A lifting chair

Abstract

The invention relates to a lifting chair adapted for use with a patient with mobility impairments or a subject who is prone to falling, wherein the lifting chair comprises: a backrest; a seat joined to the backrest; a frame adapted to carry the backrest and the seat; a first vertical actuator, wherein a distal end of the first vertical actuator is attached to the seat or the backrest and an opposed end of the first vertical actuator is attached to the frame, when in use, the first vertical actuator is adapted to motivate the seat in a vertical plane relative to the frame; and wherein the lifting chair further comprises: a first driving actuator disposed at a base of the frame, and wherein the first driving actuator is adapted to motivate the frame in a horizontal plane of the frame, when in use.

Description

A LIFTING CHAIRTECHNICAL FIELD

[0001] The present invention relates to a lifting chair, and more particularly, a lifting chair for use with a patient with a mobility impairment or a subject who is prone to falling.BACKGROUND

[0002] Mobility or lifting devices are used to assist patients or individuals with mobility impairments in moving around and navigating their environments. Mobility or lifting devices enable individuals to move around independently, allowing them to perform daily activities.

[0003] United States of America Patent Application No. US20060213007A1 describes a patient transfer system with associated patient support frames, lift carts, lifts, carts, and other accessories for use therewith. The support frames are designed to: (a) provide rigidity (exoskeleton) to the human body for positioning to provide stability for purposes of transferring, lifting and / or transporting the subject via a mobile device, such as a powered lift device; (b) a male / f emale coupling for coupling to a carriage mechanism of a lifting device thereto to move or lift the subject; and / or (c) be used as a support or frame that will interact with the body as an exoskeleton to aid with the activities of daily living.

[0004] United States of America Patent No. US7472921B2 describes a collapsible self- propelled chair on wheels that is lightweight in construction and easily collapsed, carried, stored and transported by public or private means. The chair performs the function of a wheelchair while avoiding the appearance of a traditional wheelchair. The wheelchair may further include an armrest, a footrest, or a reclining back.

[0005] United States of America Patent No. US7891696B2 describes a foldable wheel chair or mobility base comprising a chair portion and wheeled frame. The chair portion has a back hinged to a seat. The frame supports the chair portion, a spaced pair of frontwheel caster assemblies and a spaced pair of rear wheels. A lower end of the back of the chair portion attaches to the frame via two spaced brackets which are slidably connected to upright curved rear support members such that they can be moved along the curved rear support members to permit adjustment of the chair tilt between predetermined stop positions along the curved rear support members without changing a seat to back angle. The chair portion is connected to the frame via front support members and diagonal struts connected to common pins fastened to each of the front wheel caster assemblies. The other end of each diagonal strut is hinged to one of the spaced brackets.

[0006] Known or conventional mobility or lifting devices primarily serve the purpose of assisting individuals with impaired mobility. However, conventional mobility or lifting devices have several disadvantages including limited functionality and limited ability to assist individuals prone to falling. For example, individuals often require assistance for transferring themselves on and off conventional mobility devices, thereby limiting their level of independence. Further, conventional mobility or lifting devices often include exposed mechanical elements and moving parts, posing a potential safety hazard.

[0007] Further, recent advancements in assistive technology have aimed to enhance user independence. However, many existing solutions still require separate devices for different functions, such as distinct devices for lifting and mobility. This can lead to cluttered living spaces and the need for multiple transfers between devices, potentially increasing the risk of falls or injuries. Moreover, the clinical or institutional appearance of many assistive devices can have a negative psychological impact on users, serving as a constant reminder of their physical limitations. This aesthetic concern is often overlooked in the design of mobility assistance equipment, despite its potential influence on user well-being and home integration.

[0008] Thus, there remains a need to develop a mobility or lifting device that assists patients or subjects with mobility impairments and is easy to transfer on and off, thereby promoting the independence of the patients or subjects.

[0009] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.SUMMARY

[0010] PROBLEMS TO BE SOLVED

[0011] It is an aim and objective of the present invention to provide a lifting chair, more particularly a lifting chair for use with patients with mobility impairments.

[0012] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0013] MEANS FOR SOLVING THE PROBLEM

[0014] In a first aspect of the present invention, there is provided a lifting chair adapted for use with a patient with mobility impairments or a subject who is prone to falling, wherein the lifting chair comprises: a backrest; a seat joined to the backrest; a frame adapted to carry the backrest and the seat; a first vertical actuator, wherein a distal end of the first vertical actuator is attached to the seat or the backrest and an opposed end of the first vertical actuator is attached to the frame, wherein the first vertical actuator is adapted to motivate the seat in a vertical plane relative to the frame, when in use; andwherein the lifting chair further comprises: a first driving actuator disposed at a base of the frame, and wherein the first driving actuator is adapted to motivate the frame in a horizontal plane of the frame, when in use.

[0015] Preferably, the lifting chair further comprises a second vertical actuator, wherein a distal end of the second vertical actuator is attached to the seat or the backrest and an opposed end of the second vertical actuator is attached to the frame, and wherein the second vertical actuator is adapted to motivate the seat in the vertical plane relative to the frame, when in use.

[0016] Preferably, the first vertical actuator is slidably engageable with a first side of the backrest and the second vertical actuator is slidably engageable with a second opposing side of the backrest, and wherein each vertical actuator is adapted to motivate the seat in a vertical plane relative to the frame, when in use.

[0017] Preferably, the lifting chair further comprises a second driving actuator, wherein the first driving actuator is mounted at a first side of the base of the frame, and the second driving actuator is mounted at a second opposing side of the base of the frame, and wherein each driving actuator is adapted to motivate the frame in the horizontal plane of the frame, when in use.

[0018] Preferably, the first driving actuator is adapted to motivate the frame in the horizontal plane of the frame independent of the second driving actuator, when in use.

[0019] Preferably, actuation of the first vertical actuator is adapted to be synchronized with actuation of the second vertical actuator.

[0020] Preferably, the seat is fixed at a predetermined angle relative to the backrest.

[0021] Preferably, the lifting chair further comprises a footrest pivotally secured at a distal end or leading edge of the seat.

[0022] Preferably, the footrest is adapted to be moveable between a retracted configuration and an extended configuration.

[0023] Preferably, the footrest is adapted to form a declining obtuse angle relative to the plane of the seat when the footrest is in a retracted configuration.

[0024] Preferably, the footrest comprises a supporting wheel, wherein the supporting wheel is adapted to engage with a ground surface to facilitate movement of the footrest between the retracted and extended configuration, when in use.

[0025] Preferably, the frame is lightweight.

[0026] Preferably, the frame is substantially enclosed.

[0027] Preferably, a first motor is rotatably coupled to the opposed end of the first vertical actuator such that rotation of the first motor is adapted to actuate the first vertical actuator, when in use.

[0028] Preferably, a second motor is rotatably coupled to the opposed end of the second vertical actuator such that rotation of the second motor is adapted to actuate the second vertical actuator, when in use.

[0029] Preferably, the first driving actuator comprises a first driving motor and a first driving wheel, wherein the first driving motor is rotatably coupled to the first driving wheel such that rotation of the first driving motor is adapted to rotate the first driving wheel, when in use.

[0030] Preferably, the second driving actuator comprises a second driving motor and a second driving wheel, wherein the second driving motor is rotatably coupled to thesecond driving wheel such that rotation of the second driving motor is adapted to rotate the second driving wheel, when in use.

[0031] Preferably, each vertical actuator is adapted to motivate the seat in the vertical plane relative to the frame such that the seat is moveable to a position substantially level to or flush to a ground surface, when in use.

[0032] Preferably, the actuation of each vertical actuator and each driving actuator is remote-controlled.

[0033] Preferably, the first vertical actuator and the second vertical actuator are each oriented at an oblique angle relative to the vertical plane of the lifting chair.

[0034] In the context of the present invention, the words “comprise”, “comprising” and the like are to be construed in their inclusive, as opposed to their exclusive, sense, that is in the sense of “including, but not limited to”.

[0035] The invention is to be interpreted with reference to at least one of the technical problems described or affiliated with the background art. The present invention aims to solve or ameliorate at least one of the technical problems, and this may result in one or more advantageous effects as defined by this specification and described in detail with reference to the preferred embodiments of the present invention.BRIEF DESCRIPTION OF THE FIGURES

[0036] Figure 1 depicts a front perspective view of a preferred embodiment of a lifting chair including a footrest, wherein the footrest is in a retracted configuration.

[0037] Figure 2 depicts a front perspective view of the lifting chair including the footrest, wherein the footrest is in an extended configuration.

[0038] Figure 3 depicts a rear view of the lifting chair including the footrest, wherein the footrest is in an extended configuration.

[0039] Figure 4 depicts a front perspective view of the lifting chair including the footrest, wherein the footrest is in an extended configuration.

