Rotation limiting device, sickbed and medical instrument

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a rotation limiting device, a sickbed and a medical instrument.The rotation limiting device comprises a first installation part, a second installation part and a third installation part, the second mounting part is rotationally arranged relative to the first mounting part, and the second mounting part is provided with a concave part; the convex part is movably connected with the first mounting part, so that the convex part can be clamped with or separated from the concave part; the device further comprises a locking mechanism and a triggering mechanism. According to the rotation limiting device provided by the invention, in the process of switching the guardrail among various states, a user only needs to turn over the guardrail, and the operation can be realized by a single hand, so that the operation process of adjusting the state of the guardrail by the user is simplified, the use experience of the user is improved, and the user experience is improved. And particularly, the use experience of the mobility-disabled user is improved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a rotation limiting device, a hospital bed, and medical devices. Background Technology

[0002] Installing side rails on hospital beds equipped with medical equipment such as CT (X-ray computed tomography) and MRI (magnetic resonance imaging) effectively prevents patients from falling. To facilitate patient access to and from the bed, the rails need to be reversible. To balance flexibility and safety, a limiting structure is required between the rails and the bed frame to maintain the rails in a specific position and allow them to be released from those positions. Current limiting structures are cumbersome to operate, typically requiring one hand to trigger the limit switch and the other to rotate the rails. This is clearly inconvenient for patients with limited mobility and fails to meet user needs. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a rotation limiting device, a hospital bed, and a medical device that facilitates the locking and switching of guardrails in different positions.

[0004] To achieve the above and other related objectives, the present invention provides a rotation limiting device, comprising:

[0005] A first mounting part, wherein a protrusion is mounted on the first mounting part;

[0006] The second mounting part is rotatably disposed relative to the first mounting part, and the second mounting part is provided with a recess;

[0007] The second mounting portion has at least one first relative position relative to the first mounting portion, which enables the recess to be aligned with the protrusion;

[0008] The protrusion is movably connected to the first mounting portion so that the protrusion can engage or disengage with the recess.

[0009] The protrusion and the recess are configured to prevent the second mounting portion from rotating relative to the first mounting portion in a first direction of rotation when they engage with each other.

[0010] It also includes a locking mechanism and a triggering mechanism, the locking mechanism being configured to switch between the following workstations:

[0011] The locking position, wherein the locking mechanism holds the protrusion separate from the recess; and

[0012] At the unlocking station, the locking mechanism releases the protrusion, allowing it to move freely.

[0013] The triggering mechanism is configured such that when the second mounting part is located at a preset second relative position relative to the first mounting part, the triggering mechanism can drive the locking mechanism to switch to the locking position, and when the second mounting part is located at a preset third relative position relative to the first mounting part, the triggering mechanism can drive the locking mechanism to switch to the unlocking position.

[0014] The second mounting part is assembled such that when it rotates relative to the first mounting part along the first direction of rotation, it sequentially passes through the second relative position, the first relative position, and the third relative position.

[0015] In an optional embodiment of the present invention, the protrusion and / or the recess is provided with a first guide portion, the first guide portion being configured to guide the protrusion located in the recess to separate from the recess when the second mounting portion rotates relative to the first mounting portion in a second rotation direction; the second rotation direction is a rotation direction opposite to the first rotation direction.

[0016] In an optional embodiment of the present invention, an elastic element is provided between the protrusion and the first mounting portion, and the elastic element is configured such that its elastic force can drive the protrusion to engage with the recess.

[0017] In an optional embodiment of the present invention, the locking mechanism includes a locking pin and a locking groove, one of which is disposed on the protrusion and the other is disposed on the first mounting portion; during the active stroke of the protrusion, there is a first position in which the protrusion is separated from the recess and the locking pin is aligned with the locking groove; the locking position refers to the position in which the locking pin is engaged with the locking groove, and the unlocking position refers to the position in which the locking pin is separated from the locking groove.

[0018] In an optional embodiment of the present invention, the triggering mechanism includes a first triggering part and a second triggering part, the first triggering part and the second triggering part being mounted on the second mounting part. The first triggering part is configured such that when the second mounting part is in the second relative position, the first triggering part drives the locking pin to engage with the locking groove, so that the protrusion is held in the first position. The second triggering part is configured such that when the second mounting part is in the third relative position, the second triggering part drives the locking pin to disengage from the locking groove, so that the protrusion is released from the first position.

