CN111297601A - Mechanical device for assisting old people in getting up and lying down - Google Patents

Abstract

The present invention provides a mechanical device for assisting the elderly to get up and down. Steering bearing; the floor is connected with the vertical plate, the bottom plate and the second end of the vertical plate are connected to form a bed body connecting part, and the bed body connecting part can be connected to the external bed body. The driving mechanism is the power source of the device, and adopts a worm gear structure. The steering of the motor is controlled to control the steering of the worm, so as to realize the whole process of turning the bed and standing up and lying down; the transmission mechanism adopts a four-bar mechanism; the one-way locking mechanism of the leg plate adopts a single bearing , The cam, the gear and the rack are meshed to achieve locking, and the rack moves under the action of the motor to make the hook hook and loosen; the support rod reset mechanism mechanically keeps the seat plate in a horizontal state during the stretching and lifting process, and drags people to lift .

Description

A mechanical device to assist the elderly to get up and down

technical field

The invention relates to the field of medical device manufacture and application, in particular to a mechanical device for assisting the elderly to get up and down.

Background technique

With the serious aging of the population in today's society and the increase in the number of elderly people, the comfort and happiness of elderly life has become a hot topic. Many elderly people live alone, and because of their generally poor physical condition, many have mobility problems.

Nursing beds, auxiliary racks, lifts, etc. have been invented on the market for the elderly who have limited mobility but have a certain self-care ability, but there are some problems. Large-scale promotion and use; although the auxiliary frame is low in cost, it has a relatively small effect and cannot solve the fundamental problem; the lift is suitable for the paralyzed elderly, and cannot provide assistance for the normal and healthy elderly, and there is no comfort at all. It is not suitable for the elderly and therefore cannot be promoted.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides an auxiliary sleeping machine, which can assist the elderly in daily life. The present invention adopts parallel four-bar linkage as a whole, is driven by a worm gear mechanism, and adopts one-way bearings, gears, racks, etc. The mechanism completes the conversion between various parts of the movement, the overall structure is relatively simple, the cost is low, the use is convenient and fast, and it is suitable for most elderly people.

To achieve the above object, the present invention provides the following technical solutions:

Specifically, the present invention provides a mechanical device for assisting the elderly to get up and down. a bottom plate; the bottom plate is connected with the vertical plate, the bottom plate is connected with the second end of the vertical plate to form a bed body connecting part, the bed body connecting part can be connected to an external bed body, and the bottom plate is provided with There is a connecting plate rotatably connected with the second end of the vertical plate, a steering bearing is arranged on the connecting plate, and a bed base is fixedly installed on the steering bearing;

The drive mechanism includes a slide rail, a worm support frame, a worm, a slider, a spline sleeve, a spline, a spline sleeve, a coupling, a turbine, a motor, a motor seat and a worm sleeve; the slide rail, the worm , spline and worm support frame are respectively provided with two, the slide rail, worm, spline are arranged in parallel, two slide rails are fixedly installed on the bed base, one slide rail is slidably installed with a slider, wherein A worm support frame is fixedly connected with the slider, and both ends of the two worms are respectively fixed on the worm support frame through a worm sleeve; the turbine wheel is arranged in the middle of the two worms, and the worm is close to the worm support connected with the slider. One end of the frame is connected with a worm gear, and the worm gear is arranged on the outer side of the worm support frame; the splines are rotatably connected with the bed frame, and the first end of each spline is fixed with a spline sleeve Each spline sleeve is connected to the output shaft of the motor through a coupling, and the motor is fixed on the bed base by means of the motor mounting seat; the spline and the worm gear are meshed and driven to make the worm move linearly to drive the worm Slider movement on the support frame;

The transmission mechanism is rotatably connected with the bed frame, and the transmission mechanism includes two back leg rods, two arm rods, two connecting rods, two oblique connecting rods, two supporting arm connecting rods and two back rods; The back leg rod is connected with the bed frame through the pin shaft in rotation, the two back leg rods are respectively connected with the first end of a connecting rod and the first end of an arm rod respectively, and the second ends of the two connecting rods are connected with each other in rotation. A back rod, the second ends of the two arm rods are respectively connected to the first end of a support arm link, and the second ends of the two support arm links are respectively connected to a back rod, and between the two back rods A first lock shaft is provided, two ends of the first lock shaft are respectively arranged at the connection between the support arm connecting rod and the back rod, and a second lock shaft is arranged between the two back leg rods. The rod, two arm rods, two connecting rods, and two supporting arm connecting rods are rotated and connected to form a parallel four-bar frame. The second end of the inclined connecting rod is connected with a slider shaft, the slider shaft is fixed on the connecting rod and is fixedly connected with the worm support frame, and moves with the rotation of the motor;

