Sectional boom for cranes

Claim 1

(A) A SECTIONAL BOOM FOR CRANES, COMPRISING: (B) A FIRST BOOM SECTION; (C) A HINGE BAR MEANS DEFINING A FIRST AXIS DISPOSED ABOVE AND ACROSS ONE END OF SAID FIRST BOOM SECTION; (D) A SECOND BOOM SECTION; (E) A HINGE HOOK MEANS DEFINING A SECOND AXIS DISPOSED ABOVE AND ACROSS ONE END OF SAID SECOND BOOM SECTION AND HAVING A DOWNWARDLY AND OUTWARDLY DIRECTED OPEN SIDE ACCESSIBLE TO SAID HINGE BAR MEANS, WHEN SAID BOOM SECTIONS ARE ANGULARLY RELATED BUT ALIGNED IN A VERTICAL PLANE, WHEREBY SAID AXES MAY BE BROUGHT INTO COINCIDENCE AND SAID BOOM SECTIONS RELATIVELY PIVOTED INTO COAXIAL RELATION; (F) ALIGNING PIN AND SOCKET MEANS IN THE CONFRONTING ENDS OF SAID BOOM SECTIONS OPERABLE TO GUIDE SAID BOOM SECTIONS INTO ACCURATE COAXIAL RELATION AND SECURE SAID BOOM SECTIONS AGAINST RELATIVE LATERAL DISPLACEMENT; (G) AND LATCH MEANS COOPERATING WITH AT LEAST SOME OF SAID ALIGNING PIN AND SOCKET MEANS AND WITH SAID HINGE HOOK AND BAR MEANS TO SECURE SAID BOOM SECTIONS AGAINST RELATIVE AXIAL DISPLACEMENT.