Universal trundle with braking function

Abstract

The utility model discloses a universal trundle with a braking function, and belongs to the technical field of trundles. Comprising a fixing seat, a wheel carrier, a wheel body and a wheel carrier and wheel body brake mechanism, the fixing seat is fixed with a static component in a using state, the wheel carrier is located on the lower portion of the fixing seat, the upper portion of the wheel carrier is in running fit with the fixing seat through a bearing, and the wheel body is rotatably arranged on the lower portion of the wheel carrier through a wheel body pin shaft. The wheel carrier and wheel body braking mechanism is characterized in that the wheel carrier and wheel body braking mechanism is arranged on the fixing base, extends to the position below the bearing and is connected with the wheel carrier at the position corresponding to the position between the wheel carrier and the upper portion of the wheel body, and the wheel carrier and the wheel body are braked or released through the wheel carrier and wheel body braking mechanism at the same time. The device has the advantages that when the wheel body and the wheel carrier rotate to any position, interference influence on operation of the wheel carrier and wheel body brake mechanism is avoided, and operation convenience and use safety are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of caster technology, specifically relating to a universal caster with a braking function. Background Technology

[0002] As is well known, the aforementioned swivel casters with braking functions have a wide range of applications, such as medical beds, operating tables, medical trolleys, work carts, logistics industry goods handling carts, storage cages, milk carts, logistics trolleys and shelves, shopping carts, display racks, office furniture, filing cabinets, large household appliances such as washing machines and refrigerators, and various portable exercise equipment such as treadmills, and so on. The aforementioned braking function can prevent abnormal accidental displacement, ensure safety, provide precise positioning control, and facilitate the maintenance and repair of the main body, etc.

[0003] While existing swivel casters with braking functions can basically meet the requirements for stopping swivel casters (also known as "wheel bodies"), they have the following shortcomings: since the braking mechanism is set on the wheel frame, and the wheel body is rotatably set on the wheel frame through the wheel axle, when the wheel body changes angle or even changes direction, the wheel frame also changes angle or even changes direction accordingly. In other words, the wheel and the wheel frame move in a closely related angular relationship. Therefore, when the brake plate of the braking mechanism (also known as the "stopping mechanism") rotates with the wheel to an awkward angle or position that is difficult or even impossible for the user or operator to reach with their foot, if braking is absolutely necessary, the only options are: First, manually operate the brake by bending over. This hand-based operation is cumbersome because it eliminates the foot brake function, and careless operation can injure the operator's limbs, such as fingers, and is unhygienic. Second, repeatedly pull the wheel forward and backward to align it with the user, allowing them to stop it by foot. However, this method is relatively cumbersome, and in many cases, space constraints prevent this, leading to a sense of complacency and a failure to stop the wheel. This often carries safety risks, such as slippage due to accidental contact, or serious consequences if the ground is sloping and the operator releases their hand from the handle. The shortcomings of the aforementioned swivel casters can also be seen in the "swivel casters with brakes" recommended by CN212637031U.

[0004] Given the existing technical situation, it is necessary to make reasonable improvements. The technical solution to be introduced below is generated in this context. Utility Model Content

[0005] The objective of this invention is to provide a universal caster with a braking function that helps to prevent the braking mechanism from changing angles as the wheel frame sets the wheel body, and ensures that it is always in a position that can be stopped by the user at any time, thus guaranteeing the convenience of operation and the safety of use.

[0006] The present invention accomplishes its objective as follows: a universal caster with braking function includes a fixed base, a wheel frame, a wheel body, and a wheel frame and wheel body braking mechanism. The fixed base is fixed to a static component in use. The wheel frame is located at the lower part of the fixed base, and the upper part of the wheel frame is rotatably engaged with the fixed base via a bearing. The wheel body is rotatably mounted at the lower part of the wheel frame via a wheel body pin. The wheel frame and wheel body braking mechanism is located on the fixed base and extends below the bearing, connecting to the wheel frame at a position corresponding to the upper part between the wheel frame and the wheel body. The wheel frame and wheel body braking mechanism simultaneously brakes or releases the brakes on both the wheel frame and the wheel body.