[0019] In an optional embodiment of the present invention, the second mounting portion is provided with a limiting surface and a second guide portion. When the second mounting portion rotates along the second direction from the third relative position to the second relative position and is not in the first relative position, the protrusion always abuts against the limiting surface. When the protrusion abuts against the limiting surface, the locking pin and the locking groove are in a misaligned state. The second guide portion protrudes from the limiting surface and is configured such that when the second mounting portion rotates along the second direction to the second relative position, the second guide portion can drive the protrusion to move to the first position.

[0020] In an optional embodiment of the present invention, the direction of movement of the protrusion is parallel to the rotation axis of the second mounting portion, the limiting surface is the end face of the second mounting portion opposite to the first mounting portion, and the recess is disposed on the limiting surface.

[0021] In an optional embodiment of the present invention, the locking pin is connected to the protrusion, the locking pin is radially extended along the protrusion, the protrusion and / or the locking pin are rotatably disposed relative to the first mounting part, and its rotation axis is parallel to the rotation axis of the second mounting part; the locking groove is disposed on the first mounting part, and the first mounting part is further provided with a relief groove communicating with the locking groove, wherein the locking groove has a certain length in a direction perpendicular to the rotation axis of the second mounting part, the relief groove has a certain length in a direction parallel to the rotation axis of the second mounting part, and the locking pin is inserted into the locking groove and the relief groove.

[0022] In an optional embodiment of the present invention, the first triggering part includes a first lever fixedly connected to the second mounting part. The first lever is configured such that when the second mounting part rotates along the second direction to the second relative position, the first lever abuts against the locking pin and pushes the locking pin from the clearance groove into the locking groove. The second triggering part includes a second lever fixedly connected to the second mounting part. The second lever is configured such that when the second mounting part rotates along the first direction to the third relative position, the second lever abuts against the locking pin and pushes the locking pin from the locking groove into the clearance groove.

[0023] In an optional embodiment of the present invention, the second guide portion includes a boss disposed on the end face of the second mounting portion, one side of the boss being flush with the sidewall of one of the recesses.

[0024] To achieve the above and other related objectives, the present invention also provides a hospital bed, including the aforementioned rotation limiting device, and

[0025] Bed frame;

[0026] A guardrail is installed on at least one side of the bed frame and is rotatably connected to the bed frame;

[0027] One of the first mounting part and the second mounting part is fixedly connected to the bed frame, and the other is fixedly connected to the guardrail; when the second mounting part rotates relative to the first mounting part in the second rotation direction, the guardrail flips upward.

[0028] In an optional embodiment of the present invention, the second mounting part has at least two first relative positions. When the second mounting part is located in one of the first relative positions, the guardrail is flush with the bed frame. When the second mounting part is located in the other first relative position, the guardrail stands above the bed frame.

[0029] To achieve the above and other related objectives, the present invention also provides a medical device, including the aforementioned hospital bed.

[0030] The technical effect of the present invention is that the rotation limit device provided by the present invention allows the user to simply flip the guardrail during the switching between various states. This operation can be performed with one hand, which simplifies the operation process when the user adjusts the state of the guardrail and improves the user experience, especially for users with mobility impairments. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the movement principle of the bed rail provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the installation structure of the bed rail provided in an embodiment of the present invention;

[0033] Figure 3 This is an exploded view of the rotation limiting device provided in an embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional view of the bed rail provided in an embodiment of the present invention in a first state;

[0035] Figure 5 This is a perspective view of the rotation limiting device provided in an embodiment of the present invention in a first state;

[0036] Figure 6 This is a front view of the rotation limiting device provided in an embodiment of the present invention in a first state;

[0037] Figure 7 yes Figure 6 AA section view;

[0038] Figure 8This is a cross-sectional view of the bed rail provided in the second state according to an embodiment of the present invention;

[0039] Figure 9 This is a perspective view of the rotation limiting device provided in an embodiment of the present invention in a second state;

[0040] Figure 10 This is a front view of the rotation limiting device provided in the embodiment of the present invention in the second state;

[0041] Figure 11 yes Figure 10 BB section view;

[0042] Figure 12 This is a cross-sectional view of the bed rail provided in the third state according to an embodiment of the present invention;

