Back lifting device

Abstract

The utility model discloses a back lifting device, and relates to the technical field of rehabilitation auxiliary instruments. Comprising a bed frame which is provided with a support; the back raising plate is arranged on the bed frame; the back plate lifting driving device is mounted on the bed frame and comprises a fixing frame, a back plate lifting device and a back plate lifting device, and the fixing frame is arranged on the support; the driving structure is mounted on the fixing frame; the connecting rod structure is hinged to the fixing frame and the lifting back plate; one end of the transmission connecting rod is hinged to the driving structure, the other end of the transmission connecting rod is hinged to the connecting rod structure, and the driving structure drives the transmission connecting rod and the connecting rod structure to drive the back lifting plate to rotate with the center point O of the hip joint of the human body as the rotation center. The connecting rod structure is driven by the driving structure, the connecting rod structure further drives the back lifting plate to rotate with the center of the hip joint of the human body as the rotating center, and the problem that when an existing back lifting device is used, the back of the human body slides relative to the back lifting plate is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rehabilitation auxiliary equipment, in particular to a back-lifting device. Background Art

[0002] At present, the medical care and nursing care for the elderly, especially those with limited mobility and lower limb disabilities, has become a social problem that must be solved. The design of devices to solve human life problems has become a hot topic of research. Among them, nursing beds, as a medical auxiliary device, are favored by more and more elderly people and disabled people. Most hospitals, nursing homes and families in China still use traditional hand-cranked nursing beds. Although there are service devices designed for the disabled in China, they cannot be developed well due to technical limitations and high prices.

[0003] When a traditional nursing bed is raised, the rotation center of the human body is different from that of the backboard, which causes a relative position slip between the back and the backboard, causing the clothes on the back to be pulled. For healthy people, they can adjust their back posture to adapt to the position of the backboard, but for patients or the elderly who cannot take care of themselves, they cannot adjust their back posture, which can easily cause danger.

[0004] Therefore, it is particularly important to develop a nursing bed back-lifting device. Utility Model Content

[0005] The utility model aims to provide a back-lifting device, which solves the problem of relative slippage between the back of a human body and a back-lifting plate when the existing back-lifting device is used.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model provides a back-lifting device, which comprises: a bed frame, wherein the bed frame is provided with a support;

[0008] A backboard, the backboard being arranged on the bed frame;

[0009] A back-lifting plate driving device is installed on the bed frame, and the back-lifting plate driving device comprises: a fixing frame, and the fixing frame is arranged on the support;

[0010] A driving structure, wherein the driving structure is mounted on the fixing frame;

[0011] A connecting rod structure, wherein the connecting rod structure is hinged to the fixing frame and is hinged to the backing plate;

[0012] A transmission connecting rod, one end of which is hinged to the driving structure, and the other end of which is hinged to the connecting rod structure, and the driving structure drives the transmission connecting rod and the connecting rod structure to drive the back plate to rotate with the center point O of the human hip joint as the rotation center.

[0013] In one embodiment of the utility model, the connecting rod structure includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, and the hinge centers among the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod and the hinge centers among the connecting rod structure and the fixing frame and the backing plate include:

[0014] A hinge center A between the first connecting rod and the fixing frame;

[0015] A hinge center C between the fourth connecting rod and the backing plate;

[0016] The hinge center E between the third connecting rod and the back plate;

[0017] A hinge center F between the second connecting rod and the fixing frame;

[0018] And at least three of the four hinge centers D between the first link and the third link, the hinge center B between the first link and the fourth link, the hinge center M between the second link and the third link, and the hinge center N between the second link and the fourth link; wherein, the center point O, the hinge center A and the hinge center F of the human hip joint are on the same straight line, quadrilateral OABC, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC are parallelograms, and at least three of them exist.

[0019] In one embodiment of the utility model, one end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B, and the two ends are hinged to one end of the third connecting rod, with the hinge center being D;

[0020] One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, and the other end is hinged to the middle of the fourth connecting rod, with the hinge center being N;

[0021] The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E;

[0022] The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C;

[0023] Among them, quadrilateral OABC, quadrilateral OADE and quadrilateral OFNC are parallelograms.

