A wheelchair bed

Abstract

A wheelchair bed, comprising a wheelchair bed main body, a lifting push rod assembly (15) for lifting the wheelchair bed main body, and a lifting diagonal brace assembly (7) for maintaining the balance of the wheelchair bed main body; the lifting push rod assembly (15) includes a chassis (151), a support body (152), a scissors hinge (153) respectively connected to the chassis (151) and the support body (152), and a push rod mechanism (154) connected to the scissors hinge (153); the lifting diagonal brace assembly (7) further includes a central adjustment pin (16) installed on the support body (152), an alignment frame assembly (14) connected to the wheelchair bed main body and rotatably installed on the central adjustment pin (16), and an alignment push rod (17) installed on the support body (152) and connected to the alignment frame assembly (14). The wheelchair bed of the present invention has a novel design and strong practicability.

Description

Technical Field

[0001] The present invention relates to the technical field of medical care equipment, and in particular to a wheelchair bed. Background Art

[0002] Patients who have just undergone surgery and cannot get out of bed on their own, or elderly people with physical disabilities, generally need to stay in bed for a long time. However, continuous bed rest can easily cause bedsores, pneumonia and various chronic diseases, and patients or elderly people need to be promptly turned over and given medical care. At the same time, when they need to move, caregivers need to transfer bedridden patients or elderly people to wheelchairs, which is very inconvenient. In addition, some patients or elderly people often do not have good care conditions and have to sit in wheelchairs or lie in bed for a long time. They cannot switch between lying in bed and sitting in a wheelchair on their own, which seriously affects their physical and mental health and quality of life. In order to solve the above problems, people have invented wheelchair beds with wheelchair states and bed states. However, the existing wheelchair beds have relatively single functions and cannot take into account the functions of lifting and maintaining balance when going uphill or downhill. Summary of the invention

[0003] In view of the above problems, the present invention provides a wheelchair bed.

[0004] The technical solution proposed by the present invention for the above-mentioned technical problem is as follows:

[0005] The present invention provides a wheelchair bed, comprising a wheelchair bed body, a lifting push rod assembly for lifting the wheelchair bed body, and a lifting diagonal brace assembly for maintaining the balance of the wheelchair bed body;

[0006] The lifting push rod assembly includes a base frame, a support body, a scissor hinge frame connected to the base frame and the support body respectively, and a push rod mechanism connected to the scissor hinge frame and used to drive the scissor hinge frame to move so that the support body can be lifted and lowered relative to the base frame;

[0007] The lifting and lowering diagonal support assembly also includes a center adjustment pin installed on the support body, a self-aligning frame assembly connected to the wheelchair bed body and relatively rotatably installed on the center adjustment pin, and a self-aligning push rod installed on the support body and connected to the self-aligning frame assembly, which is used to adjust the rotation angle of the self-aligning frame assembly relative to the center adjustment pin through telescopic adjustment.

[0008] In the above-mentioned wheelchair bed of the present invention, the lifting diagonal support assembly comprises two protrusions respectively arranged on both sides of the support body, and the central adjustment pin is respectively inserted into the two protrusions;

[0009] The centering frame assembly includes two parallel transverse connecting members and two parallel longitudinal connecting members; the longitudinal connecting members are respectively connected to the two transverse connecting members;

[0010] The inner side of the transverse connecting member is provided with a mounting hole, and the two transverse connecting members correspond to the two ends of the central adjusting pin one by one; the transverse connecting member can be rotatably sleeved on the corresponding end of the central adjusting pin through its mounting hole;

[0011] The centering push rod includes a telescopic sleeve. One end of the sleeve is mounted on the centering frame assembly, and the other end of the sleeve is connected to the support body.

[0012] In the wheelchair bed of the present invention described above, the wheelchair bed main body includes a backrest assembly, a seat cushion assembly, a lower leg assembly, and a footrest assembly;

[0013] The wheelchair bed main body further includes a wheelchair seat frame fixedly connected to the seat cushion assembly, a pull rod, a backrest assembly end strut, and a lower leg assembly strut fixedly connected to the lower leg assembly; the backrest assembly end struts are respectively hinged to the wheelchair seat frame and the pull rod, and the lower leg assembly struts are respectively hinged to the wheelchair seat frame and the pull rod; the wheelchair seat frame, the pull rod, the backrest assembly end struts, and the lower leg assembly struts form a parallelogram mechanism;