[0043] Figure 13 This is a perspective view of the rotation limiting device provided in an embodiment of the present invention in a third state;

[0044] Figure 14 This is a front view of the rotation limiting device provided in the embodiment of the present invention in the third state;

[0045] Figure 15 yes Figure 14 CC section view;

[0046] Figure 16 This is a cross-sectional view of the bed rail provided in the fourth state according to an embodiment of the present invention;

[0047] Figure 17 This is a perspective view of the rotation limiting device provided in the embodiment of the present invention in the fourth state;

[0048] Figure 18 This is a front view of the rotation limiting device provided in the embodiment of the present invention in the fourth state;

[0049] Figure 19 yes Figure 18 DD sectional view;

[0050] Figure 20 This is a perspective view of the rotation limiting device provided in the embodiment of the present invention in the fifth state;

[0051] Figure 21 This is a front view of the rotation limiting device provided in the embodiment of the present invention in the fifth state;

[0052] Figure 22 yes Figure 21 EE sectional view. Detailed Implementation

[0053] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0054] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0055] Embodiments of the present invention provide a hospital bed that can be used, for example, in medical equipment such as CT and MRI machines. (See attached document.) Figure 1 , 2 As shown, the hospital bed includes a bed frame 100, a guardrail 200, and a rotation limiting device 300, wherein the guardrail 200 is installed on at least one side of the bed frame 100 and is rotatably connected to the bed frame 100.

[0056] It should be understood that the rotatable connection between the guardrail 200 and the bed frame 100 allows the guardrail 200 to be adjusted between different states to meet the needs of different application scenarios. Figure 1 Taking the shown states as examples, when the guardrail 200 is in the first state a, the guardrail 200 hangs below the bed 100, which facilitates the patient getting on and off the bed and saves more space when the bed is not in use; when the guardrail 200 is in the second state c1, the guardrail 200 is flush with the bed 100, which can serve as an extension of the load-bearing surface of the bed 100, increasing the effective support area of ​​the bed; when the guardrail 200 is in the third state c2, the guardrail 200 stands above the bed 100, which can prevent the patient from rolling over and falling.

[0057] However, to achieve the above-mentioned functions of the guardrail 200 in the second state c1 and the third state c2, it is necessary to limit the guardrail 200 in these two states to prevent the guardrail 200 from rotating along the first rotation direction r1. For this purpose, the present invention provides the rotation limiting device 300 between the guardrail 200 and the bed 100.

[0058] like Figure 3 , 5As shown in Figure 7, the rotation limiting device 300 includes a first mounting part 10, a second mounting part 20, a locking mechanism, and a triggering mechanism. The first mounting part 10 is provided with a protrusion 11. The second mounting part 20 is rotatably disposed relative to the first mounting part 10 and is provided with a recess. The second mounting part 20 has at least one first relative position relative to the first mounting part 10, which enables the recess to be aligned with the protrusion 11. The protrusion 11 is movably connected to the first mounting part 10 so that the protrusion 11 can engage or disengage with the recess.

[0059] In a specific embodiment, the direction of movement of the protrusion 11 is parallel to the rotation axis of the second mounting portion 20, and the recess is disposed on the end face of the second mounting portion 20. It should be understood that the mounting method of the protrusion 11 is not unique. For example, in some other embodiments, the protrusion 11 may also move radially along the second mounting portion 20, in which case the recess may be correspondingly disposed on the circumferential surface of the second mounting portion 20.

[0060] The protrusion 11 and the recess are configured such that when they engage with each other, they can prevent the second mounting portion 20 from rotating relative to the first mounting portion 10 in a first rotation direction r1, while the second mounting portion 20 can still rotate relative to the first mounting portion 10 in a second rotation direction r2.

[0061] Please see Figure 3 , 9 As shown in -11, when the protrusion 11 engages with the recess, in order to allow the second mounting part 20 to rotate along the second rotation direction r2, a first guide part can be provided in the protrusion 11 and / or the recess. The first guide part is configured to guide the protrusion 11 located in the recess to separate from the recess when the second mounting part 20 rotates relative to the first mounting part 10 along the second rotation direction r2.

