CN115429561A

CN115429561A - Hand subassembly, lean on and hold up subassembly and wheelchair

Info

Publication number: CN115429561A
Application number: CN202110624734.7A
Authority: CN
Inventors: 杨扬
Original assignee: Shanghai Kuzhe Power System Co ltd
Current assignee: Shanghai Kuzhe Power System Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-12-06

Abstract

The invention provides a hand assembly which is used for being installed to a backrest assembly, wherein the backrest assembly is provided with an installation section extending vertically on the side edge, the hand assembly comprises a folding assembly, the folding assembly comprises a handrail, a first rod and a second rod, the handrail is provided with a rod section, and the rod section, the first rod, the second rod and the installation section form a first hinge four-bar mechanism, wherein the rod section and the installation section respectively form a connecting rod and a rack of the first hinge four-bar mechanism, and the first rod and the second rod respectively form a connecting rod of the first hinge four-bar mechanism, which is positioned on the upper side and the lower side. The invention also provides a leaning and supporting component comprising the walking component and a wheelchair. The hand-held assembly can be conveniently folded.

Description

Hand subassembly, lean on and hold up subassembly and wheelchair

Technical Field

The invention relates to a hand assembly, a back assembly and a wheelchair.

Background

The folding wheelchairs in the market at present basically adopt two folding modes, the first mode is that frames on two sides of the wheelchairs are folded inwards, if a cushion is arranged, the cushion needs to be manually removed before the folding, a backrest is generally a thin layer of fabric or if a cushion is arranged, the backrest needs to be removed before the folding wheelchairs are stored in addition, most of the armrests of the wheelchairs in the folding mode are fixed, and the whole armrests can be turned to the back of the backrest in some modes at present, so that a user can get on or off the wheelchairs conveniently. The second is that a plurality of groups of link mechanisms are adopted for folding, the backrest is generally provided with a spongy cushion, most of the armrests of the wheelchair with the structure can be folded, and most of the armrests are used as a part of a folding frame and are folded synchronously during folding, so that complex unlocking actions are needed when the wheelchair is folded backwards. The backrest and the armrests of the wheelchair with the two folding modes do not have a scheme with high comfort and simple operation.

The inventor finds that in the design of the prior foldable handrail, the rotating axle center of one end of the handrail is always fixed on the frame of the backrest, and the structure causes that the height of the turned-up handrail is higher in the process of turning back the handrail, and a user needs to do a larger action in the process of turning over the handrail on the same side by using the hand on the same side. In addition, when the unlocking operation is required, the unlocking operation cannot be performed with one hand in general when the armrest is unlocked, which is a bad experience for users who are not convenient to use their hands and feet.

Accordingly, there is a need to provide a walking assembly that facilitates the folding operation, such as may be used in a wheelchair.

Disclosure of Invention

The invention aims to provide a walking assembly convenient for folding operation.

The invention provides a handrail assembly, which is used for being mounted to a backrest assembly, wherein the backrest assembly is provided with a vertically extending mounting section at the side edge, the handrail assembly comprises a folding assembly, the folding assembly comprises a handrail, a first rod and a second rod, the handrail is provided with a rod section, the first rod, the second rod and the mounting section form a first hinge four-bar mechanism, the rod section and the mounting section respectively form a connecting rod and a frame of the first hinge four-bar mechanism, and the first rod and the second rod respectively form connecting rods of the first hinge four-bar mechanism, which are positioned at the upper side and the lower side.

In one embodiment, said first four-bar linkage is arranged to be switchable from an unfolded state, in which the angle between said first bar and said bar section is α 1 and the nip is directed downwards, to a folded state, in which the angle between said first bar and said bar section is α 2 and the nip is directed upwards, wherein α 1 is 150-180 ° and α 2 is 0-30 °.

In one embodiment, α 1 is 170 to 180 ° and α 2 is 0 to 10 °.

In one embodiment, the walking assembly further comprises a locking assembly for locking the state of the first articulated four-bar mechanism.

In one embodiment, the first articulated four-bar mechanism has a deployed state for walking; the locking assembly is used for locking the unfolding state.

In one embodiment, the locking assembly locks the state of the first articulated four-bar mechanism by locking two members of the bar segment, the first bar, the second bar and the mounting segment.

In one embodiment, the locking assembly comprises a handle, a lock block and a third rod, the armrest has a branch section, the handle, the lock block, the third rod and the branch section form a second four-bar hinge mechanism, wherein the branch section and the third rod respectively form a frame and a connecting rod of the second four-bar hinge mechanism, and the handle and the lock block form two connecting rods of the second four-bar hinge mechanism; in the second articulated four-bar mechanism, the handle is provided to be rotatable with respect to the leg so that the lock piece is rotated with respect to the leg of the armrest between a lock position in which the lock piece engages the first rod, thereby locking the first rod and the armrest, and an unlock position in which the lock piece disengages the first rod, thereby unlocking the lock between the first rod and the armrest.

In one embodiment, the lock block has a locking hook; the first rod is fixedly connected with a first hinge shaft and is hinged with the mounting section through the first hinge shaft, and the lock hook hooks the first hinge shaft at the locking position, so that the lock block is buckled with the first rod.

In one embodiment, the second articulated four-bar mechanism is an anti-parallelogram mechanism, wherein the articulation of the lock block with the third bar is located above the articulation of the lock block with the branch section, and the articulation of the handle with the branch section is located above the articulation of the handle with the third bar.

In one embodiment, a first elastic member is further provided between the handle and the armrest, and the elastic force of the first elastic member causes the handle to have a tendency to keep the lock piece in the locked position.

In one embodiment, in the second articulated four-bar mechanism, an articulation shaft for articulating the third bar and the handle is located within a slide; a second elastic member is further provided between the third lever and the armrest, and the elastic force of the second elastic member causes the third lever to have a tendency to keep the lock piece in the locked position.