[0024] In one embodiment of the present utility model, one end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the third connecting rod, with the hinge center being D;

[0025] One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, the other end is hinged to one end of the fourth connecting rod, with the hinge center being N, and the two ends are hinged to the third connecting rod, with the hinge center being M;

[0026] The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E;

[0027] The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C;

[0028] Among them, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC are parallelograms.

[0029] In one embodiment of the utility model, one end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B, and the two ends are hinged to one end of the third connecting rod, with the hinge center being D;

[0030] One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, and the other end is hinged to the middle of the third connecting rod, with the hinge center being M;

[0031] The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E;

[0032] The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C;

[0033] Among them, quadrilateral OABC, quadrilateral OADE and quadrilateral OFME are parallelograms.

[0034] In one embodiment of the utility model, one end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B;

[0035] One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, and the other end is hinged to the middle of the fourth connecting rod, with the hinge center being N, and the two ends are hinged to one end of the third connecting rod, with the hinge center being M;

[0036] The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E;

[0037] The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C;

[0038] Among them, quadrilateral OABC, quadrilateral OFME and quadrilateral OFNC are parallelograms.

[0039] In one embodiment of the present invention, one end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B, and the two ends are hinged to the third connecting rod, with the hinge center being D;

[0040] One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, the other end is hinged to one end of the fourth connecting rod, with the hinge center being N, and the two ends are hinged to the third connecting rod, with the hinge center being M;

[0041] The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E;

[0042] The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C;

[0043] Among them, quadrilateral OABC, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC are parallelograms.

[0044] In one embodiment of the present invention, the driving structure comprises:

[0045] A first sliding guide rail, the sliding guide rail is fixedly connected to the fixing frame;

[0046] A slider is slidably connected to the first sliding guide rail, and one end of the transmission connecting rod is hinged to the slider, and the other end is hinged to the first connecting rod.

[0047] In one embodiment of the utility model, the driving structure also includes a first screw rod and a handle, the first screw rod is rotatably connected to the fixed frame, and one end of the first screw rod is fixedly connected to the handle, and the slider is connected to the first screw rod via a spiral pair.

[0048] In one embodiment of the present invention, the backing plate comprises:

[0049] Main lifting back plate;

[0050] A connecting member, the connecting member is arranged on the bottom surface of the main back plate;

[0051] At least one sub-back plate is fixedly connected to the connecting member and is located on one side of the main back plate.

[0052] The utility model drives the connecting rod structure through the driving structure, and the connecting rod structure further drives the back lifting plate to rotate with the center of the human hip joint as the rotation center, thereby solving the problem of relative slippage between the human back and the back lifting plate when the existing back lifting device is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0054] Figure 1 It is a structural schematic diagram of the lifting device in the lifting state in the first embodiment of the present application.

[0055] Figure 2 This is a schematic structural diagram of the lifting device in the first embodiment of the present application when the lifting device is not in the lifting state.

[0056] Figure 3 This is a schematic diagram of the relative relationship between the bed frame and the support in Example 1 of the present application.

[0057] Figure 4 This is a schematic diagram of the position of the first sliding guide rail in Example 1 of the present application.

[0058] Figure 5 This is a schematic diagram of the design principle of the connecting rod structure in Example 1 of the present application.

[0059] Figure 6 This is a schematic diagram of the structure of the connecting rod structure in the second embodiment of the present application.

[0060] Figure 7 This is a schematic diagram of the design principle of the connecting rod structure in Example 2 of the present application.

[0061] Figure 8 This is a schematic diagram of the structure of the connecting rod structure in Example 3 of the present application.

[0062] Fig. 9 This is a schematic diagram of the design principle of the connecting rod structure in Example 3 of the present application.

[0063] Fig.10 This is a schematic structural diagram of the connecting rod structure in the fourth embodiment of the present application.

[0064] Fig.11 This is a schematic diagram of the design principle of the connecting rod structure in Example 4 of the present application.

[0065] Fig.12 This is a schematic structural diagram of the connecting rod structure in Example 5 of the present application.

[0066] Fig.13 This is a schematic diagram of the design principle of the connecting rod structure in Example 5 of the present application.