[0062] In a specific embodiment, the first guide portion may include, for example, a wedge-shaped surface provided on the protrusion 11 and a rounded corner provided on one side edge of the recess. It should be understood that the structure of the first guide portion is not unique. For example, in some other embodiments, a wedge-shaped surface may also be provided on one side edge of the recess.

[0063] There can be multiple first relative positions. When there are multiple first relative positions, the number of recesses or protrusions 11 should also be increased accordingly, so that when the second mounting part 20 is located in each first relative position, there are protrusions 11 and recesses that can engage with each other.

[0064] Figure 2In the illustrated embodiment, the first mounting part 10 is fixedly connected to the bed frame 100, and the second mounting part 20 is fixedly connected to the guardrail 200. It should be understood that the constraint effect between the first mounting part 10 and the second mounting part 20 is mutual, so the mounting positions of the first mounting part 10 and the second mounting part 20 can be interchanged. For example, in some other embodiments, the first mounting part 10 can be fixedly connected to the guardrail 200, and the second mounting part 20 can be fixedly connected to the bed frame 100.

[0065] Figure 4-22 In the illustrated embodiment, since the guardrail 200 needs to be locked in both the second state c1 and the third state c2, the second mounting part 20 in this embodiment has two first relative positions, which respectively correspond to Figure 1 The guardrail 200 has a second state c1 and a third state c2; correspondingly, there are two recesses, namely a first recess 21a and a second recess 21b. It should be understood that the number of the first relative positions and the number of recesses can be increased or decreased according to actual needs. For example, in some other embodiments, when it is only necessary to lock the guardrail 200 in the upright state, there may be only one first relative position and the number of recesses.

[0066] The present invention provides a one-way check mechanism similar to a ratchet mechanism between the first mounting part 10 and the second mounting part 20. This mechanism only prevents the guardrail 200 from rotating along the first rotation direction r1. Therefore, the user can switch the guardrail 200 between different states by operating it with one hand to rotate it along the second rotation direction r2. Based on this function, since the guardrail 200 cannot rotate 360° due to the obstruction of the bed frame 100, a corresponding mechanism is also needed to allow the guardrail 200 to flip and reset along the first rotation direction r1. Therefore, the present invention provides the following locking mechanism and triggering mechanism:

[0067] The locking mechanism is configured to switch between a locking position and an unlocking position; in the locking position, the locking mechanism holds the protrusion 11 in a state separated from the recess; in the unlocking position, the locking mechanism releases the protrusion 11 to allow it to move freely; the triggering mechanism is configured to drive the locking mechanism to switch to the locking position when the second mounting part 20 is located at a preset second relative position relative to the first mounting part 10, and to drive the locking mechanism to switch to the unlocking position when the second mounting part 20 is located at a preset third relative position relative to the first mounting part 10; the second mounting part 20 rotates along the first rotation direction r1 relative to the first mounting part 10, sequentially passing through the second relative position, the first relative position, and the third relative position.

[0068] Please see Figure 1 , 16 As shown in -19, the second relative position of the second mounting part 20 corresponds to the fourth state b of the guardrail 200. Please refer to [link / reference]. Figure 1 , 4 As shown in Figure -7, the third relative position of the second mounting part 20 corresponds to the first state a of the guardrail 200. The specific process and principle of the guardrail 200 switching between several states are as follows:

[0069] by Figure 1 , 4 -7 shows the first state a of guardrail 200 as the initial position. When the user needs to adjust guardrail 200 to the second state c1, they only need to operate guardrail 200 to rotate along the second rotation direction r2. When guardrail 200 reaches the second state c1, as shown... Figure 8-11 As shown, the protrusion 11 aligns and engages with the first recess 21a, thereby preventing the guardrail 200 from flipping along the first rotation direction r1; when the user needs to adjust the guardrail 200 to the third state c2, they only need to operate the guardrail 200 to continue flipping along the second rotation direction r2. When the guardrail 200 reaches the third state c2, as shown... Figure 12-15 As shown, the protrusion 11 aligns and engages with the second recess 21b, thereby preventing the guardrail 200 from flipping along the first rotation direction r1; when the user needs to reset the guardrail 200, first operate the guardrail 200 to continue flipping along the second rotation direction r2 to the fourth state b, as shown. Figure 16-19 As shown, at this time, the locking mechanism keeps the protrusion 11 separated from the concave part, so the user can operate the guardrail 200 to rotate along the first direction r1 to the first state a. When the guardrail 200 reaches the first state a, as... Figure 4-7 As shown, the locking mechanism releases the protrusion 11, thereby ensuring that when the guardrail 200 reaches the second state c1 and the third state c2 again, the protrusion 11 can continue to prevent the guardrail 200 from flipping along the first rotation direction r1.

