Trundle with improved locking mechanism

Abstract

The utility model discloses a caster with an improved locking mechanism, which comprises a shell, a pulley component and a locking component, the pulley component and the locking component are mounted in the shell, a pulley mounting cavity and a locking mounting cavity are arranged in the shell, openings are arranged on the lower portions of the pulley mounting cavity and the locking mounting cavity, the pulley component is arranged in the pulley mounting cavity, and the locking component is arranged in the locking mounting cavity. The locking assembly is arranged in the locking installation cavity, a wheel is rotationally installed on the pulley assembly, and the lower edge of the wheel protrudes out of the lower end face of the shell downwards. The pulley assembly and the locking assembly are independently arranged, during locking, the locking switch is pressed downwards to rotate downwards to push the locking supporting feet to move downwards, so that the locking supporting feet make contact with the ground, the wheels are separated from the ground, the contact area between the locking supporting feet and the ground is increased, friction force and stability are improved, and the service life of the wheels is prolonged. The wheel does not need to be in contact with the wheel during locking, the wheel is only in contact with the ground to be stressed during moving, and the wheel is suspended without being stressed during locking, so that the service life of the wheel is prolonged, and the reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casters, in particular to a caster with an improved locking mechanism. Background Art

[0002] In order to facilitate the movement of the clothes drying rack, casters with a locking mechanism are often installed at the bottom of the clothes drying rack. The locking mechanism of the existing casters drives the brake pads to press tightly on the wheels by rotating the locking switch, thereby limiting the rotation of the wheels to achieve the purpose of locking. However, in order to improve the quietness and shock absorption during movement, the wheels are often made of rubber, while the brake pads are made of metal. In order to ensure the locking force, the brake pads need to press the wheels with greater force. Long-term locking can easily cause the wheels to deform, reduce the roundness of the wheels, and cause bumps and jams during movement. The service life of the wheels is short, and the reliability and stability are poor. Whether locked or moving, the wheels always keep in contact with the ground, and the clothes drying rack is fixed only by the friction between the wheels and the ground, resulting in poor wind resistance of the clothes drying rack, and easy displacement and tilting. In addition, most of the wheels of this structure are exposed to the outside, and the appearance is poor. Therefore, it is necessary to improve it. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a caster with an improved locking mechanism, which does not contact the wheel when locked, thereby increasing the service life of the wheel, increasing the friction between the caster and the ground when locked, improving stability and reliability, and saving more effort when locked.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a caster with an improved locking mechanism, comprising a housing and a pulley assembly and a locking assembly installed in the housing, a pulley installation chamber and a locking installation chamber are provided in the housing, the lower parts of the pulley installation chamber and the locking installation chamber are both provided with openings, the pulley assembly is arranged in the pulley installation chamber, the locking assembly is arranged in the locking installation chamber, a wheel is rotatably installed in the pulley assembly, and the lower edge of the wheel protrudes downward from the lower end surface of the housing;

[0005] The locking assembly includes a locking switch, a locking foot and an elastic reset member. The locking foot is slidably installed in the locking installation chamber. One end of the locking switch is set as a connecting end and the other end is set as an operating end. The connecting end is rotatably installed in the locking installation chamber, and the operating end extends to the outside of the shell. The locking switch is located above the locking foot and cooperates with the locking foot. The elastic reset member is arranged between the locking switch and the locking foot to realize driving the locking foot to reset upward.

[0006] The locking switch is provided with an upper limit clamping portion, the locking foot is provided with a lower limit clamping portion, the locking foot is provided with an unlocking position and a locking position, when the locking foot is in the unlocking position, the lower end surface of the locking foot is higher than the lower edge of the wheel in vertical height, when the locking foot is in the locking position, the lower end surface of the locking foot is lower than the lower edge of the wheel in vertical height, and the upper limit clamping portion is snap-connected with the lower limit clamping portion.

[0007] In a further technical solution, the locking switch includes a connecting plate and an operating plate, which are integrally formed to form an "L"-shaped locking switch, the connecting end is arranged on the connecting plate, the operating end is arranged on the operating plate, the upper limit clamping portion is arranged on the lower part of the operating plate, and the lower limit clamping portion is arranged on the upper part of the locking leg. When the locking leg is in the locking position, the lower part of the operating plate abuts against the upper part of the locking leg.

