HYDRAULIC JACK FOR MOVEMENT OF MECHANISED SUPPORT SECTION Russian patent published in 2009 - IPC E21D23/20 

FIELD: mining.

SUBSTANCE: invention is related to mining and may be used in underground production of minerals with the help of mechanised complexes. For this purpose hollow stem of hydraulic jack from the side of lug or fork is equipped with reinforcement arranged in the form of protrusion, height of which is at least proportionate to external dimensions of cylinder, connection holes for connection of nozzles located on its top. Besides a side slant is arranged on protrusion, being located from the cylinder side and forming wedge surface with its front end. At the same time connection hole for nozzle of electric joints connection is located on top of protrusion immediately after holes for nozzles of working fluid supply and drain on the opposite side of side lateral slant.

EFFECT: increased reliability of operation of hydraulic jack for movement of mechanised support section and accordingly support as a whole, reduced side loads at hydraulic jack stem, simplified supply and drain of working fluid, increased reliability of electric connections of hydraulic jack to system of its control.

5 cl, 5 dwg