[0070] Please see Figure 4-7 As shown, in a further embodiment, a limiting groove 24 can also be provided on the second mounting part 20. When the guardrail 200 is in the first state a, the protrusion 11 can engage with the limiting groove 24 to ensure that the guardrail 200 can remain stable even in the stored state. In some other embodiments, if the stability of the guardrail 200 in the stored state is not considered, the limiting groove 24 can also be omitted.

[0071] During the switching between the various states of the guardrail 200, the user only needs to perform a flipping operation on the guardrail 200, which can be achieved entirely with one hand. Therefore, the rotation limit device 300 provided by the present invention simplifies the operation process when the user adjusts the state of the guardrail 200. This simplification of the operation process is crucial for users with mobility impairments.

[0072] Please see Figure 3 As shown, in an optional embodiment of the present invention, an elastic element 13 is provided between the protrusion 11 and the first mounting portion 10. The elastic element 13 is configured such that its elastic force can drive the protrusion 11 to engage with the recess. In a specific embodiment, the elastic element 13 may include, for example, a compression spring, which can be disposed between the protrusion 11 and the first mounting portion 10. The elastic element 13 can drive the protrusion 11 to stably engage with the recess and prevent the protrusion 11 from disengaging from the recess due to shaking. It should be understood that in some other embodiments, the elastic element 13 can also be replaced by a structure with a force storage function, such as a magnet. When the direction of movement of the protrusion 11 is vertical, the elastic element 13 can be directly omitted, and the engagement between the protrusion 11 and the recess can be achieved solely by the gravity of the protrusion 11.

[0073] Please see Figure 3 As shown, in an optional embodiment of the present invention, the locking mechanism includes a locking pin 12 and a locking groove 14, one of the locking pin 12 and the locking groove 14 being disposed on the protrusion 11 and the other being disposed on the first mounting portion 10.

[0074] Please see Figure 3 As shown, in a specific embodiment, the locking pin 12 is connected to the protrusion 11, and the locking pin 12 protrudes radially along the protrusion 11. The protrusion 11 and / or the locking pin 12 are rotatably disposed relative to the first mounting portion 10, and their rotation axis is parallel to the rotation axis of the second mounting portion 20. In the illustrated embodiment, the locking pin 12 can be fixedly connected to the protrusion 11, so that both can be rotatably disposed relative to the first mounting portion 10. Specifically, a threaded hole 111 can be provided on the protrusion 11, and an external thread can be provided on the locking pin 12. The locking pin 12 is connected to the threaded hole 111 through the external thread. In some other embodiments, the locking pin 12 can be allowed to rotate relative to the first mounting portion 10. Specifically, the locking pin 12 can be rotatably connected to the protrusion 11. In this case, the rotation of the locking pin 12 will not cause the protrusion 11 to rotate.

[0075] Please see Figure 3As shown, the locking groove 14 is disposed on the first mounting part 10, and the first mounting part 10 is also provided with a relief groove 15 communicating with the locking groove 14. The locking groove 14 has a certain length along a direction perpendicular to the rotation axis of the second mounting part 20, and the relief groove 15 has a certain length along a direction parallel to the rotation axis of the second mounting part 20. The locking pin 12 is inserted into the locking groove 14 and the relief groove 15. During the active stroke of the protrusion 11, there is a first position where the protrusion 11 is separated from the concave part, and the locking pin 12 is aligned with the locking groove 14. The locking position refers to the position where the locking pin 12 is engaged with the locking groove 14, and the unlocking position refers to the position where the locking pin 12 is separated from the locking groove 14. Figure 6 , 21 As shown, when the locking pin 12 moves along the axis with the protrusion 11, the clearance groove 15 can prevent the locking pin 12 from interfering with the first mounting part 10.

