HEAT SWITCH

OverviewConcept DesignsPrototypeFinal Drawings

the Prototype
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Testing the prototype

Some notes:

What we're delivering to you is a prototype, not completely functional nor immediately substitutable with the old heat switch. We ran into some problems on this end that we should explain.

1. The base is asymmetric because we left room for a pin stop on one side that we thought might be an added feature to prevent jamming. We never actually added this stop.

2. We ran out of gold sputter halfway through our sputtering, so only one side of the contacts is coated with gold, and there was no way to get more gold before the project was over.

3. The guides on either side of the heat switch should either be press fit on one side or have snap rings that keep them in place. Ours have neither, but continue to function.

4. The heat switch shaft now rotates clockwise to tighten and counterclockwise to loosen, the same as a normal screw, but opposite to the old heat switch.

5. The springs (not pictured) go on either guide between the contacts in order to keep the contacts separated when the switch is open. The springs were acquired from Century Springs and have the following information: Part No. S-1547; OD = 0.219 in; Free length = 0.31 in; K = 1.6 lbs/in; Suggested max deflection = 0.24 in; Sugg Max Load = 0.39 lbs.

Part Diagram