CN108498245B

CN108498245B - Multifunctional wheelchair

Info

Publication number: CN108498245B
Application number: CN201810331080.7A
Authority: CN
Inventors: 陶国民
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-04-13
Filing date: 2018-04-13
Publication date: 2024-03-15
Anticipated expiration: 2038-04-13
Also published as: EP3777807B1; CN108498245A; EP3777807A4; KR102490831B1; KR20200138824A; AU2018418625A1; JP2021520284A; SG11202010074YA; AU2018418625B2; EP3777807A1; RU2767548C1; WO2019196146A1; JP7386467B2

Abstract

The invention discloses a multifunctional wheelchair, which comprises a base with wheels and an adjustable lifting device connected above the base, wherein the adjustable lifting device is arranged on the base; the adjustable lifting device comprises a seat plate, a backrest hinged with the rear end of the seat plate, a lower connecting plate connected with the base, and a supporting structure hinged between the seat plate and the lower connecting plate; the support structure comprises a front support rod assembly and a rear support rod assembly; the adjustable lifting device further comprises a driving mechanism for driving the supporting structure to rotate and/or driving the seat plate to lift, and the driving mechanism generates rotary motion or linear motion so as to enable the parallelogram mechanism formed by the seat plate, the front support rod assembly, the lower connecting plate and the rear support rod assembly to be in an unfolding state or a storage state. Because of adopting base and adjustable elevating gear complex structural style, the height, the angle of wheelchair main part are all adjustable, have more extensive suitability, are applicable to the lathe bed of various heights, and satisfy multiple user demands such as lying, left standing, removal, receipts and fold.

Description

Multifunctional wheelchair

Technical Field

The invention relates to medical care equipment, in particular to a multifunctional wheelchair for patients who lie on a bed for a long time or cannot independently move.

Background

At present, the wheelchair designed for a long-term bedridden person or a mobility impaired person is single in function, only can meet the use demands of the user such as wheelchair movement and the like, is fixed and unchangeable in structure, and when the user moves from a bed to the wheelchair, a plurality of persons are often required to lift and hold simultaneously, pressure is caused for family members and carers of patients, time and labor are wasted, the user is uncomfortable, and a plurality of family members or carers take care of the family simultaneously, so that a multifunctional wheelchair with comprehensive functions, flexible structure and reduced number of auxiliary staff is needed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a multifunctional wheelchair.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

a multifunctional wheelchair, which comprises a base with wheels and an adjustable lifting device connected above the base; the adjustable lifting device comprises a seat plate, a backrest hinged with the rear end of the seat plate, a lower connecting plate connected with the base, and a supporting structure hinged between the seat plate and the lower connecting plate; the support structure comprises a front support rod assembly and a rear support rod assembly; the adjustable lifting device further comprises a driving mechanism for driving the supporting structure to rotate and/or driving the seat plate to lift, wherein the driving mechanism generates rotary motion or linear motion so as to enable the parallelogram mechanism formed by the seat plate, the front support rod assembly, the lower connecting plate and the rear support rod assembly to be in an unfolding state or a storage state.

The further technical scheme is as follows: the upper supporting plate of the base is provided with a chute, and a pulley which is in sliding fit with the chute is arranged below the lower connecting plate so as to form sliding detachable connection between the adjustable lifting device and the base; or the lower connecting plate is an upper supporting plate of the base to form an integrated structure; or the lower connecting plate is fixedly connected with an upper supporting plate arranged on the base.

The further technical scheme is as follows: the sliding detachable connection adopts a chute locking structure and specifically comprises a pair of stop blocks, two chutes, two buffers and two locking blocks which are arranged at the front and rear of the base; the two locking blocks penetrate through the upper panel of the base and extend downwards to be connected to the upper part of the unlocking frame, the unlocking frame is connected to the lower part of the upper panel of the base in a sliding way through a guide rod, and the guide rod is sleeved with a self-locking spring which is stopped against the lower part of the unlocking frame; the stop block is stopped against the fixed bulge on the lower surface of the lower connecting plate of the adjustable lifting device.

The further technical scheme is as follows: the adjustable lifting device further comprises: a front baffle plate hinged with the front end of the seat plate; a front armrest hinged in the middle of the front end of the seat plate; the neck pillow is arranged at the outer end of the backrest; the front support rod assembly comprises a left front support rod and a right front support rod, and the rear support rod assembly comprises a left rear support rod and a right rear support rod.

