CN110151044A - An assisting device for sitting and getting up - Google Patents

Abstract

The invention relates to an assisting device for getting up from a toilet, which comprises a seat board with a toilet hole in the middle, a lifting mechanism for supporting the seat board is arranged below the seat board, and an angle adjustment mechanism for the seat board. The seat plate angle adjustment mechanism is connected with the cushion plate to drive the cushion plate to tilt forward or reset, the cushion plate is hinged with the lifting mechanism, and the cushion plate angle adjustment mechanism drives the cushion plate to tilt forward The buttocks of the elderly can lean against the cushion board when they are in a standing state so that they can sit down or stand up. The present invention only relies on the translational movement of the original moving part to realize the different motion states of the follower, that is, the rising and tilting stages of the seat board, and the rising and falling states of the foldable pedals. The utility model can effectively prevent the old people from being out of balance when they sit down and cause danger and make the old people stand up easily after sitting down.

Description

An assisting device for sitting and getting up

technical field

The invention relates to the field of daily necessities, in particular to an assisting device for getting up from the toilet.

Background technique

With the serious aging of the domestic population, more and more problems in the life of the elderly are beginning to appear day by day, and it is a necessary activity for the elderly to sit at home alone. As the elderly grow older, common calcium loss, muscle weakness, degenerative arthritis, lumbar and cervical spine lesions, etc. will cause the elderly to be unable to stand up again or have difficulty getting up after sitting down. When sitting in the toilet, the contact area between the buttocks and the toilet is small, which can easily lead to poor circulation of blood, making it more difficult to get up after sitting for a long time; in severe cases, it may even be impossible to sit normally, prone to sudden falls and other accidents. The occurrence of the situation has seriously affected the safety of sitting in the toilet. However, the existing toilets for the elderly and the disabled are only equipped with handrails on both sides. The elderly or disabled still need to rely on the strength of their own arms to assist them to sit down or stand up. In some postures, the force cannot be effectively exerted.

Studies have shown that when going to the toilet, the squatting posture is more scientific than the sitting posture, and can defecate more easily, and at the same time relieve constipation. When squatting, the anorectal angle is about 80-90 degrees. When squatting, the anorectal angle can reach 100-110 degrees. In addition, when squatting, the abdominal pressure is high, which can promote defecation, especially for people with cardiovascular and cerebrovascular diseases. It can reduce the chance of accidents, and the elderly and children who are relatively weak in physical strength mostly use sitting posture to defecate because the traditional squatting defecation puts a lot of force on the legs and knees when squatting, which is prone to slipping, fractures and other accidents.

Contents of the invention

The present invention designs an assisting device for sitting and getting up, which solves the technical problem that the existing toilets for helping the elderly and the disabled need to rely on arm strength to sit down or get up, and some assisting devices that are not well designed and installed are prone to cause the user to be in some postures. Situations where you cannot exert force effectively and are inconvenient to get up or sit down.

In order to solve the above-mentioned technical problems, the present invention adopts the following scheme:

An assisting device for getting up from the toilet, comprising a seat board (1) with a toilet hole in the middle, and a lifting mechanism for supporting the seat board (1) is arranged under the seat board (1), and is characterized in that: It includes a seat board angle adjustment mechanism, the seat board angle adjustment mechanism is connected with the seat board (1), and is used to drive the seat board (1) to tilt forward or reset, and the seat board (1) is connected to the seat board (1) The lifting mechanism is hinged, and the cushion plate angle adjustment mechanism drives the cushion plate (1) to tilt forward so that the buttocks of the elderly can lean on the cushion plate (1) when they are standing, so as to sit down or stand up.

Furthermore, the angle adjustment mechanism of the cushion board includes a slanting rod (2) and an angle adjustment driving device, the upper end of the slanting rod (2) is linked with the rear end of the cushion board (1), and the slanting rod (2) The lower end of the angle adjustment drive device is hinged, and the angle adjustment drive device pushes the lower end displacement of the diagonal rod (2) to drive the upper end of the diagonal rod (2) to push the rear end of the cushion board (1). High or reset, so that the cushion board (1) is tilted forward or reset.

Further, the lifting mechanism includes a left scissor-type fork frame, a right scissor-type fork frame and a lifting drive device, and the lifting drive device is connected with one end below the left scissor-type fork frame and the right scissor-type fork frame, and uses To change the respective articulation angles of the left scissor-type yoke and the right scissor-type yoke, thereby raising or lowering the cushion board arranged on the left scissor-type yoke and the right scissor-type yoke (1).