[0040] Figure 5 depicts a front perspective view of a preferred embodiment of a lifting chair including a footrest, wherein the footrest is in a retracted configuration.

[0041] Figure 6 depicts a front perspective view of a preferred embodiment of a lifting chair including a footrest, wherein the footrest is in a retracted configuration.DESCRIPTION OF THE INVENTION

[0042] Preferred embodiments of the invention will now be described with reference to the accompanying drawings and non-limiting examples.

[0043] The terms “a” and “an” as used herein means one or more, or at least one.

[0044] The term “about” as used herein in relation to a numerical value means the defined numerical value plus or minus 10%.

[0045] The term “lifting chair” as used herein refers to a chair that may include a lifting mechanism adapted to assist individuals in standing up from a seated position. It is to be appreciated that the term “lifting chair” as used herein may include a mobility chair. The lifting or mobility chair may be adapted to assist individuals with a mobility impairment. For example, the lifting or mobility chair may be useful for assisting individuals with a mobility impairment, wherein the mobility impairment may result in frequent falling of the individual or the inability or difficulty to stand up. It is to be appreciated that the lifting chair as described herein may be useful for individuals with or without mobility impairments but who may also be prone to falls.

[0046] The term “mobility impairment” as used herein refers to a condition that affects an individual’s ability to move. Mobility impairments may vary in severity and may (without limitation) be caused by an injury, illness, congenital conditions, or age-related changes. Non-limiting examples of mobility impairments may include difficulty walking,limited range of motion, balance and coordination impairments or issues, musculoskeletal disorders, amputation, neurological conditions, chronic pain, fatigue, or any combination thereof.

[0047] The terms “patient” and “subject” as used herein refer to a person or human that is intending to use the lifting chair as described herein. Preferably, the patient or subject has a mobility impairment. In some examples, the patient or the subject may be an elderly person, more preferably, an elderly person with a mobility impairment. The terms “patient” and “subject” are used interchangeably throughout this specification unless specified otherwise.

[0048] A first preferred embodiment of the present invention is shown in Figures 1 to 6. Referring to Figure. 1 there is provided a lifting chair 1. The lifting chair 1 may be adapted for use with a patient or a subject with a mobility impairment. Alternately, the lifting chair 1 may be adapted for use with a subject who is prone to falling. The lifting chair 1 comprises a backrest 2, a seat 3 joined to the backrest 2, and a frame 4 adapted to carry the backrest 2 and the seat 3. Preferably, the lifting chair is adapted to be foldable or collapsible. For example, the frame may be adapted to transition between an operational configuration and a compact storage configuration. In this example, the frame may include a plurality of pivotally interconnected structural members, configured to fold in a predetermined sequence. The backrest may be configured to be multi-positional, wherein the backrest is selectively adjustable through a range of angular positions relative to the seat, from a substantially upright orientation to a reclined configuration. The backrest may optionally include articulated segments, allowing for customisable lumbar support and promoting ergonomically optimised postures, when in use. The seat may optionally include a tilt mechanism, allowing for adjustment of the seat angle relative to the horizontal plane. The adjustability of the backrest and the seat enables a wide range of user-specific positioning options.

[0049] Referring to Figure 1, the seat 3 is joined to the backrest 2. The seat 3 extends transversely relative to the backrest 2 to provide or form a substantially horizontal seating surface for the patient or the subject, when in use. Preferably, the seat 3 is fixed at apredetermined angle relative to the backrest 2. It is to be appreciated that the seat 3 may be fixed at any predetermined angle relative to the backrest 2 and that the examples shown and described herein are by way of non-limiting examples only. Preferably, the seat 3 may be fixed at a substantially perpendicular angle relative to the backrest 2. Alternately, the seat 3 may be fixed at an obtuse angle relative to the backrest 2. Preferably the seat 3 may be fixed at an angle of about 95° relative to the backrest 2. The width of the backrest 2 may correspond to the width of the seat 3. The backrest 2 may be joined or connected to the seat 3 using any suitable means, as would be readily understood by persons skilled in the art. By way of a non-limiting example, a lower end or lower portion of the backrest 2 may be mounted, coupled, or attached to the rear end of the seat 3 using any suitable mounting means, coupling means, or attachment means. Alternately, the backrest 2 and the seat 3 may be joined and configured to form a single integrated unit. Preferably, the seat 3 may be adapted to have a length less than the length of the frame 4. Preferably, the seat 3 may be adapted to have a width less than the width of the frame 4 such that the seat 3 is substantially protected or enclosed by the frame 4. Preferably, the backrest 2 may be adapted to have a width less than the width of the frame 4. Preferably, the seat 3 further comprises a seat cushion, wherein the seat cushion is adapted to substantially cover or overlay the seat 3. Preferably, the backrest 2 further comprises a backrest cushion, wherein the backrest cushion is adapted to substantially cover or overlay the backrest 2. Preferably, the seat cushion and the backrest cushion are adapted to form a single integrated cushion that substantially covers the seat 3 and the backrest 2. Alternately, the seat cushion and the backrest cushion may be configured as separate cushion components. The seat cushion and the backrest cushion may each provide cushioned support and enhance comfort for the patient or the subject, when in use. The seat cushion and the backrest cushion may be constructed of any suitable material. Non-limiting examples of suitable materials may include any one or more of:

[0050] Foam: foam cushions may be constructed to have varying densities and thicknesses to accommodate the different needs and preferences of the subject or patient. Foam cushion (such as memory foam) may conform to the patient’s or subject’s body shape for personalized comfort and pressure distribution.

[0051] Gel: gel cushions feature a layer of gel encased within foam or other materials to provide enhanced pressure relief and comfort. Gel cushions distribute pressure evenly across the seat and / or backrest surface, thereby increasing comfort.

[0052] Air (cushion): Air cushions comprise multiple air cells or chambers that may be adjusted to customize the level of support and pressure relief. The air cushion may be inflated or deflated to achieve the desired firmness and positioning.

[0053] Hybrid materials: Hybrid cushions combine multiple materials, such as foam, gel, and / or air, to provide a balance of comfort, support, and pressure relief.

[0054] Viscoelastic Polyurethane: Viscoelastic polyurethane or memory foam, moulds to the shape of the patient’s or subject’s body in response to heat and pressure. Such cushions provide excellent pressure redistribution and support, thereby enhancing comfort.

[0055] The backrest optionally comprises a contoured rigid frame housing a plurality of massage modules. The plurality of massage modules includes a plurality of motorised rollers, vibration motors and air compression elements that are, together, arranged in a matrix configuration. In this embodiment, the plurality of massage modules are encapsulated within a multi-layered padding system including a flexible protective inner layer, memory foam for enhancing user comfort, and high-density foam for shape retention. A massage control module is integrated within the backrest for operably controlling the plurality of massage modules.

[0056] Still referring to Figure 1, the frame 4 is configured and adapted to provide dimensional stability for the seat 3 and the backrest 2. Preferably, the frame 4 is configured and adapted to provide a stable frame or a supporting lifting frame for the seat 3 and the backrest 2. Referring to Figure 1, the frame 4 comprises a plurality of boxshaped girders that, together, are configured to provide a stable lifting frame for the seat 3 and the backrest 2. The box-shaped girders may be constructed of any suitable material. Non-limiting examples of suitable materials may include any one or more of wood,tubing, metal (such as steel, aluminium, or any other suitable material), or any other suitable material as could be readily determined by persons skilled in the art. The plurality of box-shaped girders are configured to provide a base 5, a first side frame 6, an opposing second side frame 7, and a back frame 8. The first side frame 6, the second opposing side frame 7, and the back frame 8 are mounted to the base 5 to provide a substantially box-shaped or rectangular frame. However, it is to be appreciated that the frame may be configured to be any suitable shape to provide a dimensional stability and / or a stable lifting frame for the seat 3 and the backrest 2, and that the examples shown and described herein are by way of non-limiting examples only. For example, the frame 4 may be configured in a substantially curved or semi-circular shape. It is to be appreciated that the first side frame 6, the second opposing side frame 7, and the back frame 8 may be configured as separate components, wherein the separate components are together configured to form any desired frame shape. Alternately, the first side frame 6, the second opposing side frame 7, and the back frame 8 may form one or more integrated components, wherein the one or more integrated components are configured to form any desired frame shape. Preferably, the first side frame 6 may be adapted to provide a first outer armrest, and the second opposing side frame may be adapted to provide a second outer armrest. A front edge of each side frame may form a substantially rectangular front corner edge. Alternately, the front edge of each side frame may be rounded to provide a curved front edge. The curved front edge of each side frame may provide ergonomic support and promote comfortable arm positioning for the patient or the subject, when the lifting chair 1 is in use.

