CN113662764A

CN113662764A - A new type of multifunctional wheelchair

Info

Publication number: CN113662764A
Application number: CN202110990676.XA
Authority: CN
Inventors: 李博; 雷星驰; 赵斐然
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-11-19

Abstract

The invention specifically discloses a novel multifunctional wheelchair, including a seat device and a moving device, the seat device is on the top surface of the moving device; the seat device includes an electrically adjustable backrest, a movable armrest, a seat frame, an electrically adjustable control device, The movable armrest and double crank structure; the mobile device includes front wheel, driving wheel, damping spring, rear wheel, and driving device; the adjustable backrest is connected with a parallel double crank mechanism for adjusting the angle of the backrest, and the lower end of the double crank mechanism is installed There are rear wheels, and two shock-absorbing damping springs are hinged on the rear side of the seat frame. The novel multifunctional wheelchair of the present invention can provide better experience for the elderly or the handicapped. By changing the backrest angle of the wheelchair, the elderly or the disabled can find a backrest angle that suits them. At the same time, when the backrest angle changes, the armrest will also move with the backrest and maintain a horizontal state due to the characteristics of the parallelogram mechanism, allowing the user to Your arms are always resting on the armrests for maximum comfort.

Description

Novel multifunctional wheelchair

Technical Field

The invention relates to the technical field of medical instruments, in particular to a novel multifunctional wheelchair.

Background

The appearance of the wheelchair provides great convenience for the old and the disabled to go out for activities, see a doctor and the like, but the wheelchair on the market at present has the problems of single function, narrow application range and the like. Therefore, the selection of the wheelchair is convenient to operate, safe and reliable to operate and has multiple functions, and the more functions of the wheelchair, the more convenient the old and the disabled to use. The wheel chair is provided with a reasonable mechanical structure, and the wheel chair is compact and light in structure, thereby achieving the purposes of multiple functions and multiple purposes. The research on the novel multifunctional wheelchair can provide convenience for the old and the disabled to go out for activities, see a doctor and the like, so that the novel multifunctional wheelchair has great application value.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a novel multifunctional wheelchair.

In order to achieve the purpose, the invention provides the following technical scheme: a novel multifunctional wheelchair comprises a seat device and a moving device, wherein the seat device is arranged on the top surface of the moving device;

the seat device comprises an electric adjustable backrest, a movable armrest, a seat frame, an electric adjusting control device, a movable leg support and a double-crank structure;

the moving device comprises a front wheel, a driving wheel, a damping spring, a rear wheel and a driving device;

the adjustable backrest is connected with a parallel double-crank mechanism for adjusting the angle of the backrest, the lower end of the double-crank mechanism is provided with a rear wheel, and the rear wheel provides auxiliary support when the backrest is in a completely flattened state; the adjustable backrest is hinged with the chair frame, two ends of the double-crank structure are respectively hinged with the adjustable backrest and the chair frame, the movable armrest is fixedly arranged at the upper end of the double-crank structure, and the front end of the chair frame is hinged with the upper ends of the movable supporting legs;

the front wheel is arranged at the front end of the lower end of the chair frame, the driving device is arranged in the chair frame, the driving wheel is connected with the driving device through a transmission shaft and is arranged on two sides of the chair frame, and the rear side of the chair frame is hinged with two damping springs.

Preferably, the double-crank structure is fixedly provided with a backrest rod, one end of the backrest rod is hinged to the connecting rod, the other end of the connecting rod is hinged to the crank, the other end of the crank is fixedly connected with a worm wheel, the worm wheel is in meshing transmission fit with the worm, one end of the worm is connected with an output shaft of the motor, and the automatic adjustment of the electric adjustable backrest angle within the range of 90-180 degrees is realized by controlling the forward and reverse rotation of the motor according to the self-locking principle of the worm wheel and the worm.

Preferably, the movable handrail is installed on the connecting rod of double crank structure, the double crank structure is parallelogram mechanism, install the electricity adjusting device on the movable handrail, first motor and second motor in electricity adjusting device electric connection motor and the drive arrangement for the rotational speed and the break-make electricity of adjustment motor and first motor and second motor.

Preferably, the movable leg supporter is rotatably connected with a pull rod, the chair frame is fixedly provided with a hook plate, the pull rod is hung on the hook plate, so that the angle adjustment of the movable leg supporter can be realized, and the adjustable angle range is 90-180 degrees.

Preferably, the driving wheel is a pair of three-planetary-wheel mechanisms, and the stair climbing function is realized by the rotation of the planetary carrier and the non-rotation of the tire.

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

1. the novel multifunctional wheelchair can realize the free adjustment of the backrest angle within the range of 90-180 degrees. When the backrest is completely unfolded and flat, the wheelchair becomes a simple bed, so that the old or the disabled can conveniently lie down to have a rest.

2. The novel multifunctional wheelchair can enable the old or the disabled to have better experience. Through changing the back angle of wheelchair, can make old man or disabled person find the back angle that is fit for oneself, simultaneously, when the back angle changes, because the characteristic handrail of parallelogram mechanism also can remove and keep the horizontality with the back together, let user's arm put on the handrail with the most comfortable state all the time. The adjusting mode is realized by adopting a motor to control the speed reducer, and the operation is more convenient.

