Trundle locking device and medical bed

Abstract

The invention relates to the technical field of casters, and discloses a caster locking device and a medical bed, the caster locking device comprises at least one caster, a mounting frame, a supporting piece and a driving assembly, the at least one caster is mounted on the mounting frame, a through hole is formed in the mounting frame, the supporting piece is movably mounted in the through hole, one end of the driving assembly is hinged to the mounting frame, and the other end of the driving assembly is hinged to the supporting piece; the driving assembly is suitable for driving the supporting piece to move in the vertical direction, the locking end of the driving assembly has a locking state in which the bottom end of the supporting piece is driven to be lower than the bottom end of the trundle, and the unlocking end of the driving assembly has an unlocking state in which the bottom end of the supporting piece is driven to be higher than the bottom end of the trundle. When the driving assembly drives the supporting piece to be in the unlocking state, the trundles make contact with the ground, the trundles can be unlocked, and the trundle locking device has the advantages of being simple in structure, convenient and fast to operate and high in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of casters, and in particular to a caster locking device and a medical bed. Background Art

[0002] In medical scenarios, medical beds equipped with casters greatly improve the convenience of movement. Medical staff can easily push the medical bed and transfer patients to different areas. However, the existence of casters also brings severe challenges to the fixation of medical beds. Patients need a stable environment when resting, which prompted the emergence of lockable medical beds and their practical application.

[0003] In the prior art, a brake locking device is usually installed on the caster, but the existing brake locking device has a complex structure, high production cost, and is inconvenient to operate. Most of them only rely on rotational motion to drive the locking structure to lock the wheel, and the wheel locking reliability is poor. Summary of the invention

[0004] In view of this, the present invention provides a caster locking device and a medical bed to solve the problems in the prior art that the brake locking device of the caster is complex in structure, has a high production cost, is inconvenient to operate, and has poor wheel locking reliability.

[0005] In the first aspect, the present invention provides a caster locking device, including a caster, a mounting frame, a support member and a driving assembly, wherein at least one caster is mounted on the mounting frame, the mounting frame is provided with a through hole, the support member is movably mounted in the through hole, one end of the driving assembly is hinged to the mounting frame, and the other end is hinged to the support member, the driving assembly is suitable for driving the support member to move in a vertical direction, the locking end of the driving assembly has a locking state in which the bottom end of the driving support member is lower than the bottom end of the caster, and the unlocking end of the driving assembly has an unlocking state in which the bottom end of the driving support member is higher than the bottom end of the caster.

[0006] Beneficial effect: When the driving component drives the support member in a locked state, the caster is separated from the ground, thereby locking the caster and preventing the caster from displacement. When the driving component drives the support member in an unlocked state, the caster contacts the ground, thereby unlocking the caster. The present invention has the advantages of simple structure, convenient operation and high reliability.

[0007] In an optional embodiment, the driving assembly includes a first connecting member, a second connecting member, a locking member and an unlocking member, one end of the first connecting member is hinged to the mounting frame, one end of the second connecting member is hinged to an end of the first connecting member away from the mounting frame, and the other end is hinged to the support member, the first connecting member and the second connecting member are arranged at an angle in the unlocked state, and the angle between the first connecting member and the second connecting member in the locked state is 180 degrees, the locking member is connected to the second connecting member, the locking member is suitable for driving the second connecting member to rotate to the locked state, the unlocking member is movably installed on the mounting frame, and the unlocking member is suitable for driving the first connecting member and / or the second connecting member to rotate to the unlocked state.

[0008] Beneficial effect: When the locking member drives the second connecting member to move to an angle of 180 degrees with the first connecting member, the caster is separated from the ground, thereby locking the caster to prevent displacement of the caster. When the unlocking member drives the first connecting member and / or the second connecting member to rotate to an unlocked state at an angle, the caster contacts the ground, thereby unlocking the caster. Locking is achieved through a mechanical structure, which has the advantages of simple structure, convenient operation, high reliability and easy maintenance.

[0009] In an optional embodiment, the drive assembly further includes a third connecting member, the third connecting member movably connects the first connecting member and the second connecting member, the unlocking end is arranged on the unlocking member, and the unlocking end is suitable for movably abutting against the third connecting member.

[0010] Beneficial effect: When the present invention is in a locked state, the unlocking end is abutted against the third connecting member by driving the unlocking member, and the third connecting member is driven to move, thereby generating an angle between the first connecting member and the second connecting member, driving the supporting member to rise and move, thereby unlocking the caster, and has the advantages of simple structure and convenient operation.