[0014] The wheelchair bed main body further includes a pedal assembly strut fixedly connected to the footrest assembly, a pedal assembly connecting rod, and a leg fixedly installed above the centering frame assembly; the pedal assembly strut is respectively hinged to the lower leg assembly and the pedal assembly connecting rod; the leg is respectively hinged to the lower leg assembly and the pedal assembly connecting rod; the pedal assembly strut, the pedal assembly connecting rod, the leg, and the lower leg assembly form a parallelogram mechanism;

[0015] The wheelchair bed main body further includes a backrest push rod assembly, and the backrest push rod assembly includes a second mounting body rotatably mounted on the wheelchair seat frame and a second push rod body telescopically mounted on the second mounting body and connected to the backrest assembly.

[0016] In the wheelchair bed of the present invention described above, the wheelchair bed main body includes a getting-up mechanism push rod assembly; the getting-up mechanism push rod assembly includes a third mounting body rotatably mounted on the leg and a third push rod body telescopically mounted on the third mounting body and connected to the seat cushion assembly.

[0017] In the wheelchair bed of the present invention described above, the wheelchair bed main body further includes an anti-tipping wheel assembly mounted on the chassis; the anti-tipping wheel assembly includes a fixing member fixedly mounted on the chassis, and a receiving groove is formed on the fixing member; the anti-tipping wheel assembly further includes a fixed shaft fixedly disposed in the receiving groove, a shock-absorbing spring received in the receiving groove and sleeved on the fixed shaft, a mounting member mounted at the bottom of the fixing member and rotatable about the fixed shaft, and a roller rotatably mounted on the mounting member.

[0018] In the above-mentioned wheelchair bed of the present invention, the wheelchair bed further includes an armrest assembly movably mounted on the backrest assembly; there are two armrest assemblies; an armrest crank support is mounted on the backrest assembly, and the wheelchair bed further includes a U-shaped rod hingedly connected to the armrest crank support and respectively connected to the two armrest assemblies, and an armrest push rod assembly mounted on the backrest assembly for driving the U-shaped rod to rotate relative to the armrest crank support.

[0019] In the above-mentioned wheelchair bed of the present invention, the armrest assembly includes a joint member fixedly connected to the U-shaped rod, a pivot shaft rotatably mounted on the joint member, a rotating shaft vertically mounted on the pivot shaft, and an armrest main body rotatably mounted on the rotating shaft.

[0020] In the above-mentioned wheelchair bed of the present invention, the wheelchair bed further includes a driving wheel assembly and a driven wheel assembly respectively mounted on the lifting push rod assembly.

[0021] In the above-mentioned wheelchair bed of the present invention, the lifting push rod assembly further includes a longitudinal mounting beam mounted on the chassis through a connecting frame;

[0022] The driving wheel assembly includes a connector and an L-shaped connecting member; one end of the L-shaped connecting member is fixedly connected to the side surface of the connector, and the other end of the L-shaped connecting member is fixedly mounted on the bottom of the chassis through a U-shaped block; the driving wheel assembly further includes a plurality of compression springs mounted on the top surface of the connector and a pressure plate respectively supported on the plurality of compression springs, and a U-shaped groove body is mounted on the bottom of the pressure plate, and the pressure plate and the U-shaped groove body enclose a mouth-shaped frame for the longitudinal mounting beam to pass through;

[0023] The driving wheel assembly further includes a wheel power output shaft rotatably passing through the connector, a driving wheel sleeved on the wheel power output shaft, a releasable transmission shaft axially and releasably mounted on the wheel power output shaft, and a motor for driving the releasable transmission shaft to rotate.

[0024] In the above-mentioned wheelchair bed of the present invention, the releasable transmission shaft includes a pressure shaft screw, a pressure shaft bolt cover plate, a thrust bearing positioning thread ring, a wheel power input shaft, a locking nut, and a thrust bearing;

[0025] The wheel power input shaft is axially provided with a mounting groove; the thrust bearing is mounted on the pressure shaft screw through a locking nut, a thrust bearing is mounted on the pressure shaft screw, and one end of the pressure shaft screw is axially inserted into the mounting groove of the wheel power input shaft; the thrust bearing positioning thread ring is threadedly connected to the mounting groove of the wheel power input shaft, so as to limit the thrust bearing in the mounting groove of the wheel power input shaft; the pressure shaft screw is also axially threadedly connected to the pressure shaft bolt cover plate;

[0026] Another side surface of the connector is mounted with a speed reducer, and a speed reducer cover plate is mounted on the side surface of the speed reducer; the pressure shaft bolt cover plate is fixedly connected to the speed reducer cover plate, so that the pressure shaft screw and the wheel power input shaft both axially pass through the connector and the speed reducer.