In one embodiment, the armrest has a housing extending forward and rearward and having an inverted U-shaped cross-section; the locking assembly is accommodated in the shell, and the manipulating end of the handle is exposed out of the front end of the shell and is used for manipulating the handle to rotate relative to the armrest.

In one embodiment, the walking assembly is used for a wheelchair, and the walking assembly further comprises a control assembly for controlling the advancing direction of the wheelchair, and the control assembly is arranged at the front end of the armrest.

In one embodiment, the manipulating assembly includes a manipulating base and a support, the manipulating base is provided with a manipulating rod for manual manipulation, the support is disposed at the front end of the armrest, and the manipulating base is supported on the support in a foldable manner and is configured to be switchable between an unfolded state in which the manipulating base is unfolded to the front side of the support and the manipulating rod is exposed at the upper side of the manipulating base, and a folded state in which the manipulating base is folded to the upper side of the support and the manipulating rod is located at the lower side of the manipulating base.

The invention also provides a backrest component, which comprises a backrest component and two handrail components, wherein the two handrail components are respectively installed on the installation sections of the backrest component on the two side edges.

In one embodiment, in the backrest module, a backrest frame provides the mounting section, a backrest cushion provides a backrest surface, the backrest cushion, the two push rods and the backrest frame form a third articulated four-bar mechanism, wherein the backrest cushion and the backrest frame form a link and a frame of the third articulated four-bar mechanism, respectively, the two push rods form two link bars of the third articulated four-bar mechanism, the backrest cushion is configured to be switchable from a first position to a second position via an intermediate position with respect to the backrest frame, the backrest cushion is closer to a front side in the first position than in the second position, one end of a third elastic member is connected to one of the two push rods, and the other end is connected to the backrest cushion, and an elastic force of the third elastic member causes the backrest cushion to have a tendency to switch from the intermediate position to the first position or the second position.

The invention also provides a wheelchair comprising the backrest support component. Above-mentioned hand subassembly, the handrail provides the pole section, connecting rod as hinge four-bar linkage, through hinge four-bar linkage, the handrail can be for back subassembly free motion, make the structure that handrail and back subassembly constitute can switch conveniently between the great user state of size and the less state of accomodating of size around and around overall structure, furthermore, when switching over to the state of accomodating from the user state, the user can operate less action range, even sit and do not change the position of sitting also can comfortably turn over the handrail on the wheelchair, especially, convenient folding operation.

The handrail assembly is further provided with a locking assembly, so that a user can conveniently release the locking state of the handrail by one hand and turn over the handrail.

Above-mentioned subassembly of backing up provides folding back structure, through above-mentioned structure, can reduce the projection area of side with backing up the frame coincidence in the side after the cushion is folded, then can provide good back especially lumbar support when the expansion, can compromise volume and travelling comfort simultaneously.

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:

figure 1 is a side view of the armrest assembly with the folding assembly in an intermediate state.

Figure 2 is a side view of the armrest assembly in another intermediate state of the folding assembly, the intermediate state of figure 2 being closer to the folded state than the intermediate state of figure 1.

Fig. 3 is a schematic view of the armrest inverted from top to bottom, with the shackle disengaged from the first hinge shaft and the folding assembly in an unfolded state.

Fig. 4 is a schematic view of the armrest inverted upside down, with the latch hook hooked to the first hinge shaft and the folding assembly in an unfolded state.

FIG. 5 is a schematic view of the locking assembly in a locked state.

FIG. 6 is a schematic view of the locking assembly in an unlocked state.

FIG. 7 is a schematic view of the locking assembly in another unlocked state.

Fig. 8 is a schematic view of a shackle.

Fig. 9 is a perspective view of the locking assembly.

Fig. 10 is another perspective view of the locking assembly.

Figure 11 is a schematic view of the armrest inverted upside down with the folding assembly in a folded position.

Figure 12 is a perspective view of the armrest assembly in a fully open, in-use position.

Figure 13 is another perspective view of the armrest assembly in a fully open use position.

Figure 14 is a perspective view of the armrest assembly in a fully stowed condition.

Figure 15 is another perspective view of the armrest assembly in a fully stowed condition.

FIG. 16 is a schematic view of an exemplary wheelchair with an exemplary armrest assembly in a fully open use condition.

Fig. 17A is a schematic view of the reclining assembly with the operator's seat switched from the flipped open state to the intermediate state relative to fig. 16.

Fig. 17B is a schematic view of the armrest assembly, wherein the console is switched from the intermediate state to the retracted state relative to fig. 17A.

FIG. 17C is a schematic view of the reclining assembly wherein the locking assembly is switched from a locked state to an unlocked state relative to FIG. 17B.

FIG. 17D is a schematic view of the reclining assembly wherein the folding assembly is switched from the unfolded state to a first intermediate state relative to FIG. 17C.

Figure 17E is a schematic view of the reclining assembly wherein the folding assembly is switched from a first intermediate state to a second intermediate state relative to figure 17D.

Figure 17F is a schematic view of the reclining assembly wherein the folding assembly is switched from the second intermediate state to the folded state relative to figure 17E.

Fig. 17G is a schematic view of a backrest assembly with a cushion in the backrest assembly switched from a first position to an intermediate position relative to fig. 17F.

Fig. 17H is a schematic view of a bolster assembly with a bolster in the bolster assembly switched from a neutral position to a second position relative to fig. 17G with the example bolster assembly in a fully collapsed, stowed state.

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.