The one-way locking mechanism of the leg plate is fixedly installed on the vertical plate of the bed frame, and the one-way locking mechanism of the leg plate includes a locking frame, an angle locking frame, a first one-way bearing, a locking gear, a hook, a cam, a tooth bar, chute angle aluminum; the lock frame is fixedly installed on the vertical plate through the lock angle frame, the hook is rotatably installed on the lock frame by means of the installation shaft, and the first end of the hook is located at the first end of the Below the one-way bearing, the second end of the hook is arranged above the second lock shaft, the first one-way bearing is fixed on the lock frame by means of a bearing frame, and the lock gear and the cam are installed On the first one-way bearing, the chute angle aluminum is located directly above the lock frame and is fixedly mounted on the vertical plate, and the rack is slidably mounted on the lower part of the chute angle aluminum and is connected with the chute The slot on the angle aluminum is matched, and the rack meshes with the lock gear. When the rack slides, the rack drives the lock gear and the cam to rotate, so that the first end of the hook is pressed down to lock and unlock the second lock shaft;

The support rod reset mechanism is located above the bed base, and the support rod reset mechanism includes a seat plate, a fixed bearing seat, a bearing seat, a seat plate support rod, a top rod, a seat plate rack, a seat plate gear, and a second one-way bearing. and the seat plate cam; a fixed bearing seat and a bearing seat are respectively provided on both sides of the seat plate, the fixed bearing seat is fixedly connected to the bed seat, the bearing seat is rotatably connected with the fixed bearing seat, the top The rod is slidably installed in the middle position of the seat plate, the seat plate support rod is rotatably connected with the top rod, the upper notch of the top rod is matched with the upper cross rod of the seat plate, and the seat plate gear is connected with the groove of the seat plate. The seat plate gear and the seat plate cam are rotatably connected with the seat plate through the second one-way bearing, and the seat plate support rod, which is rotatably connected with the ejector rod, is driven to rotate by the one-way rotation of the seat plate gear and the seat plate cam, When the slider slides, the seat plate support rod can be jacked up.

Preferably, the floor is fixedly installed on the bottom of the bed or the floor indoors.

Preferably, one end of the floor is connected with the first end of the riser through a self-locking hinge.

Preferably, a front panel, a rear panel and two side panels are sequentially installed on the four side portions of the bed base.

Preferably, the connecting plate is connected with the vertical plate through a hinge.

Preferably, a circular mounting hole is provided in the middle position of the hook, the first end of the hook is provided with an arc-shaped side wall, and the second end of the hook is provided in a hook shape, when the rack travels half of the stroke When the cam is driven to press down the first end of the hook, the second end of the hook locks the second locking shaft. When the rack travels completely, the cam is driven to continue to press down the first end of the hook. When the second end of the hook is lifted upwards, the second lock shaft is unlocked.

Preferably, the motor is connected with a host controller, and the host controller can control the forward and reverse rotation of the motor and the operating frequency of the motor.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention adopts parallel four-bar linkage, driven by worm gear and worm mechanism, and uses one-way bearing, rack and pinion and other mechanisms to complete the transformation between the movements of each part. The bed frame and the main parts of each part are made of aluminum alloy frame, which is light and durable, low in cost, simple in frame, convenient for the transformation and installation of ordinary beds, and has strong adaptability.

2. The transmission mechanism of the present invention uses one mechanism to complete the two actions of assisting the elderly to sit and stand up through the transformation of the rack position of the parallel four bars; The mechanism cooperates to realize the smooth completion of multiple actions such as assisting the elderly to sit up and stand up; the one-way locking mechanism of the leg plate and the support rod reset mechanism use one-way bearings to achieve locking, and the reset device is periodically locked and reset.

3. The structure of the present invention is simple, the cost of the aluminum alloy frame is low, the use of various mechanisms reduces the power source, the application of the one-way locking and reset mechanism ensures the safety of the device, and is suitable for the elderly to use at home and factory assembly line production. .

