Boom limit safety device

Claim 1

IN COMBINATION WITH A SUPPORT HAVING ONE END OF A BEAM PIVOTALLY SECURED THERETO, A WINDING DRUM JOURNALLED FROM SAID SUPPORT AND HAVING A TENSION MEMBER WOUND THEREABOUT AND OPERATIVELY CONNECTED TO SAID BEAM FOR EFFECTING SWINGING MOVEMENT OF SAID BEAM IN RESPONSE TO ROTATION OF SAID DRUM, CLUTCH MEANS OPERATIVELY CONNECTED TO SAID DRUM AND INCLUDING MEANS ADAPTED FOR DRIVING CONNECTION WITH A PRIME MOVER AND INCLUDING MOVABLE ACTUATOR FOR RENDERING SAID CLUTCH MEANS INOPERATIVE TO TRANSMIT POWER FROM SAID PRIME MOVER TO ROTATE SAID DRUM, A SPRING LOADED RAM INCLUDING A CLOSED CYLINDER HAVING A PISTON SNUGLY AND SLIDABLY DISPOSED THEREIN WITH ONE END OF A PISTON ROD SECURED THERETO WHOSE OTHER END PROJECTS OUTWARDLY OF ONE CLOSED END OF SAID CYLINDER AND IS PROVIDED WITH AN ABUTMENT, AN EXTENSIBLE MOTOR INCLUDING A CLOSED CYLINDER MEMBER HAVING A PISTON SNUGLY AND SLIDABLY DISPOSED THEREIN WITH ONE END OF A PISTON ROD SECURED THERETO WHOSE OTHER END PROJECTS OUTWARDLY OF ONE CLOSED END OF SAID CYLINDER MEMBER, MEANS OPERATIVELY CONNECTING SAID OTHER END OF THE LAST MENTIONED PISTON ROD TO SAID ACTUATOR, FLUID CONDUIT MEANS COMMUNICATING THE OTHER CLOSED ENDS OF SAID CYLINDER AND CYLINDER MEMBER, HYDRAULIC FLUID DISPOSED IN SAID FLUID CONDUIT AND SAID OTHER ENDS OF SAID CYLINDER AND CYLINDER MEMBER, AND MEANS MOUNTING SAID RAM ON SAID SUPPORT WITH SAID PISTON ROD DISPOSED IN THE PLANE OF MOVEMENT OF SAID BEAM AND SAID ABUTMENT DISPOSED FOR ENGAGEMENT WITH A PORTION OF SAID BEAM SPACED LATERALLY OF ITS AXIS OF ROTATION DEFINING A LIMIT POSITION OF SWINGING MOVEMENT OF SAID BEAM TOWARD SAID RAM, WHEREBY AS SAID ABUTMENT IS ENGAGED BY SAID BEAM TO MOVE THE POSTON OF SAID RAM. THE PISTON OF SAID FLUID MOTOR WILL BE MOVED AND THEREBY EFFECT MOVEMENT OF SAID ACTUATOR TO DECLUTCH SAID WINDING DRUM.