Headstock adjusting device

Abstract

The invention relates to the technical field of surgical devices, and provides a headstock adjusting device. The headstock adjusting device comprises: a base; a control mechanism used for installing a headstock comprises a main body part, a transmission assembly, an unlocking rod in sliding connection with the main body part in the first direction and two driving rods in sliding connection with the main body part in the second direction intersecting with the first direction, the two driving rods are arranged on the two sides of the unlocking rod in the second direction respectively, and the transmission assembly is rotationally connected with the unlocking rod. The transmission shaft is in transmission fit with the two driving rods; the rotating arm group is connected between the base and the main body part, a locking structure capable of locking the rotating arm group to move is arranged in the rotating arm group, and the unlocking rod is in transmission connection with the locking structure; the two unlocking handles are arranged on the two sides of the main body part respectively and are in transmission connection with the two driving rods respectively; the two unlocking handles drive the two driving rods to get close to or away from each other, so that the two sides of the transmission assembly are stressed to drive the unlocking rods to get away from or get close to the main body part in the first direction, and the locking structure is correspondingly unlocked or locked.

Description

Technical Field

[0001] This application relates to the field of surgical device technology, and more particularly to a headrest adjustment device. Background Technology

[0002] In spinal surgery, the head frame is a crucial device for stabilizing the patient's head, and its stability directly affects the precision and safety of the surgery. To accommodate the positioning requirements of different surgical stages, the head frame is typically adjusted using a dual-joint adjustment mechanism. This mechanism relies on locking mechanisms located at the joints to switch between active and fixed states, and can be triggered to unlock with a single operation (such as pressing or pulling).

[0003] However, the locking structure of existing adjustment devices lacks interlocking protection. Accidental unlocking can easily occur when medical staff come into contact with the device, when the equipment vibrates unexpectedly, or when surrounding instruments collide with the locking mechanism, causing the headrest to lose its fixation and posing a medical safety risk. Furthermore, during the unlocking process, the sudden release of the headrest's support force can easily cause the patient's head to shake, often requiring assistance from others to stabilize it. This not only makes the operation inconvenient but also increases the complexity of surgical coordination. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a head frame adjustment device.

[0005] This application provides a headrest adjustment device, including: Base; The control mechanism for installing the head frame includes a main body, a transmission assembly, an unlocking rod slidably connected to the main body along a first direction, and two drive rods slidably connected to the main body along a second direction intersecting the first direction. The two drive rods are respectively disposed on both sides of the unlocking rod along the second direction. The transmission assembly is rotatably connected to the unlocking rod and is in transmission cooperation with the two drive rods. A rotating arm assembly is connected between the base and the main body, and has an internal locking structure that can lock the rotating arm assembly to prevent its movement. The unlocking rod is connected to the locking structure in a transmission manner. Two unlocking handles are located on both sides of the main body and are respectively connected to the two drive rods. The two unlocking handles drive the two drive rods to move closer or further apart, causing forces to be applied to both sides of the transmission assembly to move the unlocking rods away from or closer to the main body in the first direction, thereby unlocking or locking the locking structure accordingly.

[0006] Optionally, a first channel extending along the first direction and a second channel extending along the second direction are formed within the main body; One end of the first channel forms an opening on the surface of the main body, and the other end communicates with the second channel, which penetrates the main body along a second direction. The two drive rods are slidably disposed in the second channel and respectively arranged on both sides of the first channel along the second direction. The unlocking rod is slidably connected in the first channel. The transmission assembly is disposed in the main body.

[0007] Optionally, the transmission assembly includes a balance bar and two transmission links, the balance bar extending along the second direction and rotatably connected to the unlocking rod at its center; The two transmission links are respectively rotatably connected to the two ends of the balance bar, and the two transmission links are rotatably connected to the two drive rods respectively; The transmission link converts the force of the drive rod along the second direction into a force along the first direction, so that when the two drive rods move closer or further away from each other, they jointly drive the unlocking rod to slide away from or closer to the main body.

[0008] Optionally, the unlocking handle includes a handle body, a pressing part, and a telescopic rod. The pressing part is rotatably connected to the handle body, and the telescopic rod is slidably connected to the handle body. One end of the telescopic rod is drive-connected to the drive rod, and the other end is rotatably connected to the pressing part. When the pressing part rotates relative to the main body, it causes the telescopic rod to slide, thereby driving the drive rod to move along the second direction.

[0009] Optionally, the unlocking handle further includes a transmission arm along a third direction, the transmission arm being connected to one side of the main body along a second direction and being throttledly connected to the drive rod; The handle body is connected to the end of the transmission arm away from the main body, and the telescopic rod is connected to the transmission arm to drive the drive rod to slide along the second direction; the third direction is perpendicular to the plane containing the first direction and the second direction.

[0010] Optionally, the transmission arm includes a main arm body, a transmission rod, and two swinging components; The main arm has two ends, namely a first end and a second end, and two swing members are rotatably connected to the first end and the second end, respectively. The transmission rod is slidably connected to the main arm and disposed between the two swing members. The two ends of the transmission rod are rotatably connected to the two swing members, so that when one swing member rotates, the other swing member is driven to rotate synchronously through the transmission rod. The first end is connected to the main body, and the swing member at the first end is rotatably connected to the drive rod. The second end is connected to the handle body, and the swing member at the second end is rotatably connected to the telescopic rod.

[0011] Optionally, the rotating arm assembly is connected to one side of the main body along the first direction, and the handle body extends along the first direction toward the rotating arm assembly.

[0012] Optionally, it also includes a head frame fastener, wherein the main body is provided with a mounting groove, and a part of the head frame fastener is snapped into the mounting groove so that the head frame fastener is detachably connected to the main body.

[0013] Optionally, the rotating arm assembly includes a cylindrical component and a steering component; the locking structure includes two locking components; The two locking members are respectively installed at both ends of the cylindrical member; The locking member includes a rotating structure and a locking part disposed inside the rotating structure. The rotating structure has a rotation axis extending along the second direction. When the locking part is in a locked state, the rotation of the rotating structure is restricted. One end of the rotating structure of the locking member near the main body is fixedly connected to the cylindrical member, and the other end is fixedly connected to the steering member; One end of the rotating structure of the locking member away from the main body is fixedly connected to the cylindrical member, and the other end is fixedly connected to the base; The locking parts of the two locking members are connected in a driving manner so that the two locking parts lock and unlock synchronously; When both locking parts are unlocked, the cylindrical component rotates relative to the base and the steering component via the two rotating structures respectively; The end of the steering component away from the cylindrical component is bent toward the main body and fixedly connected to the main body; a rotating component is rotatably connected to the steering component, and the locking part of the locking component near the main body is connected to the unlocking rod through the rotating component.

