A variable-distance, high-stability wheelchair for the elderly suitable for slopes

Abstract

The present invention discloses a variable-distance, high-stability wheelchair for the elderly suitable for use on sloped surfaces. The present invention relates to the technical field of wheelchairs for the elderly, comprising an arcuate guide rail, the surface of which is fixedly mounted on the inner side of a frame, the inner side of which is slidably connected to a rotating assembly, the surface of which is fixedly connected to a special-shaped rod, the bottom of which is fixedly connected to an adjustment assembly, and the driving assembly is used to drive the rotating assembly to slide on the inner side of the arcuate guide rail. The variable-distance, high-stability wheelchair for the elderly suitable for use on sloped surfaces achieves a result in which the adjustment assembly is driven to move obliquely upward, thereby increasing the distance between the adjustment assembly and the front wheel, lowering the center of gravity of the frame, and bringing the center of gravity closer to the slope when the wheelchair goes uphill, thereby making the wheelchair more stable when going uphill. This solves the problem of a wheelchair easily tipping over when going uphill due to a small distance between the front and rear wheels.

Description

Technical Field

[0001] The present invention relates to the technical field of wheelchairs for the elderly, and in particular to a variable-distance, high-stability wheelchair for the elderly suitable for slopes. Background Art

[0002] Wheelchairs are commonly used assistive devices for people with lower limb mobility problems. The center of gravity of wheelchairs is relatively high when in use. When the road surface is uneven, or people with cognitive impairments are often restless in wheelchairs, wheelchairs are prone to tilting. The width of the disabled passage is basically fixed. With the development of technology, electric wheelchairs that can climb stairs and slopes have appeared. The center of gravity of this type of wheelchair is relatively high, and its center of gravity will rise further when climbing slopes. A slight shake of the patient's body may cause a large change in the overall center of gravity, which can easily cause the wheelchair to tip over. The patient himself has no mobility. Once the wheelchair tips over, if no one else rescues him, the patient will be in danger of life. The contact area between the tracks and the stairs is small and cannot be adjusted according to the actual ground conditions. The tracks are prone to slipping, endangering the patient's life. Chinese patent number: CN112336538A discloses "A balanced wheelchair". In this patent, the suspension balancing mechanism is connected to the balancing roller installed on the surface of the wheelchair fixing frame through a balancing belt. The balancing roller is connected to the movable roller installed inside the auxiliary balancing mechanism through the balancing belt. The tension between the balancing roller and the movable roller is adjusted by the balancing belt, so that the vertical loads of the two auxiliary balancing mechanisms are equal under any circumstances, and individual wheels will not be left hanging in the air, which has a good balancing adjustment effect and ensures the smooth movement of the wheelchair.

[0003] Existing variable-distance, high-stability wheelchairs for the elderly suitable for slopes have structural design defects, such as a small distance between the front and rear wheels, which makes the wheelchair prone to tipping over when going uphill, and a problem of the wheelchair's center of gravity being too low when climbing a slope, which can easily lead to insufficient friction on the front wheels and cause the wheelchair to tip over. Summary of the Invention

[0004] The present invention provides a variable-distance, high-stability wheelchair for the elderly suitable for slopes, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a variable-distance, high-stability wheelchair for the elderly suitable for use on sloped surfaces, comprising a frame, a bending rod fixedly connected to an upper position of the frame surface, a front wheel rotatably connected to a lower position of the frame surface, and a rear push frame fixedly connected to a position of the frame surface away from the front wheel; and further comprising:

[0006] A pitch-changing mechanism, the pitch-changing mechanism being fixedly mounted on an inner side of the frame at a position away from the front wheel, the pitch-changing mechanism being used to increase the wheelbase of the wheelchair when climbing a slope, and a driving assembly being fixedly connected to a position on the inner side of the frame near the pitch-changing mechanism;

[0007] A forward tilting mechanism, which is fixedly mounted on the upper side of the inner side of the frame and is used to push the user forward when climbing a slope and to cushion vibrations during the movement of the wheelchair;

[0008] The pitch-changing mechanism includes an arc-shaped guide rail, the surface of which is fixedly mounted on the inner side of the frame, the inner side of the arc-shaped guide rail is slidably connected to a rotating assembly, the surface of the rotating assembly is fixedly connected to a special-shaped rod, the bottom of the special-shaped rod is fixedly connected to an adjusting assembly, the driving assembly is used to drive the rotating assembly to slide on the inner side of the arc-shaped guide rail, and the adjusting assembly is used to change the wheelbase of the wheelchair when climbing a slope.