[0057] The first outer armrest and / or the second outer armrest optionally includes an integrated cup holder. For example, the integrated cup holder may comprise a recessed circular compartment lined with a moisture-resistant material. Preferably, the integrated cup holder forms a tapered cylinder having a diameter between about 5cm to about 15cm, more preferably about 7cm to about 12cm, and a depth of between about 5cm to about 10cm. The integrated cup holder is adapted to securely accommodate various beverage container sizes, thereby enhancing user convenience and reducing the risk of spills during operation and repositioning of the lifting chair.

[0058] Referring to Figure 2, the lifting chair 1 further comprises a first vertical actuator 9. A distal end 9A of the first vertical actuator 9 is attached to the seat 3 or the backrest 2. It is to be appreciated that the first distal end 9A of the first vertical actuator 9 may include any portion of the first vertical actuator positioned adjacent to the seat 3 or the backrest 2. The distal end 9A of the first vertical actuator 9 may be directly or indirectly attached to the seat 3 or the backrest 2. An opposed end 9B of the first vertical actuator 9 is attached to the frame 4. It is to be appreciated that the opposed end of the first vertical actuator may include any opposed portion of the first vertical actuator positioned adjacent to the frame or a portion of the frame thereof. The opposed end 9B of the first vertical actuator 9 may be directly or indirectly attached to the frame 4. Preferably, the opposed end 9B of the first vertical actuator 9 is attached to a first side 5A of the base 5 of the frame 4. In an alternate embodiment (not shown), the distal end 9A of the first vertical actuator 9 may be attached to a rear face 2A of the backrest 2, and the opposed end 9B of the first vertical actuator 9 may be attached to the base 5 of the frame 4. When in use, the first vertical actuator 9 is adapted to motivate the seat 3 in a vertical plane relative to the frame 4. Preferably, the first vertical actuator 9 is adapted to motivate the seat 3 and the backrest 2 in a vertical plane relative to the frame 4, when in use. Preferably, the first vertical actuator 9 is oriented at an oblique angle relative to the vertical plane, such that its line of action forms an acute angle with respect to the base 5, thereby enabling the seat 3 to traverse an arcuate path during vertical displacement. This angled configuration advantageously shifts the user's center of gravity in a controlled manner during lifting operations, enhancing stability and facilitating easier ingress and egress from the lifting chair, when in use.

[0059] Still referring to Figure 2, the first vertical actuator 9 may include a first vertical support 10, wherein the first vertical support 10 is supported by the frame 4. A lower end of the first vertical support 10 may be directly or indirectly coupled to the base 5 of the frame 4, and an upper end of the first vertical support 10 may be directly or indirectly coupled to the adjacent first side frame 6. The first vertical support 10 includes a first guide rail (not shown), wherein the first guide rail extends substantially the length of the first vertical support 10. The first vertical actuator 9 further includes a first carriage (notshown) adapted to support the backrest 2. The first carriage is adapted to be slidably engageable with the first guide rail such that, in use, the first carriage is slidable about the length of the first guide rail to motivate the backrest 2 and the seat 3 in a vertical plane relative to the frame 4. Preferably, the first vertical actuator 9 further includes a first bearing mounted to the first carriage, wherein the first bearing is adapted to slidably engage with the first guide rail, when in use. It is to be appreciated that the first vertical actuator 9 may include a plurality of first bearings, wherein each first bearing is adapted to slidably engage with the first guide rail, when in use. In the embodiment shown in Figure 2, the first guide rail substantially extends the length of the first vertical support 10 such that the first carriage is slidable along the length of the first vertical support to a position substantially level to a ground surface. In use, this configuration advantageously allows the seat 3 to be motivated in a vertical plane relative to the frame 4 to a position such that the seat 3 is moveable to a position substantially level to or flush to a ground surface, when in use.

[0060] In a preferred embodiment, the first vertical actuator 9 may further include a first worm gear system (not shown). The first worm gear system includes a first worm gear mounted at a predetermined position within the first vertical actuator 9. A first input shaft is rotatably coupled to the first worm gear such that rotation of the first input shaft facilitates corresponding rotation of the first worm gear, when in use. Preferably, the first worm gear is mounted at a fixed position relative to the first guide rail. The first worm gear system further includes a first worm wheel, wherein the first worm wheel is rotatably engageable with the first worm gear such that rotation of the first worm gear facilitates complementary rotation of the first worm wheel. A first output shaft is rotatably coupled to the first worm wheel such that rotation of the first worm wheel facilitates corresponding rotation of the first output shaft. By way of a non-limiting example, the first output shaft may be configured as a first threaded output shaft. The first threaded output shaft may be adapted to extend substantially the length of the first guide rail. A first threaded nut may be mounted to the first carriage, wherein the first threaded nut is adapted to be threadably engageable with the first threaded output shaft. In use, the first input shaft is rotated to facilitate corresponding rotation of the first worm gearwhich, in turn, facilitates rotation of the first worm wheel. Rotation of the first worm wheel drives corresponding rotation of the first threaded output shaft coupled thereto, thereby causing the first threaded nut and the first carriage mounted thereto to directionally move about the length of the first guide rail which, in turn, motivates the backrest 2 and the seat 3 in a vertical plane relative to the frame 4.

[0061] In a preferred embodiment (not shown), a first motor may be rotatably coupled to the opposed end of the first vertical actuator such that rotation of the first motor facilitates actuation of the first vertical actuator, when in use. By way of a non-limiting example, the first motor may be rotatably coupled to the first worm gear such that rotation of the first motor facilitates rotation of the first worm gear. In this example, the first input shaft may be rotatably coupled to the first motor such that rotation of the first motor facilitates the corresponding rotation of the first input shaft coupled thereto, thereby causing the corresponding rotation of the first worm gear. It is to be appreciated that the first motor may be adapted to be positioned at any suitable position. Preferably, the first motor may be adapted to be positioned at the base of the frame. More preferably, the first motor may be adapted to be positioned adjacent to the rear face of the backrest and the base of the frame.

[0062] In an alternate embodiment, the first vertical actuator may include a first lead screw mechanism, wherein the first lead screw mechanism facilitates the sliding engagement of the first carriage along the first guide rails of the first vertical actuator. By way of a non-limiting example, a first threaded rod may be rotatably coupled to the first motor such that rotation of the first motor facilitates rotation of the first threaded rod. In this example, the first threaded nut is mounted to the first carriage and the first threaded nut is adapted to be threadably engageable with the first threaded rod. In use, rotation of the first motor facilitates the rotation of the first threaded rod. Rotation of the first threaded rod facilitates rotation of the first threaded nut about the longitudinal axis of the first threaded rod, thereby causing the first threaded nut and the first carriage mounted thereto to directionally move along the longitudinal axis of the first guide rail which, in turn, motivates the backrest and the seat in a vertical plane relative to the frame.

[0063] Still referring to Figure 2, the lifting chair 1 further comprises a second vertical actuator 12. A distal end 12A of the second vertical actuator 12 is attached to the seat 3 or the backrest 2. It is to be appreciated that the distal end 12A of the second vertical actuator 12 may include any portion of the second vertical actuator 12 positioned adjacent to the seat 3 or the backrest 2. The distal end 12A of the second vertical actuator 12 may be directly or indirectly attached to the seat 3 or the backrest 2. An opposed end 12B of the second vertical actuator 12 is attached to the second opposing side 7 of the frame 4. It is to be appreciated that the opposed end 12B of the second vertical actuator 12 may include any opposed portion of the second vertical actuator 12 positioned adjacent to the second opposing side 7 of the frame 4 or a portion of the frame thereof. The opposed end 12B of the second vertical actuator 12 may be directly or indirectly attached to the frame 4. Preferably, the opposed end 12B of the second vertical actuator 12 is attached to a second diametrically opposed second side 5B of the base 5 of the frame 4. When in use, the second vertical actuator 12 is adapted to motivate the seat 3 in a vertical plane relative to the frame 4. Preferably, the second vertical actuator 12 is adapted to motivate the seat 3 and the backrest 2 in a vertical plane relative to the frame 4, when in use. Preferably, the second vertical actuator is oriented at an oblique angle relative to the vertical plane, such that its line of action forms an acute angle with respect to the base 5.

[0064] Still referring to Figure 2, the second vertical actuator 12 may include a second vertical support 13, wherein the second vertical support 13 is supported by the frame 4. A lower end 13A of the second vertical support 13 may be directly or indirectly coupled to the base 5 of the frame 4, and an upper end 13B of the second vertical support 13 may be directly or indirectly coupled to the adjacent second opposing side frame 7, wherein the second opposing side frame 7 diametrically opposes the first side frame 6. The second vertical support 13 includes a second guide rail, wherein the second guide rail extends substantially the length of the second vertical support 13. The second vertical actuator 12 further includes a second carriage (not shown) adapted to support the backrest 2. The second carriage is adapted to be slidably engageable with the second guide rail such that, in use, the second carriage is slidable about the length of the second guide rail to motivate the backrest 2 and the seat 3 in a vertical plane relative to the frame 4. Preferably, thesecond vertical actuator 12 further includes a second bearing mounted to the second carriage, wherein the second bearing is adapted to slidably engage with the second guide rail, when in use. It is to be appreciated that the second vertical actuator 12 may include a plurality of second bearings, wherein each second bearing is adapted to slidably engage with the second guide rail, when in use. Preferably, the second guide rail substantially extends the length of the second vertical support 13 such that the second carriage is slidable along the length of the second vertical support 13 to a position substantially level with a ground surface. In use, this configuration advantageously allows the seat 3 to be motivated in a vertical plane relative to the frame 4 to a position such that the seat 3 is moveable to a position substantially level to or flush to a ground surface, when in use.

