Support frame structure and folding wheelchair

Abstract

The utility model relates to the field of wheelchair, especially a support frame structure and folding wheelchair, including two chair frames, support frame and the locking structure for blocking the folding of support frame, the folding wheelchair passes through setting up the support frame between two chair frames, and one end of two support arms is hinged to the chair frame, and the other end is hinged to each other, thereby forming the structure of V type, and the two support arms gradually close and move down when folding, utilize the longitudinal space of chair frame, prevent the height of wheelchair from being raised after folding, and moreover still be provided with locking structure, when the wheelchair is pressed under the gravity of user, the baffle on one connecting rod bears against the upper side of another connecting rod, prevents two connecting rods from hinging and moving, utilizes two connecting rods to prop open two support arms, makes two support arms keep the unfolded state, and then effectively prevents the folding of wheelchair, solves the technical prejudice of V type support frame structure in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of wheelchairs, and in particular to a support frame structure and a folding wheelchair. Background Technology

[0002] Wheelchairs, as important mobility aids, play an indispensable role in the daily lives of the elderly, those recovering from injuries and illnesses, and people with disabilities. To facilitate transportation and storage, folding wheelchairs have become the mainstream product in the market. Referring to the utility model patent with publication number CN211485302U and patent name "A Folding Structure for a Wheelchair", it can be seen that most folding wheelchairs on the market currently use an X-shaped cross bracket structure as the main folding scheme. This bracket structure includes a first bracket and a second bracket that are hinged to each other in an X shape. The upper ends of the first bracket and the second bracket are both hinged to the upper part of the wheelchair frame, and the lower parts are both hinged to the lower part of the wheelchair frame. The hinge point is located in the middle. When folding, the upper parts of the first bracket and the second bracket, along with the upper crossbar, will also move upward. The height of their highest point usually increases significantly, causing the overall height of the wheelchair to increase with folding, which takes up a lot of space.

[0003] Therefore, how to fold a wheelchair while avoiding a significant increase in height is a pressing issue for those in the field. A V-shaped support structure has been designed, with the two supports hinged together at their bottoms. During folding, the supports move downwards, utilizing the space beneath the wheelchair to provide downward movement for the support structure, thus preventing a significant increase in height. However, existing wheelchair seats are made of flexible materials such as fabric. When a person sits down, their weight is concentrated downwards, which can press down and accidentally trigger the folding action, affecting the wheelchair's normal use. Therefore, there is currently a technical bias against this structural form within the industry, preventing its adoption. Utility Model Content

[0004] The present invention provides a support frame structure and a folding wheelchair to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a support frame structure, comprising a support frame and a locking structure for preventing the support frame from folding, wherein the support frame comprises two support arms distributed in a V-shape, the lower ends of the two support arms being hinged to each other, the locking structure comprising two connecting rods, one end of the two connecting rods being respectively hinged to the two support arms, and the other end being hinged to each other, wherein a baffle is provided along the upper edge of one connecting rod to abut against the upper side of the other connecting rod.

[0006] Furthermore, the length of the connecting rod is shorter than the length of the support arm, and one end of each connecting rod is hinged to the lower part of the two support arms.

[0007] Furthermore, the hinge joint of the two connecting rods is located above the hinge joint of the two supporting arms, and the baffle is disposed above the hinge joint of the two connecting rods.

[0008] Furthermore, the locking structure gradually slopes downward from both ends to the middle, and the baffle abuts against the upper side of the other connecting rod.

[0009] A folding wheelchair is also provided, comprising two chair frames and a support frame structure as mentioned above. The support frame is disposed between the two chair frames, and the ends of the two support arms that are far apart from each other are respectively hinged to the two chair frames. The bottom of the chair frame is provided with casters.

[0010] Furthermore, two support frames are provided, which are respectively located on the front and rear sides of the chair frame, and a transmission bar connects the two support frames.

[0011] Furthermore, each of the two support arms of the support frame has an extension portion extending from its bottom, and the extension portion is hinged to an auxiliary rod, the ends of which are respectively hinged to the two chair frames.

