METHOD OF WORKING PIT FACE AND IN-PIT CABLE EXCAVATOR TO THIS END Russian patent published in 2012 - IPC E02F3/30 

FIELD: transport.

SUBSTANCE: proposed excavator comprises running gear with platform to support body, cabin, hoisting winch with cable, bipod with pulley and working equipment including boom with head pulley made up of upper and lower links, bar with bucket and pressure mechanism. Note here that said bar is arranged on boom to turn thereon driven by hoisting mechanism and be displaced by pressure mechanism. Boom links are articulated to turn there about driven by their driving mechanism. Note here that upper link may be fixed relative to lower link at two extreme positions. Additional pulley is arranged on lower link jointed by guys with aforesaid bipod. Hoisting winch cable runs over said pulley at one of extreme positions of upper link. Upper link driving mechanism is made up of hydraulic cylinder. Retainers are arranged to fix upper link relative to lower link.

EFFECT: higher efficiency.

4 cl, 2 dwg