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is one of the structural representations of the bed frame of the present invention;

Fig. 3 is one of the structural representations of the bed frame of the present invention;

Fig. 4 is the structural schematic diagram of the drive mechanism of the present invention;

Fig. 5 is the structural representation of the transmission mechanism of the present invention;

6 is a schematic structural diagram of the one-way locking mechanism of the leg plate of the present invention; and

FIG. 7 is a schematic structural diagram of the support rod reset mechanism of the present invention.

Reference number: 1-bed frame, 2-drive mechanism, 3-transmission mechanism, 4-leg plate one-way locking mechanism, 5-support rod reset mechanism, 101-vertical plate, 102-floor, 103-hinge, 104- Bottom plate, 105- Bed base, 106- Motor cover, 107- Side plate, 108- Self-locking hinge, 109- Rear plate, 110- Steering bearing, 111- Front plate, 201- Slide rail, 202- Worm support Frame, 203-worm, 204-slider, 205-spline sleeve, 206-spline, 207-spline sleeve, 208-coupling, 209-turbine, 210-motor, 211-motor seat, 212- Worm sleeve, 301-back leg rod, 302-arm rod, 303-pin shaft, 304-connecting rod, 305-inclined connecting rod, 306-slider shaft, 307-support arm connecting rod, 308-back rod, 309 -First lock shaft, 3091-Second lock shaft, 401-Lock frame, 402-Angle lock frame, 403-First one-way bearing, 404-Lock gear, 405-Hook, 406-Cam, 407-Rack, 408- Chute angle aluminum, 501- Seat plate, 502- Fixed bearing seat, 503- Bearing seat, 504- Seat plate support rod, 505- Ejector rod, 506- Seat plate rack, 507- Seat plate gear, 508- Second one-way bearing, 509-seat plate cam.

Detailed ways

Exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures denote elements with the same or similar function. While various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

Embodiments As shown in FIGS. 1 to 7 , the present invention provides a mechanical device for assisting the elderly to get up and down, including a bed frame 1 , a driving mechanism 2 , a transmission mechanism 3 , a one-way locking mechanism 4 for a leg plate, and a support rod reset mechanism 5 . , the bed frame 1 is the main part of the device, including the vertical plate 101, the floor 102, the hinge 103, the bottom plate 104, the bed base 105, the motor cover 106, the side plate 107, the self-locking page 108, the rear plate 109, the steering bearing 110 and the front panel 111; the floor 102 is fixedly installed on the bottom of the indoor bed or on the floor, and is connected with the vertical plate 101 through the self-locking hinge 108, and the hinge 103 is connected with the vertical plate 101 and the bottom plate 104, forming a fixed installation on the ordinary bed. Part, the hinge 103 is connected to a rotatable connecting plate above the fixed bottom plate 104, and the steering bearing 110 is fixedly installed on the connecting plate. 105. Four sides of the bed base 105 are sequentially installed with a front panel 111, a rear panel 109, and a side panel 107. The bed base 105 can connect the rest of the components. A schematic diagram of the main components of this patent is shown in FIG. 1 .

The drive mechanism 2 is the power source of the entire device, and the drive mechanism includes a slide rail 201, a worm support frame 202, a worm 203, a slider 204, a spline sleeve 205, a spline 206, a spline sleeve 207, a coupling 208, a turbine 209, the motor 210, the motor seat 211 and the worm sleeve 212; the slide rail 201, the worm 203, the spline 206 and the worm support frame 202 are respectively provided with two, the slide rail 201, the worm 203 and the spline 206 are arranged in parallel, and two The slide rails 201 are fixedly installed on the bed base, one of the slide rails 201 is slidably installed with a slider, one of the worm support frames 202 is fixedly connected to the slider, and the two ends of the two worms 203 pass through the worm sleeves 212 respectively. It is fixedly installed on the worm support frame 202; a turbine wheel 209 is arranged in the middle of the two worm screws 203, and one end of the worm screw close to the worm support frame 202 connected with the slider is connected with a worm gear, and the worm gear is arranged on the outside of the worm support frame 202; The bed frame is rotatably connected, the first end of each spline is fixedly connected with a spline sleeve, each spline sleeve is connected to the output shaft of the motor through a coupling, and the motor is fixed on the bed base by means of the motor mounting seat ; The spline meshes with the worm gear to drive the worm to move linearly so as to drive the slider on the worm support frame 202 to move.

