Toolchest

A tool chest hinge mechanism 
It is a four bar linkage. The points are defined by the motion of the four bar linkage.
<object style="height: 250px; width: 400px"><param name="movie" value="http://www.youtube.com/v/agi4FDZY61I?version=3&feature=player_detailpage"><param name="allowFullScreen" value="true"><param name="allowScriptAccess" value="always"><embed src="http://www.youtube.com/v/agi4FDZY61I?version=3&feature=player_detailpage" type="application/x-shockwave-flash" allowfullscreen="true" allowScriptAccess="always" width="400" height="250"></object>