Fig. 16 illustrates an exemplary overall configuration of the wheelchair 100, wherein the wheelchair 100 includes an exemplary hand assembly 10 provided by the present invention, and in fig. 16, the wheelchair 100 is resting on the ground G0. The wheelchair 100 may include a armrest assembly 200. The armrest assembly 200 may include a hand assembly 10 and a back assembly 20. Although the armrest assembly 10 and armrest assembly 200 are shown in the illustrated embodiment as being used in a wheelchair 100, it will be appreciated that the armrest assembly 10 and armrest assembly 200 may be used in other settings, such as in a car seat, home seat, or office chair. 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.

As shown in fig. 1, in the armrest assembly 200, the armrest assembly 10 may be mounted to the backrest assembly 20. The backrest module 20 has vertically (in fig. 2, upward and downward) extending mounting sections 201 on the side edges. For convenience in description, spatial relational terms such as "lower", "upper", 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 herein with reference to a normal use condition when the user is leaning back against the backrest assembly 20, for example, "side" may be left or right of the user at that time, and "up side", "down side", etc. are also used as reference at that time. Furthermore, unless otherwise stated, the extension in a particular direction in the text does not require a strict mathematical definition to be followed, but requires that the direction of extension has a component in that particular direction, preferably an angle of less than 45 ° between the direction of extension and that particular direction. For example, in the illustrated embodiment, the mounting segment 201 defined as extending vertically may extend substantially strictly along the first direction D1, and the first direction D1 may have a component in the vertical direction. Preferably, the angle between the first direction D1 and the vertical is less than 45 °. In the illustrated embodiment, it is further preferred that the first direction D1 is inclined backwards by 10-30 ° with respect to the vertical, and even more preferably 13 ° with respect to the vertical, to improve the comfort of the user for leaning back. It will be understood that these terms of spatial relationship are 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 assembly in the drawings is turned over, elements described as being "under" other elements or features would instead be "over" the other elements or features, for example, when a user inverts the wheelchair for stowage in the collapsed stowage state. Therefore, the spatial relationship descriptors used herein should be interpreted accordingly. In the illustrated embodiment, the mounting section 201 may include two seat bodies 201a and 201b respectively disposed at two ends, for example, the seat body 201a may be a block fixed by a screw.

The walking assembly 10 includes a folding assembly 1. The folding assembly 1 comprises a handrail 2, a first bar 31 and a second bar 32. The handrail 2 has a pole section 21. The rod section 21 of the armrest 2, the first rod 31, the second rod 32, and the mounting section 201 of the backrest assembly 20 form a first articulated four-bar mechanism A1. The person skilled in the art knows that the articulated four-bar mechanism is a four-bar mechanism in which all kinematic pairs are revolute pairs, wherein one of the members is called a frame as a support base, the member directly articulated with the frame is called a side link, the member not directly connected with the frame is called a link, and further, the side link capable of making a complete revolution is called a crank, and the side link capable of reciprocating only within a certain angle range is called a rocker. In the first articulated four-bar mechanism A1, the bar section 21 and the mount section 201 constitute a link and a frame of the first articulated four-bar mechanism A1, respectively, and the first bar 31 and the second bar 32 constitute side links on the upper side and the lower side of the first articulated four-bar mechanism A1, respectively. That is, both ends of the rod section 21 may be respectively hinged to a first end (in fig. 1, upper end) of the first rod 31 and a first end (in fig. 1, upper end) of the second rod 32, and both ends of the mounting section 201 (specifically, the seat body 201a and the seat body 201 b) may be respectively hinged to a second end (in fig. 1, lower end) of the first rod 31 and a second end (in fig. 1, lower end) of the second rod 32, wherein the hinge position of the mounting section 201 and the first rod 31 is located at an upper side compared to the hinge position of the mounting section 201 and the second rod 32. The rod section 21 of the handrail 2, i.e. the part of the handrail 2 providing the hinge point B31 with the first rod 31 and the hinge point B32 with the second rod 32. It is understood that the combination of the bar section 21, the first bar 31, the second bar 32 and the mounting section 201 into the first articulated four-bar linkage A1 means that it forms the first articulated four-bar linkage A1 at least in one state, and does not exclude that there may be other combinations in another state, in other words, the four members forming the first articulated four-bar linkage A1 (i.e., the bar section 21, the first bar 31, the second bar 32 and the mounting section 201) may not be always articulated to each other, but have at least a state of being articulated to each other to form the first articulated four-bar linkage A1.

In the armrest assembly 10, the armrest 2 of the folding assembly 1 provides the rod section 21 as a link of the four-bar linkage, the backrest assembly 20 provides the mounting section 201 as a frame of the four-bar linkage, and the armrest 2 can flexibly move relative to the backrest assembly 20, so that the size of the structure formed by the armrest 2 and the backrest assembly 20 in at least the front-back direction can be changed, and therefore, the armrest assembly 10 can be conveniently switched between a state that the front-back size of the whole structure is larger and a state that the front-back size of the whole structure is smaller. In a state where the front-rear dimension of the overall structure is large, the user can hold the handrail 2, which may also be referred to as a use state of the handrail assembly 10. In the state that the front and rear dimensions of the overall structure are small, the user can conveniently place the hand holding assembly 10 and the backrest assembly 20, which can also be referred to as the storage state of the hand holding assembly 10. When the armrest assembly 10 is used, the user can operate the armrest 2 with a small range of motion while turning the armrest 2, and can turn the armrest 2 comfortably while sitting on the wheelchair 100.

