A modular power assist system for wheelchair users that doubles as a scooter-board for non-wheelchair users

Abstract

The present invention provides a three-way modular power assist system for wheelchair and non-wheelchair users, and it operates in three different modes – Indoor mode, Outdoor mode, and Transport mode. The system consists of two detachable parts, a rear / drive unit (101) and a handle unit (102). The drive unit (101) features a motor-driven rear wheel, and radio modem along with the motor and its controller. It provides power on demand to the wheelchair (104) user. The Front unit (102) comprises controls to manage the drive unit and a foldable footboard (103). The detachable mechanism separates the rear wheel and front handle into two separate parts when not in use. When used outdoors, an attachment mechanism connects the rear wheel at the back of the wheelchair (104) and the front handles to the front portion of the wheelchair (104) at two distinct places (108) and (109).

Description

[0001] A MODULAR POWER ASSIST SYSTEM FOR WHEELCHAIR USERS THAT DOUBLES

[0002] AS A SCOOTER-BOARD FOR NON-WHEELCHAIR USERS

[0003] CROSS - REFERENCE TO RELATED PATENT APPLICATION

[0004] The embodiments herein claim the priority of Indian patent application 202341052017 filed on August 02, 2023.

[0005] FIELD OF INVENTION

[0006] The present invention relates generally to the field of assistive technology, electric mobility, and micro-mobility. Specifically, it focuses on power assist system for wheelchairs to facilitate outdoor mobility and indoor assistance. The present invention addresses the needs of wheelchair users to utilize the system both indoors and outdoors, aiming to enhance overall accessibility and mobility across a diverse environment.

[0007] BACKGROUND OF THE INVENTION

[0008] Wheelchairs are a fundamental and basic form of mobility aid for individuals with physical disabilities. Traditional wheelchairs are propelled by the user manually using their hands to push the wheels. The rear wheel is equipped with hand rims that the users grip to propel themselves forward or backward. Manual wheelchairs may not be suitable for individuals with severe mobility impairments or users with limited upper body strength, as they may find it challenging to propel the wheelchair by themselves. This leads to dependence on assistance from others, limiting their ability to move independently. Also, certain environments like uneven terrains, and tough surfaces may not be wheelchair-friendly which hinders the mobility of individuals relying on manual wheelchairs. The powered wheelchair has overcome these problems by employing electric motors for propulsion, eliminating the need for physical effort. It enables independent mobility, giving users control over their movements without relying on assistance. Furthermore, powered wheelchairs are engineered to navigate various outdoor terrains, including uphill climbs and uneven surfaces, providing greater versatility and accessibility. Despite the numerous advantages offered by powered wheelchairs, they also present certain challenges and limitations. Generally, powered wheelchairs are heavier and bulkier compared to manual wheelchairs. They are not portable and may not easily fit into standard-sized cars, posing challenges for users during transportation, especially when considering the weight limits and space constraints of certain vehicles. Moreover, powered wheelchairs can be challenging to navigate in tight spaces, such as narrow doorways, crowded areas, or spaces with a limited turning radius, impacting user’s ability to move seamlessly in various environments.

[0009] With the advent of technology, power assist wheelchairs have emerged to address specific challenges associated with both traditional manual wheelchairs and fully powered wheelchairs. Power-assist wheelchairs incorporate electric motors that provide assistance during manual propulsion, enabling users to self-propel when possible and utilize powered assistance when facing challenges. This promotes increased independence and control over their movement. With the aid of a power assist wheelchair, users can navigate outdoor environments such as rough terrains, gravel paths, and uneven surfaces. However, a notable challenge with the existing power assist wheelchairs in the market is that they are often specialized for either outdoor mobility or indoor assistance. This necessitates users to invest in multiple devices, each tailored to a particular environment - either indoors or outdoors. As a result, users need to switch between devices depending on their current location or activity. In the current market, these devices are designed specifically for specific purposes, for example, the Permobil SmartDrive caters to indoor applications, while NeoBolt is designed for outdoor usage. Adding to these limitations, existing power assist devices are often either bulky or non-portable, resembling powered wheelchairs in this aspect.

