WO2024020742A1 - 折叠轮椅 - Google Patents

折叠轮椅 Download PDF

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Publication number
WO2024020742A1
WO2024020742A1 PCT/CN2022/107693 CN2022107693W WO2024020742A1 WO 2024020742 A1 WO2024020742 A1 WO 2024020742A1 CN 2022107693 W CN2022107693 W CN 2022107693W WO 2024020742 A1 WO2024020742 A1 WO 2024020742A1
Authority
WO
WIPO (PCT)
Prior art keywords
bracket
seat
support frame
backrest
folding wheelchair
Prior art date
Application number
PCT/CN2022/107693
Other languages
English (en)
French (fr)
Inventor
李建国
刘杰
王晓栋
汤恒杰
刘灿锋
张哲夫
刘伯锋
姜士伟
Original Assignee
上海邦邦机器人有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海邦邦机器人有限公司 filed Critical 上海邦邦机器人有限公司
Priority to PCT/CN2022/107693 priority Critical patent/WO2024020742A1/zh
Priority to CN202280002585.3A priority patent/CN115413235A/zh
Priority to CN202310376646.9A priority patent/CN116549228A/zh
Publication of WO2024020742A1 publication Critical patent/WO2024020742A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/08—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
    • A61G5/0808—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable characterised by a particular folding direction
    • A61G5/085—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable characterised by a particular folding direction folding up and down, e.g. reducing or expanding the overall height of the wheelchair
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/08—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable
    • A61G5/0883—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs foldable having locking means for maintaining a folded or unfolded condition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1051—Arrangements for steering
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/122—Rests specially adapted therefor, e.g. for the head or the feet for the back
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/128—Rests specially adapted therefor, e.g. for the head or the feet for feet

Definitions

  • the present application relates to the technical field of medical devices, and more specifically, to a folding wheelchair.
  • Folding wheelchairs are a means of transportation for special groups such as the disabled, the elderly and frail, and medical and clinical rehabilitation patients. Because they can be folded, are easy to carry, and take up less space, they are widely used.
  • Existing folding wheelchairs include a front support frame, a backrest bracket, a rear support frame, a bracket connecting rod, a seat bracket and a seat connecting rod.
  • the front support frame, the backrest bracket, the rear support frame and the bracket connecting rod are hinged together to form a foldable wheelchair.
  • the first link mechanism can be folded and deformed to realize the folding of the front support frame, the back support frame and the rear support frame.
  • the above-mentioned front support frame, seat link, seat bracket and backrest bracket form a second linkage mechanism that can be folded and deformed.
  • the first linkage mechanism moves, the second linkage mechanism can follow, thereby realizing the folding of the foldable wheelchair.
  • the seat bracket can be folded during the unfolding process.
  • the folding space between the backrest bracket and the seat bracket of the above-mentioned folding wheelchair is small, and the backrest cushion and/or seat cushion need to be removed when folding.
  • the folding process is cumbersome, resulting in poor user experience.
  • the purpose of this application is to provide a folding wheelchair that can solve the problem that the folding wheelchair is easy to tip over after folding and improve the user experience.
  • the embodiment of the present application provides a folding wheelchair including a front support frame, a back support frame, a rear support frame, a support link, a seat support and a seat link; the front support frame, the back support frame, the rear support frame and the
  • the bracket connecting rods are hinged to each other and form a first linkage mechanism; the seat connecting rods are hinged to the front support frame and the seat bracket respectively, and the front support frame, the backrest bracket, and the seat bracket are hinged to each other.
  • the chair bracket and the seat link form a second link mechanism; the hinge point of the backrest bracket and the seat bracket is located above the center surface of the seat bracket.
  • the backrest bracket has a first installation part for installing the back cushion, and the first installation part is inclined toward the rear side along the first direction.
  • the vertical distance of the rotation axis point g relative to the center plane of the seat frame is X
  • the vertical distance Y of the rotation axis point g relative to the center plane of the first mounting part , and X and Y satisfy 60mm ⁇ X+Y ⁇ 110mm.
  • the seat bracket is tilted relative to the support surface supporting the wheel set of the folding wheelchair, and one end of the seat bracket away from the rotation axis point g is tilted upward; the seat The chair bracket is configured such that when the first mounting portion rotates counterclockwise to fold the folding wheelchair, the seat bracket can rotate counterclockwise; and when the folding wheelchair is in a folded state, the seat bracket The central plane is parallel to the support plane.
  • the backward inclination angle of the first mounting part ranges from 5° to 20°; the inclination angle of the seat bracket ranges from 2° to 8°.
  • the folding wheelchair includes a front wheel, a rear wheel and a support wheel; the front wheel is installed on the front support frame, the rear wheel is installed on the rear support frame; the bracket
  • the connecting rod includes a main body section and an extension section, wherein the main body section is arranged between the rear support frame and the front support frame, and the extension section is arranged outside the rear support frame; the extension section is inclined toward The supporting wheel is arranged at an end of the extended section away from the main body section, and the angle between the folding wheelchair and the main body section is an obtuse angle. , the support wheel and the rear wheel are both in contact with the support surface.
  • the folding wheelchair further includes a hook mechanism; the hook mechanism includes a linkage rod and at least one lock hook, and the lock hook is provided at an end of the linkage rod; the lock The hook is rotatably connected to the backrest bracket, and a torsion spring is provided between the two.
  • the torsion spring is used to provide locking force to the lock hook; the rear support frame is provided with a torsion spring that cooperates with the lock hook.
  • Fixed pin, the lock hook is provided with a limiting groove that cooperates with the fixed pin, and the lock hook engages with the fixed pin through the limiting groove.
  • the locking hook mechanism includes two locking hooks, which are symmetrically arranged at both ends of the linkage rod; the locking hook is provided with a wrench, and the backrest bracket is provided with a wrench. and a positioning protrusion. When the wrench is configured to abut against the positioning protrusion, the limiting groove of the lock hook engages with the fixing pin.
  • the folding wheelchair provided by the embodiment of the present application has the following advantages;
  • the hinge point of the backrest bracket and the seat bracket is located above the center surface of the seat bracket, so that the folding space between the backrest bracket and the seat bracket is larger. Therefore, when the folding wheelchair is folded, There is no interference between the backrest bracket and the seat bracket, and there is no need to remove the backrest cushion installed on the backrest bracket and/or the seat cushion installed on the seat bracket in advance.
  • the backrest bracket and the seat bracket in the folding wheelchair form a hinge point.
  • This hinge point is located below the center plane of the seat bracket.
  • Figure 1 is a schematic diagram of the overall structure of a folding wheelchair provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of the unfolded state of the folding wheelchair provided by the embodiment of the present application.
  • Figure 3 is a schematic diagram of the folding state of the folding wheelchair provided by the embodiment of the present application.