[0007] In a specific embodiment of this utility model, a wheel frame gear is fixed on the upper part of the wheel frame and on the side facing downwards corresponding to the fixed seat. Locking teeth are formed on the upper surface of the wheel frame gear and around its circumference. A left pivot support arm extends longitudinally downwards on the left side of the wheel frame, and a right pivot support arm extends longitudinally downwards on the right side of the wheel frame. The space between the left and right pivot support arms, which correspond to each other, forms a wheel insertion cavity. The wheel is pivotally supported between the left and right pivot support arms when in the wheel insertion cavity. Simultaneously, the wheel is braked or released within the wheel insertion cavity by the wheel frame wheel braking mechanism mounted on the fixed seat while the locking teeth of the wheel frame gear are engaged or disengaged. A locking tooth plate clearance opening is provided on the fixed seat above the locking teeth of the wheel frame gear.

[0008] In another specific embodiment of this utility model, a left pivot support arm pin hole is provided at the lower end of the left pivot support arm of the wheel body, and a right pivot support arm pin hole is provided at the lower end of the right pivot support arm of the wheel body. The wheel body has a wheel body bearing, and the wheel body is rotatably mounted on the rotating outer ring of the wheel body bearing. The center hole of the wheel body bearing corresponds to the pin holes of the left and right pivot support arms of the wheel body. The wheel body pin passes through the pin hole of the left pivot support arm of the wheel body, the center hole of the wheel body bearing, and the pin hole of the right pivot support arm of the wheel body sequentially from left to right. A limiting nut is screwed onto the right end of the wheel body pin to limit the wheel body pin together with the non-rotating inner ring of the wheel body bearing.

[0009] In another specific embodiment of the present utility model, the fixing seat is in the shape of a rectangular flat plate or a square tubular shape with a rectangular cross-section.

[0010] In another specific embodiment of this utility model, the wheel frame and wheel body braking mechanism includes a lock plate seat, a swing arm, a lock tooth plate fixing seat, a lock tooth plate, a locking / unlocking operation plate, a guide post sleeve, a wheel body locking pressure plate, and a wheel body locking pressure plate return spring plate. The lock plate seat is fixed to the side of the fixing seat facing away from the wheel frame tooth plate. The lock plate seat has a pair of parallel upper flanges, and the space between the pair of upper flanges forms a lock plate seat cavity. The swing arm consists of a pair of parallel swing arms connected to each other by a swing arm connecting plate. A first hinge hole is provided at the end of the swing arm facing the locking / unlocking operation plate, and a second hinge hole is provided at the end of the swing arm facing the lock plate seat. A first hinge hole is fitted on the first hinge hole of the swing arm. A first hinge pin for the swing arm is provided, and a second hinge pin for the swing arm is fitted in a second hinge hole for the swing arm. The first hinge pin is hinged to the lower front end of the locking / unlocking operation plate at a position corresponding to the first hinge hole of the locking / unlocking operation plate located below the front end of the locking / unlocking operation plate. The second hinge pin is hinged to the rear end of the locking plate base at a position corresponding to the hinge hole of the flange on the rear end of the locking plate base. The rear end of the locking / unlocking operation plate is configured as a free end for user foot operation. The rear end of the locking tooth plate fixing seat is connected to the second hinge hole of the locking / unlocking operation plate located above the front end of the locking / unlocking operation plate via a hinge pin of the locking tooth plate fixing seat at a position corresponding to the second hinge hole of the locking / unlocking operation plate located above the front end of the locking / unlocking operation plate. The front end of the locking / unlocking control panel is hinged to the upper part. The lower rear end of the locking tooth plate fixing seat is hinged to the upper flange of the locking plate seat via the locking tooth plate fixing seat hinge shaft. The locking tooth plate corresponds to the locking tooth plate clearance opening. The upper end of the locking tooth plate is fixed to the front end of the locking tooth plate fixing seat and is perpendicular to the locking tooth plate fixing seat. The lower end of the locking tooth plate has locking teeth for locking or unlocking with the locking teeth of the wheel frame gear. The guide post sleeve is fixed to the center position of the bearing. A guide post hole is formed in the center position of the guide post sleeve, extending from the upper end of the guide post sleeve to the lower end. A guide post is vertically displaced in the guide post hole. A guide post top extends from the center position of the upper end face of the guide post, and a guide post top extends from the center position of the lower end face. A guide post has a lower top head, and the upper top head of the guide post contacts or de-contacts the downward-facing side of the locking tooth plate fixing seat. The lower top head of the guide post contacts or de-contacts the upward-facing side of the rear end of the wheel locking pressure plate. A wheel locking pressure plate hinge lug is fixed on the left and right sides of the middle part of the wheel locking pressure plate at corresponding positions. The hinge lugs are locked to the wheel frame by the hinge lug pins. The wheel locking pressure plate return spring is located between the wheel frame and the wheel locking pressure plate. One end of the wheel locking pressure plate return spring is supported on the wheel frame, and the other end is fixed with a spring plate positioning pin. The spring plate positioning pin extends to the bottom of the wheel locking pressure plate at the position corresponding to the spring plate positioning pin hole opened on the wheel locking pressure plate.