[0067] Fig.14 It is a schematic structural diagram of a back plate in an exemplary embodiment of the present application.

[0068] Fig.15 It is a schematic diagram of the structural relationship between the connecting member, the sub-lifting back plate and the main lift back plate in the exemplary embodiment of the present application.

[0069] Fig.16 It is a schematic structural diagram of a connecting member in an exemplary embodiment of the present application.

[0070] Fig.17 It is a schematic structural diagram of a fixing frame in an exemplary embodiment of the present application.

[0071] Fig.18 It is a schematic diagram of the position of the second screw in the exemplary embodiment of the present application.

[0072] Description of Figure Numbers:

[0073] 1. Bed frame; 11. Support; 12. Bed board; 121. Limit block; 2. Lifting board; 21. Main lifting board; 211. Slide rail; 22. Sub-lifting board; 221. First sub-lifting board; 222. Second sub-lifting board; 23. Connecting piece; 231. Protruding structure; V1. First connecting hole; V2. Second connecting hole; V3. Third connecting hole; 3. Lifting board driving device; 31. Fixed frame; 32. Driving structure; 33. Connecting rod structure; 34. Transmission connecting rod; 323. First screw rod; 324. First handle; 321. Sliding block; 325. Fixed block; 322. First sliding guide rail; 331. First connecting rod; 332. Second connecting rod; 333. Third connecting rod; 334. Fourth connecting rod; 111. Second sliding guide rail; 311. Second screw rod; 312. Second handle. DETAILED DESCRIPTION

[0074] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0075] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0076] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] See also Figure 1 As shown, the utility model provides a back-lifting device to solve the problems of back-pulling and slipping caused by relative displacement between the back-lifting device and the back of the human body in the prior art, and the problem that the back-lifting device is not suitable for users of different heights. Specifically, the back-lifting device includes: a bed frame 1, a back-lifting board 2 and a back-lifting board driving device 3, the bed frame 1 is provided with a support 11 and a bed board 12, the back-lifting board 2 is installed on one side of the bed board 12; the back-lifting board driving device 3 is installed on the bed frame 1, including a fixed frame 31, a driving structure 32, a connecting rod structure 33 and a transmission connecting rod 34, the fixed frame 31 is provided on the support 11; the driving structure 32 is installed at the bottom of the fixed frame 31; the connecting rod structure 33 is hinged to the fixed frame 31, and is hinged to the back-lifting board 2; one end of the transmission connecting rod 34 is hinged to the driving structure 32, and the other end is hinged to the connecting rod structure 33. The driving structure 32 drives the connecting rod structure 33 through the transmission connecting rod 34, and the connecting rod structure 33 drives the back plate 2 to rotate with the center point O of the human hip joint as the rotation center.

[0078] It should be understood that the process of a human body from lying down to sitting up or from sitting to lying down can be approximated as a rotational movement of the upper body with the hip joint as the rotation center. Therefore, the utility model achieves the anti-slip effect by setting the rotation center of the backrest at the center position of the human hip joint. In order to better explain the working principle and design principle of this application, the center point position of the human body's hip joint when lying down normally is defined as the center point O of the human body's hip joint.

[0079] See also Figure 1-3As shown, in an exemplary embodiment of the present application, the support 11 is arranged on a horizontal plane of the bed frame 1 near the bed foot, and the support 11 is connected to the four bed feet of the bed frame 1, which can make the structure of the bed frame 1 more stable and avoid shaking, and at the same time make the force on the support 11 more uniform. A limit block 121 is arranged at the bottom of the bed board 12, and the limit block 121 is located at the center of the width direction of the lower limb bed part of the bed frame 1 to limit the horizontal position of the fixing frame 31.