3. The reducer is designed by adopting worm and gear transmission, not only because the transmission ratio is large, but also more importantly, the self-locking principle of the worm and gear is utilized, so that the purposes of stopping the motor and immediately locking the backrest are realized.

4. The leg support is adjustable. The leg support of the scheme can realize the adjustment angles of 30 degrees, 60 degrees and 90 degrees, and a user can freely adjust according to own conditions.

Drawings

FIG. 1 is a front view schematically illustrating the structure of a multifunctional wheelchair according to the present invention;

FIG. 2 is a schematic side view of a multifunctional wheelchair of the present invention;

FIG. 3 is a schematic side view of a multifunctional wheelchair of the present invention;

FIG. 4 is a schematic structural view of the backrest transmission mechanism of FIG. 3 of the new multifunctional wheelchair of the invention;

FIG. 5 is a schematic view of the adjustment of the movable leg support of the multifunctional wheelchair of the present invention;

FIG. 6 is a schematic view of the movable armrest of the multifunctional wheelchair of the present invention;

FIG. 7 is a schematic view of the parallel four-bar linkage movement of the novel multifunctional wheelchair of the present invention;

FIG. 8 is a diagram of a preset trajectory of a four-bar linkage of the new multifunctional wheelchair of the present invention;

FIG. 9 is a force analysis diagram of the backrest of the multifunctional wheelchair according to the present invention in a flattened state;

FIG. 10 is the movement principle of the driving wheel of the new multifunctional wheelchair of the invention;

fig. 11 shows the internal structure of the driving device of the novel multifunctional wheelchair.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various embodiments of the invention. It should be understood, however, that these physical details should not be construed as limiting the invention. That is, in some embodiments of the invention, such physical details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 11, the novel multifunctional wheelchair of the present embodiment comprises: the seat device is arranged on the top surface of the mobile device; the seat device comprises an electric adjustable backrest 1, a movable armrest 2, a seat frame 3, an electric adjusting device 4 and a movable leg support 5, and the moving device comprises a front wheel 6, a driving wheel 7, a damping spring 8, a rear wheel 9 and a driving device 10.

The adjustable backrest 1 is connected with a parallel double-crank mechanism 14 for adjusting the angle of the backrest, and a rear wheel 9 is mounted on the adjustable backrest, so that auxiliary support can be provided when the backrest is in a completely flattened state, and the stability is improved; the adjustable backrest 1 is hinged with the chair frame 3, the movable armrest 2 is respectively hinged with the adjustable backrest 1 and the chair frame 3 through a pair of parallel double-crank mechanisms 15, and the chair frame 3 is hinged with the movable leg support 5.

The front wheel 6 is arranged at the front end of the chair frame 3, the driving device is arranged in the chair frame 3, the driving wheel 7 is connected with the driving device 10 through a transmission shaft and is arranged at two sides of the chair frame 3, and the rear side of the chair frame 3 is hinged with two damping springs 8.

As shown in fig. 2, the electric adjustable backrest 1 can realize the free switching from the vertical ground state to the completely flat state. The motor 13 is connected with one end of the worm 12, the worm 12 is matched with the worm wheel 11, the worm wheel 11 is fixedly connected with the crank 18, the other end of the crank 18 is hinged with the connecting rod 19, the other end of the connecting rod 19 is hinged with the back rest rod 20, according to the self-locking principle of the worm wheel and the worm, a parallel double-crank mechanism (shown in figures 6, 7 and 8) optimally designed by an analytic method is connected with the worm wheel 11 and the worm 12 in series, and the automatic adjustment of the angle of the back rest 1 within the range of 90-180 degrees can be realized by controlling the forward and reverse rotation of the motor 13.

As shown in fig. 6, the movable handrail 2 is mounted on a connecting rod of the parallel double-crank mechanism 15, and the electric adjusting device 4 is mounted on the movable handrail 2.

As shown in figure 5, the angle of the movable leg support 5 can be adjusted by mounting the pull rod 17 on the hook plate 16 of the movable leg support 5 through the hook plate 16 mounted on the chair frame 3, and the adjustable angle range is 90-180 degrees.

As shown in fig. 10, the driving wheel 7 is a pair of three-planetary-wheel mechanisms, and the movement principle is as follows: the switching between the stair climbing function and the bottom walking function can be realized by controlling the planet carrier; walking on the flat ground: the second motor is not operated when the power is cut off, the first motor transfers power to the central shaft after being decelerated by the speed reducer, then the power is transferred to the transition gear and the transmission gear, and finally the three star wheels rotate simultaneously through the fixing shaft. At the moment, the output power of the motor for controlling the rotating speed of the wheelchair is the same, the rotating direction and the rotating speed of each star wheel are the same, the planet wheels at the upper ends of the star wheels are in an idling state, and two pairs of wheels in contact with the ground are in charge of driving; turning time: when the steering is required, a rotation speed difference is formed by controlling the rotation speeds of the pair of motors, and at the moment, the speed of the external motor is higher than that of the internal motor, or the steering of the control motors is opposite, so that the steering can be realized; climbing stairs at all times: the first motor is powered off and stopped, the second motor transmits driving force to the outer ring shaft and the planet carrier after passing through the speed reducer, and the planet carrier is driven to roll at the moment. At the moment, the motor steering and the rotating speed of the two sides which are responsible for controlling the planet wheel carrier are the same, and at the moment, the three planet wheels are not rotated and are only fixed on the planet carrier.