[0011] In another specific embodiment of this utility model, a spring plate support limiting notch is formed on the wheel frame at a position corresponding to one end of the wheel locking pressure plate reset spring plate, and one end of the wheel locking pressure plate reset spring plate is supported within the spring plate support limiting notch.

[0012] In a further specific embodiment of this utility model, the cross-sectional shape of the guide post hole is rectangular, and the cross-sectional shape of the guide post is also rectangular.

[0013] In a further specific embodiment of this utility model, the cross-sectional shape of the guide post hole is circular, and the cross-sectional shape of the guide post is also circular.

[0014] In yet another specific embodiment of this utility model, one or a pair of wheel contact flanges are provided on the downward-facing side of the front end of the wheel locking pressure plate.

[0015] In yet another specific embodiment of this utility model, the wheel contact flange is shaped like a spherical crown, and when there is a pair of wheel contact flanges, the pair of wheel contact flanges are arranged in a left-right interval or a front-back interval.

[0016] The technical effect of the solution provided by this utility model is that, by overcoming the conventional design bias in the prior art, the wheel frame and wheel body braking mechanism is set on a fixed seat as a static component. Therefore, the wheel body and wheel frame will not interfere with the operation of the wheel frame and wheel body braking mechanism when they rotate to any position, thus ensuring the convenience of operation and the safety of use. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Enlarged view of part A;

[0019] Figure 3 for Figure 1 The detailed structural diagram of the swing arm is shown;

[0020] Figure 4 for Figure 1 A schematic diagram showing the bottom of the wheel locking pressure plate;

[0021] Figure 5 This is a schematic diagram of the present invention in the state of braking the wheel body. Detailed Implementation

[0022] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0023] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on Figure 1 The current position is used as an example and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0024] Example 1: Please refer to Figure 1 The diagram shows a fixed base 1, a wheel frame 2, a wheel body 3, and a wheel frame and wheel body braking mechanism 4. The fixed base 1 is fixed to a static component in use. The wheel frame 2 is located at the lower part of the fixed base 1, and the upper part of the wheel frame 2 is rotatably connected to the fixed base 1 via a bearing 5, such as a pressure bearing. The wheel body 3 is rotatably mounted at the lower part of the wheel frame 2 via a wheel body pin 31. The wheel frame and wheel body braking mechanism 4 is mounted on the fixed base 1 and extends below the bearing 5, connecting to the wheel frame 2 at a position corresponding to the upper part of the wheel frame 2 and the wheel body 3. The wheel frame and wheel body braking mechanism 4 simultaneously brakes or releases the brakes on both the wheel frame 2 and the wheel body 3.

[0025] The applicant needs to clarify that the static components mentioned above refer to components that are fixed to the object of use during use. The object of use mentioned here includes, as mentioned in the background technology section above, the legs of medical beds, operating tables, medical trolleys, work carts, logistics industry goods turnover carts, storage cages, milk carts, logistics trolleys, shelves, shopping carts, display racks, office furniture, filing cabinets, washing machines, refrigerators, sports equipment such as treadmills, etc.

[0026] Please stay tuned. Figure 1A wheel frame gear 21 is fixed to the upper part of the aforementioned wheel frame 2 and on the side facing downwards corresponding to the aforementioned fixing seat 1. Locking teeth 211 are formed on the upper surface of the wheel frame gear 21 and around its circumference. A left pivot support arm 22 extends longitudinally downwards on the left side of the wheel frame 2, and a right pivot support arm 23 extends longitudinally downwards on the right side of the wheel frame 2. The space between the left pivot support arm 22 and the right pivot support arm 23, which are symmetrically positioned and facing each other, is configured as follows: The wheel body enters the cavity 24, and the aforementioned wheel body 3 is pivotally supported between the left pivot support arm 22 and the right pivot support arm 23 of the wheel body in the state corresponding to the wheel body entering the cavity 24; while the aforementioned wheel frame wheel body braking mechanism 4 provided on the aforementioned fixed seat 1 engages and brakes or disengages the aforementioned wheel frame tooth disc locking tooth 211, the aforementioned wheel body 3 is simultaneously braked or released in the aforementioned wheel body entering the cavity 24; a locking tooth plate clearance opening 11 is provided on the aforementioned fixed seat 1 and at a position corresponding to the aforementioned wheel frame tooth disc locking tooth 211.