[0010] To overcome such limitations, the present invention aims to introduce a three-way power assist system designed for wheelchair users, that can also function as a scooter board for nonwheelchair users. The present system operates in three modes: an indoor mode for wheelchair users, an outdoor mode for wheelchair users, and a transport mode for non -wheelchair users. The primary goal of the present invention is to provide a power assist solution for wheelchairs adaptable to both indoor and outdoor environments. The present system provides a lightweight solution that offers power-on-demand or power assistance to a manual wheelchair user. The present invention features a detachable and portable three-way power assist unit that can be easily transported in a car alongside a manual wheelchair. Additionally, the present invention provides a convertible scooter mode that can be used by non-wheelchair users as needed.

[0011] Various prior arts have disclosed similar power assist systems for wheelchairs:

[0012] There are several power assist solutions for wheelchairs that already exist in the market. However, these systems often encounter challenges owing to their bulky and non -portable nature. This poses inconveniences for wheelchair users who require frequent transportation of their wheelchairs. Certain power assist devices are designed for either indoor or outdoor use, which limits their versatility. This restriction impacts users who need a solution capable of seamlessly transitioning between different environments.

[0013] US Patent Application US20230172777A1 discloses a system involving the scooter base designed to connect with a wheelchair frame. It includes a locking mechanism integrated into the scooter base which serves to fasten the wheelchair frame to the scooter base. Additionally, there is a steering column connected to the handlebars of the scooter. Overall, the prior art outlines a system and method for connecting a wheelchair with a scooter base using a locking mechanism. It is pertinent to note that the present invention provides a three-way power assist system designed for both indoor and outdoor use, catering to the needs of wheelchair users, and the system can also function as a scooter board for non-wheelchair users. The present invention features a rear-powered wheel that is not rigidly attached to the wheelchair. This design allows for the efficient utilization of the power generated by the wheel to propel the wheelchair, a unique aspect absent in the prior art. The present system is further enhanced by a handle that securely holds the wheelchair at two distinct points, making it more robust. The present invention incorporates a detachable front handle, allowing the wheelchair to navigate in tight indoor spaces with ease. Notably, the present invention employs only three wheels in contact with the ground, including a suspended wheel for improved traction on uneven surfaces. This feature effectively addresses the potential limitations in the prior art, especially concerning traction on challenging terrains. Korean Patent Application KR20190130390A provides an auxiliary power device for a wheelchair, which includes an electric module, and a coupling module coupling the electric module and a wheelchair. Wherein the coupling module includes a first coupling unit installed on the electric module, and a second coupling unit installed on the wheelchair and formed such that a first bending moment downwardly rotating the electric module towards the ground and a second bending moment downwardly rotating the wheelchair towards the ground for balance while a front portion of the wheelchair is lifted from the ground to be coupled to the first coupling unit. In contrast to prior art, the present invention provides a three-way power assist system that can be used by both wheelchair users and non-wheelchair users in three different modes according to their specific needs. The present system is equipped with a powered rear wheel which ensures high traction when going uphill, which is a notable advantage over powered front wheels that experience reduced traction with an increase in gradient.

[0014] Patent Application WO2017185148A1 discloses a multifunctional motor-driven system that can be used in manual wheelchairs which includes a line of interchangeable accessories to transform a wheelchair or a non-powered device into a tricycle or portable motor-driven accessory. It is crucial to highlight that the present invention provides a three-way power assist system designed for both indoor and outdoor use, catering to the needs of wheelchair users, and the system can also function as a scooter board for non -wheelchair users. Notably, the present invention is equipped with a powered rear wheel that ensures high traction even when going uphill as opposed to powered front wheels that lose traction with an increase in gradient. Furthermore, the present invention incorporates a coupling system capable of accommodating wheelchairs of varying widths.

[0015] A Product “Handlebar Attachment Turns a Wheelchair into a Scooter” features an electro-mechanical attachment designed to easily clamp onto most manual wheelchairs. This compact device can be attached in less than a minute, transforming the manual wheelchair into a type of power trike. The Firefly lifts the wheelchair’s smaller front wheels off the ground and replaces them with a larger single wheel. The wheel is attached to a power pack and a set of motorcycle-like handlebars. The device features an odometer, a speedometer, a reverse gear, a parking brake, a twist throttle, and two brake levers. It is important to emphasize that the present invention can be used by both wheelchair users and non-wheelchair users. The inclusion of a powered rear wheel in the present invention ensures exceptional traction, particularly when ascending uphill as opposed to powered front wheels that lose traction with an increase in gradient. Additionally, the present invention incorporates a coupling system that can accommodate wheelchairs on multiple widths.