The further technical scheme is as follows: the center of the seat plate is provided with a defecation through hole; an elastic frame type bracket positioned below the defecation through hole is arranged below the seat plate to elastically support the excrement container.

The further technical scheme is as follows: the driving mechanism is a motor with a speed reducing mechanism; the speed reducing mechanism is provided with an output shaft and is in transmission connection with a rotating shaft of any one of the front support rod assembly or the rear support rod assembly;

or the driving mechanism is a manual force-applying rod for generating rotary power, the outer end of the rotating shaft of any one of the front support rod assembly or the rear support rod assembly is provided with a torsion connecting part, and the manual force-applying rod is in transmission connection with the torsion connecting part;

or the driving mechanism is a linear power mechanism arranged between the lower connecting plate and any one of the seat plate, the front support rod assembly and the rear support rod assembly, and the linear power mechanism is an electric push rod, an air cylinder, an oil cylinder or a ball screw transmission mechanism;

or the driving mechanism is an air bag arranged between the lower connecting plate and the seat plate and an air pump connected with an air path of the air bag;

or the driving mechanism is a magnetic mechanism arranged between the lower connecting plate and the seat plate, and comprises a lower coil fixed on the lower connecting plate, an upper coil fixed on the lower surface of the seat plate, and a driving circuit electrically connected with the upper coil and the lower coil; the upper coil and the lower coil generate the same-level magnetic field, so as to generate repulsive force for lifting the seat plate upwards.

The further technical scheme is as follows: the left side and/or the right side of the base are/is hinged with an infusion support, and the infusion support is of an axial length adjusting rod-shaped structure.

The further technical scheme is as follows: the base is connected with a brace rod frame which is of a door-shaped frame structure and comprises a left side rod and a right side rod which are connected with the left rear side and the right rear side of the base, and a transverse pushing rod which is connected with the rear ends of the left side rod and the right side rod; when the backrest and the seat are in a 180-degree unfolding state, the transverse push rod is clamped in a transverse clamping groove arranged on the back surface of the backrest.

The further technical scheme is as follows: the two sides of the base are hinged with right-angle armrests, and the right-angle armrests are in a storage state when rotated forwards by 90 degrees.

The further technical scheme is as follows: the top of the adjustable armrests are provided with sockets for externally connecting with a desk plate.

The further technical scheme is as follows: the front end of the base is provided with a pedal.

Compared with the prior art, the beneficial effects are that:

compared with the traditional wheelchair, the multifunctional wheelchair has the following remarkable advantages:

the wheelchair adopts the structure form that the base is matched with the adjustable lifting device, so that the wheelchair main body has adjustable height and angle, has wider applicability, is suitable for beds with various heights, and meets various use requirements of lying, sitting, moving, folding and the like; the sliding detachable structure is adopted, so that the wheelchair main body and the base are conveniently used separately, the weight is lighter, the physical expenditure of a worker and family members of a patient is reduced, and under the condition that the application of the wheelchair is less in a movable working state, a plurality of wheelchair main bodies can share one base, so that the expenditure is reduced; the adjustable lifting device also comprises a seat plate with a defecation through hole in the center, a front baffle plate for supporting the lower leg part, a front handrail for supporting the user to lean against and a neck pillow for supporting the head, so that the comfort is improved and the safety is higher; because a plurality of power driving mechanisms can be adopted, manufacturers can flexibly select according to different cost and production key points; the base is additionally provided with a supporting rod frame for pushing the wheelchair, an armrest for supporting the elbow of a user, an external table board for placing articles and a pedal for supporting feet, and the wheelchair is comprehensive in function, firm and durable.

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

Drawings

FIG. 1 is a block diagram of a collapsed state of a particular embodiment of the wheelchair of the present invention;

FIG. 2 is a view showing a structure of the unfolded state (lying down state) of the embodiment of the multifunctional wheelchair shown in FIG. 1;

FIG. 3 is a view showing a structure of the unfolded state (seated state) of the embodiment of the multifunctional wheelchair shown in FIG. 1;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a view of a base portion of the wheelchair of FIG. 1;

FIG. 6 is a bottom perspective view of the adjustable lifting device of the multifunctional wheelchair of the present invention;

FIG. 7 is a simplified support structure and drive mechanism development schematic of the adjustable lift device of FIG. 6;

FIG. 8 is a side view of FIG. 5 (casters in exploded view);

fig. 9 is a bottom perspective view of fig. 5.