[0065] In a preferred embodiment, the second vertical actuator 12 may further include a second worm gear system (not shown). The second worm gear system includes a second worm gear mounted at a predetermined position within the second vertical actuator 12. A second input shaft is rotatably coupled to the second worm gear such that rotation of the second input shaft facilitates corresponding rotation of the second worm gear, when in use. Preferably, the second worm gear is mounted at a fixed position relative to the second guide rail. The second worm gear system further includes a second worm wheel, wherein the second worm wheel is rotatably engageable with the second worm gear such that rotation of the second worm gear facilitates complementary rotation of the second worm wheel. A second output shaft is rotatably coupled to the second worm wheel such that rotation of the second worm wheel facilitates corresponding rotation of the second output shaft. By way of a non-limiting example, the second output shaft may be configured as a second threaded output shaft. The second threaded output shaft may be adapted to extend substantially the length of the second guide rail. A second threaded nut may be mounted to the second carriage, wherein the second threaded nut is adapted to be threadably engageable with the second threaded output shaft. In use, the second input shaft is rotated to facilitate corresponding rotation of the second worm gear which, in turn, facilitates rotation of the second worm wheel. Rotation of the second worm wheel drives corresponding rotation of the second threaded output shaft coupled thereto, thereby causing the second threaded nut and the second carriage mounted thereto to directionallymove about the length of the second guide rail which, in turn, motivates the backrest 2 and the seat 3 in a vertical plane relative to the frame 4.

[0066] In a preferred embodiment (not shown), a second motor may be rotatably coupled to the opposed end of the second vertical actuator such that rotation of the second motor facilitates actuation of the second vertical actuator, when in use. By way of a non-limiting example, the second motor may be rotatably coupled to the second worm gear such that rotation of the second motor facilitates rotation of the second worm gear. In this example, the second input shaft may be rotatably coupled to the second motor such that rotation of the second motor facilitates the corresponding rotation of the second input shaft coupled thereto, thereby causing the corresponding rotation of the second worm gear. It is to be appreciated that the second motor may be adapted to be positioned at any suitable position. Preferably, the second motor may be adapted to be positioned at the base of the frame. More preferably, the second motor may be adapted to be positioned adjacent to the rear side of the backrest 2 and the base of the frame, and adjacent to the first motor.

[0067] In an alternate embodiment, the second vertical actuator may include a second lead screw mechanism, wherein the second lead screw mechanism facilitates the sliding engagement of the second carriage along the second guide rails of the second vertical actuator. By way of a non-limiting example, a second threaded rod may be rotatably coupled to the second motor such that rotation of the second motor facilitates rotation of the second threaded rod. In this example, the second threaded nut is mounted to the second carriage and the second threaded nut is adapted to be threadably engageable with the second threaded rod. In use, rotation of the second motor facilitates the rotation of the second threaded rod. Rotation of the second threaded rod facilitates rotation of the second threaded nut about the longitudinal axis of the second threaded rod, thereby causing the second threaded nut and the second carriage mounted thereto to directionally move along the longitudinal axis of the second guide rail which, in turn, motivates the backrest and the seat in a vertical plane relative to the frame.

[0068] It is to be appreciated that each vertical actuator 9, 12 may include any suitable drive mechanism to facilitate directional movement of each respective carriage about thelength of each respective guide rail, and that the examples shown and described herein are by way of non-limiting examples only. For example, persons skilled in the art could readily construct the first vertical actuator and / or the second vertical actuator to include any suitable drive mechanism using their common general knowledge and without the need for further invention. Non-limiting examples of suitable drive mechanisms may include a worm-gear system, a lead-screw assembly, a rack-and-pinion assembly, a ballscrew assembly, a hydraulic or pneumatic actuator, or any other suitable drive mechanism well-known in the art.

[0069] Preferably, the actuation of the first vertical actuator is adapted to be synchronized with the actuation of the second vertical actuator. Synchronizing the actuation of the first vertical actuator and the second vertical actuator may advantageously achieve a smooth and coordinated motivation of the seat, when in use.

[0070] Preferably, the seat is adapted to be motivated between at least two predetermined positions, more preferably at least three predetermined positions. In a first predetermined position, the seat is adapted to be in a seated position. In the first predetermined position, the seat may be motivated or adapted to have a height of between about 0.3m to about 1.2m relative to a ground surface, more preferably between about 0.5m to about Im relative to a ground surface, more preferably between about 0.6m to about 0.8m relative to a ground surface, more preferably between about 0.65m to about 0.75m relative to a ground surface. In a second predetermined position, the seat is adapted to be in a loading position such that the seat has a height of less than about 0.6m relative to a ground surface, more preferably less than about 0.4m relative to a ground surface, more preferably less than about 0.35m relative to a ground surface. More preferably, in the loading position, the seat is adapted to be substantially level to a ground surface. Thus, in the second predetermined position, the relative distance between the seat and the ground surface is minimal or zero thereby enabling the patient or the subject to easily and independently move or transfer onto the seat of the lifting chair. In a third predetermined position, the seat is adapted to facilitate a standing position of the user, when in use. In this position, the seat may be motivated or adapted to have a height of between about0.8m to about 1.5m relative to a ground surface, more preferably between about 0.9m to about 1.3m relative to a ground surface. The third predetermined position allows the seat to be elevated to a height that facilitates the transition of a user from a seated position to a standing posture. In the third predetermined position, the seat may be adapted to fold or be angled relative to its horizontal orientation, creating an inclined surface that can help guide and support the user's body as they move towards a standing position. The angle of the seat in the third predetermined position may be adjustable, allowing for customisation based on user preferences or physical needs. Embodiments wherein the seat is adapted to fold or angle may provide additional support to the user's thighs and lower back during the standing process when in use, potentially reducing strain and increasing stability as the user rises to a full upright stance. It is to be appreciated that each predetermined position comprises a range of adjustable seat angles within the respective predetermined position. Specifically, the first predetermined position, the second predetermined position, and the third predetermined position each include a subset of seat angles that can be adjusted within each respective predetermined position(s) operational range. For example, when the lifting chair is in the first predetermined position (seated position), the seat angle may be adjustable within a defined range specific to the first predetermined position. Further, the second predetermined position (loading position) and the third predetermined position (standing position) each allow for seat angle adjustments within their respective predetermined positional constraints. Such configurations enable customisable seat orientation within each respective predetermined position, thereby enhancing user comfort and operational functionality of the lifting chair. It is to be appreciated that the seat 3 is moveable between a plurality of intermediary positions between the first predetermined position, the second predetermined position, and the third predetermined position.

[0071] Referring to Figure 3, the lifting chair 1 further comprises a first driving actuator 15. The first driving actuator 15 is disposed or mounted at the base 5 of the frame 4. In use, the first driving actuator 15 is adapted to motivate the frame 4 in a horizontal plane of the frame 4. The first driving actuator may comprise a first driving motor and a first driving means, wherein the first driving motor may be rotatably coupled to the firstdriving means such that rotation of the first driving motor facilitates rotation of the first driving means, when in use.

[0072] In the embodiment shown in Figure 3, the first driving actuator 15 is disposed or mounted at or adjacent to the first side 5A of the base 5 of the frame 4. Preferably, the first driving actuator 15 is disposed or mounted at or adjacent to the first side 5 A of the base 5 of the frame 4 at a position corresponding to the centre of gravity of the respective first side frame 6 of the lifting chair 1. Such positioning may assist with the centre of gravity of the lifting chair, enhance the overall stability and manoeuvrability of the lifting chair 1, when in use. More preferably, the first driving means is positioned adjacent to the first side of the base of the frame (such as at a rear position of the base of the frame), and the first driving means is positioned at the first side of the frame. It is to be appreciated that the first driving actuator (and its components thereof) may be positioned in a variety of suitable ways relative to the base of the frame, and that the embodiments shown and described herein are by way of non-limiting examples only. Referring to Figure 3, the first driving actuator 15 may be substantially or partially enclosed by the base of the frame 4. Embodiments wherein the first driving actuator 15 is substantially or partially enclosed by the base 5 of the frame 4 may reduce the risk of damage to the first driving actuator 15 and further may reduce the risk of the patient or the subject injuring themselves by colliding with the first driving actuator.