  • Figure 4 is an exploded schematic diagram of the folding wheelchair provided by the embodiment of the present application.
  • Figure 5 is a schematic structural diagram of the folding wheelchair provided by the embodiment of the present application in an unfolded state
  • Figure 6 is a schematic diagram of the position of the rotation axis point g provided by the embodiment of the present application.
  • Figure 7 is a schematic structural diagram of the folding wheelchair provided by the embodiment of the present application in a folded state
  • Figure 8 is a schematic layout diagram of the hook mechanism and locking structure provided by the embodiment of the present application.
  • Figure 9 is a schematic diagram of the connection between the linkage rod and the lock hook in the hook mechanism provided by the embodiment of the present application.
  • Figure 10 is an enlarged schematic diagram of the angle A in Figure 9;
  • Figure 11 is an enlarged schematic diagram of position A in Figure 9 from another angle.
  • the folding wheelchair includes a front support frame, a back support frame, a rear support frame and a support link hinged together to form a foldable and deformable first link mechanism, as well as a front support frame, a seat link, a seat frame and a
  • the backrest bracket forms a second linkage mechanism that can be folded and deformed.
  • the hinge point formed by the above-mentioned seat bracket and the backrest bracket is located below the seat bracket, and the folding space between the backrest bracket and the seat bracket is small. If the backrest cushion installed on the backrest bracket and ⁇ or is not installed on the seat If the seat cushion on the chair frame is removed in advance, the backrest frame and seat frame will interfere with each other during folding, and the folding wheelchair cannot be folded. Therefore, the backrest cushion and/or seat cushion must be removed before folding the folding wheelchair. Come down.
  • embodiments of the present application provide a folding wheelchair.
  • the folding space between the backrest bracket and the seat bracket is smaller. Large, so when the wheelchair is folded, there will be no interference between the backrest bracket and the seat bracket, and there is no need to remove the backrest cushion installed on the backrest bracket and/or the seat cushion installed on the seat bracket in advance; This simplifies the folding process, thereby improving the user experience.
  • the lines shown in the schematic diagrams of the mechanisms involved in the embodiments of the present application are the projection of the center plane of each specific structure in the front direction.
  • the first direction involved in this article is in Figure 5 In the arrow directions shown, the first direction represents the front and rear directions of the folding wheelchair.
  • the folding wheelchair provided by the embodiment of the present application includes a front support frame 10, a backrest bracket 20, an armrest 70, a front wheel 11, a rear wheel 31, a rear support frame 30, a bracket link 40, and a seat.
  • the bracket 60, the seat link 50 and the footrest 80; among them, the front support frame 10, the backrest bracket 20, the rear support frame 30 and the bracket link 40 are hinged together and form a foldable and deformable first link mechanism.
  • the front support frame 10, the backrest frame 20, the seat frame 60, and the seat link 50 are hinged together to form a foldable and deformable second linkage mechanism, and the second linkage mechanism is linked with the first linkage mechanism to During the unfolding or folding process of the folding wheelchair, the seat bracket 60 folds or unfolds accordingly.
  • the armrests 70 on both sides of the backrest bracket 20 can rotate relative to the backrest bracket 20 .
  • the armrest 70 can be rotatably connected to the backrest bracket 20 , or the armrest 70 can be rotatably connected to the front support frame 10 , and the front support frame 10 can be rotatably connected to the backrest bracket 20 .
  • the armrest 70 can be lifted upward to facilitate the user's riding; and when the user rides on the folding wheelchair, the armrest 70 can provide support for the user to enhance the user experience.
  • a folding wheelchair is usually provided with a wheel set.
  • the wheel set is used to support the folding wheelchair and drive the folding wheelchair to move.
  • the wheel set includes a front wheel 11 and a rear wheel 31, and when the folding wheelchair is in a folded state, the front wheel 11 and the rear wheel 31 can be in contact with the ground and form a horizontal support surface to support the entire folding wheelchair.
  • the front support frame 10 is used to install the front wheel 11 and is also called a front wheel support.
  • the footrest 80 is also installed at the front end of the front support frame 10 to provide foot support for the user.
  • the rear support bracket 30 is used to install the rear wheel 31 and is also called a rear wheel bracket.
  • the backrest bracket 20 includes a first installation part 22 and a second installation part 23, and the first installation part 22 is used to install the back cushion of the folding wheelchair, and the second installation part 23 is used to connect with the front support frame 10,
  • the seat bracket 60 and the rear support frame 30 are connected, and the end of the front support frame 10 away from the front wheel 11 and the end of the rear support frame 30 away from the rear wheel 31 are respectively rotatably connected to the second mounting part 23 of the backrest bracket 20, and can Rotate relative to the backrest bracket 20.
  • a bracket link 40 is provided between the rear support frame 30 and the front support frame 10.
  • the two ends of the bracket link 40 are respectively hinged with the rear support frame 30 and the front support frame 10, that is, the front support frame 10, the backrest bracket 20, and the rear support.
  • the frame 30 and the bracket link 40 are rotationally connected to each other and form pivot points a, b, c, d to form a foldable and deformable first link mechanism to realize the front support frame 10, rear support frame 30, 30 of the folding wheelchair.
  • Folding of the backrest bracket 20 When the foldable wheelchair is in the unfolded state, the backrest bracket 20 and the rear support frame 30 are limited and supported by each other, thereby forming a stable triangular structure with pivot points a, c, and d.
  • the above-mentioned seat link 50 is used to connect the seat bracket 60 and the front support frame 10, wherein one end of the seat link 50 is hinged with the seat bracket 60, and the other end of the seat link 50 is hinged with the front support frame 10, that is,
  • the front support frame 10, the seat link 50, the seat bracket 60 and the backrest bracket 20 are hinged to each other and form pivot points e, f, g, a to form a foldable and deformable second link mechanism to achieve folding During the folding and unfolding process of the wheelchair, the seat bracket 60 folds accordingly.
  • the rotation axis point g formed by the backrest bracket 20 and the seat bracket 60 is located above the center plane of the seat bracket 60 .
  • This arrangement makes the folding space between the backrest bracket 20 and the seat bracket 60 larger. Therefore, when the wheelchair is folded, there will be no interference between the backrest bracket 20 and the seat bracket 60, and there is no need to install it on the backrest in advance.
  • the back cushion on the bracket 20 and/or the seat cushion installed on the seat bracket 60 are removed.
  • the backrest bracket and the seat bracket in the folding wheelchair form a hinge point.
  • This hinge point is located below the center plane of the seat bracket.
  • the front support frame 10, the backrest bracket 20, the rear support frame 30 and the bracket connecting rod 40 are hinged in sequence to form a pivot point. a, b, c, d.
