Folding Leg Bracket - Hardware http://www.leevalley.com/en/hardware/page.aspx?p=40035=3,41306,41309=1#
Folding Table Leg Hinge Hardware S-149L
Steel Pipe Folding Table by ModernIndustrialist on Etsy
Folding Poker Table Legs 36 Tall X 24 Inches Wide (Pkg./2) - $47.65
like the way these legs stow into the table and the way they use the ledge to control the opening of the legs!
Foldable Table Legs Bracket Folding Leg Accessory Spring Loaded Self Lock
Folding Coffee Table Legs More
Lock-In / Lock-Out Folding Table Leg Bracket, for 38mm Wide Legs
Easy, Cheap Folding Workbench!