[0016] Considering the aforementioned prior arts, the present invention distinguishes itself in several key aspects. Unlike the identified prior arts and the available market products that are designed for either indoor or outdoor use, the present invention provides a three-way modular power assist system, designed to operate in customized modes suitable for diverse environments. The present system operates in three modes: an indoor and outdoor mode for wheelchair users and a transport mode for non-wheelchair users. The users can utilize any of the three modes according to their specific needs and requirements. The transition between each mode is achieved easily by a simple locking and detaching mechanism which will be discussed in detail later in the detailed description. The present invention encompasses the integration of a coupling system capable of accommodating wheelchairs with varying widths. Furthermore, the present invention employs the rear wheel powered by a drive unit and controlled by the motor controller provided in the front handle to control the movements of the wheelchair. This particular feature effectively addresses the potential limitations in the prior art, especially concerning traction on challenging terrains.

[0017] OBJECTS OF THE INVENTION

[0018] It is the main object of the present invention to introduce a three-way modular power assist system. It includes two types for wheelchair users and one type for non-wheelchair users.

[0019] It is the primary object of the present invention to provide a three-way modular power assist system by offering users the option to utilize the power on demand or power assistance to operate the wheelchairs.

[0020] It is another object of the present invention to provide a three-way modular power assist system to operate in three modes: an indoor mode for wheelchair users, an outdoor mode for wheelchair users, and a transport mode for non-wheelchair users. It is another object of the present invention to enable manual wheelchair users to work for extended periods without experiencing fatigue by introducing a power assist solution that reduces effort during propulsion, providing additional support through power assistance and on-demand functionalities.

[0021] It is another object of the present invention to deliver a lightweight, detachable, and portable three-way power assist unit that can be transported in a car along with a manual wheelchair.

[0022] It is another object of the present invention to provide a three-way power assist that facilitates manual wheelchair users in navigating uneven or unconventional terrains easily.

[0023] It is another object of the present invention to provide a versatile three-way power assist that is suitable for micro-mobility and can be used by both able-bodied and mobility-impaired individuals.

[0024] It is another object of the present invention to provide a system designed to be adaptable to various scenarios, allowing users to seamlessly transition between different modes tailored to their needs.

[0025] SUMMARY OF THE INVENTION

[0026] The present invention provides a three-way modular power assist system for wheelchair users that doubles as a scooter-board for non-wheelchair users. The three-way assist solution is a transportation solution that works for both wheelchair users and non-wheelchair users. It operates in three different modes: 1. Indoor mode for wheelchair users, 2. Outdoor mode for wheelchair users, and 3. Transport mode for non-wheelchair users.

[0027] In the preferred embodiment of the present invention, wherein the three-way power assist system comprises a motor-driven rear wheel, a front handle with a handle unit provided with motor controls for operating the motor, a detachable mechanism that separates the rear wheel and front handle into two separate parts, and an attachment mechanism to connect the rear wheel at the back of a wheelchair and the front handle in front of the wheelchair. The rear unit has a radio modem along with the motor controller and the motor. The footboard can fold down to connect with the rear unit when the user wants to use the device as a scooter. The present invention features a real powered wheel that ensures high traction even when going uphill as opposed to powered front wheels that lose traction with an increase in gradient.

[0028] In the preferred embodiment, wherein the three-way power assist device can be operated in indoor mode by connecting the drive unit to the wheelchair. In this indoor mode, the user can choose to control movements either manually or with power assistance. The drive unit delivers power on demand to the wheelchair user. The drive unit can be controlled by means of a joystick, which may be either wired or wireless. It can also be controlled by gesture -based or motion-based inputs. The user can simply push the wheelchair to start the drive unit and tap on the push rim to stop it. This empowers users to start and stop the drive unit effortlessly, enhancing their mobility independence.