[0080] See also Figure 1-4 As shown, the driving structure 32 is arranged at the bottom of the fixing frame 31, and the driving structure 32 includes a slider 321, a first sliding guide rail 322, a first screw rod 323, a first handle 324 and a fixing block 325. The first sliding guide rail 322 is fixedly connected to the fixing frame 31, and the slider 321 is installed in the first sliding guide rail 322. The fixing block 325 is arranged on the support 11 close to the back plate 2, and together with the limit block 121, the sliding range of the fixing frame 31 is limited; the first screw rod 323, a first handle 324 and a fixing block 325; the first sliding guide rail 322 is fixedly connected to the fixing frame 31, and the slider 321 is installed in the first sliding guide rail 322. The fixing block 325 is arranged on the support 11 close to the back plate 2. The two ends of the rod 323 are rotatably connected to the fixing frame 31 and the fixing block 325 respectively. The first handle 324 is connected to one end of the first screw rod 323 close to the fixing block 325 and is located on the side of the fixing block 325 away from the limit block 121. The first screw rod 323 is connected to the slider 321 through a screw pair. When the first handle 324 is shaken, the first handle 324 drives the first screw rod 323 to rotate, and the first screw rod 323 drives the slider 321 to move horizontally in the first sliding guide rail 322. The slider 321 is connected to the connecting rod structure 33 through the transmission connecting rod 34. Specifically, one end of the transmission connecting rod 34 is hinged to the first connecting rod of the connecting rod structure 33 described below, and the other end is hinged to the slider 321, so that when the slider 321 moves, the connecting rod structure 33 can be driven to move.

[0081] See also Figure 1-5 As shown, the following embodiment 1 is taken as an example, and the design principle and setting method of the hinge center when the first connecting rod 331 and the third connecting rod 333 are hinged in the connecting rod structure 33 in some embodiments of the present application are explained in detail in combination with the contents of the drawings.

[0082] The connecting rod structure 33 includes a first connecting rod 331, a second connecting rod 332, a third connecting rod 333 and a fourth connecting rod 334. In order to make the back-lifting plate 2 rotate with the center point O of the human hip joint as the rotation center, it is necessary to make the hinge center E and the hinge center C rotate with the center point O of the human hip joint as the rotation center. Therefore, in the present application, the hinge centers between the first connecting rod 331, the second connecting rod 332, the third connecting rod 333 and the fourth connecting rod 334 and the hinge centers between the connecting rod structure 33 and the fixing frame 31 and the back-lifting plate 2 need to include: the hinge center A between the first connecting rod 331 and the fixing frame 31; the hinge center C between the fourth connecting rod 334 and the back-lifting plate 2; the hinge center E between the third connecting rod 333 and the back-lifting plate 2; the hinge center F between the second connecting rod 332 and the fixing frame 31; and the hinge center D between the first connecting rod 331 and the third connecting rod 333, the hinge center C between the fourth connecting rod 334 and the back-lifting plate 2; At least three of the hinge center B between the first link 331 and the fourth link 334, the hinge center M between the second link 332 and the third link 333, and the hinge center N between the second link 332 and the fourth link 334, the center point O of the human hip joint, the hinge center F and the hinge center A are located on the same straight line, and the quadrilateral OABC, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC formed by each hinge center are parallelograms, and at least three of them exist to ensure that the hinge center E and the hinge center C both rotate around the center point O of the human hip joint as the rotation center.

[0083] In embodiment one, the hinge centers among the first link 331, the second link 332, the third link 333 and the fourth link 334 and the hinge centers between the link structure 33 and the fixed frame 31 and the back plate 2 include the hinge center A, hinge center C, hinge center E, hinge center F, hinge center D, hinge center B and hinge center N described in the above embodiments, and the parallelograms formed by the hinge centers include the quadrilateral OABC, quadrilateral OADE and quadrilateral OFNC in the above embodiments.

[0084] Specifically, in Example 1, one end of the first connecting rod 331 is hinged to the fixed frame 31, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod 334, with the hinge center being B, and the two ends are hinged to one end of the third connecting rod 333, with the hinge center being D; one end of the second connecting rod 332 is hinged to the fixed frame 31, with the hinge center being F, and the other end is hinged to the middle part of the fourth connecting rod 334, with the hinge center being N; the other end of the third connecting rod 333 is hinged to the back plate 2, with the hinge center being E; the other end of the fourth connecting rod 334 is hinged to the back plate 2, with the hinge center being C.

[0085] According to the above setting method, the rotation center of the back-lifting device can be controlled at the center point O of the human hip joint, thereby achieving an anti-slip effect.