[0009] Preferably, there are two special-shaped rods, and the inner sides of the two special-shaped rods are fixedly connected to a rotating shaft, and the position of the rotating shaft surface close to the end face is rotatably connected to the upper position of the inner side surface of the frame, and the upper position of the special-shaped rod surface is fixedly connected to a rubber tube. The user sits at the upper position of the forward tilt mechanism, and when the wheelchair walks on flat ground, the front wheel and the rear wheel are at a normal distance. At this time, the center of gravity of the frame is higher, and the user has a better riding experience. When climbing a slope, the second motor drives the worm to rotate, and the surface of the worm engages with the surface of the rotating assembly. The rotation of the worm causes the rotating assembly to slide on the inner side surface of the arc guide rail. Since the lower position of the special-shaped rod surface passes through and is fixedly installed on the inner side surface of the rotating assembly, the special-shaped rod rotates and deflects upward with the axis of the rotating shaft as the center, and the axis of the arc guide rail is collinear with the axis of the rotating shaft.

[0010] Preferably, the rotating assembly includes a tile-shaped plate, a surface of the tile-shaped plate is fixedly connected to an arc-shaped slider, a surface of the arc-shaped slider is rotatably connected to a cylinder, and a surface of the tile-shaped plate is fixedly connected to a cross-section worm gear.

[0011] Preferably, there are two arc-shaped sliders, and the two arc-shaped sliders are symmetrically distributed with the tile-shaped plate as the center. The surface of the cylinder is rollingly connected to the inner side of the arc-shaped guide rail. There are multiple cross-sectional worm gears. The support rod and the support frame support and limit the worm. The top of the worm is above the top of the support frame. When the worm drives the cross-sectional worm gear to rotate, the support frame will not collide with the cross-sectional worm gear. When climbing a slope, the cross-sectional worm gear rotates upward driven by the worm, and multiple cylinders roll on the inner side of the arc-shaped guide rail. The rolling friction of the cylinder is used to replace the sliding friction of the arc-shaped slider, which can effectively avoid jamming due to excessive friction resistance, making the wheelchair more stable when changing distance.

[0012] Preferably, the driving assembly includes a support rod, the end face of the support rod is fixedly installed at a lower position on the inner side of the frame, the middle position of the surface of the support rod is fixedly connected to a support frame, the upper position of the surface of the support frame is fixedly connected to a second motor, and the output end of the second motor is fixedly connected to a worm gear.

[0013] Preferably, the adjusting assembly includes a fixing rod, the surface of the fixing rod is fixedly mounted on the bottom end of the special-shaped rod, the end surface position of the fixing rod is fixedly connected to a screw slide, and the position between the screw slide and the special-shaped rod is fixedly connected to a stable body. The user sits on the top of the seat plate, steps on the upper position of the footrest, and the back is supported by the backrest board. The bending rod provides protective support for the side of the user's body. The adjusting assembly provides power to cooperate with the rotation of the front wheel to make the frame move forward. When going uphill, the driving assembly drives the rotating assembly to rotate, and the rotating assembly slides upward on the inner side of the arc guide rail. The connection support of the special-shaped rod makes the adjusting assembly rotate upward with the rotating axis as the center. At the same time, the bottom of the adjusting assembly slides downward, thereby increasing the wheelbase between the adjusting assembly and the front wheel, making the wheelchair more stable when going uphill.

[0014] Preferably, the adjustment assembly further includes a first motor, the surface of the first motor is fixedly mounted on the output end of the screw slide, and the output end of the first motor is fixedly connected to the rear wheel.