  • one end of the front support frame 10 away from the front wheel 11 is hinged with the second mounting portion 23 of the backrest bracket 20 to form the pivot point a
  • the second mounting portion 23 of the backrest bracket 20 is connected to the rear support.
  • One end of the frame 30 away from the rear wheel 31 is hinged and forms a pivot point b; the two ends of the bracket link 40 are respectively hinged with the rear support frame 30 and the front support frame 10 to form pivot points c and d, and each pivot point a
  • the front support frame 10, the seat link 50, the seat bracket 60, and the backrest bracket 20 are spliced in sequence to form pivot points e, f, g, a, and the pivot point g is located on the seat bracket 60 above the center plane.
  • the seat link 50 is used to connect the front support frame 10 and the seat bracket 60.
  • One end of the seat link 50 is hinged with the front support frame 10 and forms the pivot point e.
  • the seat The other end of the connecting rod 50 is hinged with the seat frame 60 and forms the pivot point f.
  • One end of the seat bracket 60 away from the pivot point f is hinged with the second mounting portion 23 of the backrest bracket 20 to form a pivot point g, and the pivot point g is located above the center plane of the seat bracket 60; and the second mounting portion of the backrest bracket 20 23 is also hinged with the front support frame 10 and forms the pivot point a.
  • each pivot point in the first linkage mechanism and the second linkage mechanism satisfies the above positional relationship.
  • the middle seat bracket 60 folds accordingly, and when the folding wheelchair is in the folded state, the backrest bracket 20 can rotate to a horizontal state and remain parallel to the support surface supporting the folding wheelchair. Therefore, after folding, the folding wheelchair is in a horizontal state as a whole and is relatively flat. It is flat, so the center of gravity of the folded wheelchair is stable and difficult to tip over, thus improving the user experience.
  • the vertical distance of the rotation axis point g relative to the center plane of the seat frame 60 is X
  • the vertical distance Y of the rotation axis point g relative to the center plane of the first mounting part 22 then X and Y satisfy 60 ⁇ x+ y ⁇ 110mm.
  • the value range of X is 10mm ⁇ X ⁇ 50mm
  • the value range of Y is 50mm ⁇ Y ⁇ 60mm.
  • the entire seat bracket 60 is tilted relative to the support surface, wherein the first end of the seat bracket 60 is a free end, and the second end of the seat bracket 60 is hingedly connected to the second mounting portion 23 of the backrest bracket 20 .
  • a rotation axis point g is formed, and the rotation axis point g is located above the center plane of the seat frame 60 .
  • the rear inclination angle of the first mounting portion 22 of the backrest bracket 20 is ⁇ , and the value range of ⁇ is from 5° to 20°.
  • the second end of the seat bracket 60 is arranged obliquely upward relative to the horizontal support surface, and the angle of elevation formed is ⁇ , and the value of ⁇ ranges from 2° to 8°.
  • the backrest bracket 20 When folding the folding wheelchair, the backrest bracket 20 is rotated counterclockwise, and the seat bracket 60 can follow the clockwise rotation.
  • the seat bracket 60 When the backrest bracket 20 rotates counterclockwise 90°+ ⁇ °, the seat bracket 60 can rotate counterclockwise through an angle ⁇ , and the center surface of the seat bracket 60 is parallel to the horizontal support surface, that is, the center surface of the seat bracket 60 can be parallel to the horizontal support surface.
  • the center planes of the backrest bracket 20 are parallel, and both are in a horizontal state.
  • the rear inclination angle of the first mounting portion 22 of the backrest bracket 20 is 16°
  • the elevation angle of the seat bracket 60 relative to the supporting surface is 4°.
  • the backrest bracket 20 rotates counterclockwise 16°
  • the seat The chair bracket 60 can be rotated counterclockwise by 4°
  • the center surface of the seat bracket 60 can be parallel to the center surface of the backrest bracket 20, and both are parallel to the horizontal support surface.
  • the wheel set of the folding wheelchair in the embodiment of the present application not only includes the front wheel 11 and the rear wheel 31, but also includes a connecting rod 40 installed on the bracket.
  • the support wheel 41 on.
  • the bracket link 40 is arranged between the front support frame 10 and the rear support frame 30 , and the bracket link 40 includes a main body section 42 and an extension section 43 , the main body section 42 is located between the front support frame 10 and the rear support frame 30 , the main body section 42 is hinged with the front support frame 10 and forms a rotation axis point d, and the main body section 42 is hinged with the rear support frame 30 and forms a rotation axis point c.
  • the extension section 43 and the main body section 42 are of an integral structure, and the angle formed between the extension section 43 and the main body section 42 is an obtuse angle.
  • the extension section 43 is arranged outside the rear support frame 30 and extends diagonally downward along the rear support frame 30. One end of the extension section 43 extends to the pivot point c, and the other end of the extension section 43 is used to install the support wheel 41, and the support wheel 41 can rotate relative to the bracket link 40 .
  • the angle between the main body section 42 and the extension section 43 is an obtuse angle (>90°).
  • the support wheel 41 is close to the rear of the vehicle body (constraining the distance between the end point of the extension section 43 and the boundary of the rear end of the vehicle body), which is convenient for wheelchairs.
  • the folded wheelchair can be towed (the towing handle is located at the front wheel bracket or foot pedal position), and the foldable wheelchair can be placed sideways with the structure near the pivot point b and the support wheel 41 as the supporting surface.
  • the folding wheelchair when the folding wheelchair is in the folded state, its front wheels can also be in contact with the ground, so that the front wheels 11, the rear wheels 31 and the support wheels 41 are all in contact with the ground to form a stable support surface, which can further improve the position of the folding wheelchair. Stability in the folded state.
  • the backrest bracket 20 and the rear support frame 30 have a locking structure.
  • the backrest bracket 20 and the rear support frame 30 are limited and supported by each other through the locking structure, thereby forming a stable triangular structure of the rotation axis points a, c, and d.
  • the locking structure is formed between the backrest bracket 20 and the rear support frame 30.
  • the locking structure includes a first locking surface 21 and a second locking surface 32, wherein the backrest bracket 20 is provided with a position close to the rear support frame 30.
  • the surface is recessed to form the first locking surface 21 , that is, the recessed surface forms the first locking surface 21 .
  • the end of the rear support frame 30 close to the backrest bracket 20 has a protrusion.
  • the protrusion is matched with the recess.
  • the protrusion has a second locking surface 32 that cooperates with the first locking surface 21 .
  • the protrusion can be embedded in the depression, and the first locking surface 21 and the second locking surface 32 are in contact with each other, thereby completing the connection between the backrest bracket 20 and the second locking surface 32 .
  • the limiting support of the rear support frame 30 prevents the backrest bracket 20 and the rear support frame 30 from rotating relative to each other around the rotation axis point b.