Reference numerals

1. Foot pedal 10

11. Infusion support 12 stop

13. Chute 14 buffer

15. Lock block 16 grab bar

17. Self-locking spring for wheel 18

19. First electric push rod of unlocking rack 111

112. Second electric push rod 113 third electric push rod

114. Side yoke plate of stay bar 115 armrest

116. Pedal link 117 armrest lower link

2. Adjustable front baffle of lifting device 21

22. Front armrest 23 neck pillow

3. Stool 31 through hole

4. Backrest for chair

5. Upper roller of lower connecting plate 51

52. Roller 53 transition support arm

54. Transition support rotating shaft 55 roller groove

56. Front lower support shaft of coupling head 57

58. Front upper support shaft of push shaft 59

6. Supporting structure

61. Front support bar assembly 62 rear support bar assembly

63. Rear lower support shaft 64 rear upper support shaft

7. Left side lever of brace bar frame 71

72. Transverse pushing rod

8. Right angle armrest 9 external desk board

Detailed Description

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention, but the invention may be practiced in other ways than as described, and therefore the scope of the invention is not limited to the specific embodiments disclosed below.

As shown in fig. 1, a multifunctional wheelchair comprises a base 1 with wheels 17 and an adjustable lifting device 2 coupled above the base 1.

As shown in fig. 2 to 4, the adjustable lifting device 2 comprises a seat plate 3, a backrest 4 hinged with the rear end of the seat plate 3, a lower connecting plate 5 connected with the base 1, and a supporting structure 6 hinged between the seat plate 3 and the lower connecting plate 5; the support structure 6 includes a front support bar assembly 61, a rear support bar assembly 62, the front support bar assembly 61 including a left front support bar and a right front support bar, and the rear support bar assembly 62 including a left rear support bar and a right rear support bar. The adjustable lifting device 2 further comprises a driving mechanism for driving the supporting structure 6 to rotate and/or for driving the seat plate 3 to lift, wherein the driving mechanism generates a rotary motion or a linear motion so as to enable the parallelogram mechanism formed by the seat plate 3, the front support rod assembly 61, the lower connecting plate 5 and the rear support rod assembly 62 to be in a unfolded state or a storage state. When the multifunctional wheelchair is in the unfolding state, the multifunctional wheelchair is in the working state, and can assist a worker or a family member of a carer to carry out daily cleaning activities on a user. When the multifunctional wheelchair is in the storage state, the multifunctional wheelchair is folded and stored, the volume is minimum, the multifunctional wheelchair can be easily folded at any corner, and the space occupation is reduced.

As shown in fig. 4 and 5, two sets of front and rear wheels 17 are symmetrically arranged below the base 1, the wheels 17 and the base 1 are detachably connected through threads, and the connection height can be adjusted according to the needs through artificial increase and decrease of the threaded engagement amount. Because the height of the bed body is different, when the height of the adjustable lifting device 2 can not meet the use requirement, the wheel 17 on the base 1 is used for assisting in adjusting the whole height of the multifunctional wheelchair, and the adjusting height range is suitable for most of the beds used in the market, so that the multifunctional wheelchair has wide universality.

In embodiment 1, as shown in fig. 6 and 7, the front lower support shaft 57, the front upper support shaft 59, the rear lower support shaft 63, and the rear upper support shaft 64 constitute four hinge positions of the support structure 6. The first electric push rod 111 is an electric telescopic rod, the fixed end of the first electric push rod 111 is hinged with a fixed support (arranged on a lower connecting plate 5 and belongs to a part of the lower connecting plate 5) of the adjustable lifting device 2, the movable end is sleeved on the outer ring of the push shaft 58 through a connecting head 56, two ends of the push shaft 58 are respectively provided with a roller 52, the rollers 52 roll in roller grooves 55 arranged on a left front support rod and a right front support rod, the fixed support of the adjustable lifting device 2 is also provided with a transition support rotating shaft 54, two ends of the transition support rotating shaft 54 are hinged with the fixed support, transition support arms 53 perpendicular to the axes of the transition support rotating shaft 54 are arranged at the near two ends of the transition support rotating shaft 54, the top ends of the transition support arms 53 are provided with upper rollers 51 with smaller diameters, and two ends of the push shaft 58 are respectively pivoted with the middle sections of the transition support arms 53. In the ascending process of the adjustable lifting device 2, the outer surface of the roller 52 is contacted with the roller groove 55, and when the movable end of the first electric push rod 111 stretches out, the roller 52 is driven to roll in the roller groove 55, so that the parallelogram formed by the seat 3, the front support rod assembly 61, the lower connecting plate 5 and the rear support rod assembly 62 is supported. When the adjustable lifting device 2 is lifted to a predetermined height (close to the maximum opening state), the roller 52 is separated from the roller groove 55, no supporting force is generated, the upper roller 51 at the top end of the transition supporting arm 53 is contacted with the edges of both sides of the roller groove 55 to generate supporting force, the moment arm is increased, and the reaction force applied to the first electric push rod 111 is reduced, so that the adjustable lifting device 2 can be more stable in the opening state. The supporting structure has the advantages that initial stress can be increased in the ascending process of the adjustable lifting device 2, the stroke of the electric push rod is shortened, the electric push rod is small in stress in the maximum state, the structural stability of each component is ensured, and the service life is prolonged. The upper roller 51 preferably has a stepped structure, i.e., a portion having a smaller diameter at both ends than at the middle.

