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Project Description: Bio-mechanical handle for an X-Acto®
type knife in which the knife's handle can be adjusted in width
for various sized hands, and various tasks.
Related Human Factors:
- Recommended hand tool (screw drivers, hammers, saws, ect.) handles
range from 1 inch to 1.5 inches in diameter.
- Recommended minimum length of hand tool handles is 4.5 inches.
- 45 degree angle between handle and work surface is best for sufficient
downward and lateral pressure. Also enables user to keep wrist straight
while working.
- A thin "pencil" sized handle is best for precision while a thicker
Òscrew driverÓ handle allows for more pressure.
- Current X-Acto® sizes range from 5/16" to 7/8" in diameter and
2 3/4" to 4 3/4" in length.
References: - Human Factors Design Hand Book, Wesley E. Woodson,
Barry Tillman, Peggy Tillman: pg 509 - 512, 637.
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