[0029] In the preferred embodiment, wherein the three-way power assist device can be operated in outdoor mode by connecting the drive unit to the wheelchair and attaching the handle unit to the front of the manual wheelchair. The front handle incorporates a controller to manage the motor operation, directing the drive unit. In this outdoor mode, the handle unit may elevate the caster wheels of the wheelchair to increase the ride quality on uneven, grassy, muddy, or sandy terrains. Moreover, the control on the handle can be connected to the drive unit using any form of wired or wireless communication system.

[0030] In the preferred embodiment, wherein the transport mode in a three-way power assist device can be achieved by folding down the footboard connecting to the rear unit, thus transforming the device into a scooter suitable for non-wheelchair users. The integration of the footboard from the handle unit to the rear unit ensures a compact and streamlined design in scooter mode. It can be used as a regular electric scooter by non-wheelchair users. This transformation effectively converts the device into a fully functional electric scooter, catering to the mobility needs of able-bodied individuals.

[0031] The present invention not only addresses the specific needs of wheelchair users in indoor and outdoor settings but also extends its utility to non-wheelchair users in transport mode. Overall, the integration of the locking and detaching mechanism empowers the users to effortlessly switch between the three modes, customizing the device to their specific needs and enhancing its overall usability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 illustrates a three-way modular power assist system in its two parts in accordance with the present invention. Figure 2 illustrates a three-way modular power assist system being used in three different modes: indoor mode (A), outdoor mode (B), and transport mode 2(C) in accordance with the present invention.

[0033] Figure 3 illustrates a handlebar featuring throttle, brake and display screen in accordance with the present invention Provided below is the list of components of the present invention along with its reference numerals:

[0034] While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of examples in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

[0035] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concept of the term appropriately to describe its own invention in the best way. The present invention should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, it should be understood that equivalents and modifications are possible.

[0036] DETAILED DESCRIPTION OF THE INVENTION WITH RESPECT TO THE DRAWINGS

[0037] The present invention as embodied by "A modular power assist system for wheelchair users that doubles as a scooter-board for non-wheel chair users" succinctly fulfills the above- mentioned need(s) in the art. The present invention has objective(s) arising as a result of the above-mentioned need(s), said objective(s) being enumerated below. In as much as the objective(s) of the present invention are enumerated, it will be obvious to a person skilled in the art that, the enumerated objective(s) are not exhaustive of the present invention in its entirety and are enclosed solely for the purpose of illustration. Further, the present invention encloses within its scope and purview, any structural alternative(s) and / or any functional equivalent(s) even though, such structural alternative(s) and / or any functional equivalent(s) are not mentioned explicitly herein or elsewhere, in the present disclosure. The present invention therefore encompasses also, any improvisation(s) / modification(s) applied to the structural alternative(s) / functional alternative(s) within its scope and purview. The present invention may be embodied in other specific form(s) without departing from the spirit or essential attributes thereof. Throughout this specification, the use of the word "comprise" and variations such as "comprises" and "comprising" may imply the inclusion of an element or elements not specifically recited.

[0038] As shown in Fig. 1, the present invention is provided with a three-way power assist system which comprises two detachable parts - a rear / drive unit (101) and a front / handle unit (102). The drive unit (101) features a motor-driven rear wheel (105), a radio modem along with a motor controller and a motor. The drive unit (101) provides power on demand to the wheelchair (104) user. The rear-powered wheel (105) ensures high traction even when the wheelchair (104) is moving uphill, providing stability and effective movement on challenging surfaces. The drive unit (101) is connected to the back portion of a wheelchair (104) to operate in indoor or outdoor mode. The drive unit (101) can be controlled by a joystick which is either wired or wireless. The control can also be gesture -based or motion-based. The user may simply push the Wheelchair (104) to start the drive unit (101) and tap on the push rim (107) to stop it.

[0039] In the preferred embodiment of the present invention, wherein the controls in the front / handle unit (102) are connected to the rear unit using methods including but not limited to: a. Wired connections for transmission of power and communication and communication to and with sensors. b. Radio-based communication includes but is not limited to Wi-Fi, Bluetooth Classic, Bluetooth Low Energy (BLE). c. Optical communication including but not limited to Infrared (IR), and IR-laser.