In other embodiments, the upper support plate of the multifunctional wheelchair base 1 of the present invention is provided with a chute 13, and a pulley in sliding fit with the chute 13 is disposed below the lower connecting plate 5, so as to form a sliding detachable connection between the adjustable lifting device 2 and the base 1.

As shown in fig. 5, 8 and 9, in other embodiments, the adjustable lifting device 2 is detachably connected to the base 1 by a chute locking structure. The upper surface of the base 1 is provided with: four stoppers 12 (a pair each in front and back), two sliding grooves 13, two buffers 14, and two locking pieces 15; the two locking blocks 15 penetrate through the upper panel (i.e. the upper surface) of the base 1 and extend downwards to be connected to the upper side of the unlocking frame 19, the unlocking frame 19 is connected to the lower side of the upper panel of the base 1 in a sliding manner through a guide rod, and the guide rod is sleeved with a self-locking spring 18 which is stopped under the unlocking frame 19. The buffer 14 is internally provided with a buffer and shock-absorbing spring, so that secondary injury to a user caused by inertia in the assembly process is reduced. The stop block 12 is used for stopping the fixed protrusions (not shown in the figure, two groups are arranged near the front end, two groups are arranged near the rear end, and the number of the stop blocks 12 corresponds to that of the lower connecting plate 5 of the adjustable lifting device 2) for limiting after assembly. When the multifunctional wheelchair is combined for use, the lower connecting plate 5 of the adjustable lifting device 2 is connected in a sliding way along the sliding grooves 13 from the rear end of the base 1 towards the horizontal direction of the front end under the limiting action of the two sliding grooves 13, when the fixing protrusions on the lower surface of the lower connecting plate 5 act on the guide inclined surfaces of the locking blocks 15, the locking blocks 15 are pressed downwards, after the fixing protrusions near the rear end pass over the uppermost ends of the locking blocks 15, the locking blocks 15 automatically pop up upwards through the spring force generated by the self-locking springs 18 on the unlocking frame 19, and the fixing protrusions near the rear end are arranged between the stop blocks 12 and the locking blocks 15 at the rear end to form an assembling combination state. The labor saving and the safety of the assembly process are ensured by adopting the sliding chute 13 and the buffer 14, and the firm and reliable assembly effect is ensured by adopting the stop block 12 and the locking block 15. When the combined multifunctional wheelchair is disassembled, pressure is applied to the locking block 15, the locking block 15 is pressed down to the upper surface to be flush with the upper surface of the lower connecting plate 5, the elastic force of the buffer 14 faces the opposite direction of assembly, so that the adjustable lifting device 2 is unlocked and connected with the base 1, and then the adjustable lifting device 2 is dragged by external force to complete the disassembly, and the structure enables the disassembly process to be time-saving and labor-saving, and a single person can complete the operation. Specifically, when the assembly is performed, a user steps down on the cross bar part of the unlocking frame 19 (or presses down with other working tools), downward pressure is applied to the unlocking frame 19, so that the spring force of the self-locking spring 18 is overcome, the locking block 15 is driven to be pressed down to be flush with the upper surface of the lower connecting plate 5, the elastic force of the buffer 14 faces the opposite direction of assembly, the adjustable lifting device 2 is released from locking connection with the base 1 (namely, the assembly state is released), and then the adjustable lifting device 2 is dragged by external force, so that the assembly is completed. The pedal unlocking structure can lighten the working intensity of split personnel, and is convenient and reliable. The stopper 12 has an inverted L-shaped structure in the present embodiment to form a limiting cavity for accommodating the fixing protrusion, and can prevent the adjustable lifting device 2 from being separated from the base 1 upward in the assembled state.