[0027] A left pivot support arm pin hole 221 is provided at the lower end of the aforementioned left pivot support arm 22, and a right pivot support arm pin hole 231 is provided at the lower end of the aforementioned right pivot support arm 23. The aforementioned wheel 3 has a wheel bearing 32, and the wheel 3 is rotatably mounted on the rotating outer ring of the wheel bearing 32. The wheel bearing center hole 321 of the wheel bearing 32 corresponds to the aforementioned left pivot support arm pin hole 221 and right pivot support arm pin hole 231. The aforementioned wheel pin 31 passes through the left pivot support arm pin hole 221, the wheel bearing center hole 321, and the right pivot support arm pin hole 231 sequentially from left to right, and is screwed onto the right end of the wheel pin 31 by a wheel pin end limiting nut 311, thereby limiting the wheel pin 31 together with the non-rotating inner ring of the wheel bearing 32. From the foregoing description and in conjunction with Figure 1 As can be seen from the diagram, the wheel frame and wheel body braking mechanism 4 brakes both the wheel frame 2 and the wheel body 3 simultaneously.

[0028] In this embodiment, the cross-sectional shape of the aforementioned fixing seat 1 is a square tube with a U-shape, and a fixing seat screw hole 12 for fixing the fixing seat 1 to the aforementioned static component is also shown. However, a rectangular plate can also be used as the fixing seat 1.

[0029] Please stay tuned. Figure 1 And see Figures 2 to 3The aforementioned wheel frame and wheel body braking mechanism 4 includes a locking plate seat 41, a swing arm 42, a locking tooth plate fixing seat 43, a locking tooth plate 44, a locking / unlocking operation plate 45, a guide post sleeve 46, a wheel body locking pressure plate 47, and a wheel body locking pressure plate return spring plate 48. The locking plate seat 41 is preferably fixed by welding to the side of the aforementioned fixing seat 1 facing away from the aforementioned wheel frame tooth plate 21, that is, fixed to the side of the bottom wall of the fixing seat 1 facing upward. The locking plate seat 41 has a pair of parallel locking plate seat upper flanges, and the space between the pair of locking plate seat upper flanges forms a locking plate seat cavity 411. The swing arm 42 is a pair of parallel swing arms connected to each other by a swing arm connecting plate 421. A first swing arm hinge is provided at the end of the swing arm 42 facing the locking / unlocking operation plate 45. A first hinge pin 4221 is provided on the first hinge hole 422, and a second hinge pin 423 is provided on the end of the swing arm 42 facing the lock plate seat 41. A second hinge pin 4231 is provided on the second hinge hole 423. The first hinge pin 4221 is hinged to the lower front end of the lock / unlock operation plate 45 at the position of the first hinge hole 451 on the front end of the lock / unlock operation plate 45. The second hinge pin 4231 is hinged to the rear end of the lock plate seat 41 at the position of the hinge hole on the folded edge of the aforementioned lock plate seat 41. The rear end of the aforementioned lock / unlock operation plate 45 is configured to provide... The user's foot operates the free end. The rear end of the locking plate fixing seat 43 is hinged to the front end of the locking and unlocking operation plate 45 via the locking plate fixing seat hinge pin 431 at a position corresponding to the second hinge hole 452 of the locking and unlocking operation plate opened above the front end of the locking and unlocking operation plate 45. The lower rear end of the locking plate fixing seat 43 is hinged to the upper flange of the locking plate seat of the aforementioned locking plate seat 41 via the locking plate fixing seat hinge pin 432. The locking plate 44 corresponds to the aforementioned locking plate clearance opening 11. The upper end of the locking plate 44 is fixed to the front end of the locking plate fixing seat 43 and is perpendicular to the locking plate fixing seat 43. The lower end of the locking plate 44 has locking plate teeth 441 for locking or unlocking with the locking teeth 211 of the wheel frame gear plate. The guide post sleeve 4 6 is fixed at the center position of the aforementioned bearing 5. A guide post hole 461 is formed at the center position of the guide post sleeve 46, extending from the upper end of the guide post sleeve 46 to the lower end. A guide post 462 is vertically displaced within the guide post hole 461. An upper guide post head 4621 extends from the center position of the upper end face of the guide post 462, and a lower guide post head 4622 extends from the center position of the lower end face. The upper guide post head 4621 contacts or de-contacts with the downward-facing side of the aforementioned locking tooth plate fixing seat 43. The lower guide post head 4622 contacts or de-contacts with the upward-facing side of the rear end of the aforementioned wheel locking pressure plate 47. A wheel locking pressure plate hinge lug 471 is fixed at the corresponding position on the left and right sides of the middle part of the wheel locking pressure plate 47.The hinge pin 4711 locks the wheel locking plate hinge ear 471 to the aforementioned wheel frame 2 at a position corresponding to the hinge pin hole 4712 on the wheel locking plate hinge ear 471. The wheel locking plate return spring plate 48 is located between the wheel frame 2 and the wheel locking plate 47, with one end supported on the wheel frame 2 and the other end fixed to a spring plate positioning pin 481. This spring plate positioning pin 481 extends below the wheel locking plate 47 at a position corresponding to the spring plate positioning pin hole 472 on the wheel locking plate 47.