  • the folding wheelchair provided by the embodiment of the present application also includes a locking hook mechanism 90.
  • the locking hook mechanism 90 includes a linkage rod 91 and at least one locking hook 92.
  • the linkage rod 91 runs through the seat bracket 60. Below, and the end of the linkage rod 91 is fixed with a lock hook 92, and the lock hook 92 is rotatably connected to the backrest bracket 20.
  • the rear support frame 30 is provided with a fixed pin 33 that cooperates with the lock hook 92.
  • the lock hook 92 has a limiting groove 922 that cooperates with the fixed pin 33. This limiting groove 922 can be engaged with the fixed pin 33.
  • the rear support frame 30 and the lock A torsion spring 93 is also provided between the hooks 92 .
  • the torsion spring 93 is used to provide a locking force to the lock hook 92 so as to keep the lock hook 92 on the backrest bracket 20 .
  • the back side of the locking hook 92 first contacts the fixing pin 33, and under the thrust of the rear support frame 30, the locking hook 92 can overcome the locking force of the torsion spring 93 and rotate clockwise, thereby fixing the pin 33 It can be snapped into the limiting groove 922; at this time, the locking hook 92 rotates counterclockwise and resets under the action of the torsion spring 93, and the bottom of the locking hook 92 contacts the limiting protrusion of the backrest bracket 20, thereby realizing the locking of the backrest bracket 20.
  • the restraint with the rear support frame 30 prevents the backrest bracket 20 and the rear support frame 30 from being separated from each other around the rotation axis point b.
  • the back bracket and the rear support frame 30 are limited and supported by a locking structure to prevent the backrest bracket 20 and the rear support frame 30 from rotating relative to each other around the rotation axis point b, so that the backrest bracket 20 and the rear support frame 30 are completely connected to each other.
  • the first link mechanism group forms a stable trigonal structure with rotation axis points a, c, and d.
  • the hook mechanism 90 provided in the embodiment of the present application includes a first lock hook and a second lock hook, wherein the first lock hook and the second lock hook are symmetrically arranged at both ends of the linkage rod 91, and the first lock hook It is a symmetrical piece with the second lock hook, and its specific structure will be described by taking the first lock hook as an example.
  • the first lock hook includes a wrench 921 , and the wrench 921 is used to exert pressure on the first lock hook so that it overcomes the torsion force of the torsion spring 93 , and the first lock hook rotates relative to the backrest bracket 20 .
  • the wrench 921 is pressed down and the first lock hook rotates clockwise, the first lock hook is disengaged from the fixing pin 33, thereby releasing the limit between the rear support frame 30 and the backrest bracket 20 to fold the foldable wheelchair.
  • the backrest bracket 20 is provided with a positioning protrusion near the first lock hook.
