Multifunctional trundle with front brake and rear brake

Abstract

The invention discloses a multifunctional trundle with front and rear brakes. The multifunctional trundle comprises a fixed seat, a support, a brake assembly and a direction locking assembly. The fixed seat is provided with a direction locking groove; the support is located below the fixed seat and rotationally connected to the fixed seat, a roller is arranged at the lower end of the support, the support is provided with an elastic piece, and the elastic piece is provided with a brake part and a direction locking part; the brake assembly is rotationally connected to the support, and the lower end of the brake assembly abuts against the front end of the elastic piece. The brake assembly rotates to drive the front end of the elastic piece to bend downwards to enable the brake part to be close to and attached to the roller or drive the front end of the elastic piece to rebound to enable the brake part to be away from the roller. The locking assembly is rotationally connected to the support, and the locking assembly rotates to drive the rear end of the elastic piece to bend upwards so that the locking part can be inserted into the locking groove to enable the fixing base and the support to be relatively fixed, or the locking assembly drives the rear end of the elastic piece to rebound so that the locking part can be separated from the locking groove. The multifunctional trundle with the front brake and the rear brake has the locking function and the braking function at the same time, and various daily requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of casters, in particular to a multifunctional caster with front and rear brakes. Background Art

[0002] Some furniture, such as tables, cabinets and chairs, are usually equipped with caster structures to support the furniture and facilitate the movement of the furniture. At present, some casters have brake structures, and some casters are universal wheels, but these casters cannot lock the direction of the casters and cannot meet daily needs. Summary of the invention

[0003] The present invention is intended to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention proposes a front and rear brake multifunctional caster.

[0004] An embodiment of the present invention provides a front and rear brake multifunctional caster, the front and rear brake multifunctional caster comprising:

[0005] A fixing seat, wherein the fixing seat is provided with a locking groove;

[0006] A support, located below the fixing seat, the support is rotatably connected to the fixing seat, a roller is provided at the lower end of the support, the support is provided with a spring sheet, and the spring sheet is provided with a brake portion and a locking portion;

[0007] A brake assembly is rotatably connected to the support, and the lower end of the brake assembly abuts against the front end of the spring sheet; the rotation of the brake assembly can drive the front end of the spring sheet to bend downward so that the brake part is close to the roller, or drive the front end of the spring sheet to rebound so that the brake part is away from the roller;

[0008] A locking component is rotatably connected to the support. The rotation of the locking component can drive the rear end of the spring sheet to bend upward so that the locking portion is inserted into the locking groove so that the fixed seat and the support are relatively fixed, or drive the rear end of the spring sheet to rebound so that the locking portion is separated from the locking groove.

[0009] The front and rear brake multifunctional caster according to the embodiment of the present invention has at least the following technical effects: when the brake part is away from the roller and the locking part is out of the locking groove, the support can rotate relative to the fixed seat, and the roller is in a universal wheel state at this time; when locking is required, the locking component is rotated to make the rear end of the spring sheet bend upwards to drive the locking part to insert into the locking groove, and the fixed seat and the support are relatively fixed, and the roller is kept in one direction at this time; when locking is not required, the locking component is rotated to make the rear end of the spring sheet rebound to drive the locking part out of the locking groove; when braking is required, the brake component is rotated to make the front end of the spring sheet bend downwards to drive the brake part to approach and fit the roller. The front and rear brake multifunctional caster has both locking and braking functions, meeting a variety of daily needs.

[0010] According to some embodiments of the present invention, the brake assembly includes a first rotating shaft and a brake pedal, the first rotating shaft is installed on the support, the brake pedal is rotatably connected to the first rotating shaft, and the lower end of the brake pedal is provided with a first abutting surface and a second abutting surface, and the brake pedal can rotate relative to the first rotating shaft so that the first abutting surface or the second abutting surface abuts against the spring sheet; when the first abutting surface abuts against the spring sheet, the brake part is away from the roller; when the second abutting surface abuts against the spring sheet, the brake part approaches and fits against the roller.