[0011] In an optional embodiment, the caster locking device further includes a limiting member, and the limiting member is arranged on the top of the mounting frame or the bottom of the unlocking member.

[0012] Beneficial effect: The present invention sets a limiting member on the top of the mounting frame or the bottom of the unlocking member, and when the unlocking end on the unlocking member drives the third connecting member to generate displacement, the unlocking member can be limited.

[0013] In an optional embodiment, the locking member includes a connecting rod and a driving arm, the connecting rod is connected to an end of the second connecting member away from the first connecting member, and the driving arm is connected to an end of the connecting rod away from the second connecting member.

[0014] Beneficial effects: In the present invention, the user operates the driving arm to drive the connecting rod to swing, and the second connecting member connected to the connecting rod rotates accordingly, thereby locking the caster, which has the advantages of simple structure and convenient operation.

[0015] In an optional embodiment, a first mounting hole is provided on the mounting frame, a second mounting hole is provided on the unlocking member, and the first elastic member is installed in the first mounting hole and the second mounting hole.

[0016] Beneficial effect: The present invention arranges a first elastic member between the mounting frame and the unlocking member. When the user operates the unlocking member, the elastic force of the first elastic member can drive the unlocking member to return to its original position.

[0017] In an optional embodiment, the caster locking device further includes a second elastic member, a flange is provided on the top of the support member, and the second elastic member is arranged between the flange and the mounting frame.

[0018] Beneficial effect: When the present invention is in a locked state, the second elastic member is compressed, and when the operator operates the unlocking member to unlock, the support member is driven to move upward under the elastic force of the second elastic member.

[0019] In an optional embodiment, a friction member is provided at the bottom of the support member.

[0020] Beneficial effect: The friction member is arranged at the bottom of the support member in the present invention to increase the friction between the support member and the ground, thereby avoiding displacement between the support member and the ground in a locked state.

[0021] In an optional embodiment, the caster includes a bracket and a roller, the bracket is rotatably mounted on the bottom of the mounting frame, and the roller is rotatably mounted on the bracket.

[0022] In a second aspect, the present invention further provides a medical bed, comprising a bed body and at least two of the above-mentioned caster locking devices, wherein a mounting frame is mounted at the bottom of the bed body.

[0023] Beneficial effects: The present invention arranges a caster locking device on the bed body, and drives the support member to be in a locked state and an unlocked state through a driving component of a mechanical structure to achieve locking or unlocking of the bed body. It has the advantages of simple structure, convenient operation, high reliability and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a three-dimensional schematic diagram of a caster locking device according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0027] Figure 3 A three-dimensional schematic diagram of a caster locking device according to an embodiment of the present invention from another perspective;

[0028] Figure 4 It is a three-dimensional schematic diagram of a support member and a driving assembly in a caster locking device according to an embodiment of the present invention;

[0029] Figure 5 It is a three-dimensional schematic diagram of a mounting frame in a caster locking device according to an embodiment of the present invention;

[0030] Figure 6 It is a three-dimensional schematic diagram of a first connecting member and a second connecting member in a caster locking device according to an embodiment of the present invention;

[0031] Figure 7 It is a three-dimensional schematic diagram of an unlocking member in a caster locking device according to an embodiment of the present invention;

[0032] Figure 8 The figure is a three-dimensional schematic diagram of a medical bed according to an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. caster; 101. bracket; 102. roller;

[0035] 2. Mounting frame; 201. First mounting hole; 202. Through hole;

[0036] 3. Support member; 301. Flange; 302. Friction member;

[0037] 4. Driving assembly; 401. first connecting member; 4011. first limiting portion; 402. second connecting member; 4021. second limiting portion; 403. locking member; 4031. connecting rod; 4032. driving arm; 404. unlocking member; 4041. second mounting hole; 4042. unlocking end; 405. third connecting member;

[0038] 5. Limiting parts;

[0039] 6. a first elastic member;

[0040] 7. A second elastic member;

[0041] 100. Caster locking device;

[0042] 200. Bed. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0044] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0045] According to an embodiment of the present invention, on the one hand, Figures 1 to 7 As shown, a caster locking device 100 is provided, comprising a caster 1, a mounting frame 2, a support member 3 and a driving assembly 4, at least one caster 1 is mounted on the mounting frame 2, a through hole 202 is provided on the mounting frame 2, the support member 3 is movably mounted in the through hole 202, one end of the driving assembly 4 is hinged to the mounting frame 2, and the other end is hinged to the support member 3, the driving assembly 4 is suitable for driving the support member 3 to move in a vertical direction, the locking end of the driving assembly 4 has a locking state in which the bottom end of the driving support member 3 is lower than the bottom end of the caster 1, and the unlocking end 4042 of the driving assembly 4 has an unlocking state in which the bottom end of the driving support member 3 is higher than the bottom end of the caster 1.

