DEVICE FOR TELESCOPING TRUCK CRANE 4-SECTION BOOM Russian patent published in 2011 - IPC B66C23/00 

FIELD: transport.

SUBSTANCE: invention relates to machine building and may be used in designing and operating automotive cranes. Proposed device comprises operator's joystick connected with hydraulic control valve, 4-section telescopic boom with pickup secured on the end of first section, and a mark made on second section at preset location other than section start. Second, third and fourth sections are mounted to travel along their axes driven by hydraulic cylinders communicated via hydraulic cline with hydraulic control valve. Proposed device is equipped with control system connected, on one side, with pickup, and, on the other side, with hydraulic control valve, and independent control element connected with control system.

EFFECT: higher efficiency, wideming possibilies.

4 cl, 9 dwg