[0014] Optionally, the rotating structure includes a first joint and a second joint, and the locking part includes a first locking member, a second locking member, an elastic member, and a movable shaft; The first joint and the second joint are rotatably connected and both are sleeved on the movable shaft. The first snap-fit ​​member is fixed to the side of the first joint facing the second joint, and the second snap-fit ​​member is movably disposed between the first joint and the second joint and is fixedly connected to the movable shaft. The movable shaft is connected to the second snap-fit ​​member and is limited by the second joint to restrict the rotation of the second joint relative to the movable shaft; The elastic element is connected between the second snap-fit ​​member and the second joint to drive the second snap-fit ​​member to snap and lock with the first snap-fit ​​member; One end of the movable shaft is the unlocking end, and the other end is the transmission end. When the unlocking end is subjected to force, it drives the second latching member to overcome the elastic force of the elastic member and separate from the first latching member, thereby unlocking the locking member. The unlocking end of one of the locking members is connected to the rotating member, and the transmission end is tractively connected to the unlocking end of the other locking member, so that when the unlocking rod pushes one of the movable shafts to move, the other movable shaft moves synchronously.

[0015] The technical solution provided in this application has the following advantages compared with the prior art: The headrest adjustment device provided in this application allows medical staff to hold two unlocking handles with both hands, driving two drive rods closer or further apart to unlock the locking structure and adjust the headrest position by rotating the arm assembly. When only one drive rod applies force to the transmission component, the transmission component rotates relative to the unlocking rod without moving the unlocking rod, preventing the locking structure from unlocking. This avoids accidental unlocking caused by accidental contact, equipment vibration, or foreign object collision, improving the safety and reliability of the surgical procedure. Furthermore, the design of using both hands to operate the two unlocking handles allows medical staff to stably control the position of the control mechanism during unlocking, effectively supporting the headrest, preventing patient head movement, reducing the number of personnel required to adjust the headrest position, and simplifying the unlocking and position adjustment process. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the headframe adjustment device described in the embodiments of this application; Figure 2 This is an exploded view of the headframe adjustment device described in the embodiments of this application; Figure 3 This is a schematic diagram of the control mechanism described in the embodiments of this application; Figure 4 This is a schematic diagram of the transmission assembly described in an embodiment of this application; Figure 5 This is a schematic diagram of the unlocking handle described in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a transmission arm according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of another transmission arm described in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the cylindrical component described in the embodiments of this application; Figure 9 This is a schematic diagram of the steering component described in an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the base described in the embodiments of this application; Figure 11 This is a structural schematic diagram of the head frame fixing component described in an embodiment of this application.

[0019] The components include: 1. Base; 2. Control mechanism; 21. Main body; 211. Mounting slot; 22. Transmission assembly; 221. Balance bar; 222. Transmission link; 23. Unlocking rod; 24. Drive rod; 3. Rotating arm assembly; 31. Cylinder body; 32. Steering component; 321. Rotating component; 33. Locking component; 4. Unlocking handle; 41. Handle body; 42. Pressing part; 43. Telescopic rod; 44. Transmission arm; 441. Main arm body; 442. Swinging component; 5. Head frame fixing component. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0022] The head frame has multiple anchor points. After the patient's head is placed inside the head frame, these anchor points abut against the patient's head, securing the head frame to the operating table or other fixed structural components, thus stabilizing the patient's head. To meet the positioning requirements of different surgical stages, the head frame is usually mounted on an adjustment device, allowing the device to adjust the position of the head frame.

[0023] Headrest adjustment devices typically have two rotatable joints with locking mechanisms such as latches or buckles. The movement of the headrest adjustment device is controlled by unlocking and locking these mechanisms. However, the locking mechanisms lack protection; accidental contact by medical staff, unexpected vibration of the equipment, or collisions with surrounding instruments can easily cause the adjustment device to unlock, resulting in the headrest losing its fixation and potentially causing a medical accident. Furthermore, after the adjustment mechanism is unlocked, the headrest suddenly loses its support, requiring assistance from medical personnel other than those performing the unlocking operation to stabilize the headrest, making the adjustment process cumbersome and inconvenient.

[0024] To solve the above problems, refer to Figures 1 to 11 As shown, this application embodiment provides a headrest adjustment device, including: a base 1; a control mechanism 2 for mounting the headrest, including a main body 21, a transmission assembly 22, an unlocking rod 23 slidably connected to the main body 21 along a first direction, and two drive rods 24 slidably connected to the main body 21 along a second direction intersecting the first direction, the two drive rods 24 being respectively disposed on both sides of the unlocking rod 23 along the second direction, the transmission assembly 22 being rotatably connected to the unlocking rod 23 and being in transmission cooperation with the two drive rods 24; a rotating arm assembly 3, connected between the base 1 and the main body 21, having an internal locking structure capable of locking the movement of the rotating arm assembly 3, the unlocking rod 23 being in transmission connection with the locking structure; and two unlocking handles 4, respectively disposed on both sides of the main body 21 and being in transmission connection with the two drive rods 24; the two unlocking handles 4 drive the two drive rods 24 to move closer or further away from each other, causing the transmission assembly 22 to be subjected to force on both sides to drive the unlocking rod 23 to move away from or closer to the main body 21 along the first direction, thereby unlocking or locking the locking structure accordingly.

[0025] Medical staff hold both unlocking handles 4 and move the two drive rods 24 closer or further apart to unlock the locking structure and adjust the position of the headrest by rotating the arm assembly 3. When only one drive rod 24 applies force to the transmission assembly 22, the transmission assembly 22 will rotate relative to the unlocking rod 23 without moving the unlocking rod 23, thus preventing the locking structure from unlocking. This avoids accidental unlocking caused by accidental contact, equipment vibration, or collision with foreign objects, improving the safety and reliability of the surgical procedure. In addition, the design of using both hands to operate the two unlocking handles 4 allows medical staff to stably control the position of the control mechanism 2 during unlocking, effectively supporting the headrest, preventing the patient's head from shaking, reducing the number of people required to adjust the headrest position, and simplifying the unlocking and position adjustment process.