[0030] Depend on Figure 1 As shown, a spring plate support limiting notch 212 is formed on the aforementioned wheel frame 2 at a position corresponding to one end of the aforementioned wheel locking pressure plate reset spring plate 48, and one end of the aforementioned wheel locking pressure plate reset spring plate 48 is supported in the spring plate support limiting notch 212.

[0031] Depend on Figure 1 and Figure 2 As shown, the cross-sectional shape of the aforementioned guide post hole 461 is rectangular, and the cross-sectional shape of the aforementioned guide post 462 is also rectangular.

[0032] Please see Figure 4 A wheel contact flange 473 is provided on the downward-facing side of the front end of the aforementioned wheel locking plate 47.

[0033] In this embodiment, the aforementioned wheel contact flange 473 is shaped like a spherical crown. Furthermore, as another implementation, a pair of wheel contact flanges 473 may be used, in which case the pair of wheel contact flanges 473 are arranged with left-right or front-back spacing.

[0034] Please see Figure 5 The applicant combined Figures 1 to 5 The use of this utility model is described using a medical trolley as an example. Since the fixed seat 1 is fixed to the lower part of the rear support leg of the medical trolley, which is a static component, the wheel frame and wheel body braking mechanism 4 is in a non-stopping, non-braking state for the wheel frame 2 and the wheel body 3 during the operator's pushing process. In this state, the rear end of the aforementioned locking and unlocking operation plate 45 is tilted upwards, and the locking teeth 441 of the locking tooth plate 44 are separated from the locking teeth 211 of the wheel frame tooth plate. At the same time, due to the action of the wheel body locking pressure plate return spring plate 48, the wheel body locking pressure plate 47 is in a state of moving upwards away from the wheel body 3. In other words, Figure 4 The wheel contact flange 473 shown is in a state of being away from the wheel body 3.

[0035] When the operator pushes the medical trolley to its destination and needs to stop reliably, the operator presses down on the rear end of the locking / unlocking control plate 45 with their foot. The locking / unlocking control plate 45 drives the swing arm 42. When the front end of the swing arm 42 moves downward (i.e., swings downward) and passes the inflection point (lowering from the highest position), the swing arm 42 pushes the locking tooth plate fixing seat 43, causing the front end of the locking tooth plate fixing seat 43 and the locking tooth plate 44 to move downward. That is, the locking tooth plate 44 moves downward at the position of the locking tooth plate clearance opening 11, and the locking tooth plate teeth 441 engage with the locking teeth 211 of the wheel frame gear, preventing the wheel frame 2 from rotating. Simultaneously, the downward movement of the locking tooth plate fixing seat 43 pushes the upper guide post 4621, causing the guide post 462 to move downward. The lower guide post 4622 pushes the wheel locking pressure plate 47, overcoming the reaction force of the wheel locking pressure plate return spring 48, causing the wheel locking pressure plate 47 to brake the wheel 3. Specifically, this causes... Figure 4 The wheel contact flange 473, as shown, contacts the wheel 3 and applies a reasonable force to keep the wheel 3 stationary. When the lock is released, i.e., the brake is disengaged, the operator simply needs to lift the rear end of the lock unlocking operation plate 45 slightly with their foot, and the wheel frame wheel brake mechanism 4 will release the double lock on the wheel frame 2 and the wheel 3 in the reverse process described above. During the unlocking process, the wheel locking pressure plate return spring plate 48 changes from its previous energy-storing state to an energy-releasing state, thereby instantly returning the wheel locking pressure plate 47 to a non-contact, separated reset state from the wheel 3.

