Abstract: A motorized vehicle may include a frame, a drive wheel coupled to the frame, a motor operatively coupled to the drive wheel, and an anti-tip assembly including a first anti-tip wheel. The anti-tip assembly may have a first configuration wherein the first anti-tip wheel is both pivotable about a pivot axis relative to the frame and translatable along a sliding axis.

Abstract: A patient transfer apparatus is provided and includes a frame, a seat assembly coupled to the frame, and a track assembly coupled to the frame. The track assembly includes a moveable track for traversing stairs and a motor configured to drive the track. The apparatus further includes a control system. The control system includes a controller configured to control the motor and to adjust a speed of the apparatus based on an occupancy of the seat assembly upon traversing the stairs based on a current to the motor upon traversing stairs.

Abstract: An axle assembly for a low floor vehicle is described herein. The axle assembly includes an axle housing and a drive unit for driving a wheel assembly. The axle housing including a first gearbox, a second gearbox and a cradle assembly coupling the first gear box to the second gear box. The axle assembly includes first and second hub assemblies that form a first axis of rotation. The first gearbox includes an electric motor that is coupled to a transmission used to rotate an output shaft. The first gearbox also includes a differential mounted for rotation with the transmission and a first drop box mounted for rotation with the differential. The axle assembly also includes a portal axle mounted for rotation with the first drop box and extends from the first gearbox to the second gearbox wherein the portal axle forms a second axis of rotation that is offset from the first axis of rotation of the hub assemblies.

Abstract: Embodiments herein disclose an extended wheel chair having a wheel chair and an attachment device. The wheel chair comprises a body having each of first body part and a second body part mounted over a frame on the wheel chair. The second body part comprises at least two pins and a flat plate. The wheel chair further comprises an attachment device to be mechanically locked to the body of the wheel chair. The attachment device comprises of a body provided with each of a first slot and a second slot. First pin of the at least two pins is engaged with the first slot and a second pin of the at least two pins is engaged with the second slot.

Abstract: A power transmission device include a motor including a rotary shaft, a first decelerator, coupled to the rotary shaft of the motor, configured to receive power from the rotary shaft, a second decelerator, coupled to the first decelerator, configured to receive the power from the first decelerator, and a wheel bearing coupled to one side of the second decelerator. A portion of the first decelerator is configured to insert into the rotary shaft and couple thereto.

Abstract: A mobility aid is provided. The mobility aid includes a mobile base movable along a mobile-base-movement plane, the mobile base having a plurality of wheels. The mobility aid also includes a seat pivotably coupled to the mobile base in a manner so as to be pivotable between a sitting disposition, in which the seat is oriented parallel to the mobile-base-movement plane, and a standing disposition, in which the seat is oriented perpendicular to the mobile-base-movement plane and a sitting surface of the seat is facing forward with respect to a forward-movement direction of the mobile base. The mobility aid also includes a balance-assist unit having a balance-assist-linkage mechanism coupled to the seat, and a body-support-module coupled to the balance-assist-linkage mechanism.

Abstract: Provided is a moving body. A control device of the moving body starts a first control processing that moves a movement part so that a posture of a base with respect to a passenger seat becomes a predetermined posture with an auxiliary grounding part lowered and grounded. The control device starts a second control processing that lifts the auxiliary grounding part with respect to the base and a third control processing that moves the movement part 2 so as to stabilize a posture of the passenger seat after a delay from the start of the first control processing.

Abstract: A mobile robot adapted to traverse vertical obstacles. The robot comprises a frame and at least one wheel positioned in a front section of the robot, at least one middle wheel positioned in a middle section of the robot, at least one back wheel positioned in a back section of the robot, and at least one further wheel in the front, middle or back of the robot. The robot also comprises at least one motor-driven device for exerting a downward and/or upward force on the middle wheel and at least two motors for driving the wheels and the motor-driven device. Also disclosed is a method of climbing using a mobile robot as disclosed.

Abstract: Disclosed is a toilet chair (1) comprising a chair back (2) including a head part (3) and a bottom part (4) and a seat (5) comprising a front part (6) and a rear part (8), wherein the seat (5) further comprises a toilet opening (7) through which a user may go to the toilet. The bottom part (4) and the rear part (8) are arranged next to each other and the bottom part (4) is arranged to be displaceable outwards in a direction towards the front of the chair (1) and the rear part (8) is arranged to be displaceable upwards in a direction towards the front of the chair (1). Methods for aiding a person in getting undressed or dressed by means of a toilet chair (1) and use of a toilet chair (1) is also disclosed.