[0012] Furthermore, the top of the chair frame has a crossbar for mounting the seat cushion, and a mounting plate hinged to the support arm is provided on the lower side of the crossbar.

[0013] Furthermore, an armrest is provided at the top of the chair frame, and the armrest is hinged to the chair frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This folding wheelchair has a support frame between the two chair frames, with one end of each support arm hinged to the chair frame and the other end hinged to each other, thus forming a V-shaped structure. When folding, the two support arms gradually move closer together and downward, utilizing the longitudinal space of the chair frame to prevent the height of the wheelchair from increasing after folding. In addition, a locking structure is provided. When the wheelchair is pressed down by the user's weight, the baffle on one link abuts against the upper side of the other link to prevent the two links from hinged and moving. The two links are used to open the two support arms, keeping the two support arms in an unfolded state, thereby effectively preventing the wheelchair from folding and solving the technical prejudice of the existing industry against the V-shaped support frame structure. Attached Figure Description

[0015] Figure 1 This is a perspective view of the support frame in this utility model.

[0016] Figure 2 This is a front view of the support frame in its unfolded state in this utility model.

[0017] Figure 3 This is a schematic diagram of the support frame in its folded state in this utility model.

[0018] Figure 4 This is a schematic diagram of the structure of the present invention in its unfolded state.

[0019] Figure 5 This is a schematic diagram of the structure of this utility model in its folded state.

[0020] In the diagram: 1. Support frame; 2. Locking structure; 3. Chair frame; 10. Support arm; 20. Connecting rod; 111. Auxiliary rod; 201. Baffle; 301. Crossbar; 302. Pulley; 303. Armrest; 3011. Mounting plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] As shown in the attached figure, a support frame structure includes a support frame 1 and a locking structure 2 for preventing the support frame 1 from folding. The support frame 1 includes two support arms 10 arranged in a V-shape, i.e., the two support arms 10 are symmetrically distributed. The lower ends of the two support arms 10 are hinged to each other. Each lower end of the two support arms 10 is provided with a through hole. The two through holes overlap and are connected by a screw to form a hinged structure. The locking structure 2 includes two connecting rods 20, which are symmetrically distributed. One end of each connecting rod 20 is hinged to the two support arms 10, and the other end is hinged to each other. The ends of the two connecting rods 20 that are close to each other are provided with through holes. The hinged structure of the two connecting rods 20 is achieved by using a screw to pass through the two through holes. The upper edge of one of the connecting rods 20... A baffle 201 is provided that abuts against the upper side of the other connecting rod 20. When the wheelchair is folded, the angle between the two support arms 10 is at its minimum, and the two connecting rods 20 are inverted V-shaped with the angle at its minimum. As the wheelchair unfolds, the two support arms 10 also unfold. When the two support arms 10 unfold to their maximum angle, the two connecting rods 20 unfold along with the support arms 10, gradually changing from an inverted V-shaped structure to a horizontal straight line or a positive V-shaped structure. If the user sits down at this time, the baffle 201 on the connecting rod 20 will press against the other connecting rod 20 due to the downward pressure of gravity, thereby preventing the two connecting rods 20 from continuing to move. The locking structure 2 provides a barrier to prevent the two support arms 10 from folding, avoiding the risk of accidentally triggering the folding action.

[0023] Specifically, the length of the connecting rod 20 is shorter than the length of the support arm 10. One end of each connecting rod 20 is hinged to the lower part of the two support arms 10. Preferably, the length of the connecting rod 20 is more than half the length of the support arm 10, and one end of the connecting rod 20 is connected to the middle and lower part of the support arm 10. Figure 1-3 A through hole is made in the lower middle part of the support arm 10, and another through hole is made at one end of the connecting rod 20. A screw is passed through both through holes and connected to the screw with a nut, thus forming a hinge structure between the connecting rod 20 and the support arm 10. The hinge point of the two connecting rods 20 is located above the hinge point of the two support arms 10. The baffle 201 is set above the hinge point of the two connecting rods 20. The hinge points of the two connecting rods 20 and the hinge points of the two support arms 10 are vertically corresponding, that is, on the same vertical line, to ensure the smoothness of the wheelchair unfolding or folding.