Further, the angle adjustment driving device and the lifting driving device are the same power device, and the lower end of the inclined rod (2) is linked with the upper end of the lifting mechanism through a transmission mechanism; the transmission mechanism includes a transmission rod (3) , the front end of the transmission rod (3) is connected to the upper rear end of the left scissor-type fork frame or the right scissor-type fork frame, and the rear end of the transmission rod (3) is provided with a long slot hole (4), The lower end of the oblique rod (2) is provided with a pin (5), and the pin (5) is inserted in the slotted hole (4) and can move back and forth in the slotted hole (4). The upper rear end of the left scissor-type fork or the right scissor-type fork moves forward to drive the long slot (4) on the transmission rod (3) forward until the end of the long slot (4) The rear groove wall is in contact with the bolt (5), at this time, the transmission rod (3) drives the lower end of the inclined rod (2) to move forward, thereby driving the upper end of the inclined rod (2) to push the The rear end of the cushion board (1) is moved upward, so that the cushion board (1) is inclined forward.

Further, the power device includes a left linear motor (6) and a right linear motor (7), the left linear motor (6) is hinged to the lower end of the left scissor-type fork, and is used to push the left scissor-type The fork frame is raised or lowered, and the right linear motor (7) is hinged to the lower end of the right scissor-shaped fork frame, and is used to push the right scissor-shaped fork frame to rise or lower.

Further, it also includes a base (10), the left scissor-type fork frame and the right scissor-type fork frame are respectively hinged by the first support rod (8) and the second support rod (9) in an X shape, wherein the The lower end of the first support rod (8) is hinged to the base (10), the lower end of the second support rod (9) is hinged and slidably connected to the base (10), and the left linear motor (6 ) and the right linear motor (7) are respectively connected to the lower end of the second support rod (9) on the same side, and the upper ends of the first support rod (8) and the second support rod (9) pass through The connecting crossbar (11) is connected, the upper end of the second supporting rod (9) is hinged with one end of the connecting crossbar (11), the upper end of the first supporting rod (8) is connected with the connecting crossbar ( 11) Hinged and slidable connection.

Further, the lower end of the second support rod (9) is hinged to the first trolley (12), and the base (10) is provided with a The first sliding rail that slides back and forth, the upper end of the first support rod (8) is hinged with the second trolley (13), and the connecting cross bar (11) is provided with a The second slide rail on which the second pulley (13) slides back and forth, and a third pulley (14) is also arranged in the second slide rail, and the third pulley (14) is connected to the diagonal rod (2) The lower end is hinged by the bolt (5), and the third pulley (14) is provided with a through hole for the bolt (5) to pass through.

Further, a height-adjustable armrest (16) is arranged on both sides of the cushion board (1), and an armrest pole (18) is arranged below the height-adjustable armrest (16), and the armrest pole (18) ) is provided with a ratchet, the seat board (1) is provided with an armrest fixing base (17), and the armrest fixing base (17) is provided with a buckle that cooperates with the ratchet for locking, The height-adjustable armrest (16) is also provided with a release device for unlocking the buckle and the ratchet.

Further, the height-adjustable armrest (16) is also provided with a handle, and the handle is hinged with the height-adjustable armrest (16), so that the elderly can hold the handle to Balance or leverage.

Further, the front side of the base (10) is also provided with a foldable pedal (15), the upper end of the foldable pedal (15) is connected with the left linear motor (6) and/or the right linear motor The drive shaft of (7) is linked by a rope, and the drive shaft of the left linear motor (6) and/or the right linear motor (7) pushes the lower end of the second support rod (9) to move forward or backward At the same time, the rope can be tightened or loosened so that the foldable footrest (15) can be unfolded and raised or folded and lowered.

The assisting device for getting up from the toilet has the following beneficial effects:

(1) The seat plate of the toilet seat and rising assisting device of the present invention can also be tilted forward or reset while rising and falling. The user only needs to lean on the seat plate in the lifted state in an almost standing state, and the hands will naturally Placed on the armrests on both sides, press the button on the armrests to lower the cushion, provide cushioning when the user sits down, prevent danger due to unstable center of gravity, and provide the force required for standing, reducing the user's muscles and bone stress.

