Chesterfield bed mechanisms and locking means therefor

Claim 1

IN A CHESTERFIELD BED MECHANISM CONSISTING OF A MULTI-SECTION FOLDABLE-FRAME AND A FRAME SUPPORTING STRUCTURE, A HEAD LOCKING ASSEMBLY FOR USE IN COMBINATION WITH AT LEAST ONE OF THE PAIR OF MAIN SUPPORT LEVERS OPERATIVELY AND PIVOTALLY INTERCONNECTING SAID FRAME AND AN ASSOCIATED CHESTERFIELD FRAME, SAID LOCKING ASSEMBLY COMPRISING A BELL-CRANK AND TENSION-ARM, SAID TENSION-ARM BEING PIVOTALLY CONNECTED TO SAID BELL-CRANK, SAID BELL-CRANK COMPRISING A LOCKING ARM AND AN OPERATING ARM, AND BEING PIVOTED FOR ROTATION IN A VERTICAL PLANE ON AT LEAST ONE SIDE OF SAID FOLDING-FRAME WITHITS INTERIOR ANGLE INFERIOR, SAID OPERATING ASSEMBLY, AS CONSIDERED IN THE BED POSITION OF SAID FOLDING-FRAME INTERSECTING SAID LEVER, SAID BELL-CRANK BEING PIVOTED AS AFORESAID ON THE HEAD SIDE OF THE POINT AT WHICH SAID LEVER IS OPERATIVELY CONNECTED TO SAID FOLDINGFRAME, THE SAID PIVOT POINTS OF SAID BELL-CRANK AND LEVER WHICH ARE OPERATIVELY CONNECTED WITH SAID FOLDING-FRAME BEING IN SUBSTANTIALLY THE SAME VERTICAL PLANE, SAID TENSIONARM LYING SUBSTANTIALLY HORIZONTAL, AND EXTENDING FROM ITS POINT OF CONNECTION TO SAID OPERATING ARM TOWARD THE FOOT OF SAID FOLDING-FRAME, THE DISTAL END OF SAID LOCKING ARM BEING ANGULATED, AND BEARING DOWNWARDLY AGAINST SAID LEVER, AND THEREBY CREATING A BOUND SYSTEM AS TO THAT PART OF SAID FOLDING-FRAME WHICH IS ON THE HEAD SIDE OF THE CONNECTING POINTS OF SAID LEVERS THERETO AGAINST DOWNWARD EFFORT APPLIED TO SAID HEAD SIDE.