  • the positioning protrusion can contact the bottom of the wrench 921.
  • the torsion spring 93 provides outward support force for the first lock hook so that the first lock hook has Rotate counterclockwise, when the bottom of the wrench 921 contacts the positioning protrusion, the first lock hook rotates in place, and the limit groove 922 of the first lock hook engages with the fixing pin 33 to complete the alignment of the backrest bracket 20 Locking of 31 brackets with rear wheels.
  • first lock hook and second lock hook can rotate synchronously.
  • the wrench 921 of any lock hook 92 the backrest bracket 20 and the rear support bracket 30 can be locked and unlocked. This improves user experience.
  • references such as “one embodiment”, “embodiments”, “exemplary embodiments”, “some embodiments”, etc. in the specification may include specific features, structures or characteristics, but not necessarily every The embodiments include the specific features, structures or characteristics. Furthermore, such phrases are not necessarily referring to the same embodiment. Furthermore, where a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments, explicitly or not explicitly described.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Handcart (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)

Abstract

一种折叠轮椅，涉及医疗器械技术领域，用于解决折叠轮椅靠背支架与座椅支架之间的折叠空间小，折叠时需要拆卸靠背垫和/或座垫，折叠过程较为繁琐，导致用户体验较差的技术问题，该折叠轮椅包括形成第一连杆机构的前支撑架（10）、靠背支架（20）、后支撑架（30）及支架连杆（40）相互铰接并形成第一连杆机构；座椅连杆（50）分别与前支撑架（10）、座椅支架（60）铰接，且前支撑架（10）、靠背支架（20）、座椅支架（60）、座椅连杆（50）形成第二连杆机构；靠背支架（20）与座椅支架（60）的铰接点位于座椅支架（60）中心面的上方。在折叠轮椅进行折叠时，无需对预先对靠背垫和/或者座垫进行拆除，从而简化折叠过程，进而提升用户体验。

Description

折叠轮椅 技术领域
本申请涉及医疗器械技术领域，更为具体地，涉及一种折叠轮椅。
背景技术
折叠轮椅是特殊人群如残疾、年迈体弱以及医疗临床康复患者等的代步工具，由于其能够折叠，可便于携带以及占用空间较小，因而受到广泛应用。
现有的折叠轮椅包括前支撑架、靠背支架、后支撑架、支架连杆、座椅支架及座椅连杆，其中前支撑架、靠背支架、后支撑架以及支架连杆铰接在一起并形成可收折变形的第一连杆机构，以实现前支撑架、靠背支架以及后支撑架的收折。
上述前支撑架、座椅连杆、座椅支架以及靠背支架形成可收折变形的第二连杆机构，第一连杆机构动作时，第二连接机构可随动，进而可实现折叠轮椅折叠、展开过程中座椅支架可跟随折叠。然而，上述折叠轮椅靠背支架与座椅支架之间的折叠空间小，折叠时需要拆卸靠背垫和/或座垫，折叠过程较为繁琐，导致用户体验较差。
发明内容
本申请的目的在于提供一种折叠轮椅，能够解决折叠轮椅折叠后容易倾倒的问题，提升用户体验。
为了实现上述目的，本申请实施例提供如下技术方案：
本申请实施例提供折叠轮椅包括前支撑架、靠背支架、后支撑架、支架连杆、座椅支架及座椅连杆；所述前支撑架、所述靠背支架、所述后支撑架及所述支架连杆相互铰接并形成第一连杆机构；所述座椅连杆分别与所述前支撑架、所述座椅支架铰接，且所述前支撑架、所述靠背支架、所述座椅支架、所述座椅连杆形成第二连杆机构；所述靠背支架与所述座椅支架的铰接点位于所述座椅支架的中心面的上方。
在一种可能的实现方式中，在所述第一连杆机构中，所述前支撑架、所述靠背支架、所述后支撑架及所述支架连杆依次铰接并形成转轴点a、b、c、d，且各所述转轴点之间的位置关系满足：ab:bc:cd:da＝1：1.1～1.2：2.4～3：2.4～2.8；
在所述第二连杆机构中，所述前支撑架、所述座椅连杆、所述座椅支架、所述靠背支架依次拼接并形成转轴点e、f、g、a，且所述转轴点g位于所述座椅支架的中心面上方；各所述转轴点之间的位置关系满足ef:fg:ga:ae＝1～1.8：2.8～4.8：1：2.2～3.2。
在一种可能的实现方式中，在所述第一连杆机构中，各所述转轴点之间的位置关系满足：ab:bc:cd:da＝1：1.2：2.75：2.7。
在一种可能的实现方式中，在所述第二连杆机构中，各所述转轴点之间的位置关系满足：ef:fg:ga:ae＝1.65：4.7：1：3.1。
在一种可能的实现方式中，所述靠背支架具有用于安装靠背垫的第一安装部，沿第一 方向，所述第一安装部朝向后侧倾斜。
在一种可能的实现方式中，所述转轴点g相对于所述座椅支架的中心面的垂直距离为X，所述转轴点g相对于所述第一安装部的中心面的垂直距离Y，且X、Y满足为60mm≤X+Y≤110mm。
在一种可能的实现方式中，所述座椅支架相对于支撑所述折叠轮椅的轮组的支撑面倾斜设置，且所述座椅支架远离所述转轴点g的一端向上倾斜；所述座椅支架配置为所述第一安装部逆时针转动以对所述折叠轮椅进行折叠时，所述座椅支架能够逆时针转动；以及，所述折叠轮椅处于折叠状态时，所述座椅支架的中心面与所述支撑面平行。
在一种可能的实现方式中，所述第一安装部的后倾角的角度范围为5°～20°；所述座椅支架的倾斜角的角度范围为2°～8°。
在一种可能的实现方式中，所述折叠轮椅包括前轮、后轮及支撑轮；所述前轮安装在所述前支撑架上，所述后轮安装在后支撑架上；所述支架连杆包括主体段和延伸段，其中所述主体段设置于所述后支撑架与所述前支撑架之间，所述延伸段布置在所述后支撑架的外侧；所述延伸段倾斜向下布置，并与所述主体段之间的夹角为钝角；所述支撑轮设置在所述延伸段远离所述主体段的一端，且所述支撑轮配置为所述折叠轮椅呈折叠状态时，所述支撑轮、所述后轮均与所述支撑面抵接。
