first support ear 41. A limiting rod passes through the limiting hole to achieve axial limitation of the connecting shaft 50, and works together with the limiting head 51 to axially limit the connecting shaft 50, thereby ensuring the connection stability between the connecting shaft 50 and the connecting bracket 40.

[0067] Exemplarily, the limit head 51 is a straight-line structure, the limit groove 411 is a straight-line groove, and the limit head 51 is located in the limit groove 411, which can realize both circumferential positioning of the connecting shaft 50 and axial positioning of the connecting shaft 50.

[0068] For another example, the limiting head 51 is a straight-line structure, the limiting groove 411 is a cross-shaped groove, and the limiting head 51 can be at two positions of the limiting groove 411, such as Figure 1 and Figure 6 As shown, the limiting groove 411 limits the limiting head 51, that is, the connecting shaft 50 can drive the caster body 10 and the caster to rotate to change its position relative to the connecting bracket 40, so that the caster body 10 can be switched between the folded state and the use state.

[0069] In some embodiments, Figure 5 As shown, the connecting bracket 40 is further provided with a connecting slot 43 , and the connecting slot 43 is arranged away from the first support ear 41 and the second support ear 42 .

[0070] Specifically, the connecting slot 43 is used to connect with other structures so that the other structures have a universal movement function. The setting of the connecting slot 43 improves the convenience of connecting the universal caster with other structures, that is, only need to be connected, which is conducive to improving the installation efficiency of the universal caster.

[0071] For example, Figure 7 As shown, the universal caster is installed on a pallet 70 having multiple longitudinal side beams 71 and multiple bottom boards 72 stacked up and down, the side walls of the connecting slot 43 are arranged horizontally, the lateral distance of the connecting slot 43 is adapted to the distance between two adjacent bottom boards 72, that is, it is located between two adjacent bottom boards 72, and the vertical distance of the connecting slot 43 is adapted to the width of the longitudinal side beam 71, so that the two side walls of the connecting slot 43 are respectively located on both sides of the longitudinal side beam 71, and are engaged with the longitudinal side beam 71, thereby realizing the lateral and vertical limitation of the universal caster, so that the universal caster is stably connected to the pallet 70 in the horizontal direction.

[0072] It should be noted that the vertical force between the universal caster and the pallet is related to the friction and clamping force between the connecting slot and the longitudinal side beam and the side wall of the bottom deck, and the connecting slot can also be stably arranged relative to the pallet in the vertical direction.

[0073] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0074] The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A universal caster, characterized in that: include: The caster body comprises a circular cavity and an outlet, wherein the outlet is located at the bottom of the circular cavity, and a plurality of balls are arranged in the circular cavity; The caster ball is adapted to the circular cavity, a part of which is located in the circular cavity and abuts against the ball bearing, and the other part is protruded relative to the outlet.

2. The universal caster according to claim 1, characterized in that: The caster body comprises an upper locking nut and a lower locking nut of a caster ball connected to each other, the upper locking nut of the caster ball is provided with a first opening, the lower locking nut of the caster ball is provided with a second opening and an outlet opposite thereto, the first opening and the second opening are connected to form the circular cavity.

3. The universal caster according to claim 2, characterized in that: The outer side wall of the first opening is provided with a first thread, the inner side wall of the second opening is provided with a second thread matched with the first thread, and the second opening is sleeved on the outer periphery of the first opening to achieve threaded connection through the first thread and the second thread.

4. The universal caster according to claim 3, characterized in that: A circular protrusion is provided at the bottom of the lower lock nut of the caster ball. The circular protrusion is arranged around the outlet and abuts against the end of the first opening.

5. The universal caster according to claim 1, characterized in that: An arc-shaped rolling groove is arranged in the circular cavity, and the ball is located in the arc-shaped rolling groove and protrudes relative to the arc-shaped rolling groove to abut against the caster ball.

6. The universal caster according to claim 1, characterized in that: It also includes a connecting portion, which is located on the caster body.

7. The universal caster according to claim 6, characterized in that: The connecting portion is located at the top of the caster body, and an end thereof away from the caster body is provided with a connecting through hole.

8. The universal caster according to claim 7, characterized in that: It also includes a connecting bracket, which is provided with a first ear and a second ear relative to each other, and the first ear and the second ear are provided with relative holes, the connecting part is located between the first ear and the second ear, and the connecting shaft passes through the hole of the first ear, the connecting through hole and the hole of the second ear in sequence to connect the connecting part with the connecting bracket, and the positioning pin passes through the connecting part and the connecting shaft at the same time to fix the connecting shaft with the connecting part.

9. The universal caster according to claim 8, characterized in that: A limiting groove is provided on a side of the first support ear away from the second support ear, and the limiting groove is located outside the hole of the first support ear. One end of the connecting shaft has a limiting head, and the limiting head is located in the limiting groove to limit the connecting shaft circumferentially.

10. The universal caster according to claim 9, characterized in that: The connecting bracket is also provided with a connecting slot, and the connecting slot is arranged away from the first supporting ear and the second supporting ear.

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