[0073] In a preferred embodiment, the first driving actuator comprises a first driving wheel. Preferably, the first driving wheel is configured to have a diameter of between about 150mm to about 250mm, more preferably about 200mm. By way of a non-limiting example, the first driving wheel may include a first hub positioned at the centre of the first driving wheel (not shown). The first driving wheel may further include a first axle extending through the first hub, wherein the first axle is mounted or coupled to the first side of the base of the frame. A first driving motor may be rotatably coupled to the first hub such that activation of the motor facilitates rotation of the first hub, thereby causing corresponding rotation of the first driving wheel. It is to be appreciated that the first driving motor may be integrated into the first hub of the first driving motor. In analternate non-limiting example, the first driving motor may include a first motor shaft, wherein the first motor shaft is rotatably coupled to the first hub of the first driving motor. In this example, activation of the first driving motor facilitates rotation of the first motor shaft, thereby causing rotation of the first hub rotatably coupled thereto which, in turn, motivates the frame in a horizontal plane of the frame, when in use. In yet another alternate non-limiting example, the first driving actuator may include a first belt drive system. In this example, a first drive pulley is rotatably coupled to the first motor shaft of the first motor such that rotation of the first motor facilitates rotation of the first drive pulley. The first belt drive system further includes a first belt, wherein the first belt is configured to loop around the first drive pulley and the first driving wheel to form a continuous loop. In use, the first motor is activated to facilitate the rotation of the first drive pulley, thereby causing movement of the first belt about the first drive pulley which, in turn, facilitates the rotation of the first driving wheel in connection thereto.

[0074] Still referring to Figure 3, the lifting chair 1 further comprises a second driving actuator 16. The second driving actuator 16 is disposed or mounted at the base 5 of the frame 4. In use, the second driving actuator 16 is adapted to motivate the frame 4 in a horizontal plane of the frame 4. The second driving actuator may comprise a second driving motor, wherein the second driving motor may be rotatably coupled to a second driving means such that rotation of the second driving motor facilitates rotation of the second driving means, when in use (not shown). More preferably, the second driving means is positioned adjacent to the second side of the base of the frame (such as at a rear position of the base of the frame), and the second driving means is positioned at the second side of the frame. It is to be appreciated that the second driving actuator (and its components thereof) may be positioned in a variety of suitable ways relative to the base of the frame, and that the embodiments shown and described herein are by way of nonlimiting examples only. Preferably, the first driving actuator 15 is adapted to motivate the frame in the horizontal plane of the frame independent of the second driving actuator 16, when in use. Embodiments wherein the actuation of the first driving actuator 15 is independent of the actuation of the second driving actuator 16 advantageously allows fordirectional control of the lifting chair 1 relative to the horizontal plane of the frame 4, when in use.

[0075] In the embodiment shown in Figure 3, the second driving actuator 16 is disposed or mounted at or adjacent to the second diametrically opposed side 7 of the base 5 of the frame 4. Preferably, the second driving actuator 16 is disposed or mounted at or adjacent to the second opposing side 5B of the base 5 of the frame 4 at a position corresponding to the centre of gravity of the respective second opposing side frame 7. Such positioning may enhance the overall stability and manoeuvrability of the lifting chair 1 , when in use. Referring to Figure 3, the second driving actuator 16 may be substantially or partially enclosed by the base 5 of the frame 4. Embodiments wherein the second driving actuator 16 is substantially or partially enclosed by the base of the frame 4 may reduce the risk of damage to the second driving actuator 16, and further may reduce the risk of the patient or the subject injuring themselves by colliding with the second driving actuator 16.

[0076] In a preferred embodiment (not shown), the second driving actuator comprises a second driving wheel. Preferably, the second driving wheel is configured to have a diameter of between about 150mm to about 250mm, more preferably about 200mm. The second driving wheel includes a first hub positioned at the centre of the second driving wheel. The second driving wheel further includes a second axle extending through the second hub, wherein the second axle is mounted or coupled to the second diametrically opposed side of the base of the frame. A second driving motor is rotatably coupled to the second hub such that activation of the second motor facilitates rotation of the second hub, thereby causing corresponding rotation of the second driving wheel. It is to be appreciated that the second driving motor may be integrated into the second hub of the second driving motor. Alternately, the second driving motor may include a second motor shaft, wherein the second motor shaft is rotatably coupled to the second hub of the second driving motor. In this embodiment, activation of the second driving motor facilitates rotation of the second motor shaft, thereby causing rotation of the second hub rotatably coupled thereto which, in turn, frame in a horizontal plane of the frame, when in use. In yet another alternate non-limiting example, the second driving actuator may include asecond belt drive system. In this example, a second drive pulley is rotatably coupled to the second motor shaft of the second motor such that rotation of the second motor facilitates rotation of the second drive pulley. The second belt drive system further includes a second belt, wherein the second belt is configured to loop around the second drive pulley and the second driving wheel to form a continuous loop. In use, the second motor is activated to facilitate the rotation of the second drive pulley, thereby causing movement of the second belt about the second drive pulley which, in turn, facilitates the rotation of the second driving wheel in connection thereto.

[0077] Each driving wheel or an outer surface of each respective driving wheel thereof may be made from any suitable material. Preferably, each driving wheel, or the outer surface of each respective driving wheel thereof, is constructed or made from one or more materials that are highly durable, shock absorbent, resistant to wear and tear, or any combination thereof. Non-limiting examples of suitable materials may include any one or more of:

[0078] Polyurethane: Driving wheels made from (or comprising an outer surface made from) polyurethane are highly durable, shock absorbent and resistant to wear and tear. Such driving wheels provide good traction on smooth surfaces and are suitable for indoor and outdoor use.

[0079] Solid rubber: Driving wheels made from (or comprising an outer surface made from) solid rubber are highly durable and low maintance, making them suitable for everyday use. Such driving wheels provide good traction on a variety of surfaces and are resistant to punctures and damage.

[0080] Pneumatic (air-filled): Pneumatic driving wheels feature a rubber tyre filled with air, providing excellent shock absorption and cushioning.

[0081] Nylon: Driving wheels made from (or comprising an outer surface made from) nylon are lightweight and offer high load-bearing capacity and durability.

[0082] Polypropylene: Driving wheels made from (or comprising an outer surface made from) polypropylene are lightweight, impact-resistant and corrosion-resistant, making them suitable for both indoor and outdoor use.

[0083] Aluminium or stainless steel: driving wheels made from (or comprising an outer surface made from) aluminium or stainless steel are lightweight, offer good strength-to- weight ratio, and provide desirable maneuverability.

[0084] Preferably, the lifting chair 1 further comprises a plurality of caster wheels (not shown), wherein each caster wheel is mounted to the base 5 of the frame 4. Preferably, each caster wheel is an omni wheel. Persons skilled in the art would readily understand that each omni wheel may be configured to circumferentially comprise small discs or rollers positioned perpendicular to the turning direction of each omni wheel, such that each omni wheel may be driven whilst being capable of sliding laterally relative to the horizontal ground surface, when in use. A first caster wheel is mounted to the first side 5A of the base 5 of the frame 4 at a position adjacent to the first driving wheel of the first driving actuator 15, and a second caster wheel is mounted to the second opposing side 5B of the base 5 of the frame 4 at a position adjacent to the second driving wheel of the second driving actuator 16. A third caster wheel may be mounted to the first side 5 A of the base 5 of the frame 4, wherein the first caster wheel and the third caster wheel are each positioned at opposing sides of the first driving wheel of the first driving actuator15. A fourth caster wheel may be mounted to the second opposing side 5B of the base 5 of the frame 4, wherein the second caster wheel and the fourth caster wheel are each positioned at opposing sides of the second driving wheel of the second driving actuator16. It is to be appreciated that the lifting chair 1 may comprise any number of caster wheels and that the examples shown and described herein are by way of non-limiting examples only. The plurality of caster wheels may enhance the maneuverability, stability and control of the lifting chair 1 described herein. The plurality of caster wheels may be constructed of any suitable material, as could be readily determined by persons skilled in the art. Non-limiting examples of suitable materials may include any one or more ofrubber, polyurethane, nylon, steel, polypropylene, pneumatic (air-filled), thermoplastic rubber, cast iron, or any other suitable material.

[0085] In yet a further non-limiting example, each driving actuator includes a primary drive system comprising a dual-sided configuration, wherein each side includes a tripartite wheel arrangement. Preferably, each tripartite wheel arrangement comprises a primary driving wheel that is centrally positioned and flanked by an omnidirectional caster wheel at a front and rear position. In this example, each primary driving wheel is preferably between about 150mm to about 250mm in diameter and is operatively coupled to a motor via a belt drive system. Each belt drive system comprises a first drive pulley affixed to a motor shaft, a second driven pulley integrated with a wheel hub, and a timing belt connecting the first drive pulley and the second driven pulley. In use and upon motor activation, rotational force is transmitted through each belt drive system, effecting rotation of each respective primary drive wheel.