在一种可能的实现方式中，所述折叠轮椅还包括锁钩机构；所述锁钩机构包括联动杆以及至少一个锁钩，所述锁钩设置在所述联动杆的端部；所述锁钩转动连接在所述靠背支架上，且两者之间设置有扭簧，所述扭簧用于向所述锁钩提供锁紧力；所述后支撑架设置有与所述锁钩配合的固定销，所述锁钩设置有与所述固定销配合的限位槽，所述锁钩通过所述限位槽卡合至所述固定销。
在一种可能的实现方式中，所述锁钩机构包括两个锁钩，两个所述锁钩对称设置在所述联动杆两端；所述锁钩设置有扳手，所述靠背支架设置有定位凸起，所述扳手配置为其与所述定位凸起抵接时，所述锁钩的限位槽卡合至所述固定销。
与相关技术相比，本申请实施例提供的折叠轮椅，具有如下优点；
本申请实施例提供的折叠轮椅，靠背支架与座椅支架的铰接点位于座椅支架中心面的上方，以使靠背支架与座椅支架之间的折叠空间较大，因此折叠轮椅进行折叠时，靠背支架与座椅支架之间不会出现干涉，也无需预先将安装至靠背支架上的靠背垫和/或者安装在座椅支架的上的座垫进行拆除。
与相关技术中，折叠轮椅中的靠背支架与座椅支架的形成铰接点，此铰接点位于座椅支架的中心面的下方，折叠时需要预先将折叠座椅的座垫和/或靠背垫进行拆卸的方案相比，本申请实施例中折叠轮椅进行折叠时，无需对预先对靠背垫和/或者座垫进行拆除，从而简化折叠过程，进而提升用户体验。
除了上面所描述的本申请实施例解决的技术问题、构成技术方案的技术特征以及由这些技术方案的技术特征所带来的有益效果外，本公开实施例提供的折叠轮椅所能解决的其他技术问题、技术方案中包含的其他技术特征以及这些技术特征带来的有益效果，将在具体实施方式中作出进一步详细的说明。
附图说明
图1为本申请实施例提供的折叠轮椅的整体结构示意图；
图2为本申请实施例提供的折叠轮椅展开状态示意图；
图3为本申请实施例提供的折叠轮椅的折叠状态示意图；
图4为本申请实施例提供的折叠轮椅的爆炸示意图；
图5为本申请实施例提供的折叠轮椅处于展开状态下的结构简图；
图6为本申请实施例提供的转轴点g的位置示意图；
图7为本申请实施例提供的折叠轮椅处于折叠状态下的结构简图；
图8为本申请实施例提供的锁钩机构、锁止结构的布置示意图；
图9为本申请实施例提供的锁钩机构中的联动杆与锁钩的连接示意图；
图10为图9中A处一角度放大示意图；
图11为图9中A处另一角度放大示意图。
附图标记说明：
10-前支撑架；
11-前轮；
20-靠背支架；
21-第一锁止面；22-第一安装部；23-第二安装部；
30-后支撑架；
31-后轮；32-第二锁止面；33-固定销；
40-支架连杆；
41-支撑轮；42-主体段；43-延伸段；
50-座椅连杆；
60-座椅支架；
70-扶手；
80-脚踏；
90-锁钩机构；
91-联动杆；92-锁钩；921-扳手；922-限位槽；93-扭簧。
具体实施方式
正如背景技术所述，相关技术中的折叠轮椅折叠时需要拆卸靠背垫和/或座垫，折叠过程较为繁琐，导致用户体验较差的技术问题，经发明人研究发现，出现这种问题的原因在于，折叠轮椅包括由前支撑架、靠背支架、后支撑架以及支架连杆铰接在一起并形成可收折变形的第一连杆机构，以及前支撑架、座椅连杆、座椅支架以及靠背支架形成可收折变形的第二连杆机构，当第一连杆机构动作时，第二连杆机构可随动，进而可实现折叠轮椅折叠、展开过程中座椅支架可跟随折叠。
然而上述座椅支架与靠背支架形成的铰接点位于座椅支架的下方，靠背支架与座椅支架之间的折叠空间较小，若不将安装在靠背支架上的靠背垫和\或安装在座椅支架上的座垫进行预先拆除，则靠背支架与座椅支架在折叠时出现干涉，从而不能使折叠轮椅完成折叠，因此在折叠轮椅进行折叠前，需预先将靠背垫和/或座垫拆卸下来。
针对上述技术问题，本申请实施例提供了一种折叠轮椅，通过将靠背支架与座椅支架 的铰接点位于座椅支架中心面的上方，以使靠背支架与座椅支架之间的折叠空间较大，因此折叠轮椅进行折叠时，靠背支架与座椅支架之间不会出现干涉，也无需预先将安装至靠背支架上的靠背垫和/或者安装在座椅支架的上的座垫进行拆除；如此可简化折叠过程，进而提升用户体验。
为了使本申请实施例的上述目的、特征和优点能够更加明显易懂，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其它实施例，均属于本申请保护的范围。
为便于对本申请实施例理解，本申请实施例中所涉及机构原理图中所示线条均为每个具体结构的中心面在正视方向上的投影，本文中所涉及的第一方向为图5中所示的箭头方向，第一方向代表折叠轮椅的整机的前、后方向。
如图1至图5所示，本申请实施例提供的折叠轮椅包括前支撑架10、靠背支架20、扶手70、前轮11、后轮31、后支撑架30、支架连杆40、座椅支架60、座椅连杆50及脚踏80；其中，前支撑架10、靠背支架20、后支撑架30以及支架连杆40铰接在一起，并形成可收折变形的第一连杆机构。
前支撑架10、靠背支架20、座椅支架60、座椅连杆50铰接在一起并形成可收折变形的第二连杆机构，且第二连杆机构与第一连杆机构联动，以实现折叠轮椅整机展开或者折叠过程中，座椅支架60随动折叠或者展开。
靠背支架20两侧的扶手70，扶手70可相对靠背支架20转动。例如扶手70可以转动连接在靠背支架20上，或者扶手70可转动连接在前支撑架10上，且前支撑架10转动连接在靠背支架20上。使用者在上、下折叠轮椅时，可将扶手70向上抬起，以方便用户乘坐；以及当使用者乘坐折叠轮椅时，扶手70可为使用者提供支撑，以提升使用体验。
具体地，折叠轮椅通常设置有轮组，轮组用于支撑折叠轮椅并带动折叠轮椅移动，轮组包括前轮11和后轮31，并且当折叠轮椅处于折叠状态时，前轮11和后轮31能够与地面接触，并形成水平的支撑面，以支撑整个折叠轮椅。前支撑架10用于安装前轮11，也被称为前轮支架，脚踏80也安装在前支撑架10的前端，以为使用者提供脚部支撑。后支撑架30用于安装后轮31，也被称为后轮支架。
如图6所示，靠背支架20包括第一安装部22和第二安装部23，且第一安装部22用于安装折叠轮椅的靠背垫，第二安装部23用于与前支撑架10、座椅支架60、后支撑架30连接，且前支撑架10远离前轮11的一端、后支撑架30远离后轮31的一端分别转动连接在靠背支架20的第二安装部23上，并能够相对靠背支架20转动。
后支撑架30与前支撑架10之间设置有支架连杆40，支架连杆40的两端分别与后支撑架30和前支撑架10铰接，即前支撑架10、靠背支架20、后支撑架30、支架连杆40相互转动连接并形成转轴点a、b、c、d，以形成可收折变形的第一连杆机构，以实现折叠轮椅的前支撑架10、后支撑架30、靠背支架20的收折。当折叠轮椅处于展开状态时，靠背支架20、后支撑架30之间彼此限位支撑，进而形成转轴点a、c、d的稳定三角形结构。
上述座椅连杆50用于连接座椅支架60与前支撑架10，其中座椅连杆50的一端与座椅支架60铰接，座椅连杆50的另一端与前支撑架10铰接，即前支撑架10、座椅连杆50、 座椅支架60、靠背支架20相互铰接并形成转轴点为e、f、g、a，以形成可收折变形的第二连杆机构，以实现折叠轮椅整机折叠、展开过程中座椅支架60随动折叠。