[0040] The front / handle unit (102) comprises a handle with controls to manage the drive unit (101) and a foldable footboard (103) connected with the bottom portion of the handle unit (102) on one end. The footboard (103) can be folded upwards along the length of the handle unit (102). The other end of the footboard (103) can be unfolded and connected to the drive unit (101) during transport mode (C). The front handle unit (102) can be detached when users navigate tight indoor spaces. In outdoor and transport modes, it is connected to the wheelchair (104) at two distinct points (108) and (109), enhancing its robustness. In the preferred embodiment of the present invention, wherein the front unit (102), as shown in Fig.3, comprises (i) a throttle / slider (110); (ii) a brake (111); (iii) a display screen (112); (iv) a microcontroller / microprocessor; (v) a speed sensor for the front wheel.

[0041] In the preferred embodiment of the present invention, wherein the throttle (110) present in the front unit (102) is used to receive inputs from the user.

[0042] In the preferred embodiment of the present invention, wherein the brake (111) provided in the front unit (102) connects with a cable, that may be electronic, hydraulic, or pneumatic type. The screen is also provided to display the relevant information to the user.

[0043] In the preferred embodiment of the present invention, wherein the microcontroller / microprocessor is used in the front unit (102) that is capable of Wi-Fi, Near-Field Communication (NFC), Ultra-Wide Band (UWB) Communication, Bluetooth Classic, and BLE communication.

[0044] In the preferred embodiment of the present invention, wherein the speed sensor is located in the front unit (102) to monitor the speed of the front wheel.

[0045] In the preferred embodiment of the present invention, wherein the rear unit (101) consists of but is not limited to (i) a microcontroller / microprocessor, (ii) a modem, (iii) an electronic speed controller (ESC) (iv) a power regulation / battery controller module.

[0046] In the preferred embodiment of the present invention, wherein the microcontroller / microprocessor is used in the rear unit (101) is capable of multiple functions including but not limited to computation of the data received from sensors and communication through Wi-Fi, Near-Field Communication (NFC), Ultra-Wide Band (UWB) Communication, Bluetooth Classic, BLE.

[0047] In the preferred embodiment of the present invention, wherein the modem for cellular communication is provided in the rear unit (101) that is capable of: i. facilitating 4G, 5G, LTE-M, LTE-M1, Low Power Wide Area Network (LPWAN) compatible protocols. ii. Sending and receiving information autonomously for functions like FOTA, Geofencing, Remote telemetry, Spatial location, and orientation, Localization using GNSS, GSM, UWB, and GPS tracking

[0048] In the preferred embodiment of the present invention, wherein the electronic speed controller (ESC) is provided in the rear unit (101) that is capable of functions such as Cruise control, Adaptive gradient climb, Regenerative braking, Limp mode, Kick mode, and Hill hold.

[0049] In the preferred embodiment of the present invention, wherein the power regulation / battery controller module is provided in the rear unit (101) that is capable of the following functions: i. Monitoring the battery’s SoC while charging and during usage. ii. Monitoring the battery for protective functions such as Over Voltage Protection, Over Current Protection, Over Temperature Protection, Under Voltage Protection and Under Current Protection. iii. Current sensing.

[0050] In the preferred embodiment of the present invention, wherein the sensors on the device include but are not limited to: a. Switches to detect physical links between components. b. Throttle / Slider on the front module. c. Independent throttle / slider. d. RPM Sensor on the motor. e. Hall Sensor on the motor. f. Tactile sensor for break detection. g. External sensors mounted on the wheelchair or the user including but not limited to i. Accelerometer, Gyroscope, Inertial Measurement Unit (IMU), ii. Force sensors, Pressure sensors, Touch sensors. h. Speed sensor for idle front wheel.

[0051] In the preferred embodiment of the present invention, wherein the detachable mechanism separates the rear wheel (105) and front handle into two separate parts when the system is not in use. It accomplishes this using a slide and latch mechanism. In the preferred embodiment of the present invention, wherein an attachment mechanism utilizes a gravity-assisted unlatching mechanism wherein when the rear unit is lifted, the clamp attaches to a bar on the wheelchair’s axle and closes due to spring tension once the drive unit is placed down and the wheel makes contact with the ground. This mechanism is used to connect the rear wheel (105) at the back of a wheelchair (104) and the front handle in front of the wheelchair (104) at two distinct points (108) and (109) when used outdoors.