[0027] The wheelchair bed of the present invention has multiple functions such as sitting posture adjustment, lying flat, and getting up, and also has functions of vibration isolation and shock absorption, multi-degree-of-freedom of the armrest, and anti-tipping. The wheelchair bed of the present invention has a novel design and strong practicability. Brief Description of the Drawings

[0028] Figure 1 Shows a schematic structural diagram of the wheelchair bed according to a preferred embodiment of the present invention;

[0029] Figure 2 Shows Figure 1 A schematic structural diagram of the lifting push rod assembly and the lifting diagonal brace assembly of the wheelchair bed shown;

[0030] Figure 3 Shows Figure 1 A reference diagram of the ergonomic use state of the wheelchair bed shown;

[0031] Figure 4 Shows Figure 1 A reference diagram of the use state of the wheelchair bed shown when going downhill;

[0032] Figure 5 Shows Figure 1 A reference diagram of the use state of the wheelchair bed shown when going uphill;

[0033] Figure 6 Shows Figure 1 A reference diagram of the use state of the wheelchair bed shown when being lifted;

[0034] Figure 7 Shows Figure 1 A reference diagram of the use state of the wheelchair bed shown when walking on flat ground;

[0035] Figure 8 Shows Figure 1 A reference diagram of the use state of the wheelchair bed shown when lying flat;

[0036] Figure 9 Shows Figure 1 A reference diagram of the use state of the wheelchair bed shown when getting up;

[0037] Figure 10 Shows Figure 1 A schematic structural diagram of the anti-tipping wheel assembly of the wheelchair bed shown;

[0038] Figure 11 Shows Figure 1 A schematic connection structure diagram of the backrest assembly and the armrest assembly of the wheelchair bed shown;

[0039] Figure 12 Shows Figure 11A schematic diagram of the structure of the handrail assembly shown;

[0040] Figure 13 Shows Figure 11 A schematic structural diagram of the handrail assembly in another direction shown;

[0041] Figure 14 Shows Figure 1 A schematic structural diagram of a driving wheel assembly of a wheelchair bed is shown;

[0042] Figure 15 Shows Figure 14 A schematic cross-sectional structure diagram of the driving wheel assembly of the wheelchair bed taken along the AA direction is shown;

[0043] Figure 16 Shows Figure 1 The schematic diagram of the connection structure of the driving wheel assembly, the base frame, the lifting push rod assembly and the lifting diagonal support assembly of the wheelchair bed shown;

[0044] Figure 17 Shows Figure 16 A partial enlarged view of section A of the wheelchair bed shown;

[0045] Figure 18 Shows Figure 16 The diagram shown is a schematic diagram of the connection structure of the driving wheel assembly, the base frame, the lifting push rod assembly and the lifting diagonal brace assembly of the wheelchair bed in another direction. DETAILED DESCRIPTION

[0046] The technical problem to be solved by the present invention is that the existing wheelchair bed has a relatively single function and cannot take into account the functions of lifting and maintaining balance when going uphill or downhill. The solution proposed by the present invention to this technical problem is to construct a wheelchair bed, which is equipped with a lifting push rod assembly for lifting the main body of the wheelchair bed and a lifting diagonal brace assembly for maintaining the balance of the main body of the wheelchair bed.

[0047] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] like Figure 1-6 As shown, Figure 1 A schematic structural diagram of a wheelchair bed according to a preferred embodiment of the present invention is shown; Figure 2 Shows Figure 1 The structural schematic diagram of the lifting push rod assembly and the lifting diagonal support assembly of the wheelchair bed shown; Figure 3 Shows Figure 1 The reference diagram of the wheelchair bed in ergonomic use state shown; Figure 4 Shows Figure 1 The reference diagram of the wheelchair bed in use when it is in a downhill state is shown; Figure 5 ShowsFigure 1 Reference diagram of the usage state of the wheelchair bed shown in the uphill state; Figure 6 Shows Figure 1 Reference diagram of the usage state of the wheelchair bed shown during lifting. The wheelchair bed includes a wheelchair bed main body, a lifting push rod assembly 15 for lifting the wheelchair bed main body, and a lifting diagonal brace assembly 7 for maintaining the balance of the wheelchair bed main body;