[0076] It should be understood that in some other embodiments, the locking pin 12 may be disposed on the first mounting portion 10 and the locking groove 14 may be disposed on the protrusion 11. For example, the locking pin 12 may be movably connected to the first mounting portion 10 along its own axial direction, and the locking groove 14 may be disposed as a hole on the surface of the protrusion 11. When the protrusion 11 is in the first position, the locking pin 12 may be engaged or disengaged from the locking groove 14 by sliding along its own axial direction.

[0077] like Figure 3 As shown, the triggering mechanism includes a first triggering part 25 and a second triggering part 26, which are mounted on the second mounting part 20; Figure 16-19 As shown, the first trigger 25 is assembled such that when the second mounting portion 20 is in the second relative position, the first trigger 25 drives the locking pin 12 to engage with the locking groove 14, so that the protrusion 11 is held in the first position; as Figure 4-7 As shown, the second trigger 26 is assembled such that when the second mounting part 20 is in the third relative position, the second trigger 26 drives the locking pin 12 to separate from the locking groove 14, so that the protrusion 11 is released from the first position.

[0078] Specifically, such as Figure 16-19 As shown, the first triggering part 25 may include a first lever fixedly connected to the second mounting part 20. The first lever is configured such that when the second mounting part 20 rotates along the second rotation direction r2 to the second relative position, the first lever abuts against the locking pin 12 and pushes the locking pin 12 from the relief groove 15 into the locking groove 14; Figure 4-7As shown, the second triggering part 26 may include a second lever fixedly connected to the second mounting part 20. The second lever is configured such that when the second mounting part 20 rotates along the first rotation direction r1 to the third relative position, the second lever abuts against the locking pin 12 and pushes the locking pin 12 from the locking groove 14 into the clearance groove 15.

[0079] It should be understood that, since the swing axis of the locking pin 12 in the illustrated embodiment is parallel to the rotation axis of the second mounting portion 20, the first lever and the second lever are arranged along the axial direction of the second mounting portion 20. In some other embodiments, when the arrangement of the protrusion 11, the recess, the locking pin 12 and the locking groove 14 changes, the structure of the first trigger portion 25 and the second trigger portion 26 can also be adapted. For example, when the protrusion 11 moves radially along the second mounting portion 20, the swing axis of the locking pin 12 should be perpendicular to the axis of the second mounting portion 20. At this time, the first lever and the second lever can be arranged radially along the second mounting portion 20.

[0080] Please see Figure 3 , 20 As shown in Figure 22, the second mounting portion 20 is provided with a limiting surface 22 and a second guide portion 23. When the second mounting portion 20 rotates along the second rotation direction r2 from the third relative position to the second relative position and is not in the first relative position, the protrusion 11 always abuts against the limiting surface 22. When the protrusion 11 abuts against the limiting surface 22, the locking pin 12 and the locking groove 14 are in a non-aligned state. The second guide portion 23 protrudes from the limiting surface 22 and is configured such that when the second mounting portion 20 rotates along the second rotation direction r2 to the second relative position, the second guide portion 23 can drive the protrusion 11 to move to the first position. The second guide portion 23 includes a boss provided on the end face of the second mounting portion 20.

[0081] Please see Figure 18 , 21 As shown, in this embodiment, the distance between the end face of the boss and the first mounting part 10 is less than the distance between the limiting surface 22 and the first mounting part 10. Only when the protrusion 11 abuts against the end face of the boss can the locking pin 12 be aligned with the locking groove 14. When the protrusion 11 abuts against the limiting surface 22, there is a certain misalignment between the locking pin 12 and the locking groove 14. This can prevent the locking pin 12 from entering the locking groove 14 due to accidental contact during the rotation of the second mounting part 20 along the second rotation direction r2.

[0082] In the illustrated embodiment, since the protrusion 11 is movably disposed along the axial direction of the second mounting portion 20, the limiting surface 22 is the end face of the second mounting portion 20 opposite to the first mounting portion 10; in some other embodiments, when the protrusion 11 is movably disposed along the radial direction of the second mounting portion 20, the limiting surface 22 may be the circumferential surface of the second mounting portion 20, and the corresponding boss should also be disposed on the circumferential surface of the second mounting portion 20.

[0083] Please see Figure 3 As shown, one side of the boss is flush with the sidewall of one of the recesses. It should be noted that when there are multiple recesses, the boss should be flush with the sidewall of the last recess on the second rotation direction r2. In the illustrated embodiment, the boss is flush with the sidewall of the second recess 21b. This allows the protrusion 11 to move to the first position immediately after separating from the recess, avoiding unnecessary idle travel.