In the illustrated embodiment, the first articulated four-bar mechanism A1 is provided to be switchable from the unfolded state to the folded state. This switching process can be seen in fig. 17B to 17F, the first articulated four-bar mechanism A1 being switched from the unfolded state of fig. 17B to the folded state of fig. 17F via the intermediate states of fig. 17C, 17D, 17E in sequence. In the unfolded state shown in fig. 17B, the angle between the first rod 31 and the rod segment 21 is α 1 with the nip facing downwards, α 1 may be 150-180 °, and more preferably α 1 may be 170-180 °. In the folded position shown in fig. 17F, the angle between the first rod 31 and the rod section 21 is α 2 with the nip facing upwards, α 2 being 0-30 °, even more preferably α 2 being 0-10 °. Taking "α 1 is 150 to 180 °" as an example, the range value includes two endpoints, that is, α 1 may be 150 °, 180 °, or a value between 150 ° and 180 °. In the intermediate state of fig. 17D and 17E, the angle between the first rod 31 and the rod segment 21 is shown at α. In the unfolded state of fig. 17B, the user may use the hand assembly 10, i.e. the hand handrail 2, and in the folded state of fig. 17F, the user may stow the hand assembly 10 or even the hand assembly 200. In the preferred embodiment shown, α 1 is 173.6 ° and α 2 is 5.4 °. Thus, the unfolding is more sufficient, and the folding is more compact. It is possible to provide the first articulated four-bar mechanism A1 as a crank-rocker mechanism, wherein the first bar 31 constitutes the crank of the crank-rocker mechanism and the second bar 32 constitutes the rocker of the crank-rocker mechanism. For example, the first rod 31 as a crank may be the shortest rod among the four members constituting the articulated four-bar mechanism A1. It will be appreciated that the rod length is based on the distance between the hinge points (hinge centres) at the ends of the respective members, and not necessarily the length of the members themselves.

In the illustrated embodiment, in the deployed state shown in fig. 17B, the included angle β between the armrest 2 and the backrest module 20 (specifically, the mounting segment 201) is 90-120 °, preferably 101.4 °. In the folded condition shown in fig. 17F, the included angle β between the armrest 2 and the backrest module 20 (specifically, the mounting segment 201) is-10-20 °, preferably 0 °. From fig. 17B to fig. 17F, the included angle β increases and then decreases. It will be appreciated that an angle of-10 between the arm rest 2 and the back assembly 20, for example-10, means that the arm rest 2 is inclined rearwardly 10 with respect to the back assembly 20.

It is understood that the use of particular words herein to describe one embodiment of the invention, such as "one embodiment," "an embodiment," and/or "another embodiment" mean that 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 "an embodiment" or "one 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.

In the illustrated embodiment, the hand held assembly 1 may further include a locking assembly 4. The locking assembly 4 can lock the state of the first articulated four-bar mechanism A1. For example, the first articulated four-bar linkage A1 may be locked in the unfolded state of fig. 17B, or in the folded state of fig. 17F, or in any one of the intermediate states of fig. 17D or 17E by the locking assembly 4. For example, the locking assembly 4 may be a removable fastener that can secure the first rod 31 that makes up the first articulated four-bar mechanism A1, to other components of the first articulated four-bar mechanism A1, or to the backrest assembly 20, or to other parts of the wheelchair 100, such as the seat cushion, such that the first rod 31 cannot rotate relative to the hinged position at either end. The fasteners may be, for example, screws, bolts, or alternatively, locking pins, tape, cord, staples, and the like.

As described above, the first articulated four-bar mechanism A1 has the unfolded state for walking, as shown in fig. 17B. The locking assembly 4 may be used to lock the deployed state. Therefore, the whole structure is more reliable and cannot be instable when the device is used by a user.

Locking assembly 4 can lock the state of first articulated four-bar mechanism A1 by locking two members of bar section 21 of armrest 2, first bar 31, second bar 32, and mounting section 201 of backrest assembly 20. That is, any two members selected from the four members of the rod section 21, the first rod 31, the second rod 32, and the mounting section 201 may be selected, and the locking assembly 4 may lock-hold the state of the first four-bar linkage A1 by locking the selected two members so that the two members cannot move relative to each other. In one embodiment, for example, a stay may be additionally disposed between the rod segment 21 and the mounting segment 201 shown in fig. 1 as the locking assembly 4, and the rod segment 21 and the mounting segment 201 may be locked to prevent the rod segment 21 and the mounting segment 201 from moving relatively, thereby locking the state of the first articulated four-bar mechanism A1.

Referring to fig. 3-11, locking assembly 4 may include a handle 41, a lock block 42, and a third rod 33. The handrail 2 may have a branch 22. As shown in fig. 5, the handle 41, the lock block 42, the third rod 33 and the branch section 22 (simplified to be shown by broken lines in fig. 5 for clarity) constitute a second four-bar hinge mechanism A2. The branch 22 and the third rod 33 respectively form a frame and a connecting rod of the second four-bar linkage A2, and the handle 41 and the locking block 42 form two side links of the second four-bar linkage A2. That is, two ends of the branch section 22 may be hinged to the first position 411 of the handle 41 and the first position 421 of the locking block 42, respectively, and two ends of the third rod 33 may be hinged to the second position 412 of the handle 41 and the second position 422 of the locking block 42, respectively. The branch section 22 of the armrest 2, i.e., the portion of the armrest 2 that provides the hinge point B41 with which the handle 41 is hinged and the hinge point B42 with which the lock block 42 is hinged. It will be appreciated that the rod section 21 and the leg section 22 of the handrail 2 are not required to be separate parts, but may be the same part or may be two parts that partially overlap. Similarly to the aforementioned first articulated four-bar mechanism A1, the four members (i.e., the handle 41, the lock block 42, the third lever 33, and the branch section 22) constituting the second articulated four-bar mechanism A2 may not be always articulated to each other, but may have at least a state of being articulated to each other to constitute the second articulated four-bar mechanism A2, which is the case in the illustrated embodiment, which will be described later in detail.