[0049] The lifting push rod assembly 15 includes a chassis 151, a support body 152, a scissors hinge 153 respectively connected to the chassis 151 and the support body 152, and a push rod mechanism 154 connected to the scissors hinge 153 and used to drive the scissors hinge 153 to move so that the support body 152 can be lifted or lowered relative to the chassis 151;

[0050] The lifting diagonal brace assembly 7 further includes a central adjustment pin 16 installed on the support body 152, an alignment frame assembly 14 connected to the wheelchair bed main body and rotatably installed on the central adjustment pin 16, and an alignment push rod 17 installed on the support body 152 and connected to the alignment frame assembly 14 for adjusting the rotation angle of the alignment frame assembly 14 relative to the central adjustment pin 16 by telescoping.

[0051] The above technical solution is the basic technical solution. The balance of the wheelchair bed main body is achieved by the rotation of the alignment frame assembly 14 relative to the central adjustment pin 16, and the lifting of the wheelchair bed main body is achieved by the movement of the scissors hinge 153.

[0052] Furthermore, the lifting diagonal brace assembly 7 includes two convex bodies respectively arranged on both sides of the support body 152, and the central adjustment pin 16 is respectively passed through the two convex bodies;

[0053] The alignment frame assembly 14 includes two horizontally connecting members 141 arranged in parallel and two vertically connecting members 142 arranged in parallel; the vertically connecting members 142 are respectively connected to the two horizontally connecting members 141;

[0054] Installation holes 143 are provided on the inner sides of the horizontally connecting members 141, and the two horizontally connecting members 141 correspond to the two ends of the central adjustment pin 16 one by one; the horizontally connecting members 141 are rotatably sleeved on the corresponding ends of the central adjustment pin 16 through their installation holes 143;

[0055] The alignment push rod 17 includes a telescopic sleeve 171. One end of the sleeve 171 is installed on the alignment frame assembly 14, and the other end of the sleeve 171 is connected to the support body 152.

[0056] In the above technical solution, through the telescopic sleeve 171, the rotation of the alignment frame assembly 14 relative to the central adjustment pin 16 can be achieved.

[0057] By telescoping the sleeve 171, the centering frame assembly 14 can be rotated around the central adjustment pin 16. When the sleeve 171 contracts, the centering frame assembly 14 will tilt backward, allowing people to find the most comfortable sitting position. It is also possible to adjust the telescoping of the sleeve 171 so that the wheelchair bed main body can remain horizontal when going downhill, enabling people to sit on the wheelchair bed main body and go up and down slopes smoothly.

[0058] Furthermore, the push rod mechanism 154 includes a first mounting body 155 mounted on the chassis 151 and a first push rod body 156 telescopically mounted on the first mounting body 155 and connected to the scissor hinge 153.

[0059] When the first push rod body 156 of the push rod mechanism 154 extends, it will push the lifting scissor hinge 153 upward, and thus the wheelchair bed main body will rise. When the first push rod body 156 of the push rod mechanism 154 shortens, the wheelchair bed main body can descend back to its original height. The lifting mechanism facilitates the elderly to pick up items at a relatively high position indoors and also facilitates the elderly to increase their field of vision when sitting in a wheelchair outdoors.

[0060] Furthermore, as Figures 7-8 shown, Figure 7 shows Figure 1 a reference diagram of the usage state of the wheelchair bed shown when walking on flat ground; Figure 8 shows Figure 1 a reference diagram of the usage state of the wheelchair bed shown when lying flat; The wheelchair bed main body includes a backrest assembly 1, a seat cushion assembly 20, a calf assembly 10, and a footrest assembly 11;

[0061] The wheelchair bed main body further includes a wheelchair seat frame 5 fixedly connected to the seat cushion assembly 20, a pull rod 6, a backrest assembly end support rod 61, and a calf assembly support rod 101 fixedly connected to the calf assembly 10; The backrest assembly end support rod 61 is respectively hinged to the wheelchair seat frame 5 and the pull rod 6, and the calf assembly support rod 101 is respectively hinged to the wheelchair seat frame 5 and the pull rod 6; The wheelchair seat frame 5, the pull rod 6, the backrest assembly end support rod 61, and the calf assembly support rod 101 form a parallelogram mechanism;

