CN115429560A - State adjusting device and wheelchair - Google Patents

Abstract

The invention provides a state adjusting device, which is used for adjusting the state of a backrest assembly relative to a cushion assembly, wherein the backrest assembly is rotatably arranged on the cushion assembly, the state adjusting device comprises a matching part and an adjusting assembly, the matching part is arranged on a first side of the cushion assembly and the backrest assembly, the matching part is provided with a locking groove, the adjusting assembly is arranged on a second side of the cushion assembly and the backrest assembly, the adjusting assembly is provided with a locking shaft, the backrest assembly is arranged to rotate to a first position, and the locking shaft is clamped into the locking groove in the first position, so that the backrest assembly is in a backrest unfolding state relative to the cushion assembly. The invention also provides a wheelchair comprising the state adjusting device. The state adjusting device can independently and conveniently adjust the state of the backrest assembly relative to the seat cushion assembly.

Description

State adjusting device and wheelchair

Technical Field

The present invention relates to a wheelchair, and more particularly, to a posture adjustment device that can adjust the posture of a backrest assembly with respect to a seat cushion assembly.

Background

At present, the folding wheelchairs in the market are folded in two ways. The first is that the two side frames of the wheelchair fold inwardly, and the back portion or back assembly and the left and right frames of the wheelchair folded in this manner are secured together, respectively, and cannot be folded individually. The second is to fold by adopting a plurality of groups of connecting rod mechanisms, the backrest assembly is a part of the connecting rod mechanism, and the backrest assembly is also folded when the wheelchair is folded. The folding wheelchairs of the two solutions have almost reached the limit after years of development, but are still bulky. The inventor finds that in the prior art, no matter which folding mode is adopted, the folded position of the folding wheelchair back assembly is fixed along with other structures of the wheelchair and cannot be independently unfolded. The inventor believes that if the backrest assembly of a folding wheelchair can be deployed alone, the structural or posture adjustment of the entire wheelchair is more flexible and can provide even more modes of operation.

Therefore, it is desirable to provide a state adjustment device that can independently and conveniently adjust the state of the back rest assembly relative to the seat cushion assembly.

Disclosure of Invention

The invention aims to provide a state adjusting device which can independently and conveniently adjust the state of a backrest assembly relative to a seat cushion assembly.

The invention provides a state adjusting device for adjusting the state of a backrest assembly relative to a seat cushion assembly, wherein the backrest assembly is rotatably arranged on the seat cushion assembly. State adjusting device includes cooperation part and adjusting part, cooperation part install extremely the cushion subassembly with lean against the first party in the subassembly, cooperation part is provided with the locked groove, adjusting part installs extremely the cushion subassembly with lean against the second side in the subassembly, adjusting part is provided with the lock axle, it is rotatable to the first position to set back the subassembly, first position, lock axle card is gone into in the locked groove, borrow this, lean against the subassembly for the cushion subassembly is in and leans against the expansion state.

In one embodiment, the condition adjustment device further comprises an unlocking assembly for disengaging the lock shaft from the lock slot.

In one embodiment, the unlocking assembly includes a trigger lever rotatably mounted to the first side and a movable member movably supported to the mating member and pushed by one end of the trigger lever as the trigger lever rotates, thereby pushing the lock shaft out of the locking groove.

In one embodiment, the unlocking assembly further comprises a second elastic member, and the elastic force of the second elastic member has a tendency to cause the trigger lever to push the movable member.

In one embodiment, the mating part is provided with a runner on each side; the movable part comprises two side walls and a bottom wall which form a U shape, the two side walls are respectively in sliding fit with the sliding grooves on two sides of the matching part, the bottom wall is pushed by the trigger rod, and the free ends of the two side walls push the lock shaft.

In one embodiment, both ends of the locking groove in the groove length direction are respectively communicated with the sliding grooves on both sides of the matching component; the free ends of the two side walls are each provided with a projection projecting towards each other, which is stopped by the groove bottom of the locking groove.

In one embodiment, the mating member provides a smooth rolling surface for guiding the latch spindle to snap into the latch slot.

In one embodiment, the adjustment assembly further comprises a bracket rotatably mounted to the second side, the lock shaft is disposed at one end of the bracket, and a first elastic member disposed between the bracket and the second side, the elastic force of the first elastic member having a tendency to keep the lock shaft snapped into the lock groove.

In one embodiment, the first party is the seat cushion assembly.

In one embodiment, the mating part further has a bayonet; the backrest assembly is configured to be rotatable from the first position to a second position in which the latch shaft is snapped into the bayonet, whereby the backrest assembly is in a fully deployed state relative to the seat cushion assembly.

The invention also provides a wheelchair comprising the state adjusting device.

In one embodiment, the wheelchair includes a backrest assembly and a seat cushion assembly; in a back unfolding state, an included angle between the back assembly and the seat cushion assembly is 98-108 degrees; and/or, in a fully unfolded state, the included angle between the backrest assembly and the cushion assembly is 188-198 degrees.