(2) The booster device of the present invention only relies on the translational motion of the original moving part to realize the different motion states of the follower, that is, the rising and tilting stages of the seat board, as well as the rising of the foldable pedal. and down state.

(3) The assisting device for getting up from the toilet of the present invention allows the user to maintain a posture close to the squatting posture when sitting. Compared with the sitting posture, the squatting posture has a larger anorectal angle, so the muscles can be completely relaxed, so the squatting posture is used It can make it easier for users to defecate. In addition, squatting defecation can also reduce the chance of accidents for people with cardiovascular and cerebrovascular diseases.

Description of drawings

Figure 1: Schematic diagram of the installation state of the power device for sitting and getting up of the present invention;

Figure 2: Schematic diagram of the assisting device for sitting and getting up of the present invention;

Figure 3: Schematic diagram of another angle of the assisting device for sitting and getting up of the present invention;

Figure 4: Schematic diagram of the side structure of the assisting device for sitting and getting up of the present invention;

Figure 5: a top view of the booster device for getting up from the toilet according to the present invention;

Fig. 6: Theoretical design diagram of the lowering state of the assisting device for sitting and getting up of the present invention;

Fig. 7: Theoretical design diagram of the rising state of the booster device for sitting and getting up in the present invention;

Fig. 8: A diagram of the stress situation of the power-assisted device for getting up from the toilet in the present invention;

Fig. 9: Schematic diagram of the pulley of the assisting device for getting up from the toilet according to the present invention.

Explanation of reference signs:

1—cushion board; 2—inclined rod; 3—transmission rod; 4—long slot hole; 5—bolt; 6—left linear motor; 7—right linear motor; 8—first support rod; 9—second support rod ; 10—base; 11—connecting cross bar; 12—the first block; 13—the second block; 14—the third block; 15—foldable pedal; 16—height adjustable armrest; 17—armrest fixed base; 18—armrest pole.

Detailed ways

Below in conjunction with Fig. 1 to Fig. 9, the present invention will be further described:

As shown in Fig. 1 to Fig. 3, a kind of assisting device for sitting and getting up needs to be used in conjunction with the toilet, and is placed on the outer ring of the toilet, including a seat board 1 and a base 10, the middle part of the seat board 1 is provided with a toilet hole, and the base 10 It is a U-shape matched with the toilet, and a lifting mechanism is provided between the seat board 1 and the base 10 for raising or lowering the seat board 1; the rear end of the seat board 1 is provided with a seat board angle adjustment mechanism for pushing The cushion board 1 is tilted forward or reset; the top, left and right sides of the cushion board 1 are respectively provided with a handrail 18 .

As shown in Figure 4, Figure 5, and Figure 9, the lifting mechanism includes a left scissor-type fork frame, a right scissor-type fork frame, a left linear motor 6 and a right linear motor 7, and a left scissor-type fork frame and a right scissor-type fork frame. A decorative cover is provided, and a chute is provided on the decorative cover to facilitate the rotation of the cushion plate 1. The left scissor-shaped fork frame and the right scissor-shaped fork frame are respectively hinged by the first support rod 8 and the second support rod 9 in an X shape. Wherein the lower end of the first support rod 8 is hinged with the base 10, and the base 10 is provided with a lower connection protrusion for hinged connection with the lower end of the first support rod 8, and the lower end of the second support rod 9 is hinged with the first pulley 12. Be provided with the first slide rail that cooperates with the first tackle 12 to slide forward and backward for the first tackle 12, the drive shafts of the left linear motor 6 and the right linear motor 7 are respectively hinged with the lower end of the second support rod 9 on the same side, the first The upper ends of the support bar 8 and the second support bar 9 are connected by a connecting cross bar 11, and the upper end of the second supporting bar 9 is hinged with one end of the connecting cross bar 11, and the connecting cross bar 11 is provided with a hinge for being hinged with the second support bar 9 upper ends. The upper connecting protrusion of the first support rod 8 is hinged with the second tackle 13, and the connecting cross bar 11 is provided with a second slide rail that cooperates with the second tackle 13 for the second tackle 13 to slide back and forth.

The lower sides of the left and right ends of the cushion plate 1 are respectively provided with a triangular connecting piece, one side of the triangle connecting piece is connected with the cushion plate 1, and a vertex opposite to the connecting edge is hinged with the connecting cross bar 11 on the same side.

