Importance

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Abstract

The suspension and hoisting system for a load support comprises two cable circuits, each comprising a cable (C1, C2) fixed at one of the ends thereof to a fixed point (Pf1, Pf2) and at the other end to a lifting apparatus (T1, T2) and being reeved around deflection pulleys (A1, A2, A3, B1, B2, B3) mounted on two parallel shafts (Ax) located adjacent one and the other end, respectively, of the load support, the lifting apparatus (T1) of one of the two cable circuits being provided above one of the ends of the load support and the lifting apparatus (T2) of the other cable circuit being provided above the other end of the load support. The cable (C1) of at least one of the cable circuits is reeved successively around at least two coaxial deflection pulleys (A2, A3, B2, B3) mounted on each end shaft (Ax) according to such a path that on at least one of the end shafts (Ax) at least one pulley (A1) of said one cable circuit rotates in the same direction as at least one pulley (A2) of the other cable circuit under identical lifting or lowering action of the two lifting apparatus (T1, T2), while these two pulleys (A1, A2) are constrained to rotate in opposite directions by the same downwardly oriented force independently of the action of the lifting apparatus (T1, T2). According to the invention these two pulleys (A1, A2) are interlocked to reduce or eliminate any tendency of the load support to incline under the effect of this downward force.

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First Claim