In the second articulated four-bar mechanism A2, the handle 41 is provided to be rotatable with respect to the leg 22 of the armrest 2, so that the lock block 42 is rotated with respect to the leg 22 of the armrest 2 between the lock position C1 and the unlock position C2, as shown in fig. 5 to 6. In the locking position C1 in fig. 5, the lock block 42 is fastened to the first lever 31 constituting the first articulated four-bar mechanism A1, thereby locking the first lever 31 and the armrest 2, see fig. 4. In the unlock position C2, the lock block 42 is disengaged from the first lever 31, thereby unlocking the lock between the first lever 31 and the armrest 2. That is, by pulling the handle 41, the handle 41 is rotated relative to the armrest 2 at the hinge position B41, and the lock block 42 hinged to the third lever 33 is rotated relative to the armrest 2 at the hinge position B42 by the driving action of the third lever 33 hinged to the handle 41, so that the lock position C1 for locking the first lever 31 and the unlock position C2 for releasing the first lever 31 can be freely switched, and the lock state for locking the first lever 31 to the armrest 2 and the unlock state for releasing the first lever 31 from the armrest 2 can be switched. In the locked state, the first lever 31 and the armrest 2 are locked, and the state of the first four-bar linkage A1 can be locked.

In the illustrated embodiment, lock block 42 may have a shackle 420. The first rod 31 may be fixedly connected with a first hinge shaft H1 and hinged with the mounting section 201 of the backrest assembly 20 through the first hinge shaft H1. Referring to fig. 4, in the locking position C1, the locking hook 420 of the locking piece 42 hooks the first hinge shaft H1 to which the first rod 31 is fixedly connected, whereby the locking piece 42 buckles the first rod 31. The locking assembly 4 is compact and convenient to operate.

As can be seen in fig. 5, the second articulated four-bar mechanism A2 may be an anti-parallelogram mechanism. It is known to those skilled in the art that the anti-parallelogram mechanism, i.e. the line connecting the two hinge points of the frame, crosses the line connecting the two hinge points of the link. In the second articulated four-bar mechanism A2, the hinge position of the lock block 42 and the third bar 33 (i.e., the second position 422 of the lock block 42) as a side link is located on the upper side of the hinge position of the lock block 42 and the leg 22 (i.e., the first position 421 of the lock block 42 or the hinge position B42 of the leg 22), and the hinge position of the handle 41 and the leg 22 (i.e., the first position 411 of the handle 41 or the hinge position B41 of the leg 22) is located on the upper side of the hinge position of the handle 41 and the third bar 33 (i.e., the second position 412 of the handle 41). Thus, by pulling the front end of the handle 41 slightly upward with the finger, that is, rotating the handle in the clockwise direction (labeled as R1 in fig. 6) in fig. 5, the lock block 42 can be rotated in the counterclockwise direction (labeled as R2 in fig. 6) in fig. 5, and the lock hook 420 under the hinge position B42 can be changed from the locking position C1 in fig. 5 to the unlocking position C2 in fig. 6.

In the embodiment shown in fig. 5 and 6, a first elastic member S1 is further provided between the handle 41 and the armrest 2, and the handle 41 has a tendency to be held in the locking position C1 by the elastic force of the first elastic member S1. For example, in fig. 5, a compression spring is provided between the front end of the handle 41 and the portion of the armrest 2 above the handle 41, and as the first elastic member S1, the elastic force of the compression spring causes the front end of the handle 41 to have a tendency to move downward, that is, the handle 41 has a tendency to rotate counterclockwise about the hinge position B41 in fig. 5, and thus, by the urging action of the third lever 33, the lock block 42 has a tendency to rotate clockwise about the hinge position B42 in fig. 5, that is, the handle 41 has a tendency to hold the lock block 42 in the lock position C1. That is, the first elastic member S1 provides a preload force to maintain the locking position of the handle 41. In another embodiment, the first elastic member S1 may be a tension spring provided between the front end of the handle 41 and a portion of the armrest 2 located below the handle 41. In still another embodiment, the tendency to keep the lock block 42 in the lock position C1 may also be achieved by an elastic member provided between the other two members among the four members constituting the second articulated four-bar mechanism A2.

In the illustrated embodiment, in the second articulated four-bar mechanism A2, the hinge shaft H33 for hinge-connecting the third bar 33 and the handle 41 is located within the slide 414. The slide 414 allows one end (in fig. 5, the front end) of the third lever 33 to slide with respect to the handle 41. In the illustrated embodiment, the hinge shaft H33 can be fixed to the third lever 33, while the slide 414 is constituted by a slide groove of the handle 41 in the form of a waist-shaped hole extending back and forth. It will be appreciated that in another embodiment, the articulation axis H33 may also be fixed to the handle 41, while the slide 414 may be provided by the third lever 33. Generally, when the lock block 42 is rotated counterclockwise (in the direction R2 in fig. 7) around the hinge position B42 from the lock position C1 in fig. 5, the pushing force of the lock block 42 on the third rod 33 is not enough to overcome the elastic force of the first elastic member S1, so that the handle 41 is not rotated around the hinge position B41 relative to the branch section 22 of the armrest 2, that is, at this time, the handle 41 and the armrest 2 can be regarded as an integral bracket fixedly connected to each other, and the front end of the third rod 33 slides forward (in the direction T1 in fig. 7) along the slide rail 414 from the state of fig. 5, thereby reaching the other unlocked state of fig. 7. In this process, the locking block 42, the third rod 33 and the integral support (composed of the armrest 2 and the handle 41) form a structure similar to a crank slider mechanism or a rocker slider mechanism, wherein the integral support, the locking block, the third rod and the hinge shaft respectively form a frame, a crank (or a rocker), a connecting rod and a slider sliding along the slide way 414 of the crank slider mechanism (or the rocker slider mechanism). With the illustrated third lever 33, the third lever 33 is slidable forward relative to the handle 41 by the hinge shaft H33 sliding forward along the slide 414, in addition to being rotatable relative to the handle 41 by the hinge shaft H33 at one end (in fig. 5, the rear end) of the slide 414. In other words, the locking assembly 4 can be switched from the state of fig. 5 to the state of fig. 6, and also from the state of fig. 5 to the state of fig. 7. As described previously, the four members constituting the second articulated four-bar mechanism A2 (i.e., the handle 41, the lock block 42, the third lever 33, and the leg 22) may not always be articulated to each other, but have a state in which they are articulated to each other so as to constitute the second articulated four-bar mechanism A2 (as shown in fig. 5 and 6), while having a state in which the third lever 33 is not articulated with respect to the handle 41 but constitutes a crank slider mechanism (or a rocker slider mechanism) (as shown in fig. 5 and 7).

