Can and did Camera #1 - What is a fail-safe?

This image, shot at a construction site demonstrates a fail-safe mechanism. 

Alright folks,
In this first post about real estate related photography, we try and demonstrate in one image, everything that a fail-safe mechanism is supposed to be. If you need to get a hang of it real quick, try and picture the same construction steel cutting tool without that single spring to hold it all up and safe. Neat eh?
We will bring you more of those. Feel free to re post, share and save!
Cheers.