The transmission mechanism 3 is rotatably connected with the bed frame, and the transmission mechanism 3 includes two back leg rods 301, two arm rods 302, two connecting rods 304, two oblique connecting rods 305, two supporting arm connecting rods 307 and two back rod 308; two back leg rods 301 are rotatably connected to the bed frame through pin shafts 303, two back leg rods 301 are respectively connected to the first end of a connecting rod and the first end of an arm rod 302, and the two The second ends of the rods are respectively connected to a back rod, the second ends of the two arm rods 302 are respectively connected to the first end of a support arm link, and the second ends of the two support arm links are respectively connected to a back rod. The back rod, a first lock shaft 309 is arranged between the two back rods, the two ends of the first lock shaft 309 are respectively arranged at the connection between the support arm link and the back rod, and between the two back leg rods 301 There is a second locking shaft 3091, two back leg rods 301, two arm rods 302, two connecting rods 305, and two supporting arm connecting rods 307 are rotatably connected to form a parallel four-bar frame, and the first end of the oblique connecting rod rotates Connected at the connection between the back leg rod 301 and the arm rod 302, the second end of the oblique connecting rod is connected with a slider shaft 306, the slider shaft 306 is fixed on the connecting rod and is fixedly connected with the worm support frame 202, and rotates with the motor And exercise.

The leg plate one-way locking mechanism 4 is fixedly installed on the vertical plate of the bed frame, and the leg plate one-way locking mechanism 4 includes a locking frame 401, an angle locking frame 402, a first one-way bearing 403, a locking gear 404, a hook 405, Cam 406, rack 407 and chute angle aluminum 408; The lock frame 401 is fixedly installed on the vertical plate through the lock angle frame 402, the hook 405 is rotatably installed on the lock frame 401 by means of the installation shaft, and the first end of the hook 405 is located in the first Below a one-way bearing 403, the second end of the hook 405 is arranged above the second locking shaft 3091, the first one-way bearing 403 is fixed on the locking frame 401 by means of a bearing frame, and the locking gear 404 and the cam 406 are installed on the first one-way bearing 401. On a one-way bearing 403, the chute angle aluminum 408 is located directly above the lock frame 401 and is fixedly installed on the vertical plate, and the rack 407 is slidably installed on the lower part of the chute angle aluminum 408 and is in line with the groove on the chute angle aluminum 408. When the rack 407 slides, the rack 407 drives the lock gear 404 and the cam 406 to rotate so that the first end of the hook 405 is pressed down to lock and unlock the second lock shaft 3091 .

The support rod reset mechanism 5 is located above the bed base, and the support rod reset mechanism 5 includes a seat plate 501, a fixed bearing seat 502, a bearing seat 503, a seat plate support rod 504, a top rod 505, a seat plate rack 506, a seat plate gear 507, The second one-way bearing 508 and the seat plate cam 509; the two sides of the seat plate 501 are respectively provided with a fixed bearing seat 502 and a bearing seat 503, the fixed bearing seat 502 is fixedly connected to the bed seat, and the bearing seat 503 is connected with the fixed bearing seat 502 is connected in rotation, the ejector rod 505 is slidably installed in the middle position of the seat plate 501, the seat plate support rod 504 is rotatably connected with the ejector bar 505, the upper notch of the ejector bar 505 is matched with the upper cross bar of the seat plate 501, and the seat plate gear 507 is connected to the upper cross bar of the seat plate 501. The notch on the seat plate is slidably fitted, and the seat plate gear 507 and the seat plate cam 509 are rotatably connected with the seat plate 501 through the second one-way bearing 508, and the one-way rotation of the seat plate gear 507 and the seat plate cam 509 pushes and rotates with the ejector rod The connected seat plate support rod 504 rotates, and when the slider 204 slides, the seat plate support rod 504 can be lifted up.