[0062] The wheelchair bed main body further includes a pedal assembly support rod 81 fixedly connected to the footrest assembly 11, a pedal assembly link 8, and a leg 13 fixedly installed above the centering frame assembly 14; The pedal assembly support rod 81 is respectively hinged to the calf assembly 10 and the pedal assembly link 8; The leg 13 is respectively hinged to the calf assembly 10 and the pedal assembly link 8; The pedal assembly support rod 81, the pedal assembly link 8, the leg 13, and the calf assembly 10 form a parallelogram mechanism;

[0063] The wheelchair bed main body further includes a backrest push rod assembly 12. The backrest push rod assembly 12 includes a second mounting body 121 rotatably mounted on the wheelchair seat frame 5 and a second push rod body 122 telescopically mounted on the second mounting body 121 and connected to the backrest assembly 1.

[0064] The conversion between the sitting position and the lying flat position of the wheelchair bed main body is completed by the drive of the backrest push rod assembly 12 and the transmission of two sets of parallelogram mechanisms. When the wheelchair bed main body moves on a horizontal ground, the push rod shaft of the backrest push rod assembly 12 is in a certain set position, pressing against the backrest assembly 1. When converting from one sitting position to another specific sitting position or from lying flat to a certain sitting position, the movement process is as follows: the backrest push rod assembly 12 contracts and extends, and the end strut 61 of the backrest assembly will drive the backrest and the connecting rod 6 connected by hinges to move parallelly, and then transmit the movement to the lower leg assembly 10 shared by the two sets of parallelogram mechanisms through the hinges, and then transmit the movement to the pedal assembly connecting rod 8 and finally to the support leg 13.

[0065] Further, as Figure 9 shown, Figure 9 shows Figure 1 a reference diagram of the usage state of the wheelchair bed shown in the standing-up state; the wheelchair bed main body includes a standing-up mechanism push rod assembly 18; the standing-up mechanism push rod assembly 18 includes a third mounting body 181 rotatably mounted on the support leg 13 and a third push rod body 182 telescopically mounted on the third mounting body 181 and connected to the seat cushion assembly 20.

[0066] When the wheelchair bed main body is in the lying flat state, since the support leg 13 is fixed to the centering frame assembly 14, and the wheelchair seat frame 5, the pedal assembly connecting rod 8 and the lower leg assembly 10 are connected to the support leg 13 through hinges, when the standing-up mechanism push rod assembly 18 extends, the wheelchair bed main body will rotate around the hinge of the support leg 13. When the third push rod body 182 of the standing-up mechanism push rod assembly 18 extends to the longest, the standing-up posture can be achieved. At this time, the user stands obliquely, and there may be a situation of unstable center of gravity. To avoid this situation, the wheelchair bed main body further includes an anti-tipping wheel assembly 3 mounted on the chassis 151. Preferably, there are two anti-tipping wheel assemblies 3.

[0067] Further, as Figure 10 shown, Figure 10 shows Figure 1Schematic structural diagram of the anti-tipping wheel assembly of the wheelchair bed shown; the wheelchair bed body further includes an anti-tipping wheel assembly 3 installed on the chassis 151; the anti-tipping wheel assembly 3 includes a fixing member 31 fixedly installed on the chassis 151, and a receiving groove 32 is formed on the fixing member 31; the anti-tipping wheel assembly 3 further includes a fixing shaft 33 fixedly arranged in the receiving groove 32, a shock-absorbing spring 34 accommodated in the receiving groove 32 and sleeved on the fixing shaft 33, a mounting member 35 installed at the bottom of the fixing member 31 and rotatable around the fixing shaft 33, and a roller 36 rotatably installed on the mounting member 35.

[0068] Further, as Figures 11-13 shown, Figure 11 shows Figure 1 Schematic structural diagram of the connection structure of the backrest assembly and the armrest assembly of the wheelchair bed shown; Figure 12 shows Figure 11 Schematic structural diagram of the armrest assembly shown; Figure 13 shows Figure 11 Schematic structural diagram of the armrest assembly in another direction shown; the wheelchair bed further includes an armrest assembly 2 movably installed on the backrest assembly 1; there are two armrest assemblies 2; an armrest crank support 21 is installed on the backrest assembly 1, the wheelchair bed further includes a U-shaped rod 24 hinged to the armrest crank support 21 and respectively installed and connected to the two armrest assemblies 2, and an armrest push rod assembly 25 installed on the backrest assembly 1 and used to drive the U-shaped rod 24 to rotate relative to the armrest crank support 21;

[0069] The armrest assembly 2 includes a joint member 23 fixedly connected to the U-shaped rod 24, a pivot shaft 22 rotatably installed on the joint member 23, a rotating shaft 26 vertically installed on the pivot shaft 22, and an armrest main body 27 rotatably installed on the rotating shaft 26.