[0026] The base 1 provides the mounting foundation for the entire device. It is made of high-strength aluminum alloy and has a rectangular block structure. The bottom is provided with bolt holes for fixing to the operating table, ensuring the overall stability of the device. The base 1 can be configured to include a bottom plate and a vertical plate. The vertical plate is set vertically on the bottom plate and is connected to the operating table or a track structure installed on the operating table. The bottom plate is fixedly connected to the rotating arm assembly 3, thereby enabling the rotating arm assembly 3 and the control mechanism 2 to be stably installed on the operating table.

[0027] Control mechanism 2 is the core of adjustment and locking control; the main body 21 can adopt a block structure. (Refer to...) Figure 1 and Figure 3 As shown, the first direction a can be the width direction of the main body 21, the second direction b is the length direction of the main body 21, and the third direction c is the height direction of the main body 21, that is, the first direction a, the second direction b and the third direction c are perpendicular to each other; of course, the angle between the first direction and the second direction can also be 30° or 60°, or the angle between the first direction and the second direction can be between 30° and 90°.

[0028] The main body 21 may be provided with a first guide rail extending in a first direction and a second guide rail extending in a second direction. The first guide rail is located in the middle of the second guide rail. The unlocking rod 23 is slidably connected to the first guide rail, and the driving rod 24 is slidably connected to the second guide rail. The transmission assembly 22 is disposed in the space between the unlocking rod 23 and the two driving rods 24.

[0029] Reference Figure 2 and Figure 3 As shown, in some embodiments, a first channel extending in a first direction and a second channel extending in a second direction are formed in the main body 21; One end of the first channel forms an opening on the surface of the main body 21, and the other end is connected to the second channel. The second channel penetrates the main body 21 along the second direction. Two drive rods 24 are slidably disposed in the second channel and are respectively arranged on both sides of the first channel along the second direction. The unlocking rod 23 is slidably connected in the first channel. The transmission assembly 22 is disposed in the main body 21.

[0030] This configuration, by providing a first and second interconnected channel within the main body 21, offers precise guidance and installation space for the unlocking lever 23 and the drive lever 24, effectively limiting the movement direction of each component and preventing offset or interference during movement. The drive lever 24, unlocking lever 23, and transmission assembly 22 are located inside the main body 21, preventing them from being impacted by external collisions or contact with foreign objects, thus protecting them from external impacts and foreign objects. Specifically, a first channel and a second channel can be drilled inside the main body 21, or alternatively, the first channel and the second channel can be formed internally during the manufacturing process of the main body 21. The first channel and the second channel form a T-shaped channel structure, and the transmission assembly 22 is disposed at the connection between the first channel and the second channel to connect with the unlocking rod 23 and the two drive rods 24 respectively.

[0031] One end of the first channel is connected to the second channel, and the other end forms a first opening on the side of the main body 21 along the first direction. The unlocking rod 23 is slidably connected in the first channel and extends out of the first channel through the first opening and is located on the outside of the main body 21, so as to facilitate the transmission connection between the unlocking rod 23 and the locking structure of the rotating arm assembly 3.

[0032] The second channel extends through the main body 21 in the second direction, so that the second channel forms a second opening on both sides of the main body 21 in the second direction. The ends of the two drive rods 24 that are far apart from each other can extend out of the second channel through the second opening and be located on the outside of the main body 21, so as to facilitate the transmission connection between the drive rods 24 and the unlocking handle 4.

[0033] The diameters of the first channel and the second channel correspond to and match the unlocking rod 23 and the driving rod 24, respectively, so that there is a gap between the unlocking rod 23 and the inner wall of the first channel, allowing the unlocking rod 23 to slide in the first channel along the first direction; and there is a gap between the driving rod 24 and the inner wall of the second channel, allowing the driving rod 24 to slide in the second channel along the second direction.

[0034] The main body 21 can be optionally mounted with a headstock via bolts, so that the headstock can be moved when the main body 21 moves. In some embodiments, refer to... Figure 1 , Figure 2 and Figure 11 As shown, the headrest adjustment device also includes a headrest fixing member 5. The main body 21 is provided with a mounting groove 211. A part of the headrest fixing member 5 is snapped into the mounting groove 211 so that the headrest fixing member 5 can be detachably connected to the main body 21.

[0035] With this configuration, the head frame fixing component 5 is engaged with the main body 21 via the mounting slot 211, allowing the head frame to be quickly disassembled and easily replaced.

[0036] Specifically, the head frame fixing component 5 is made of stainless steel and includes a connecting part and a clamping part. The connecting part is a rectangular block structure, and the clamping part is a U-shaped structure. It is fixedly connected to the connecting part by bolts. The inner side of the clamping part is provided with a rubber anti-slip pad for clamping the head frame column. The connecting part is used to insert into the mounting groove 211 to engage with the mounting groove 211.

[0037] Alternatively, the headstock fixing component 5 includes a base, a ball head, a ball head handle, and a connector. The ball head is rotatably connected to the base, the ball head handle is rotatably connected to the ball head, and the ball head handle is threadedly connected to the base. The position of the ball head can be adjusted by rotating the ball head handle. When the ball head abuts against the base, its rotation is restricted; when there is a gap between the ball head and the base, it can rotate. The headstock is connected to the ball head to allow the headstock to have multiple angles. The connector is inserted into the mounting slot 211 and engages with the mounting slot 211.

[0038] The mounting groove 211 is a recess provided on the main body 21. The mounting groove 211 can be provided on the side of the main body 21 away from the unlocking rod 23 along the first direction, so as to avoid the head frame fixing member 5 interfering with the movement of the unlocking rod 23.

