У вашего броузера проблема в совместимости с HTML5
Spring toggle mechanism enables to reach end positions of a lever quickly and holds it there firmly.
The violet double crank represents manual action.
The mechanism is used for electric switches.
Inventor files of this video:
http://www.mediafire.com/file/wxja9a1jgy1rmfq/SpringToggle5Inv.zip
STEP files:
http://www.mediafire.com/file/7blgd1gy4etox88/SpringToggle5STEP.zip