[0046] Specifically, Figure 5 As shown, in this embodiment, the mounting frame 2 is not specifically limited. For example, in this embodiment, the mounting frame 2 adopts a rectangular groove structure, and its cross section is in the shape of a "door", with the groove facing downward.

[0047] In this embodiment, the number of casters 1 is not specifically limited. For example, in this embodiment, two casters 1 are installed at the bottom of the mounting frame 2, and a through hole 202 is provided at the top of the mounting frame 2. The through hole 202 is located between the two casters 1.

[0048] In this embodiment, the support member 3 is not specifically limited. For example, in this embodiment, the support member 3 adopts a cylindrical structure, the diameter of the support member 3 matches the through hole 202, and the support member 3 is vertically movably arranged in the through hole 202.

[0049] In this embodiment, one end of the driving component 4 is hinged to the side of the mounting frame 2, and the other end is hinged to the part of the support member 3 located below the mounting frame 2. The driving component 4 is provided with a locking end and an unlocking end 4042. The locking end is used to drive the support member 3 to move downward and move the mounting frame 2 and the caster 1 upward, thereby achieving a locked state in which the bottom end of the support member 3 is lower than the bottom end of the caster 1; the unlocking end 4042 has the function of driving the mounting frame 2 and the caster 1 to move downward and move the support member 3 upward, thereby achieving an unlocked state in which the bottom end of the support member 3 is higher than the bottom end of the caster 1.

[0050] When the driving component 4 drives the support member 3 to be in a locked state, the caster 1 is separated from the ground, thereby locking the caster 1 and preventing the caster 1 from displacement. When the driving component 4 drives the support member 3 to be in an unlocked state, the caster 1 contacts the ground, thereby unlocking the caster 1. The present invention has the advantages of simple structure, convenient operation and high reliability.

[0051] In one embodiment, Figures 1 to 4 and Figure 6 As shown, the driving assembly 4 includes a first connecting member 401, a second connecting member 402, a locking member 403 and an unlocking member 404. One end of the first connecting member 401 is hinged to the mounting frame 2, one end of the second connecting member 402 is hinged to an end of the first connecting member 401 away from the mounting frame 2, and the other end is hinged to the support member 3. The first connecting member 401 and the second connecting member 402 are arranged at an angle in the unlocked state, and the angle between the first connecting member 401 and the second connecting member 402 in the locked state is 180 degrees. The locking member 403 is connected to the second connecting member 402, and the locking member 403 is suitable for driving the second connecting member 402 to rotate to the locked state. The unlocking member 404 is movably installed on the mounting frame 2, and the unlocking member 404 is suitable for driving the first connecting member 401 and / or the second connecting member 402 to rotate to the unlocked state.

[0052] Specifically, Figure 4 and Figure 6As shown, in this embodiment, the first connecting member 401 and the second connecting member 402 both adopt a groove-shaped structure, and their cross-sections are both in the shape of a "door". The cross-sectional size of the first connecting member 401 is smaller than the cross-sectional size of the mounting seat, and the two sides of one end of the first connecting member 401 are hinged to the two sides of the mounting seat, and the part where the first connecting member 401 is hinged to the mounting seat is in a convex arc shape, and the cross-sectional size of the second connecting member 402 is smaller than the cross-sectional size of the first connecting member 401, and the two sides of one end of the second connecting member 402 are hinged to the two sides of the end of the first connecting member 401 away from the mounting seat, and the two sides where the second connecting member 402 is hinged to the first connecting member 401 are in a convex arc shape, and the other end of the second connecting member 402 is hinged to the part of the support member 3 located below the mounting seat, and the locking member 403 is fixedly connected to the hinged portion of the second connecting member 402 and the support member 3. When unlocked, the first connecting member 401 and the second connecting member 402 are hinged to the support member 3. There is an angle between the two connecting members 402. When the locking member 403 is driven downward, the second connecting member 402 moves downward with the locking member 403 and drives the first connecting member 401 to rotate. The support member 3 also moves downward with the second connecting member 402. At this time, the angle between the first connecting member 401 and the second connecting member 402 gradually increases. When the bottom of the support member 3 contacts the ground, the locking member 403 continues to apply downward force, the second connecting member 402 continues to rotate, and the first connecting member 401 and the mounting frame 2 move upward until the first limiting portion 4011 on the first connecting member 401 abuts the second limiting portion 4021 on the second connecting member 402. The angle is 180 degrees, and the first connecting member 401 and the second connecting member 402 are in a locked state. At this time, the caster 1 leaves the ground, and the caster 1 is locked to prevent the caster 1 from displacement. Correspondingly, when the unlocking member 404 drives the first connecting member 401 and the second connecting member 402 to rotate, the angle between the first connecting member 401 and the second connecting member 402 is restored to be less than 180 degrees, and the mounting frame 2 moves downward with the first connecting member 401 until the caster 1 contacts the ground, and the first connecting member 401 continues to rotate, causing the second connecting member 402 to rotate, causing the support member 3 to move upward and be in an unlocked state, at which time the caster 1 can move on the ground.