[0008] In a further technical solution, a reset avoidance groove is opened in the middle of the connecting plate, and a connecting shaft passing through the reset avoidance groove is provided at the connecting end. The connecting shaft is rotatably installed in the locking installation chamber. The elastic reset member adopts a tension spring, the upper end of the tension spring is connected to the middle part of the connecting shaft, and the lower end of the tension spring is connected to the locking support foot.

[0009] In a further technical solution, an upper pressing arc surface is provided at the connection between the connecting plate and the operating plate, and a lower pressing arc surface is provided on the upper part of the corresponding locking leg. The upper pressing arc surface and the lower pressing arc surface are pressed together, and the length of the connecting plate is smaller than the length of the operating plate.

[0010] In a further technical solution, the locking foot is provided with an inner cavity with an opening facing upward, and the inner cavity is provided with two locking ribs arranged at intervals, a reset rib plate is arranged between the two locking ribs, and the two locking ribs are both provided with a lower pressing arc surface, the two locking ribs and the reset ribs are respectively provided with lower limit clamping parts, the reset rib plate is provided with a hanging hole passing through the reset rib plate, the upper end of the tension spring is hooked on the middle part of the connecting shaft, and the lower end of the tension spring passes through the reset avoidance groove and is hooked on the hanging hole, a limiting slide groove is provided on one side of the outer shell, the limiting slide groove is connected with the locking installation chamber, a locking avoidance groove is provided on the side of the locking foot facing the limiting slide groove, the operating end of the operating panel passes through the locking avoidance groove and the limiting slide groove in turn and extends out of the outer shell, and the operating panel is limitedly matched with the limiting slide groove.

[0011] In a further technical solution, an anti-skid limit plate is provided at the lower part of the locking leg, the outer diameter of the anti-skid limit plate is larger than the inner diameter of the locking installation chamber, and the anti-skid limit plate cooperates with the outer shell to limit the position.

[0012] In a further technical solution, the upper limit snap-fitting portion is a downwardly protruding snap-fitting portion, the cross-sectional shape of the snap-fitting portion is a semicircular snap-fitting portion, and the lower limit snap-fitting portion is a downwardly recessed snap-fitting slot, and the snap-fitting portion is snap-fitted with the snap-fitting slot when the locking leg is in the locking position.

[0013] In a further technical solution, the pulley assembly includes a pulley support, a rotating connecting rod and a wheel. The upper end of the rotating connecting rod is rotatably mounted on the upper wall of the pulley mounting chamber, and the lower end of the rotating connecting rod is fixedly connected to the lower portion of the pulley support. The lower portion of the pulley support is provided with an installation groove, and the installation groove is laterally provided with a rotating shaft. The wheel is rotatably mounted on the rotating shaft, and a rotating gap is provided between the pulley assembly and the inner wall of the pulley mounting chamber.

[0014] In a further technical solution, a rotary bearing is arranged on the rotary connecting rod, a bearing embedding groove is arranged on the upper part of the pulley mounting chamber, and the rotary bearing is embedded in the bearing embedding groove.

[0015] In a further technical solution, the outer shell includes a first shell and a second shell, the first shell and the second shell are interlocked, the lower parts of the first shell and the second shell are enclosed to form a pulley installation chamber and a locking installation chamber, and the upper parts of the first shell and the second shell are enclosed to form a connecting chamber, and an opening is provided at the upper part of the connecting chamber.

[0016] After adopting the above structure, the advantages of the utility model over the prior art are as follows: the pulley assembly and the locking assembly are independently arranged, and when locking, the operating end of the locking switch is pressed downward to rotate the locking switch downward to push the locking foot to move downward, so that the locking foot contacts the ground and separates the wheel from the ground, and the locking foot contacts the ground for support, thereby increasing the contact area with the ground, improving the friction and improving the stability; when locking, there is no need to contact the wheel, and the wheel is only in contact with the ground during movement and is subjected to force, and when locked, the wheel is suspended in the air without being subjected to force, thereby extending the service life of the wheel and improving the reliability; when locked, the wheel is The upper limit clamping part and the lower limit clamping part are connected by a buckle to limit the locking switch to prevent the locking switch from being accidentally rotated and unlocked. The structure is simple, the cost is low, and the reliability is high. When unlocking, the locking switch is rotated upward to separate the upper limit clamping part from the lower limit clamping part. Under the action of the elastic reset member, the locking foot moves upward and separates from the ground and contacts the wheel with the ground, thereby moving. The locking switch is pressed downward to lock, and the locking switch is rotated upward to unlock. The operation is more convenient and labor-saving. The wheel is hidden in the shell, and only the lower edge of the wheel protrudes from the shell, which not only protects the wheel but also improves the aesthetics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the hidden second shell of the utility model;

[0020] Figure 3It is an exploded view of the utility model;

[0021] Figure 4 It is a schematic diagram of the state of the locking leg of the utility model when it is in the locking position;

[0022] Figure 5 It is a schematic diagram of the state of the locking leg of the utility model when it is in the unlocking position.

