CRANE JIB Russian patent published in 2009 - IPC B66C23/64 

FIELD: lifting-and-conveying equipment.

SUBSTANCE: invention relates to self-propelled jib cranes. Crane jib comprises telescopic jib pivoted to crane platform, jib extension pivoted to the jib, jib extension drive hydraulic cylinders, hydraulic control assembly communicating aforesaid hydraulic cylinder chambers with pressure and discharge lines, and cargo automatic transfer system comprising inclination potentiometre pickups and amplifier arranged in jib and jib extension hinges. Pickup resistors interconnected in bridge circuit are connected, via aforesaid amplifier, to jib extension inclination drive hydraulic cylinder control circuit. Resistors of aforesaid pickups are designed subject to relationships R₁=R_o1α, R₂=R_o2[180°-{α+arcsin((L/1)sin(α)-H/1)}]. Note that jib extension drive cylinder is fixed at telescopic jib last section.

EFFECT: reduced time of horizontal transfer of cargo, easier operation.

5 cl, 5 dwg