In other embodiments, the lower connecting plate 5 is an upper supporting plate of the base 1, and the multifunctional wheelchair forms an integral structure.

Or, the lower connecting plate 5 is fixedly connected with the upper supporting plate arranged on the base 1, and the connection mode comprises threaded connection, welding and the like, so that the aim of obtaining the multifunctional wheelchair with an integrated structure is also to ensure the reliability and the durability of the wheelchair.

As shown in fig. 2, the adjustable lifting device 2 further includes:

a front baffle 21 hinged to the front end of the sitting plate 3, the front baffle 21 being inclined in cooperation with the user's lower leg when the wheelchair is in a sitting-up working state, for providing support force to the legs.

The front armrest 22 is hinged in the middle of the front end of the seat plate 3, when the wheelchair is in a sitting working state, the front armrest 22 rotates from a horizontal state to a vertical state for a user to hold, and the tension of the user in the moving process of the wheelchair is relieved.

The neck pillow 23 arranged at the outer end of the backrest 4 can be customized according to the use requirement of a user, the neck pillow 23 is fixedly connected to the outer end of the backrest 4 or is in an integrated structure with the outer end of the backrest 4, or the outer end of the backrest 4 is provided with a slot, and the lower part of the neck pillow 23 is provided with a matched inserted column for movable connection.

In other embodiments, as shown in fig. 9, the fixed end of the second electric push rod 112 is fixedly connected to the lower surface bracket of the base 1, the movable end is hinged to the armrest lower link 117, the armrest lower link 117 is fixedly connected to the armrest 16 through the fixedly connected armrest side link plate 115, and the armrest side link plate 115 is perpendicular to the armrest 16. When the grab rail 16 is in the horizontal state, the movable end of the second electric putter 112 is in the extended state in the contracted state. In the working state, the movable end of the second electric push rod 112 is contracted, so that the lower handrail link rod 117 is driven to rotate, and the lower handrail link rod 117 rotates and simultaneously drives the handrail rod 16 to rotate upwards through the fixedly connected handrail side connecting plate 115, so that the handrail rod 16 supports the elbow of a user.

Further, as shown in fig. 9, a pedal link 116 is sleeved in the middle of the armrest lower link 117, one end of the pedal link 116 is hinged to the armrest lower link 117, and the other end is hinged to the lower middle of the front pedal 21. In the working state, the movable end of the second electric push rod 112 is contracted, so that the armrest lower link 117 is driven to rotate, and the pedal link 116 is driven to rotate while the armrest lower link 117 rotates, so that the connected front pedal 21 rotates from the rear to the front, and the user can sit down to relieve the legs.

Further technical solution as shown in fig. 8, the fixed end of the third electric push rod 113 is fixedly connected to the fixed support of the base 1, the movable end is hinged to the lower end of the supporting rod 114, and as can be seen from fig. 1-3, the supporting rod 114 is vertically and fixedly connected to the left side rod 71 and the right side rod, when the backrest 4 is unfolded at an angle greater than 90 degrees, the third electric push rod 113 rotates, and then drives the supporting rod 114, the left side rod 71 and the right side rod to rotate and rise, and when the transverse push rod 72 contacts with the lower surface of the backrest 4, the driving mechanism stops driving, so that a stable state is achieved, sufficient supporting force is given to the backrest 4, and stable support of the back of a user is ensured.

The electric push rod in the above embodiment can be replaced by other linear power mechanisms, such as a ball screw mechanism with a motor or a screw mechanism, and a cylinder or an oil cylinder connected with a pressure source.

As shown in fig. 2 and 3, the seat 3 is provided with a defecation through hole 31 at the center thereof, and an elastic frame-type bracket below the defecation through hole 31 is provided below the seat 3 to elastically support the excrement container, thereby improving the support effectiveness of the excrement container and the convenience of the container disassembly and replacement.

In other embodiments, the seat 3 has a through hole 31 at its center for the user to excrete daily in the wheelchair, and a chute or bracket below the seat 3 is provided below the through hole 31 for slidably coupling or supporting an excrement container, which may be a bedpan, a disposable bag or the like according to specific needs.