Abstract: A self-balancing vehicle comprising two axially spaced wheels (3, 4) mounted on a main body (2), an electric drive coupled to at least one wheel (3, 4), control means adapted to maintain the vehicle in balance by controlling the drive, a receptable for carrying and conveying a load, the vehicle having an adjustment mechanism (7) for linear displacement of the receptable arranged so that the receptable is adjustable by the linear displacement both along the longitudinal axis and along the vertical axis of the vehicle.

Abstract: An electric power assist device includes a processor including hardware. The processor assists human power input from a user to a drive member with power of a motor, determines whether a current position is located outdoors using a signal from a sensor, and when determination is made that the current position is located outdoors, reduces an assist amount by the motor as compared with a case where the current position is located indoors.

Abstract: A planetary wheel type obstacle crossing robot, including a frame, a front drive set, and a rear drive set, is provided. The front drive set and the rear drive set are respectively connected to a front end and a rear end of the frame. The front drive set includes a dual-drive steering wheel structure, which includes two drive wheels and two first drive devices. The first drive devices respectively output different rotational speeds to the drive wheels, so that the dual-drive steering wheel structure rotates. The rear drive set includes two planetary wheel sets, two second drive devices, and a planetary wheel set suspension structure. Each planetary wheel set is individually driven and includes a front wheel, a rear wheel, and an upper wheel. The wheels of each planetary wheel set cooperate to climb over an obstacle under an action of a driving torque output by the second drive device.

Abstract: A mobile transport system for transporting objects in a technical system, includes a vehicle frame, a first wheel pair, a second wheel pair, and a third wheel pair, each having two wheels rotatable relative to the vehicle frame, and a swing frame pivotable about a swing axis extending in a transverse direction relative to the vehicle frame. The first wheels of the first wheel pair are attached to the vehicle frame, and the second wheels of the second wheel pair are attached to the swing frame. The third wheels of the third wheel pair are attached to a tilt frame pivotable relative to the swing frame about a tilt axis extending approximately in the longitudinal direction.

Abstract: Embodiments of a wheelchair and suspension system are provided. The suspension includes a drive assembly that is pivotably connected to a base frame at multiple locations. In one embodiment, the connection is via intermediary pivoting links or arms. Embodiments of the links or arms including rigid links, resilient links, elastic links, shocks, springs, gas cylinders and lockable gas cylinders (or combinations of the foregoing). The drive assembly can, via the pivot connections, pivot to accommodate and traverse variations and obstacles on ground surfaces.

Abstract: Disclosed is a personal mobility device including a towing module configured to allow various types of towed modules to be selectively connected and towed, and a connection device configured to connect the towing module and the towed modules. The connection device includes a connection member extending rearward from the towing module, a connection shaft having an upper side rotatably supported on the connection member and a lower side coupled to a shaft coupling hole formed on a connection frame of the towed module, and a locking device provided on the connection frame to lock the connection shaft.

Abstract: Wheeled vehicles, such as wheelchairs, that are adapted to traverse obstacles are provided. The wheeled vehicles include a frame, drive wheels, front anti-tip wheels positioned in front of the drive wheels and rear anti-tip wheels positioned behind the drive wheels. One exemplary vehicle includes front anti-tip wheels supported by rigid arms that are fixed to the frame and drive assemblies that are independently suspended from the frame. Another exemplary vehicle includes a linkage that links the front and rear anti-tip wheels, such that movement of one of the front or rear anti-tip wheel relative to the frame causes movement of the other wheel relative to the frame.

Abstract: A pushchair seat for mounting on a pushchair chassis is comprised of a seating surface and a backrest, wherein the backrest has a distal section and a proximal section which can be rotated relative to the distal section in such a way that the backrest can be folded up from an unfolded backrest usage position into a collapsed backrest storage position.

Abstract: A wheel drive apparatus of an automated guide vehicle (AGV) is provided, which includes: a bogie frame; drive frames including a pair of drive wheels installed so that power is transmitted through opposite side surfaces of the bogie frame, and first auxiliary wheels opposite to second auxiliary wheels, with a gap “b” outside of each of the opposite side surfaces of the bogie frame; rotation shaft portions pivotally coupled at shaft points of each of the drive frames and the bogie frame; and connection portions in which first connection arms are respectively formed in the drive frames, and second connection arms are respectively formed in the bogie frame, and the first and second connection arms are vertically connected as a slip rod so as to move up and down at a predetermined gap “a”, and thus which does not cause the drive wheel to float in the air even if any of the auxiliary wheels or any of the drive wheels of the AGV travelling along the floor contacts a depression, a barrier and a slope.