[0015] Preferably, the tilting mechanism includes a fixing plate, the surface of which is fixedly mounted on an upper position of the inner side of the frame, the top of the fixing plate is fixedly connected to a buffer assembly, and the top of the buffer assembly is fixedly connected to a seat plate. When going uphill, the distance between the front wheel and the rear wheel increases, making the wheelchair more stable when going uphill. At the same time, the electric cylinder pushes the tilting plate toward the user's back, and the tilting plate makes the user lean forward, and the center of gravity of the user and the wheelchair is close to the front wheel. The fixing plate firmly supports and limits the fixed wall, and the sealing cover is made of rubber material. The interior of the fixed wall is poured with molten rubber, and the rubber fills the gap between the fixed wall and the spring sheet after solidification.

[0016] Preferably, the forward tilting mechanism further includes a foot frame, the top of the foot frame is fixedly mounted on the surface of the seat plate, the side of the seat plate away from the foot frame is fixedly connected to a backrest plate, and the surface of the backrest plate is fixedly connected to a pushing assembly.

[0017] Preferably, the buffer assembly includes a fixed wall, the bottom of the fixed wall is fixedly mounted on the top of the fixed plate, the top of the fixed wall is fixedly connected to a sealing cover, the inner side of the fixed wall is fixedly connected to a spring sheet, the top of the fixed wall is fixedly connected to a connecting cylinder, and the stabilizing body makes the connection between the screw slide and the special-shaped rod more stable and reliable, the special-shaped rod deflects upward, and the screw slide drives the first motor to move along the direction of the special-shaped rod, so that the distance between the front wheel and the rear wheel is stably adjusted, and the inner side of the backrest plate supports and slides the piston rod at the output end of the electric cylinder, and the plastic plate is a bent plate structure supported by plastic material.

[0018] Preferably, the pushing assembly includes a bending plate, the surface of the bending plate is fixedly mounted on the surface of the backrest plate, the surface of the bending plate is fixedly connected to an electric cylinder, the output end of the electric cylinder is fixedly connected to a tilting plate, and a plastic plate is fixedly connected to the position between the bottom of the tilting plate and the backrest plate.

[0019] The present invention provides a variable-distance, high-stability wheelchair for the elderly suitable for use on slopes. It has the following beneficial effects:

[0020] 1. This variable-distance, high-stability wheelchair is suitable for elderly people riding on slopes. The adjustment component is driven to move diagonally upward, which increases the distance between the adjustment component and the front wheel, lowers the center of gravity of the frame, and brings the center of gravity closer to the slope when the wheelchair goes uphill, making the wheelchair more stable when going uphill. This solves the problem of the wheelchair easily tipping over when going uphill due to the small distance between the front and rear wheels.

[0021] 2. This variable-distance, high-stability wheelchair for the elderly, which is suitable for use on sloped surfaces, has a screw slide that drives the first motor to slide downward, so that the distance between the rear wheel and the front wheel is adjusted to increase, while the inclination angle between the user and the ground does not change. The device is equipped with multiple-section worm gears, which makes the tile-shaped plate more stable when rotating upward. At the same time, when the worm stops rotating, the multiple-section worm gears have a better stopping effect on the worm, thereby making the distance between the front wheel and the rear wheel more stable when adjusting.

[0022] 3. This variable-distance, high-stability wheelchair is suitable for the elderly on slopes. The buffer component cushions the shaking of the wheelchair when it moves. The seat plate is located in the front of the frame. When going uphill, the pushing component pushes the user to lean forward, and the center of gravity of the user and the wheelchair tilts forward, thereby preventing the wheelchair from tipping over due to insufficient friction of the front wheels when climbing a slope. This solves the problem of the wheelchair tipping over due to insufficient friction of the front wheels when climbing a slope due to the low center of gravity.

[0023] 4. This variable-distance, high-stability wheelchair is suitable for the elderly on slopes. A rubber sealing cover fixes and supports the connecting tube. When the front and rear wheels rotate, the frame moves forward to climb the slope. When the climbing road is uneven, the frame is vibrated. At this time, the solidified rubber inside the fixed wall converts the vibration into elastic potential energy, and the metal spring sheet increases the deformation resistance of the solidified rubber. The fixed wall and the seat plate are supported less, thereby effectively cushioning the large area of ​​the seat plate, effectively improving the stability of the wheelchair during use.