In other embodiments, the drive mechanism of the multifunctional wheelchair of the present invention is an electric motor with a speed reduction mechanism; the speed reducing mechanism is provided with an output shaft and is in transmission connection with the rotating shaft of either the front support rod assembly 61 or the rear support rod assembly 62.

In other embodiments, the driving mechanism is a manual force-applying rod for generating rotation power, and the outer end of the rotating shaft of either the front support rod assembly 61 or the rear support rod assembly 62 is provided with a torsion coupling part, and the manual force-applying rod is in transmission connection with the torsion coupling part.

In other embodiments, the driving mechanism is a linear power mechanism arranged between the lower connecting plate 5 and any one of the seat plate 3, the front support rod assembly 61 and the rear support rod assembly 62, and the linear power mechanism is an electric push rod, an air cylinder, an oil cylinder or a ball screw transmission mechanism.

In other embodiments, the driving mechanism is an air bag arranged between the lower connecting plate 5 and the seat plate 3, and an air pump connected with the air path of the air bag.

In other embodiments, the driving mechanism is a magnetic mechanism arranged between the lower connecting plate 5 and the seat plate 3, and the magnetic mechanism comprises a lower coil fixed on the lower connecting plate 5, an upper coil fixed on the lower surface of the seat plate 3, and a driving circuit electrically connected with the upper coil and the lower coil; the upper coil and the lower coil generate the same-level magnetic field, thereby generating the repulsive force of the seat plate 3 rising upward.

As shown in fig. 2-3, the left side and/or the right side of the base 1 are/is hinged with an infusion support 11, the infusion support 11 is in an axial length adjusting rod-shaped structure, and when a user needs to defecation or other daily cleaning work on the multifunctional wheelchair of the invention in the infusion process, the infusion support 11 is stretched from a storage state to a required height and then is used for hanging an infusion bottle/bag.

In other embodiments, the base 1 is coupled with a strut frame 7, and the strut frame 7 is a portal frame structure, including a left side bar 71 and a right side bar coupled to the left rear side and the right rear side of the base 1, and a transverse push rod 72 coupled to the rear ends of the left side bar 71 and the right side bar. The strut frame 7 is used for protecting workers or family members of patients to push the wheelchair to move by the rear of the wheelchair, when the backrest 4 and the seat 3 are in a 180-degree unfolding state, the transverse push rod 72 is clamped in a transverse clamping groove arranged on the rear back surface of the backrest 4, upward supporting force is provided for the backrest 4, and the safety of the patients in a lying use state such as hair washing, bathing and the like is ensured.

In other embodiments, the two sides of the base 1 are hinged with right angle armrests 8, and the right angle armrests 8 are in a storage state when rotated forward by 90 degrees. In the vertical state, the right angle armrest 8 is in a use state and is used for users to lean against. Furthermore, the top of the right-angle armrest 8 is provided with a socket for the external desk plate 9, and when a user needs to take food, read, bath and other activities on the multifunctional wheelchair, the external desk plate 9 is used for placing necessary articles.

In other embodiments, the front end of the base 1 is provided with a foot rest 10 for supporting feet, which is more beneficial to the use of the patient with the excretion inconvenience such as the elderly or the patients in the bed, and the like, and relieves the defecation pressure.

The invention also discloses the following technical scheme:

a labor-saving short-stroke connecting rod structure can be used for lifting articles such as tables and chairs, and is particularly suitable for product structures with small space. The concrete structure is as follows: a labor-saving short-stroke connecting rod structure comprises an upper connecting plate (a seat plate in the embodiment of fig. 1-9), a lower connecting plate and a supporting structure hinged between the upper connecting plate and the lower connecting plate; the support structure comprises a front support rod assembly and a rear support rod assembly; the device also comprises a driving mechanism for driving the supporting structure to rotate, wherein the driving mechanism generates linear motion so as to enable a parallelogram mechanism formed by the upper connecting plate, the front supporting rod assembly, the lower connecting plate and the rear supporting rod assembly to be in an unfolding state or a storage state; the front support rod assembly comprises a left front support rod and a right front support rod, and the rear support rod assembly comprises a left rear support rod and a right rear support rod; the driving mechanism is an electric telescopic rod; the fixed end of the electric telescopic rod is hinged with the lower connecting plate, the movable end of the electric telescopic rod is sleeved on the outer ring of the push shaft through a connecting head, two ends of the push shaft are respectively provided with a roller, the rollers roll in roller grooves formed in the left front supporting rod and the right front supporting rod, the lower connecting plate is also provided with a transition supporting rotating shaft, two ends of the transition supporting rotating shaft are hinged with the lower connecting plate, the transition supporting arms perpendicular to the axes of the transition supporting shafts are arranged at the positions of the two ends of the transition supporting rotating shaft, the top ends of the transition supporting arms are provided with upper rollers, and the two ends of the push shaft are respectively pivoted with the middle sections of the transition supporting arms. In the ascending process, the outer surface of the roller is contacted with the roller groove, and when the movable end of the electric telescopic rod stretches out, the roller is driven to roll in the roller groove, so that the parallelogram formed by the upper connecting plate, the front supporting rod assembly, the lower connecting plate and the rear supporting rod assembly is supported. When the adjustable lifting device rises to a preset height (close to a maximum opening state), the idler wheels are separated from the idler wheel grooves, no supporting force is generated, the upper roller at the top end of the transition supporting arm is contacted with the edges of the two sides of the idler wheel grooves to generate supporting force, the moment arm is enlarged, the reaction force born by the first electric push rod is reduced, and therefore the adjustable lifting device can be more stable in the opening state. The supporting structure has the advantages that initial stress can be increased in the ascending process of the adjustable lifting device, the stroke of the electric push rod is shortened, the electric push rod is small in stress in the maximum state, the structural stability of each component is ensured, and the service life is prolonged. The upper roller is preferably in a stepped configuration, i.e., with two ends having a smaller diameter than the middle.

The labor-saving short-stroke connecting rod structure can be used for multifunctional wheelchairs, particularly as shown in the embodiment of figures 1-9, and also can be used for various chair structures, such as student seats, automobile seats and the like.

The invention also discloses a linkage link mechanism for the seat; the seat comprises a base, a handrail rod hinged with two sides of the base, and a foot pedal hinged with the front end of the base; the straight line driving mechanism is arranged between the base and the grab rail; the fixed end of the linear driving mechanism is fixedly connected with the bracket of the base, the movable end of the linear driving mechanism is hinged with the lower handrail connecting rod, and the lower handrail connecting rod is fixedly connected with the handrail rod through a fixedly connected handrail side connecting plate; when the grab rail is in a horizontal state, the grab rail is in a contracted state, and the movable end of the linear driving mechanism is in an extending state; under the working state, the movable end of the linear driving mechanism is contracted, so that the lower handrail connecting rod is driven to rotate, and meanwhile, the handrail rod is driven to rotate upwards through the fixedly connected handrail side connecting plate, and the handrail rod props up to support the elbow of a user.

The further technical scheme is as follows: the pedal connecting rod is sleeved in the middle of the lower handrail connecting rod, one end of the pedal connecting rod is hinged to the lower handrail connecting rod, and the other end of the pedal connecting rod is hinged to the middle of the lower part of the front pedal; under the working state, the movable end of the linear driving mechanism is contracted, so that the lower handrail connecting rod is driven to rotate, and the pedal connecting rod is driven to rotate when the lower handrail connecting rod rotates, so that the connected front pedal rotates forwards from the rear, and a user can relieve legs when sitting.

The linkage for a seat of the present invention may be used in a multi-function wheelchair, particularly as shown in the embodiments of fig. 1-9, and may also be used in various chair configurations, such as folding seats, car seats, and the like.

In summary, the multifunctional wheelchair disclosed by the invention has the advantages that the structure mode of matching the base with the adjustable lifting device is adopted, so that the height and the angle of the wheelchair main body are adjustable, the multifunctional wheelchair has wider applicability, is suitable for lathes with various heights, and can meet various use requirements of lying, sitting, moving, folding and the like; the sliding detachable structure is adopted, so that the wheelchair main body and the base are conveniently used separately, the weight is lighter, the physical expenditure of a worker and family members of a patient is reduced, and under the condition that the application of the wheelchair is less in a movable working state, a plurality of wheelchair main bodies can share one base, so that the expenditure is reduced; the adjustable lifting device also comprises a seat plate with a defecation through hole in the center, a front baffle plate for supporting the lower leg part, a front handrail for supporting the user to lean against and a neck pillow for supporting the head, so that the comfort is improved and the safety is higher; because a plurality of power driving mechanisms can be adopted, manufacturers can flexibly select according to different cost and production key points; the base is additionally provided with a supporting rod frame for pushing the wheelchair, an armrest for supporting the elbow of a user, an external table board for placing articles and a pedal for supporting feet, and the wheelchair is comprehensive in function, firm and durable.

