This chart demonstrates a way to change the design, so that slip-prone controls are changed to slip-proof controls.

• On the left side is the original On-Off switch, which is slip-prone. It is easy to change from On to Off, therefore perators are liable to unintentionally turn off the machine they control.
• On the right side is the resilient variation, which is slip-proof. Operators need to use two fingers to hold the switch to turn it, and it is not likely that they do it unintentionally.

Updated on 20 Jul 2016.