Electrically adjustable leg rest for electrically powered wheelchairs

Abstract

The utility model discloses an electrically adjusted leg support of electric wheelchair relates to electric wheelchair technical field. The device includes the mounting plate, first electric telescopic link, second electric telescopic link, connecting block and foot support subassembly, the mounting plate top is equipped with the mounting block of wheelchair seat rotation connection. The electrically adjusted leg support of electric wheelchair through first electric telescopic link control mounting plate around mounting block and carry out the rotation angle, realize the collaborative adaptation of leg support and wheelchair seat posture, through the connecting block of second electric telescopic link drive end connection can drive both sides foot support subassembly synchronous before and after moving, when first electric telescopic link adjustment mounting plate angle, because the position difference exists between human calf and leg support rotation axis, the support length required to leg changes with angle, second electric telescopic link can promote the connecting block and foot support subassembly compensation length difference in time, ensure that foot always and foot support subassembly fit, calf and mounting plate support surface close contact.

Description

Technical Field

[0001] This utility model relates to the field of electric wheelchair technology, and in particular to an electrically adjustable leg rest for an electric wheelchair. Background Technology

[0002] With the continuous development of electric wheelchair technology, users' requirements for riding comfort are increasing. As an important component of electric wheelchairs, the adjustability of the leg rest directly affects the user experience.

[0003] Currently, many electric wheelchairs are equipped with adjustable leg rests to improve leg support comfort. However, most existing electrically adjustable leg rests have relatively simple functions, commonly featuring designs where the leg rest angle is linked to the seat back or independently electrically adjustable. In these designs, when the leg rest rotates around its fixed axis to change angle, the user's feet move significantly forward and backward because the natural posture of the lower leg does not coincide with the mechanical rotation axis of the leg rest. This movement makes it difficult to maintain a constant fit between the lower leg and the leg rest support surface, often resulting in the leg separating from the support and becoming suspended, or the foot being pushed forward, creating a feeling of pressure, severely affecting the comfort of long-term riding. Utility Model Content

[0004] This utility model provides an electrically adjustable leg rest for an electric wheelchair, which can solve the problem mentioned in the background art that it is difficult to maintain a constant fit between the lower leg and the leg rest support surface, often resulting in the leg separating from the support and becoming suspended, or the foot being pushed forward and causing a feeling of pressure, which seriously affects the comfort of long-term riding.

[0005] An electrically adjustable leg rest for an electric wheelchair includes a mounting plate, a first electrically telescopic rod, a second electrically telescopic rod, a connecting block, and a footrest assembly. The mounting plate has a mounting block mounted on its top, which is rotatably connected to the wheelchair seat. The drive end of the first electrically telescopic rod is hinged to the mounting block and mounted on the bottom of the wheelchair seat. The second electrically telescopic rod is mounted on one side of the mounting plate. The connecting block is connected to the drive end of the second electrically telescopic rod and is located at the bottom of the mounting plate. The footrest assembly is mounted on both sides of the connecting block.

[0006] The electric adjustable leg rest for an electric wheelchair provided by this utility model has the following beneficial effects compared with the prior art: The electrically adjustable leg rest of this electric wheelchair controls the rotation angle of the mounting plate around the mounting block via a first electric telescopic rod, achieving coordinated adaptation between the leg rest and the wheelchair seat posture. The connecting block connected to the drive end of the second electric telescopic rod can drive the footrest assemblies on both sides to move back and forth synchronously. When the first electric telescopic rod adjusts the angle of the mounting plate, due to the positional difference between the human lower leg and the rotation axis of the leg rest, the required support length of the leg will change with the angle. At this time, the second electric telescopic rod can push the connecting block and the footrest assembly in real time to compensate for the length difference, ensuring that the foot is always in close contact with the footrest assembly and the lower leg is in close contact with the support surface of the mounting plate. This avoids the problem of the foot being suspended or pressured when adjusting the angle of the traditional leg rest, greatly improving the comfort and support stability of long-term sitting.

[0007] Furthermore, the mounting plate is equipped with retaining components on both sides, and a protective plate connected to the mounting block is provided on the outside of the mounting plate.

[0008] Furthermore, the retaining bracket assembly is detachably connected to the mounting plate via fixing bolts, and the mounting plate has multiple mounting holes at equal intervals on both sides that are adapted to the fixing bolts.