[0070] Here, for safety and convenience, the armrest assembly 2 can achieve multi-degree-of-freedom movement, preventing the problem of the hand or clothes on the armrest assembly 2 being stuck during the attitude change of the wheelchair; on the other hand, it is also convenient for the elderly to stand up from the wheelchair. When the wheelchair needs to be flattened, we can also push the armrest assembly 2 outwards.

[0071] Further, the wheelchair bed further includes a driving wheel assembly 4 and a driven wheel assembly 9 respectively installed on the lifting push rod assembly 15.

[0072] As Figures 14-18 shown, Figure 14 shows Figure 1 Schematic structural diagram of the driving wheel assembly of the wheelchair bed shown; Figure 15 shows Figure 1 Schematic cross-sectional structural diagram of the driving wheel assembly of the wheelchair bed in the A-A direction shown;

[0073] Figure 16shows Figure 1 Schematic diagram of the connection structure of the drive wheel assembly, chassis, lifting push rod assembly and lifting diagonal brace assembly of the wheelchair bed shown; Figure 17 shows Figure 16 Partial enlarged view of part A of the wheelchair bed shown;

[0074] Figure 18 shows Figure 16 Schematic diagram of the connection structure of the drive wheel assembly, chassis, lifting push rod assembly and lifting diagonal brace assembly of the wheelchair bed shown in another direction; The lifting push rod assembly 15 further includes a longitudinal mounting beam 157 mounted on the chassis 151 through a connecting frame 158;

[0075] The drive wheel assembly 4 includes a connector 49 and an L-shaped connecting piece 54; One end of the L-shaped connecting piece 54 is fixedly connected to the side surface of the connector 49, and the other end of the L-shaped connecting piece 54 is fixedly mounted on the bottom of the chassis 151 through a U-shaped block 55; The drive wheel assembly 4 further includes a plurality of compression springs 50 mounted on the top surface of the connector 49 and a pressure plate 51 respectively supported on the plurality of compression springs 50. A U-shaped groove body 56 is mounted at the bottom of the pressure plate 51, and the pressure plate 51 and the U-shaped groove body 56 enclose a mouth-shaped frame for the longitudinal mounting beam 157 to pass through;

[0076] The drive wheel assembly 4 further includes a wheel power output shaft 45 rotatably passing through the connector 49, a drive wheel 48 sleeved on the wheel power output shaft 45, a releasable transmission shaft axially mounted on the wheel power output shaft 45 in a releasable manner, and a motor (not shown in the figure) for driving the releasable transmission shaft to rotate.

[0077] The releasable transmission shaft includes a pressing shaft screw 41, a pressing shaft bolt cover plate 42, a thrust bearing positioning thread ring 43, a wheel power input shaft 44, a locking nut 46, and a thrust bearing 47;

[0078] The wheel power input shaft 44 is axially provided with a mounting groove; The thrust bearing 47 is mounted on the pressing shaft screw 41 through a locking nut 46. The thrust bearing 47 is mounted on the pressing shaft screw 41, and one end of the pressing shaft screw 41 is axially inserted into the mounting groove of the wheel power input shaft 44; The thrust bearing positioning thread ring 43 is threadedly connected to the mounting groove of the wheel power input shaft 44, thereby restricting the thrust bearing 47 in the mounting groove of the wheel power input shaft 44; The pressing shaft screw 41 is also axially threadedly connected to the pressing shaft bolt cover plate 42;

[0079] Another side surface of the connector 49 is mounted with a speed reducer 53, and a speed reducer cover plate 52 is mounted on the side surface of the speed reducer 53; The pressing shaft bolt cover plate 42 is fixedly connected to the speed reducer cover plate 52, so that the pressing shaft screw 41 and the wheel power input shaft 44 both axially pass through the connector 49 and the speed reducer 53.