[0052] The present invention incorporates a coupling system (with lockable and load-bearing swivel at the base of the fork on the bottom of the steering tube / handle unit (102) designed to accommodate Wheelchairs (104) of diverse widths. This coupling system is a versatile and adaptable feature that allows the power assist system to integrate with Wheelchairs (104) of different sizes. This adaptability is crucial for catering to the diverse range of Wheelchairs available in the market, providing a universal solution that can be seamlessly connected to and enhance the mobility of different Wheelchair models.

[0053] In the preferred embodiment of the present invention, wherein the three-way assist solution is a transportation solution that works for both wheelchair (104) users and non-wheelchair users as seen in Fig 2. It operates in three different modes:

[0054] 1. Indoor mode for Wheelchair users

[0055] 2. Outdoor mode for Wheelchair users

[0056] 3. Transport mode for non- Wheelchair users

[0057] Indoor mode:

[0058] In the preferred embodiment of the present invention, wherein the three-way power assist system can be operated indoors by attaching the drive unit (101) to the rear side of the manual wheelchair (104). The system provides the user a choice of operating the wheelchair (104) either manually or with assisted power. When the user demands power assistance, the motorized-drive unit (101) provides the required power for wheelchair (104) movement. The user can control their movements with the help of a joystick, which may be either wired or wireless. The user can also operate the system using gesture -based or motion-based inputs. For example, the user has the option to initiate the power assistance by simply pushing the Wheelchair (104), triggering the drive unit (101) to engage and aid with wheelchair (104) movement. To cease the power assistance, the user can tap on the push rim (107) of the wheelchair (104) to stop it, thereby allowing the system to return to manual operation. This functionality is especially useful for indoor environments where users can navigate through tight spaces such as narrow doorways and places with limited turning radius. It offers a user- friendly control and the adaptable control options cater to different user preferences.

[0059] Outdoor Mode:

[0060] In the preferred embodiment of the present invention, wherein the three-way power assist system can be operated in outdoor mode by attaching the handle unit (102) to the front of the Wheelchair (104) and the drive unit (101) to the back side of the Wheelchair (104). The user can control their movements by operating the controls provided on the front handle, which operates the drive unit. These controls include an accelerator for controlling the speed, a button to switch between forward and reverse mode, a horn and a control switch for lights on the wheelchair. These controls on the handle unit (102) can be connected to the drive unit (101) using any form of wired or wireless communication channels. Furthermore, the handle unit may elevate the caster wheels (106) of the Wheelchair (104) to increase ride quality on uneven, grassy, muddy, or sandy terrains.

[0061] Transport Mode or Scooter Mode:

[0062] In the preferred embodiment of the present invention, wherein the three-way power assist system can be operated in transport mode, which can be used by non-wheelchair (104) users as a regular electric scooter. The footboard (103) can be folded or detached depending on the variant of the device, which can be chosen by the user during purchase. The user can control the movements by using the controls provided on the front handle of the handle unit (101).

[0063] In another embodiment of the present invention, various sensors like encoders, IMUs (inertial measurement unit), torque sensors, etc., are embedded in the system to inform, improve, and optimize the ride experience of the user. These sensors play a crucial role in providing realtime data and feedback. They serve to inform the user about the operating conditions, contribute to the improvement of overall system performance, and optimize the riding experience. The data collected by these sensors can be utilized to make adaptive adjustments, ensuring a more comfortable, efficient, and personalized ride for the user. The integration of these advanced sensor technologies adds a layer of sophistication to the three-way power assist system, enhancing its usability and providing a more refined and enjoyable user experience.

[0064] In the preferred embodiment of the present invention, wherein the three-way power assist system is designed to smoothly switch between different operational modes. This ease of transition enhances the overall user experience by minimizing disruptions and optimizing the functionality of the device. It promotes user convenience and accessibility, allowing individuals to adapt the three-way power assist system to their specific needs and preferences with minimum effort.

