TELESCOPIC MAST Russian patent published in 2003 - IPC

FIELD: load-lifting facilities. SUBSTANCE: relates to antenna devices of telescopic mast used in mobile radar sets. Proposed telescopic mast comprises fixed outer section secured on base, movable intermediate and inner sections with nuts, drive screw with groove for nuts, and folded and rigged out position locks, all arranged in lower parts of sections. Rigged out position locks are provided with detents with compression spring located in upper parts on intermediate sections and provided with bevels and mating holes in lower parts in corresponding previous movable sections, including inner one. Folded position locks are arranged in upper parts of intermediate and fixed sections Said locks are provided, each, with turning lever with grip and twist spring. Said mast is furnished with mechanism to disengage rigged out position and folded position locks. Mechanism to disengage rigged out position lock comprises bracket installed on each intermediate section following the section furnished with rigged out position lock detent and on fixed section and is provided with bevel for engagement with bevel on corresponding detent. Mechanism to disengage folded position lock is provided with pusher with bevel installed inside upper part of each intermediate section for engagement with lever of corresponding folded position lock and strip with bevel installed on outer lower part of previous intermediate section. At least two folded position locks are installed on all sections, except for inner one, and at least two rigged out position locks are installed in all intermediate sections. EFFECT: improved reliability of structure. 3 cl, 8 dwg