Abstract: Disclosed is a mobile robot adapted to traverse vertical obstacles. The robot comprises a frame and at least one wheel positioned in a front section of the robot, at least one middle wheel positioned in a middle section of the robot, at least one back wheel positioned in a back section of the robot, and at least one further wheel in the front, middle or back of the robot. The robot also comprises at least one motor-driven device for exerting a downward and/or upward force on the middle wheel and at least two motors for driving the wheels and the motor-driven device. Also disclosed is a method of climbing using a mobile robot as disclosed.

Abstract: Disclosed is a mobile robot adapted to traverse vertical obstacles. The robot comprises a frame and at least one wheel positioned in a front section of the robot, at least two middle wheels and at least two rear wheels. The at least one middle wheel and at least one rear wheel are connected by a tilting lever that is arranged on each of the opposing sides of or to the frame, forming a pair of wheels. Each tilting lever can be turned around a lever bearing located between the respective axial centers of rotation of each pair of wheels.

Abstract: The vehicle is provided with a seat which is movable between a high position and a low position, and configured to be grounded when the seat is at the low position, and a support leg extending substantially downward from the seat of the vehicle. The support leg is movable between a retracted position positioned close to a vehicle body frame and a deployed position positioned remote from the vehicle body frame, the support leg being configured to be at the retracted position when the seat is at the high position, and to move from the retracted position to the deployed position when the seat moves from the high position to the low position.

Abstract: A flexible supporting membrane is made from a stretchable material formed into a sheet that adjusts itself based on the pressure applied by a patient's knees. The membrane includes: a top edge adapted to be located in a vicinity of the knees of the patient when in use; a bottom edge adapted to be located in a vicinity of the patient's ankles when in use; and a first and second lateral edge extending between the bottom edge and the top edge. The flexible supporting membrane further includes a central section and two peripheral sections extending along the direction defined by the lateral edges between the top edge and the bottom edge of the sheet. The peripheral sections are adapted for each supporting one of the two knees of a patient by yielding to the pressure exerted by the knees and thus forming a knee cradling depression.

Abstract: Apparatus and associated methods relate to a removable power assist for converting a manual wheelchair into an electronic wheelchair, based on configuring a friction roller to releasably engage with a wheelchair wheel, configuring the friction roller when engaged to drive the wheel through a contact surface with the wheel above the wheel center and behind the wheelchair seating area, configuring a motor to rotate the friction roller, and moving the wheelchair based on engaging the friction roller and activating the motor to turn the wheel through force by the friction roller against the contact surface with the wheel. The power assist may include a user-operable lever configured to engage or disengage the friction roller without a user leaving their seated position in the wheelchair. Configuring the friction roller above the wheel center and behind the wheelchair seating area may permit collapsible wheelchair folding or unfolding without uninstalling the power assist.

Abstract: Apparatus and associated methods relate to a wheelchair power assist device configured to switch a motorized friction roller between engaged and disengaged modes with a wheelchair wheel, based on an engagement actuator configured to move the friction roller relative to an attachment member removably secured to the wheelchair. The friction roller may be operably coupled with an engagement member configured to move relative to the attachment member. The engagement member may be moved by an extendable and retractable actuator shaft coupled with the attachment member. A manual wheelchair may be converted to a powered wheelchair using a motorized friction roller for each wheelchair wheel. A plurality of power assist devices may be configured to position a respective plurality of friction rollers to leave an open space behind the wheelchair seating area, advantageously permitting the power assist devices to remain attached to a foldable wheelchair in either folded or unfolded configurations.

Abstract: An axle assembly for a low floor vehicle is described herein. The axle assembly includes an axle housing and a drive unit for driving a wheel assembly. The axle housing including a first gearbox, a second gearbox and a cradle assembly coupling the first gear box to the second gear box. The axle assembly includes first and second hub assemblies that form a first axis of rotation. The first gearbox includes an electric motor that is coupled to a transmission used to rotate an output shaft. The first gearbox also includes a differential mounted for rotation with the transmission and a first drop box mounted for rotation with the differential. The axle assembly also includes a portal axle mounted for rotation with the first drop box and extends from the first gearbox to the second gearbox wherein the portal axle forms a second axis of rotation that is offset from the first axis of rotation of the hub assemblies.

