Merchandise display shelf

Claim 1

AN ANGULARLY ADJUSTABLE SHELF SUPPORTED, WHEN IN USE, ON A PAIR OF VERTICAL POSTS HAVING VERTICAL ROWS OF PERFORATIONS, SAID SHELF COMPRISING A RECTANGULAR FLAT BODY; SHEET METAL BRACKETS SECURED TO SAID BODY ACROSS END PORTIONS THEREOF AND EXTENDING DOWNWARDLY FROM SAID BODY; COAXIAL PIVOT RIVETS PROVIDED ON SAID BRACKETS ON AN AXIS LOCATED BENEATH SAID BODY AND CLOSE TO THE REAR EDGE THEREOF, SAID BRACKETS HAVING SHORT CLOSED COEXTENSIVE SLOTS DISPOSED NEAR LOWER EDGES OF SAID BRACKETS SAID SLOTS BEING ELONGATED RADIALLY WITH REFERENCE TO SAID PIVOT AXIS; SHEET METAL BRACKET BASES PIVOTALLY MOUNTED NEAR THEIR UPPER ENDS ON SAID PIVOT RIVETS TO LIE FLAT AGAINST EXTERNAL VERTICAL FACES OF SAID BRACKETS, BACK EDGES OF SAID BASES BEING PROVIDED WITH LUGS FITTING INTO PERFORATIONS IN SAID POSTS TO SUPPORT SAID SHELF ON SAID POSTS, LOWER EDGES OF SAID BASES INCLUDING CENTRAL SECTIONS INSCRIBED FROM SAID AXIS BY A RADIUS REACHING APPROXIMATELY TO THE MIDDLE OF SAID SLOTS, STOP SHOULDERS EXTENDING DOWNWARD A GREATER DISTANCE THAN SAID RADIUS FROM SAID AXIS BEING PROVIDED ON SAID BASES AT OPPOSITE ENDS OF SAID EDGE SECTIONS, THERE BEING A SERIES OF NOTCHES CORRESPONDINGLY SPACED IN SAID TWO BASES AND FORMED UPWARDLY FROM SAID CENTRAL EDGE SECTIONS THEREOF; AND TWO SPRING WIRE LATCHES COMPRISING LENGTHS OF SPRING WIRE LYING FLAT AGAINST INNER FACES OF SAID BRACKETS, WITH FRONT END PORTIONS THEREOF RIGIDLY ATTACHED TO SAID BRACKETS, SAID LENGTHS EXTENDING SUBSTANTIAL DISTANCES FROM THEIR AREAS OF SUCH ATTACHMENT TOWARD UPPER PORTIONS OF SAID SLOTS AND LYING APPROXIMATELY NORMAL TO RADII FROM SAID AXIS THROUGH SAID SLOTS, HORIZONTALLY EXTENDING THUMB