[0084] Please see Figure 3 As shown, in a specific embodiment, the specific assembly method between the first mounting part 10 and the second mounting part 20 is as follows:

[0085] A fixed shaft 30 can be provided between the first mounting part 10 and the second mounting part 20. The first mounting part 10 can have a shaft hole 101 that mates with the fixed shaft 30. The fixed shaft 30 has a protruding ring 31 and a first annular groove 32. The fixed shaft 30 is inserted into the shaft hole 101. One end face of the protruding ring 31 is in contact with one end face of the first mounting part 10. A first retaining spring 16 is provided in the first annular groove 32, and the first retaining spring 16 is in contact with the other end face of the first mounting part 10, thus achieving axial positioning between the fixed shaft 30 and the first mounting part 10. A key 34 and a keyway 102 can be provided between the fixed shaft 30 and the first mounting part 10 to achieve circumferential positioning between them. Please refer to [link to relevant documentation]. Figure 5 As shown, the first mounting part 10 can be fixed to the side of the bed 100 by a mounting bracket 40.

[0086] A bearing 27 is provided between the fixed shaft 30 and the second mounting part 20. The fixed shaft 30 is also provided with a second annular groove 33. The other end face of the convex ring 31 abuts against one end of the inner ring of the bearing 27. A second snap ring 29 is provided in the second annular groove 33. The second snap ring 29 abuts against the other end of the inner ring of the bearing 27, thereby realizing the connection between the fixed shaft 30 and the bearing 27. The second mounting part 20 is provided with a through hole. The inner wall of the through hole is provided with a step and an annular groove. One end of the outer ring of the bearing 27 abuts against the step in the through hole, and the other end abuts against the third snap ring 28 provided in the annular groove, thereby realizing the connection between the bearing 27 and the second mounting part 20.

[0087] In this embodiment, the rotation limiting device 300 is used to limit the guardrail 200 and also acts as a hinge between the guardrail 200 and the bed 100. Therefore, the aforementioned fixed shaft 30 needs to be provided between the first mounting part 10 and the second mounting part 20. In other embodiments, when there is an independent hinge between the guardrail 200 and the bed 100, the first mounting part 10 and the second mounting part 20 do not need to be connected. It is sufficient to install the first mounting part 10 and the second mounting part 20 on the bed 100 and the guardrail 200 respectively.

[0088] In summary, during the switching between different states of the guardrail 200 of the present invention, the user only needs to perform a flipping operation on the guardrail 200. This operation can be performed with one hand, simplifying the user's operation process when adjusting the state of the guardrail 200 and improving the user experience, especially for users with mobility impairments. Furthermore, the guardrail 200 of the present invention can be locked in multiple different states, adapting to the usage needs of various application scenarios.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0090] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention. Furthermore, nouns and pronouns relating to persons in this disclosure are not limited to specific genders.

Claims

1. A rotation limiting device, characterized in that, include: A first mounting part, wherein a protrusion is mounted on the first mounting part; The second mounting part is rotatably disposed relative to the first mounting part, and the second mounting part is provided with a recess; The second mounting portion has at least one first relative position relative to the first mounting portion, which enables the recess to be aligned with the protrusion; The protrusion is movably connected to the first mounting portion so that the protrusion can engage or disengage with the recess. The protrusion and the recess are configured to prevent the second mounting portion from rotating relative to the first mounting portion in a first direction of rotation when they engage with each other. It also includes a locking mechanism and a triggering mechanism, the locking mechanism being configured to switch between the following workstations: The locking position, wherein the locking mechanism holds the protrusion separate from the recess; and At the unlocking station, the locking mechanism releases the protrusion, allowing it to move freely. The triggering mechanism is configured such that when the second mounting part is located at a preset second relative position relative to the first mounting part, the triggering mechanism can drive the locking mechanism to switch to the locking position, and when the second mounting part is located at a preset third relative position relative to the first mounting part, the triggering mechanism can drive the locking mechanism to switch to the unlocking position. The second mounting part is assembled such that when it rotates relative to the first mounting part along the first direction of rotation, it sequentially passes through the second relative position, the first relative position, and the third relative position.