Among the above-mentioned state adjusting device, cooperation part and regulating assembly install respectively to cushion subassembly and back subassembly, go into the locked groove through the lock axle card and can make the back subassembly be in the expansion state of backing a back, break away from the locked groove through the lock axle and can make the subassembly of backing a back reach fold condition under the action of gravity for example. The backrest assembly can be unfolded independently, is convenient to operate, and can be adjusted independently and conveniently relative to the seat cushion assembly.

The above state adjustment device further comprises an unlocking assembly. The unlocking assembly comprises a trigger rod and a moving part, the moving part can be pushed through the trigger rod by rotating the trigger rod, and then the lock shaft is pushed away from the lock groove through the moving part. The user only needs to pull the trigger lever manually, and the comfort level of operation can be improved. And when the folding device is applied to other structures, particularly wheelchairs with foldable rear wheel assemblies, the folding device can be synchronously operated with the folding linkage of the rear wheel assemblies, and the integral automatic folding is conveniently realized.

Among the above-mentioned state adjusting device, the cooperation part is further provided with the bayonet socket, crosses the locked groove and blocks into the bayonet socket through the lock axle, can be so that to lean on the subassembly to be in the state of unfolding completely, and the subassembly of leaning on can act as the handle this moment, drags as the box of suitcase with other parts of wheelchair, is applied to especially can provide the wheelchair of gyro wheel in the below this moment, and the user of being convenient for especially uses.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a schematic view exemplarily showing a state adjustment device engaged with a backrest assembly.

Fig. 2 is a schematic view exemplarily showing the bottom of the state adjustment device.

Fig. 3 is a schematic diagram exemplarily illustrating an unlocking assembly.

FIG. 4 is another schematic view illustrating an unlocking assembly, wherein the movable member is positioned differently from that of FIG. 3.

Fig. 5 is a schematic diagram illustrating the mating of the unlocking assembly with the mating member.

Fig. 6 is a schematic view exemplarily showing a mating member.

Fig. 7 is another schematic view exemplarily illustrating the state adjustment assembly engaged with the backrest assembly.

FIG. 8 is a schematic view exemplarily illustrating the wheelchair in a luggage mode.

Fig. 9A is a schematic view exemplarily illustrating the state adjustment device when the backrest assembly is in the folded position.

Fig. 9B is a schematic view exemplarily illustrating the state adjustment device when the back rest assembly is in an intermediate position between the folded position and the back rest position.

Fig. 9C is a schematic view exemplarily illustrating the state adjustment device when the backrest assembly is in the backrest position.

Fig. 9D is a schematic view exemplarily illustrating the state adjustment device when the backrest assembly is in the handle position.

Figure 10A is a schematic diagram illustrating an exemplary wheelchair with the backrest assembly in a backrest deployed state and with both the front and rear wheel assemblies in a deployed state.

Figure 10B is a schematic view illustrating a wheelchair in which the front wheel assembly is folded from an unfolded state to an intermediate state relative to figure 10A so that the front surface of the front wheel assembly can support the entire wheelchair.

Figure 10C is a schematic view illustrating the wheelchair with the rear wheel assembly folded from the unfolded state to an intermediate state relative to figure 10B.

Figure 10D is a schematic view illustrating the wheelchair with the rear wheel assembly further folded from this intermediate condition to another intermediate condition relative to figure 10C.

Figure 10E is a schematic view illustrating the wheelchair with the rear wheel assembly further folded from the another intermediate condition to a folded condition relative to figure 10D.

Figure 10F is a schematic view illustrating the wheelchair with the backrest assembly folded from the backrest unfolded state to an intermediate state relative to figure 10E.

Figure 10G is a schematic view illustrating the wheelchair with the backrest assembly folded from the intermediate condition to the folded condition relative to figure 10F.

Figure 10H is a schematic view illustrating the wheelchair with the front wheel assembly folded from the neutral condition to the folded condition relative to figure 10G.

Detailed Description

The present invention will be further described with reference to the following detailed description and the accompanying drawings, wherein the following description sets forth further details for the purpose of providing a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms other than those described herein, and it will be readily apparent to those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or scope of the invention.

For example, a first feature described later in the specification may be formed over or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

An example configuration of a state adjustment device 10 provided by the present invention is shown in fig. 1. Fig. 10A shows a state in which the state adjustment device 10 is applied to the wheelchair 100, and the state adjustment device 10 can adjust the state of the back rest assembly 20 with respect to the seat cushion assembly 30. That is, the wheelchair 100 may include the condition adjusting device 10, the wheelchair 100 further including a backrest assembly 20 and a seat cushion assembly 30. Wherein the backrest module 20 is rotatably mounted to the seat cushion module 30, fig. 1 shows a hinge shaft H0 for hinging the backrest module 20 and the seat cushion module 30 so that the backrest module 20 can rotate relative to the seat cushion module 30. That is, the seatback assembly 20 may be unfolded or folded relative to the cushion assembly 30 by rotating relative to the cushion assembly 30. It will be appreciated that the condition adjustment device 10 and its adjusted backrest and seat assemblies 20, 30 may also be used in other settings, such as in a car seat, home seat, or office chair. In the illustrated embodiment, the seat cushion assembly 30 may be provided with a seat 301. In the illustrated embodiment, the hinge shaft H0 hinges the backrest module 20 and the support 301. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims.