[0065] EXAMPLE

[0066] The present invention discloses a modular power assist system for wheelchair users that transforms into a scooter board for non -wheelchair users and the system is provided with 2 detachable units: a rear / drive unit (101) and a handle unit (102). The drive unit (101) features a motor-driven rear wheel (105), an SC20 onboard along with a motor controller and a motor. The drive unit (101) gets connected to the back side of a wheelchair (104) to operate in indoor or outdoor mode. The drive unit (101) can be controlled by a joystick which is either wired or wireless. The joystick can be attached to the armrest of the wheelchair. The control can also be gesture-based or motion-based. The user may simply push the wheelchair (104) to start the drive unit (101) and tap on the push rim (107) to stop it. The handle unit (102) comprises a handle with controls to manage the drive unit (101) and a foldable footboard (103) connected with the bottom portion of the handle unit (102) on one end. The footboard (103) can be folded or detached depending on variant of the device, that can be chosen by the user during purchase. The other end of the footboard (103) can be connected to the drive unit (101) during transport mode. The front handle unit (102) can be removed when users navigate tight indoor spaces.

[0067] The system operates in three different modes:

[0068] 1. Indoor mode: The three-way power assist system can be operated indoors by attaching the drive unit (101) to the rear side of the manual wheelchair (104). The system provides the user a choice of operating the wheelchair (104) either manually or with assisted power. When the user demands power assistance, the motorized drive unit (101) provides the required power for the wheelchair (104) movement. The users can control their movements with the help of a joystick, which may be either wired or wireless. The user can also operate the system using gesture -based or motion-based inputs. The user can initiate the power assistance by pushing the wheelchair (104), triggering the drive unit (101) to engage and aid with the wheelchair (104) movement. To cease the power assistance, the user can tap on the push rim (107) to stop it, thereby allowing the system to return to manual operation.

[0069] 2. Outdoor mode: The three-way power assist system can be operated outdoors by attaching the handle unit (102) to the front of the wheelchair (104) at two distinct points (108) and (109) and attaching the drive unit (101) to the back side of the wheelchair (104). The user can control their movements by operating the controls provided on the front handle, which operates the drive unit. These controls on the handle can be connected to the drive unit (101).

[0070] 3. Transport mode: The three-way power assist system can be operated in transport mode, which can be used by non-wheelchair (104) users as a regular electric scooter. The footboard (103) can unfold downwards to connect with the drive unit, thus transforming the device into a scooter suitable for able-bodied individuals. The user can control the movements by using the controls provided on the front handle of the handle unit (102).

[0071] ADVANTAGES OF THE PRESENT INVENTION

[0072] The present invention offers several advantages that contribute to its value as a three-way modular power assist system:

[0073] • It provides users with the ability to operate the system in three distinct modes - indoors, outdoors, and transport mode.

[0074] • It provides a unified solution for indoor and outdoor mobility, eliminating the need for separate devices. • The three-way power assist system enables users to operate wheelchair for longer durations without experiencing significant fatigue. This can contribute to increased independence and a better quality of life for users.

[0075] • The three-way power assist system is designed to help users navigate uneven or unconventional terrains more easily. This is especially beneficial for users who encounter diverse environments in their daily lives.

[0076] • The detachable and portable design of the power assist system facilitates easy transportation in a car along with a manual wheelchair.

[0077] • Suitable for micro-mobility and usable by both able-bodied individuals and those with mobility impairments.

[0078] • The three-way power assist system provides power on demand, allowing users to control when and how much assistance they receive. This level of control is beneficial for users who may require varying levels of assistance in different situations.

[0079] • It incorporates a coupling system, which is a versatile and adaptable feature that allows the integration of the power assist system with Wheelchairs of different sizes.

[0080] Although the proposed concept has been described as a way of example with reference to various models, it is not limited to the disclosed embodiment and that alternative designs could be constructed without deviating from the scope of invention as defined above.

[0081] It will be apparent to a person skilled in the art that the above description is for illustrative purposes only and should not be considered as limiting. Various modifications, additions, alterations, and improvements without deviating from the scope of the invention may be made by a person skilled in the art.