[0009] Furthermore, the footrest assembly includes a connecting plate and a footrest plate. The connecting plate is detachably connected to the connecting block via connecting bolts, and the footrest plate is connected to the connecting plate via a rotating shaft. A limiting bolt located on the side of the footrest plate is installed at the bottom of the connecting plate.

[0010] Furthermore, the connecting plate has multiple connecting holes in the vertical direction that are compatible with the connecting bolts.

[0011] Furthermore, the connecting plate has multiple limiting holes in the horizontal direction that are compatible with the limiting bolts.

[0012] Furthermore, the support assembly includes a fixed plate, a support leg plate, and a stop leg plate. The fixed plate is detachably connected to the mounting plate by fixing bolts. The support leg plate is connected to the stop leg plate by connecting sheet metal. The fixed plate is connected to the connecting sheet metal by an adjusting component.

[0013] Furthermore, the adjusting component includes a first adjusting rod and a second adjusting rod. One end of the first adjusting rod is connected to the fixing plate via a first locking bolt, and the other end of the first adjusting rod is connected to the second adjusting rod via a second locking bolt. The second adjusting rod is connected to the connecting sheet metal via a third locking bolt.

[0014] Furthermore, the connecting sheet metal is detachably connected to the leg support plate and the leg guard plate.

[0015] Furthermore, rollers are installed in the middle and bottom of the protective plate. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the electrically adjustable leg rest of the electric wheelchair according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the electrically adjustable leg rest of the electric wheelchair according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a cross-sectional view of the electrically adjustable leg rest of the electric wheelchair according to an embodiment of the present utility model; Figure 4 for Figure 1 Schematic diagram of the structure of the center-mounted pole mounting assembly; Figure 5 for Figure 1 Installation diagram of the center-mounted pole mounting assembly.

[0017] Explanation of reference numerals in the attached figures: 1. Mounting plate; 2. Mounting block; 3. First electric telescopic rod; 4. Second electric telescopic rod; 5. Connecting block; 6. Footrest assembly; 7. Support assembly; 8. Wheelchair seat; 9. Protective plate; 10. Fixing bolt; 11. Mounting hole; 12. Roller; 61. Connecting plate; 62. Footrest plate; 63. Connecting bolt; 64. Rotating shaft; 65. Limiting bolt; 66. Connecting hole; 67. Limiting hole; 71. Fixing plate; 72. Leg support plate; 73. Leg support plate; 74. Adjusting component; 75. Connecting sheet metal; 741. First adjusting rod; 742. Second adjusting rod; 743. First locking bolt; 744. Second locking bolt; 745. Third locking bolt. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, in the attached diagram, the X-axis represents the vertical direction, that is, the front-to-back position, and the positive direction of the X-axis (that is, the direction the arrow points to) represents the front, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the back; in the attached diagram, the Y-axis represents the horizontal direction, that is, the left-to-right position, and the positive direction of the Y-axis (that is, the direction the arrow points to) represents the left, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the right; in the attached diagram, the Z-axis represents the vertical direction, that is, the up-to-down position, and the positive direction of the Z-axis (that is, the direction the arrow points to) represents the up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the down.

[0022] It should also be noted that the aforementioned X-axis, Y-axis and Z-axis are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, components, or groups of features, integers, steps, or components.

[0025] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] like Figure 1-3 As shown, this utility model proposes an electrically adjustable leg rest for an electric wheelchair, including a mounting plate 1, a first electric telescopic rod 3, a second electric telescopic rod 4, a connecting block 5, and a footrest assembly 6. The mounting plate 1 has a mounting block 2 mounted on its top, which is rotatably connected to the wheelchair seat 8. The driving end of the first electric telescopic rod 3 is hinged to the mounting block 2 and is mounted on the bottom of the wheelchair seat 8. The second electric telescopic rod 4 is mounted on one side of the mounting plate 1. The connecting block 5 is connected to the driving end of the second electric telescopic rod 4 and is located at the bottom of the mounting plate 1. The footrest assembly 6 is mounted on both sides of the connecting block 5.