[0039] The transmission assembly 22 is rotatably connected to the unlocking rod 23. When the transmission assembly 22 is subjected to a force along the second direction on one side, the transmission assembly 22 will rotate relative to the unlocking rod 23 without pushing the unlocking rod 23 to move along the first direction. When the transmission assembly 22 is subjected to forces on both sides along the second direction, the rotation of the transmission assembly 22 in the second direction is restricted. At this time, the transmission assembly 22 will convert the force in the second direction into a force along the first direction and push the unlocking rod 23 to move along the first direction.

[0040] The transmission assembly 22 may have inclined surfaces on both sides along the second direction, forming a tapered structure. When the two drive rods 24 abut against the two inclined surfaces, the force in the first direction is transmitted to the force in the second direction through the inclined surfaces. Alternatively, the transmission assembly 22 and the drive rods 24 may be connected by a connecting rod. In some embodiments, refer to... Figure 4 As shown, the transmission assembly 22 includes a balance bar 221 and two transmission links 222. The balance bar 221 extends along a second direction and is rotatably connected to the unlocking rod 23 at its middle part. The two transmission links 222 are rotatably connected to the two ends of the balance bar 221, and are rotatably connected to the two drive rods 24 respectively. The transmission links 222 convert the force of the drive rods 24 along the second direction into a force along the first direction, so that when the two drive rods 24 move closer or further away from each other, they jointly drive the unlocking rod 23 to slide away from or closer to the main body 21.

[0041] This configuration, employing a symmetrical transmission structure of balance bar 221 and double transmission link 222, ensures that the driving force of the two drive rods 24 can be synchronously transmitted to balance bar 221, preventing balance bar 221 from rotating due to untimely force transmission; the transmission link 222 has high force direction conversion efficiency, simple structure, and low cost.

[0042] Specifically, the balance bar 221 is a long strip extending horizontally along the second direction, with a circular through hole in its middle. The lower end of the unlocking rod 23 has a pin that matches the through hole, and the balance bar 221 is rotatably connected to the pin of the unlocking rod 23 through the through hole. The transmission link 222 is a straight rod, with through holes at both ends. The balance bar 221 also has through holes at both ends. A pin or a rotating shaft of a column passes through the through holes of the transmission link 222 and the through holes at the ends of the balance bar 221 to rotatably connect the transmission link 222 and the balance bar 221.

[0043] The unlocking lever 23 is located on one side of the two drive levers 24 along the first direction. The transmission link 222 is inclined toward the unlocking lever 23 along the first direction, so that the transmission link 222 has an angle with the second direction. When the drive lever 24 moves along the second direction, the inclined transmission link 222 can make the force along the second direction generate a component force along the first direction. The two drive levers 24 move closer to each other or further away from each other along the second direction, so that the forces of the two drive levers 24 along the second direction cancel each other out. The component force of the two drive levers 24 along the first direction drives the unlocking lever 23 to move along the first direction.

[0044] When the drive rod 24 moves in the horizontal direction, it will drive the transmission link 222 to rotate around the connection point with the balance bar 221, thereby pushing the balance bar 221 to rotate around the connection point with the unlocking rod 23.

[0045] The rotating arm assembly 3 has multiple rotating parts, and a locking structure is connected to the multiple rotating parts. When the locking structure is locked, it can restrict the relative rotation of the multiple rotating parts so that the position of the control mechanism 2 is fixed. When the locking structure is unlocked, the multiple rotating parts can rotate relative to each other, and the control mechanism 2 can move relative to the base 1 through the rotating arm assembly 3, thereby adjusting the position of the control mechanism 2 and the head frame mounted on it.

[0046] Reference Figure 1 , Figure 2 , Figure 8 and Figure 9As shown, in some embodiments, the rotating arm assembly 3 includes a cylindrical body 31 and a steering member 32; the locking structure includes two locking members 33; the two locking members 33 are respectively installed at both ends of the cylindrical body 31; the locking member 33 includes a rotating structure and a locking part disposed inside the rotating structure, the rotating structure having a rotating axis extending in a second direction, and when the locking part is in a locked state, the rotation of the rotating structure is restricted; one end of the rotating structure of the locking member 33 near the main body 21 is fixedly connected to the cylindrical body 31, and the other end is fixedly connected to the steering member 32; the locking member 33 away from the main body 21... One end of the rotating structure of 3 is fixedly connected to the cylindrical part 31, and the other end is fixedly connected to the base 1; the locking parts of the two locking parts 33 are connected in a transmission manner so that the two locking parts lock and unlock synchronously; when both locking parts are unlocked, the cylindrical part 31 rotates relative to the base 1 and the steering part 32 respectively through the two rotating structures; the end of the steering part 32 away from the cylindrical part 31 is bent toward the main body 21 and fixedly connected to the main body 21; a rotating part 321 is rotatably connected to the steering part 32, and the locking part of the locking part 33 near the main body 21 is connected in a transmission manner to the unlocking rod 23 through the rotating part 321.

[0047] With this configuration, the two locking members 33 can act as two pivots on the cylindrical member 31, allowing the cylindrical member 31 to drive the main body 21 to rotate relative to the base 1. Simultaneously, the main body 21 and the steering member 32 can rotate relative to the cylindrical member 31, improving the flexibility of adjusting the position of the main body 21. The steering member 32 connects the locking members 33 on the cylindrical member 31 to one side of the main body 21 along the first direction, ensuring that the two unlocking handles 4 are located on both sides of the rotating arm assembly 3 along the second direction, preventing interference between the rotating arm assembly 3 and the unlocking handles.

[0048] Specifically, locking members 33 can be bolted to both ends of the cylindrical component 31. The locking part of the locking member 33 is connected to a sliding rod movably connected to the outside of the cylindrical component 31, allowing the two locking parts to unlock synchronously. Alternatively, the cylindrical component 31 can be a hollow cylindrical tubular structure with two circular rotating holes on its side. The axes of the two rotating holes are parallel to each other and perpendicular to the axial direction of the cylindrical component 31. The two locking members 33 are coaxially installed in the two rotating holes. The rotating structure of the locking member 33 can be selected to include two rotatably connected columns, with the rotation axes of the two columns arranged along a second direction.

[0049] One column of the rotating structure of the locking member 33 near the main body 21 is fixedly connected to the cylindrical member 31, and the other column is fixedly connected to the steering member 32, so that the cylindrical member 31 can rotate relative to the steering member 32 when the locking part is unlocked. One column of the rotating structure of the locking member 33 away from the main body 21 is fixedly connected to the cylindrical member 31, and the other column is connected to the base 1, so that the cylindrical member 31 can rotate relative to the base 1 when the locking part is unlocked.