[0086] The omnidirectional caster wheels, preferably positioned in line with the primary driving wheel provide several advantages and functions. Preferably, the omnidirectional caster wheels are mounted at a position higher than the primary driving wheel, creating a tripod-like support structure for enhanced stability on uneven surfaces. The omnidirectional caster wheels form perpendicular rollers, facilitating smooth lateral movement during turns, and improving manoeuvrability in confined spaces during use. Further, the omnidirectional caster wheels provide additional ground contact points during use, thereby distributing the weight of the lifting chair more evenly, potentially reducing wear on the primary driving wheels and enhancing structural longevity.

[0087] In this example, the tripartite wheel arrangement, which combines the primary driving wheel with passive omnidirectional caster wheels, creates a highly manoeuvrable and stable mobility system. More particularly, such an arrangement allows the lifting chair to execute precise movements during use and in various environments while maintaining a stable platform for the user, thereby enhancing both functionality and safety.

[0088] Referring to Figures 4 to 6, the lifting chair 1 may further comprise a footrest 18, wherein the footrest 18 is adapted to support a lower body portion of the patient or the subject, when in use. The footrest 18 is pivotally secured at a distal end or leading edge 3 A of the seat 3. The footrest 18 may be adapted to be moveable between a first retracted configuration and a second extended configuration. In the first retracted configuration, the footrest 18 is adapted to form a declining obtuse angle relative to the plane of the seat 3, and in the second extended configuration, the footrest 18 is adapted to be substantially parallel and substantially level to a ground surface. Preferably, the obtuse angle of the footrest relative to the plane of the seat is configured to be between about 120° to about 91°, more preferably between about 115° to about 95°, more preferably between about 110° to about 100°. Preferably, the footrest is adapted to be in the first retracted configuration when the seat is in the first predetermined position, and the footrest is adapted to be in the second extended configuration when the seat is in the second predetermined position.

[0089] Still referring to Figure 4, a proximal end 18A of the footrest 18 is pivotally connected to the leading edge 3 A of the seat 3 via a spring hinge 19, thereby allowing the footrest 18 to pivot relative to the horizontal plane of the seat 3. A distal end 18B of the footrest 18 is adapted to contact or engage a ground surface. The distal end 18B of the footrest 18 optionally comprises a first supporting wheel 20, wherein the first supporting wheel 20 is adapted to contact or engage the ground surface, when in use. The first supporting wheel 20 may be coupled at any suitable position across the width of the distal end of the footrest 18. The distal end 18B of the footrest 18 optionally further comprises a second supporting wheel 21, wherein the second supporting wheel 21 is adapted to contact the ground surface, when in use. Preferably, the first supporting wheel 20 is coupled to a first side edge at the distal end of the footrest 18, and the second supporting wheel 21 is coupled to a second opposing side edge at the distal end of the footrest 18. Preferably, each supporting wheel 20, 21 is a supporting caster wheel. Each supporting wheel 20, 21 is adapted to rollably engage with the ground surface to facilitate movementof the footrest 18 between the first retracted configuration and the second extended configuration, when in use.

[0090] In use, the seat 3 downwardly motivates relative to the vertical plane of the frame 4, thereby causing the spring hinge to pivot horizontally relative to the plane of the seat 3. As the spring hinge 19 pivots, each supporting wheel 20, 21 rollably engages with the ground surface, thereby causing the footrest 18 to outwardly extend at a rate consistent with the rate of downward motivation of the seat 3. It is to be appreciated that the footrest 18 is moveable between a plurality of intermediary positions between the first retracted configuration and the second extended configuration.

[0091] Preferably, the footrest 18 further comprises a footrest cushion configured to substantially cover or overlay the footrest. Preferably, the footrest cushion is joined or integrated with the seat cushion such that the pivot connection between the footrest and the leading edge of the seat 3 is substantially covered. It is to be appreciated that the footrest cushion may be made from any suitable material. Non-limiting examples of suitable materials may include any one or more of:

[0092] Foam: foam cushions may be constructed to have varying densities and thicknesses to accommodate the different needs and preferences of the subject or patient. Foam cushion (such as memory foam) may conform to the patient’s or subject’s body shape for personalised comfort and pressure distribution.

[0093] Gel: gel cushions feature a layer of gel encased within foam or other materials to provide enhanced pressure relief and comfort. Gel cushions distribute pressure evenly across the footrest surface, thereby increasing comfort.

[0094] Air (cushion): Air cushions comprise multiple air cells or chambers that may be adjusted to customise the level of support and pressure relief. The air cushion may be inflated or deflated to achieve the desired firmness and positioning.

[0095] Hybrid materials: Hybrid cushions combine multiple materials, such as foam, gel, and / or air, to provide a balance of comfort, support, and pressure relief.

[0096] Viscoelastic Polyurethane: Viscoelastic polyurethane or memory foam, moulds to the shape of the patient’s or subject’s lower body in response to heat and pressure. Such cushions provide excellent pressure redistribution and support, thereby enhancing comfort.

[0097] Preferably, the distal end of the footrest is adapted to form a continuous surface with the ground surface, when the footrest is in an extended configuration. For example, in this embodiment, a planar lower surface of the footrest is dimensioned and configured such that, when in an extended configuration, a distal edge of the footrest is positioned in close proximity to the ground surface, preferably with a clearance gap of less than about 7mm, more preferably less than about 5mm. Such a dimensional relationship between the ground surface and the distal edge of the footrest ensures the formation of a substantially continuous surface between the footrest and the ground surface, when in an extended configuration. Such configuration provides several advantages. For example, such configuration enhances user safety by reducing the risk of tripping or catching objects during movement on and off the lifting chair. Further, such configuration improves accessibility and stability. More particularly, the continuous surface facilitates ease of transfer for users with limited mobility allowing for a smoother transition.

[0098] In a preferred embodiment (not shown), the lifting chair 1 may further comprise a battery. The battery is configured to be in electrical communication with each driving actuator. For example, the battery may be configured to be in electrical communication with each driving motor to control the rotational movement of each driving actuator. The battery may further be configured to be in electrical communication with each vertical actuator. For example, the battery may be configured to be in electrical communication with each motor to control actuation of each vertical actuator. It is to be appreciated that the lifting chair 1 may include a plurality of batteries. For example, a first battery is configured to be in electrical communication with each driving actuator, and a second battery is configured to be in electrical communication with each vertical actuator.Preferably, the battery is disposed or mounted at the base of the frame at a position adjacent the rear face of the backrest 2. Such positioning may balance the centre of gravity of the lifting chair 1 , when in use.

[0099] In a preferred embodiment (not shown), the lifting chair 1 may further include a charging port for charging the battery of the lifting chair. The charging port may be configured to be a standard USB charger or may be configured to be a more advanced charger depending on the voltage of the battery.

[0100] Preferably, the battery is a rechargeable battery for portable operation. The rechargeable battery may be configured in any suitable way as could be readily determined by the person skilled in the art. For example, the rechargeable battery may be configured as a high-capacity lithium-ion battery pack. Preferably, the rechargeable battery is electrically coupled to a battery management system, wherein the battery management system is adapted to control and monitor various parameters of the rechargeable battery. For example, the battery management system is adapted to monitor charge levels, regulate temperature, and control the voltage of the rechargeable battery. Preferably, the lifting chair further comprises a homing system. Preferably, the homing system is in electrical communication with the battery management system and is adapted to activate when the battery charge of the rechargeable battery falls below a predetermined threshold. The homing system comprises a plurality of localisation sensors including infrared (IR) receivers for detecting coded signals from IR beacons on a charging station, an RFID reader for detecting a tag positioned at or near the charging station, and a wheel encoder for odometry-based position estimation; a plurality of navigation sensors including a ultrasonic sensor for obstacle detection, an optical flow sensor for direction and speed tracking; a docketing mechanism including a spring-loaded electrical connectors adapted to align with the charging station, and an alignment pin for engaging with a complementary socket on the charging station; and a control unit comprising a microprocessor for managing sensor data fusion, path planning, and motor control. In use, the homing system is adapted to activate when the battery management system detects that the battery charge is below a predetermined threshold. Once activated,the homing system uses IR receivers, RFID readers, and wheel encoders for localisation of the lifting chair, and ultrasonic and optical flow sensors for navigation. The microprocessor receives and processes the sensor data, determines an optimal path to the charging station, and controls the movement of the lifting chair toward the charging station. The docketing mechanism comprising the spring-loaded electrical connector and the alignment pins is adapted to engage with a tapered guide system on the charging station. In use, the docketing mechanism allows for precise positioning and engaging of the lifting chair relative to the charging station. The battery management system is adapted to communicate with the charging station when the lifting chair is docketed. For example, the battery management system is adapted to continuously monitor charging parameters and provide status updates to connected user devices. The autonomous charging capability of the lifting chair ensures that the lifting chair remains operational and ready for use with minimal user intervention. Further, the integrated rechargeable battery system with homing capabilities ensures that the lifting chair maintains optimal charge levels, extends operational time between charges, and provides reliable power for all functions of the lifting chair while minimising user intervention in the charging process.

