This is an example of a compliant mechanism because it has built some in flexibility, which allows the user to force it into one of two stable states. Therefore, it can be used to force a machine to perform two different actions or it can prevent an action. It can be printed in or be cut from a stiff material.
In this example the main advantages are the part count, as only one part performs the function, and the possibility of miniaturization. For more information on compliant mechanisms see https://www.compliantmechanisms.byu.edu/about-compliant-mechanisms.
Bistable Mechanism by BYU_CMR is licensed under the Creative Commons – Attribution – Non-Commercial – Share Alike license.
http://creativecommons.org/licenses/by-nc-sa/3.0/, U.S. Patent No. 7,554,342