Abstract: A mobility vehicle may comprise a frame, a first pivot arm, a second pivot arm, and a suspension assembly. The first pivot arm may be coupled to the frame and coupled to a drive wheel. The second pivot arm may be coupled to the frame and coupled to a ground engaging caster wheel. The suspension assembly may be coupled to the frame. The suspension assembly may include a first spring assembly and a second spring assembly. The first spring assembly may be disposed about a first spring axis and coupled to the first pivot arm. The second spring assembly may be disposed about a second spring axis and coupled to the second pivot arm. The first spring axis and the second spring axis may be disposed relative to each other at an angle of no greater than about 150° when the mobility vehicle is operating on horizontal ground.

Abstract: The electric stroller comprises a frame, a child seat, an operator seat, a plurality of wheels, a port motor, a starboard motor, a control circuit, and a battery. The electric stroller may be a self-propelled conveyance. The child seat may be supported by the frame and may be adapted to transport a child. The operator seat may be coupled to the frame behind the child seat and may be adapted to transport an operator. A port driven wheel may be propelled by the port motor and a starboard driven wheel may be propelled by the starboard motor with the speed and direction of the port motor and the starboard motor controlled independently.

Abstract: A powered balancing mobility device that can provide the user the ability to safely navigate expected environments of daily living including the ability to maneuver in confined spaces and to climb curbs, stairs, and other obstacles, and to travel safely and comfortably in vehicles. The mobility device can provide elevated, balanced travel.

Abstract: The present disclosure relates to an in-wheel driving device and a method for assembling the same, and the in-wheel driving device includes a driving motor including a motor shaft, a reducer which interworks with the driving motor to reduce a rotational force of the driving motor, a reducer housing, in which the reducer is disposed, a first gear connected to the reducer, and a support bearing part which supports the reducer on an outer side of the reducer, the reducer includes a sun gear connected to the motor shaft, a ring gear disposed in the reducer housing, a planetary gear disposed between the sun gear and the ring gear and engaged with the sun gear and the ring gear, and a carrier, in which the sun gear is disposed in an interior thereof, which supports the planetary gear and rotates in conjunction with rotation of the planetary gear.

Abstract: One embodiment of an electric convenience vehicle (ECV) may include a frame, a plurality of wheels configured to support and move the frame, a user support member supported by the frame, a steering mechanism disposed toward a front portion of the ECV, a motor configured to cause at least one wheel to be propelled forward, propelled backward, or to remain in a fixed position, a throttle, when activated in a first position, may cause the motor to propel the wheel(s) in a forward direction, when activated in a second position, may cause the motor to propel the wheel(s) in a reverse direction, and a control and communications unit (CCU) disposed in front of the user support member, and configured to control operations of the motor.

Abstract: A wheelchair suspension comprises a frame, at least one pivot arm, at least one front caster, at least one rear caster, a stabilizing system, and a sensor. The pivot arm is coupled to the frame. The front caster is coupled to the pivot arm. The rear caster is coupled to the frame. The stabilizing system is coupled to the frame and the pivot arm. The sensor is arranged such that tipping of the frame causes actuation of the stabilizing system to at least partially resist further movement of the frame.

Abstract: The present invention relates to a shear force measuring device for measuring a shear force of a human body relative to a seat, such as a chair, wheelchair, aircraft seat, the device including: a frame for providing a mechanical, substantially slide-free connection to the seat, a force sensor arranged on the frame, shear force receiving means for receiving the shear force which are coupled to the sensor. The shear force receiving means are arranged and configured such that shear force exerted on the shear force receiving means is transferable to the sensor so that the shear force is detectable by the sensor. The present invention further relates to a wheelchair or seat, a method and a computer-readable carrier including computer program means.

Abstract: The invention is a control apparatus for a personal vehicle, in particular for wheelchair (10), the control apparatus comprising: a first motion sensing unit (11) adapted for being mounted on a body part and for determining orientation with respect to an external frame of reference, a second motion sensing unit (12) adapted for being mounted on the personal vehicle and for determining orientation with respect to the same external frame of reference, and a processing unit (13) adapted for outputting an inertial control signal corresponding to a relative orientation of the first motion sensing unit (11) and of the second motion sensing unit (12) determined on the basis of a first orientation supplied by the first motion sensing unit (11) and of a second orientation supplied by the second motion sensing unit (12). The invention is furthermore a personal vehicle provided with the control apparatus, and a control method therefore.