[0053] When the locking member 403 drives the second connecting member 402 to move to an angle of 180 degrees with the first connecting member 401, the caster 1 is separated from the ground, and the caster 1 can be locked to prevent the caster 1 from displacement. When the unlocking member 404 drives the first connecting member 401 and / or the second connecting member 402 to rotate to an unlocked state with an angle, the caster 1 contacts the ground, and the caster 1 is unlocked. Locking is achieved through a mechanical structure, which has the advantages of simple structure, convenient operation, high reliability and easy maintenance.

[0054] In one embodiment, Figure 2 and Figure 4As shown, the driving assembly 4 further includes a third connecting member 405 , which movably connects the first connecting member 401 and the second connecting member 402 , and an unlocking end 4042 is disposed on the unlocking member 404 , and the unlocking end 4042 is suitable for movably abutting against the third connecting member 405 .

[0055] Specifically, in this embodiment, the first connecting member 401 and the second connecting member 402 are hinged by a third connecting member 405. In this embodiment, a third connecting member 405 is provided at each connection point on both sides of the first connecting member 401 and the second connecting member 402, and the end of the third connecting member 405 away from the support member 3 extends outward to form a protrusion.

[0056] In this embodiment, Figures 1 to 3 and Figure 7 As shown, the unlocking member 404 is hingedly connected to the mounting frame 2, and the side of the unlocking member 404 is hingedly connected to the side of the mounting frame 2 and the side of the first connecting member 401 by the same hinge. A hinge is provided on each side of the unlocking member 404, and the unlocking end 4042 of the unlocking member 404 extends downward, and the extension length is not less than the position of the protrusion when it is in the locked state. In the locked state, the user applies a downward force to the top of the unlocking member 404 to rotate the unlocking member 404, and the unlocking end 4042 also rotates accordingly and abuts against the protrusion, continuing to apply downward force to the unlocking member 404. The unlocking end 4042 uses the hinge of the unlocking member 404 as a fulcrum, and through the lever action, pushes the protrusion in the direction away from the support member 3, so that the angle between the first connecting member 401 and the second connecting member 402 is less than 180 degrees. As the second connecting member 402 rotates, the support member 3 is driven to move upward, thereby achieving unlocking of the caster 1.

[0057] In the locked state, the present invention drives the unlocking member 404 to make the unlocking end 4042 abut against the third connecting member 405, and drives the third connecting member 405 to move, thereby realizing an angle between the first connecting member 401 and the second connecting member 402, driving the support member 3 to rise and move, thereby unlocking the caster 1, and has the advantages of simple structure and convenient operation.

[0058] In one embodiment, Figures 1 to 3 As shown, the caster locking device 100 further includes a limiting member 5 , which is disposed on the top of the mounting frame 2 or the bottom of the unlocking member 404 .

[0059] Specifically, in this embodiment, the limiting member 5 is arranged on the top of the mounting frame 2 and is located below the unlocking member 404 .

[0060] In the present invention, a limiting member 5 is disposed on the top of the mounting frame 2 or the bottom of the unlocking member 404 , and when the unlocking end 4042 on the unlocking member 404 drives the third connecting member 405 to generate displacement, the unlocking member 404 can be limited.