Referring to fig. 1, a condition adjustment device 10 includes a fitting member 1 and an adjustment assembly 2. The fitting part 1 is provided with a locking groove 3, and the adjusting assembly 2 is provided with a locking shaft 4.

In fig. 1, the engaging member 1 is mounted to the seat cushion assembly 30. In fig. 1, the engaging member 1 is mounted to the seat cushion assembly 30 through a bracket 301, that is, the engaging member 1 is mounted to the bracket 301, and the bracket 301 is mounted to the seat cushion assembly 30. The adjusting assembly 2 is mounted to the backrest assembly 20. It is understood that in another embodiment, the engaging member 1 provided with the locking groove 3 may also be mounted to the back assembly 20, and correspondingly, the adjusting assembly 2 provided with the locking shaft 4 may also be mounted to the seat cushion assembly 30. That is, the fitting member 1 provided with the lock groove 3 may be mounted to a first one of the seat cushion assembly 30 and the back rest assembly 20, and the adjusting assembly 2 provided with the lock shaft 4 may be mounted to a second one of the seat cushion assembly 30 and the back rest assembly 20. In the illustrated embodiment, the first side is the seat cushion unit 30, and the second side is the seatback unit 20.

The backrest assembly 20 is configured to be rotated to a first position P1, as can be seen in fig. 10A and 9C, each of fig. 10A and 9C showing the backrest assembly 20 in the first position P1. As can be seen from fig. 10A and 9C, in the first position P1, the latch shaft 4 is engaged in the latch groove 3, whereby the backrest module 20 is in a backrest unfolded state relative to the seat cushion module 30. The first position P1 can also be referred to as a back rest position, and when the back rest assembly 20 is in the first position P1, the back rest assembly 20 or the wheelchair 100 can be considered to be in a back rest mode. It is understood that the first position P1 of the backrest assembly 20 and the folding position P0, the second position P2, etc. which will be described later all mean the position or state of the backrest assembly 20 relative to the seat cushion assembly 30.

For convenience in description, spatial relational terms such as "upper", "lower", "front", "rear", and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the directions are described with reference to the normal use of a user resting on the back rest assembly 20 and sitting on the seat cushion assembly 30, for example, the "side" may be the left or right side of the user at that time, and the "upper side", "lower side" and the like are also used as references, and that the extension in a particular direction is not required to follow a strict mathematical definition unless otherwise stated, but is required to have a component in that particular direction, preferably, the angle between the extension and that particular direction is less than 45 °. It will be understood that the use of spatial relationship terms is intended to encompass other orientations of the element or component in use or operation in addition to the orientation depicted in the figures. For example, if the components in the figures are turned over, elements described as "below" other elements or features would instead be oriented "above" the other elements or features.

In the state adjusting 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 which are connected through the revolute pair, and the lock shaft 4 is clamped into the lock groove 3, so that the backrest assembly 20 is in a backrest unfolding state relative to the seat cushion assembly 30, and a user can lean against the backrest. In the wheelchair 100, in the back-rest unfolded state, the angle between the back-rest assembly 20 and the seat cushion assembly 30 is preferably 90-120 °, more preferably 98-108 °, and in the illustrated preferred embodiment is 103 ° to improve the back-rest comfort of the user. The angle at this time is shown as α 1 in fig. 9C. The range value includes both endpoints. By rotating the backrest assembly 20 away from the first position P1, such as to the intermediate position P11 in fig. 9B, such that the lock shaft 4 is disengaged from the lock slot 3, the backrest assembly 20 can be folded under the action of gravity relative to the seat cushion assembly 30 to the folded position shown in fig. 9A, at which time the backrest assembly 20 can be said to reach the folded position P0. In the neutral position P11, when the backrest module 20 is tilted forward, in other words, when the lock shaft 4 is disengaged from the lock groove 3, the backrest module 20 is tilted toward the front side with respect to the strict up-down direction, that is, the angle between the backrest module 20 and the horizontally extending seat cushion module 30 is less than 90 °.

In the illustrated embodiment, the condition adjusting device 10 may further include an unlocking assembly 5 for disengaging the lock shaft 4 from the lock slot 3. For example, the unlocking member 5 may be a push rod that pushes the lock shaft 4 away from the lock groove 3. For another example, the unlocking member 5 may be a hook to pull the lock shaft 4 away from the lock slot 3.

