Underground excavating machine having independently movable half-frames

A machine for excavating an underground gallery, comprising a frame structure consisting essentially of two half-frames vertically arranged side by side, two parallel vertical shafts respectively supported by said two half-frames, a separate turret pivotally supported around each of said shafts, each of said turrets having a cutting head which can rotate around a horizontal axis and which is equipped with tools for excavating, each half-frame having pivotal levers by which it can first be disengaged from the floor and lifted, and then displaced in the gallery by the simultaneous inclination of the pivotal levers and finally replaced on the floor in a fresh position, each half-frame being thus displaceable to said fresh position independent of the other half-frame.

A machine for excavating an underground gallery, comprising a frame structure consisting essentially of two half-frames vertically arranged side by side, two parallel vertical shafts respectively supported by said two half-frames, a separate turret pivotally supported around each of said shafts, each of said turrets having a cutting head which can rotate around a horizontal axis and which is equipped with tools for excavating, each half-frame having pivotal levers which are pivoted in two directions, said levers being interconnected at the bottom by two longitudinal sleepers which can rest on the floor and by means of which the half-frame can first be disengaged from the floor and lifted, then displaced in the gallery by the simultaneous inclination of the pivotal levers, and finally replaced on the floor in a fresh position, each half-frame being thus displaceable to said fresh position independent of the other half-frame.

A machine for excavating an underground gallery, comprising a frame structure consisting essentially of two half-frames vertically arranged side by side, two parallel vertical shafts respectively supported by said two half-frames, a separate turret pivotally supported around each of said shafts, each of said turrets having a cutting head which can rotate around a horizontal axis and is equipped with tools for excavating, each half-frame including two pivotal levers pivotal in two directions on either side of the half-frame, a separate sleeper associated with the two levers on each side of said half-frame, the associated levers being pivotally connected at the ends thereof to said sleeper to form an articulated parallelogram in which the sleeper forms the base and the two pivotal levers form inclined sides, a control jack disposed substantially along a diagonal of the parallelogram controlling the deformation thereof, each half-frame being selectively displaceable independent of the other half-frame in response to the deformation of the associated parallelograms.

A machine for excavating an underground gallery, comprising a frame structure consisting essentially of two half-frames vertically arranged side by side, two parallel vertical shafts respectively supported by said two half-frames, a separate turret pivotally supported around each of said shafts, each of said turrets having a cutting head rotating around a horizontal shaft and having tools for excavating, each half-frame including two pivotal levers pivotal in two directions on either side of the half-frame, a separate sleeper associated with the two levers on each side of said half-frame, the associated levers being pivotally connected at the ends thereof to said sleeper to form an articulated parallelogram in which the sleeper forms the base and the two pivotal levers the inclined sides, a longitudinal jack connected between the half-frame and the sleeper to displace the half-frame longitudinally by articulated movement of said parallelogram for selective movement of each half-frame independent of the other half-frame.