[0036] Example 2: The cross-sectional shape of the aforementioned guide post hole 461 is circular, and the cross-sectional shape of the aforementioned guide post 462 is also circular, and the rest are the same as described in Example 1.

[0037] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A universal caster with a braking function, comprising a fixed base (1), a wheel frame (2), a wheel body (3), and a wheel frame and wheel body braking mechanism (4), wherein the fixed base (1) is fixed to a static component in use, the wheel frame (2) is located at the lower part of the fixed base (1), and the upper part of the wheel frame (2) is rotatably engaged with the fixed base (1) via a bearing (5), and the wheel body (3) is rotatably mounted at the lower part of the wheel frame (2) via a wheel body pin (31), characterized in that: The wheel body brake mechanism (4) is arranged on the fixed seat (1) and extends below the bearing (5) to connect with the wheel frame (2) at a position corresponding to the upper part of the wheel frame (2) and the wheel body (3), so as to brake or release the brake of the wheel frame (2) and the wheel body (3) simultaneously; a wheel frame gear plate (21) is fixed to the upper part of the wheel frame (2) and the side of the fixed seat (1) facing downward, a wheel frame gear plate locking tooth (211) is arranged on the upper surface of the wheel frame gear plate (21) and around the circumferential direction of the wheel frame gear plate (21), and a locking tooth plate accommodation opening (11) is arranged on the fixed seat (1) and above the position corresponding to the wheel frame gear plate locking tooth (211); the wheel body brake mechanism (4) comprises a locking plate seat (41), a swing arm (42), a locking tooth plate fixing seat (43), a locking tooth plate (44), a locking and unlocking operation plate (45), a guide column sleeve (46), a wheel body locking pressing plate (47) and a wheel body locking pressing plate reset spring sheet (48), the locking plate seat (41) is fixed to the side of the fixed seat (1) opposite to the wheel frame gear plate (21), the locking plate seat (41) has a pair of locking plate seat upper folding edges parallel to each other on the left and right sides, the space between the pair of locking plate seat upper folding edges is arranged as a locking plate seat cavity (411), the swing arm (42) is a pair of arms parallel to each other and connected by a swing arm connecting plate (421), a swing arm first hinge hole (422) is arranged on the end of the swing arm (42) facing the locking and unlocking operation plate (45), a swing arm second hinge hole (423) is arranged on the end of the swing arm (42) facing the locking plate seat (41), a swing arm first hinge pin (4221) is arranged on the swing arm first hinge hole (422), a swing arm second hinge pin (4231) is arranged on the swing arm second hinge hole (423), the swing arm first hinge pin (4221) is hinged below the front end of the locking and unlocking operation plate (45) at a position corresponding to a locking and unlocking operation plate first hinge hole (451) arranged below the front end of the locking and unlocking operation plate (45), and the swing arm second hinge pin (4231) is hinged to the rear end of the locking plate seat (41) at a position corresponding to a locking plate seat upper folding edge hinge hole arranged on the rear end of the locking plate seat upper folding edge of the locking plate seat (41), the rear end of the locking and unlocking operation plate (45) is arranged as a free end for the foot operation of a user, the rear end of the locking tooth plate fixing seat (43) is hinged above the front end of the locking and unlocking operation plate (45) by a locking tooth plate fixing seat hinge pin (431) at a position corresponding to a locking and unlocking operation plate second hinge hole (452) arranged above the front end of the locking and unlocking operation plate (45), the rear end of the locking tooth plate fixing seat (43) is hinged to the locking plate seat upper folding edge of the locking plate seat (41) by a locking tooth plate fixing seat hinge shaft (432), the locking tooth plate (44) corresponds to the locking tooth plate accommodation opening (11), the upper end of the locking tooth plate (44) is fixed to the front end of the locking tooth plate fixing seat (43),And with the lock tooth plate fixed seat (43) constitute vertical, and in the lower end of the lock tooth plate (44) constitute has for with the wheel frame tooth disc lock tooth (211) lock or release lock lock plate tooth (441), the guide post cover (46) with the central position of said bearing (5) fixed, in the central position of the guide post cover (46) constitute has a guide post hole (461) from the upper end to the lower end of the guide post cover (46) through, in the guide post hole (461) is set up a guide post (462) displacement in the upper and lower, in the upper end surface of the guide post (462) central position extends a guide post upper head (4621), and the lower end surface of the central position extends a guide post lower head (4622), guide post upper head (4621) with the lock tooth plate fixed seat (43) towards down one side contact or release contact, guide post lower head (4622) with the rear end of the wheel body lock plate (47) towards up one side contact or release contact, wheel body lock plate (47) of the middle left and right side and in the corresponding position each fixed has a wheel body lock plate hinged ear (471), by hinged ear pin shaft (4711) will wheel body lock plate hinged ear (471) with the wheel frame (2) lock, wheel body lock plate reset spring piece (48) between the wheel frame (2) and the wheel body lock plate (47), and one end of the wheel body lock plate reset spring piece (48) is supported on the wheel frame (2), and the other end is fixed with a spring piece positioning pin (481), the spring piece positioning pin (481) in the position corresponding to the spring piece positioning pin hole (472) opened on the wheel body lock plate (47) extends below the wheel body lock plate (47).