It is understood that specific terms are used herein to describe embodiments of the invention, such as "one embodiment," "another embodiment," and/or "some embodiments" mean a particular feature, structure, or characteristic described in connection with at least one embodiment of the invention. Therefore, it is emphasized and should be appreciated that two or more references to "one embodiment" or "another embodiment" in various places throughout this specification are not necessarily to the same embodiment. Furthermore, some of the features, structures, or characteristics of one or more embodiments of the present invention may be combined as suitable. In addition, the terms "first", "second", and the like are used to define the components, and are used only for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

Referring to fig. 2 to 4, in the illustrated embodiment, the unlocking assembly 5 may include a trigger lever 51 and a movable member 52. The trigger lever 51 is rotatably mounted to the cushion assembly 30 (as an example of the first one of the aforementioned cushion assembly 30 and backrest assembly 20). In the drawing, the trigger lever 51 is rotatably mounted to the bracket 301, for example, by a rotating shaft H1, thereby being rotatably mounted to the seat cushion assembly 30. The movable member 52 is movably supported by the mating member 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 to be separated from the lock groove 3. Referring to fig. 9B and 9C, the trigger rod 51 is rotatably mounted to the seat cushion assembly 30 (not shown in fig. 9B and 9C) through a rotating shaft H1, for example, by pulling up an trigger end 511 (lower end in the drawing) of the trigger rod 51 in fig. 9C, the trigger rod 51 rotates around the rotating shaft H1, and accordingly, an upper end 512 of the trigger rod 51 contacts the pushing movable piece 52 to move backward, and thus the movable piece 52 pushes the lock shaft 4 backward, so that the lock shaft 4 is disengaged from the lock groove 3, thereby achieving the state of fig. 9B. As shown in fig. 3, the trigger end 511 of the trigger lever 51 may be provided with a roller 511a to facilitate rolling contact of a rear wheel beam 50b, which will be described later, with the trigger lever 51.

The structure of the unlocking assembly 5 enables the lock shaft 4 to be quickly and conveniently pushed out of the lock slot 3 by merely pulling the trigger lever 51, so that the backrest assembly 20 is separated from the backrest unfolding state, for example, the backrest can reach the folding state under the action of gravity. The unlocking assembly has few parts, and the function of unlocking by simple operation can be realized. Moreover, the unlocking assembly 5, when used in the illustrated wheelchair 100, facilitates automatic unlocking in conjunction with the folding of the rear wheel assembly 50 (shown in figure 10A) of the wheelchair 100 toward the seat cushion assembly 30, as will be further described below.

In the illustrated embodiment, the unlocking assembly 5 may further include a second elastic member S2, and the elastic force of the second elastic member S2 has a tendency to make the trigger lever 51 push the movable member 52, that is, the elastic force of the second elastic member S2 has a tendency to make the locking shaft 4 disengage from the locking groove 3. Referring to fig. 2, the second elastic member S2 may be a torsion spring disposed around the rotation shaft H1, one end of the torsion spring abuts against the triggering end 511 of the triggering lever 51, and the other end abuts against the support 301, so that the torsion spring as the second elastic member S2 always has a tendency to push the triggering end 511 of the triggering lever 51, that is, the elastic force thereof has a tendency to make the triggering lever 51 push the movable member 52. The elastic force of the second elastic element S2 provides a preload force to the trigger lever 51, so that the movable element 52 is in the position shown in fig. 4 under the preload force. In another embodiment, the second elastic element S2 may also be a compression spring, for example, and is disposed between the triggering end 511 of the triggering lever 51 and the support 301, and the elastic force thereof may also have a tendency to make the triggering lever 51 push the movable element 52.

In the illustrated embodiment, the engaging member 1 is provided with a slide groove 11 on each of both sides (left and right sides in the drawing). Referring to fig. 3 to 5, the engaging member 1 may include two plate members 1a, 1b arranged at a distance (in the left-right direction in the drawing), each plate member (e.g., 1 a) being provided with a slide groove 11 on a side opposite to the other plate member (e.g., 1 b), whereby the engaging member 1 is provided with a slide groove 11 on both sides. The locking groove 3 can be considered to be formed by two plate members 1a, 1b, each having a rear- side opening 3a, 3 b. Accordingly, the bracket 301 may be configured to include a bottom plate 301a and mounting blocks 301b extending upward from both sides of the bottom plate 301a, and the two flat plate members 1a, 1b constituting the fitting part 1 may be fixedly mounted to opposite faces of the two mounting blocks 301b of the bracket 301, respectively, for example, by screws, with the hinge shaft H0 passing through the mounting blocks 301b of the bracket 301, and a portion of the backrest assembly 20 through which the hinge shaft H0 passes being disposed between the two mounting blocks 301 b. The other end of the torsion spring mentioned above as the second elastic member S2 may abut against the bottom plate 301a of the holder 301. The bracket 301 may be mounted to the seat cushion assembly 30 through a bottom plate 301a. The mounting structure can provide enough moving space and make the structure more compact.

Hinge 52 may include two side walls 521 and a bottom wall 522 forming a U-shape. The two side walls 521 are slidably engaged with the slide grooves 11 of the engaging member 1 on both sides, respectively. While the bottom wall 522 is pushed by the trigger lever 51 (in the figure, the upper end 512 thereof), the free ends of the two side walls 521 (i.e., the ends opposite to the end to which the bottom wall 522 is connected, in the figure, the rear ends) push the lock shaft 4, as can be seen in fig. 9A to 9C.