[0024] 5. This variable-distance, high-stability wheelchair is suitable for the elderly on slopes. The elasticity of the plastic plate prevents the user from receiving a rigid impact force when leaning forward. At the same time, the forward tilt plate can support and protect the user after leaning forward due to the traction of the plastic plate. When going uphill, the electric cylinder pushes the user's body to lean forward. At this time, the special-shaped rod deflects upward with the rotation axis as the center, and the position of the special-shaped rod close to the rubber tube deflects downward. The bending plate supports and limits multiple electric cylinders. When the user leans forward, the hand holding the rubber tube moves forward with the special-shaped rod. At this time, the special-shaped rod supports and protects the user from leaning forward, making it safer for the user when climbing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the top of the variable-distance, high-stability wheelchair for the elderly suitable for use on sloped surfaces according to the present invention;

[0026] Figure 2 A three-dimensional diagram of the bottom of the variable-distance, high-stability wheelchair for the elderly suitable for use on sloped surfaces according to the present invention;

[0027] Figure 3 This is a schematic diagram of the structural connection between the pitch-changing mechanism and the driving assembly of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the rotating assembly of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the regulating assembly of the present invention;

[0030] Figure 6 Schematic diagram of the structure of the forward tilting mechanism of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the buffer assembly of the present invention;

[0032] Figure 8 It is a structural schematic diagram of the driving component of the present invention.

[0033] In the figure: 1, frame; 2, bending rod; 3, front wheel; 4, rear push frame; 5, pitch change mechanism; 51, curved guide rail; 52, rotating shaft; 53, special-shaped rod; 54, rubber tube; 55, rotating assembly; 551, tile plate; 552, curved slider; 553, cylinder; 554, cross-section worm gear; 56, adjustment assembly; 561, fixing rod; 562, stabilizing body; 563, screw slide; 564, first motor; 565, rear Wheel; 6. Driving assembly; 61. Support rod; 62. Support frame; 63. Second motor; 64. Worm; 7. Tilt mechanism; 71. Fixed plate; 72. Buffer assembly; 721. Fixed wall; 722. Spring sheet; 723. Sealing cover; 724. Connecting tube; 73. Seat plate; 74. Tripod; 75. Backrest plate; 76. Pushing assembly; 761. Bending plate; 762. Electric cylinder; 763. Plastic plate; 764. Tilt plate. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] First embodiment: Figure 1-Figure 3 As shown, the present invention provides a technical solution: a variable-distance, high-stability wheelchair for the elderly suitable for use on sloped surfaces, comprising a frame 1, a bending rod 2 fixedly connected to the upper position of the frame 1 surface, a front wheel 3 rotatably connected to the lower position of the frame 1 surface, and a rear push frame 4 fixedly connected to the position of the frame 1 surface away from the front wheel 3; and further comprising:

[0036] The pitch changing mechanism 5 is fixedly mounted on the inner side of the frame 1 at a position away from the front wheel 3. The pitch changing mechanism 5 is used to increase the wheelbase of the wheelchair when climbing a slope. A driving assembly 6 is fixedly connected to the inner side of the frame 1 near the pitch changing mechanism 5;

[0037] The forward tilting mechanism 7 is fixedly mounted on the upper position of the inner side surface of the frame 1. The forward tilting mechanism 7 is used to push the user to tilt forward when climbing a slope and to cushion the vibration during the movement of the wheelchair;

[0038] The pitch-changing mechanism 5 includes an arc-shaped guide rail 51, the surface of which is fixedly mounted on the inner side of the frame 1. A rotating assembly 55 is slidably connected to the inner side of the arc-shaped guide rail 51. A special-shaped rod 53 is fixedly connected to the surface of the rotating assembly 55. An adjusting assembly 56 is fixedly connected to the bottom of the special-shaped rod 53. The driving assembly 6 is used to drive the rotating assembly 55 to slide on the inner side of the arc-shaped guide rail 51. The adjusting assembly 56 is used to change the wheelchair's wheelbase when climbing a slope.

