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I’d be delighted to receive other commercial product examples. Please feel free to send Suggestions, Additions, Corrections, & Comments.
1.
This pen prevents ruining shirts by retracting the tip automatically when the pen is clipped into your shirt pocket. The catch that keeps the tip out is actually in the pocket clip. When you
pullout on the clip to put it on your shirt, the pin that engages the catch is released causing the tip to retract.
2.
Many Elevators are equipped with an electric eye to prevent doors from shutting on people. They also are equipped with sensors and alarms to prevent operation when overloaded.
3.
Some brake systems utilize permanent magnets to generate power-off braking force. Current supplied to magnetic coils counter permanent magnetic force to keep the brakes from engaging during normal operation.
4.
Many smoke detectors are designed so they cannot be mounted on the wall until a battery is installed.
5.
Retail stores and libraries use "electronic article surveillance" systems to prevent removal of merchandise and books that have not been paid for or checked out.
6.
This device continuously monitors the water level. If the level is too low, a valve opens to add water to the pool.
7.
This Stove burner turns off automatically when pot or pan is removed.
8.
The manufacturer has rigged these wallets to sound an audible beep when a card is absent from the wallet. While this device would clearly be annoying to some users, for others it would
be a big help in remember to replace credit cards after use.
Written permission to use these examples can be obtained by writing a short request with your name and company affiliation. Generally, I am willing to extended permission free of
charge, if you will include a reference to mistakeproofing.com in your document or presentation.
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