In the illustrated embodiment, the lock groove 3 may communicate with the slide grooves 11 on both sides of the engaging member 1 at both ends in the groove length direction. The lock groove 3 extends in the left-right direction, that is, the groove length direction of the lock groove 3 is the left-right direction. The lock groove 3 communicates at the left end (left end of the left notch 3b constituting the lock groove 3) and at the right end (right end of the right notch 3a constituting the lock groove 3) with the slide groove 11 on the left side of the engaging member 1 (slide groove 11 of the plate member 1b constituting the engaging member 1) and the slide groove 11 on the right side (slide groove 11 of the plate member 1a constituting the engaging member 1), respectively.

The free ends of the two side walls 521 are each provided with a projection 523 projecting towards each other, the projection 523 being stopped by the groove bottom 31 of the locking groove 3. That is, in fig. 3 to 5, the rear end of the left side wall 521 is provided with a protrusion 523 protruding rightward, and the rear end of the right side wall 521 is provided with a protrusion 523 protruding leftward, and the protrusion 523 hooks the groove bottom 31 of the locking groove 3, that is, is stopped by the groove bottom 31 of the locking groove 3. In the above structure, the groove bottom 31 of the locking groove 3 stops the protrusion 523 of the side wall 521 to limit the forward displacement of the movable element 52, the mating member 1 stops the bottom wall 522 to limit the backward displacement of the movable element 52, and the sliding groove 11 not only can guide the movable element 52 to move forward and backward to push the locking shaft 4, but also can limit the movable element 52 in the up-and-down direction, so that the movable element 52 is reliably mounted on the mating member 1 and can slide forward and backward for a certain distance. Preferably, when the movable member 52 is located at the position shown in fig. 4 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 can enter the locking groove 3 by overcoming the elastic force of the second elastic member S2.

In the illustrated embodiment, the mating part 1 may provide a smooth rolling surface 12 for guiding the locking shaft 4 to snap into the locking groove 3, as can be seen in fig. 9A to 9C. By "smooth rolling surface 12" is meant that the rolling surface 12 has a continuous curvature at every point along the rolling path of the lock shaft 4. As shown in fig. 5, the plate members 1a, 1b constituting the mating member 1 each have a portion of their side surface extending along an arc, thereby constituting a smooth rolling surface 12. Preferably, the lock shaft 4 is a circular shaft, facilitating rolling along the rolling surface 12.

In the illustrated embodiment, the adjustment assembly 2 may further include a bracket 21. The bracket 21 may be rotatably mounted to the back rest assembly 20 (as an example of the second one of the cushion assembly 30 and the back rest assembly 20 described above). And the latch shaft 4 is disposed at one end 211 of the bracket 21, as can be seen in fig. 1. In fig. 1, the bracket 21 is hinged to the backrest module 20 by a hinge shaft H2, for example, and the latch shaft 4 is provided at a rear end of the bracket 21 to be movable relative to the backrest module 20 as the bracket 21 rotates about the hinge shaft H2. This configuration facilitates the snapping of the lock shaft 4 into the lock groove 3.

The condition adjustment device 10 may include a lock retention mechanism for retaining the latch shaft 4 snapped into the latch slot 3. For example, the lock retaining mechanism may be a removable fastener that may, for example, fasten the lock shaft 4 to the mating component 1 after the lock shaft 4 snaps into the lock slot 3. The fasteners may be, for example, screws, bolts, or alternatively, locking pins, tape, cord, staples, and the like. In the illustrated embodiment, the lock holding mechanism is an elastic member, which may be referred to as a first elastic member S1, and the elastic force of the first elastic member S1 has a tendency to keep the lock shaft 4 caught in the lock groove 3.

In the illustrated embodiment, the first elastic member S1 may be disposed between the bracket 21 of the adjustment assembly 2 and the backrest assembly 20 (as an example of the second one of the aforementioned seat cushion assembly 30 and backrest assembly 20). For example, referring to fig. 7, the bracket 21 may have a front wall 213 and two projecting arms 214 projecting from both sides of the front wall toward the rear side, respectively, the front wall 213 and the two projecting arms 214 constituting a substantially U-shaped structure. The U-shaped structure of the bracket 21 can accommodate the backrest arms 201 of the backrest assembly 20 from the front side, and the hinge shaft H2 penetrates the two protruding arms 214 of the bracket 21 and the backrest arms 201 accommodated between the two protruding arms 214, thereby achieving the rotatable mounting of the bracket 21 to the backrest assembly 20. The first elastic member S1 may be a compression spring connected between the front wall 213 of the bracket 21 and the backrest arm 201, and fig. 9A also shows a spring groove 201a provided in the backrest arm 201 for receiving the compression spring as the first elastic member S1. And lock shaft 4 is disposed transversely between the two projecting arms 214. As the bracket 21 is rotated relative to the hinge shaft H2 in a direction in which the lock shaft 4 is caught in the lock groove 3, the compression deformation of the compression spring is gradually reduced, and thus, the elastic force of the compression spring may cause the bracket 21 to have a rotation in a direction in which the lock shaft 4 is caught in the lock groove 3. In fig. 7, the bracket 21 is rotated in the forward movement direction about the lower end 211, and the lock shaft 4 is caught in the lock groove 3. The structure is simple in structure and compact in arrangement. In another embodiment, the first elastic member S1 may also be an extension spring connected between the bracket 21 and the backrest arm 201, and arranged such that the extension deformation thereof is gradually reduced as the bracket 21 is rotated relative to the hinge shaft H2 in a direction in which the latch shaft 4 is caught in the latch groove 3. In a further embodiment, the first elastic member S1 may be a tension spring provided between the lock shaft 4 and, for example, the engaging member 1, and always has a tension elastic force that pulls the lock shaft 4 into the lock groove 3.