[0039] There are two special-shaped rods 53, and the inner side surfaces of the two special-shaped rods 53 are fixedly connected to the rotating shaft 52. The surface of the rotating shaft 52 near the end surface is rotatably connected to the upper position of the inner side surface of the frame 1. The upper position of the surface of the special-shaped rod 53 is fixedly connected to the rubber tube 54.

[0040] The driving component 6 includes a support rod 61, the end face of the support rod 61 is fixedly installed at the lower position of the inner side surface of the frame 1, the middle position of the surface of the support rod 61 is fixedly connected to the support frame 62, the upper position of the surface of the support frame 62 is fixedly connected to the second motor 63, and the output end of the second motor 63 is fixedly connected to the worm 64.

[0041] When in use, the user sits above the forward tilting mechanism 7. When the wheelchair is walking on flat ground, the front wheel 3 and the rear wheel 565 are at a normal distance. At this time, the center of gravity of the frame 1 is higher, and the user has a better riding experience. When climbing a slope, the second motor 63 drives the worm 64 to rotate. The surface of the worm 64 engages with the surface of the rotating assembly 55. The rotation of the worm 64 causes the rotating assembly 55 to slide on the inner side surface of the arc guide rail 51. Since the lower position of the surface of the special-shaped rod 53 passes through and is fixedly installed on the inner side surface of the rotating assembly 55, the special-shaped rod 53 rotates and deflects upward with the axis of the rotating shaft 52 as the center. The axis of the arc guide rail 51 is collinear with the axis of the rotating shaft 52, and the adjusting assembly 56 is driven to move obliquely upward, so that the distance between the adjusting assembly 56 and the front wheel 3 is increased, and the center of gravity of the frame 1 is lowered. When the wheelchair goes uphill, the center of gravity is closer to the slope, thereby making the wheelchair more stable when going uphill, solving the problem that the distance between the front and rear wheels of the wheelchair is too small, and the wheelchair is easy to tip over when going uphill, causing danger.

[0042] Second embodiment: Figure 3 、 Figure 4 、 Figure 5 As shown, the rotating assembly 55 includes a tile-shaped plate 551, a curved slider 552 is fixedly connected to the surface of the tile-shaped plate 551, a cylinder 553 is rotatably connected to the surface of the curved slider 552, a cross-sectional worm gear 554 is fixedly connected to the surface of the tile-shaped plate 551, there are two curved sliders 552, and the two curved sliders 552 are symmetrically distributed around the tile-shaped plate 551, the surface of the cylinder 553 is in rolling connection with the inner side surface of the curved guide rail 51, and there are multiple cross-sectional worm gears 554;

[0043] The adjusting component 56 includes a fixed rod 561, the surface of the fixed rod 561 is fixedly mounted on the bottom end of the special-shaped rod 53, the end surface position of the fixed rod 561 is fixedly connected to a screw slide 563, the position between the screw slide 563 and the special-shaped rod 53 is fixedly connected to a stabilizing body 562, the adjusting component 56 also includes a first motor 564, the surface of the first motor 564 is fixedly mounted on the output end of the screw slide 563, and the output end of the first motor 564 is fixedly connected to a rear wheel 565.

[0044] When in use, the support rod 61 and the support frame 62 support and limit the worm 64. The top of the worm 64 is above the top of the support frame 62. When the worm 64 drives the cross-section worm wheel 554 to rotate, the support frame 62 will not collide with the cross-section worm wheel 554. When climbing a slope, the cross-section worm wheel 554 rotates upward under the drive of the worm 64. Multiple cylinders 553 roll on the inner side of the arc guide rail 51. The rolling friction of the cylinder 553 replaces the sliding friction of the arc slider 552, which can effectively avoid excessive friction resistance and jamming. , making the wheelchair more stable when changing distance, the screw slide 563 drives the first motor 564 to slide downward, so that the distance between the rear wheel 565 and the front wheel 3 is adjusted to increase, while the inclination angle between the user and the ground does not change. The device is provided with multiple cross-section worm gears 554, so that the tile-shaped plate 551 is more stable when rotating upward. At the same time, when the worm 64 stops rotating, the multiple cross-section worm gears 554 have a better stopping effect on the worm 64, thereby making the distance between the front wheel 3 and the rear wheel 565 more stable when adjusting.