The working principle of the novel multifunctional wheelchair is as follows:

when a user sits on the wheelchair, the electric adjusting device 4 on the movable armrest 2 is opened, the model of the electric adjusting device 4 is USP425-1U2, the motor 13 is started at the moment, the backrest angle is slowly adjusted through the transmission of the worm wheel 11 and the worm 12 mechanism, when the user finds the most comfortable sitting posture, the electric adjusting device 4 is closed, the motor 13 stops rotating at the moment, and the backrest angle is instantly locked through the self-locking principle of the worm wheel 11 and the worm 12. When the angle of the backrest changes, the movable armrests 2 are mounted on the links of the parallelogram mechanism, so that the armrests move together with the backrest, and the arms of the user are always placed on the armrests in the most comfortable state.

When the backrest of the wheelchair is placed at ordinary times, the wheelchair becomes a movable simple bed, and the old or the disabled can conveniently lie down to have a rest. In addition, the angle of the movable leg support 5 can be freely adjusted, firstly, the pull rod 17 is placed on the hook plate 16 through adjusting the hook plate 16, the angle adjustment can be realized, the leg support of the scheme can realize the angle adjustment of 30 degrees, 60 degrees and 90 degrees, and a user can freely adjust according to own conditions.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A novel multifunctional wheelchair, characterized in that it comprises a seat device and a mobile device, and the seat device is on the top surface of the mobile device;

The seat device comprises an electrically adjustable backrest (1), a movable armrest (2), a seat frame (3), an electrically adjustable control device (4), a movable legrest (5), and a double crank structure (15);

The moving device includes a front wheel (6), a driving wheel (7), a shock-absorbing damping spring (8), a rear wheel (9), and a driving device (10);

The adjustable backrest (1) is connected with a parallel double crank mechanism (14) for adjusting the angle of the backrest, a rear wheel (9) is installed at the lower end of the double crank mechanism (14), and the rear wheel (9) is fully extended when the backrest is fully extended. Auxiliary support is provided in a flat state; the adjustable backrest (1) is hinged with the seat frame (3), and both ends of the double crank structure (15) are hinged with the adjustable backrest (1) and the seat frame (3) respectively, and the movable backrest (1) is hinged with the seat frame (3). The armrest (2) is fixedly arranged on the upper end of the double crank structure (15), and the front end of the chair frame (3) is hinged with the upper end of the movable leg (5);

The front wheel (6) is installed at the front end of the lower end of the seat frame (3), the driving device (10) is installed inside the seat frame (3), and the driving wheel (7) is connected with the driving device (10) through a transmission shaft It is installed on both sides of the chair frame (3), and two shock-absorbing damping springs (8) are hinged on the rear side of the chair frame (3).

2. A novel multifunctional wheelchair according to claim 1, characterized in that a backrest rod (20) is fixedly installed on the double crank structure (14), and one end of the backrest rod (20) is hinged with the connecting rod (19) , the other end of the connecting rod (19) is hinged with the crank (18), and the other end of the crank (18) is fixedly connected to the worm wheel (11), the worm wheel (11) and the worm (12) are engaged in meshing transmission, the worm (12) One end is connected with the output shaft of the motor (13), according to the self-locking principle of the worm gear (11) and the worm (12), the electric adjustable backrest (1) is realized by controlling the forward and reverse rotation of the motor (13). Automatic adjustment of the angle in the range of 90-180 degrees.

3. A new type of multifunctional wheelchair according to claim 1, characterized in that: the movable armrest (2) is installed on the connecting rod of the double crank structure (15), and the double crank structure (15) is A parallelogram mechanism, an ESC device (4) is installed on the movable armrest (2), and the ESC device (4) is electrically connected to the motor (13) and the first motor and the second motor in the drive device (10), It is used to adjust the rotational speed and on-off of the motor (13), the first motor and the second motor.

4. A novel multifunctional wheelchair according to claim 1, characterized in that a pull rod (17) is rotatably connected to the movable leg (5), and a hook plate is fixedly arranged on the chair frame (3). (16), by hanging the pull rod (17) on the hook plate (16), the angle adjustment of the movable leg (5) can be realized, and the adjustable angle range is 90-180 degrees.

5 . The novel multifunctional wheelchair according to claim 1 , wherein the driving wheels ( 7 ) are a pair of three planetary gear mechanisms, and the stair climbing function is realized by the rotation of the planet carrier without the rotation of the tires. 6 .