State adjustment device and wheelchair

Abstract

The present invention provides a state adjustment device for adjusting the state of a backrest assembly relative to a seat cushion assembly. The backrest assembly is rotatably mounted on the seat cushion assembly. The state adjustment device includes a mating component and an adjustment component. The mating component is mounted to a first one of the seat cushion assembly and the backrest assembly. The mating component is provided with a locking groove. The adjustment component is mounted to a second one of the seat cushion assembly and the backrest assembly. The adjustment component is provided with a locking shaft. The backrest assembly is configured to be rotatable to a first position. In the first position, the locking shaft is snapped into the locking groove. Thereby, the backrest assembly is in a backrest unfolded state relative to the seat cushion assembly. The present invention also provides a wheelchair including the above state adjustment device. The above state adjustment device can independently and conveniently adjust the state of the backrest assembly relative to the seat cushion assembly.

Description

Technical Field

[0001] The present invention relates to a wheelchair, and more particularly, to a state adjustment device that can adjust the state of a backrest assembly relative to a seat cushion assembly. Background Art

[0002] At present, folding wheelchairs on the market basically adopt two methods for folding. The first is that the two side frames of the wheelchair are folded inward. For wheelchairs folded in this way, the backrest part or the backrest assembly and the left and right frames are respectively fixed together and cannot be folded separately. The second is to use a multi-link mechanism for folding. The backrest assembly is part of its link structure, and the backrest assembly is also folded simultaneously when the wheelchair is folded. The folding wheelchairs of these two solutions have almost reached the limit after years of development, but the volume is still relatively large. The inventor found that in the prior art, no matter which folding method is used, the position of the backrest assembly of the folding wheelchair after folding is fixed together with other structures of the wheelchair and cannot be unfolded separately. The inventor believes that if the backrest assembly of the folding wheelchair can be unfolded separately, the structural adjustment or state adjustment of the entire wheelchair will be more flexible, and even more working modes can be provided.

[0003] Therefore, there is a need to provide a state adjustment device that can independently and conveniently adjust the state of the backrest assembly relative to the seat cushion assembly. Summary of the Invention

[0004] The object of the present invention is to provide a state adjustment device that can independently and conveniently adjust the state of the backrest assembly relative to the seat cushion assembly.

[0005] The present invention provides a state adjustment device for adjusting the state of a backrest assembly relative to a seat cushion assembly, wherein the backrest assembly is rotatably mounted on the seat cushion assembly. The state adjustment device includes a mating member and an adjustment assembly. The mating member is mounted to a first one of the seat cushion assembly and the backrest assembly. The mating member is provided with a locking groove. The adjustment assembly is mounted to a second one of the seat cushion assembly and the backrest assembly. The adjustment assembly is provided with a locking shaft. The backrest assembly is configured to be rotatable to a first position, in which the locking shaft is engaged in the locking groove, whereby the backrest assembly is in a backrest unfolded state relative to the seat cushion assembly.

[0006] In one embodiment, the state adjustment device further includes an unlocking assembly for disengaging the locking shaft from the locking groove.

[0007] In one embodiment, the unlocking assembly includes a trigger rod and a movable member. The trigger rod is rotatably mounted to the first party. The movable member is movably supported by the mating member and is pushed by one end of the trigger rod as the trigger rod rotates, thereby pushing the locking shaft out of the locking groove.

[0008] In one embodiment, the unlocking component further includes a second elastic member, and the elastic force of the second elastic member has a tendency to cause the trigger rod to push the movable member.

[0009] In one embodiment, the mating component provides a chute on each of its two sides; the movable member includes two side walls and a bottom wall that form a U shape, the two side walls are respectively in sliding fit with the chutes on the two sides of the mating component, the bottom wall is pushed by the trigger rod, and the free ends of the two side walls push the lock shaft.

[0010] In one embodiment, both ends of the lock groove in the groove length direction are respectively communicated with the chutes on the two sides of the mating component; convex portions protruding towards each other are respectively provided at the free ends of the two side walls, and the convex portions are blocked by the bottom of the lock groove.

[0011] In one embodiment, the mating component provides a smooth rolling surface for guiding the lock shaft to be inserted into the lock groove.

[0012] In one embodiment, the adjusting component further includes a bracket and a first elastic member, the bracket is rotatably mounted on the second party, the lock shaft is disposed at one end of the bracket, the first elastic member is disposed between the bracket and the second party, and the elastic force of the first elastic member has a tendency to keep the lock shaft inserted into the lock groove.

[0013] In one embodiment, the first party is the seat cushion component.

[0014] In one embodiment, the mating component further has a bayonet; the backrest component is arranged to be rotatable from the first position to the second position, and at the second position, the lock shaft is inserted into the bayonet, whereby the backrest component is in a fully unfolded state relative to the seat cushion component.

[0015] The present invention also provides a wheelchair including the aforementioned state adjusting device.

[0016] In one embodiment, the wheelchair includes a backrest component and a seat cushion component; in the backrest unfolded state, the included angle between the backrest component and the seat cushion component is 98 - 108°; and / or, in the fully unfolded state, the included angle between the backrest component and the seat cushion component is 188 - 198°.