[0045] The third embodiment: Figure 3 、 Figure 6 As shown, the inner side surface of the curved guide rail 51 is slidably connected to a rotating assembly 55, the surface of the rotating assembly 55 is fixedly connected to a special-shaped rod 53, and the bottom of the special-shaped rod 53 is fixedly connected to an adjustment assembly 56. The driving assembly 6 is used to drive the rotating assembly 55 to slide on the inner side surface of the curved guide rail 51, and the adjustment assembly 56 is used to change the wheelchair wheelbase when climbing a slope;

[0046] There are two special-shaped rods 53, and the inner sides of the two special-shaped rods 53 are fixedly connected with a rotating shaft 52. The surface of the rotating shaft 52 is rotatably connected to the upper position of the inner side of the frame 1 near the end face. The upper position of the surface of the special-shaped rod 53 is fixedly connected with a rubber tube 54. The forward tilting mechanism 7 includes a fixed plate 71. The surface of the fixed plate 71 is fixedly installed at the upper position of the inner side of the frame 1. The top of the fixed plate 71 is fixedly connected with a buffer assembly 72. The top of the buffer assembly 72 is fixedly connected with a seat plate 73. The forward tilting mechanism 7 also includes a foot frame 74. The top of the foot frame 74 is fixedly installed on the surface of the seat plate 73. The side of the seat plate 73 away from the foot frame 74 is fixedly connected with a backrest plate 75. The surface of the backrest plate 75 is fixedly connected with a pushing assembly 76.

[0047] When in use, the user sits on the top of the seat plate 73, steps on the upper position of the footrest 74, and the back is supported by the backrest plate 75. The bending rod 2 provides protection and support for the side of the user's body. The adjustment component 56 provides power and cooperates with the rotation of the front wheel 3 to make the frame 1 move forward. When going uphill, the driving component 6 drives the rotating component 55 to rotate. The rotating component 55 slides upward on the inner side of the arc guide rail 51. The connection support of the special-shaped rod 53 makes the adjustment component 56 rotate upward with the rotating shaft 52 as the center. At the same time, the bottom of the adjustment component 56 slides downward, thereby increasing the wheelbase between the adjustment component 56 and the front wheel 3, making the wheelchair more stable when going uphill. The buffer component 72 buffers the shaking of the wheelchair when moving. The seat plate 73 is located in the front of the frame 1. When going uphill, the pushing component 76 pushes the user to lean forward, and the center of gravity of the user and the wheelchair tilts forward, thereby preventing the wheelchair from tipping over due to too little friction of the front wheel 3 when climbing a slope, solving the problem that the wheelchair can easily tip over due to too little friction of the front wheel when climbing a slope.

[0048] Fourth embodiment: Figure 6 、 Figure 7 、 Figure 8 As shown, the buffer assembly 72 includes a fixed wall 721, the bottom of the fixed wall 721 is fixedly mounted on the top of the fixed plate 71, the top of the fixed wall 721 is fixedly connected to a sealing cover 723, the inner side surface of the fixed wall 721 is fixedly connected to a spring sheet 722, the top of the fixed wall 721 is fixedly connected to a connecting tube 724, the pushing assembly 76 includes a bending plate 761, the surface of the bending plate 761 is fixedly mounted on the surface of the backrest plate 75, the surface of the bending plate 761 is fixedly connected to an electric cylinder 762, the output end of the electric cylinder 762 is fixedly connected to a forward tilting plate 764, and the position between the bottom of the forward tilting plate 764 and the backrest plate 75 is fixedly connected to a plastic plate 763.