The cushion plate angle adjustment mechanism comprises a slanting bar 2, the upper end of the slanting bar 2 is hinged with the rear end of the cushion plate 1, the lower end of the slanting bar 2 is provided with a latch 5, and the rear side of the second pulley 13 in the second slide rail is also provided with a second Three tackles 14, the third tackle 14 is provided with a through hole for the latch 5 to pass through, the latch 5 is inserted in the through hole of the third tackle 14, the second tackle 13 and the third tackle 14 are connected by the transmission rod 3, and the transmission The rear end of the rod 3 is provided with a slotted hole 4, the latch 5 is inserted in the slotted hole 4 and can move back and forth in the slotted hole 4, and the upper end of the second support rod 9 moves forward to drive all the parts on the transmission rod 3. The elongated slot 4 moves forward until the rear wall of the elongated slot 4 contacts the latch 5. At this time, the transmission rod 3 drives the lower end of the oblique rod 2 to move forward, thereby driving the upper end of the oblique rod 2 to push the back of the cushion plate 1. The end moves up, so that the cushion board 1 is inclined forward.

As shown in Figure 4 and Figure 5, a height-adjustable handrail 16 is respectively provided on both sides of the cushion board 1, and the height-adjustable handrail 16 is provided with adjustment buttons for controlling the left linear motor 6 and the right linear motor 7, and the height is adjustable. The below of armrest 16 is provided with armrest pole 18, is provided with ratchet on armrest pole 18, is provided with armrest fixing base 17 on the cushion board 1, and the lower end of armrest pole 18 is arranged in the armrest fixing base 17, and handrail is fixed A buckle groove is provided in the base 17, and a buckle for engaging with the ratchet is arranged in the buckle groove. One end of the buckle is connected with the L-shaped release switch by a pull wire, and the distance between the buckle and the groove wall of the buckle groove is The pull wire is covered with a reset spring, and the L-shaped release switch is arranged on the height-adjustable handrail 16. Lift the horizontal end of the L-shaped release switch to drive the pull wire to pull the buckle to separate from the ratchet. At this time, the reset spring shrinks. The height-adjustable armrest 16 can be adjusted up or down. When adjusted to a proper position, the L-shaped release switch is released, and under the action of the return spring, the buckle engages with the ratchet to lock the height-adjustable armrest 16 .

The height-adjustable armrest 16 is also provided with a hand grip, which is hinged with the height-adjustable armrest 16, so that the elderly can hold the hand grip to maintain balance or borrow strength when using it.

The front side of the base 10 is also provided with a foldable footrest 15, the foldable footrest 15 comprises a rectangular footrest above and four support rods below, the upper ends of each support rod are respectively hinged with the four corners of the footrest , the lower end of the support rod is hinged with the base 10, the left and right sides of the rear end of the pedal are respectively linked with the drive shaft of the left linear motor 6 or the right linear motor 7 on the same side through a rope, and the left linear motor 6 or the right linear motor The drive shaft of 7 promotes the lower end of the second support rod 9 to move forward or backward while the rope can be tightened or loosened so that the foldable pedal 15 is expanded and raised or folded and lowered.

When the cushion board 1 rises or falls horizontally, the foldable pedal 15 moves towards the cushion board 1 under the action of the left linear motor 6 and the right linear motor 7, and the foldable pedal 15 is lowered with the rise of the cushion board 1 , rises with the reduction of the cushion board 1, thereby adapting to crowds of different heights.

Performance index of the present invention is as follows:

The total area is about 0.444 square meters, and the handle height is 750mm; the rated voltage of the linear motor is 12V, the total installed power is about 100w, the total maximum thrust is about 2000N, the movement speed is 12mm/s under no-load state, and the lifting/lowering action is about It takes 8.3 seconds; the width of the cushion plate 1 is 340mm, and the length is 500mm, which can meet the installation requirements of most users and toilets; the length of the fork arm is 353mm, the stroke of the linear motor is 100mm, and the effective distance of the horizontal rise of the cushion plate 1 is 71.5mm; Height-adjustable armrests can be adjusted in 10 levels between 27mm and 117mm to meet the needs of users of different heights.

