One Handed Steering Tricycle

Jay Hannan
Jake Moultrie
Jeremy Cook
Jeb Stuart

Abstract

Our project is to design a one handed bicycle for a 3 year old girl that has limited mobility due to Cerebral Palsy.

Introduction

We met with our project family to observe what details would need to be included for the one-handed bicycle. We observed the
shortcomings of a standard bicycle and a standard tricycle. With this information, we will be able to design a bicycle more suited for the child.

Design Specifications

*Must be able to be steered with one hand.

*Should be sized to be operated by a 3 year old child, but large enough that it will be usable past this age.

*The bike should be motor powered as the child is not yet able to pedal it on her own (if standard pedal systems are used).

*Bicycle pedals should be farther forward than on a standard bicycle, but not located on the front wheel.

*Bicycle may or may not use pedals.

*The bicycle should be easy to get on and off of (not requiring equipment that takes a long time to set up) as
the child would like to be able to go from bicycling to other activities quickly.

*Motor speed should be between 2.5-8 mph.

*Motor should be kept on by continuous pressure applied by the operator. This will allow quick power-down for safety reasons.

Design Concepts

Our team has came up with three different design concepts from which we will choose our final design.

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Design Concept 1

Design Concept 1 is a modified recumbent tricycle. The pedals will be replaced by footrests and it will be motorized.
The right-side footrest will house the power switch for the motor.

Pros:
Handle design allows the child to steer easier with one arm.
The length of the tricycle is adjustable so that it can fit her as she grows.
Lack of pedals insures that her feet cannot be caught up in them when the motor is powering it (additional safety).
Base model of the tricycle is available to purchase.

Cons:
The tricycle will not be able to be pedaled.

Concept Evaluation

Design Overview

Give a brief description and schematics of the final design. Divide into as many subheadings as needed for organization.

Analysis

We ran calculations to determine the power of the motor desired, if the child would be able to steer, and if the mother would be able to stop the
trike by hand.

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We ran these calculations using an angle to represent internal friction as well as rolling friction as advised by Dr. Canfield. The second calculation
is a more accurate version of the first, and the third accounts for the weight of our selected motor. As advised by Dr. Canfield, we decided that a 600W motor
is close enough to the calculated value for our purposes.

Bill of Materials

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Part Drawings

Assembly Instructions

Include as many descriptive pictures as possible.

Implemented Design

Include pictures of the final product.

Summary and Conclusions