[0061] In one embodiment, Figures 1 to 4 As shown, the locking member 403 includes a connecting rod 4031 and a driving arm 4032 . The connecting rod 4031 is connected to one end of the second connecting member 402 away from the first connecting member 401 , and the driving arm 4032 is connected to one end of the connecting rod 4031 away from the second connecting member 402 .

[0062] Specifically, in this embodiment, the connecting rod 4031 is connected to the hinged part where the second connecting member 402 and the support member 3 are hinged, the connecting rod 4031 is horizontally arranged, the driving arm 4032 is connected to the end of the connecting rod 4031 away from the second connecting member 402, and the driving arm 4032 is arranged in an inclined upward manner. When the user needs to lock the caster 1, by applying a downward force to the driving arm 4032, the driving arm 4032 moves downward while driving the connecting rod 4031 to rotate, and drives the second connecting member 402 to move downward and rotate. At this time, the support member 3 moves downward until it contacts the ground, and continues to apply a downward force to the driving arm 4032, so that the second connecting member 402 continues to rotate, and drives the first connecting member 401 to rotate, so that the mounting frame 2 moves upward, until the angle between the first connecting member 401 and the second connecting member 402 is 180 degrees, and the bottom of the caster 1 leaves the ground, thereby achieving the locking of the caster 1.

[0063] In the present invention, the user operates the driving arm 4032 to drive the connecting rod 4031 to swing, and the second connecting member 402 connected to the connecting rod 4031 rotates accordingly, thereby locking the caster 1, which has the advantages of simple structure and convenient operation.

[0064] In one embodiment, Figure 2 , Figure 5 and Figure 7 As shown, the mounting frame 2 is provided with a first mounting hole 201 , the unlocking member 404 is provided with a second mounting hole 4041 , and the first elastic member 6 is installed in the first mounting hole 201 and the second mounting hole 4041 .

[0065] Specifically, in this embodiment, a first mounting hole 201 is provided on the side of the mounting frame 2, a second mounting hole 4041 is provided on the side of the unlocking member 404, and the first elastic member 6 is installed in the first mounting hole 201 and the second mounting hole 4041. In this embodiment, the first elastic member 6 is not specifically limited. For example, in this embodiment, the first elastic member 6 adopts a torsion spring.

[0066] In the present invention, a first elastic member 6 is disposed between the mounting frame 2 and the unlocking member 404 . When the user operates the unlocking member 404 , the elastic force of the first elastic member 6 can drive the unlocking member 404 to return to its original position.

[0067] In one embodiment, Figures 1 to 3As shown, the caster locking device 100 further includes a second elastic member 7 , a flange 301 is provided on the top of the support member 3 , and the second elastic member 7 is arranged between the flange 301 and the mounting frame 2 .

[0068] Specifically, in this embodiment, the support member 3 is located below the through hole 202, and a limit hole is provided above the hinge with the second connecting member 402, a limit pin is installed in the limit hole, the sleeve is sleeved on the outer wall of the support member 3, and the sleeve is located above the limit pin, the outer wall of the sleeve is passed through the through hole 202, one end of the second elastic member 7 abuts against the bottom of the flange 301, and the other end abuts against the top of the sleeve.

[0069] When the present invention is in a locked state, the second elastic member 7 is compressed. When the operator operates the unlocking member 404 to unlock, the support member 3 is driven to move upward under the elastic force of the second elastic member 7 .

[0070] In one embodiment, Figure 3 As shown, a friction member 302 is provided at the bottom of the support member 3 .

[0071] Specifically, in this embodiment, the friction member 302 is not specifically limited. For example, the friction member 302 may be a rubber sleeve.

[0072] In the present invention, the friction member 302 is arranged at the bottom of the support member 3 to increase the friction between the support member 3 and the ground, thereby preventing the support member 3 from being displaced from the ground in the locked state.

[0073] In one embodiment, Figure 3 As shown, the caster 1 includes a bracket 101 and a roller 102 . The bracket 101 is rotatably mounted on the bottom of the mounting frame 2 , and the roller 102 is rotatably mounted on the bracket 101 .

[0074] According to an embodiment of the present invention, on the other hand, Figure 8 As shown, a medical bed is also provided, comprising a bed body 200 and at least two of the above-mentioned caster locking devices 100 , and a mounting frame 2 is mounted at the bottom of the bed body 200 .

