Patent ID: 9568142
Date: 2017-02-14
CPC Classifications: F16G,F16M

Claim:
1. Counterbalancing structure ( 1 ) for counterbalancing a load, said counterbalancing structure ( 1 ) comprising support means ( 3 ) for the support of said load, said support means ( 3 ) being able to rotate along a plane or vertical plane (β) with respect to a first axis or vertical axis (y) laying on said plane (β), a first movable pulleys group ( 2 ) comprising at least a first upper pulley ( 4 , 5 ), precompressed elastic means ( 10 ), and at least a rope or line ( 11 , 12 ) fixed at a first end to said elastic means ( 10 ) and at the second end to said support means ( 3 ), said at least a rope ( 11 , 12 ) passing at least on said at least a first upper pulley ( 4 , 5 ) such to act in compression on said the elastic means ( 10 ) when said load is coupled to said support means ( 3 ) and said support means ( 3 ) are rotated with respect to said first axis or vertical axis (y) by an angle equal to 0°-+90° or 0°-−90° in order to counterbalance the weight of said load, said at least a first upper pulley ( 4 , 5 ) being movable along a second axis (y) in such a way to vary the capacity of the load of said support means ( 3 ) and in such a way to be able to counterbalance the weight of said load when it is coupled to said support means ( 3 ), said counterbalancing structure ( 1 ) being characterised in that it comprises an adjusting mechanism ( 16 ) for the adjusting of the pre-compression of said elastic means ( 10 ) configured in such a way to adjust the pre-compression of said elastic means ( 10 ) with varying load to be supported by said support means ( 3 ) by means of the movement of said at least a first upper pulley ( 4 , 5 ) along said second axis (y).