Drilling and bolting apparatus

Claim 1

IN AN APPARATUS OF THE CHARACTER DESCRIBED, AN I BEAM FRAME MEMBER HAVING A CENTRAL WEB AND PARALLEL SIDE FLANGES, A POSITIONING POST, A HYDRAULIC JACK SECURED TO THE POSITIONING POST, IN COAXIAL ALIGNMENT THEREWITH, MEANS ROTATABLE AND SLIDABLY MOUNTING THE POST AND JACK ON ONE SIDE OF THE CENTRAL WEB OF THE FRAME, MEANS CONNECTING THE JACK PISTON TO THE FRAME MEMBER, MEANS ROTATABLE ON THE POST AND ENGAGING THE FRAME FOR ROTATING IT BETWEEN TWO ALTERNATE POSITIONS ON THE POST, LATCHING AND STOP MEANS IN COAXIAL ALIGNMENT WITH THE POST FOR LIMITING ROTATION OF THE FRAME MEMBER, A CARRIAGE SLIDABLE ON EACH OF THE FRAME FLANGES, ONE CARRIAGE BEING ENGAGED BY THE LATCHING MEANS WHEN SAID FRAME MEMBER IS IN ONE ALTERNATE POSITION AND THE OTHER CARRIAGE BEING ENGAGED BY THE LATCHING MEANS WHEN SAID FRAME MEMBER IS IN THE OTHER ALTERNATE POSITION, MEANS MOUNTED ONM THE OTHER SIDE OF THE CENTRAL WEB FOR RAISING AND LOWERING THE UNLATCHED CARRIAGE.