In the illustrated embodiment, a second elastic member S2 may be provided between the third lever 33 and the armrest 2, and the elastic force of the second elastic member S2 causes the third lever 33 to have a tendency to keep the lock block 42 at the locking position C1. For example, in fig. 5, a compression spring is provided between the third lever 33 and the portion of the armrest 2 above the third lever 33, and as the second elastic member S2, the front end of the third lever 33 has a tendency to move rearward due to the elastic force of the compression spring, and the lock block 42 has a tendency to rotate clockwise about the hinge position B42 in fig. 5 by the urging action of the third lever 33, that is, the third lever 33 has a tendency to hold the lock block 42 in the lock position C1. In practical arrangement, the elastic force of the second elastic member S2 can be overcome more easily and the elastic force of the first elastic member S1 can be overcome more difficultly when the locking block 42 is actively rotated counterclockwise. That is, the second elastic member S2 provides the pre-load force of the locking piece 42.

The above structure enables a user to unlock the lock block 42 not only by pulling or lifting the front end of the handle 41 upward on the front side, but also by actively pulling the lock block 42 on the rear side.

Fig. 8 shows an example structure of the lock block 42, and the lock block 42 has a lock hook 420 on one side (in fig. 8, the front side) for hooking the first hinge shaft H1 to which the first lever 31 is fixedly secured, as described above. The lock block 42 has a protruding pulling portion 423 on the other side (in fig. 8, the rear side) for facilitating the user to pull the lock block 42 upward from the rear side of the lock assembly 4 so that the lock block 42 is disengaged from the lock position C1. The locking piece 42 may have a through hole at the first position 421 and the second position 422, respectively, through which a hinge shaft passes to hinge with the branch section 22 and the third rod 33 of the armrest 2, respectively, thereby forming the locking assembly 4. In fig. 8, the locking block 42 may further be provided with a magnet 424, and when the hand held assembly 10 is in the storage state of fig. 14, the magnet 424 of the locking block 42 may attract the magnet 324 provided in the second rod 32 to provide a restraining force for the storage state, in other words, the storage state may be locked. In fig. 8, the locking block 42 may further have a protruding edge 425, and when the walking assembly 10 is in the unfolded state of fig. 3, the first rod 31 may contact the edge 425 of the locking block 42, and the locking block 42 may rotate around the first position 421 by a certain angle, so that the locking hook 420 hooks the first hinge shaft H1. Fig. 9 and 10 also show the overall construction of the locking assembly 4 from different angles.

Fig. 11 shows an example configuration in which the locking assembly 4 is engaged with the armrest 2. The armrest 2 has a housing 23 extending forward and rearward and having an inverted U-shaped cross section. The rod section 21 and the branch section 22 of the handrail 2 can be provided by a housing 23. The locking assembly 4 may be housed within the housing 23. And a manipulation end (i.e., a front end) of the handle 41 may be exposed to the front end of the housing 23 for manipulation to rotate the handle 41 relative to the armrest 2. Thus, it is convenient for the user to toggle the state of the locking assembly 4 by pulling the handle 41 from the front side. Also shown in fig. 11 is a hinge shaft H31, by which the first lever 31 is hinged to the armrest 2.

In the handrail assembly 10, a user can unlock the state lock of the folding assembly 1 by one hand without changing the sitting posture, so that the handrail 2 can be turned over, and the action range is small.

In the embodiment shown in fig. 16, the walking assembly 10 may further include a steering assembly 30 for steering the advancing direction of the wheelchair 100, and the steering assembly 30 may be disposed at the front end of the armrest 2. Thus, the user can conveniently control the advancing direction of the wheelchair 100 when sitting on the wheelchair 100, and the wheelchair also conforms to the human engineering. In the illustrated embodiment, the manipulating assembly 30 may be disposed at the front end of the handle 2 by being connected to the front end of the handle 41, so that the entire structure is more simple and compact.