[0011] According to some embodiments of the present invention, the first abutting surface is located on the rear side of the second abutting surface, the front end of the first abutting surface is connected to the rear end of the second abutting surface, and the angle between the first abutting surface and the second abutting surface is an obtuse angle; when the first abutting surface abuts against the spring sheet, the brake part is away from the roller, and the brake pedal, the spring sheet and the support are relatively fixed to achieve self-locking; when the second abutting surface abuts against the spring sheet, the brake part is close to and fits against the roller, and the brake pedal, the spring sheet and the support are relatively fixed to achieve self-locking.

[0012] According to some embodiments of the present invention, a bending portion is provided at the front end of the spring sheet, the bending portion is inclined downward from the back to the front, and the brake portion is provided on the lower end surface of the bending portion.

[0013] According to some embodiments of the present invention, the locking assembly includes a second rotating shaft, a locking pedal and a lifting seat, the support is provided with a first elongated through hole, the lifting seat is provided with a second elongated through hole, the second rotating shaft is simultaneously passed through the first elongated through hole and the second elongated through hole, the second rotating shaft is simultaneously passed through the locking pedal and the spring sheet, and the lower end of the locking pedal abuts against the lifting seat; the rotation of the locking pedal can drive the lifting seat to move in the up and down directions, thereby driving the second rotating shaft to reciprocate in the up and down directions in the first elongated through hole and the second elongated through hole, so that the rear end of the spring sheet and the locking portion move in the up and down directions.

[0014] According to some embodiments of the present invention, a third abutment surface and a fourth abutment surface are provided at the lower end of the locking pedal, and the locking pedal rotates relative to the second rotating shaft so that the third abutment surface or the fourth abutment surface abuts against the lifting seat; when the third abutment surface abuts against the lifting seat, the second rotating shaft abuts against the lower end of the second elongated through hole, and the locking portion disengages from the locking groove; when the fourth abutment surface abuts against the lifting seat, the second rotating shaft abuts against the upper end of the second elongated through hole, and the locking portion is inserted into the locking groove.

[0015] According to some embodiments of the present invention, the third abutting surface is located on the front side of the fourth abutting surface, the rear end of the third abutting surface is connected to the front end of the fourth abutting surface, and the angle between the third abutting surface and the fourth abutting surface is an obtuse angle; when the third abutting surface abuts against the lifting seat, the locking pedal, the lifting seat, the spring sheet and the support are relatively fixed to achieve self-locking; when the fourth abutting surface abuts against the lifting seat, the locking pedal, the lifting seat, the spring sheet and the support are relatively fixed to achieve self-locking.

[0016] According to some embodiments of the present invention, the locking pedal is provided with a limiting portion, and when the locking pedal rotates along the first direction so that the lifting seat abuts against the fourth abutting surface, the limiting portion abuts against the lifting seat to limit the locking pedal from continuing to rotate along the first direction.

[0017] According to some embodiments of the present invention, the locking assembly also includes a third rotating shaft, the third rotating shaft is passed through the support, the third rotating shaft is located below the second rotating shaft, the lifting seat is provided with a third long through hole, the third rotating shaft is passed through the third long through hole, and the third long through hole extends in the up and down directions.

[0018] According to some embodiments of the present invention, a fixing plate is provided at the lower end of the fixing seat, the lower end of the fixing plate is passed through and rotatably connected to the support, a plurality of locking grooves are provided on the outer side of the fixing plate, the plurality of locking grooves are distributed circumferentially along the fixing plate, and the locking portion is provided on the upper end surface of the spring sheet.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of the structure of front and rear brake multifunctional casters according to some embodiments of the present invention;

[0022] Figure 2 is an exploded view of front and rear brake multifunctional casters according to some embodiments of the present invention;

[0023] Figure 3 is a schematic diagram of the structure of a brake pedal in some embodiments of the present invention;

[0024] Figure 4 is a schematic diagram of the structure of a locking pedal according to some embodiments of the present invention;

[0025] Figure 5is a schematic structural diagram of front and rear brake multifunctional casters in a locked state in some embodiments of the present invention;

[0026] Figure 6 is a schematic structural diagram of front and rear brake multifunctional casters in a braking state in some embodiments of the present invention;

[0027] Figure 7 It is a structural schematic diagram of some embodiments of the present invention in which the front and rear brake multifunctional casters are in a locking state and a braking state at the same time.