[0075] Specifically, in this embodiment, two caster locking devices 100 are provided on one side of the bottom of the bed body 200, and the two caster locking devices 100 are connected together by a locking member 403. The locking member 403 is in the shape of a "J". The two ends of the locking member 403 are connecting rods 4031, and the middle part is a driving arm 4032. Two ordinary casters 1 are provided on the other side of the bottom of the bed body 200.

[0076] In this embodiment, when the medical bed needs to be locked, the user can lock the caster 1 in the caster locking device 100 by stepping down the locking member 403, and can unlock the caster 1 in the caster locking device 100 by stepping on the unlocking member 404 again, thereby realizing the movement of the medical bed.

[0077] The present invention sets a caster locking device 100 on the bed body 200, and drives the support member 3 to be in a locked state and an unlocked state through the driving component 4 of the mechanical structure to achieve locking or unlocking of the bed body 200, which has the advantages of simple structure, convenient operation, high reliability and easy maintenance.

[0078] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A caster locking device, characterized in that: include: Castor (1); A mounting frame (2), at least one of the casters (1) being mounted on the mounting frame (2), and a through hole (202) being provided on the mounting frame (2); A support member (3), the support member (3) being movably mounted in the through hole (202); A driving component (4), one end of the driving component (4) is hinged to the mounting frame (2), and the other end is hinged to the support member (3), the driving component (4) is suitable for driving the support member (3) to move in a vertical direction, the locking end of the driving component (4) has a locking state in which the bottom end of the support member (3) is driven to be lower than the bottom end of the caster (1), and the unlocking end (4042) of the driving component (4) has an unlocking state in which the bottom end of the support member (3) is driven to be higher than the bottom end of the caster (1).

2. The caster locking device according to claim 1, characterized in that: The driving assembly (4) comprises: A first connecting member (401), one end of the first connecting member (401) being hinged to the mounting frame (2); a second connecting member (402), one end of the second connecting member (402) being hinged to one end of the first connecting member (401) away from the mounting frame (2), and the other end of the second connecting member (402) being hinged to the supporting member (3), the first connecting member (401) and the second connecting member (402) being arranged at an angle when in an unlocked state, and the angle between the first connecting member (401) and the second connecting member (402) being 180 degrees when in a locked state; A locking member (403), wherein the locking member (403) is connected to the second connecting member (402), and the locking member (403) is suitable for driving the second connecting member (402) to rotate to the locking state; An unlocking member (404), the unlocking member (404) is movably mounted on the mounting frame (2), and the unlocking member (404) is suitable for driving the first connecting member (401) and / or the second connecting member (402) to rotate to the unlocking state.

3. The caster locking device according to claim 2, characterized in that: The driving assembly (4) further comprises: A third connecting member (405), wherein the third connecting member (405) movably connects the first connecting member (401) and the second connecting member (402), and the unlocking end (4042) is arranged on the unlocking member (404), and the unlocking end (4042) is suitable for movably abutting against the third connecting member (405).

4. The caster locking device according to claim 2 or 3, characterized in that: Also includes: A limiting member (5), wherein the limiting member (5) is arranged at the top of the mounting frame (2) or at the bottom of the unlocking member (404).

5. The caster locking device according to claim 2 or 3, characterized in that: The locking member (403) comprises: A connecting rod (4031), the connecting rod (4031) being connected to an end of the second connecting member (402) away from the first connecting member (401); A driving arm (4032), wherein the driving arm (4032) is connected to an end of the connecting rod (4031) away from the second connecting member (402).

6. The caster locking device according to claim 2 or 3, characterized in that: The mounting frame (2) is provided with a first mounting hole (201), the unlocking member (404) is provided with a second mounting hole (4041), and the first elastic member (6) is installed in the first mounting hole (201) and the second mounting hole (4041).

7. The caster locking device according to claim 1, characterized in that: Also includes: A second elastic member (7), a flange (301) is provided on the top of the support member (3), and the second elastic member (7) is arranged between the flange (301) and the mounting frame (2).

8. The caster locking device according to claim 1, characterized in that: A friction member (302) is provided at the bottom of the support member (3).

9. The caster locking device according to claim 1, characterized in that: The caster (1) comprises: A bracket (101), the bracket (101) being rotatably mounted on the bottom of the mounting frame (2); A roller (102), wherein the roller (102) is rotatably mounted on the bracket (101).

10. A medical bed, characterized in that: include: Bed (200); At least two of the caster locking devices (100) described in any one of claims 1 to 9, wherein the mounting frame (2) is mounted on the bottom of the bed (200).

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