[0101] The lifting chair 1 and each component thereof may be constructed of any suitable material. Preferably, the lifting chair 1 and each component thereof is constructed of one or more materials that are sufficiently lightweight, durable, and have sufficient strength that be capable of holding the weight of the patient or the subject. Preferably, the lifting chair weighs less than about 50 kg, more preferably less than about 45 kgs, more preferably, less than about 40 kg, more preferably, less than about 35 kg, more preferably less than about 32 kg. Non-limiting examples of suitable materials may include any one or more of:

[0102] Aluminium: Aluminium is lightweight and has low-density and high strength-to-weight ratio. Lifting chairs (and components of the lifting chair thereof) constructed of aluminium are durable, corrosion-resistant, and are long-lasting.

[0103] Carbon fiber: Carbon fiber is an exceptionally strong and lightweight material that is advantageous for high-performance applications including lifting chair construction.

[0104] Composite materials: Composite materials such as fiberglass reinforced plastic or fiberglass-reinforced polymer, offer a combination of lightweight construction and strength. Lifting chairs constructed of composite materials are durable, weatherresistant, and have high strength.

[0105] In a preferred embodiment (not shown), each vertical actuator and each driving actuator are adapted to be remote-controlled. It is to be appreciated that persons skilled in the art could readily adapt the lifting chair 1 such that each vertical actuator and each driving actuator is remote-controlled using mechanisms and techniques well known in the art, and without the need for further invention. For example, the lifting chair 1 may further comprise a lifting chair control system, wherein the lifting chair control system is adapted to independently control the actuation of each vertical actuator and the actuation of each driving actuator. The lifting chair control system may be adapted to wirelessly communicate with a remote-control system using radio frequency (RF), infrared (IR), or Bluetooth technology. The remote-control system may be paired with the lifting chair control system to establish a secured wireless connection between each respective control system. A user may input commands using the remote-control system to motivate the seat 3 in a vertical plane relative to the frame and / or to activate each driving actuator to motivate the frame in a horizontal plane relative to the frame. In use, the input commands from the remote-control system are wirelessly communicated to the lifting chair control system to provide the desired resultant movement of the lifting chair.

[0106] In a preferred embodiment, the lifting chair includes a navigation system for autonomously locating and moving towards the user upon receiving instructions, when in use. The navigation system may include a plurality of sensors such as (and without limitation) an ultrasonic sensor, an infrared sensor, and an LiDAR sensor for mapping a surrounding environment and detecting obstacles, when in use. In this embodiment, the lifting chair includes a control system for initiating a navigationsequence, wherein the control system is adapted to respond to voice commands, app instructions, or signals from a wearable device, when in use. Upon activation, the lifting chair is adapted to use the obtained mapping data and pathfinding algorithms to determine an optimal route to the user's location. The drive system as described herein allows for precise movements and rotations, enabling the lifting chair to navigate through doorways and around furniture when in use. The navigation system significantly enhances user independence, allowing individuals to direct the lifting chair from anywhere within a mapped area, without requiring assistance from a caregiver.

[0107] Preferably, the lifting chair control system is adapted to wirelessly communicate with an electronic device on or with the patient or the subject. For example, the lifting chair control system may be adapted to wirelessly communicate with the electronic device on or with the patient or the subject using RF, IR, or Bluetooth technology. Preferably, the lifting chair control system is adapted to wirelessly communicate with an app on the electronic device, wherein the app is configured to control the lifting chair. The electronic device may be any suitable electronic device such as (and without limitation) a Bluetooth watch, a mobile phone, a tablet, or any other suitable electronic device.

[0108] In use, an electronic device on the patient or the subject may be adapted to detect when the patient or the subject falls. The electronic device may automatically signal to the lifting chair control system the location of the fallen patient or subject. Alternately, the fallen patient or subject may use the remote control to signal their respective location to the lifting chair control system. In turn, the lifting chair may be controlled to migrate or move to the location of the fallen patient or subject. Once the lifting chair reaches the desired location, the seat may be controllably motivated to the second predetermined position to allow the fallen patient or subject to easily and independently transfer to the seat. For example, in the second predetermined position, the seat is adapted to be substantially level to the ground surface, and the footrest is adapted to be in a substantially horizontal configuration relative to the plane of the seat. The second predetermined position reduces the relative differential height between the groundsurface and the seat, thereby making it easier for the patient or the subject to transfer to the lifting chair. In addition, the second predetermined position allows the patient or the subject to independently transfer themselves to the lifting chair and reduces the risk of further falls or injuries during the transfer, which is otherwise common with conventional lifting chairs. After transfer, the seat may be motivated to the first predetermined position. In the first predetermined position, the seat preferably raises to have a height of between about 0.3m to about 1.2m relative to a ground surface, more preferably between about 0.5m to about Im relative to a ground surface, more preferably between about 0.6m to about 0.8m relative to a ground surface, more preferably between about 0.65m to about 0.75m relative to a ground surface. As the seat motivates to the first predetermined position, the footrest inwardly retracts to form a substantially obtuse angle relative to the plane of the seat.

[0109] Preferably, the lifting chair includes an integrated fall detection response system. In this embodiment, the integrated fall detection response system includes an onboard computer configured to interface with a wearable device having fall detection capabilities. The onboard computer includes a wireless communication module adapted to establish and maintain a secure connection with the wearable device using at least one of Bluetooth Low Energy (BLE) and Wi-Fi protocols.

[0110] The onboard computer is further configured to continuously monitor for fall detection alerts transmitted from the paired wearable device. Upon receiving a fall detection alert, the onboard computer is adapted to verify the authenticity of the alert and extract relevant data therefrom, including user identity and location coordinates.

[0111] The integrated fall detection response system further comprises a navigation subsystem operatively connected to the onboard computer. The navigation subsystem includes a plurality of sensors, including but not limited to LIDAR, ultrasonic sensors, and cameras, adapted to create a real-time environmental map. The navigation subsystem is configured to, upon verification of a valid fall detection alert, calculate an optimal path to the fall location and initiate autonomous movement of the lifting chair towards the location.

[0112] The navigation subsystem further comprises a user communication module adapted to transmit status updates to the wearable device and an associated user smartphone. The status updates may include estimated arrival time and user instructions. In use, the navigation subsystem is further adapted to adjust the movement speed of the lifting chair when approaching the fall location and utilise sensor input to accurately locate the fallen user. The navigation system is adapted to position the lifting chair optimally relative to the user to facilitate transfer.

[0113] The integrated fall detection response system further includes a preparation subsystem adapted to position the lifting chair (such as motivate or move components thereof) for user transfer. For example, the preparation subsystem is configured to lower or motivate the seat and backrest, and extend the footrest to assist user transfer. In use and during the response and assistance process, the onboard computer is adapted to maintain communication with the wearable device and smartphone, providing continuous status updates and monitoring for additional user input or situational changes. The integrated fall detection response system as described herein provides rapid and autonomous assistance to users in fall-related emergencies, potentially reducing response times and improving outcomes in such situations.

[0114] Preferably, the lifting chair further comprises an audio instruction module configured to provide audible guidance through the user’s wearable device (such as a smartwatch), offering step-by-step instructions for the operation of the lifting chair.

[0115] Preferably, the lifting chair further includes a position adjustment module interfaced with the onboard computer, configured to receive commands from a user interface application on the user's wearable device. The interface application is adapted to provide a graphical interface enabling precise control of the positioning of the lifting chair (and components thereof, including horizontal position, height, backrest and seat angles, footrest extension, and armrest positioning). In use, upon receiving commands, the position adjustment module actuates corresponding motors or actuators to adjust the lifting chair components, with real-time feedback provided to the wearable device. This feature accommodates diverse user dimensions and preferences, allowing customisedpositioning for safe and comfortable transfers. The interface application may also offer pre-programmed positioning profiles for efficient recurring adjustments, enhancing the overall usability and adaptability of the lifting chair.