[0028] Figure Number:

[0029] A fixing seat 100, a fixing plate 110, and a locking groove 111;

[0030] The support 200, the first long through hole 201, the roller 210, the spring 220, the brake part 221, the locking part 222, and the bending part 230;

[0031] Braking assembly 300, first rotating shaft 310, brake pedal 320, first abutting surface 321, second abutting surface 322;

[0032] The locking assembly 400 , the second rotating shaft 410 , the locking pedal 420 , the third abutting surface 421 , the fourth abutting surface 422 , the lifting seat 430 , the second long through hole 431 , the third long through hole 432 , the limiting portion 440 , and the third rotating shaft 450 . DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0038] According to some embodiments of the present invention, referring to Figures 1 to 7 The front and rear brake multifunctional caster comprises a fixing seat 100, a support 200, a brake assembly 300 and a locking assembly 400. A locking groove 111 is provided at the lower end of the fixing seat 100. The support 200 is located below the fixing seat 100, and the support 200 is rotatably connected to the fixing seat 100. A roller 210 is provided at the lower end of the support 200. The support 200 is provided with a spring piece 220, and a brake part 221 is provided at the front end of the spring piece 220, and a locking part 222 is provided at the rear end of the spring piece 220. The brake assembly 300 is rotatably connected to the support 200, and the brake assembly 300 is located at the front side of the support 200, and the lower end of the brake assembly 300 abuts against the front end of the spring piece 220. Rotating the brake assembly 300 can drive the front end of the spring piece 220 to bend downward so that the brake part 221 is close to the roller 210, or drive the front end of the spring piece 220 to rebound so that the brake part 221 is away from the roller 210. The locking assembly 400 is rotatably connected to the support 200, and the locking assembly 400 is located on the rear side of the support 200. Rotating the locking assembly 400 can drive the rear end of the spring sheet 220 to bend upward so that the locking portion 222 is inserted into the locking groove 111, thereby making the fixed base 100 and the support 200 relatively fixed; or drive the rear end of the spring sheet 220 to rebound, so that the locking portion 222 is disengaged from the locking groove 111.

[0039] When the braking portion 221 is away from the roller 210 and the locking portion 222 is separated from the locking groove 111 , the support 200 can rotate relative to the fixing base 100 , and the roller 210 is in a universal wheel state at this time.

[0040] When locking is required, the locking assembly 400 is rotated to bend the rear end of the spring 220 upward to drive the locking portion 222 to insert into the locking groove 111, and the fixing seat 100 and the support 200 are relatively fixed. At this time, the roller 210 remains in one direction.

[0041] When locking is not required, the locking assembly 400 is rotated to make the rear end of the spring sheet 220 rebound, thereby driving the locking portion 222 to separate from the locking groove 111 .

[0042] When braking is required, the brake assembly 300 is rotated to bend the front end of the spring sheet 220 downward, thereby driving the brake portion 221 to be close to and in contact with the roller 210 .

[0043] When braking is not needed, the brake assembly 300 is rotated to make the front end of the spring sheet 220 rebound, thereby driving the brake portion 221 away from the roller 210 .

[0044] The multifunctional casters with front and rear brakes have both locking and braking functions to meet a variety of daily needs.