[0017] In the above-mentioned state adjustment device, the matching component and the adjustment component are respectively installed on the seat cushion component and the backrest component. By inserting the locking shaft into the locking groove, the backrest component can be in the backrest unfolded state, and by separating the locking shaft from the locking groove, the backrest component can reach the folded state under the action of gravity, for example. The backrest component can be unfolded independently, and the operation is convenient, that is, the state of the backrest component relative to the seat cushion component can be adjusted independently and conveniently.

[0018] The above-mentioned state adjustment device further includes an unlocking component. The unlocking component includes a trigger rod and a movable part. By rotating the trigger rod, the movable part can be pushed via the trigger rod, and then the locking shaft can be pushed away from the locking groove via the movable part. The user only needs to manually pull the trigger rod, which can improve the comfort of operation. Moreover, when applied to other structures, especially wheelchairs with a foldable rear wheel assembly, it can be synchronously operated with the folding of the rear wheel assembly, facilitating the realization of overall automatic folding.

[0019] In the above-mentioned state adjustment device, the matching component is further provided with a bayonet. By passing the locking shaft over the locking groove and inserting it into the bayonet, the backrest component can be in the fully unfolded state. At this time, the backrest component can act as a handle, and other parts of the wheelchair can be used as the box body of a suitcase for dragging, especially when applied to a wheelchair with rollers provided below, which is particularly convenient for users. Brief Description of the Drawings

[0020] The above-mentioned and other features, properties and advantages of the present invention will become more obvious through the following description in conjunction with the drawings and embodiments, where:

[0021] Figure 1 is a schematic diagram exemplarily showing the cooperation between the state adjustment device and the backrest component.

[0022] Figure 2 is a schematic diagram exemplarily showing the bottom of the state adjustment device.

[0023] Figure 3 is a schematic diagram exemplarily showing the unlocking component.

[0024] Figure 4 is another schematic diagram exemplarily showing the unlocking component, where the position of the movable part is different from that in Figure 3 the figure.

[0025] Figure 5 is a schematic diagram exemplarily showing the cooperation between the unlocking component and the matching component.

[0026] Figure 6 is a schematic diagram exemplarily showing the matching component.

[0027] Figure 7 is another schematic diagram exemplarily showing the cooperation between the state adjustment component and the backrest component.

[0028] Figure 8 It is a schematic diagram exemplarily showing the wheelchair in the trunk mode.

[0029] Figure 9A It is a schematic diagram exemplarily showing the state adjustment device when the backrest assembly is in the folded position.

[0030] Figure 9B It is a schematic diagram exemplarily showing the state adjustment device when the backrest assembly is in the intermediate position between the folded position and the backrest position.

[0031] Figure 9C It is a schematic diagram exemplarily showing the state adjustment device when the backrest assembly is in the backrest position.

[0032] Figure 9D It is a schematic diagram exemplarily showing the state adjustment device when the backrest assembly is in the handle position.

[0033] Figure 10A It is a schematic diagram exemplarily showing the wheelchair, wherein the backrest assembly is in the backrest unfolded state, and both the front wheel assembly and the rear wheel assembly are in the unfolded state.

[0034] Figure 10B It is a schematic diagram exemplarily showing the wheelchair, wherein the front wheel assembly Figure 10A is folded from the unfolded state to the intermediate state, so that the front surface of the front wheel assembly can support the entire wheelchair.

[0035] Figure 10C It is a schematic diagram exemplarily showing the wheelchair, wherein the rear wheel assembly Figure 10B is folded from the unfolded state to the intermediate state.

[0036] Figure 10D It is a schematic diagram exemplarily showing the wheelchair, wherein the rear wheel assembly Figure 10C is further folded from this intermediate state to another intermediate state.

[0037] Figure 10E It is a schematic diagram exemplarily showing the wheelchair, wherein the rear wheel assembly Figure 10D is further folded from this another intermediate state to the folded state.

[0038] Figure 10F It is a schematic diagram exemplarily showing the wheelchair, wherein the backrest assembly Figure 10E is folded from the backrest unfolded state to the intermediate state.

[0039] Figure 10G It is a schematic diagram exemplarily showing the wheelchair, wherein the backrest assembly Figure 10F is folded from the intermediate state to the folded state.

[0040] Figure 10H is a schematic diagram exemplarily showing a wheelchair, in which the front wheel assembly is relative to Figure 10G folds from an intermediate state to a folded state. Detailed implementation manners

[0041] The present invention will be further described below in combination with the detailed implementation manners and the drawings. More details are elaborated in the following description for a full understanding of the present invention. However, the present invention is obviously capable of being implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this detailed implementation manner.

[0042] For example, when the first feature described subsequently in the specification is formed above or on the second feature, it may include an implementation manner in which the first feature and the second feature are formed by a direct connection manner, and may also include an implementation manner in which additional features are formed between the first feature and the second feature, so that the first feature and the second feature may not be directly connected. Further, when the first element is described as being connected or combined with the second element, this description includes an implementation manner in which the first element and the second element are directly connected or combined with each other, and also includes an implementation manner in which one or more other intervening elements are added to indirectly connect or combine the first element and the second element.