[0049] When in use, when going uphill, the distance between the front wheel 3 and the rear wheel 565 increases, making the wheelchair more stable when going uphill. At the same time, the electric cylinder 762 pushes the tilting plate 764 to move toward the user's back, and the tilting plate 764 makes the user lean forward, and the center of gravity of the user and the wheelchair is close to the front wheel 3. The fixing plate 71 firmly supports and limits the fixing wall 721. The sealing cover 723 is made of rubber material. The interior of the fixing wall 721 is poured with molten rubber. After the rubber solidifies, it fills the gap between the fixing wall 721 and the spring sheet 722. The rubber material The sealing cover 723 made of metal provides fixed support for the connecting tube 724. When the front wheel 3 and the rear wheel 565 rotate, the frame 1 moves forward to climb the slope. When the climbing road is uneven, the frame 1 is vibrated. At this time, the solidified rubber inside the fixed wall 721 converts the vibration into elastic potential energy, and the metal spring sheet 722 increases the deformation resistance of the solidified rubber. The fixed wall 721 and the seat plate 73 are less supported, thereby effectively absorbing the vibration of the large area of ​​the seat plate 73, effectively improving the stability of the wheelchair when in use.

[0050] Fifth embodiment: Figure 5 、 Figure 8 As shown, the surface of the fixed rod 561 is fixedly mounted on the bottom end of the special-shaped rod 53, the end surface position of the fixed rod 561 is fixedly connected to the screw slide 563, the position between the screw slide 563 and the special-shaped rod 53 is fixedly connected to the stabilizing body 562, the adjustment component 56 also includes a first motor 564, the surface of the first motor 564 is fixedly mounted on the output end of the screw slide 563, the output end of the first motor 564 is fixedly connected to the rear wheel 565, the surface of the bending plate 761 is fixedly mounted on the surface of the backrest plate 75, the surface of the bending plate 761 is fixedly connected to the electric cylinder 762, the output end of the electric cylinder 762 is fixedly connected to the tilt plate 764, and the position between the bottom of the tilt plate 764 and the backrest plate 75 is fixedly connected to the plastic plate 763.

[0051] When in use, the stabilizing body 562 makes the connection between the screw slide 563 and the special-shaped rod 53 more stable and reliable. The special-shaped rod 53 deflects upward, and the screw slide 563 drives the first motor 564 to move along the direction of the special-shaped rod 53, so that the distance between the front wheel 3 and the rear wheel 565 is stably adjusted. The inner side of the backrest plate 75 supports and slides against the piston rod at the output end of the electric cylinder 762. The plastic plate 763 is a bent plate structure supported by plastic material. The elasticity of the plastic plate 763 prevents the user from receiving a rigid impact force when leaning forward. At the same time, The plastic plate 763 is pulled, and the forward tilting plate 764 can support and protect the user after leaning forward. When going uphill, the electric cylinder 762 pushes the user's body to lean forward. At this time, the special-shaped rod 53 deflects upward with the rotating shaft 52 as the center, and the position of the special-shaped rod 53 close to the rubber tube 54 deflects downward. The bending plate 761 supports and limits multiple electric cylinders 762. When the user leans forward, the hand holding the rubber tube 54 moves forward with the special-shaped rod 53. At this time, the special-shaped rod 53 supports and protects the user from leaning forward, thereby making the user safer when climbing.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "including an element defined by..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element."

