1. Customization of Educational Resources for Harris-Hillman Special Education School
Robert Connor

2. Proposed Problem
An adjustable tray with side pieces (wings) (to keep arms inside). The tray needs to adjust height and angle--to fit feeder seat.

4. Background Special Education students are Special
Harris-Hillman contains the students that are too handicapped for inclusion
Irene Lowe’s class contains the most handicapped of all Harris-Hillman students
References: Duran, Elva. Teaching the Moderately and Severely Handicapped Student and Autistic Adolescent. Charles C. Thomas:1988
Berdine, W; Blackhurst. An Introduction to Special Education. New York: 1985.

5. Project Breakdown

7. Subject Anthropometrics
Sitting height 60 cm
Weight 26.3kg(58lb)
vertical CG at 30% sitting height (~18cm) from base
horizontal CG 20cm from seat back
Muscle Force exerted in Frontal plane: 20lb
Reference
Roche, Alex and Robert Malina. Manual of Physical Status and Performance in Childhood. Vol. 1A. Plenum Press. New York: 1983.
Muscle Force exerted in the Sagital Plane: 25 lb.

9. Frontal Plane
Sagital Plane

10. Calculations and Testing
Restraint Device
Device withstands calculated extremes in the changes in the CG and the estimated Muscle Force Exertions
Tested initially by weight placement until failure
Tested in classroom with success
Tray table
Calculations show that a working load of 45lb.
Tested by weight placement

11. Design Specifications
Strength Considerations
125 cm^2 of touch fastener minimum
187 cm^2 Incorporated in Design
Safety Factor
1.5

14. Safety Considerations

15. Economic Analysis Market Analysis Cost/Benefit Customers Life cycle
tall, severely-handicapped individuals with little muscle control
10,000 students nationwide
Life cycle
lasts about two years depending of frequency of use
Cost/Benefit
Development Costs
1 for 60 hours
Materials $20
Benefit Analysis
Safer experience
15 minutes of Instructor’s time per day (Correcting a child for one minute every fifteen minutes that the chair is in use. )

16. Questions and Suggestions