Livestock pen structures

Claim 1

A HINGE SET FOR USE IN SUPPORTING A SWINGABLE AND DETACHABLE CLOSURE MEMBER ON A SUPPORTING MEMBER, COMPRISING A PAIR OF L-SHAPED PINTLE BRACKETS, EACH OF SAID PINTLE BRACKETS HAVING A PLURALITY OF MOUNTING APERTURES IN ONE SIDE THEREOF AND SINGLE PINTLE RECEIVING OPENING IN THE SECOND SIDE THEREOF, A PAIR OF HINGE STRAP MEMBERS, EACH OF SAID HINGE STRAP MEMBERS HAVING A PORTION THEREOF BENT BACK UPON ITSELF IN PARTIAL OVERLAPPING RELATIONSHIP TO PROVIDE A PINTLE RECEIVING OPENING, SAID HINGE STRAP MEMBERS HAVING MOUNTING APERTURES BOTH THROUGH SAID OVERLAPPED PORTIONS AND THROUGH SAID UNOVERLAPPED PORTIONS, SAID PINTLE BRACKETS AND SAID HINGE STRAP MEMBERS BEING CONTIGUOUSLY POSITIONED WITH SAID PINTLE RECEIVING OPENINGS IN MUTUAL ALIGNMENT, SAID SECOND SIDES OF SAID BRACKETS AND SAID HINGE STRAP MEMBERS BEING IN MUTUAL ENGAGEMENT AND COOPERATING WHEN IN USE TO PREVENT VERTICAL MOVEMENT OF SAID HINGE STRAP MEMBERS RELATIVE TO SAID BRACKETS, PINTLE MEANS LOOSELY EXTENDING THROUGH SAID PINTLE RECEIVING OPENINGS FOR PIVOTALLY JOINING SAID PINTLE BRACKETS AND SAID HINGE STRAP MEMBERS, SAID PINTLE MEANS HAVING AN OFFSET BENT PORTION TO PREVENT THE VERTICAL DROPPING OF SAID PINTLE MEANS THROUGH SAID MEMBERS, SAID PINTLE MEANS BEING REMOVABLE FROM SAID MEMBERS UPON A SHORT VERTICAL LIFT THEREOF, THEREBY PERMITTING SAID CLOSURE MEMBER TO BE BOTH SWINGABLY MOUNTED AND COMPLETELY DETACHED AS DESIRED.