[0080] When the pressing shaft screw 41 is tightened, it will squeeze the thrust bearing 47, thereby pushing the wheel power input shaft 44 to move inward, making it squeeze against the conical surface of the wheel power output shaft 45, and the power can be transmitted to the wheel power output shaft 45 through the conical surface friction. When the pressing shaft screw 41 is loosened, the locking nut 46 will squeeze the thrust bearing 47, and the wheel power output shaft 45 will be separated from the wheel power input shaft 44. At this time, the rotation of the drive wheel 48 is not affected by the motor. The purpose of setting the releasable transmission shaft is that when the battery that powers the motor runs out of energy or fails, the wheelchair bed can still be pushed forward by loosening the pressing shaft screw 41, that is, the manual and electric modes can be switched mutually. In addition, the shock isolation and damping function is realized by compressing the spring 50.

[0081] The wheelchair bed of the present invention has multiple functions such as sitting posture adjustment, lying flat, getting up, etc., and also has functions of shock isolation and damping, multi-degree of freedom of the armrest, and anti-backward tipping. The wheelchair bed of the present invention has a novel design and strong practicability.

[0082] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wheelchair bed, characterized in that, it includes a wheelchair bed main body, a lifting push rod assembly (15) for lifting the wheelchair bed main body, and a lifting diagonal brace assembly (7) for maintaining the balance of the wheelchair bed main body; The lifting push rod assembly (15) includes a chassis (151), a support body (152), a scissors hinge frame (153) respectively connected to the chassis (151) and the support body (152), and a push rod mechanism (154) connected to the scissors hinge frame (153) and used to drive the scissors hinge frame (153) to move so that the support body (152) can move up and down relative to the chassis (151); The lifting diagonal brace assembly (7) further includes a central adjustment pin (16) installed on the support body (152), an alignment frame assembly (14) connected to the wheelchair bed main body and rotatably installed on the central adjustment pin (16), and an alignment push rod (17) installed on the support body (152) and connected to the alignment frame assembly (14) for adjusting the rotation angle of the alignment frame assembly (14) relative to the central adjustment pin (16) by telescoping; The lifting push rod assembly (15) further includes a longitudinal installation beam (157) installed on the chassis (151) through a connecting frame (158); The drive wheel assembly (4) includes a connector (49) and an L-shaped connecting piece (54); one end of the L-shaped connecting piece (54) is fixedly connected to the side surface of the connector (49), and the other end of the L-shaped connecting piece (54) is fixedly installed at the bottom of the chassis (151) through a U-shaped block (55); the drive wheel assembly (4) further includes a plurality of compression springs (50) installed on the top surface of the connector (49) and a pressure plate (51) respectively supported on the plurality of compression springs (50), a U-shaped groove body (56) is installed at the bottom of the pressure plate (51), and an opening frame for the longitudinal installation beam (157) to pass through is formed by the pressure plate (51) and the U-shaped groove body (56); The drive wheel assembly (4) further includes a wheel power output shaft (45) rotatably passing through the connector (49), a drive wheel (48) sleeved on the wheel power output shaft (45), a releasable transmission shaft axially installed on the wheel power output shaft (45) in a releasable manner, and a motor for driving the releasable transmission shaft to rotate; The wheelchair bed further includes a drive wheel assembly (4) and a driven wheel assembly (9) respectively installed on the lifting push rod assembly (15).

2. The wheelchair bed according to claim 1, characterized in that, the lifting diagonal brace assembly (7) includes two convex bodies respectively arranged on both sides of the support body (152), and the central adjustment pin (16) respectively passes through the two convex bodies; the alignment frame assembly (14) includes two horizontally arranged transverse connecting pieces (141) and two longitudinally arranged longitudinal connecting pieces (142); the longitudinal connecting pieces (142) are respectively connected to the two transverse connecting pieces (141); installation holes (143) are formed on the inner sides of the transverse connecting pieces (141), and the two transverse connecting pieces (141) correspond to the two ends of the central adjustment pin (16) one by one; the transverse connecting pieces (141) are rotatably sleeved on the corresponding ends of the central adjustment pin (16) through their installation holes (143); The self-aligning push rod (17) includes a telescopic sleeve (171). One end of the sleeve (171) is installed on the self-aligning frame assembly (14), and the other end of the sleeve (171) is connected to the support body (152).