[0116] Preferably, the lifting chair comprises a control stick mounted to the first outer armrest, wherein the control stick is operatively connected to each driving motor. The control stick is adapted to pivot in multiple directions, allowing for intuitive movement and directional control of the lifting chair. In use, the directional movement of the control stick (such as forwards, backwards, left, or right tilting of the control stick) is adapted to provide corresponding movement of the lifting chair. Preferably, a top surface of the control stick includes a push button for controlling the actuation of the lifting mechanism of the lifting chair. Preferably, the push button is configured such that a single press initiates the lifting or lowering mechanism and a second press stops the lifting or lowering motion at a desired height. Such an integrated control system allows for precise, single-handed operation of the mobility and lifting functions of the lifting chair, thereby enhancing user independence and ease of use. In an alternative embodiment, the push button on the top surface of the control stick is configured as a momentary switch for controlling the actuation of the lifting mechanism. When the user depresses and holds the push button, the lifting mechanism is engaged, causing the seat to rise continuously. Upon release of the button, the lifting motion ceases, allowing for precise height adjustment when in use. To lower the seat, the user may depress and hold a separate button, or alternatively, the same button may be configured to alternate between lifting and lowering functions with subsequent presses. This hold-to-actuate configuration provides the user with direct, real-time control over the vertical position of the lifting chair, enabling precise adjustments. Such a system may be particularly beneficial for users who require frequent position changes or who prefer a more tactile, responsive control interface.

[0117] The lifting chair optionally comprises an integrated display module. Preferably, the integrated display module includes a touch-sensitive LCD or OLED panel housed in a water-resistant enclosure. The display module is operatively mounted on anarticulating arm affixed to the first or second armrest of the lifting chair. The display module is electrically coupled to a central processing unit of the lifting chair and is configured to render various data, including operation parameters of the lifting chair, user-specific settings, and optionally biometric data. For example, the integrated display module may be adapted to control actuation or motivation of the lifting chair components. For biometric data display, the central processing unit is adapted to interface with biosensors, either integrated within the lifting chair or wirelessly connected to external wearable devices. The biosensors are configured to measure physiological parameters including, but not limited to, heart rate, blood pressure, body temperature, and blood oxygen saturation. The display module's firmware includes a graphical user interface with selectable display configurations for presenting the biometric data. The firmware further comprises an alert generation subroutine triggered when measured parameters deviate from preset thresholds.

[0118] In a preferred embodiment, the lifting chair comprises an integrated temperature control system within the seat. The temperature control system comprises a plurality of heating elements and a plurality of air channels embedded beneath the seat cushion and extending into the backrest. The plurality of heating elements are preferably constructed of flexible, durable conductive materials, and are positioned to provide uniform warmth across the seating surface. The plurality of heating elements are electrically coupled to a power supply and controlled by a thermostat module integrated into the central control system of the lifting chair.

[0119] The temperature control system further comprises an air pump housed within the base of the lifting chair. The air pump is adapted to circulate air through a plurality of perforated channels positioned within the seat and backrest of the lifting chair. In use, the circulated air can be cooled by a thermoelectric cooling module or heated by passing over the heating elements, depending on the user's preference. The temperature control system is operated via the main control interface of the lifting chair, allowing users to adjust temperature settings and airflow intensity.

[0120] In a preferred embodiment, the lifting chair is configured in size to have a reduced width profile for facilitating passage through conventional residential doorways. In this embodiment, the frame of the lifting chair has an overall lateral dimension of less than about 82cm. The lifting chair can be configured in a variety of suitable ways to achieve the reduced width profile whilst maintaining functionality and comfort. For example, the lifting chair may optionally be configured to have a low-profile, wherein the lifting chair comprises pivoting armrests adapted to be inwardly foldable. Alternately or additionally, the lifting chair may comprise a tapered frame utilising high-strength, lightweight materials. Alternately or additionally, the lifting chair may comprise a consolidated drive system within the base. Alternately or additionally, the lifting chair may comprise collapsible side panels for narrow passages. Embodiments, wherein the lifting chair is configured to have a reduced width profile, allow navigation of the lifting chair through conventional doorways without requiring structural modifications to the building, enhancing versatility and user independence.

[0121] The lifting chair may optionally be adapted to traverse stairs. In this embodiment, the lifting chair comprises a reconfigurable wheel assembly. The reconfigurable wheel assembly comprises a plurality of wheel clusters disposed at the periphery of the base of the frame, wherein each wheel cluster is independently rotatable and actuated by an electric motor. The lifting chair further comprises an extendable frame mechanism and a plurality of sensors (such as, and without limitation, a positional sensor, an angular sensor, a pressure sensor, or a combination thereof). The extendable frame mechanism comprises a plurality of telescopic members adapted to adjust the reconfigurable wheel assembly and the center of gravity of the lifting chair. A central control unit is adapted to receive and process data from the plurality of sensors to coordinate wheel cluster movement and frame extension using adaptive algorithms, when in use. The seat may be mounted on a multi-axis articulation system to maintain level positioning. The central control unit may include a user interface that allows activation of the stair-climbing mode. When activated, the lifting chair may automatically adjust its configuration to navigate steps by coordinating wheel cluster rotations and frameextensions. This functionality enhances the lifting chair's versatility, allowing users to overcome architectural barriers.

[0122] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.

[0123] The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A lifting chair adapted for use with a patient with mobility impairments or a subject who is prone to falling, wherein the lifting chair comprises: a backrest; a seat joined to the backrest; a frame adapted to carry the backrest and the seat; a first vertical actuator, wherein a distal end of the first vertical actuator is attached to the seat or the backrest and an opposed end of the first vertical actuator is attached to the frame, when in use, the first vertical actuator is adapted to motivate the seat in a vertical plane relative to the frame; and wherein the lifting chair further comprises: a first driving actuator disposed at a base of the frame, and wherein the first driving actuator is adapted to motivate the frame in a horizontal plane of the frame, when in use.

2. The lifting chair of claim 1, wherein the lifting chair further comprises a second vertical actuator, wherein a distal end of the second vertical actuator is attached to the seat or the backrest and an opposed end of the second vertical actuator is attached to the frame, and wherein the second vertical actuator is adapted to motivate the seat in the vertical plane relative to the frame, when in use.

3. The lifting chair of claim 2, wherein the first vertical actuator is slidably engageable with a first side of the backrest and the second vertical actuator is slidably engageable with a second opposing side of the backrest, and wherein, each vertical actuator is adapted to motivate the seat in a vertical plane relative to the frame, when in use.

4. The lifting chair of any one of the preceding claims, wherein the lifting chair further comprises a second driving actuator, wherein the first driving actuator is mounted at a first side of the base of the frame, and the second driving actuator is mounted at a second opposing side of the base of the frame, and wherein each driving actuator is adapted to motivate the frame in the horizontal plane of the frame, when in use.

5. The lifting chair of claim 4, wherein the first driving actuator is adapted to motivate the frame in the horizontal plane of the frame independent of the second driving actuator, when in use.

6. The lifting chair of any one of claims 2 to 5, wherein actuation of the first vertical actuator is adapted to be synchronised with actuation of the second vertical actuator.

7. The lifting chair of any one of the preceding claims, wherein the seat is fixed at a predetermined angle relative to the backrest.

8. The lifting chair of any one of the preceding claims, wherein the lifting chair further comprises a footrest pivotally secured at a distal end or leading edge of the seat.

9. The lifting chair of claim 8, wherein the footrest is adapted to be moveable between a retracted configuration and an extended configuration.

10. The lifting chair of claim 9, wherein the footrest is adapted to form a declining obtuse angle relative to the plane of the seat when the footrest is in a retracted configuration.

11. The lifting chair of any one of claims 8 to 10, wherein the footrest comprises a supporting wheel, wherein the supporting wheel is adapted to engage with a ground surface to facilitate movement of the footrest between the retracted and extended configuration, when in use.

12. The lifting chair of any one of the preceding claims, wherein the frame is lightweight.

13. The lifting chair of any one of the preceding claims, wherein the lifting chair comprises a cover adapted to substantially cover the lifting chair.

14. The lifting chair of any one of the preceding claims, wherein a first motor is rotatably coupled to the opposed end of the first vertical actuator such that rotation of the first motor is adapted to actuate the first vertical actuator, when in use.

15. The lifting chair of any one of claims 2 to 14, wherein a second motor is rotatably coupled to the opposed end of the second vertical actuator such that rotation of the second motor is adapted to actuator the second vertical actuator, when in use.

16. The lifting chair of any one of the preceding claims, wherein the first driving actuator comprises a first driving wheel and a first driving motor, and wherein the first driving motor is rotatably coupled to the first driving wheel such that rotation of the first driving motor is adapted to rotate the first driving wheel, when in use.

17. The lifting chair of any one of claims 4 to 16, wherein the second driving actuator comprises a second driving wheel and a second driving motor, and wherein the second driving motor is rotatably coupled to the second driving wheel such that rotation of the second driving motor is adapted to rotate the second driving wheel, when in use.

18. The lifting chair of any one of the preceding claims, wherein each vertical actuator is adapted to motivate the seat in the vertical plane relative to the frame such that the seat is moveable to a position substantially level to or flush to a ground surface, when in use.

19. The lifting chair of any one of the preceding claims, wherein the actuation of each vertical actuator and each driving actuator is remote controlled.

20. The lifting chair of any one of claims 2 to 19, wherein the first vertical actuator and the second vertical actuator are each oriented at an oblique angle relative to the vertical plane of the lifting chair.

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