[0050] The steering member 32 has a first connecting portion extending in a first direction and a second connecting portion extending in a second direction, the second connecting portion being bent relative to the first connecting portion so that the steering member 32 forms an L-shaped structural member.

[0051] The rotating member 321 can be rotatably connected to the outside of the steering member 32, or the first connecting part and the second connecting part can both be cylindrical, and the interiors of the first connecting part and the second connecting part are connected to each other, so that the rotating member 321 is disposed inside the steering member 32.

[0052] One side of the main body 21 along the first direction is the first side, the unlocking rod 23 is disposed on the first side, the first connecting part is connected to the first side, so that the end of the unlocking rod 23 is rotatably connected to the rotating member 321, and the second connecting part is fixedly connected to the rotating structure.

[0053] A locking mechanism is positioned between the two pillars. This locking mechanism can be selected as two mating toothed sleeves, each movably connected to one of the two main bodies. When locked, the two toothed sleeves approach each other to engage, restricting the relative rotation of the two main bodies. When unlocked, the two toothed sleeves move away from each other, allowing the two pillars to rotate relative to each other. Alternatively, the locking mechanism can be a slot and a plug. When locked, the plug is inserted into the slot to restrict the relative rotation of the two pillars. When unlocked, the plug moves away from the slot to disengage, allowing the two pillars to rotate relative to each other.

[0054] In some embodiments, the rotating structure includes a first joint and a second joint, and the locking part includes a first latching member, a second latching member, an elastic member, and a movable shaft; the first joint and the second joint are rotatably connected and both are sleeved on the movable shaft; the first latching member is fixed to the side of the first joint facing the second joint; the second latching member is movably disposed between the first joint and the second joint and is fixedly connected to the movable shaft; the movable shaft is connected to the second latching member and is limited to the second joint to restrict the rotation of the second joint relative to the movable shaft; the elastic member is connected between the second latching member and the second joint to drive the second latching member to latch and lock with the first latching member; one end of the movable shaft is the unlocking end and the other end is the transmission end; the unlocking end is forced to drive the second latching member to overcome the elastic force of the elastic member and separate from the first latching member to unlock the locking member 33; the unlocking end of one locking member 33 is connected to the rotating member 321, and the transmission end is transmittedly connected to the unlocking end of the other locking member, so that when the unlocking rod 23 pushes one movable shaft to move, the other movable shaft moves synchronously.

[0055] With this configuration, the first and second locking components engage and disengage with each other through the movement of the movable shaft, conveniently achieving the locking and unlocking of the locking component 33; the elastic element drives the first and second locking components to engage, so that the locking component 33 is normally in the locked state, which meets the requirement that the head frame needs to maintain a stable position most of the time during use.

[0056] Specifically, both the first joint and the second joint are stepped cylindrical structures. Both the first joint and the second joint have mating holes in the middle. The side of the first joint facing the second joint is recessed to form a first mounting groove that communicates with the corresponding mating hole. The side of the second joint facing the first joint is recessed to form a second mounting groove that communicates with the corresponding mating hole. After the first joint and the second joint are rotatably connected, the two mating holes are coaxial.

[0057] The movable shaft passes through two mating holes, allowing both the first and second joints to move axially relative to the movable shaft. The movable shaft has a stop block on its side, and the second joint has a stop groove. The stop block is inserted into the stop groove to restrict the rotation of the second joint relative to the movable shaft. The movable shaft can be fixedly connected to the second snap-fit ​​member by bolts or welding.

[0058] Both the first and second locking components are annular structures. The first locking component is fixed in the first mounting groove, and the second locking component is disposed in the second mounting groove. Each of the first and second locking components has locking teeth on its opposite side. When the first and second locking components are engaged, the first joint cannot rotate relative to the second locking component; that is, the first and second joints cannot rotate relative to each other. When the first and second locking components are disengaged, the first joint can rotate relative to the second joint.

[0059] The cylindrical component 31 has a transmission cavity, in which a moving rod and two sector-shaped components are provided. The two sector-shaped components are rotatably installed in the transmission cavity at two rotating holes respectively. The moving rod is located between the two sector-shaped components and is rotatably connected to the two sector-shaped components, so that when one sector-shaped component rotates, it drives the other sector-shaped component to rotate through the moving rod.

[0060] The end of the movable shaft away from the second joint of the first joint is the unlocking end, and the other end of the movable shaft is the transmission end; the second joint of the locking member 33 near the main body 21 is connected to the cylindrical member 31, and the first joint is connected to the steering member 32, so that the unlocking end is outside the transmission cavity and is connected to the rotating member 321 of the steering member 32, and the transmission end is connected to a sector member inside the transmission cavity; the second joint of the locking member 33 away from the main body 21 is connected to the cylindrical member 31, and the first joint is connected to the base 1, so that the unlocking end is inside the transmission cavity and is connected to another sector member.

[0061] The second joint of a locking member 33 near the main body 21 is fixedly connected to the cylindrical member 31, and the first joint is connected to the steering member 32, with the unlocking end facing the steering member 32. The first joint of the locking member 33 away from the main body 21 is fixedly connected to the cylindrical member 31, and the second joint is fixedly connected to the base 1, with the unlocking end facing the cylindrical member 31 to connect to the transmission end of the locking member 33 near the main body 21.

[0062] When the unlocking lever 23 moves outward toward the main body 21 to apply force to the unlocking end of the locking member 33 near the main body 21 via the rotating member 321, the movable shaft of the locking member 33 near the main body 21 moves toward the transmission cavity to drive the second latching member and the first latching member to separate from each other, so that the cylindrical member 31 can rotate relative to the steering member 32; simultaneously, the movable shaft of the locking member 33 near the main body 21 moves toward the transmission cavity, so that the movable shaft pushes one sector member to rotate, and the moving lever drives another sector member to rotate, so that the unlocking end of the locking member 33 away from the main body 21 is also subjected to force, realizing the synchronous unlocking of the two locking members 33. At this time, the cylindrical member 31 can also rotate relative to the base 1, so that the main body 21 can flexibly adjust its position relative to the base 1.