The working principle of the present invention is described below:

When the present invention is in use, first the motor 210 rotates forward, which drives the spline 206 to rotate, and the spline sleeve 205 matched with the spline 206 rotates accordingly, and the gear teeth on the worm 203 mesh with the gear teeth on the spline sleeve 205, which drives the worm 203 to rotate. , since the worm 203 is evenly distributed on both sides of the turbine 209, the turbine 209 does not move and the worm 203 moves linearly, driving the slider shaft 306 to slide, and the parallel four-bar mechanism is rotated through the oblique connecting rod 305, so that the angle between the parallel four bars becomes larger And then realize the form conversion from lying down to sitting; in the process from sitting to standing, the two motors 210 rotate in the opposite direction at the same time, which involves the transformation of the parallel four-bar frame, and the frame is initially due to the effect of human gravity. It is a seat plate, but when the machine changes to a sitting position, the first lock shaft 309 is locked with the frame. At this time, because the second lock shaft 3091 becomes a frame, the mechanical extension overcomes the human's gravity to lift the person upward. The worm gear and worm mechanism are used and matched with the rack and pinion. Through the control and driving part of the forward and reverse rotation of the motor, the two stepper motors rotate in the forward direction at the same time, and the closed-loop control of the single-chip microcomputer controls the motors, so that the turbine is subjected to the same force twice. The turbine does not rotate, so that the worm gear and worm are equivalent to the transmission of the screw nut, so that the worm moves in translation on the slide rail, so as to drive the connecting rod to drive the parallel four-bar movement to complete the conversion of the parallel four-bar angle and realize the conversion between different forms. .

When locking, a single shaft is used to place the first one-way bearing 403 and a fixed cam 406 on the lock frame 401, the first one-way bearing 403 is equipped with a locking gear 404, the locking gear 404 is meshed with the rack 407, two motors 210 At the same time, when the back leg bar 301 is rotated forward and lowered, the pressing rack 407 travels half of its stroke, and the locking gear 404 is driven to drive the shaft and the cam 406 to rotate and the pressing hook 405 locks the second locking shaft 3091. When unlocking, the two motors 210 rotate forward at the same time, press the rack 407 to travel the remaining half of the stroke, drive the lock gear 404 to drive the shaft and the cam 406 to rotate, press the hook 405 to lock the second lock shaft 3091, and release the hook 405. During the mechanical stretching and lifting process, the two motors 210 are reversed at the same time, and the slider 204 moves backwards, against the seat plate support rod 504, so that the seat plate 501 is lifted, and the seat plate 501 can always be kept in a horizontal state. The small seat plate 501 is always kept in a parallel state to fit the buttocks of the elderly. The two motors are reversed at the same time, and the slider moves backwards against the support angle aluminum of the small seat plate, so that the small seat plate is lifted, so that the small seat plate can be kept in a horizontal state all the time, dragging the person to lift.

Finally, it should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention range.

Claims (7)