[0027] In this embodiment, the mounting block 2 on the top of the mounting plate 1 is rotatably connected to the wheelchair seat 8, providing a stable rotational basis for adjusting the leg rest angle. At the same time, the drive end of the first electric telescopic rod 3 is hinged to the mounting block 2 and installed at the bottom of the wheelchair seat 8. The rotation angle of the mounting plate 1 around the mounting block 2 can be controlled by telescopic control, realizing the coordinated adaptation of the leg rest and the posture of the wheelchair seat 8. The connecting block 5 connected to the drive end of the second electric telescopic rod 4 can drive the footrest assemblies 6 on both sides to move back and forth synchronously. When the first electric telescopic rod 3 adjusts the angle of the mounting plate 1, the required support length of the leg will change with the angle due to the positional difference between the human lower leg and the rotation axis of the leg rest. At this time, the second electric telescopic rod 4 can push the connecting block 5 and the footrest assembly 6 in real time to compensate for the length difference, ensuring that the foot is always in contact with the footrest assembly 6 and the lower leg is in close contact with the support surface of the mounting plate 1. This avoids the problem of the foot being suspended or pressured when adjusting the leg rest angle in the traditional way, greatly improving the comfort and support stability of long-term sitting.

[0028] Specifically, the electric wheelchair is equipped with electrical control devices for controlling the operation of the first electric telescopic rod 3 and the second electric telescopic rod 4.

[0029] Among them, such as Figure 5 The image shows the installation position of the electrically adjustable leg rest on the electric wheelchair.

[0030] like Figure 1 and Figure 2 As shown, both sides of the mounting plate 1 are equipped with retaining components 7, and the outside of the mounting plate 1 is provided with a protective plate 9 connected to the mounting block 2.

[0031] In this embodiment, by adding the support components 7 on both sides of the mounting plate 1, stable and reliable lateral support and wrapping are provided for the user's lower legs, effectively preventing the legs from slipping to the side due to inertia when the wheelchair moves or turns, significantly improving the safety of use; at the same time, the protective plate 9 covering the outside of the mounting plate 1 and connected to the mounting block 2 constitutes a complete protective shell, which can effectively prevent the user's trouser legs, shoelaces or external debris from being caught in the mounting plate 1 and the internal movement mechanism, which not only ensures the safety of the user, but also avoids interference and wear of the mechanical structure and extends the service life of the leg support.

[0032] like Figure 1 and Figure 2 As shown, the retaining bracket 7 is detachably connected to the mounting plate 1 by fixing bolts 10. The mounting plate 1 has multiple mounting holes 11 at equal intervals on both sides that are compatible with the fixing bolts 10.

[0033] In this embodiment, the leg support assembly 7 is detachably connected to the mounting plate 1 via fixing bolts 10. Simultaneously, the mounting plate 1 has multiple equally spaced mounting holes 11 on both sides, allowing the user to quickly and flexibly adjust the vertical height of the entire leg support assembly 7 simply by loosening the fixing bolts 10. This not only allows the leg support to accurately adapt to different users' calf thicknesses and sitting habits, greatly improving comfort and personalization, but its detachable connection also provides great convenience for independent cleaning, maintenance, or replacement of the leg support assembly 7, effectively improving the product's usability and lifespan.

[0034] like Figure 2 and Figure 3 As shown, the foot support assembly 6 includes a connecting plate 61 and a foot support plate 62. The connecting plate 61 is detachably connected to the connecting block 5 via a connecting bolt 63. The foot support plate 62 is connected to the connecting plate 61 via a rotating shaft 64. A limiting bolt 65 located on the side of the foot support plate 62 is installed at the bottom of the connecting plate 61.

[0035] In this embodiment, the connecting plate 61 is detachably connected to the connecting block 5 using connecting bolts 63, making the installation and maintenance of the entire footrest extremely convenient. At the same time, the footrest plate 62 is hinged to the connecting plate 61 via a rotating shaft 64, and the rotation range of the footrest plate 62 is constrained by the limiting bolts 65 installed at the bottom of the connecting plate 61. This allows users to flexibly adjust and lock the tilt angle of the footrest plate 62 according to the natural downward angle of their feet or specific rehabilitation needs, thus providing a key structural guarantee for achieving precise and comfortable foot support and effectively avoiding fatigue and discomfort caused by the ankle being in an unnatural posture for a long time.

