| 摘要 |
FIELD: mechanical engineering; hoists and lifts. ^ SUBSTANCE: invention relates to hoisting devices installed, for instance, on vehicles. Proposed hoist contains base, boom consisting of upper and lower trusses and frame, high-connected to each other with possibility of fitting upper truss into lower one when folding the boom, first platform secured on upper truss and boom lifting hydraulic cylinders. Hoist is furnished with second platform and its lifting hydraulic cylinders. Second platform is hinge-secured on upper truss with possibility of fixing in operating position without lifting the boom by means of pilot-controlled check valve installed on upper truss with possibility of its fixing in folded position by pilot-controlled check valve installed on first platform. Second platform lifting hydraulic cylinders are installed on first platform. ^ EFFECT: provision of operating position without lifting the boom. ^ 2 cl, 3 dwg |