The first elastic member S1 may be included as a part of the adjustment assembly 2, that is, the adjustment assembly 2 may include the first elastic member S1. As mentioned above, in the illustrated embodiment, the elastic force of the second elastic element S2 may enable the protrusion 523 of the sidewall 521 of the movable element 52 to block the opening of the locking groove 3, so as to prevent the locking shaft 4 from entering the locking groove 3, and thus the force of the first elastic element S1 to enable the locking shaft 4 to be clamped into the locking groove 3 may overcome the force of the second elastic element S2 to prevent the locking shaft 4 from entering the locking groove 3. For example, the elastic force of the first elastic member S1 may be made larger than the elastic force of the second elastic member S2. The backrest module 20 can be manually rotated to (or close to) the first position P1, and under the elastic force of the first elastic member S1, the lock shaft 4 can push the movable member 52 from the position of fig. 4 to the position of fig. 3, and at the same time, the lock shaft 4 can enter the lock slot 3, so that the backrest module 20 can be opened or unfolded and can be fixed.

In the embodiment shown, the fitting part 1 further has a bayonet 6. The backrest assembly 20 is configured to be rotatable via a first position P1 to a second position P2, i.e., from the condition position of fig. 9C to the condition position of fig. 9D. As shown in fig. 9D, in the second position P2, the latch shaft 4 is latched into the latch 6, so that the backrest assembly 20 is in a fully unfolded state relative to the seat cushion assembly 30. In the wheelchair 100, in the fully deployed state, the angle between the backrest assembly 20 and the seat cushion assembly 30 is preferably 180 to 220 °, more preferably 188 to 198 °, and in the preferred embodiment shown 193 °. The angle at this time is shown as α 2 in fig. 9D. Thus, with the illustrated wheelchair 100, the seat assembly 30 is provided with rollers 309 near an end (lower end in fig. 8) opposite the end where the back assembly 20 is hinged, allowing the back assembly 20 to act as a handle or handle similar to a luggage pull rod and the seat cushion assembly 30 to act as a luggage case similar to a luggage case in this fully deployed state, thereby forming a luggage case mode in fig. 8, allowing the entire wheelchair 100 to be towed. In the illustrated embodiment, the bayonet 6 is a notch opened on both sides of the fitting part 1, and in the figure, is a notch opened on both the front side and the lower side of the fitting part 1, and such a notch structure can be easily operated by a user to separate the lock shaft 4 from the bayonet 6. It can be understood that the bayonet 6 may be a notch with one side opened, and the lock shaft 4 may be limited. The second position P2 may also be referred to as a handle position. In the figures, the backrest module 20 is rotated in opposite directions from the backrest position to the handle position and from the backrest position to the folded position.

In the illustrated embodiment, similar to the rolling surfaces 12, the mating part 1 may also provide smooth rolling surfaces 12a for guiding the locking shaft 4 to snap into the bayonet 6, as can be seen in fig. 9A to 9D. The arc over which rolling surface 12a extends may coincide with the arc over which rolling surface 12 extends.

As shown in fig. 1, the backrest module 20 may have backrest arms 201 on both sides, and a cross arm 202 connecting the two backrest arms 201. A state adjusting device 10 may be provided corresponding to each backrest assembly 20. In the illustrated embodiment, the unlocking lever 24 is connected between the ends 212 (shown in fig. 1) of the brackets 21 of the two state adjusting devices 10 opposite to the lock shaft 4, and the unlocking in the back-to-back unfolding state or the fully unfolding state can be achieved by manually operating the unlocking lever 24 to rotate the brackets 21 until the lock shaft 4 is disengaged from the lock groove 3.