[0045] According to some embodiments of the present invention, referring to Figures 2 to 7 The brake assembly 300 includes a first rotating shaft 310 and a brake pedal 320. The axial direction of the first rotating shaft 310 is the left-right direction. The first rotating shaft 310 is installed on the support 200. The brake pedal 320 is rotatably connected to the first rotating shaft 310. The lower end of the brake pedal 320 is provided with a first abutting surface 321 and a second abutting surface 322. The brake pedal 320 can rotate relative to the first rotating shaft 310 so that the first abutting surface 321 or the second abutting surface 322 abuts against the spring sheet 220; when the first abutting surface 321 abuts against the spring sheet 220, the brake part 221 is away from the roller 210; when the second abutting surface 322 abuts against the spring sheet 220, the brake part 221 is close to and fits against the roller 210. Preferably, the first abutting surface 321 is located at the rear side of the second abutting surface 322, the front end of the first abutting surface 321 is connected to the rear end of the second abutting surface 322, and the angle between the first abutting surface 321 and the second abutting surface 322 is an obtuse angle; when the first abutting surface 321 abuts against the spring sheet 220, the brake portion 221 is away from the roller 210, and the brake pedal 320, the spring sheet 220 and the support 200 are relatively fixed to achieve self-locking; when the second abutting surface 322 abuts against the spring sheet 220, the brake portion 221 is close to and fits the roller 210, and the brake pedal 320, the spring sheet 220 and the support 200 are relatively fixed to achieve small-angle self-locking. When it is necessary to switch between the spring sheet 220 abutting against the first abutting surface 321 and the second abutting surface 322, the self-locking force can be overcome by rotating the brake pedal 320 to apply an external force to switch. The distance between the first rotating shaft 310 and the first abutting surface 321 is smaller than the distance between the first rotating shaft 310 and the second abutting surface 322 .

[0046] It is understandable that, referring to Figure 5 and Figure 6 When the brake pedal 320 rotates counterclockwise, so that the spring piece 220 changes from abutting the first abutting surface 321 to abutting the second abutting surface 322, the front end of the spring piece 220 is subjected to downward pressure, so that the brake part 221 is attached to the roller 210, thereby braking the roller 210, so that the front and rear brake multifunctional caster is in a braking state. When the brake pedal 320 rotates clockwise, so that the spring piece 220 changes from abutting the second abutting surface 322 to abutting the first abutting surface 321, the front end of the spring piece 220 is no longer subjected to the pressure of the brake pedal 320, and the front end of the spring piece 220 rebounds, so that the brake part 221 is away from the roller 210.

[0047] Preferably, refer to Figure 2 A bending portion 230 is provided at the front end of the spring piece 220 . The bending portion 230 is inclined downward from the back to the front. A brake portion 221 is provided at the lower end surface of the bending portion 230 .

[0048] According to some embodiments of the present invention, referring to Figure 2 , Figures 4 to 7 The locking assembly 400 includes a second rotating shaft 410, a locking pedal 420 and a lifting seat 430. The axis direction of the second rotating shaft 410 is the left-right direction. The support 200 is provided with a first long through hole 201, and the lifting seat 430 is provided with a second long through hole 431. The first long through hole 201 and the second long through hole 431 are both extended in the up-down direction. The second rotating shaft 410 is simultaneously penetrated through the first long through hole 201 and the second long through hole 431. The second rotating shaft 410 is simultaneously penetrated through the locking pedal 420 and the spring 220. The lower end of the locking pedal 420 abuts against the lifting seat 430. The rotation of the locking pedal 420 can drive the lifting seat 430 to move in the up-down direction, thereby driving the second rotating shaft 410 to reciprocate along the extension direction of the second long through hole 431, so that the rear end of the spring 220 and the locking portion 222 move in the up-down direction.

