Category: Lower Extremity Disabilities

Custom Powered Scooter

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---- PROTOTYPE --------- PURPOSE: To create a prototype a custom powered scooter for an child with Thrombocytopenia with Absent Radius (TAR) syndrome that assists him in traveling but is not as cumbersome and restrictive as a powered wheelchair. The Custom Powered Scooter is modified from an E200 Razor electric scooter. Custom additions include a free-wheel mechanism, adjustable seat, auxiliary wheels, extended handlebar, and foot-mounted brake and accelerator controls. A one-way bearing incorporated into the back wheel allows the scooter to free-scoot. Two custom adapters, machined from aluminum, secure the bearing to the rear wheel with a press fit. One adapter connects the outer surface of the bearing to a sprocket driven by the motor, and the other adapter connects the inner surface of the bearing to the hub of the rear center wheel. A threaded stainless steel rod, 10 millimeters in diameter, serves as a rear axle to mount two auxiliary 8-inch pneumatic tires. A support frame, made from a strip of steel, 0.25 x 1 x 21 inches (DxWxL), attaches to both sides of the axle from the scooter frame to prevent flexing of the axle. Wheel guards, made from aluminum strips, 0.25 x 1 x 16.5 inches (DxWxL), attach to the back axle and cover each of the auxiliary wheels, preventing inadvertent catching of the wheels on low objects. A Schwinn No Pressure Bike Seat is attached to an aluminum plunger, 0.995 inch in diameter and 1 inch long. The plunger is encased by a seat post and allows for 8 inches of height adjustment. The seat post is 1.25 inches in diameter at the base, 1 inch at the top, and 14 inches long. The seat post is secured to a plate on the scooter frame with a 3-inch long aluminum sleeve (2-inch outer diameter and a 1.25-inch inner diameter) that fits around the base of the seat post and is bolted to the post. The handbrake of the E200 was moved from the handlebars and is secured to the right side of a 20 inch long, 0.875 inch diameter steel rod. The rod is attached to the front base of the scooter with a custom aluminum adapter. A plastic pedal allows the child to control the brake with his right foot. The hand throttle of the E200 was moved from the handlebars and secured to the left side of the steel rod. A plastic pedal allows the child to control the speed with his left foot. Bicycle handlebars are bolted to a U-shaped bar attached to a handlebar stem. The handlebar stem fits into a 21.5-inch long shaft of 1-inch inner diameter bicycle tubing, which is welded to the neck of the scooter. The cost of the components for the device is approximately $380, not including the cost of the Razor E200. TITLE: Custom Powered Scooter. JOURNAL: NSF 2010 Engineering Senior Design Projects to Aid Persons with Disabilities. REF: Chapter 7: pp. 60-61. PAGES: 3 with cover. 2010.


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Custom Powered Scooter