[0023] In the figure:

[0024] 1 housing, 11 first housing, 12 second housing, 13 pulley installation chamber, 14 locking installation chamber, 15 connecting chamber, 16 limiting sliding groove, 17 bearing embedding groove;

[0025] 2 pulley assembly, 21 wheel, 22 pulley support, 221 mounting groove, 222 rotating shaft, 23 rotating connecting rod, 24 rotating bearing;

[0026] 3 locking assembly, 31 locking switch, 311 connecting plate, 312 connecting end, 313 resetting avoidance groove, 314 connecting shaft, 315 operating plate, 316 operating end, 317 upper limit clamping part, 318 upper pressing arc surface, 32 locking support foot, 321 inner cavity, 322 locking rib plate, 323 lower limit clamping part, 324 lower pressing arc surface, 325 resetting rib plate, 326 hanging hole, 327 locking avoidance groove, 328 anti-slip limit plate, 33 elastic resetting member. DETAILED DESCRIPTION

[0027] The following are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention.

[0028] A caster with an improved locking mechanism, such as Figures 1 to 5As shown, it includes a housing 1 and a pulley assembly 2 and a locking assembly 3 installed in the housing 1. The housing 1 is provided with a pulley installation chamber 13 and a locking installation chamber 14. The lower parts of the pulley installation chamber 13 and the locking installation chamber 14 are both provided with openings. The pulley assembly 2 is arranged in the pulley installation chamber 13, and the locking assembly 3 is arranged in the locking installation chamber 14. The pulley assembly 2 is rotatably installed with a wheel 21, and the lower edge of the wheel 21 protrudes downward from the lower end surface of the housing 1; the locking assembly 3 includes a locking switch 31, a locking foot 32 and an elastic reset member 33. The locking foot 32 is slidably installed in the locking installation chamber 14 up and down. One end of the locking switch 31 is set as a connecting end 312, and the other end is set as an operating end 316. The connecting end 312 is rotatably installed in the locking installation chamber When the locking foot 32 is in the unlocking position, the lower end face of the locking foot 32 is higher than the lower edge of the wheel 21 in the vertical direction, and when the locking foot 32 is in the locking position, the lower end face of the locking foot 32 is higher than the lower edge of the wheel 21 in the vertical direction, and the upper limit clamping portion 317 is connected with the lower limit clamping portion 323 by snapping.

[0029] The locking mechanism of the conventional caster is to lock by limiting the rotation of the wheel 21, so that the wheel 21 always keeps in contact with the ground, resulting in a short service life of the wheel 21, a small contact area between the wheel 21 and the ground, and poor stability. The pulley assembly 2 and the locking assembly 3 of the utility model are independently arranged. When locking, Figure 4 The locking foot 32 is pressed downward to push the locking foot 32 to move downward, so that the locking foot 32 contacts the ground and separates the wheel 21 from the ground. The locking foot 32 contacts the ground for support, thereby increasing the contact area with the ground, improving friction and improving stability. When locking, there is no need to contact the wheel 21. The wheel 21 is only in contact with the ground during movement and is subjected to force. When locked, the wheel 21 is suspended in the air and is not subjected to force, thereby extending the service life of the wheel 21 and improving reliability. When locked, the locking switch 31 is limited by the upper limit clamping portion 317 and the lower limit clamping portion 323 to prevent the locking switch 31 from accidentally rotating and unlocking. The structure is simple, the cost is low, and the reliability is high. When unlocking, Figure 5As shown, the locking switch 31 is rotated upward to separate the upper limit clamping portion 317 from the lower limit clamping portion 323. Under the action of the elastic return member 33, the locking leg 32 moves upward to separate from the ground and contacts the wheel 21 with the ground, thereby moving. The locking switch 31 is pressed downward to lock, and the locking switch 31 is rotated upward to unlock, which is more convenient and labor-saving to operate. The wheel 21 is hidden in the shell 1, and only the lower edge of the wheel 21 protrudes from the shell 1, which can not only protect the wheel 21 but also improve the aesthetics.

