Patent ID: 8220860

Claim:
Control device for both opening and closing sheets or tarpaulins used to cover open top bodies in industrial or agricultural vehicles wherein respective cable rings ( 3 d and 3 s ) are sliding along lateral walls ( 12 d and 12 s ) of an open top body ( 1 ) of said vehicles, centerings ( 21 a and 21 b ), supporting the tarpaulin ( 2 ) fixed thereon, are placed on right and left upper lengths ( 3 a ) of the cable rings ( 3 d and 3 s ), the centering ( 21 a ) facing to a rear part of the open top body ( 1 ) being fixed, by means of short tubular pieces ( 22 a ) at the lateral ends, on the corresponding upper lengths ( 3 a ) of said cable rings ( 3 d and 3 s ) on a right and left side respectively, while centerings ( 21 b ) are sliding on said upper lengths ( 3 a ); said cable rings ( 3 d and 3 s ) result in being tightened between rear lateral pulleys ( 4 d and 4 s ), which are applied to rear ends of upper edges of the relative lateral gates ( 12 d and 12 s ), and vertical driving pulleys ( 6 a and 6 b ) which are housed in telescopic casing ( 9 ) passing through pairs of pulleys ( 5 d , 5 ′ d and 5 s , 5 ′ s ) which are slightly protruding from lateral ends of the casing ( 9 ) and presenting respective grooves at a same height and in alignment with grooves of the pulleys ( 4 d and 4 s ), characterised in that said driving pulleys ( 6 a and 6 b ) are set in motion by means of bevel gears ( 7 a , 7 b and 7 c ), wherein the gear ( 7 a ) with the driving pulley ( 6 a ) and the gear ( 7 c ) with the driving pulley ( 6 b ) are mounted coaxially one in front of the other on opposite sides of the central bevel gear ( 7 b ) which is manually driven by means of crank ( 81 ) and driving shaft ( 8 ), and in that lengths of the cable rings ( 3 c and 3 f ) extending between said pulleys ( 5 d , 5 ′ d and 5 s , 5 ′ s ) are disposed parallel one another so that the upper lengths ( 3 a ) move in a same direction.