A collapsible support platform having a table, two collapsible support legs interconnected by a pivot rod, two pivot brackets secured to the table and cooperating with the pivot rod, and a latch spring and latch lever also secured to the table to guide movement of the pivot rod in the brackets....http://www.google.es/patents/US4735392?utm_source=gb-gplus-sharePatente US4735392 - Collapsible support platform