[0030] Specifically, the locking switch 31 includes a connecting plate 311 and an operating plate 315. The connecting plate 311 and the operating plate 315 are integrally formed to form an "L"-shaped locking switch 31. The connecting end 312 is arranged on the connecting plate 311, the operating end 316 is arranged on the operating plate 315, the upper limit clamping portion 317 is arranged on the lower part of the operating plate 315, and the lower limit clamping portion 323 is arranged on the upper part of the locking leg 32. When the locking leg 32 is in the locking position, the lower part of the operating plate 315 presses against the upper part of the locking leg 32. The "L"-shaped locking switch 31 drives the locking foot 32 to move by pressing against the connection between the connecting plate 311 and the operating plate 315 when rotating. During the rotation of the locking switch 31, the contact area between the locking switch 31 and the locking foot 32 is reduced, thereby increasing the pressure on the locking foot 32, making locking more labor-saving. After locking, the operating plate 315 presses against the locking foot 32 to increase the contact area, increase the locking force, and improve reliability and stability.

[0031] Specifically, a reset avoidance groove 313 is provided in the middle of the connecting plate 311, and a connecting shaft 314 penetrating the reset avoidance groove 313 is provided at the connecting end 312. The connecting shaft 314 is rotatably mounted in the locking mounting chamber 14. The elastic reset member 33 adopts a tension spring, the upper end of which is connected to the middle of the connecting shaft 314, and the lower end of which is connected to the locking leg 32. When the locking leg 32 moves downward, the tension spring is deformed to generate elastic potential energy. When unlocked, the locking leg 32 is moved upward and reset under the tension of the tension spring, thereby completing unlocking, with a simple structure and low cost.

[0032] Specifically, an upper pressing arc surface 318 is provided at the connection between the connecting plate 311 and the operating plate 315, and a lower pressing arc surface 324 is provided at the upper part of the corresponding locking leg 32. The upper pressing arc surface 318 and the lower pressing arc surface 324 are pressed and matched, and the length of the connecting plate 311 is smaller than the length of the operating plate 315. The upper pressing arc surface 318 can play a guiding role when the locking leg 32 rotates to prevent jamming and further reduce the contact area with the locking leg 32. After locking, the contact area with the upper pressing arc surface 318 can be increased through the lower pressing arc surface 324, further increasing the contact area between the locking switch 31 and the locking leg 32, thereby increasing the locking force.

[0033] Specifically, the locking leg 32 is provided with an inner cavity 321 with an opening facing upward, and the inner cavity 321 is provided with two locking ribs 322 arranged at intervals, and a reset rib 325 is provided between the two locking ribs 322, and the two locking ribs 322 are provided with a lower pressing arc surface 324, and the two locking ribs 322 and the reset ribs 325 are respectively provided with a lower limit clamping portion 323, and the reset rib 325 is provided with a hanging hole 326 that penetrates the reset rib 325. It is arranged in the middle of the connecting shaft 314, the lower end of the tension spring passes through the reset avoidance groove 313 and is hooked on the hanging hole 326, a limited sliding groove 16 is provided on one side of the housing 1, the limited sliding groove 16 is communicated with the locking installation chamber 14, a locking avoidance groove 327 is provided on the side of the locking leg 32 facing the limited sliding groove 16, the operating end 316 of the operating plate 315 passes through the locking avoidance groove 327 and the limited sliding groove 16 in sequence and extends out of the housing 1, and the operating plate 315 is limitedly matched with the limited sliding groove 16. The locking leg 32 is provided with an inner cavity 321 to reduce the weight of the locking leg 32, simplify the structure, and reduce the cost, and the structural strength of the locking leg 32 is increased by the locking rib plate 322 and the reset rib plate 325, and the locking leg 32 is rotated to the inner cavity 321 when locked, thereby reducing the vertical height of the caster, lowering the center of gravity, further improving the stability, and reducing the volume.

[0034] Specifically, an anti-skid limit plate 328 is provided at the lower part of the locking leg 32, the outer diameter of the anti-skid limit plate 328 is larger than the inner diameter of the locking installation chamber 14, and the anti-skid limit plate 328 is limitedly matched with the housing 1. When unlocking, the locking leg 32 is limited by the anti-skid limit plate 328 to prevent the locking leg 32 from being completely retracted into the locking installation chamber 14, to prevent impurities from entering the gap between the locking leg 32 and the locking installation chamber 14, to prevent jamming, and to improve reliability and stability. The anti-skid limit plate 328 is made of rubber material, which can further improve friction and stability.

