Abstract: A wheelchair includes a chair frame mechanism and two pedal mechanisms. The chair frame mechanism includes a frame body and two pedal-mounting rods. The pedal mechanisms are respectively mounted to the pedal-mounting rods. Each of the pedal mechanisms includes a pivot unit sleeved on the corresponding pedal-mounting rod and having has a guide groove, a positioning unit mounted to the corresponding pedal-mounting rod and engaging the guide groove, and a pedal unit mounted to the pivot unit.

Abstract: A wheelchair includes a chair frame mechanism and two pedal mechanisms. The chair frame mechanism includes a frame body and two pedal-mounting rods. The pedal mechanisms are respectively mounted to the pedal-mounting rods. Each of the pedal mechanisms includes a pivot unit sleeved on the corresponding pedal-mounting rod and having has a guide groove, a positioning unit mounted to the corresponding pedal-mounting rod and engaging the guide groove, and a pedal unit mounted to the pivot unit.

Abstract: A controller shifting device for interconnecting an armrest and a controller of a powered wheelchair includes an adjustment mechanism. The adjustment mechanism includes a casing, a first connection seat connected to the casing for connection with the armrest, and a second connection seat connected to the casing for installation of the controller. When the casing rotates from an operating position to a folded position, the second connection seat is lowered for placing the controller below the armrest.

Abstract: A seat mechanism includes a front seat plate, left and right guide rails each having a longitudinal rail groove, a rear seat plate disposed on the guide rails, two protruding rods each protruding downward from a bottom surface of the rear seat plate to a corresponding guide rail, a plurality of guide members projecting sideward from each protruding rod and inserted into the rail groove of the corresponding guide rail such that each guide rail is slidable relative to the guide members of the corresponding protruding rod, and a plurality of fasteners each extending through the rear seat plate and detachably and selectively engaging one positioning hole in the guide rails for adjustably positioning the rear seat plate on the guide rails.

Abstract: A folding device of a wheelchair includes a first folding unit and a second folding unit, wherein the first folding unit includes a first part, a second part and a connection rod connected between the first part and the second part. The first part has a first link and a second link respectively and pivotably connected thereto, and the second part has a third link and a fourth link respectively and pivotably connected thereto. The second folding unit has two boards and the two boards have two connection units. Each board has a recess and two lugs. Each recess has a first plate and a second plate connected thereto. A handle has two ends which are respectively and pivotably connected to the first and second plates.

Abstract: An expandable armrest of a wheel chair includes a fixed part having a first pivotal portion which includes a first pivotal hole. A movable part is pivotably connected to the first pivotal portion of the fixed part by its second pivotal portion. A first transverse hole and a second transverse hole are defined in the second pivotal portion. A slide member is slidably inserted into the slots of the second pivotal portion and has an inclined hole in which an engaging member is engaged. The engaging member has a first end and a second end. A trace that the engaging member moves in the inclined hole constantly intersects a trace that the first end moves in the first transverse hole and a trace that the second end moves in the second transverse hole, such that the movable part is positioned by controlling the movement of the slide member.

Abstract: A folding device of a wheelchair includes a first folding unit and a second folding unit, wherein the first folding unit includes a first part, a second part and a connection rod connected between the first part and the second part. The first part has a first link and a second link respectively and pivotably connected thereto, and the second part has a third link and a fourth link respectively and pivotably connected thereto. The second folding unit has two boards and the two boards have two connection units. Each board has a recess and two lugs. Each recess has a first plate and a second plate connected thereto. A handle has two ends which are respectively and pivotably connected to the first and second plates.

Abstract: An expandable armrest of a wheel chair includes a fixed part having a first pivotal portion which includes a first pivotal hole. A movable part is pivotably connected to the first pivotal portion of the fixed part by its second pivotal portion. A first transverse hole and a second transverse hole are defined in the second pivotal portion. A slide member is slidably inserted into the slots of the second pivotal portion and has an inclined hole in which an engaging member is engaged. The engaging member has a first end and a second end. A trace that the engaging member moves in the inclined hole constantly intersects a trace that the first end moves in the first transverse hole and a trace that the second end moves in the second transverse hole, such that the movable part is positioned by controlling the movement of the slide member.

Abstract: A chassis structure for a mid-wheel drive power wheelchair includes a pair of restricting racks each having a first restricting plate and a second restricting plate. Each restricting plate has a slot at a central portion thereof. A first fixing member is inserted through one end of the first restricting plate and the slot of the second restricting plate, and a second fixing member is inserted through one end of the second restricting plate and the slot of the first restricting plate, so that the two restricting plates overlap to extend and restrict with each other for maintaining a steady and balancing ride.

Abstract: A chassis structure for a mid-wheel drive power wheelchair includes a pair of restricting racks each having a first restricting plate and a second restricting plate. Each restricting plate has a slot at a central portion thereof. A first fixing member is inserted through one end of the first restricting plate and the slot of the second restricting plate, and a second fixing member is inserted through one end of the second restricting plate and the slot of the first restricting plate, so that the two restricting plates overlap to extend and restrict with each other for maintaining a steady and balancing ride.

Abstract: A battery quick-release structure for an electric mobility scooter includes a chassis, a battery case, hasps, retainers, connection rods, a handle, and elastic members. The battery case is mounted on the chassis. The retainers are disposed on the chassis. The battery case is provided with the hasps. The hasps are pivotally connected to the connection rods. The connection rods are connected to the handle. Both ends of each elastic member are respectively connected to the hasp and the battery case. The hasps are normally locked to the retainers. The battery case is released for portability by pulling up the handle for the connection rods are to free the hasps from the retainers.