In the illustrated embodiment, the wheelchair 100 also includes a front wheel assembly 40 and a rear wheel assembly 50, wherein both the front wheel assembly 40 and the rear wheel assembly 50 are foldable relative to the seat cushion assembly 30, e.g., hingedly mounted below the seat cushion assembly 30. For example, in fig. 10A, the front wheel assembly 40 with the upper end 401 hinged below the seat cushion assembly 30 can be folded relative to the seat cushion assembly 30 by pulling of a link 400, the front end 400A of the link 400 can be hinged with the front wheel assembly 40, and the rear end 400b of the link 400 can be connected with a slider movable back and forth relative to the seat cushion assembly 30, which can slide, for example, by an electric motor control drive. The rear wheel assembly 50, the upper end 501 of which is hinged below the seat cushion assembly 30, can be folded relative to the seat cushion assembly 30 by pulling on a link 500, the rear end 500b of which 500 can be hinged with the rear wheel assembly 50, while the front end 500a of which 500 can be connected with a slide block which can move back and forth relative to the seat cushion assembly 30, and which can slide, for example, by being electrically driven by a motor.

In figure 8, the rollers 309 disposed near the lower end of the seat assembly 30 may be disposed on the front wheel assembly 40 such that the rollers 309 are displaced near the lower end of the cushion assembly 30 when the front wheel assembly 40 is folded adjacent to the cushion assembly 30.

Reference may be made to fig. 10A to 10E, wherein G0 denotes the ground. The front wheel assembly 40 can be transitioned from the upright position of fig. 10A to the folded position of fig. 10B. From the state of fig. 10B, the rear wheel assembly 50 can be gradually transformed into the folded state of fig. 10E via the states of fig. 10C and 10D. In fig. 10E, the rear wheel 50a of the rear wheel assembly 50 is partially accommodated in the accommodating case, and the rear wheel support 50b of the rear wheel assembly 50 automatically pulls the trigger end 511 of the trigger lever 51 of the state adjusting apparatus 10 during this transition, as shown by the position AP shown in fig. 10E, the rear wheel support 50b contacts the trigger end 511 of the trigger lever 51. As described above, the trigger end 511 of the trigger lever 51 may be provided with the roller 511a, and the rear wheel support 50b may be in rolling contact with the trigger lever 51.

This automatic pulling causes the unlocking assembly 5 to unlock the back-rest unfolded state caused by the locking shaft 4 being caught in the locking groove 3, and thus the back-rest assembly 20 is separated from the back-rest unfolded state as shown in fig. 10E to 10G, and reaches the folded state under the action of gravity as shown in fig. 10G. That is, during the folding process of the wheelchair 100, the cushion assembly 30 of the wheelchair 100 is in a substantially vertical position, the triggering end 511 of the triggering rod 51 contacts with the rear wheel support 50b of the wheelchair 100, and then the movable member 52 contacting with the triggering rod 51 is pushed, the movable member 52 pushes out the locking shaft 4 in the locking groove 3, and the backrest assembly 20 which is not locked automatically folds under the action of gravity.

Fig. 10G to 10H also show that the front wheel assembly 40 continues to fold at this time. Eventually, the wheelchair 100 reaches a fully collapsed position, folding into a substantially box-like configuration of minimized volume, as shown in figure 10H. Thus, the above-mentioned posture adjusting device 10 can realize the folding automation of the backrest assembly 20 while the frame structure of the wheelchair 100 is folded, and can interact with the rear wheel assembly 50, particularly the rear wheel support 50b thereof, overcoming the problem that the backrest assembly 20 is difficult to be linked with other assemblies for synchronous operation without being attached to any other structure.

As mentioned above, the fitting part 1 further has the bayonet 6, and the user can rotate the backrest module 20 from the state of fig. 10H to the second position P2 via the first position P1, that is, the luggage state shown in fig. 8 can be reached. In which the backrest module 20 is in a fully unfolded state, the backrest module 20 may function as a luggage handle, and the folded body, which is composed of the cushion module 30, the front wheel module 40, and the rear wheel module 50, may function as a trunk of the luggage, so that the user can conveniently pull the entire wheelchair 100. If the seat cushion assembly 30 is horizontally disposed as in the use state, the height of the folded body formed by the seat cushion assembly 30, the front wheel assembly 40 and the rear wheel assembly 50 is too low, and if the seat cushion assembly 30 is vertically disposed, as shown in fig. 8, the backrest assembly 20 is folded to serve as a handle, and the height of the folded body is high, so that the backrest assembly 20, particularly the cross arm 202 thereof, can be used as a handle for pulling the luggage during the transportation of the wheelchair 100. At this point, the backrest assembly 20 or wheelchair 100 may be considered in the luggage mode.

The state adjustment device 10 can make the wheelchair 100 be matched with the multi-mode folding backrest assembly 20, can be matched with the frame structure of an automatic folding wheelchair, for example, a wheelchair which can be automatically folded by shifting the center of gravity, and can make the backrest assembly 20 be synchronously folded when the wheelchair 100 is folded. The backrest assembly 20 can be respectively used for folding the backrest, unfolding the backrest and serving as a handle for moving the luggage case, wherein the backrest is unfolded and serving as a handle for moving the luggage case, and the position of the backrest assembly 20 can be fixed by a buckle, for example.