An example configuration of the steering assembly 30 can be seen in fig. 12-15. The manipulation assembly 30 may include a manipulation seat 301 and a bracket 302, wherein the bracket 302 may be disposed at a front end of the armrest 2. The manipulation stage 301 may be provided with a manipulation lever 303 for manual manipulation. The joystick 303 can be any conventional form, for example, a joystick lever, and a user can manipulate the joystick 303 manually, so that the joystick 303 can convert the movement of the joystick 303 into electronic information which can be processed by a control system of the wheelchair 100, thereby controlling the advancing direction of the wheelchair 100. The console 301 is supported on the stand 302 in a foldable manner so as to be switchable between an unfolded state (shown in fig. 16, see also fig. 12 and 13) and a folded state (shown in fig. 17B, see also fig. 14 and 15), and fig. 17A also shows an intermediate state for switching from the unfolded state of fig. 16 to the folded state of fig. 17B. In the opened state of fig. 16, the handle base 301 is opened to the front side of the bracket 302, and the handle bar 303 is exposed on the upper side of the handle base 301. In the retracted state shown in fig. 17B, the console 301 is retracted above the frame 302, and the joystick 303 is located under the console 301. As shown in fig. 12, the rack 302 may include a fulcrum plate 306 and two supporting columns 305 distributed right and left at a front end of the fulcrum plate 306, a rear end of the manipulation base 301 may be hinged to the two supporting columns 305, and a rear end of the manipulation base 301 is disposed between the two supporting columns 305, so that the manipulation base 301 may be supported to the rack 302 in a foldable manner with respect to the rack 302. In the opened state of fig. 12 and 13, the console 301 and the fulcrum 306 of the bracket 302 can be substantially in the opened 180 ° state, and in the retracted state of fig. 14 and 15, the console 301 and the fulcrum 306 of the bracket 302 can be substantially in the retracted 0 ° state. In the figure, the fulcrum plate 306 may further have a placing hole 304 for allowing the lever 303 under the manipulation seat 301 to pass through in the folded state. The control base 301 can protect the control rod 303 when being folded (or referred to as folded).

With continued reference to fig. 12-15, the armrest assembly 200 may include two armrest assemblies 10. Two hand assemblies 10 may be mounted to the mounting sections 201 of the backrest assembly 20 on both sides, respectively. In the illustrated embodiment, the two mounting sections 201 may be formed of two pipes, such as steel pipes, and in another embodiment, the two mounting sections 201 may be formed of two portions of a back plate on both sides.

In the illustrated embodiment, the backrest assembly 20 may include a backrest frame 202, and the backrest frame 202 may provide the two mounting sections 201. In the illustrated embodiment, the backrest frame 202 includes two vertical tubes 203 and a cross tube 204, the cross tube 204 connecting the two vertical tubes 203 at upper sides of the two vertical tubes 203, and the two vertical tubes 203 can be supported on the wheelchair 100, such as on a seat cushion. The two vertical pipes 203 and the horizontal pipe 204 may be formed by bending a single pipe, or may be formed by welding after being processed respectively. Two risers 203 may provide the two mounting sections 201 described above, respectively.

The backrest assembly 20 may also include a back pad 5, and the back pad 5 may provide a backrest surface 51 for a user to lean against. The back cushion 5 may be made of a soft material, for example, to improve the comfort of the user against the back.

The backrest assembly 20 may further include upper and

lower push rods

61, 62. The backrest cushion 5, the two

push rods

61, 62 and the backrest frame 202 may constitute a third articulated four-bar mechanism A3. Wherein, the back cushion 5 and the back rest frame 202 respectively form a connecting rod and a frame of the third articulated four-bar mechanism A3, and the two

push rods

61 and 62 form two connecting rods of the third articulated four-bar mechanism A3. The backrest cushion 5 is configured to be switchable relative to the backrest frame 202 from a first position P1 (shown in fig. 17F, see also fig. 12 and 13) via an intermediate position P0 (shown in fig. 17G) into a second position P2 (shown in fig. 17H, see also fig. 14 and 15). The cushion 5 is closer to the front side in the first position P1 than in the second position P2. In other words, the backrest 5 is moved from the first position P1 to the second position P2, substantially from the rear to the front. In the illustrated embodiment, the backrest 5 is moved from the first position P1 to the second position P2 and can also be moved from the bottom to the top. In a preferred embodiment, in the first position P1, a side projection of the backrest cushion 5 may coincide with the backrest frame 202.

The backrest assembly 20 may further include a third elastic member S3. One end of the third elastic member S3 may be connected to one push rod 61 of the two

push rods

61, 62, and the other end is connected to the back pad 5. The spring force of the third spring S3 causes the back pad 5 to have a tendency to switch from the intermediate position P0 to the first position P1 or the second position P2. That is, by providing the third elastic member S3, it is possible to make it difficult to maintain the cushion 5 at the intermediate position P0, and to maintain the cushion at the first position P1 or the second position P2 stably at all times. In the first position P1, it is convenient for the user to lean back, and in the second position P2, it is convenient for the user to store, that is, the third elastic element S3 provides the holding force for the cushion 5 after unfolding or folding. The structure is simple and reliable under the condition of realizing function diversification. For example, the third elastic member S3 may be an extension spring such that the extension spring has the smallest amount of extension at the first position P1 or the second position P2 and the largest amount of extension at the intermediate position P0. In the illustrated embodiment, the back of the backrest 5 is provided with a spring post 54, the push rod 61 is provided with a spring post 64, and the third elastic member S3 is a tension spring connected and fixed between the spring post 54 and the spring post 64.

In another embodiment, the retention of the backrest 5 in the first position P1 or the second position P2 can also be achieved by providing locking means. For example, when the back pad 5 reaches the first position P1, the fastener is manually used to lock it in the first position P1.

In the illustrated embodiment, the two sides of the backrest cushion 5 are provided with upper and lower push rods, respectively, for example, the upper and lower push rods on the right side are indicated by 61, 62, and the upper and lower push rods on the left side are indicated by 61a, 62a (as shown in fig. 12). The cushion 5, the two push rods (e.g. 61, 62, or 61a, 62 a) on each side, and the mounting section 201 of the side on which the two push rods are located all form a four-bar linkage. In other words, one side of the backrest cushion 5 is connected to the mounting section 201 of the one side by the

push rods

61, 62, and the other side is connected to the mounting section 201 of the other side by the

push rods

61a, 62 a. This structure is more reliable.

The backrest module 20, and in particular the backrest 5 thereof, can be unfolded or folded such that even the side projection of the folded backrest 5 coincides with the backrest frame 202, which when unfolded provides good back, and in particular lumbar support.