[0024] refer to Figure 2 Based on this, the locking structure 2 gradually slopes downwards from both ends to the middle, and the baffle 201 abuts against the upper side of the other connecting rod 20. The main function of the locking structure 2 is to prevent the user from accidentally triggering the folding action after sitting down. When the wheelchair is in the unfolded state, both connecting rods 20 are also in the unfolded state, that is, the middle hinge slightly downwards to form an upward-facing V-shaped structure. At this time, when the user sits on the wheelchair, the weight is concentrated downwards. However, because the baffle 201 on one connecting rod 20 abuts against the upper side of the other connecting rod 20, the two connecting rods 20 are prevented from continuing to swing, thus achieving the effect of preventing the wheelchair from folding. If folding is required, the baffle 201 can be lifted to make the two connecting rods 20 gradually swing downwards, that is, the hinge... With the joints facing upwards, an inverted V-shaped structure with the opening facing downwards is formed. At this point, the two chair frames 3 can be pushed closer to each other. As the two chair frames 3 approach each other, the two connecting rods 20 move closer together, and the opening angle of the inverted V-shaped structure gradually decreases. At the same time, the two support arms 10 move closer together, and the opening angle of the V-shaped structure formed by the two support arms 10 also gradually decreases. While the two support arms 10 move closer together, because the lower part of the wheelchair has a certain depth space, wheels with a certain height are also set at the bottom of the chair frame 3 to provide space for the two support arms 10 to move, so that the height of the folded wheelchair does not change.

[0025] As attached Figure 4-5 As shown, a folding wheelchair includes two chair frames 3 and the aforementioned support frame structure. The support frame 1 is disposed between the two chair frames 3. The ends of the two support arms 10, which are far apart from each other, are respectively hinged to the two chair frames 3. Specifically, the upper parts of the two chair frames 3 are respectively hinged to the two support arms 10, and the upper ends of the two support arms 10 are respectively hinged to the two chair frames 3, while the lower ends are hinged to each other. The length of the support arm 10 corresponds to the height of the chair frame 3. The bottom of the chair frame 3 is provided with casters 302. The presence of casters 302 at the bottom of the chair frame 3 is a common structure in wheelchairs. The support frame 1 utilizes the depth space provided by the casters 302 and the height of the chair frame 3 for folding, and the height of the support frame 1 does not protrude after folding.

[0026] Specifically, two support frames 1 are provided, which are respectively located on the front and rear sides of the chair frame 3 to ensure balanced force on the wheelchair. At the same time, a transmission bar 11 is connected between the two support frames 1 to ensure that the two support frames 1 can be folded or unfolded synchronously. The transmission bar 11 is specifically connected to one of the corresponding support arms 10 of the two support frames 1. For example, both ends of the transmission bar 11 are connected to the left or right support arm 10 of the two support frames 1, or two transmission bars 11 are provided, one transmission bar 11 is connected to the left support arm 10 of the two support frames 1, and the other transmission bar 11 is connected to the right support arm 10 of the two support frames 1. Considering the placement of the wheelchair motor, the transmission bar 11 can be set in a curved shape to provide space for motor installation.

[0027] Specifically, the bottom of each of the two support arms 10 of the support frame 1 is provided with an extension portion, and the extension portion is hinged to an auxiliary rod 111. The ends of the two auxiliary rods 111 are respectively hinged to the two chair frames 3. As shown in the figure, the two support arms 10 of the support frame 1 each extend downward at the hinge point to form an X-shaped support frame 1 structure that is larger at the top and smaller at the bottom. However, the extension portion is not directly connected to the chair frame 3, but is connected through the auxiliary rod 111, which further improves the support performance and load-bearing capacity of the support frame 1.