Taking the wheelchair 100 capable of being automatically folded as an example, after the frame structure of the wheelchair 100 is automatically unfolded, the lock slot 3 may be in an open state, and the user may manually open the backrest assembly 20, and after the lock shaft 4 enters the lock slot 3, the backrest assembly 20 may be fixed in the backrest position, i.e., the first position P1, and at this time, if the backrest assembly 20 needs to be folded, the trigger lever 51 of the unlocking assembly 5 needs to be pressed. When the frame structure of the wheelchair 100 is automatically folded, the lock shaft 4 is pushed out of the lock slot 3 by the trigger rod 51 pushed by the rear wheel assembly 50 via the movable member 52, and the backrest assembly 20 is turned downward to the folding position P0 under the action of gravity, so that the entire automatic folding of the wheelchair 100 can be realized in a matching manner.

In the unfolded state of the wheelchair 100, the backrest assembly 20 is firstly folded to the handle position of the luggage mode before being folded, and the wheelchair can enter the luggage mode after being automatically folded. In the folded state of the wheelchair 100, if the luggage mode is required during transportation, the backrest assembly 20 needs to be opened and folded, and during the folding process, the state adjusting device 10 is in the folded state shown in fig. 9A, the trigger rod 51 pushed by the rear wheel assembly 50 blocks the lock slot 3 at the backrest position, so that the wheelchair can jump over the backrest position and be directly folded to the handle position, thereby entering the luggage mode.

The unlocking assembly 5 of the above-mentioned state adjusting device 10 can make the backrest assembly 20 jump over the backrest position in the folded state, so that the backrest assembly 20 in the folded state can be folded directly to the handle position of the luggage mode to jump over the backrest position if the luggage mode is to be entered after folding, and similarly, the backrest assembly 20 in the luggage mode can also jump over the backrest position directly to the folded position if the luggage mode is to be folded. Thus, the process and time for the user to unlock may be reduced.

Generally, above-mentioned state adjusting device makes the subassembly of leaning on have three lock positions, folding position, the position of leaning on and the position of handle respectively, can skip when the wheelchair of figure shows is folding the position of leaning on and directly change between folding position and the position of handle, just can get into and lean on the mode when the wheelchair expandes, and this state adjusting device can let and lean on the subassembly turn over a book "intellectuality", and can simplify the operation, raises the efficiency.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims (10)

1. A condition adjustment device for adjusting the condition of a backrest assembly relative to a seat cushion assembly, said backrest assembly being rotatably mounted to said seat cushion assembly, said condition adjustment device comprising:

a mating member mounted to a first one of the seat cushion assembly and the back rest assembly, the mating member having a locking slot; and

an adjustment assembly mounted to a second one of the cushion assembly and the back assembly, the adjustment assembly provided with a lock shaft;

the backrest assembly is configured to be rotatable to a first position in which the lock shaft is snapped into the lock slot, whereby the backrest assembly is in a backrest unfolded state relative to the seat cushion assembly.

2. The condition adjustment device of claim 1, further comprising an unlocking assembly, the unlocking assembly comprising:

a trigger lever rotatably mounted to the first party; and

the movable part is movably supported on the matching part and is pushed by one end of the trigger rod along with the rotation of the trigger rod, so that the lock shaft is pushed to be separated from the lock groove.

3. The condition adjusting device as claimed in claim 2, wherein the unlocking assembly further comprises a second elastic member, an elastic force of which has a tendency to cause the trigger lever to push the movable member.

4. The condition adjustment device according to claim 3,

the matching component is provided with a sliding groove on each of two sides;

the movable part comprises two side walls and a bottom wall which form a U shape, the two side walls are respectively in sliding fit with the sliding grooves on two sides of the matching part, the bottom wall is pushed by the trigger rod, and the free ends of the two side walls push the lock shaft.

5. The condition adjusting apparatus according to claim 4, wherein the lock groove communicates with the slide grooves of the engaging member on both sides thereof at both ends in the groove length direction, respectively;

the free ends of the two side walls are respectively provided with a bulge which protrudes towards each other, and the bulges are stopped by the groove bottom of the locking groove.

6. The condition adjustment device of claim 1, wherein the adjustment assembly further comprises:

the support is rotatably arranged on the second side, and the lock shaft is arranged at one end of the support; and

and the first elastic piece is arranged between the bracket and the second side, and the elastic force of the first elastic piece has the tendency that the lock shaft keeps being clamped into the lock groove.

7. The condition adjustment device of claim 1, wherein the first party is the seat cushion assembly.

8. Condition conditioning device as claimed in any of the claims 1 to 7,

the matching part is also provided with a bayonet;

the backrest assembly is configured to be rotatable from the first position to a second position in which the latch shaft is snapped into the bayonet, whereby the backrest assembly is in a fully deployed state relative to the seat cushion assembly.

9. A wheelchair comprising a condition adjustment device as claimed in any one of claims 1 to 8.

10. The wheelchair of claim 9 comprising a backrest assembly and a seat cushion assembly;

in a back unfolding state, an included angle between the back assembly and the seat cushion assembly is 98-108 degrees; and/or

In a fully unfolded state, an included angle between the backrest assembly and the cushion assembly is 188-198 degrees.

Images