进一步地，本申请实施例中靠背支架20与座椅支架60形成的转轴点g，且转轴点g位于座椅支架60的中心面的上方。如此设置，以使靠背支架20与座椅支架60之间的折叠空间较大，因此折叠轮椅进行折叠时，靠背支架20与座椅支架60之间不会出现干涉，也无需预先将安装至靠背支架20上的靠背垫和/或者安装在座椅支架60的上的座垫进行拆除。
与现有技术中，折叠轮椅中的靠背支架与座椅支架的形成铰接点，此铰接点位于座椅支架的中心面的下方，折叠时需要预先将折叠座椅的座垫和/或靠背垫进行拆卸的方案相比，本申请实施例中折叠轮椅进行折叠时，无需对预先对靠背垫和/或者座垫进行拆除，从而简化折叠过程，进而提升用户体验。
如图5至图7所示，在上述实施例的基础上，在上述第一连杆机构中，前支撑架10、靠背支架20、后支撑架30及支架连杆40依次铰接并形成转轴点a、b、c、d。
具体地，在第一连杆机构中，前支撑架10远离前轮11的一端与靠背支架20的第二安装部23铰接并形成转轴点a，靠背支架20的第二安装部23与后支撑架30远离后轮31的一端铰接，并形成转轴点b；支架连杆40的两端分别与后支撑架30、前支撑架10分别铰接并形成转轴点c、d，并且各转轴点a、b、c、d之间的位置关系满足ab:bc:cd:da＝1：1.1～1.2：2.4～3：2.4～2.8。优选地，各转轴点a、b、c、d之间的位置关系满足ab:bc:cd:da＝1：1.2：2.75：2.7。
在第二连杆机构中，前支撑架10、座椅连杆50、座椅支架60、靠背支架20依次拼接并形成转轴点e、f、g、a，且转轴点g位于座椅支架60的中心面上方。
具体地，在第二连杆机构中，座椅连杆50用于连接前支撑架10与座椅支架60，座椅连杆50的一端与前支撑架10铰接并形成转轴点e，座椅连杆50的另一端与座椅支架60铰接并形成转轴点f。座椅支架60远离转轴点f的一端与靠背支架20的第二安装部23铰接并形成转轴点g，且转轴点g位于座椅支架60的中心面上方；并且靠背支架20的第二安装部23还与前支撑架10铰接并形成转轴点a。进一步地，上述各转轴点e、f、g、a的位置关系满足ef:fg:ga:ae＝1～1.8：2.8～4.8：1：2.2～3.2。优选地，上述各转轴点e、f、g、a的位置关系满足ef:fg:ga:ae＝1.65：4.7：1：3.1。
如此设置，本申请实施例中上述第一连杆机构和第二连杆机构中各转轴点满足上述位置关系，不仅能够在第一连杆机构动作时，可实现折叠轮椅整机折叠、展开过程中座椅支架60随动折叠，而且在折叠轮椅处于折叠状态时，靠背支架20能够转动至水平状态，并与支撑该折叠轮椅的支撑面保持平行，因此折叠后折叠轮椅整体呈水平状态且较为平整，因此折叠后的折叠轮椅重心稳定，不易倾倒，从而提升用户体验。
继续参阅图6，转轴点g相对于座椅支架60的中心面的垂直距离为X，转轴点g相对于第一安装部22的中心面的垂直距离Y，则X、Y满足60≤x+y≤110mm。例如，其中X的取值范围为10mm≤X≤50mm，其中Y的取值范围为50mm≤Y≤60mm。如此设置，本申请实施例中折叠轮椅呈折叠状态下，靠背支架20与座椅支架60能够容纳座垫、靠背垫，避免在折叠过程中，靠背支架20与座椅支架60出现干涉，在对折叠轮椅进行折叠时，无需对折叠轮椅进行折叠前拆除座垫，提升用户体验。
在一些实施例中，座椅支架60整体相对支撑面倾斜设置，其中座椅支架60的第一端为自由端，座椅支架60的第二端与靠背支架20的第二安装部23铰接并形成转轴点g，且转轴点g位于座椅支架60的中心面的上方。其中，靠背支架20的第一安装部22的后倾角的角度为α，且α的取值范围为5°至20°。座椅支架60的第二端相对水平的支撑面斜向上设置，且形成的仰角的角度为β，且β的取值范围为2°至8°。
在对折叠轮椅进行折叠时，逆时针转动靠背支架20，则座椅支架60能够跟随顺时针转动。当靠背支架20逆时针转动90°+α°后，座椅支架60可逆时针转动β角度后，且座椅支架60的中心面与水平的支撑面平行，即座椅支架60的中心面能够与靠背支架20的中心面平行，两者均处于水平状态。
例如，本实施例中靠背支架20的第一安装部22的后倾角的角度为16°，座椅支架60相对支撑面的仰角为4°，则当靠背支架20逆时针转动16°后，座椅支架60可逆时针转动4°后，且座椅支架60的中心面能够与靠背支架20的中心面平行，两者分别与水平的支撑面平行。如此设置，可使靠背支架20与座椅支架60贴合，进一步提升折叠轮椅处于折叠状态下，其整体更加平整，重心更稳定，不易倾倒，从而提升用户体验。
如图6所示，并结合图4，在上述实施例的基础上，本申请实施例中的折叠轮椅的轮组不仅包括前轮11和后轮31，轮组还包括安装在支架连杆40上的支撑轮41。
具体地，支架连杆40布置在前支撑架10与后支撑架30之间，并且支架连杆40包括主体段42和延伸段43，主体段42位于前支撑架10与后支撑架30之间，主体段42与前支撑架10铰接并形成转轴点d，主体段42与后支撑架30铰接并形成转轴点c。
延伸段43与主体段42为一体结构，且延伸段43与主体段42之间形成的夹角为钝角。延伸段43布置在后支撑架30的外侧，并沿后支撑架30斜向下延伸，延伸段43的一端延伸至转轴点c，延伸段43的另一端用于安装支撑轮41，且支撑轮41能够相对支架连杆40转动。如此设置，折叠轮椅处于折叠状态时，支撑轮41能够与地面接触，进而后轮31、支撑轮41与地面形成稳定支撑面，从而提升折叠轮椅处于折叠状态下的稳定性，防止其倾倒。
再者，主体段42与延伸段43之间的夹角呈钝角(＞90°)，折叠状态下支撑轮41靠近车体尾部(约束延伸段43末端点与车体尾部边界距离)，便于轮椅折叠状态拖行(拖行把手位于前轮支架或脚踏板位置)，同时可以以转轴点b附近结构、支撑轮41为支撑面将折叠轮椅侧立放置。需要理解的是，在折叠轮椅处于折叠状态下，其前轮也能够与地面接触，从而前轮11、后轮31及支撑轮41均与地面接触形成稳定的支撑面，可进一步提升折叠轮椅处于折叠状态下的稳定性。
如图8至图11所示，并参阅图5，在上述实施例的基础上，本申请实施例提供的折叠轮椅中，靠背支架20和后支撑架30具有锁止结构，当折叠轮椅处于展开状态时，靠背支架20、后支撑架30之间通过锁止结构彼此限位支撑，进而形成转轴点a、c、d的稳定三角形结构。
具体地，锁止结构形成在靠背支架20与后支撑架30之间，锁止结构包括第一锁止面21、第二锁止面32，其中靠背支架20靠近后支撑架30的位置设置有凹陷以形成第一锁止面21，即形成凹陷的表面形成第一锁止面21。后支撑架30靠近靠背支架20的端部具有凸起，凸起与凹陷配合设置，凸起具有与第一锁止面21配合的第二锁止面32。在折叠轮 椅的展开过程中，当靠背支架20旋转到位时，凸起可嵌设至凹陷内，且第一锁止面21和第二锁止面32抵接贴合，进而完成靠背支架20与后支撑架30的限位支撑，防止靠背支架20与后支撑架30绕转轴点b相向转动。
为提升折叠轮椅展开状态的稳定性，本申请实施例提供的折叠轮椅还包括锁钩机构90，锁钩机构90包括联动杆91和至少一个锁钩92，联动杆91贯穿设置座椅支架60的下方，并且联动杆91的端部固定有锁钩92，锁钩92转动连接在靠背支架20上。
后支撑架30设置有与锁钩92配合的固定销33，锁钩92具有与固定销33配合的限位槽922，此限位槽922可与固定销33卡接，后支撑架30与锁钩92之间还设置有扭簧93，扭簧93用于向锁钩92提供锁紧力，以使锁钩92保持在靠背支架20上。