[0086] See also Figure 6-7 As shown, in embodiment two, the hinge centers among the first link 331, the second link 332, the third link 333 and the fourth link 334 and the hinge centers between the link structure 33 and the fixing frame 31 and the back plate 2 include the hinge center A, hinge center C, hinge center E, hinge center F, hinge center D, hinge center M and hinge center N described in the above embodiments, and the parallelograms formed by the hinge centers include quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC in the above embodiments.

[0087] Specifically, in Example 2, one end of the first connecting rod 331 is hinged to the fixed frame 31, with the hinge center being A, and the other end is hinged to one end of the third connecting rod 333, with the hinge center being D; one end of the second connecting rod 332 is hinged to the fixed frame 31, with the hinge center being F, and the other end is hinged to one end of the fourth connecting rod 334, with the hinge center being N, and both ends are hinged to the third connecting rod 333, with the hinge center being M; the other end of the third connecting rod 333 is hinged to the back plate 2, with the hinge center being E; the other end of the fourth connecting rod 334 is hinged to the back plate 2, with the hinge center being C.

[0088] See also Figure 8-9 As shown, in embodiment three, the hinge centers among the first link 331, the second link 332, the third link 333 and the fourth link 334 and the hinge centers between the link structure 33 and the fixing frame 31 and the back plate 2 include the hinge center A, hinge center C, hinge center E, hinge center F, hinge center D, hinge center B and hinge center M described in the above embodiments, and the parallelograms formed by the hinge centers include quadrilateral OABC, quadrilateral OADE and quadrilateral OFME in the above embodiments.

[0089] Specifically, in Example 3, one end of the first connecting rod 331 is hinged to the fixed frame 31, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod 334, with the hinge center being B, and the two ends are hinged to one end of the third connecting rod 333, with the hinge center being D; one end of the second connecting rod 332 is hinged to the fixed frame 31, with the hinge center being F, and the other end is hinged to the middle part of the third connecting rod 333, with the hinge center being M; the other end of the third connecting rod 333 is hinged to the back plate 2, with the hinge center being E; the other end of the fourth connecting rod 334 is hinged to the back plate 2, with the hinge center being C.

[0090] See also Figure 10-11 As shown, in embodiment four, the hinge centers among the first link 331, the second link 332, the third link 333 and the fourth link 334 and the hinge centers between the link structure 33 and the fixing frame 31 and the back plate 2 include the hinge center A, hinge center C, hinge center E, hinge center F, hinge center B, hinge center M and hinge center N described in the above embodiments, and the parallelograms formed by the hinge centers include quadrilateral OABC, quadrilateral OFME and quadrilateral OFNC in the above embodiments.

[0091] Specifically, in Example 4, one end of the first connecting rod 331 is hinged to the fixed frame 31, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod 334, with the hinge center being B; one end of the second connecting rod 332 is hinged to the fixed frame 31, with the hinge center being F, and the other end is hinged to the middle part of the fourth connecting rod 334, with the hinge center being N, and both ends thereof are hinged to one end of the third connecting rod 333, with the hinge center being M; the other end of the third connecting rod 333 is hinged to the back plate 2, with the hinge center being E; the other end of the fourth connecting rod 334 is hinged to the back plate 2, with the hinge center being C.

[0092] See also Figure 12-13 As shown, in embodiment five, the hinge centers among the first link 331, the second link 332, the third link 333 and the fourth link 334 and the hinge centers between the link structure 33 and the fixing frame 31 and the back plate 2 include the hinge center A, hinge center C, hinge center E, hinge center F, hinge center B, hinge center D, hinge center M and hinge center N described in the above embodiments, and the parallelograms formed by the hinge centers include quadrilateral OABC, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC in the above embodiments.

[0093] Specifically, in Example 5, one end of the first connecting rod 331 is hinged to the fixed frame 31, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod 334, with the hinge center being B, and the two ends thereof are hinged to the third connecting rod 333, with the hinge center being D; one end of the second connecting rod 332 is hinged to the fixed frame 31, with the hinge center being F, and the other end is hinged to one end of the fourth connecting rod 334, with the hinge center being N, and the two ends thereof are hinged to the third connecting rod 333, with the hinge center being M; the other end of the third connecting rod 333 is hinged to the back plate, with the hinge center being E; the other end of the fourth connecting rod 334 is hinged to the back plate, with the hinge center being C.