Claims

1. A variable-distance high-stability wheelchair for the elderly suitable for use on sloped surfaces, comprising a frame (1), a bending rod (2) fixedly connected to an upper position of the frame (1) surface, a front wheel (3) rotatably connected to a lower position of the frame (1) surface, and a rear push frame (4) fixedly connected to a position of the frame (1) surface away from the front wheel (3); characterized in that: Also includes: A pitch changing mechanism (5), the pitch changing mechanism (5) being fixedly mounted on the inner side of the frame (1) at a position away from the front wheel (3), the pitch changing mechanism (5) being used to increase or decrease the wheelbase of the wheelchair when climbing a slope, and a driving assembly (6) being fixedly connected to a position of the inner side of the frame (1) near the pitch changing mechanism (5); A forward tilting mechanism (7), the forward tilting mechanism (7) being fixedly mounted at an upper position on the inner side surface of the frame (1), the forward tilting mechanism (7) being used for pushing the user to tilt forward when climbing a slope and for buffering vibrations during movement of the wheelchair; The pitch-changing mechanism (5) comprises an arc-shaped guide rail (51), the surface of the arc-shaped guide rail (51) is fixedly mounted on the inner side surface of the frame (1), the inner side surface of the arc-shaped guide rail (51) is slidably connected to a rotating assembly (55), the surface of the rotating assembly (55) is fixedly connected to a special-shaped rod (53), the bottom of the special-shaped rod (53) is fixedly connected to an adjusting assembly (56), the driving assembly (6) is used to drive the rotating assembly (55) to slide on the inner side surface of the arc-shaped guide rail (51), and the adjusting assembly (56) is used to change the wheelbase of the wheelchair when climbing a slope; the rotating assembly (55) comprises a tile-shaped plate (551), the surface of the tile-shaped plate (551) is fixedly connected to an arc-shaped slider (552), the surface of the arc-shaped slider (552) is rotatably connected to a cylinder (553), and the surface of the tile-shaped plate (551) is fixedly connected to a cross-section worm gear (554); the driving assembly (6) comprises a support rod (61), the The end face of the support rod (61) is fixedly mounted at a lower position of the inner side surface of the frame (1); the middle position of the surface of the support rod (61) is fixedly connected to the support frame (62); the upper position of the surface of the support frame (62) is fixedly connected to the second motor (63); the output end of the second motor (63) is fixedly connected to the worm (64); the adjustment component (56) includes a fixed rod (561); the surface of the fixed rod (561) is fixedly mounted on the bottom end of the special-shaped rod (53); the end face position of the fixed rod (561) is fixedly connected to the screw slide (563); the position between the screw slide (563) and the special-shaped rod (53) is fixedly connected to a stabilizing body (562); the adjustment component (56) also includes a first motor (564); the surface of the first motor (564) is fixedly mounted on the output end of the screw slide (563); the output end of the first motor (564) is fixedly connected to the rear wheel (565).

2. The variable-distance, high-stability wheelchair for the elderly suitable for use on slopes according to claim 1, characterized in that: There are two special-shaped rods (53), and the inner side surfaces of the two special-shaped rods (53) are fixedly connected to a rotating shaft (52). The position of the surface of the rotating shaft (52) close to the end surface is rotatably connected to the upper position of the inner side surface of the frame (1), and the upper position of the surface of the special-shaped rod (53) is fixedly connected to a rubber tube (54).

3. The variable-distance, high-stability wheelchair for the elderly suitable for use on slopes according to claim 1, characterized in that: There are two arc-shaped sliders (552), and the two arc-shaped sliders (552) are symmetrically distributed with the tile-shaped plate (551) as the center. The surface of the cylinder (553) is rollingly connected to the inner side surface of the arc-shaped guide rail (51), and there are multiple cross-section worm wheels (554).

4. The variable-distance, high-stability wheelchair for the elderly suitable for use on slopes according to claim 1, characterized in that: The forward tilting mechanism (7) comprises a fixed plate (71), the surface of the fixed plate (71) being fixedly mounted above the inner side of the frame (1), the top of the fixed plate (71) being fixedly connected to a buffer assembly (72), and the top of the buffer assembly (72) being fixedly connected to a seat plate (73).

5. The variable-distance, high-stability wheelchair for the elderly suitable for use on slopes according to claim 4, characterized in that: The forward tilting mechanism (7) further comprises a foot frame (74), the top of the foot frame (74) being fixedly mounted on the surface of the seat plate (73), a side of the seat plate (73) away from the foot frame (74) being fixedly connected to a backrest plate (75), and a surface of the backrest plate (75) being fixedly connected to a pushing assembly (76).

6. The variable-distance, high-stability wheelchair for the elderly suitable for use on slopes according to claim 5, characterized in that: The pushing assembly (76) comprises a bending plate (761), the surface of the bending plate (761) being fixedly mounted on the surface of the backrest plate (75), the surface of the bending plate (761) being fixedly connected to an electric cylinder (762), the output end of the electric cylinder (762) being fixedly connected to a forward tilting plate (764), and a plastic plate (763) being fixedly connected to a position between the bottom of the forward tilting plate (764) and the backrest plate (75).

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