MOVABLE LOAD-LIFTING DEVICE Russian patent published in 1999 - IPC

FIELD: materials handling facilities. SUBSTANCE: proposed load-lifting device has frame with running wheels, hitch mechanism, and frame-mounted load boom, crank and connecting rod, all being members of four-member articulated lever mechanism, and boom lifting power cylinder. Four-member articulated lever mechanism is made in form of rectilinear directing mechanism (Chebyshev mechanism). Boom lifting power cylinder is connected with middle part of connecting rod and is arranged in parallel with load boom in its upper position. Load boom with crank forms angle of 30-155 degrees. Minimum value corresponds to lower position of boom, and maximum value, to upper position of boom. Axles of hinge joints of crank and connecting rod by means of which they are secured on base lie in one vertical plane. EFFECT: simplified design, facilitated operation. 2 dwg