[0043] An example structure of the state adjustment device 10 provided by the present invention is as Figure 1 shown. Figure 10A shows the state in which the state adjustment device 10 is applied to the wheelchair 100. The state adjustment device 10 can adjust the state of the backrest assembly 20 relative to the seat cushion assembly 30. That is, the wheelchair 100 may include the state adjustment device 10, and the wheelchair 100 further includes a backrest assembly 20 and a seat cushion assembly 30. Among them, the backrest assembly 20 is rotatably mounted on the seat cushion assembly 30, Figure 1 shows a hinge shaft H0 for hinging the backrest assembly 20 and the seat cushion assembly 30, so that the backrest assembly 20 can rotate relative to the seat cushion assembly 30. That is, the backrest assembly 20 can be unfolded or folded relative to the seat cushion assembly 30 by rotating relative to the seat cushion assembly 30. It can be understood that the state adjustment device 10 and the backrest assembly 20 and the seat cushion assembly 30 it adjusts can also be used in other scenarios, such as vehicle seats, household seats, or office chairs, etc. In the illustrated implementation manner, the seat cushion assembly 30 may be provided with a support 301. In the illustrated implementation manner, the hinge shaft H0 hinges the backrest assembly 20 and the support 301. It should be understood that the drawings are only examples and should not constitute a limitation on the actual protection scope required by the present invention.

[0044] See Figure 1, the state adjustment device 10 includes a mating component 1 and an adjustment component 2. The mating component 1 is provided with a locking groove 3, and the adjustment component 2 is provided with a locking shaft 4.

[0045] Figure 1 In this case, the mating component 1 is mounted to the seat cushion assembly 30. Figure 1 In this case, the mating component 1 is mounted to the seat cushion assembly 30 through the support 301, that is, the mating component 1 is mounted to the support 301, and the support 301 is mounted to the seat cushion assembly 30. The adjustment component 2 is mounted to the backrest assembly 20. It can be understood that in another embodiment, the mating component 1 provided with the locking groove 3 can also be mounted to the backrest assembly 20, and correspondingly, the adjustment component 2 provided with the locking shaft 4 can also be mounted to the seat cushion assembly 30. That is, the mating component 1 provided with the locking groove 3 can be mounted to the first one of the seat cushion assembly 30 and the backrest assembly 20, and the adjustment component 2 provided with the locking shaft 4 can be mounted to the second one of the seat cushion assembly 30 and the backrest assembly 20. In the illustrated embodiment, the aforementioned first one is the seat cushion assembly 30, and the aforementioned second one is the backrest assembly 20.

[0046] The backrest assembly 20 is configured to be rotatable to a first position P1, as can be seen in Figure 10A and Figure 9C , Figure 10A and Figure 9C both show the backrest assembly 20 in the first position P1. It can be combined with Figure 10A and Figure 9C , in the first position P1, the locking shaft 4 is snapped into the locking groove 3, whereby the backrest assembly 20 is in a backrest unfolded state relative to the seat cushion assembly 30. The first position P1 can also be referred to as the backrest position. When the backrest assembly 20 is in the first position P1, the backrest assembly 20 or the wheelchair 100 can be considered to be in the backrest mode. It can be understood that the backrest assembly 20 being in the first position P1 and the folding position P0, the second position P2, etc. described later all refer to the position or state of the backrest assembly 20 relative to the seat cushion assembly 30.

[0047] For the convenience of description, spatial relationship terms such as "upper", "lower", "front", "rear", etc. may be used in the text to describe the relationship between one element or feature shown in the drawings and other elements or features. It can be understood that the directions in the text are all described with reference to the normal use state when the user is back against the backrest assembly 20 and sitting on the seat cushion assembly 30. For example, "side" can be the left or right side of the user at this time, and "upper side", "lower side", etc. are also referenced at this time. Moreover, unless otherwise specified, extending along a specific direction does not require strict compliance with the mathematical definition, but requires that the extending direction has a component in that specific direction. Preferably, the included angle between the extending direction and that specific direction is less than 45°. It should be understood that using spatial relationship terms is intended to include other directions of the elements or components during use or operation, in addition to the directions depicted in the drawings. For example, if the components in the drawings are folded, the direction of the element described as "under" other elements or features will be changed to "above" the said other elements or features.

[0048] In the above state adjustment device 10, the lock shaft 4 and the lock groove 3 are respectively connected to the backrest assembly 20 and the seat cushion assembly 30 connected by a rotating pair. By engaging the lock shaft 4 into the lock groove 3, the backrest assembly 20 can be in a backrest unfolded state relative to the seat cushion assembly 30, and at this time, it is available for the user to lean back. In the wheelchair 100, in the backrest unfolded state, the included angle between the backrest assembly 20 and the seat cushion assembly 30 is preferably 90 - 120°, more preferably 98 - 108°, and is 103° in the illustrated preferred embodiment to improve the user's backrest comfort. The included angle at this time is shown as α1 in Figure 9C and this range value includes the endpoint values at both ends. By rotating the backrest assembly 20 away from the first position P1, such as reaching the intermediate position P11 in Figure 9B , the lock shaft 4 is disengaged from the lock groove 3, and the backrest assembly 20 can be folded relative to the seat cushion assembly 30 under the action of gravity to the folded state shown in Figure 9A . At this time, the backrest assembly 20 can be said to reach the folded position P0. At the intermediate position P11, the backrest assembly 20 tilts forward. In other words, when the lock shaft 4 is disengaged from the lock groove 3, when viewed from the side, the backrest assembly 20 tilts forward relative to the strictly vertical and horizontal directions, that is, the included angle between the backrest assembly 20 and the horizontally extending seat cushion assembly 30 is less than 90°.