[0049] Preferably, refer to Figures 4 to 7 The lower end of the locking pedal 420 is provided with a third abutting surface 421 and a fourth abutting surface 422. The locking pedal 420 rotates relative to the second rotating shaft 410 so that the third abutting surface 421 or the fourth abutting surface 422 abuts against the lifting seat 430; when the third abutting surface 421 abuts against the lifting seat 430, the second rotating shaft 410 abuts against the lower end of the second long through hole 431, and the locking portion 222 disengages from the locking groove 111; when the fourth abutting surface 422 abuts against the lifting seat 430, the second rotating shaft 410 abuts against the upper end of the second long through hole 431, and the locking portion 222 is inserted into the locking groove 111. The third abutting surface 421 is located at the front side of the fourth abutting surface 422, the rear end of the third abutting surface 421 is connected to the front end of the fourth abutting surface 422, and the angle between the third abutting surface 421 and the fourth abutting surface 422 is an obtuse angle; when the third abutting surface 421 abuts against the lifting seat 430, the locking pedal 420, the lifting seat 430, the spring 220 and the support 200 are relatively fixed to achieve a small angle self-locking; when the fourth abutting surface 422 abuts against the lifting seat 430, the locking pedal 420, the lifting seat 430, the spring 220 and the support 200 are relatively fixed to achieve a small angle self-locking. When it is necessary to switch between the lifting seat 430 abutting against the third abutting surface 421 and the fourth abutting surface 422, the self-locking force can be overcome by rotating the locking pedal 420 to apply an external force to switch. The distance between the second rotating shaft 410 and the third abutting surface 421 is smaller than the distance between the second rotating shaft 410 and the fourth abutting surface 422 .

[0050] It is understandable that, referring to Figure 2 , Figures 4 to 7 When the locking pedal 420 rotates in the clockwise direction, the upper contact surface of the lifting seat 430 changes from contacting the third contact surface 421 to contacting the fourth contact surface 422, that is, Figure 6 Convert to Figure 5 In the locked state, the distance between the second rotating shaft 410 and the upper abutting surface of the lifting seat 430 increases, thereby driving the second rotating shaft 410 to move upward relative to the second long through hole 431, thereby driving the lifting seat 430 and the rear end of the spring piece 220 to move upward, so that the locking portion 222 of the spring piece 220 is inserted upward into the locking groove 111, so that the support 200 cannot rotate relative to the fixing seat 100, and the front and rear brake multi-functional casters are in a locked state.

[0051] It is also understandable that, with reference to Figure 2 , Figures 4 to 7 When the locking pedal 420 rotates counterclockwise, the upper contact surface of the lifting seat 430 changes from contacting with the fourth contact surface 422 to contacting with the third contact surface 421, that is, Figure 5 Convert to Figure 6 In the engaged state, the distance between the second rotating shaft 410 and the upper abutting surface of the lifting seat 430 is reduced, thereby driving the second rotating shaft 410 to move downward relative to the second long through hole 431, thereby driving the lifting seat 430 and the rear end of the spring piece 220 to move downward, so that the locking portion 222 of the spring piece 220 disengages downward from the locking groove 111, so that the support 200 can rotate relative to the fixing seat 100.

[0052] According to some embodiments of the present invention, referring to Figure 2 , Figure 4 and Figure 5 The locking pedal 420 is provided with a limiting portion 440. When the locking pedal 420 rotates in the first direction to make the lifting seat 430 abut against the fourth abutting surface 422, the limiting portion 440 abuts against the lifting seat 430 to limit the locking pedal 420 from continuing to rotate in the first direction, thereby playing a limiting role. In this embodiment, the first direction is the clockwise direction.

[0053] According to some embodiments of the present invention, referring to Figure 2 and Figure 5 The locking assembly 400 also includes a third rotating shaft 450, which is penetrated by the support 200 and is located below the second rotating shaft 410. The lifting seat 430 is provided with a third long through hole 432, and the third rotating shaft 450 is penetrated by the third long through hole 432. The third long through hole 432 extends in the up-down direction. The third rotating shaft 450 can ensure that the lifting seat 430 moves in the up-down direction to prevent the lifting seat 430 from deviating.