2. The rotation limiting device according to claim 1, characterized in that, The protrusion and / or the recess are provided with a first guide portion, which is configured to guide the protrusion located in the recess to separate from the recess when the second mounting portion rotates relative to the first mounting portion in a second rotation direction; the second rotation direction is a rotation direction opposite to the first rotation direction.

3. The rotation limiting device according to claim 1, characterized in that, An elastic element is provided between the protrusion and the first mounting portion, and the elastic element is assembled such that its elastic force can drive the protrusion to engage with the recess.

4. The rotation limiting device according to claim 1, characterized in that, The locking mechanism includes a locking pin and a locking groove. One of the locking pin and the locking groove is disposed on the protrusion, and the other is disposed on the first mounting portion. During the active stroke of the protrusion, there is a first position in which the protrusion is separated from the concave portion, and the locking pin is aligned with the locking groove. The locking position refers to the position where the locking pin and the locking groove are engaged, and the unlocking position refers to the position where the locking pin and the locking groove are separated.

5. The rotation limiting device according to claim 4, characterized in that, The triggering mechanism includes a first triggering part and a second triggering part, which are mounted on the second mounting part. The first triggering part is configured such that when the second mounting part is in the second relative position, the first triggering part drives the locking pin to engage with the locking groove, so that the protrusion is held in the first position. The second triggering part is configured such that when the second mounting part is in the third relative position, the second triggering part drives the locking pin to disengage from the locking groove, so that the protrusion is released from the first position.

6. The rotation limiting device according to claim 5, characterized in that, The second mounting portion is provided with a limiting surface and a second guide portion. When the second mounting portion rotates along the second direction from the third relative position to the second relative position and is not in the first relative position, the protrusion always abuts against the limiting surface. When the protrusion abuts against the limiting surface, the locking pin and the locking groove are in a misaligned state. The second guide portion protrudes from the limiting surface and is configured such that when the second mounting portion rotates along the second direction to the second relative position, the second guide portion can drive the protrusion to move to the first position.

7. The rotation limiting device according to claim 6, characterized in that, The convex part moves in a direction parallel to the rotation axis of the second mounting part, the limiting surface is the end face of the second mounting part opposite to the first mounting part, and the concave part is provided on the limiting surface.

8. The rotation limiting device according to claim 7, characterized in that, The locking pin is connected to the protrusion, and the locking pin extends radially along the protrusion. The protrusion and / or the locking pin are rotatably disposed relative to the first mounting part, and their rotation axis is parallel to the rotation axis of the second mounting part. The locking groove is disposed on the first mounting part, and the first mounting part is also provided with a relief groove communicating with the locking groove. The locking groove has a certain length in a direction perpendicular to the rotation axis of the second mounting part, and the relief groove has a certain length in a direction parallel to the rotation axis of the second mounting part. The locking pin is inserted into the locking groove and the relief groove.

9. The rotation limiting device according to claim 8, characterized in that, The first triggering part includes a first lever fixedly connected to the second mounting part. The first lever is configured such that when the second mounting part rotates along the second direction to the second relative position, the first lever abuts against the locking pin and pushes the locking pin from the clearance groove into the locking groove. The second triggering part includes a second lever fixedly connected to the second mounting part. The second lever is configured such that when the second mounting part rotates along the first direction to the third relative position, the second lever abuts against the locking pin and pushes the locking pin from the locking groove into the clearance groove.

10. The rotation limiting device according to claim 7, characterized in that, The second guide portion includes a boss disposed on the end face of the second mounting portion, one side of the boss being flush with the sidewall of one of the recesses.

11. A hospital bed, characterized in that, Including the rotation limiting device as described in any one of claims 1 to 10, and Bed frame; A guardrail is installed on at least one side of the bed frame and is rotatably connected to the bed frame; One of the first mounting part and the second mounting part is fixedly connected to the bed frame, and the other is fixedly connected to the guardrail; when the second mounting part rotates relative to the first mounting part in the second rotation direction, the guardrail flips upward.

12. The hospital bed according to claim 11, characterized in that, The second mounting part has at least two first relative positions. When the second mounting part is located in one of the first relative positions, the guardrail is flush with the bed frame. When the second mounting part is located in the other first relative position, the guardrail stands above the bed frame.

13. A medical device, characterized in that, Includes the hospital bed as described in claim 11 or 12.

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