[0036] like Figure 3 As shown, the connecting plate 61 has multiple connecting holes 66 in the vertical direction that are compatible with the connecting bolts 63.

[0037] In this embodiment, by opening multiple connecting holes 66 in the vertical direction of the connecting plate 61 and cooperating with the connecting bolts 63, the overall installation height of the footrest assembly 6 can be adjusted in multiple levels and with precision according to the specific needs of different users. The vertical position of the footrest plate 62 can be flexibly adjusted, thereby ensuring that no matter the user's leg length, their feet can be supported at the most ergonomic and comfortable height, which greatly improves the personalized adaptability of the legrest and the overall comfort of use.

[0038] like Figure 3 As shown, the connecting plate 61 has multiple limiting holes 67 in the horizontal direction that are compatible with the limiting bolts 65.

[0039] In this embodiment, multiple limiting holes 67 opened in the horizontal direction of the connecting plate 61, through cooperation with limiting bolts 65 at different positions, realize multi-level, adjustable limiting of the rotation angle of the footrest 62 around the rotation axis 64. Users can precisely set the extreme downward or upward angle of the footrest 62 according to their individual foot size and comfort preferences, providing highly personalized foot support positioning, effectively preventing discomfort and injury risks caused by excessive ankle dorsiflexion or plantarflexion, and ensuring the stability and reliability of the adjusted angle through mechanical limiting.

[0040] like Figure 2 and Figure 4 As shown, the support assembly 7 includes a fixed plate 71, a support leg plate 72, and a stop leg plate 73. The fixed plate 71 is detachably connected to the mounting plate 1 by fixing bolts 10. The support leg plate 72 is connected to the stop leg plate 73 by connecting sheet metal 75. The fixed plate 71 is connected to the connecting sheet metal 75 by adjusting member 74.

[0041] In this embodiment, the fixing plate 71 is detachably connected to the mounting plate 1 via fixing bolts 10, facilitating overall assembly and disassembly. The leg support plate 72 and the leg guard plate 73 are rigidly connected via connecting sheet metal 75, together forming a stable L-shaped support unit. While providing comfortable support for the lower leg, it effectively prevents the lower leg from slipping to the side, significantly improving safety. The fixing plate 71 is connected to the connecting sheet metal 75 via an independent adjusting component 74, allowing the support unit to be finely adjusted in front and back position independently without disassembling the entire component. This precisely adapts to the user's lower leg length, achieving a high degree of personalization in the support position and greatly improving comfort.

[0042] like Figure 2 and Figure 4 As shown, the adjusting component 74 includes a first adjusting rod 741 and a second adjusting rod 742. One end of the first adjusting rod 741 is connected to the fixing plate 71 through a first locking bolt 743, and the other end of the first adjusting rod 741 is connected to the second adjusting rod 742 through a second locking bolt 744. The second adjusting rod 742 is connected to the connecting sheet metal 75 through a third locking bolt 745.

[0043] In this embodiment, the adjusting member 74 is a telescopic structure composed of a first adjusting rod 741 and a second adjusting rod 742, and is connected to the fixing plate 71 and another adjusting rod by a first locking bolt 743 and a second locking bolt 744 respectively, and is then fixed to the connecting sheet metal 75 by a third locking bolt 745. Together, they realize a length-adjustable mechanism, so that the overall support part of the stop assembly 7 can be flexibly and stably adjusted in the front and rear direction relative to the mounting plate 1, thereby accurately adapting to the lower leg length of different users and ensuring that the knee bend can be comfortably placed in the optimal position on the support surface.

[0044] Specifically, the connecting sheet metal 75 is detachably connected to the leg support plate 72 and the leg guard plate 73.

[0045] like Figure 1 and Figure 2 As shown, rollers 12 are installed in the middle and bottom of the protective plate 9.

[0046] In this embodiment, rollers 12 are installed in the middle and bottom of the protective plate 9. This structure allows the protective plate 9 to roll into contact with the wheelchair footrest or the ground via the rollers 12 when the entire leg rest rotates around the mounting block 2 to adjust its angle. This not only transforms the potential rigid sliding friction into low-resistance rolling friction, ensuring a smooth and stable leg rest adjustment process and significantly reducing noise, but more importantly, the rollers 12 effectively prevent direct scratching between the protective plate 9 and the contact surface, significantly reducing wear on the protective plate 9, thereby greatly extending its service life and maintaining the integrity of the product's appearance.