[0049] In the illustrated embodiment, the state adjustment device 10 may further include an unlocking assembly 5 for disengaging the lock shaft 4 from the lock groove 3. For example, the unlocking assembly 5 can be a push rod to push the lock shaft 4 away from the lock groove 3. Another example is that the unlocking assembly 5 can be a hook to pull the lock shaft 4 away from the lock groove 3.

[0050] It is understood that specific words are used herein to describe the embodiments of the present invention, such as "one embodiment", "another embodiment", and / or "some embodiments" to refer to a certain feature, structure or characteristic associated with at least one embodiment of the present invention. Therefore, it should be emphasized and noted that "one embodiment" or "another embodiment" mentioned twice or more in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present invention may be appropriately combined. In addition, the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0051] Combination Figures 2 to 4 In the illustrated embodiment, the unlocking assembly 5 may include a trigger rod 51 and a movable member 52. The trigger rod 51 is rotatably mounted to the cushion assembly 30 (as an example of the first party of the aforementioned cushion assembly 30 and the backrest assembly 20). In the figure, the trigger rod 51 is rotatably mounted to the support 301, for example, via a rotating shaft H1, thereby being rotatably mounted to the cushion assembly 30. The movable member 52 is movably supported on the mating component 1, and is pushed by one end of the trigger rod 51 (in the figure, the upper end 512 of the trigger rod 51) as the trigger rod 51 rotates, thereby pushing the lock shaft 4 out of the lock slot 3. See Figure 9B and Figure 9C The trigger lever 51 is rotatably mounted to the seat cushion assembly 30 (eg, via a rotating shaft H1) Figure 9B and Figure 9C ), by pulling upward Figure 9C The trigger end 511 (the lower end in the figure) of the trigger rod 51 rotates around the rotation axis H1, and the upper end 512 of the trigger rod 51 contacts and pushes the movable member 52 to move backward, so that the movable member 52 pushes the lock shaft 4 backward, so that the lock shaft 4 is separated from the lock groove 3, thereby achieving Figure 9B Status. Figure 3 As shown, the trigger end 511 of the trigger rod 51 may be provided with a roller 511 a to facilitate the rear wheel support beam 50 b to be described later to roll and contact the trigger rod 51 .

[0052] The structure of the unlocking assembly 5 allows the lock shaft 4 to be quickly and conveniently pushed out of the lock slot 3 by simply pulling the trigger lever 51, so that the backrest assembly 20 can be separated from the backrest unfolded state, for example, it can be folded under the action of gravity. The unlocking assembly has few parts and can realize the function of unlocking with simple operation. Moreover, when the unlocking assembly 5 is used in the wheelchair 100 shown in the figure, it can be convenient to cooperate with the rear wheel assembly 50 ( Figure 10Ashown) automatically unlocks when folding towards the seat cushion assembly 30, which will be further described later.

[0053] In the illustrated embodiment, the unlocking assembly 5 may further include a second elastic member S2. The elastic force of the second elastic member S2 has a tendency to push the trigger rod 51 to move the movable member 52, that is, the elastic force of the second elastic member S2 has a tendency to disengage the locking shaft 4 from the locking groove 3. Refer to Figure 2 , the second elastic member S2 may be a torsion spring disposed around the rotating shaft H1. One end of the torsion spring abuts against the trigger end 511 of the trigger rod 51, and the other end abuts against the support 301. Therefore, the torsion spring as the second elastic member S2 always has a tendency to push the trigger end 511 of the trigger rod 51, that is, its elastic force has a tendency to push the trigger rod 51 to move the movable member 52. The elastic force of the second elastic member S2 provides a pre-tightening force for the trigger rod 51, so that the movable member 52 is in the Figure 4 position shown in. In another embodiment, the second elastic member S2 may also be a compression spring, for example, disposed between the trigger end 511 of the trigger rod 51 and the support 301, and its elastic force may also have a tendency to push the trigger rod 51 to move the movable member 52.

[0054] In the illustrated embodiment, the mating member 1 provides a chute 11 on each side (left and right in the figure). Refer to Figures 3 to 5 , the mating member 1 may include two flat members 1a, 1b spaced apart (in the left-right direction in the figure). Each flat member (for example, 1a) is provided with a chute 11 on the side opposite to the other flat member (for example, 1b), whereby the mating member 1 provides a chute 11 on each side. The locking groove 3 can be considered to be jointly formed by the notches 3a, 3b provided at the rear ends of the two flat members 1a, 1b respectively and opening towards the rear side. Correspondingly, the support 301 may be provided to include a bottom plate 301a and mounting blocks 301b extending upward from both sides of the bottom plate 301a. The two flat members 1a, 1b constituting the mating member 1 may be respectively fixedly mounted to the opposite faces of the two mounting blocks 301b of the support 301 by screws, for example. The hinge shaft H0 passes through the mounting blocks 301b of the support 301, and the portion of the backrest assembly 20 through which the hinge shaft H0 passes is disposed between the two mounting blocks 301b. The other end of the torsion spring mentioned above as the second elastic member S2 may abut against the bottom plate 301a of the support 301. The support 301 may be mounted to the seat cushion assembly 30 through the bottom plate 301a. This mounting structure can provide sufficient movement space and make the structure more compact.