[0028] Specifically, the chair frame 3 has a crossbar 301 at the top for mounting a seat cushion, which is a common structure in existing wheelchairs. Existing wheelchairs also typically include a seat cushion made of flexible material such as fabric on the crossbar 301 for the user to sit on. The support frame 1 utilizes the crossbar 301 structure, with a mounting plate 3011 hinged to the support arm 10 on the lower side of the crossbar 301. The mounting plate 3011 has hinge holes, and the upper end of the support arm 10 also has hinge holes. The two hinge holes are connected by a screw to form a hinged connection. The chair frame 3 has an armrest 303 at the top, which is hinged to the chair frame 3, similar to existing wheelchair structures. The armrest 303 is mainly used for pushing the wheelchair user from behind. The armrest 303 is hinged to the chair frame 3 via a hinge, allowing it to be folded close to the crossbar 301 for easier storage.

[0029] This utility model provides a support frame 1 between two chair frames 3. One end of each of the two support arms 10 is hinged to the chair frame 3, and the other end is hinged to each other, forming a V-shaped structure. When folded, the two support arms 10 gradually move closer together and downward, utilizing the longitudinal space of the chair frame 3 to prevent the height of the wheelchair from increasing after folding. Furthermore, a locking structure 2 is provided. When the wheelchair is pressed down by the user's weight, the baffle 201 on one link 20 abuts against the upper side of the other link 20, preventing the hinged movement of the two links 20. The two links 20 are used to open the two support arms 10, keeping the two support arms 10 in an extended state, thereby effectively preventing the wheelchair from folding and overcoming the existing industry's technical prejudice against the V-shaped support frame 1 structure.

[0030] The above embodiments are preferred embodiments of this utility model. All structures similar to this utility model and equivalent changes thereof should fall within the protection scope of this utility model.

Claims

1. A support frame structure, characterized in that: It includes a support frame (1) and a locking structure (2) for preventing the support frame (1) from folding. The support frame (1) includes two support arms (10) distributed in a V shape. The lower ends of the two support arms (10) are hinged to each other. The locking structure (2) includes two connecting rods (20). One end of the two connecting rods (20) is respectively hinged to the two support arms (10), and the other end is hinged to each other. One of the connecting rods (20) is provided with a baffle (201) that abuts against the upper side of the other connecting rod (20).

2. The support frame structure according to claim 1, characterized in that: The length of the connecting rod (20) is shorter than the length of the support arm (10), and one end of each connecting rod (20) is hinged to the lower part of the two support arms (10).

3. The support frame structure according to claim 1, characterized in that: The hinge joint of the two connecting rods (20) is located above the hinge joint of the two supporting arms (10), and the baffle (201) is disposed above the hinge joint of the two connecting rods (20).

4. The support frame structure according to claim 3, characterized in that: The locking structure (2) gradually slopes downward from both ends to the middle, and the baffle (201) abuts against the upper side of the other connecting rod (20).

5. A folding wheelchair, characterized in that: It includes two chair frames and a support frame structure according to any one of claims 1-4, wherein the support frame (1) is disposed between the two chair frames (3), and the ends of the two support arms (10) that are far apart from each other are respectively hinged to the two chair frames (3).

6. A folding wheelchair according to claim 5, characterized in that: There are two support frames (1), which are respectively located on the front and rear sides of the chair frame (3), and a transmission bar (11) is connected between the two support frames (1).

7. A folding wheelchair according to claim 6, characterized in that: The bottom of each of the two support arms (10) of the support frame (1) is provided with an extension portion, and the extension portion is hinged with an auxiliary rod (111). The ends of the two auxiliary rods (111) are respectively hinged to the two chair frames (3). The bottom of the chair frame (3) is provided with a pulley (302).

8. A folding wheelchair according to claim 5, characterized in that: The chair frame (3) has a crossbar (301) at the top for mounting a seat cushion, and a mounting plate (3011) hinged to the support arm (10) is provided on the lower side of the crossbar (301).

9. A folding wheelchair according to claim 5, characterized in that: The chair frame (3) is provided with an armrest (303) at the top, and the armrest (303) is hinged to the chair frame (3).

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