In general, the above-described armrest assembly 200 transitions from a fully expanded for use state to a fully collapsed, stowed state, as may be seen in the process of fig. 16-17H. For example, first, as shown in fig. 16 to 17B, the manipulating assembly 30 is transformed from the folded-out state to the folded-in state. Then, as shown in fig. 17C, the handle 41 of the locking assembly 4 of the hand assembly 10 is pulled upward. Then, as shown in fig. 17C to 17F, the folding assembly 1 of the walking assembly 10 is transformed from the unfolded state to the folded state. Finally, as shown in fig. 17F-17H, the back pad 5 of the backrest assembly 20 is transitioned from the first position P1 to the second position P2.

In the armrest assembly of the wheelchair, the structure of the armrest assembly enables a user to complete the action of turning over the armrest only by a small amplitude, and meanwhile, the locking assembly of the armrest can also complete unlocking through one-hand operation under the condition that the user does not change the sitting posture. The handle at the front end of the armrest is linked with the locking block at the rear end of the armrest, so that the user can operate unlocking action without leaving the armrest when unlocking, and the whole armrest can be turned over to the position overlapped with the backrest after being turned over backwards for a certain distance. The handle of the locking component is provided with a foldable control seat, and a control rod of the control seat can be folded and protected.

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 modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are within the scope of the present invention defined by the claims.

Claims

1. A hand assembly for mounting to a backrest assembly having a vertically extending mounting section at a side thereof, the hand assembly comprising:

the folding assembly comprises an armrest, a first rod and a second rod, wherein the armrest is provided with a rod section, the first rod, the second rod and the installation section form a first hinge four-bar mechanism, the rod section and the installation section respectively form a connecting rod and a rack of the first hinge four-bar mechanism, and the first rod and the second rod respectively form a connecting rod positioned on the upper side and the lower side of the first hinge four-bar mechanism.

2. The hand assembly of claim 1,

the first four-bar hinge mechanism is arranged to be switched from an unfolding state to a folding state, wherein in the unfolding state, an included angle between the first bar and the bar section is alpha 1, a clamping opening of the first bar faces downwards, in the folding state, an included angle between the first bar and the bar section is alpha 2, a clamping opening of the first bar faces upwards, wherein alpha 1 is 170-180 degrees, and alpha 2 is 0-10 degrees.

3. The hand assembly of claim 1, wherein the first articulated four-bar linkage has a deployed state for walking;

the hand assembly further comprises:

a locking assembly that locks the deployed state of the first articulated four-bar linkage by locking two members of the bar segment, the first bar, the second bar, and the mounting segment.

4. The hand assembly of claim 3,

the locking assembly comprises a handle, a locking block and a third rod, the handrail is provided with a branch section, the handle, the locking block, the third rod and the branch section form a second hinge four-bar mechanism, the branch section and the third rod respectively form a rack and a connecting rod of the second hinge four-bar mechanism, and the handle and the locking block form two connecting rods of the second hinge four-bar mechanism;

in the second articulated four-bar mechanism, the handle is provided to be rotatable with respect to the leg so that the lock piece is rotated with respect to the leg of the armrest between a lock position in which the lock piece engages the first rod, thereby locking the first rod and the armrest, and an unlock position in which the lock piece disengages the first rod, thereby unlocking the lock between the first rod and the armrest.

5. The hand assembly of claim 4,

a first elastic piece is arranged between the handle and the armrest, and the elastic force of the first elastic piece enables the handle to have the tendency of enabling the locking block to be kept in the locking position.

6. The hand assembly of claim 4,

in the second hinged four-bar mechanism, a hinged shaft for hinging the third bar and the handle is positioned in the slideway;

a second elastic member is further provided between the third lever and the armrest, and the elastic force of the second elastic member causes the third lever to have a tendency to keep the lock piece in the locked position.

7. The hand assembly of any of claims 4 to 6,

the handrail is provided with a shell which extends forwards and backwards and has an inverted U-shaped section;

the locking assembly is accommodated in the shell, and the manipulating end of the handle is exposed out of the front end of the shell and is used for manipulating the handle to rotate relative to the armrest.

8. A hand assembly according to any of claims 1 to 6, wherein the hand assembly is for a wheelchair, the hand assembly further comprising a steering assembly for steering the direction of travel of the wheelchair, the steering assembly being provided at a forward end of the armrest;

the manipulation assembly comprises:

the control seat is provided with a control rod for manual control; and

the support is arranged at the front end of the armrest, the control seat is supported on the support in a foldable mode and can be switched between an opening state and a folding state, in the opening state, the control seat is opened to the front side of the support, the control rod is exposed out of the upper side of the control seat, in the folding state, the control seat is folded to the upper side of the support, and the control rod is located on the lower side of the control seat.

9. A backrest assembly comprising a backrest assembly, further comprising two hand assemblies as claimed in any one of claims 1 to 8 mounted to respective mounting sections of the backrest assembly on either side;

the backrest assembly includes:

a back rest providing the mounting section;

a back cushion providing a back rest surface;

upper and lower two push rods, the back cushion, the two push rods and the backrest frame constituting a third articulated four-bar mechanism, wherein the back cushion and the backrest frame constitute a link and a frame of the third articulated four-bar mechanism, respectively, the two push rods constitute two link rods of the third articulated four-bar mechanism, the back cushion is disposed so as to be switchable from a first position to a second position via an intermediate position with respect to the backrest frame, the back cushion being closer to the front side in the first position than in the second position; and

and a third elastic member having one end connected to one of the two push rods and the other end connected to the back pad, wherein the cushion has a tendency to be shifted from the intermediate position to the first position or the second position by an elastic force of the third elastic member.

10. A wheelchair comprising the backrest assembly of claim 9.