[0055] The movable member 52 may include two side walls 521 and a bottom wall 522 that form a U shape. The two side walls 521 are respectively in sliding fit with the sliding grooves 11 on both sides of the mating member 1. The bottom wall 522 is pushed by the trigger rod 51 (in the figure, its upper end 512), and the free ends of the two side walls 521 (that is, the end opposite to the end connected to the bottom wall 522, the rear end in the figure) push the locking shaft 4, which can be seen Figures 9A to 9C .

[0056] In the illustrated embodiment, the locking groove 3 may communicate with the sliding grooves 11 on both sides of the mating member 1 at both ends in the groove length direction. The locking groove 3 extends left and right, that is, the groove length direction of the locking groove 3 is the left-right direction. The locking groove 3 communicates with the sliding groove 11 on the left side of the mating member 1 (the sliding groove 11 of the flat plate member 1b that forms the mating member 1) and the sliding groove 11 on the right side of the mating member 1 (the sliding groove 11 of the flat plate member 1a that forms the mating member 1) at the left end (the left end of the left side groove opening 3b that forms the locking groove 3) and the right end (the right end of the right side groove opening 3a that forms the locking groove 3) respectively.

[0057] The free ends of the two side walls 521 are each provided with a protrusion 523 protruding toward each other, and the protrusion 523 is blocked by the groove bottom 31 of the locking groove 3. That is, Figures 3 to 5 in, the rear end of the left side wall 521 is provided with a protrusion 523 protruding to the right, and the rear end of the right side wall 521 is provided with a protrusion 523 protruding to the left. The protrusion 523 hooks the groove bottom 31 of the locking groove 3, that is, it is blocked by the groove bottom 31 of the locking groove 3. In the above structure, the groove bottom 31 of the locking groove 3 blocks the protrusion 523 of the side wall 521, which can limit the forward displacement of the movable member 52, and the mating member 1 blocks the bottom wall 522, which can limit the backward displacement of the movable member 52. The sliding groove 11 can not only guide the movable member 52 to move forward and backward to push the locking shaft 4, but also limit the movable member 52 in the up-down direction. Therefore, the movable member 52 is reliably installed on the mating member 1 and can slide forward and backward a certain distance. Preferably, when the movable member 52 is in the position shown under the elastic force of the second elastic member S2, the protrusion 523 of the side wall 521 of the movable member 52 can block the opening of the locking groove 3, so that the locking shaft 4 needs to overcome the elastic force of the second elastic member S2 to enter the locking groove 3. Figure 4 As shown, when the movable member 52 is in the position shown under the elastic force of the second elastic member S2, the protrusion 523 of the side wall 521 of the movable member 52 can block the opening of the locking groove 3, so that the locking shaft 4 needs to overcome the elastic force of the second elastic member S2 to enter the locking groove 3.

[0058] In the illustrated embodiment, the mating member 1 may provide a smooth rolling surface 12 for guiding the locking shaft 4 to snap into the locking groove 3, which can be seen Figures 9A to 9C . "Smooth rolling surface 12" means that the curvature of each point on the rolling path of the locking shaft 4 on this rolling surface 12 is continuous. As Figure 5 shown, the flat plate members 1a and 1b that form the mating member 1 both have partial sides extending along an arc, thus forming a smooth rolling surface 12. Preferably, the locking shaft 4 is a circular shaft, which is convenient for rolling along the rolling surface 12.

[0059] In the illustrated embodiment, the adjusting assembly 2 may further include a bracket 21. The bracket 21 may be rotatably mounted to the backrest assembly 20 (as an example of the second party in the foregoing seat cushion assembly 30 and backrest assembly 20). The locking shaft 4 is provided at one end 211 of the bracket 21. Refer to Figure 1 . Figure 1 In the figure, the bracket 21 is hinged to the backrest assembly 20 by a hinge shaft H2, for example. The locking shaft 4 is provided at the rear end of the bracket 21 and can move relative to the backrest assembly 20 as the bracket 21 rotates around the hinge shaft H2. This structure facilitates the locking shaft 4 to be inserted into the locking groove 3.

[0060] The state adjusting device 10 may include a locking and holding mechanism for holding the locking shaft 4 in the locking groove 3. For example, the locking and holding mechanism may be a detachable fastener, which can fasten the locking shaft 4 to the mating part 1 after the locking shaft 4 is inserted into the locking groove 3. The fastener may be a screw, a bolt, or a locking pin, tape, rope, hook and loop, etc. In the illustrated embodiment, the locking and holding mechanism is an elastic member, which may be referred to as a first elastic member S1. The elastic force of the first elastic member S1 has a tendency to keep the locking shaft 4 inserted into the locking groove 3.