[0094] It should be noted that, in the above embodiment, the positions of the hinge center D between the first link 331 and the third link 333, and the hinge center M between the second link 332 and the third link 333 are not in the axial direction of the corresponding links. Therefore, the first link 331 and the second link 332 need to be adaptively extended according to the positions of the hinge centers.

[0095] It should be noted that in the exemplary embodiment of the present application, the connecting rod structure 33 and the transmission connecting rod 34 are symmetrically arranged on both sides of the fixing frame 31 and the slider 321 along the width direction of the bed frame 1 to maintain the balance and stability of the backrest 2 and avoid tilting or shaking caused by uneven force. The above embodiment only describes the connecting rod structure 33 and the transmission connecting rod 34 on one side, and it should be understood that the same structure is symmetrically arranged on the other side opposite thereto.

[0096] See also Figure 14-16 As shown, in an exemplary embodiment of the present application, the lifting board 2 includes a main lifting board 21, at least one sub-lifting board 22 and a connecting member 23, and the connecting member 23 is slidably installed at the bottom of the main lifting board 21; the sub-lifting board 22 is installed on the connecting member 23 and is located on one side of the main lifting board 21; the lifting board driving device 3 is arranged on the support 11 and is connected to the connecting member 23.

[0097] The main lifting plate 21 is provided with a slide rail 211 at the bottom, and the connecting member 23 is slidably installed in the slide rail 211. The connecting member 23 slides along the slide rail 211 to change the length of the connecting member 23 protruding from the main lifting plate 21, so as to facilitate the installation of different numbers of sub-lifting plates 22 to change the total length of the lifting plate 2 to adapt to different users. For example, in this embodiment, the number of the sub-lifting plates 22 can be set to one, two, three, four or other numbers, which can be adjusted as needed.

[0098] In an exemplary embodiment of the present application, the one of the multiple sub-lifting back plates 22 that is farthest from the main lifting plate 21 is defined as a first sub-lifting back plate 221, and the remaining sub-lifting back plates located between the first sub-lifting back plate 221 and the main lifting back plate 21 are defined as second sub-lifting back plates 222. The first sub-lifting back plate 221 is fixedly connected to the connecting member 23, and the second sub-lifting back plate 222 is sleeved on the connecting member 23, or is detachably connected to the connecting member 23, so as to facilitate changing the number of the sub-lifting back plates 22, thereby adjusting the overall length of the lifting plate 2.

[0099] See also Figure 15-16As shown, in an exemplary embodiment of the present application, a sliding sleeve structure is provided at the bottom of the sub-lifting plate 22, and fixing holes are provided on both sides of the sliding sleeve structure; a first connecting hole V1 is provided at one end of the connecting member 23, and a pin is passed through the fixing hole of the first sub-lifting plate 221 and the first connecting hole V1 to fix the first sub-lifting plate 221 to the connecting member 23. The second sub-lifting plate 222 is sleeved on the connecting member through the sliding sleeve structure. Specifically, when the sub-lifting plate is installed, the connecting member 23 passes through the second sub-lifting plate 222 and the first sub-lifting plate 221 in sequence, and is finally connected to the first sub-lifting plate 221. The second sub-lifting plate 222 is fixed to the connecting member 23 through the limiting effect of the first sub-lifting plate 221 and the main lifting plate 21.

[0100] In an exemplary embodiment of the present application, the connecting rod structure 33 is connected to the connecting member 23, and the connecting member 23 is also provided with a second connecting hole V2 and a third connecting hole V3. The second connecting hole V2 is arranged at one end of the connecting member 23 away from the first connecting hole V1, and the third connecting hole V3 is located between the first connecting hole V1 and the second connecting hole V2. Correspondingly, openings are provided on both sides of the slide rail 211, which can pass through the opening and the second connecting hole V2 on the connecting member 23 through a pin shaft, and be hinged to the fourth connecting rod 334 in the above-mentioned connecting rod structure 33, and pass through the opening and the third connecting hole V3 on the connecting member 23 through another pin shaft, and be hinged to the third connecting rod 333 in the above-mentioned connecting rod structure 33.