当折叠轮椅展开到位后，锁钩92的背面先与固定销33接触，并且在后支撑架30的推力作用下，锁钩92能够克服扭簧93的锁紧力顺时针转动，从而固定销33可卡入限位槽922内；此时，锁钩92在扭簧93作用下逆时针转动并复位，锁钩92的底部与靠背支架20的限位凸起抵接，从而实现对靠背支架20与后支撑架30的约束，防止靠背支架20与后支撑架30绕转轴点b相互分离。于此同时，背支架与后支撑架30之间通过锁止结构进行限位支撑，防止靠背支架20与后支撑架30绕转轴点b相向转动，进而靠背支架20、后支撑架30彼此间完全约束，第一连杆机构组形成了转轴点a、c、d的稳定三边形结构。
示例性地，本申请实施例提供的锁钩机构90包括第一锁钩和第二锁钩，其中第一锁钩和第二锁钩对称设置在联动杆91的两端，且第一锁钩与第二锁钩为对称件，以第一锁钩为例对其具体结构进行说明。
第一锁钩包括扳手921，扳手921用于对第一锁钩施加压力，以使其克服扭簧93的扭力，第一锁钩相对靠背支架20旋转。例如，下压扳手921，第一锁钩顺时针转动，则第一锁钩与固定销33脱离，从而解除后支撑架30与靠背支架20之间的限位，以对折叠轮椅进行折叠。
靠背支架20靠近第一锁钩的位置设置有定位凸起，定位凸起可与扳手921的底部抵接，扭簧93为第一锁钩提供向外的支撑力，以使第一锁钩具有朝向逆时针转动，当扳手921的底部与定位凸起抵接时，此时第一锁钩旋转到位，且第一锁钩的限位槽922与固定销33卡接，以完成对靠背支架20与后轮31支架的锁定。
需要说明的是，上述第一锁钩、第二锁钩可同步转动，当使用者操作任一个锁钩92的扳手921时，即能够完成对靠背支架20与后支撑架30的锁定及解锁，如此可提升用户体验。
本说明书中各实施例或实施方式采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分相互参见即可。
应当指出，在说明书中提到的“一个实施例”、“实施例”、“示例性实施例”、“一些实施例”等表示的实施例可以包括特定特征、结构或特性，但未必每个实施例都包括该特定特征、结构或特性。此外，这样的短语未必是指同一实施例。此外，在结合实施例描述特定特征、结构或特性时，结合明确或未明确描述的其他实施例实现这样的特征、结构或特性处于本领域技术人员的知识范围之内。
一般而言，应当至少部分地由语境下的使用来理解术语。例如，至少部分地根据语境，文中使用的术语“一个或多个”可以用于描述单数的意义的任何特征、结构或特性，或者可 以用于描述复数的意义的特征、结构或特性的组合。类似地，至少部分地根据语境，还可以将诸如“一”或“”的术语理解为传达单数用法或者传达复数用法。
应当容易地理解，应当按照最宽的方式解释本公开中的“在……上”、“在……以上”和“在……之上”，以使得“在……上”不仅意味着“直接处于某物上”，还包括“在某物上”且其间具有中间特征或层的含义，并且“在……以上”或者“在……之上”不仅包括“在某物以上”或“之上”的含义，还可以包括“在某物以上”或“之上”且其间没有中间特征或层(即，直接处于某物上)的含义。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (11)

  1. 一种折叠轮椅，其特征在于，包括前支撑架、靠背支架、后支撑架、支架连杆、座椅支架及座椅连杆；
    所述前支撑架、所述靠背支架、所述后支撑架及所述支架连杆相互铰接并形成第一连杆机构；所述座椅连杆分别与所述前支撑架、所述座椅支架铰接，且所述前支撑架、所述靠背支架、所述座椅支架、所述座椅连杆形成第二连杆机构；
    所述靠背支架与所述座椅支架的铰接点位于所述座椅支架的中心面的上方。
  2. 根据权利要求1所述的折叠轮椅，其特征在于，在所述第一连杆机构中，所述前支撑架、所述靠背支架、所述后支撑架及所述支架连杆依次铰接并形成转轴点a、b、c、d，且各所述转轴点之间的位置关系满足：ab:bc:cd:da＝1：1.1～1.2：2.4～3：2.4～2.8；
    在所述第二连杆机构中，所述前支撑架、所述座椅连杆、所述座椅支架、所述靠背支架依次拼接并形成转轴点e、f、g、a，且所述转轴点g位于所述座椅支架的中心面上方；
    各所述转轴点之间的位置关系满足ef:fg:ga:ae＝1～1.8：2.8～4.8：1：2.2～3.2。
  3. 根据权利要求2所述的折叠轮椅，其特征在于，在所述第一连杆机构中，各所述转轴点之间的位置关系满足：ab:bc:cd:da＝1：1.2：2.75：2.7。
  4. 根据权利要求2所述的折叠轮椅，其特征在于，在所述第二连杆机构中，各所述转轴点之间的位置关系满足：ef:fg:ga:ae＝1.65：4.7：1：3.1。
  5. 根据权利要求2所述的折叠轮椅，其特征在于，所述靠背支架具有用于安装靠背垫的第一安装部，沿第一方向，所述第一安装部朝向后侧倾斜。
  6. 根据权利要求5所述的折叠轮椅，其特征在于，
    所述转轴点g相对于所述座椅支架的中心面的垂直距离为X，所述转轴点g相对于所述第一安装部的中心面的垂直距离Y，且X、Y满足60mm≤X+Y≤110mm。
  7. 根据权利要求6所述的折叠轮椅，其特征在于，所述座椅支架相对于支撑所述折叠轮椅的轮组的支撑面倾斜设置，且所述座椅支架远离所述转轴点g的一端向上倾斜；
    所述座椅支架配置为所述第一安装部逆时针转动以对所述折叠轮椅进行折叠时，所述座椅支架能够逆时针转动；
    以及，所述折叠轮椅处于折叠状态时，所述座椅支架的中心面与所述支撑面平行。
  8. 根据权利要求7所述的折叠轮椅，其特征在于，所述第一安装部的后倾角的角度范围为5°～20°；
    所述座椅支架的倾斜角的角度范围为2°～8°。
  9. 根据权利要求1至8中任一项所述的折叠轮椅，其特征在于，所述折叠轮椅包括前轮、后轮及支撑轮；
    所述前轮安装在所述前支撑架上，所述后轮安装在后支撑架上；
    所述支架连杆包括主体段和延伸段，其中所述主体段设置于所述后支撑架与所述前支撑架之间，所述延伸段布置在所述后支撑架的外侧；
    所述延伸段倾斜向下布置，并与所述主体段之间的夹角为钝角；
    所述支撑轮设置在所述延伸段远离所述主体段的一端，且所述支撑轮配置为所述折叠轮椅呈折叠状态时，所述支撑轮、所述后轮均与所述支撑面抵接。
  10. 根据权利要求1所述的折叠轮椅，其特征在于，所述折叠轮椅还包括锁钩机构；
    所述锁钩机构包括联动杆以及至少一个锁钩，所述锁钩设置在所述联动杆的端部； 所述锁钩转动连接在所述靠背支架上，且两者之间设置有扭簧，所述扭簧用于向所述锁钩提供锁紧力；
    所述后支撑架设置有与所述锁钩配合的固定销，所述锁钩设置有与所述固定销配合的限位槽，所述锁钩通过所述限位槽卡合至所述固定销。
  11. 根据权利要求10所述的折叠轮椅，其特征在于，所述锁钩机构包括两个锁钩，两个所述锁钩对称设置在所述联动杆两端；
    所述锁钩设置有扳手，所述靠背支架设置有定位凸起，所述扳手配置为其与所述定位凸起抵接时，所述锁钩的限位槽卡合至所述固定销。
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CN212816829U (zh) * 2020-04-02 2021-03-30 上海威之群机电制品有限公司 一种轻型便捷的电动折叠轮椅

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