As shown in Figures 6 to 8, the working principle of the present invention is as follows:

Descending stage: the user leans on the cushion board 1 of the power-assisted device for getting up from the toilet, holds the height-adjustable armrest 16, presses the adjustment button on the height-adjustable armrest 16, the linear motor 6 and the linear motor 7 start and the drive shaft Shrink back, drive the upper end of the second support rod 9 to slide backward, and the power-assisted device for getting up from the toilet starts to provide the cushioning force for the user when sitting down. When the cushion board 1 reaches the horizontal state, that is, when the rear side groove wall of the long slot hole 4 is separated from the latch 5, the oblique rod 2 connected with the latch 5 is no longer stressed, and now the cushion board 1 begins to follow the left scissor fork. The frame and the right scissor fork frame descend horizontally; and when the button is pressed, the foldable pedal 15 will also start to expand and rise from the folded state as the drive shafts of the left linear motor 6 and the right linear motor 7 move backward, when the user When the appropriate height combination is reached, the adjustment button is turned off, and the power-assisted device for getting up from the toilet stops and is fixed, that is, the descending stage is completed.

Lifting stage: After the user finishes going to the toilet, reversely press the adjustment button on the height-adjustable handrail 16, the drive shafts of the left linear motor 6 and the right linear motor 7 begin to advance forward, and the left scissor fork and the right The scissor fork is folded and raised, so that the cushion plate 1 rises horizontally, at this time, the bolt 5 and the long slot 4 move toward each other until the bolt 5 moves to contact with the rear groove wall of the long slot 4, and the bolt 5 begins to be affected. force and transmit the force to the diagonal bar 2, at this moment, the cushion board 1 starts to rotate forward around the hinged shaft connecting it with the cross bar 11, and when the button is pressed, the foldable footrest 15 will also move from the unfolded state to the left side. The drive shafts of the linear motor 6 and the right linear motor 7 move forward and begin to fold and descend until the user returns to the center of gravity position when standing or closes the adjustment button when the user can recover the posture in the standing position with a slight boost from the handrail, then the power-assisted device for getting up from the toilet stops. and fixed, that is, the lifting phase is complete.

The innovation of the present invention mainly lies in the use of the groove pin structure, which realizes the purpose of using one movement mode of the driving part to achieve two different movement modes of the driven part in stages. At the same time, a follow-up lifting pedal is cleverly integrated into the device to provide users with the most scientific toilet posture. The device is simple in structure, ingenious in design, reliable and not easy to break, and fully considers the user's ergonomic experience when going to the toilet. It is widely used in scenarios such as toilets for the disabled or toilets for the disabled, and has good practicability and market prospects.

Above, the present invention has been exemplarily described in conjunction with the accompanying drawings. Obviously, the realization of the present invention is not limited by the above-mentioned manner, as long as various improvements of the method concept and technical solutions of the present invention are adopted, or the present invention is implemented without improvement. The ideas and technical schemes directly applied to other occasions are within the protection scope of the present invention.

Claims (10)

