Team HERDDIndividual Pages
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Solid Modeling a Resistor Inspired Sunglass CaseResistors come in many shapes and sizes. The barrel resistor was the inspiration for this sunglass case and several examples are shown below. Notice how they all have a similar characteristic shape. Also, they have 3, 4, or 5 color bands depending on the value of the resistor and the tolerance.
Based on the reverse engineering measurements of commercial sunglass cases, the average size for a case was approximately 6" long by 2.5" wide and 1.5" thick. Using these dimensions, the halves of the sunglass case were modeled in Solidworks. Multiple planes were required to create the compound curves in three dimensions.
After the case halves were modeled, a hinge was designed and the parts assembled into a functional sunglass cases that could pivot on the hinge axle. For simplicity, the spring was not modeled and neither were the mechanical fastener tabs of the outer shell through the hinge.
The assembled sunglass case dimensions are shown in the following blueprint. From the design, you can see that the hinge surface is flat, this is necessary to prevent binding of the rear edge of the case halves, as creating a symmetric case that truly looks like a resistor is not possible with a standard piano hinge and would require a more sophisticated hinge/pivot mechanism that would probably be overkill for a sunglass case and therefore dropped from further exploration.
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