Linkage with means including auxiliary links limiting flexibility in two directions

Claim 1

IN A CHAIN BAND FOR A DRAG CHAIN WITH SELF-SUPPORTING SECTIONS WHEN MOVING ALONG A STRAIGHT LINE: A PLURALITY OF ALTERNATE FIRST AND SECOND FLAT LINK PLATE MEANS IN END TO END AND OVERLAPPING RELATION, EACH OF SAID FIRST LINK PLATE MEANS BEING FORMED OF A PAIR OF PLATE IS STRADDLING RELATION TO THE RESPECTIVE ADJACENT TWO SECOND LINK PLATE MEANS FIRST PIVOTS PIVOTALLY INTERCONNECTING SAID FIRST AND SECOND LINK PLTE MEANS FOR TILTING MOVEMENT RELATIVE TO EACH OTHER TO PERMIT THE CHAIN BAND TO PASS ALONG A CURVED PATH, A PLURALITY OF PAIRS OF SPACED PARALLEL LINK MEMBERS, SAID PAIRS BEING RESPECTIVE ASSOCIATED WITH SAID FIRST AND SECOND LINK PLATE MEANS, THE LINK MEMBERS OF EACH PAIR OF LINK MEMBERS HAVING ONE END THEREOF IN OVERLAPPING ARRANGEMENT WITH REGARD TO THE LINK MEMBERS OF AN ADJACENT PAIR, A PLURALITY OF SECOND PIVOTS RESPECTIVELY CARRIED BY SAID PAIR OF LINK MEMBERS ONLY, THE OVERLAPPING ENDS OF SAID ADJACENT PAIR OF LINK MEMBERS BEING PIVOTALLY INTERCONNECTED BY A SINGLE ONE ONLY AND OF SAID SECOND PIVOTS, THIRD PIVOTS SPACED FROM SAID FIRST PIVOTS AND RESPECTIVELY PIVOTALLY CONNECTING THE OTHER ENDS OF EACH PAIR OF LINK MEMBERS WITH THE RESPECTIVE ADJACENT FIRST AND SECOND LINK PLATE MEANS, AND ABUTMENT MEANS RESPECTIVE CARRIED BY SAID SECOND PIVOTS ONLY FOR ABUTMENT WITH THE LINK PLATE MEANS OF THE RESPECTIVE TWO ADJACENT LINK PLATE MEANS WHEN THE LATTER MOVE FROM A TITLED POSITION TO A STRAIGHTENED OUT POSITION, SAID CHAIN BAND BEING CONSTRUCTED SO THAT STRAIGHT LINES JOINING THE CENTERS OF ADJACENT ONES OF THE SECOND AND THIRD PIVOTS FROM A SERIES OF ANGELS EACH HAVING ONE ON SAID SECOND PIVOTS AT ITS VERTEX AND OPENING TOWARD ONE OF SAID FIRST PIVOTS, EACH SAID ANGLE BEING LESS THAN A STRAIGHT ANGLE IN ALL POSITIONS OF SAID CHAIN TO THEREBY ASSURE BUCKLING OF THE LINK MEMBERS WHEN THE LINK PLATE MEANS CARRYING THE RESPECTIVE PAIR OF LINK MEMBERS TILT RELATIVE TO EACH OTHER.