[0101] It should be noted that, in the present application, multiple connection holes may be provided between the first connection hole V1 and the third connection hole V3, and the second sub-backing plate 222 may be fixed in the above manner. Of course, in other embodiments, the connection method between the sub-backing plate 22 and the connecting member 23 may be other detachable connection methods other than the above method, such as bolt connection, key connection, or spline connection, etc.

[0102] See also Fig.14 and 17 As shown, in an exemplary embodiment of the present application, a second sliding guide rail 111 is provided on the support 11, the fixed frame 31 is slidably connected to the second sliding guide rail 111, and the two ends of the second screw rod 311 are respectively rotatably connected to the limit block 121 and the bed frame 1, extending along the length direction of the bed frame 1, and the end of the second screw rod 311 connected to the bed frame 1 is fixedly connected to the second handle 312, and the second screw rod 311 is connected to the fixed frame 31 through a screw pair. Rotating the second handle 312 can drive the fixed frame 31 to slide in the second sliding guide rail 111, and then drive the connecting member 23 to slide in the sliding rail 211, by changing the position of the connecting member 23.

[0103] It should be noted that, in other embodiments, the device for driving the first screw rod 323 and / or the second screw rod 311 may also be other structures or devices, such as using a motor to drive the first screw rod 323 and / or the second screw rod 311.

[0104] See also Fig.18 As shown, the fixing frame 31 is provided with a hollow 313, and the side of the connecting member 23 facing away from the back-lifting plate 2 is provided with a protruding structure 231, and the protruding structure 231 matches the hollow 313 of the fixing frame 31. When the back is not lifted, and the first connecting hole V1 of the connecting member 23 is not connected to the sub-back-lifting plate 22, since the hollow 313 of the fixing frame 31 is engaged with the protruding structure 231 of the connecting member 23, of course, in other embodiments, the hollow 313 can also be set as a groove, and the connecting rod structure 33 is hinged with the connecting member 23, rotating the second handle 312 can drive the fixing frame 31 to slide in the second sliding guide rail 111, and then drive the connecting member 23 to slide in the slide rail 211, and by changing the position of the connecting member 23, the fixing hole of the sub-back-lifting plate 22 and the first connecting hole V1 of the connecting member are aligned, and then the connection of the connecting member 23 and the sub-back-lifting plate 22 is completed through structures such as pins or bolts. By changing the number of the sub-back plates 22 connected to the connecting member 23, the size of the back plate 2 can be adjusted.

[0105] It should be noted that in the present application, the sub-backboard 22 that is not connected to the connecting member 23 can be installed at a position of the bed frame 1 close to the bed board 12 and used as an extension of the bed board 12. Compared with the traditional detachable structure, there is no need to store the disassembled parts separately.

[0106] In summary, the present application drives the first screw 323 to rotate around the axis by rotating the first handle 324, and further drives the connecting rod structure 33 to control the back-lifting plate 2 to rotate with the center of the human hip joint as the rotation center, so that there is no relative displacement between the human back and the back-lifting plate 2 during the back-lifting process, which solves the problems of pulling the back or slipping caused by the relative displacement between the human back and the back-lifting plate 2 when the existing nursing bed back-lifting device is lifted. In addition, the present application also realizes the adjustable size of the back-lifting plate 2 by setting a detachable sub-back-lifting plate 22 to cooperate with the main back-lifting plate 21, which solves the problem of the back-lifting plate being unsuitable due to the height difference of different users.

[0107] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the concept of the utility model, such as a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0108] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the other technical features will not be described in detail here.

Claims

1. A back-lifting device, characterized in that: include: A bed frame, the bed frame being provided with a support and a bed board; A backing plate, the backing plate is installed on one side of the bed board; A back-lifting plate driving device is installed on the bed frame, and the back-lifting plate driving device comprises: a fixing frame, and the fixing frame is arranged on the support; A driving structure, wherein the driving structure is mounted on the fixing frame; A connecting rod structure, wherein the connecting rod structure is hinged to the fixing frame and is hinged to the backing plate; A transmission connecting rod, one end of which is hinged to the driving structure, and the other end of which is hinged to the connecting rod structure, and the driving structure drives the transmission connecting rod and the connecting rod structure to drive the back plate to rotate with the center point O of the human hip joint as the rotation center.