[0035] Specifically, the upper limit clamping portion 317 is a buckle protruding downward, and the cross-sectional shape of the buckle is semicircular. The lower limit clamping portion 323 is a downwardly concave slot, and the buckle and the slot are engaged when the locking leg 32 is in the locked position. The slot with a semicircular cross-section can be easily engaged and separated with the slot during the locking and unlocking process, avoiding the jamming phenomenon, and has a simple structure and low cost.

[0036] Specifically, the pulley assembly 2 includes a pulley support 22, a rotating connecting rod 23 and a wheel 21. The upper end of the rotating connecting rod 23 is rotatably mounted on the upper wall of the pulley installation chamber 13, and the lower end of the rotating connecting rod 23 is fixedly connected to the lower part of the pulley support 22. The lower part of the pulley support 22 is provided with a mounting groove 221, and the mounting groove 221 is transversely provided with a rotating shaft 222. The wheel 21 is rotatably mounted on the rotating shaft 222, and there is a rotation gap between the pulley assembly 2 and the inner side wall of the pulley installation chamber 13. The pulley support 22 can be rotated 360° by rotating the connecting rod 23, thereby realizing the function of universal movement, making the movement more convenient, and preventing friction between the wheel 21 and the inner side wall of the pulley installation chamber 13 by the rotating gap, thereby improving reliability.

[0037] Specifically, a rotating bearing 24 is provided on the rotating connecting rod 23, and a bearing embedding groove 17 is provided on the upper part of the pulley installation chamber 13, and the rotating bearing 24 is embedded in the bearing embedding groove 17. The rotating bearing 24 increases the smoothness of the rotation of the rotating connecting rod 23, further improving the convenience of movement.

[0038] Specifically, the housing 1 includes a first housing 11 and a second housing 12, which are buckled with each other, and the lower parts of the first housing 11 and the second housing 12 enclose a pulley installation chamber 13 and a locking installation chamber 14, and the upper parts of the first housing 11 and the second housing 12 enclose a connecting chamber 15, and an opening is provided at the upper part of the connecting chamber 15. The housing 1 is formed by buckling the first housing 11 and the second housing 12 with each other, which has a simple structure and low cost, and is convenient for installing the pulley assembly 2 and the locking assembly 3. The rods of the clothes drying rack are connected through the connecting chamber 15, so that the rods of the clothes drying rack can be inserted into the connecting chamber 15, thereby improving the connection strength.

[0039] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A caster with an improved locking mechanism, characterized in that: The invention comprises a housing (1) and a pulley assembly (2) and a locking assembly (3) installed in the housing (1); a pulley installation chamber (13) and a locking installation chamber (14) are provided in the housing (1); openings are provided at the lower parts of the pulley installation chamber (13) and the locking installation chamber (14); the pulley assembly (2) is arranged in the pulley installation chamber (13); the locking assembly (3) is arranged in the locking installation chamber (14); a wheel (21) is rotatably installed on the pulley assembly (2); the lower edge of the wheel (21) protrudes downward from the lower end surface of the housing (1); The locking assembly (3) comprises a locking switch (31), a locking leg (32) and an elastic reset member (33); the locking leg (32) is slidably mounted in the locking mounting chamber (14) up and down; one end of the locking switch (31) is set as a connecting end (312) and the other end is set as an operating end (316); the connecting end (312) is rotatably mounted in the locking mounting chamber (14); the operating end (316) extends to the outside of the housing (1); the locking switch (31) is located above the locking leg (32) and abuts against the locking leg (32); the elastic reset member (33) is set between the locking switch (31) and the locking leg (32) to realize driving the locking leg (32) to reset upwards; The locking switch (31) is provided with an upper limit clamping portion (317), the locking support leg (32) is provided with a lower limit clamping portion (323), the locking support leg (32) is provided with an unlocking position and a locking position, when the locking support leg (32) is in the unlocking position, the lower end surface of the locking support leg (32) is higher than the lower edge of the wheel (21) in vertical height, when the locking support leg (32) is in the locking position, the lower end surface of the locking support leg (32) is lower than the lower edge of the wheel (21) in vertical height, and the upper limit clamping portion (317) is buckled with the lower limit clamping portion (323).

2. A caster with an improved locking mechanism according to claim 1, characterized in that: The locking switch (31) comprises a connecting plate (311) and an operating plate (315); the connecting plate (311) and the operating plate (315) are integrally formed to form an "L"-shaped locking switch (31); the connecting end (312) is arranged on the connecting plate (311); the operating end (316) is arranged on the operating plate (315); the upper limit clamping portion (317) is arranged on the lower part of the operating plate (315); the lower limit clamping portion (323) is arranged on the upper part of the locking leg (32); when the locking leg (32) is in the locking position, the lower part of the operating plate (315) abuts against the upper part of the locking leg (32).