[0061] In the illustrated embodiment, the first elastic member S1 may be provided between the bracket 21 of the adjusting assembly 2 and the backrest assembly 20 (as an example of the second party in the foregoing seat cushion assembly 30 and backrest assembly 20). For example, refer to Figure 7 , the bracket 21 may have a front wall 213 and two convex arms 214 protruding from both sides of the front wall toward the rear. The front wall 213 and the two convex arms 214 generally form a U-shaped structure. The U-shaped structure of the bracket 21 can accommodate the backrest arm 201 of the backrest assembly 20 from the front side. The hinge shaft H2 passes through the two convex arms 214 of the bracket 21 and the backrest arm 201 accommodated between the two convex arms 214, thereby realizing the rotatable mounting of the bracket 21 to the backrest assembly 20. The first elastic member S1 may be a compression spring and is connected between the front wall 213 of the bracket 21 and the backrest arm 201. Figure 9A The spring groove 201a provided on the backrest arm 201 is also shown in the figure for accommodating the compression spring as the first elastic member S1. The locking shaft 4 is horizontally arranged between the two convex arms 214. As the bracket 21 rotates relative to the hinge shaft H2 in the direction of inserting the locking shaft 4 into the locking groove 3, the compression deformation of the compression spring gradually decreases. Therefore, the elastic force of the compression spring can cause the bracket 21 to rotate in the direction of inserting the locking shaft 4 into the locking groove 3. In Figure 7In this case, the bracket 21 rotates in the direction of moving forward around the lower end 211, and the locking shaft 4 will snap into the locking groove 3. The above structure is simple in construction and more compact in layout. In another embodiment, the first elastic member S1 can also be a tension spring connected between the bracket 21 and the backrest arm 201. This tension spring is arranged such that as the bracket 21 rotates relative to the hinge shaft H2 in the direction of snapping the locking shaft 4 into the locking groove 3, the tensile deformation of this tension spring gradually decreases. In yet another embodiment, the first elastic member S1 can also be a tension spring provided between the locking shaft 4 and, for example, the mating member 1, and always has a tensile elastic force for pulling the locking shaft 4 into the locking groove 3.

[0062] This first elastic member S1 can be part of the adjusting assembly 2, that is, the adjusting assembly 2 can include this first elastic member S1. As described above, in the illustrated embodiment, the elastic force of the second elastic member S2 can cause the protrusion 523 on the side wall 521 of the movable member 52 to block the opening of the locking groove 3 and prevent the locking shaft 4 from entering the locking groove 3. Therefore, the acting force that the first elastic member S1 causes the locking shaft 4 to snap into the locking groove 3 can overcome the acting force of the second elastic member S2 that prevents the locking shaft 4 from entering the locking groove 3. For example, it can be made such that the elastic force of the first elastic member S1 is greater than the elastic force of the second elastic member S2. The backrest assembly 20 can be manually rotated to (or, close to) the first position P1. Under the action of the elastic force of the first elastic member S1, the locking shaft 4 can push the movable member 52 from Figure 4 the position to Figure 3 the position. At the same time, the locking shaft 4 can also enter the locking groove 3, realizing the opening or unfolding of the backrest assembly 20 and fixing it.

[0063] In the illustrated embodiment, the mating member 1 also has a bayonet 6. The backrest assembly 20 is arranged to be rotatable via the first position P1 to the second position P2, that is, from Figure 9C the state position to Figure 9D the state position. As Figure 9D shown, at the second position P2, the locking shaft 4 snaps into the bayonet 6. Thereby, the backrest assembly 20 is in a fully unfolded state relative to the seat cushion assembly 30. In the wheelchair 100, in the fully unfolded state, the included angle between the backrest assembly 20 and the seat cushion assembly 30 is preferably 180 - 220°, more preferably 188 - 198°, and is 193° in the illustrated preferred embodiment. The included angle at this time is shown as α2 in Figure 9D In this way, for the illustrated wheelchair 100, near the end of the seat assembly 30 opposite to the end where it is hinged to the backrest assembly 20 ( Figure 8 in this case, the lower end), a roller 309 is provided. In this fully unfolded state, the backrest assembly 20 can be used as a handle or grip similar to a suitcase handle, and the seat cushion assembly 30 can be used as a box similar to a suitcase, thus forming Figure 8In the trunk mode, the entire wheelchair 100 can be towed. In the illustrated embodiment, the bayonet 6 is a mating component that fits into the open notches on both sides of the component 1. In the figure, the notches that are open on both the front side and the lower side are provided below the mating component 1. Such a notch structure allows the user to easily operate to disengage the locking shaft 4 from the bayonet 6. It can be understood that the bayonet 6 can also be a slot that is open on one side, as long as it can limit the locking shaft 4. The second position P2 can also be referred to as the handle position. In the figure, the rotation directions of the backrest assembly 20 from the backrest position to the handle position and from the backrest position to the folding position are opposite.

[0064] In the illustrated embodiment, similar to the rolling surface 12, the mating component 1 can also provide a smooth rolling surface 12a for guiding the locking shaft 4 to engage with the bayonet 6. Refer to Figures 9A to 9D . The arc extended by the rolling surface 12a can be consistent with the arc extended by the rolling surface 12.

[0065] As Figure 1 shown, the backrest assembly 20 can have backrest arms 201 on both sides respectively, and also have a cross arm 202 connecting the two backrest arms 201. For each backrest assembly 20, a state adjustment device 10 can be respectively provided. In the illustrated embodiment, an unlocking rod 24 is connected between the ends 212 ( Figure 1 shown in the figure) of the brackets 21 of the two state adjustment devices 10 that are opposite to the locking shaft 4. By manually operating the unlocking rod 24, the bracket 21 can be rotated so that the locking shaft 4 disengages from the locking groove 3, thereby realizing the unlocking of the backrest unfolded state or the fully unfolded state.