1. An assisting device for getting up from the toilet, comprising a seat board (1) with a toilet hole in the middle, and a lifting mechanism for supporting the seat board (1) is provided under the seat board (1), the feature is that : It also includes a seat board angle adjustment mechanism, the seat board angle adjustment mechanism is connected with the seat board (1), and is used to drive the seat board (1) to tilt forward or reset, and the seat board (1) is connected with the seat board (1) The lifting mechanism is hinged, and the seat board angle adjustment mechanism drives the seat board (1) to tilt forward so that the buttocks of the elderly can lean on the seat board (1) when they are standing, so as to sit down or get up. 2. The assisting device for getting up from the toilet according to claim 1, characterized in that: the angle adjustment mechanism of the cushion plate includes a diagonal rod (2) and an angle adjustment driving device, and the upper end of the diagonal rod (2) is in contact with the seat cushion The rear end of the plate (1) is linked, the lower end of the inclined rod (2) is hinged with the angle adjustment drive device, and the angle adjustment drive device pushes the displacement of the lower end of the inclined rod (2) to drive the inclined rod ( The upper end of 2) pushes the rear end of the cushion board (1) to be raised or reset, so that the cushion board (1) is tilted forward or reset. 3. According to claim 2, the described lifting device for getting up from the toilet is characterized in that: the lifting mechanism comprises a left scissor-type fork frame, a right scissor-type fork frame and a lifting drive device, and the lifting drive device is connected to the left scissor-type fork frame. The fork frame is connected to one end below the right scissor-type fork frame, and is used to change the respective articulation angles of the left scissor-type fork frame and the right scissor-type fork frame, thereby raising or lowering the The cushion plate (1) on the fork frame and the right scissor type fork frame. 4. The assisting device for getting up from the toilet according to claim 3, characterized in that: the angle adjustment driving device and the lifting driving device are the same power device, and the lower end of the inclined rod (2) is connected to the The upper end of the lifting mechanism is linked; the transmission mechanism includes a transmission rod (3), the front end of the transmission rod (3) is connected to the upper rear end of the left scissor-type fork or the right scissor-type fork, and the transmission The rear end of the rod (3) is provided with a slotted hole (4), and the lower end of the oblique rod (2) is provided with a pin (5), and the pin (5) is inserted into the slotted hole (4) And can move back and forth in the long slot hole (4), the upper rear end of the left scissor fork or the right scissor fork moves forward to drive the long slot on the transmission rod (3) The hole (4) moves forward until the rear groove wall of the long slot hole (4) contacts the pin (5), at this time, the transmission rod (3) drives the lower end of the oblique rod (2) forward Move, thereby driving the upper end of the inclined rod (2) to push the rear end of the cushion board (1) to move upward, so that the cushion board (1) tilts forward. 5. The assisting device for sitting and getting up according to claim 4, characterized in that: the power device includes a left linear motor (6) and a right linear motor (7), and the left linear motor (6) and the left scissors The lower end of the scissor-type fork is hinged to push the left scissor-type fork up or down, and the right linear motor (7) is hinged to the lower end of the right scissor-type fork to push the right The scissor forks are raised or lowered. 6. The device according to claim 5, characterized in that it further comprises a base (10), the left scissor-type fork frame and the right scissor-type fork frame are respectively composed of a first support rod (8) and a The second support rod (9) is hinged in an X shape, wherein the lower end of the first support rod (8) is hinged to the base (10), and the lower end of the second support rod (9) is connected to the base (10) Hinged and slidably connected, the left linear motor (6) and the right linear motor (7) are respectively hinged to the lower end of the second support rod (9) on the same side, and the first support The rod (8) and the upper end of the second support rod (9) are connected through a connecting cross bar (11), and the upper end of the second supporting rod (9) is hinged to one end of the connecting cross rod (11), so The upper end of the first support rod (8) is hinged and slidably connected to the connecting cross bar (11). 7. The assisting device for getting up from the toilet according to claim 6, characterized in that: the lower end of the second support rod (9) is hinged to the first trolley (12), and the base (10) is provided with a The first pulley (12) cooperates with the first slide rail for the first pulley (12) to slide back and forth, the upper end of the first support rod (8) is hinged with the second pulley (13), and the connecting cross bar ( 11) There is a second slide rail that cooperates with the second pulley (13) to allow the second pulley (13) to slide forward and backward, and a third pulley (14) is also arranged in the second slide rail, so The third pulley (14) is hinged to the lower end of the oblique rod (2) through the latch (5), and the third pulley (14) is provided with a through hole for the latch (5) to pass through. 8. The assisting device for getting up from the toilet according to claim 7, characterized in that: a height-adjustable armrest (16) is provided on both sides of the cushion board (1), and a height-adjustable armrest (16) is placed under the height-adjustable armrest (16). An armrest pole (18) is provided, and a ratchet is arranged on the armrest pole (18), and an armrest fixing base (17) is arranged on the seat cushion board (1), and the armrest fixing base (17) A buckle cooperating with the ratchet for locking is arranged inside, and a release device for unlocking the buckle and the ratchet is also arranged on the height-adjustable armrest (16). 9. The assisting device for getting up from the toilet according to claim 8, characterized in that: the height-adjustable armrest (16) is also provided with a hand grip, and the hand grip and the height-adjustable armrest (16) Hinged, it is convenient for the elderly to hold the handle to maintain balance or leverage when in use. 10. The assisting device for getting up from the toilet according to any one of claims 6-9, characterized in that: the front side of the base (10) is also provided with a foldable footrest (15), and the foldable footrest The upper end of (15) is linked with the drive shaft of the left linear motor (6) and/or the right linear motor (7) through a rope, and the left linear motor (6) and/or the right linear motor (7) ) driving shaft pushes the lower end of the second support rod (9) to move forward or backward, and at the same time, the rope can be tightened or loosened so that the foldable footrest (15) is unfolded and raised or folded and lowered.