1. A mechanical device for assisting the elderly to get up and down is characterized in that: it comprises a bed frame, a driving mechanism, a transmission mechanism, a one-way locking mechanism for a leg plate and a support rod reset mechanism, and the bed frame comprises a vertical plate, a floor and a a bottom plate; the bottom plate is connected with the vertical plate, the bottom plate is connected with the second end of the vertical plate to form a bed body connecting part, the bed body connecting part can be connected to an external bed body, and the bottom plate is provided with There is a connecting plate rotatably connected with the second end of the vertical plate, a steering bearing is arranged on the connecting plate, and a bed base is fixedly installed on the steering bearing; The drive mechanism includes a slide rail, a worm support frame, a worm, a slider, a spline sleeve, a spline, a spline sleeve, a coupling, a turbine, a motor, a motor seat and a worm sleeve; the slide rail, the worm , spline and worm support frame are respectively provided with two, the slide rail, worm, spline are arranged in parallel, two slide rails are fixedly installed on the bed base, one slide rail is slidably installed with a slider, wherein A worm support frame is fixedly connected with the slider, and both ends of the two worms are respectively fixed on the worm support frame through a worm sleeve; the turbine wheel is arranged in the middle of the two worms, and the worm is close to the worm support connected with the slider. One end of the frame is connected with a worm gear, and the worm gear is arranged on the outer side of the worm support frame; the splines are rotatably connected with the bed frame, and the first end of each spline is fixed with a spline sleeve Each spline sleeve is connected to the output shaft of the motor through a coupling, and the motor is fixed on the bed base by means of the motor mounting seat; the spline and the worm gear are meshed and driven to make the worm move linearly to drive the worm Slider movement on the support frame; The transmission mechanism is rotatably connected with the bed frame, and the transmission mechanism includes two back leg rods, two arm rods, two connecting rods, two oblique connecting rods, two supporting arm connecting rods and two back rods; two The back leg rod is connected with the bed frame through the pin shaft in rotation, the two back leg rods are respectively connected with the first end of a connecting rod and the first end of an arm rod respectively, and the second ends of the two connecting rods are connected with each other in rotation. A back rod, the second ends of the two arm rods are respectively connected to the first end of a support arm link, and the second ends of the two support arm links are respectively connected to a back rod, and between the two back rods A first lock shaft is provided, two ends of the first lock shaft are respectively arranged at the connection between the support arm connecting rod and the back rod, and a second lock shaft is arranged between the two back leg rods. The rod, two arm rods, two connecting rods, and two supporting arm connecting rods are rotated and connected to form a parallel four-bar frame. The second end of the inclined connecting rod is connected with a slider shaft, the slider shaft is fixed on the connecting rod and is fixedly connected with the worm support frame, and moves with the rotation of the motor; The one-way locking mechanism of the leg plate is fixedly installed on the vertical plate of the bed frame, and the one-way locking mechanism of the leg plate includes a locking frame, an angle locking frame, a first one-way bearing, a locking gear, a hook, a cam, a tooth The bar and chute angle aluminum; the lock frame is fixedly installed on the vertical plate through the lock angle frame, the hook is rotatably installed on the lock frame by means of the installation shaft, and the first end of the hook is located in the first Below the one-way bearing, the second end of the hook is arranged above the second lock shaft, the first one-way bearing is fixed on the lock frame by means of a bearing frame, and the lock gear and the cam are installed On the first one-way bearing, the chute angle aluminum is located directly above the lock frame and is fixedly mounted on the vertical plate, and the rack is slidably mounted on the lower part of the chute angle aluminum and is connected with the chute The slot on the angle aluminum is matched, and the rack is meshed with the lock gear. When the rack slides, the rack drives the lock gear and the cam to rotate, so that the first end of the hook is pressed down to lock and unlock the second lock shaft; The support rod reset mechanism is located above the bed base, and the support rod reset mechanism includes a seat plate, a fixed bearing seat, a bearing seat, a seat plate support rod, a top rod, a seat plate rack, a seat plate gear, and a second one-way bearing. and the seat plate cam; a fixed bearing seat and a bearing seat are respectively provided on both sides of the seat plate, the fixed bearing seat is fixedly connected to the bed seat, the bearing seat is rotatably connected with the fixed bearing seat, the top The rod is slidably installed in the middle position of the seat plate, the seat plate support rod is rotatably connected with the top rod, the upper notch of the top rod is matched with the upper cross rod of the seat plate, and the seat plate gear is connected with the groove of the seat plate. The seat plate gear and the seat plate cam are rotatably connected with the seat plate through the second one-way bearing, and the seat plate support rod, which is rotatably connected with the ejector rod, is pushed to rotate through the one-way rotation of the seat plate gear and the seat plate cam. When the slider slides, the seat plate support rod can be jacked up. 2 . The mechanical device for assisting the elderly to get up and down according to claim 1 , wherein the floor is fixedly installed at the bottom of an indoor bed or on the floor. 3 . 3 . The mechanical device for assisting the elderly to get up and down according to claim 2 , wherein one end of the floor is connected to the first end of the riser through a self-locking leaf. 4 . 4 . The mechanical device for assisting the elderly to get up and down according to claim 1 , wherein the four side portions of the bed base are sequentially installed with a front plate, a rear plate and two side plates. 5 . 5 . The mechanical device for assisting the elderly to get up and down according to claim 1 , wherein the connecting plate is connected to the vertical plate through a hinge. 6 . 6 . The mechanical device for assisting the elderly to get up and down according to claim 1 , wherein a circular mounting hole is provided at a middle position of the hook, an arc-shaped side wall is provided at the first end of the hook, and the hook is provided with an arc-shaped side wall. The second end of the hook is set in a hook shape. When the rack travels halfway, the cam is driven to press down the first end of the hook. At this time, the second end of the hook locks the second lock shaft. When the full stroke is completed, the cam is driven to continue to press down the first end of the hook, and the second end of the hook is lifted upward to unlock the second lock shaft. 7 . The mechanical device for assisting the elderly to get up and down according to claim 1 , wherein a host controller is connected to the motor, and the host controller can control the forward and reverse rotation of the motor and the working frequency of the motor. 8 .

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