The foregoing is merely illustrative of the present invention to facilitate understanding, but is not intended to limit the scope of the invention to any way of extension or re-creation according to the invention. The protection scope of the invention is subject to the claims.

Claims

1. A multifunctional wheelchair, includes the base that has the wheel, its characterized in that: the adjustable lifting device is connected above the base; the adjustable lifting device comprises a seat plate, a backrest hinged with the rear end of the seat plate, a lower connecting plate connected with the base, and a supporting structure hinged between the seat plate and the lower connecting plate; the support structure comprises a front support rod assembly and a rear support rod assembly; the front support rod assembly comprises a left front support rod and a right front support rod, and the rear support rod assembly comprises a left rear support rod and a right rear support rod; the adjustable lifting device further comprises a driving mechanism for driving the supporting structure to rotate so as to drive the seat plate to lift, and the driving mechanism generates linear motion so that a parallelogram mechanism formed by the seat plate, the front support rod assembly, the lower connecting plate and the rear support rod assembly is in an unfolding state or a storage state;

the driving mechanism is a linear power mechanism arranged between the lower connecting plate and any one of the seat plate, the front support rod assembly and the rear support rod assembly, and the linear power mechanism is an electric push rod, an air cylinder, an oil cylinder or a ball screw transmission mechanism;

the four hinge positions of the supporting structure comprise a front lower supporting shaft, a front upper supporting shaft, a rear lower supporting shaft and a rear upper supporting shaft; the adjustable lifting device comprises a fixed support, the fixed support is arranged on the lower connecting plate and belongs to a part of the lower connecting plate, a linear power mechanism and a pushing shaft are arranged on the fixed support, the fixed end of the linear power mechanism is hinged to the fixed support, the movable end of the linear power mechanism is provided with a connecting head and sleeved on the outer ring of the pushing shaft through the connecting head, two ends of the pushing shaft are respectively provided with a roller, the rollers roll in roller grooves formed in a left front supporting rod and a right front supporting rod, the fixed support of the adjustable lifting device is further provided with a transition supporting rotating shaft, two ends of the transition supporting rotating shaft are hinged to the fixed support, a transition supporting arm perpendicular to the axis of the transition supporting shaft is arranged at the positions of the two ends of the transition supporting rotating shaft, an upper roller is arranged at the top end of the transition supporting arm, and two ends of the pushing shaft are respectively pivoted to the middle section of the transition supporting arm.

2. The multifunctional wheelchair according to claim 1, wherein the upper support plate of the base is provided with a chute, and a pulley in sliding fit with the chute is arranged below the lower connecting plate to form a sliding detachable connection between the adjustable lifting device and the base;

or the lower connecting plate is an upper supporting plate of the base to form an integrated structure;

or the lower connecting plate is fixedly connected with an upper supporting plate arranged on the base.

3. The wheelchair of claim 1 wherein the adjustable lifting device further comprises:

a front baffle plate hinged with the front end of the seat plate;

a front armrest hinged in the middle of the front end of the seat plate;

and the neck pillow is arranged at the outer end of the backrest.

4. The multifunctional wheelchair according to claim 1, wherein the seat plate is provided with a defecation through hole in the center;

an elastic frame type bracket positioned below the defecation through hole is arranged below the seat plate to elastically support the excrement container.

5. The wheelchair of any one of claims 1 to 4, wherein the left and/or right sides of the base are/is hinged with infusion supports, and the infusion supports are in axial length-adjustable rod-shaped structures.

6. The wheelchair of any one of claims 1-4, wherein the base is coupled with a strut frame, the strut frame being a portal frame structure comprising a left side bar and a right side bar coupled to the left rear side and the right rear side of the base, and a transverse pushing bar coupled to the rear ends of the left side bar and the right side bar; when the backrest and the seat are in a 180-degree unfolding state, the transverse push rod is clamped in a transverse clamping groove arranged on the back surface of the backrest.

7. The wheelchair of any one of claims 1 to 4, wherein the base is hinged on both sides with right angle armrests, which are stowed when rotated 90 degrees forward.

8. The multifunctional wheelchair of claim 7, wherein the top of the right-angle armrest is provided with a socket for externally connecting with a desk plate.

9. The multifunctional wheelchair of claim 1, wherein the front end of the base is provided with a foot pedal.