[0063] When the unlocking end is not subjected to force, the elastic members in the two locking members 33 drive their respective second locking members to engage with the corresponding first locking members, thereby restricting the rotation of the first joint and the second locking member of the two locking members 33, so that the cylinder member 31 cannot rotate relative to the base 1 and the cylinder member 31 cannot rotate relative to the steering member 32, thus keeping the position of the main body 21 stable.

[0064] Two unlocking handles 4 are respectively installed on both sides of the main body 21 along the second direction, so that medical staff can stably adjust the position of the main body 21 when holding the two unlocking handles 4.

[0065] In some embodiments, the unlocking handle 4 includes a handle body 41, a pressing part 42, and a telescopic rod 43. The pressing part 42 is rotatably connected to the handle body 41, and the telescopic rod 43 is slidably connected to the handle body 41. One end of the telescopic rod 43 is drively connected to the drive rod 24, and the other end is rotatably connected to the pressing part 42. When the pressing part 42 rotates relative to the main body 21, it drives the telescopic rod 43 to slide, thereby driving the drive rod 24 to move in the second direction.

[0066] With this configuration, the pressing part 42 and the telescopic rod 43 work together to facilitate the rotation of the pressing part 42 when medical staff hold the handle body 41, thus reducing the operational intensity for medical staff.

[0067] Specifically, the handle body 41 has a hollow cylindrical structure. The side of the handle body 41 is provided with an assembly window that communicates with the internal space of the handle body 41. The pressing part 42 has a fan-shaped structure and is rotatably connected to the assembly window, so that the pressing part 42 can rotate in a direction that is closer to or farther away from the internal space of the handle body 41. The end of the handle body 41 is provided with a telescopic hole, and the telescopic rod 43 passes through the telescopic hole, so that the telescopic hole has a guiding effect on the extension and retraction of the telescopic rod 43. Alternatively, a guide seat with a groove is installed inside the handle body 41, and the telescopic rod and the guide seat cooperate with each other, so that the guide seat guides the telescopic rod to extend and retract the handle body 41.

[0068] The telescopic rod 43 is connected to the pressing part 42 in the space inside the handle body 41, so that when the pressing part 42 is pressed, the telescopic rod 43 is driven to extend from the handle body 41, and when the pressing part 42 is reset, the telescopic rod 43 is driven to retract and reset.

[0069] A spring is connected between the pressing part 42 and the handle body 41. When the pressing part 42 is pressed to rotate toward the inside of the handle body 41, the spring elastically deforms to accumulate elastic potential energy. When the pressing part 42 is stopped, the spring potential energy drives the pressing part 42 to reset.

[0070] The telescopic rod 43 may be equipped with a driven rack, which is arranged in the same direction as the telescopic rod 43. The handle body 41 is equipped with a gear, and the pressing part 42 is equipped with a driving rack in the part of the handle body 41. The driving rack is arc-shaped and meshes with the gear, and the driven rack meshes with the gear. When the pressing part 42 rotates, the driving rack drives the gear to rotate, and the gear drives the driven rack to rotate, thereby causing the telescopic rod 43 to extend or retract relative to the handle body 41.

[0071] Alternatively, the pressing part 42 and the telescopic rod 43 can be connected by a connecting rod, with both ends of the connecting rod rotatably connected to the telescopic rod 43 and the pressing part 42 respectively, so that when the pressing part 42 rotates, it can drive the telescopic rod 43 to extend and retract through the connecting rod.

[0072] The handle body 41 can be connected to the side of the main body 21 along the second direction, so that the end of the telescopic rod 43 is fixedly connected to the end of the drive rod 24. When the telescopic rod 43 extends, the drive rod 24 can be driven to move in a direction that brings them closer to each other.

[0073] Of course, in some embodiments, the unlocking handle 4 also includes a transmission arm 44 along a third direction. The transmission arm 44 is connected to one side of the main body 21 along the second direction and is connected to the drive rod 24. The handle body 41 is connected to the end of the transmission arm 44 away from the main body 21, and the telescopic rod 43 is connected to the transmission arm 44 to drive the drive rod 24 to slide along the second direction. The third direction is perpendicular to the plane containing the first direction and the second direction.

[0074] By setting a transmission arm 44 along a third direction, the handle body 41 is positioned away from the main body 21, effectively avoiding interference with other components when holding the handle body 41, and providing a more comfortable operating space for medical staff.

[0075] Specifically, the first and second directions are in the width and length directions of the main body 21, and the third direction is in the height direction of the main body 21; the transmission arm 44 extends along the height direction, so that the handle body 41 is located on the top side of the main body 21, making it convenient for medical staff to hold the handle body 41.

[0076] The handle body 41 can be set along the first direction on the transmission arm 44, or it can be set along the second direction, or it is not limited to the third direction. As long as the handle body 41 can be connected to the transmission arm 44 for transmission, so that the telescopic rod 43 can drive the drive rod 24 to move along the second direction when it extends or retracts.

[0077] In some embodiments, refer to Figure 6 and Figure 7 As shown, the transmission arm 44 includes a main arm body 441, a transmission rod, and two swing members 442. The two ends of the main arm body 441 are a first end and a second end, respectively. The two swing members 442 are rotatably connected to the first end and the second end, respectively. The transmission rod is slidably connected to the main arm body 441 and is disposed between the two swing members 442. The two ends of the transmission rod are rotatably connected to the two swing members 442, so that when one swing member 442 rotates, the other swing member 442 is driven to rotate synchronously through the transmission rod. The first end is connected to the main body 21, and the swing member 442 at the first end is rotatably connected to the drive rod 24. The second end is connected to the handle body 41, and the swing member 442 at the second end is rotatably connected to the telescopic rod 43.

[0078] With this configuration, the two swing members 442 and the transmission rod cooperate to achieve flexible transmission of driving force in different directions. This allows the telescopic rod 43 to drive the drive rod 24 to move in the second direction whenever the handle body 41 is positioned in different directions, through the cooperation of the swing members 442 and the transmission rod. Furthermore, the rotatable connection between the transmission rod and the two swing members 442 enables synchronous transmission of driving force, thus promptly driving the two drive rods 24 to move.