[0054] It can also be understood that the third rotating shaft 450 can limit the lowest height position of the lifting seat 430. Figure 2 , Figures 4 to 7 When the locking pedal 420 rotates in the clockwise direction, the upper contact surface of the lifting seat 430 changes from contacting the third contact surface 421 to contacting the fourth contact surface 422, that is, Figure 6 Convert to Figure 5 In the state, the distance between the second rotating shaft 410 and the upper contact surface of the lifting seat 430 increases, thereby driving the second rotating shaft 410 to move upward relative to the second elongated through hole 431. Since the third rotating shaft 450 restricts the lifting seat 430 from moving downward, and the distance between the second rotating shaft 410 and the upper contact surface of the lifting seat 430 increases, the second rotating shaft 410 exerts an upward force on the lifting seat 430, thereby driving the lifting seat 430 and the rear end of the spring sheet 220 to move upward, so that the locking portion 222 of the spring sheet 220 is inserted upward into the locking groove 111.

[0055] According to some embodiments of the present invention, referring to Figure 2 The lower end of the fixed seat 100 is provided with a fixed disk 110, the lower end of the fixed disk 110 is penetrated and rotatably connected to the support 200, the outer side of the fixed disk 110 is provided with a plurality of locking grooves 111, the plurality of locking grooves 111 are distributed along the circumference of the fixed disk 110, and the upper end surface of the spring piece 220 is provided with a locking portion 222. It can be understood that when the roller 210 turns to a certain angle, the locking portion 222 can be inserted into one of the locking grooves 111 to lock the direction, and the plurality of locking grooves 111 can provide a variety of directions of the roller 210 after locking, so as to meet a variety of needs.

[0056] In the description of this specification, the description with reference to the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multifunctional caster with front and rear brakes, characterized in that: include: A fixing seat (100), wherein the fixing seat (100) is provided with a locking groove (111); A support (200) is located below the fixing base (100), the support (200) is rotatably connected to the fixing base (100), a roller (210) is provided at the lower end of the support (200), the support (200) is provided with a spring sheet (220), and the spring sheet (220) is provided with a brake portion (221) and a locking portion (222); A brake assembly (300) is rotatably connected to the support (200), and the lower end of the brake assembly (300) is in contact with the front end of the spring sheet (220); the rotation of the brake assembly (300) can drive the front end of the spring sheet (220) to bend downward so that the brake part (221) is close to and fits the roller (210), or drive the front end of the spring sheet (220) to rebound so that the brake part (221) is away from the roller (210); A locking component (400) is rotatably connected to the support (200). The rotation of the locking component (400) can drive the rear end of the spring sheet (220) to bend upward so that the locking portion (222) is inserted into the locking groove (111) so that the fixed seat (100) and the support (200) are relatively fixed, or drive the rear end of the spring sheet (220) to rebound so that the locking portion (222) is separated from the locking groove (111).

2. The multifunctional caster with front and rear brakes according to claim 1, characterized in that: The brake assembly (300) includes a first rotating shaft (310) and a brake pedal (320), wherein the first rotating shaft (310) is installed on the support (200), and the brake pedal (320) is rotatably connected to the first rotating shaft (310), and a first abutting surface (321) and a second abutting surface (322) are provided at the lower end of the brake pedal (320), and the brake pedal (320) can be rotated relative to the first rotating shaft (310) so that the first abutting surface (321) or the second abutting surface (322) abuts against the spring sheet (220); when the first abutting surface (321) abuts against the spring sheet (220), the brake portion (221) moves away from the roller (210); when the second abutting surface (322) abuts against the spring sheet (220), the brake portion (221) approaches and fits against the roller (210).

3. The multifunctional caster with front and rear brakes according to claim 2, characterized in that: The first abutting surface (321) is located at the rear side of the second abutting surface (322), the front end of the first abutting surface (321) is connected to the rear end of the second abutting surface (322), and the angle between the first abutting surface (321) and the second abutting surface (322) is an obtuse angle; when the first abutting surface (321) abuts against the spring sheet (220), the brake part (221) is away from the roller (210), and the brake pedal (320), the spring sheet (220) and the support (200) are relatively fixed to achieve self-locking; when the second abutting surface (322) abuts against the spring sheet (220), the brake part (221) is close to and fits against the roller (210), and the brake pedal (320), the spring sheet (220) and the support (200) are relatively fixed to achieve self-locking.