Abstract: Design and build new models of wheelchair also design and build equipment for installing on some types of wheelchairs that are in the market for sale, that by using them user will be able to do their personal basic daily tasks without others help. This wheelchair includes a pair of lifting members mounted on said rehabilitation wheelchair for enabling said lifting members to move upward and downward and a moving seat mounted on said rehabilitation wheelchair for enabling user to sit on toilet bowl directly, wherein said moving seat being compressed and said lifting members moving user downward and user sitting on toilet for doing toilet. The user can use this system for changing clothes, washing, doing toilet, moving body vertically up and down, using oven for cooking, picking up materials from higher places that cannot be reached by user, and all actions that involve getting up and picking up.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame, at least one drive assembly and at least one caster pivot arm. The at least one drive assembly and the at least one caster pivot arm are pivotally connected to the frame at a common pivot axis such that the drive assembly and the front caster pivot arm are pivotable relative to one another.

Abstract: The present disclosure provides a cargo rack for a utility vehicle. The cargo rack comprises a base structure, a front wall structure extending upward from the base structure and having a top edge, a pair of opposing sidewall structures, wherein each sidewall extends upward from the base structure and having a top edge, and a back wall structure extending upward from the base structure and having a top edge. The cargo rack base structure is structured to be disposed within a reservoir of a vehicle front body cowl such that the entirety of the cargo rack base structure is disposed within the cowl reservoir.

Abstract: A seating assembly includes a seat operably coupled with a seatback. A calf support is rotatably coupled with the seat. A first motor is proximate the calf support and rotates the calf support outward approximately 90 degrees from a design position to a deployed position. An extension telescopingly engages with the calf support. A second motor is operably coupled with the extension and is configured to move the extension outward.

Abstract: A wheelchair suspension comprises a frame, at least one pivot arm, at least one front caster, at least one rear caster, a stabilizing system, and a sensor. The pivot arm is coupled to the frame. The front caster is coupled to the pivot arm. The rear caster is coupled to the frame. The stabilizing system is coupled to the frame and the pivot arm. The sensor is arranged such that tipping of the frame causes actuation of the stabilizing system to at least partially resist further movement of the frame.

Abstract: A transport apparatus includes a base, a sling, and a support frame mounted to the base. The frame is configured to move from a first position relative to the base to a second position relative to the base. The frame includes a U-shaped frame with a lower cross-frame member and vertically oriented spaced side frame members joined with the cross-frame member. The side frame members support arm rests, and the cross-frame member optionally forms a footrest. In another aspect, the frame includes an access opening to allow a person egress and ingress to and from the sling through the frame.

Abstract: A method for electrically assisting with the propulsion of a rolling system comprising a driving wheel driven by an electric motor, the torque applied by the motor being a function of a propulsion torque transmitted by a user to the driving wheel, wherein the method comprises: a preliminary step of storing in memory an unknown input model representing the weighted system, which is a function of the geometry and of the mass of the weighted system, and having as output data the rotational speed of the driving wheel; a step of estimating unknown input being the total torque applied to the wheel, influencing the rotational speed, the total torque being estimated from the rotational speed by calculating the inverse model; the propulsion torque transmitted by the user being deduced from the total torque estimated on the basis of the other known torques that make up the total torque.

Abstract: A system, method, and device for operations of an electrically motorized vehicle. The vehicle can utilize an electrically motorized wheel to convert a non-motorized wheeled vehicle to an electrically motorized wheeled vehicle. The electrically motorized wheeled vehicle includes a plurality of electrically motorized wheels, each of the plurality of electrically motorized wheels in communication with at least one other of the plurality of electrically motorized wheels to coordinate operation of the vehicle.

Abstract: A steering assist system for a vehicle comprises a steering assist module configured to determine a baseline assistance force to be applied to a steering system of the vehicle, and a transient disturbance compensation module configured to determine a transient compensation force to compensate for transient conditions that urge the vehicle to deviate from a straight path. The transient compensation force is based at least partially on the determined baseline assistance force. The system also includes a steady-state disturbance compensation module configured to determine a steady-state compensation force to compensate for steady-state conditions that urge the vehicle to deviate from the straight path, the steady-state compensation force being based at least partially on the determined baseline assistance force. Methods relate to controlling steering systems.