[0079] Specifically, the main boom 441 is a hollow tubular structure that extends along a third direction. The swing member 442 and the transmission rod can be set inside the main boom 441. The first and second ends of the main boom 441 are provided with openings, and the two swing members 442 are located at the two openings so that the two swing members 442 can be connected to the drive rod 24 and the telescopic rod 43 respectively.

[0080] The first end of the main boom 441 is provided with a connecting cylinder extending in a second direction. The opening of the first end is inside the connecting cylinder, which is fixedly connected to the main body 21. The end of the drive rod 24 is rotatably connected to the swing member 442 inside the connecting cylinder. The opening of the second end of the main boom 441 is connected to the handle body 41, so that the end of the telescopic rod 43 is rotatably connected to the swing member 442.

[0081] The transmission rod is arranged along the length of the main boom 441. A guide sleeve is provided inside the main boom 441, and the transmission rod slides through the guide sleeve. Both ends of the transmission rod are rotatably connected to the swing member 442 via a rotating shaft. When one swing member 442 rotates, it drives the transmission rod to slide along the length of the main boom 441, thereby driving the other swing member 442 to rotate. The swing member 442 can be fan-shaped or circular. The rotational connection points of the swing member 442 with the telescopic rod 43 and the drive rod 24 are spaced apart from the rotating shaft of the swing member 442, so that the telescopic rod 43 can drive the swing member 442 to rotate when it extends or retracts.

[0082] When medical staff press the compression point 42, both telescopic rods 43 extend and push a swing member 442 to rotate. This causes the transmission rod to drive the swing member 442, which is connected to the drive rod 24, to rotate. The rotation of the swing member 442 pushes the drive rod 24 towards the unlocking rod 23. When both compression points 42 are pressed, both telescopic rods 43 extend and drive the two drive rods 24 to move closer together, thus pushing the unlocking rod 23 to move.

[0083] Furthermore, in some embodiments, the rotating arm assembly 3 is connected to one side of the main body 21 along the first direction, and the handle body 41 extends along the first direction toward the rotating arm assembly 3.

[0084] This arrangement, placing the handle body 41 on one side of the transmission arm 44 along the first direction, reduces the space occupied by the headrest adjustment device in the second direction, and prevents medical staff from colliding with the handle body 41 when passing by the side of the headrest adjustment device, thus affecting the stability of the headrest.

[0085] Specifically, when the main body 21 is provided with a first channel and a second channel, the first channel forms an opening on the first side of the main body 21, and the rotating arm assembly 3 is connected to the first side, that is, the steering component 32 is connected to the first side.

[0086] The pivot of the swing member 442 at the first end of the main boom 441 is set along the first direction, which can effectively push the drive rod 24 to move in the second direction; the pivot of the swing member 442 at the second end is set along the second direction, which can convert the horizontal sliding of the telescopic rod 43 into its own rotation, and push the transmission rod to slide along the third direction, so as to transmit the driving force to the swing member 442 at the first end.

[0087] When the telescopic rod 43 extends or retracts in the first direction, it can drive the swing member 442 at the second end to rotate around the pivot and push the transmission rod to move downward. The downward movement of the transmission rod pushes the swing member 442 at the first end to rotate around the pivot and pushes the drive rod 24 to move in the second direction toward the unlocking rod 23. This ensures that when the handle body 41 is located on one side of the first direction, the extension or retraction of the telescopic rod 43 can drive the drive rod 24 to move in the second direction.

[0088] When the headrest adjustment device provided in this application embodiment is used, medical staff simultaneously hold the two handle bodies 41 and press the two pressing parts 42 at the same time. The pressing parts 42 drive the telescopic rod 43 to extend out of the handle body 41. After the telescopic rod 43 extends, it pushes the swing member 442 at the second end of the main arm body 441 to rotate, so that the transmission rod pushes the swing member 442 at the first end to rotate, thereby driving the drive rod 24 to move toward the unlocking rod 23. The two drive rods 24 approach each other and push the balance rod 221 to move along the first direction through the two transmission links 222, so that the unlocking rod 23 moves away from the main body 21.

[0089] The movement of the unlocking lever 23 away from the main body 21 will push the rotating member 321 in the steering member 32 to rotate. The rotation of the rotating member 321 will apply a pushing force to the unlocking end of the locking member 33 near the main body 21. The movable shaft of the locking member 33 near the main body 21 will move towards the interior of the cylindrical member 31. When the movable shaft moves, it will apply a force to the unlocking end of the movable shaft of the locking member 33 away from the main body 21 through the transmission structure inside the cylindrical member 31. Finally, the first and second locking members of the two locking members 33 will separate, so that the cylindrical member 31 can rotate relative to the steering member and the base 1.

[0090] After the two locking parts 33 are unlocked, the medical staff can push the main body 21 to move in the first and third directions while keeping their hands pressed on the pressing part 42, so as to adjust the position of the head frame connected to the head frame fixing part 5 on the main body 21.

[0091] After the head frame position is adjusted, the medical staff stop pressing the pressing part 42 with both hands, the telescopic rod 43 retracts, and the two swinging parts 442 and the transmission rod cooperate to make the drive rod 24 move away from the unlocking rod 23; the two drive rods 24 move away from each other so that the balance rod 221 drives the unlocking rod 23 to retract, so that the first and second locking parts of the two locking parts 33 engage with each other under the drive of the elastic part, so that the rotation of the cylinder part 31 relative to the steering part 32 and the base 1 is restricted, thereby locking the position of the main body 21 to fix the position of the head frame.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A headframe adjustment device, characterized in that, include: Base (1); The control mechanism (2) for installing the head frame includes a main body (21), a transmission assembly (22), an unlocking rod (23) slidably connected to the main body (21) along a first direction, and two drive rods (24) slidably connected to the main body (21) along a second direction intersecting the first direction. The two drive rods (24) are respectively disposed on both sides of the unlocking rod (23) along the second direction. The transmission assembly (22) is rotatably connected to the unlocking rod (23) and is in transmission cooperation with the two drive rods (24). The rotating arm assembly (3) is connected between the base (1) and the main body (21), and has a locking structure inside that can lock the rotating arm assembly (3) from moving. The unlocking rod (23) is connected to the locking structure in a transmission manner. Two unlocking handles (4) are located on both sides of the main body (21) and are respectively connected to the two drive rods (24); The two unlocking handles (4) drive the two drive rods (24) to move closer or further away from each other, so that the transmission assembly (22) is subjected to force on both sides to drive the unlocking rod (23) away from or closer to the main body (21) in the first direction, so as to unlock or lock the locking structure accordingly.