3. A caster with an improved locking mechanism according to claim 2, characterized in that: A reset avoidance groove (313) is provided in the middle of the connecting plate (311), and a connecting shaft (314) penetrating the reset avoidance groove (313) is provided at the connecting end (312), and the connecting shaft (314) is rotatably installed in the locking installation chamber (14), and the elastic reset member (33) adopts a tension spring, the upper end of the tension spring is connected to the middle of the connecting shaft (314), and the lower end of the tension spring is connected to the locking support foot (32).

4. A caster with an improved locking mechanism according to claim 3, characterized in that: An upper pressing arc surface (318) is provided at the connection between the connecting plate (311) and the operating plate (315), and a lower pressing arc surface (324) is provided at the upper part of the corresponding locking leg (32). The upper pressing arc surface (318) and the lower pressing arc surface (324) are pressed together, and the length of the connecting plate (311) is smaller than the length of the operating plate (315).

5. A caster with an improved locking mechanism according to claim 4, characterized in that: The locking leg (32) is provided with an inner cavity (321) with an opening facing upward, the inner cavity (321) is provided with two locking ribs (322) arranged at intervals, a reset rib (325) is arranged between the two locking ribs (322), the two locking ribs (322) are both provided with the lower pressing arc surface (324), the two locking ribs (322) and the reset rib (325) are respectively provided with the lower limit clamping part (323), the reset rib (325) is provided with a hanging hole (326) penetrating the reset rib (325), the upper end of the tension spring is hooked on the connecting shaft The lower end of the tension spring passes through the reset avoidance groove (313) and is hooked on the hanging hole (326) at the middle part of the shaft (314). A limiting slide groove (16) is provided on one side of the housing (1). The limiting slide groove (16) is connected to the locking installation chamber (14). A locking avoidance groove (327) is provided on the side of the locking leg (32) facing the limiting slide groove (16). The operating end (316) of the operating panel (315) passes through the locking avoidance groove (327) and the limiting slide groove (16) in sequence and extends out of the housing (1). The operating panel (315) is limitedly matched with the limiting slide groove (16).

6. The caster with improved locking mechanism according to claim 1, characterized in that: An anti-skid limit plate (328) is provided at the lower part of the locking support foot (32), the outer diameter of the anti-skid limit plate (328) is larger than the inner diameter of the locking installation chamber (14), and the anti-skid limit plate (328) is in position-limiting cooperation with the housing (1).

7. The caster with improved locking mechanism according to claim 1, characterized in that: The upper limit clamping portion (317) is a downwardly protruding clamping buckle, the cross-sectional shape of the clamping buckle is semicircular, the lower limit clamping portion (323) is a downwardly recessed clamping groove, and the clamping buckle and the clamping groove are engaged when the locking leg (32) is in the locking position.

8. A caster with an improved locking mechanism according to any one of claims 1 to 7, characterized in that: The pulley assembly (2) comprises a pulley support (22), a rotating connecting rod (23) and the wheel (21); the upper end of the rotating connecting rod (23) is rotatably mounted on the upper wall of the pulley mounting chamber (13); the lower end of the rotating connecting rod (23) is fixedly connected to the lower part of the pulley support (22); the lower part of the pulley support (22) is provided with a mounting groove (221); the mounting groove (221) is transversely provided with a rotating shaft (222); the wheel (21) is rotatably mounted on the rotating shaft (222); and a rotating gap is provided between the pulley assembly (2) and the inner side wall of the pulley mounting chamber (13).

9. A caster with an improved locking mechanism according to claim 8, characterized in that: A rotary bearing (24) is arranged on the rotary connecting rod (23), a bearing embedding groove (17) is arranged on the upper part of the pulley installation chamber (13), and the rotary bearing (24) is embedded in the bearing embedding groove (17).

10. The caster with improved locking mechanism according to claim 1, characterized in that: The housing (1) comprises a first shell (11) and a second shell (12), the first shell (11) and the second shell (12) being interlocked, the lower parts of the first shell (11) and the second shell (12) enclosing the pulley installation chamber (13) and the locking installation chamber (14), and the upper parts of the first shell (11) and the second shell (12) enclosing a connecting chamber (15), and the upper part of the connecting chamber (15) is provided with an opening.

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