4. The multifunctional caster with front and rear brakes according to claim 2, characterized in that: A bending portion (230) is provided at the front end of the spring sheet (220), the bending portion (230) is inclined downward from the back to the front, and the brake portion (221) is provided at the lower end surface of the bending portion (230).

5. The multifunctional caster with front and rear brakes according to claim 1, characterized in that: The locking assembly (400) comprises a second rotating shaft (410), a locking pedal (420) and a lifting seat (430); the support (200) is provided with a first long through hole (201); the lifting seat (430) is provided with a second long through hole (431); the second rotating shaft (410) is simultaneously penetrated through the first long through hole (201) and the second long through hole (431); the second rotating shaft (410) is simultaneously penetrated through the locking pedal (420) and the spring sheet (220), the lower end of the locking pedal (420) abuts against the lifting seat (430); the locking pedal (420) can rotate to drive the lifting seat (430) to move in the up-down direction, thereby driving the second rotating shaft (410) to reciprocate in the up-down direction in the first long through hole (201) and the second long through hole (431), so that the rear end of the spring sheet (220) and the locking portion (222) move in the up-down direction.

6. The multifunctional caster with front and rear brakes according to claim 5, characterized in that: The lower end of the locking pedal (420) is provided with a third abutting surface (421) and a fourth abutting surface (422); the locking pedal (420) rotates relative to the second rotating shaft (410) so that the third abutting surface (421) or the fourth abutting surface (422) abuts against the lifting seat (430); when the third abutting surface (421) abuts against the lifting seat (430), the second rotating shaft (410) abuts against the lower end of the second long through hole (431), and the locking portion (222) disengages from the locking groove (111); when the fourth abutting surface (422) abuts against the lifting seat (430), the second rotating shaft (410) abuts against the upper end of the second long through hole (431), and the locking portion (222) is inserted into the locking groove (111).

7. The multifunctional caster with front and rear brakes according to claim 6, characterized in that: The third abutting surface (421) is located at the front side of the fourth abutting surface (422), the rear end of the third abutting surface (421) is connected to the front end of the fourth abutting surface (422), and the angle between the third abutting surface (421) and the fourth abutting surface (422) is an obtuse angle; when the third abutting surface (421) abuts against the lifting seat (430), the locking pedal (420), the lifting seat (430), the spring sheet (220) and the support (200) are relatively fixed to achieve self-locking; when the fourth abutting surface (422) abuts against the lifting seat (430), the locking pedal (420), the lifting seat (430), the spring sheet (220) and the support (200) are relatively fixed to achieve self-locking.

8. The multifunctional caster with front and rear brakes according to claim 6, characterized in that: The locking pedal (420) is provided with a limiting portion (440). When the locking pedal (420) rotates in a first direction so that the lifting seat (430) abuts against the fourth abutting surface (422), the limiting portion (440) abuts against the lifting seat (430) to limit the locking pedal (420) from continuing to rotate in the first direction.

9. The multifunctional caster with front and rear brakes according to claim 5, characterized in that: The locking assembly (400) also includes a third rotating shaft (450), which is passed through the support (200) and is located below the second rotating shaft (410). The lifting seat (430) is provided with a third long through hole (432), and the third rotating shaft (450) is passed through the third long through hole (432), and the third long through hole (432) extends in the up and down directions.

10. The multifunctional caster with front and rear brakes according to claim 1, characterized in that: A fixing plate (110) is provided at the lower end of the fixing seat (100), the lower end of the fixing plate (110) is passed through and rotatably connected to the support (200), a plurality of locking grooves (111) are provided on the outer side of the fixing plate (110), the plurality of locking grooves (111) are distributed along the circumference of the fixing plate (110), and the locking portion (222) is provided on the upper end surface of the spring sheet (220).

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