2. The headframe adjustment device according to claim 1, characterized in that, The main body (21) has a first channel extending along the first direction and a second channel extending along the second direction. One end of the first channel forms an opening on the surface of the main body (21), and the other end communicates with the second channel, which penetrates the main body (21) along the second direction. The two drive rods (24) are slidably disposed in the second channel and respectively arranged on both sides of the first channel along the second direction. The unlocking rod (23) is slidably connected in the first channel. The transmission assembly (22) is disposed in the main body (21).

3. The headframe adjustment device according to claim 1, characterized in that, The transmission assembly (22) includes a balance bar (221) and two transmission links (222). The balance bar (221) extends along the second direction and is rotatably connected to the unlocking rod (23) at its middle part. The two transmission links (222) are rotatably connected to the two ends of the balance bar (221), and the two transmission links (222) are rotatably connected to the two drive rods (24); The transmission link (222) converts the force of the drive rod (24) along the second direction into a force along the first direction, so that when the two drive rods (24) move closer or further away from each other, they jointly drive the unlocking rod (23) to slide away from or closer to the main body (21).

4. The headframe adjustment device according to claim 1, characterized in that, The unlocking handle (4) includes a handle body (41), a pressing part (42), and a telescopic rod (43). The pressing part (42) is rotatably connected to the handle body (41), and the telescopic rod (43) is slidably connected to the handle body (41). One end of the telescopic rod (43) is connected to the drive rod (24) and the other end is rotatably connected to the pressing part (42). When the pressing part (42) rotates relative to the main body part (21), it causes the telescopic rod (43) to slide, thereby driving the driving rod (24) to move along the second direction.

5. The headframe adjustment device according to claim 4, characterized in that, The unlocking handle (4) also includes a transmission arm (44) along a third direction, the transmission arm (44) being connected to one side of the main body (21) along the second direction and being connected to the drive rod (24) in a transmission connection. The handle body (41) is connected to the end of the transmission arm (44) away from the main body (21), and the telescopic rod (43) is connected to the transmission arm (44) to drive the drive rod (24) to slide along the second direction; the third direction is perpendicular to the plane containing the first direction and the second direction.

6. The headframe adjustment device according to claim 5, characterized in that, The transmission arm (44) includes a main arm body (441), a transmission rod, and two swinging components (442). The main arm (441) has a first end and a second end at its two ends, and two swing members (442) are rotatably connected to the first end and the second end, respectively. The transmission rod is slidably connected to the main arm (441) and is disposed between the two swing members (442). The two ends of the transmission rod are rotatably connected to the two swing members (442), so that when one swing member (442) rotates, the other swing member (442) is driven to rotate synchronously through the transmission rod. The first end is connected to the main body (21), and the swing member (442) at the first end is rotatably connected to the drive rod (24). The second end is connected to the handle body (41), and the swing member (442) at the second end is rotatably connected to the telescopic rod (43).

7. The headframe adjustment device according to claim 5, characterized in that, The rotating arm assembly (3) is connected to one side of the main body (21) along the first direction, and the handle body (41) extends along the first direction toward the rotating arm assembly (3).

8. The headframe adjustment device according to claim 1, characterized in that, It also includes a head frame fastener (5), and the main body (21) is provided with a mounting groove (211). A part of the head frame fastener (5) is snapped into the mounting groove (211) so that the head frame fastener (5) can be detachably connected to the main body (21).

9. The headframe adjustment device according to claim 1, characterized in that, The rotating arm assembly (3) includes a cylindrical component (31) and a steering component (32); the locking structure includes two locking components (33). The two locking members (33) are respectively installed at both ends of the cylindrical member (31); The locking member (33) includes a rotating structure and a locking part disposed inside the rotating structure. The rotating structure has a rotating axis extending along the second direction. When the locking part is in a locked state, the rotation of the rotating structure is restricted. One end of the rotating structure of the locking member (33) near the main body (21) is fixedly connected to the cylindrical member (31), and the other end is fixedly connected to the steering member (32); One end of the rotating structure of the locking member (33) away from the main body (21) is fixedly connected to the cylindrical member (31), and the other end is fixedly connected to the base (1); The locking parts of the two locking members (33) are connected in a driving manner so that the two locking parts lock and unlock synchronously; When both locking parts are unlocked, the cylindrical part (31) rotates relative to the base (1) and the steering part (32) respectively through the two rotating structures; The end of the steering member (32) away from the cylindrical member (31) is bent toward the main body (21) and fixedly connected to the main body (21); a rotating member (321) is rotatably connected to the steering member (32), and the locking part of the locking member (33) near the main body (21) is connected to the unlocking rod (23) through the rotating member (321).

10. The headframe adjustment device according to claim 9, characterized in that, The rotating structure includes a first joint and a second joint, and the locking part includes a first locking member, a second locking member, an elastic member, and a movable shaft; The first joint and the second joint are rotatably connected and both are sleeved on the movable shaft. The first snap-fit ​​member is fixed to the side of the first joint facing the second joint, and the second snap-fit ​​member is movably disposed between the first joint and the second joint and is fixedly connected to the movable shaft. The movable shaft is connected to the second snap-fit ​​member and is limited by the second joint to restrict the rotation of the second joint relative to the movable shaft; The elastic element is connected between the second snap-fit ​​member and the second joint to drive the second snap-fit ​​member to snap and lock with the first snap-fit ​​member; One end of the movable shaft is the unlocking end, and the other end is the transmission end. The unlocking end is driven by force to drive the second locking member to overcome the elastic force of the elastic member and separate from the first locking member, so as to unlock the locking member (33). The unlocking end of one of the locking members (33) is connected to the rotating member (321), and the transmission end is connected to the unlocking end of the other locking member (33) so that when the unlocking rod (23) pushes one of the movable shafts to move, the other movable shaft moves synchronously.

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