2. The universal caster with brake function according to claim 1, characterized in that: A wheel body left pivot supporting arm (22) extends downward in a longitudinal state at the left side of the wheel carrier (2), and a wheel body right pivot supporting arm (23) also extends downward in a longitudinal state at the right side of the wheel carrier (2), the wheel body left pivot supporting arm (22) and the wheel body right pivot supporting arm (23) correspond to each other left and right and the space between the facing sides is formed as a wheel body insertion cavity (24), the wheel body (3) is pivotally supported between the wheel body left pivot supporting arm (22) and the wheel body right pivot supporting arm (23) in a state corresponding to the wheel body insertion cavity (24); the wheel body (3) is braked or unbraked in the wheel body insertion cavity (24) synchronously while the wheel carrier wheel body brake mechanism (4) provided on the fixed seat (1) is engaged with or disengaged from the wheel carrier gear rack locking teeth (211).

3. The universal caster with brake function according to claim 2, characterized in that: A wheel body left pivot supporting arm pin hole (221) is formed at the lower end of the wheel body left pivot supporting arm (22), and a wheel body right pivot supporting arm pin hole (231) is formed at the lower end of the wheel body right pivot supporting arm (23), the wheel body (3) has a wheel body bearing (32), the wheel body (3) is rotatably arranged on the rotating bearing outer ring of the wheel body bearing (32), and the wheel body bearing center hole (321) of the wheel body bearing (32) corresponds to the wheel body left pivot supporting arm pin hole (221) and the wheel body right pivot supporting arm pin hole (231), the wheel body pin shaft (31) passes through the wheel body left pivot supporting arm pin hole (221), the wheel body bearing center hole (321) and the wheel body right pivot supporting arm pin hole (231) in sequence from left to right, and the non-rotating bearing inner ring of the wheel body bearing (32) is defined by the nut (311) screwed on the right end of the wheel body pin shaft (31).

4. The universal caster with brake function according to claim 1, characterized in that: The fixed seat (1) is in the shape of a rectangular flat plate or a square tube with a cross-sectional shape of a mouth.

5. The universal caster with brake function according to claim 1, characterized in that: A spring sheet supporting limiting notch (212) is formed on the wheel carrier (2) and at a position corresponding to one end of the wheel body locking pressure plate reset spring sheet (48), and the one end of the wheel body locking pressure plate reset spring sheet (48) is supported in the spring sheet supporting limiting notch (212).

6. The universal caster with brake function according to claim 1, characterized in that: The guide column hole (461) is in the shape of a rectangle in cross section, and the guide column (462) is also in the shape of a rectangle in cross section.

7. The universal caster with brake function according to claim 1, characterized in that: The guide column hole (461) is in the shape of a circle in cross section, and the guide column (462) is also in the shape of a circle in cross section.

8. The universal caster with brake function according to claim 1, characterized in that: One or a pair of wheel body contact flanges (473) are provided on the downward side of the front end of the wheel body locking pressure plate (47).

9. The universal caster with brake function according to claim 8, characterized in that: The wheel body contact flanges (473) are in the shape of a spherical cap, and when the number of wheel body contact flanges (473) is a pair, the pair of wheel body contact flanges (473) are distributed left and right or front and back.

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