3. The wheelchair bed according to claim 1, characterized in that, the wheelchair bed main body includes a backrest assembly (1), a seat cushion assembly (20), a lower leg assembly (10), and a footrest assembly (11); the wheelchair bed main body further includes a wheelchair seat frame (5) fixedly connected to the seat cushion assembly (20), a pull rod (6), a backrest assembly end support rod (61), and a lower leg assembly support rod (101) fixedly connected to the lower leg assembly (10); the backrest assembly end support rod (61) is respectively hinged to the wheelchair seat frame (5) and the pull rod (6), and the lower leg assembly support rod (101) is respectively hinged to the wheelchair seat frame (5) and the pull rod (6); the wheelchair seat frame (5), the pull rod (6), the backrest assembly end support rod (61), and the lower leg assembly support rod (101) form a parallelogram mechanism; the wheelchair bed main body further includes a pedal assembly support rod (81) fixedly connected to the footrest assembly (11), a pedal assembly connecting rod (8), and a leg (13) fixedly installed above the self-aligning frame assembly (14); the pedal assembly support rod (81) is respectively hinged to the lower leg assembly (10) and the pedal assembly connecting rod (8); the leg (13) is respectively hinged to the lower leg assembly (10) and the pedal assembly connecting rod (8); the pedal assembly support rod (81), the pedal assembly connecting rod (8), the leg (13), and the lower leg assembly (10) form a parallelogram mechanism; the wheelchair bed main body further includes a backrest push rod assembly (12), and the backrest push rod assembly (12) includes a second mounting body (121) rotatably installed on the wheelchair seat frame (5) and a second push rod body (122) telescopically installed on the second mounting body (121) and connected to the backrest assembly (1).

4. The wheelchair bed according to claim 3, characterized in that, the wheelchair bed main body includes a getting-up mechanism push rod assembly (18); the getting-up mechanism push rod assembly (18) includes a third mounting body (181) rotatably installed on the leg (13) and a third push rod body (182) telescopically installed on the third mounting body (181) and connected to the seat cushion assembly (20).

5. The wheelchair bed according to claim 1, characterized in that, the wheelchair bed main body further includes an anti-tipping wheel assembly (3) installed on the chassis (151); the anti-tipping wheel assembly (3) includes a fixing member (31) fixedly installed on the chassis (151), and a receiving groove (32) is formed on the fixing member (31); the anti-tipping wheel assembly (3) further includes a fixing shaft (33) fixedly arranged in the receiving groove (32), a shock-absorbing spring (34) received in the receiving groove (32) and sleeved on the fixing shaft (33), a mounting member (35) installed at the bottom of the fixing member (31) and rotatable around the fixing shaft (33), and a roller (36) rotatably installed on the mounting member (35).

6. The wheelchair bed according to claim 3, characterized in that, The wheelchair bed further includes an armrest assembly (2) movably mounted on the backrest assembly (1); there are two armrest assemblies (2); an armrest crank support (21) is mounted on the backrest assembly (1), and the wheelchair bed further includes a U-shaped rod (24) hinge-connected to the armrest crank support (21) and respectively connected to the two armrest assemblies (2), and an armrest push rod assembly (25) mounted on the backrest assembly (1) for driving the U-shaped rod (24) to rotate relative to the armrest crank support (21).

7. The wheelchair bed according to claim 6, characterized in that, the armrest assembly (2) includes a joint member (23) fixedly connected to the U-shaped rod (24), a pivot shaft (22) rotatably mounted on the joint member (23), a rotating shaft (26) vertically mounted on the pivot shaft (22), and an armrest main body (27) rotatably mounted on the rotating shaft (26).

8. The wheelchair bed according to claim 1, characterized in that, the releasable transmission shaft includes a pressure shaft screw (41), a pressure shaft bolt cover plate (42), a thrust bearing positioning thread ring (43), a wheel power input shaft (44), a locking nut (46), and a thrust bearing (47); the wheel power input shaft (44) is axially provided with a mounting groove; the thrust bearing (47) is mounted on the pressure shaft screw (41) through the locking nut (46), the thrust bearing (47) is mounted on the pressure shaft screw (41), and one end of the pressure shaft screw (41) is axially inserted into the mounting groove of the wheel power input shaft (44); the thrust bearing positioning thread ring (43) is threadedly connected to the mounting groove of the wheel power input shaft (44), so as to limit the thrust bearing (47) in the mounting groove of the wheel power input shaft (44); the pressure shaft screw (41) is also threadedly connected to the pressure shaft bolt cover plate (42) axially; the other side of the connector (49) is mounted with a speed reducer (53), and the side of the speed reducer (53) is mounted with a speed reducer cover plate (52); the pressure shaft bolt cover plate (42) is fixedly connected to the speed reducer cover plate (52), so that the pressure shaft screw (41) and the wheel power input shaft (44) both axially pass through the connector (49) and the speed reducer (53).

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