2. The back lifting device according to claim 1, characterized in that: The connecting rod structure includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, and the hinge centers among the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod and the hinge centers among the connecting rod structure and the fixing frame and the backing plate include: A hinge center A between the first connecting rod and the fixing frame; A hinge center C between the fourth connecting rod and the backing plate; The hinge center E between the third connecting rod and the back plate; A hinge center F between the second connecting rod and the fixing frame; And at least three of the four hinge centers D between the first link and the third link, the hinge center B between the first link and the fourth link, the hinge center M between the second link and the third link, and the hinge center N between the second link and the fourth link; wherein, the center point O, the hinge center A and the hinge center F of the human hip joint are on the same straight line, quadrilateral OABC, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC are parallelograms, and at least three of them exist.

3. The back lifting device according to claim 2, characterized in that: One end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B, and the two ends are hinged to one end of the third connecting rod, with the hinge center being D; One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, and the other end is hinged to the middle of the fourth connecting rod, with the hinge center being N; The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E; The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C; Among them, quadrilateral OABC, quadrilateral OADE and quadrilateral OFNC are parallelograms.

4. The back-lifting device according to claim 2, characterized in that: One end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the third connecting rod, with the hinge center being D; One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, the other end is hinged to one end of the fourth connecting rod, with the hinge center being N, and the two ends are hinged to the third connecting rod, with the hinge center being M; The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E; The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C; Among them, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC are parallelograms.

5. The back-lifting device according to claim 2, characterized in that: One end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B, and the two ends are hinged to one end of the third connecting rod, with the hinge center being D; One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, and the other end is hinged to the middle of the third connecting rod, with the hinge center being M; The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E; The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C; Among them, quadrilateral OABC, quadrilateral OADE and quadrilateral OFME are parallelograms.

6. The back lifting device according to claim 2, characterized in that: One end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, and the other end is hinged to one end of the fourth connecting rod, with the hinge center being B; One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, and the other end is hinged to the middle of the fourth connecting rod, with the hinge center being N, and the two ends are hinged to one end of the third connecting rod, with the hinge center being M; The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E; The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C; Among them, quadrilateral OABC, quadrilateral OFME and quadrilateral OFNC are parallelograms.

7. The back-lifting device according to claim 2, characterized in that: One end of the first connecting rod is hinged to the fixing frame, with the hinge center being A, the other end is hinged to one end of the fourth connecting rod, with the hinge center being B, and the two ends are hinged to the third connecting rod, with the hinge center being D; One end of the second connecting rod is hinged to the fixing frame, with the hinge center being F, the other end is hinged to one end of the fourth connecting rod, with the hinge center being N, and the two ends are hinged to the third connecting rod, with the hinge center being M; The other end of the third connecting rod is hinged to the backing plate, and the hinge center is E; The other end of the fourth connecting rod is hinged to the backing plate, and the hinge center is C; Among them, quadrilateral OABC, quadrilateral OADE, quadrilateral OFME and quadrilateral OFNC are parallelograms.

8. The back-lifting device according to claim 2, characterized in that: The driving structure comprises: A first sliding guide rail, the sliding guide rail is fixedly connected to the fixing frame; A slider is slidably connected to the first sliding guide rail, and one end of the transmission connecting rod is hinged to the slider, and the other end is hinged to the first connecting rod.

9. The back-lifting device according to claim 8, characterized in that: The driving structure also includes a first screw rod and a handle. The first screw rod is rotatably connected to the fixing frame, and one end of the first screw rod is fixedly connected to the handle. The slider is connected to the first screw rod via a screw pair.

10. The back lifting device according to claim 1, characterized in that: The backing plate comprises: Main lifting back plate; A connecting member, the connecting member is arranged on the bottom surface of the main back plate; At least one sub-back plate is fixedly connected to the connecting member and is located on one side of the main back plate.

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