Support for hoists or the like

Claim 1

IN COMBINATION WITH A HOIST INCLUDING A HOUSING, A POWER DRUM ROTATABLY MOUNTED IN SAID HOUSING, MEANS FOR EFFECTING ROTATION OF SAID DRUM, A CABLE ON SAID DRUM AND EXTENDING DOWNWARDLY TANGENTIALLY THEREFROM, SAID CABLE BEING WOUND ONTO SAID DRUM WHEN ROTATED IN ONE DIRECTION AND UNWOUND FROM SAID DRUM WHEN ROTATED IN THE OTHER DIRECTION, A TROLLEY FOR SUPPORTING SAID HOIST FROM A FLANGED BEAM HAVING A HORIZONTAL FLANGE AND A WEB, SAID TROLLEY COMPRISING TWO PAIR OF WHEELS ADAPTED TO RIDE ON THE HORIZONTAL FLANGE OF THE BEAM WITH THE WHEELS OF EACH PAIR LYING ON OPPOSITE SIDES OF THE WEB, AN AXLE FOR EACH OF SAID WHEELS, A PAIR OF SUPPORTING LINKS CONNECTED TO THE AXLES OF EACH OF SAID PAIRS OF WHEELS, EACH PAIR OF SUPPORTING LINKS EXTENDING DOWNWARDLY AND TOWARD THE OPPOSITE PAIR IN A CONVERGING DIRECTION, SPACER BARS SPACING APART THE UPPER ENDS OF SAID PAIRS OF SUPPORTING LINKS ON EACH SIDE OF THE WEB BY A PREDETERMINED DISTANCE, A PIVOT SHAFT CONNECTING LOWER END PORTIONS OF EACH OF SAID PAIR OF SUPPORTING LINKS, TWO BEARING BLOCKS AFFIXED TO SAID HOIST HOUSING THROUGH WHICH EXTEND INTERMEDIATE PORTIONS OF SAID PIVOT SHAFTS BETWEEN THE RESPECTIVE SUPPORTING LINKS, SAID BEARING BLOCKS BEING SPACED APART A DISTANCE LESS THAN THE DISTANCE BETWEEN THE PAIRS OF WHEELS, AND TORSION BUSHINGS BETWEEN SAID BEARING BLOCKS AND SAID PIVOT SHAFTS TO YIELDING SUPPORT SAID SHAFTS, SAID BUSHINGS BEING INCAPABLE OF ROTATING WITH RESPECT TO EITHER SAID SHAFTS OF SAID BEARING BLOCKS, A SAFETY LINK COMPRISING A GENERALLY C-SHAPED ROD, THE FREE ENDS OF WHICH EXTEND OVER THE HORIZONTAL FLANGE OF THE BAEM AND ARE CLOSER TOGETHER THAN THE WIDTH OF THE FLANGE ASND FARTHER APART THAN THE THICKNESS OF THE WEB, A PAIR OF CYLINDERS AFFIXED TO SAID ROD AND SPACED ALONG A HORIZONTAL PORTION THEREOF, ONE OF SAID BEARING BLOCKS HAVING A PIN PASSAGE THERETHROUGH, AND A PIVOT PIN EXTENDING THROUGH SAID PIN PASSAGE AND THROUGH SAID CYLINDERS TO CONNECT SAID SAFETY LINK TO THE ASSOCIATED BEARING BLOCK.