Claims

We Claim,1. A modular power assist system for wheelchair users that doubles as a scooter-board for non-wheelchair users, Characterized by: a detachable rear / drive unit (101) provided with a motor-driven rear wheel (105), an SC20 onboard along with a motor controller and a motor, wherein the drive unit (101) can be connected to the back portion of a wheelchair (104); a detachable handle unit (102) provided with a foldable footboard (103) which is connected to the bottom portion of the handle unit (102) and can be folded upwards along the length of the handle unit (102); a coupling mechanism that integrates the power assist system with the wheelchair (104); wherein the power assist system is a three-way system that operates in an indoor mode (A), an outdoor mode (B), and a transport / scooter mode (C) for both wheelchair users and non-wheelchair users.

2. The system as claimed in claim 1, wherein the drive unit (101) is controlled by a joystick which is either wired or wireless, wherein the control is gesture -based or motion-based.

3. The system as claimed in claim 1, wherein the handle unit (101) comprises of(i) a throttle / slider (110) that receives inputs from the user;(ii) a brake (111) provided with a cable wherein the brake is electronic, hydraulic, or pneumatic;(iii) a display screen (112);(iv) a microcontroller / microprocessor that communicates through Wi-Fi, Near-Field Communication (NFC), Ultra-Wide Band (UWB) Communication, Bluetooth Classic, BLE communication; and(v) a speed sensor that monitors the speed of the front wheel.

4. The system as claimed in claim 1, wherein the rear unit (101) comprises (i) a microcontroller / microprocessor that processes the data received from sensors and communicates through Wi-Fi, Near-Field Communication (NFC), Ultra-Wide Band (UWB) Communication, Bluetooth Classic, BLE; (ii) a modem for wireless communication;(iii) an electronic speed controller (ESC) that enables functions such as cruise control, Adaptive gradient climb, Regenerative braking, Limp mode, Kick mode, and Hill hold; and(iv) a power regulation / battery controller module that monitors the battery’s SoC.

5. The system as claimed in claim 1, wherein the coupling mechanism employs a lockable and load-bearing swivel at the fork on the bottom of the handle unit (102) to integrate the power assist system with the wheelchair (104)6. The system as claimed in claim 1, wherein the indoor mode (A) of the three-way power assistance system is initiated by the user by pushing the wheelchair (104) and triggering the rear wheel (105) drive unit (101) to engage and aid with the wheelchair (104) movement.

7. The system as claimed in claim 3, wherein the user can tap on the push rim of the wheelchair (104) to stop the wheelchair thereby allowing the system to return to manual operation.

8. The system as claimed in claim 1, wherein the outdoor mode (B) of the three-way power assist system is operated by attaching the handle unit (102) to the front portion of the wheelchair (104) at the two distinct points (108) and (109) and attaching the rear wheel (105) of the drive unit (101) to the back portion of the wheelchair (104).

9. The system as claimed in claim 5, wherein the user controls the movements of the wheelchair (104) by operating the controls provided on the handle unit (102), which operates the drive unit (101).

10. The system as claimed in claim 5, wherein the handle unit (102) elevates caster wheels (106) of the wheelchair (104) to increase ride quality on uneven, grassy, muddy, or sandy terrains.

11. The system as claimed in claim 1 , wherein the transport / scooter mode (C) of the three-way power assist system enables unfolding the footboard (103) to connect with the drive unit (101) and thus transforming the system into an electric scooter wherein the user controls the movements of the scooter by using the controls provided on the front handle of the handle unit (102).

12. The system as claimed in claim 1, wherein the detachable mechanism which is a slide and latch mechanism separates the rear wheel (105) of the drive unit (101) and handle unit (102) into two separate parts when the system is not in use.

13. The system as claimed in claim 1, wherein the system enables the wheelchair (104) to be operated either manually or with assisted power provided by the motorized drive unit (101).

14. The system as claimed in claim 1, wherein the controls on the handle unit (102) can be connected to the drive unit (101) using wired or wireless communication system.

15. The system as claimed in claim 1, wherein sensors such as encoders, IMUs, torque sensors, independent throttle / slider, switches, tactile sensor, speed sensor, force sensors, pressure sensors, touch sensors which are embedded in the system to provide real-time data and feedback of the system to the user.

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