[0066] In the illustrated embodiment, the wheelchair 100 further includes a front wheel assembly 40 and a rear wheel assembly 50. Among them, both the front wheel assembly 40 and the rear wheel assembly 50 can be folded relative to the seat cushion assembly 30. For example, they are installed below the seat cushion assembly 30 in a hinged manner. For example, Figure 10A in the figure, the front wheel assembly 40 with its upper end 401 hinged below the seat cushion assembly 30 can be folded relative to the seat cushion assembly 30 by the pulling of the connecting rod 400. The front end 400a of the connecting rod 400 can be hinged to the front wheel assembly 40, and the rear end 400b of the connecting rod 400 can be connected to a slider that can move back and forth relative to the seat cushion assembly 30. This slider can be driven to slide by an electric motor and electronic control, for example. The rear wheel assembly 50 with its upper end 501 hinged below the seat cushion assembly 30 can be folded relative to the seat cushion assembly 30 by the pulling of the connecting rod 500. The rear end 500b of the connecting rod 500 can be hinged to the rear wheel assembly 50, and the front end 500a of the connecting rod 500 can be connected to a slider that can move back and forth relative to the seat cushion assembly 30. This slider can be driven to slide by an electric motor and electronic control, for example.

[0067] Figure 8In this case, the rollers 309 provided near the lower end of the seat assembly 30 can be provided on the front wheel assembly 40. When the front wheel assembly 40 is folded to be close to the seat cushion assembly 30, the rollers 309 are displaced to near the lower end of the seat cushion assembly 30.

[0068] Reference can be made to Figures 10A to 10E , where G0 represents the ground. The front wheel assembly 40 can be changed from Figure 10A the upright state to Figure 10B the folded state. From Figure 10B this state, the rear wheel assembly 50 can gradually change to Figure 10C and Figure 10D the folded state through Figure 10E states. Figure 10E In this case, a part of the rear wheel 50a of the rear wheel assembly 50 is received in the storage box, and the rear wheel support beam 50b of the rear wheel assembly 50 automatically toggles the trigger end 511 of the trigger lever 51 of the state adjustment device 10 during this transformation process. As shown at the position AP in Figure 10E , the rear wheel support beam 50b contacts the trigger end 511 of the trigger lever 51. As described above, the trigger end 511 of the trigger lever 51 can be provided with a roller 511a, and the rear wheel support beam 50b can rollingly contact the trigger lever 51.

[0069] This automatic toggling can unlock the backrest unfolding state caused by the locking shaft 4 being inserted into the locking groove 3 by the unlocking assembly 5. As a result, the backrest assembly 20 disengages from the backrest unfolding state and reaches the folded state under the action of gravity, as shown in Figures 10E to 10G and as shown in Figure 10G . That is, during the folding process of the wheelchair 100, the seat cushion assembly 30 of the wheelchair 100 is approximately in a vertical position. The trigger end 511 of the trigger lever 51 contacts the rear wheel support beam 50b of the wheelchair 100, thereby pushing the movable part 52 in contact with the trigger lever 51. The movable part 52 pushes out the locking shaft 4 in the locking groove 3, and the unlocked backrest assembly 20 will automatically fold under the action of gravity.

[0070] From Figures 10G to 10H it is also shown that at this time the front wheel assembly 40 continues to fold. Finally, the wheelchair 100 reaches the fully folded state and is folded into a substantially box structure with a minimized volume, as shown in Figure 10H . Therefore, the above state adjustment device 10 can realize the automation of the folding of the backrest assembly 20 while the frame structure of the wheelchair 100 is folded, overcoming the problem that the backrest assembly 20 is difficult to be linked with other components for synchronous operation without relying on any other structure, and can interact with the rear wheel assembly 50, especially its rear wheel support beam 50b.

[0071] As described above, the mating part 1 also has a bayonet 6. The user can start from Figure 10HThe state will rotate from the first position P1 to the second position P2 via the backrest component 20, and then it can reach Figure 8 the trunk state shown. Among them, the backrest component 20 is in a fully unfolded state. The backrest component 20 can act as a trunk pull rod, while the folding body composed of the seat cushion component 30, the front wheel component 40 and the rear wheel component 50 can act as the trunk body. Therefore, it is convenient for users to drag the entire wheelchair 100. If the seat cushion component 30 is still placed horizontally as in the use state, the height of the folding body composed of the seat cushion component 30, the front wheel component 40 and the rear wheel component 50 is too low. If the seat cushion component 30 is placed vertically, as Figure 8 shown, that is, the backrest component 20 is folded to act as a handle. At this time, the height of the folding body is relatively high. Therefore, when carrying the wheelchair 100, the backrest component 20, especially its cross arm 202, can be used as the handle for dragging the trunk. At this time, the backrest component 20 or the wheelchair 100 can be considered to be in the trunk mode.