[0047] Working principle: During operation, when the leg support angle needs to be adjusted, the first electric telescopic rod 3 extends or retracts, driving the mounting block 2 to rotate the entire mounting plate 1 and lower mechanism around its connection point with the wheelchair seat 8. At the same time, the second electric telescopic rod 4 works in coordination, driving the connecting block 5 and the foot support assemblies 6 on both sides to slide along the mounting plate 1. Through this intelligent linkage of angle and length, the displacement of the support surface caused by the change of the rotation center is automatically compensated, ensuring that the user's lower leg and the leg support plate 72 always remain stably in contact. The user can also adjust the front and rear position of the support part through the adjusting piece 74, and finely customize the height of the leg support and the tilt angle of the foot support plate 62 by selecting different mounting holes 11 and limiting holes 67, thereby achieving all-round personalized comfort support.

[0048] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. An electrically adjustable leg rest for an electric wheelchair, characterized in that, include: Mounting plate (1), the top of which is mounted with mounting block (2) which is rotatably connected to wheelchair seat (8); The first electric telescopic rod (3) has its driving end hinged to the mounting block (2) and installed at the bottom of the wheelchair seat (8); The second electric telescopic rod (4) is installed on one side of the mounting plate (1); Connecting block (5), the connecting block (5) is connected to the drive end of the second electric telescopic rod (4) and is located at the bottom of the mounting plate (1); Foot support assembly (6), which is mounted on both sides of the connecting block (5).

2. The electrically adjustable leg rest of the electric wheelchair as described in claim 1, characterized in that, The mounting plate (1) is equipped with a retaining component (7) on both sides, and a protective plate (9) connected to the mounting block (2) is provided on the outside of the mounting plate (1).

3. The electrically adjustable leg rest of the electric wheelchair as described in claim 2, characterized in that, The retaining component (7) is detachably connected to the mounting plate (1) by fixing bolts (10). The mounting plate (1) has multiple mounting holes (11) at equal intervals on both sides that are compatible with the fixing bolts (10).

4. The electrically adjustable leg rest of the electric wheelchair as described in claim 1, characterized in that, The footrest assembly (6) includes a connecting plate (61) and a footrest plate (62). The connecting plate (61) is detachably connected to the connecting block (5) by a connecting bolt (63). The footrest plate (62) is connected to the connecting plate (61) by a rotating shaft (64). A limiting bolt (65) located on the side of the footrest plate (62) is installed at the bottom of the connecting plate (61).

5. The electrically adjustable leg rest of the electric wheelchair as described in claim 4, characterized in that, The connecting plate (61) has multiple connecting holes (66) in the vertical direction that are compatible with the connecting bolts (63).

6. The electrically adjustable leg rest of the electric wheelchair as described in claim 4, characterized in that, The connecting plate (61) has multiple limiting holes (67) in the horizontal direction that are compatible with the limiting bolts (65).

7. The electrically adjustable leg rest of the electric wheelchair as described in claim 2, characterized in that, The support assembly (7) includes a fixed plate (71), a leg support plate (72) and a leg stop plate (73). The fixed plate (71) is detachably connected to the mounting plate (1) by a fixing bolt (10). The leg support plate (72) is connected to the leg stop plate (73) by a connecting sheet metal (75). The fixed plate (71) is connected to the connecting sheet metal (75) by an adjusting component (74).

8. The electrically adjustable leg rest of the electric wheelchair as described in claim 7, characterized in that, The adjusting component (74) includes a first adjusting rod (741) and a second adjusting rod (742). One end of the first adjusting rod (741) is connected to the fixing plate (71) by a first locking bolt (743), and the other end of the first adjusting rod (741) is connected to the second adjusting rod (742) by a second locking bolt (744). The second adjusting rod (742) is connected to the connecting sheet metal (75) by a third locking bolt (745).

9. The electrically adjustable leg rest of the electric wheelchair as described in claim 7, characterized in that, The connecting sheet metal (75) is detachably connected to the leg support plate (72) and the leg guard plate (73).

10. The electrically adjustable leg rest of the electric wheelchair as described in claim 2, characterized in that, Rollers (12) are installed in the middle and bottom of the protective plate (9).

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