Abstract: A wheelchair includes a frame, a chair, a pair of drive wheels, a pair of rear wheels, and a pair of front wheels. Each front wheel is part of a front arm assembly that is rigidly coupled to a drive via a mounting plate. The mounting plate is connected to the wheelchair frame by a pivot. The drives are transversely mounted. The batteries are disposed rearward of the drives. The wheelchair seat can be moved forward to provide access to the batteries without fully removing the wheelchair from the frame.

Abstract: A wheelchair lift assembly includes a wheelchair. The wheelchair has a pair of seats and a frame. Each of the seats is hingedly coupled to the frame. Each of the seats is positionable in a stored position having each of the seats being horizontally oriented on the frame. Each of the seats is positionable in a lifted position having the each of the seats hinging upwardly from the upper front member. A lifting unit is coupled to the wheelchair. The lifting unit selectively urges each of the seats between the stored position and the lifted position. Thus, the lifting unit may lift a user thereby facilitating the user to exit the wheelchair.

Abstract: Embodiments of the present disclosure include a wheelchair configured to reposition an occupant between a lowered and a raised position. The wheelchair can include a frame, a seat moveable relative to the frame, a drive wheel, and one or more pairs of arm assemblies. The arm assembly includes a wheel configured to move from a first spatial location when the wheel chair is operating on flat, level ground to a second spatial location that is different than the first spatial location. Arm limiters can selectively engage the arm assembly based on at least one of a seat position, position of the arm assembly and surface conditions of ground surface. The arm limiters can limit the range of motion of the arm assembly and sometimes other operational aspects of the chair.

Abstract: A single passenger carrying mobile robot, includes a single operated member that is operated by a passenger to instruct both a moving direction and a moving speed of the passenger carrying mobile robot, a moving member configured to move the passenger carrying mobile robot and a controller configured to control the moving member based on input information input to the operated member by the passenger, wherein the passenger carrying mobile robot further includes a sensor that acquires obstacle information of a surrounding of the passenger carrying mobile robot, and the controller predicts an expected course of the passenger carrying mobile robot based on the input information and determines based on the obstacle information whether or not an obstacle is located in the expected course, and changes a control of the moving member when determining that the obstacle is located.

Abstract: Embodiments of the present disclosure include a wheelchair configured to reposition an occupant between a lowered and a raised position. The wheelchair can include a frame, a seat moveable relative to the frame, a drive wheel, and one or more pairs of arm assemblies. The arm assembly includes a wheel configured to move from a first spatial location when the wheel chair is operating on flat, level ground to a second spatial location that is different than the first spatial location. Arm limiters that can selectively engage the arm assembly dependent on the position of the arm assembly and surface conditions of ground and can limit the range of motion of the arm assembly and sometimes other operational aspects of the chair.

Abstract: A seat assembly for a conveyance, such as a wheelchair, that allows the user to set the recline angle of the seat back at a seating position, fold the seat back down to a folded position and back up to the seating position, such that the seat back is returned to the seating position at the user selected recline angle R unless the recline angle is adjusted by the user. The user selected recline angle R is not disturbed by folding the seat back from the seating position, to the folded position 106, and back to the seating position.

Abstract: A system and method for modeling supervisory control of heterogeneous unmanned vehicles through discrete event simulation is provided. Generally, the system contains a memory and a processor configured by the memory to perform the steps of: simulating events in the system; simulating arrival processes for the events in the system; simulating how long a human operator takes to respond to the simulated events in the system, where the time that the human operator takes to respond to a simulated event is referred to as a service time; and prioritizing the events to be handled by the human operator, wherein the system models human operator involvement in the unmanned vehicle system.

Abstract: Embodiments of the present disclosure include a wheelchair configured to reposition an occupant between a lowered and a raised position. The wheelchair can include a frame, a seat moveable relative to the frame, a drive wheel, and one or more pairs of arm assemblies. The arm assembly includes a wheel configured to move from a first spatial location when the wheel chair is operating on flat, level ground to a second spatial location that is different than the first spatial location. Arm limiters can selectively engage the arm assembly based on at least one of a seat position, position of the arm assembly and surface conditions of ground surface. The arm limiters can limit the range of motion of the arm assembly and sometimes other operational aspects of the chair.