[0072] The above state adjustment device 10 can make the wheelchair 100 equipped with a multi-mode folding backrest component 20, which can cooperate with the frame structure of the automatically folding wheelchair. For example, for a wheelchair that uses the method of shifting the center of gravity for automatic folding, the backrest component 20 can be folded synchronously when the wheelchair 100 is folded. The backrest component 20 can respectively realize three states: backrest folding, backrest opening, and acting as a handle for moving the trunk. Among them, the states of backrest opening and acting as a handle for moving the trunk can fix the position of the backrest component 20 through a lock, for example.

[0073] Taking the automatically foldable wheelchair 100 as an example, after the frame structure of the wheelchair 100 is automatically unfolded, the lock groove 3 can be in an open state. The user can manually open the backrest component 20. After the lock shaft 4 enters the lock groove 3, the backrest component 20 can be fixed in the backrest position, that is, the first position P1. At this time, if it is necessary to fold the backrest component 20, the trigger rod 51 of the unlocking component 5 needs to be pressed. When the frame structure of the wheelchair 100 is automatically folded, the lock shaft 4 will be pushed out of the lock groove 3 by the trigger rod 51 pushed by the rear wheel component 50 through the movable part 52. At this time, the backrest component 20 folds down to the folded position P0 under its own gravity, and can cooperate to realize the overall automatic folding of the wheelchair 100.

[0074] In the open state of the wheelchair 100, before folding, first fold the backrest component 20 to the handle position in the trunk mode, and then it can enter the trunk mode after automatic folding. In the folded state of the wheelchair 100, if the trunk mode is required during handling, the backrest component 20 needs to be opened and folded. During the folding process, the above state adjustment device 10 is in Figure 9AIn the folded state, the trigger lever 51 pushed by the rear wheel assembly 50 blocks the lock slot 3 in the backrest position, and during the folding process, it can skip the backrest position and directly fold to the handle position, thus entering the trunk mode.

[0075] The unlocking component 5 of the above-mentioned state adjusting device 10 enables the backrest component 20 to skip the backrest position in the folded state. Therefore, if it is necessary to enter the trunk mode after folding, the backrest component 20 in the folded state can also be directly folded to the handle position in the trunk mode and skip the backrest position. Similarly, if it is necessary to fold the backrest component 20 in the trunk mode, it can also directly enter the folded position and skip the backrest position. Thus, the process and time of user unlocking can be reduced.

[0076] Generally speaking, the above-mentioned state adjusting device enables the backrest component to have three locked positions, namely the folded position, the backrest position, and the handle position. When the wheelchair shown in the figure is folded, it can skip the backrest position and directly switch between the folded position and the handle position. It can enter the backrest mode only when the wheelchair is unfolded. This state adjusting device can make the folding of the backrest component "intelligent", simplify the operation, and improve the efficiency.

[0077] Although the present invention is disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A state adjustment device for adjusting the state of a backrest assembly relative to a seat cushion assembly, wherein the backrest assembly is rotatably mounted on the seat cushion assembly, characterized in that, The state adjustment device includes: A mating component, installed on a first one of the seat cushion assembly and the backrest assembly, the mating component being provided with a locking groove; and An adjustment component, installed on a second one of the seat cushion assembly and the backrest assembly, the adjustment component being provided with a locking shaft; The backrest assembly is configured to be rotatable to a first position, in which the locking shaft is snapped into the locking groove, whereby the backrest assembly is in a backrest unfolded state relative to the seat cushion assembly; The state adjustment device further includes an unlocking component, the unlocking component including: A trigger rod, rotatably installed on the first side; and A movable member, movably supported by the mating component and pushed by one end of the trigger rod as the trigger rod rotates, whereby the locking shaft is pushed out of the locking groove; The mating component provides a chute on each of the two sides; The movable member includes two side walls and a bottom wall forming a U shape, the two side walls are respectively in sliding fit with the chutes on the two sides of the mating component, the bottom wall is pushed by the trigger rod, and the free ends of the two side walls push the locking shaft; The two ends of the locking groove in the groove length direction are respectively communicated with the chutes on the two sides of the mating component; The free ends of the two side walls are each provided with a protrusion protruding towards each other, and the protrusion is blocked by the bottom of the locking groove; 2. The state adjustment device according to claim 1, characterized in that The unlocking component further includes a second elastic member, and the elastic force of the second elastic member has a tendency to make the trigger rod push the movable member; 3. The state adjustment device according to claim 1, characterized in that The adjustment component further includes: A bracket, rotatably installed on the second side, the locking shaft being provided at one end of the bracket; and A first elastic member, provided between the bracket and the second side, and the elastic force of the first elastic member has a tendency to keep the locking shaft snapped into the locking groove; 4. The state adjustment device according to claim 1, characterized in that The first side is the seat cushion assembly; 5. The state adjustment device according to any one of claims 1 to 4, characterized in that The mating component further has a bayonet; The backrest assembly is configured to be rotatable from the first position to a second position, in which the locking shaft is snapped into the bayonet, whereby the backrest assembly is in a fully unfolded state relative to the seat cushion assembly; 6. A wheelchair, characterized in that, Including the state adjustment device according to any one of claims 1 to 5; 7. The wheelchair according to claim 6, wherein, The wheelchair includes a backrest assembly and a seat cushion assembly; In the backrest unfolded state, the included angle between the backrest assembly and the seat cushion assembly is 98 - 108°; and / or In the fully unfolded state, the included angle between the backrest assembly and the seat cushion assembly is 188 - 198°.

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