22 To advance progressively move on a track ferree, in particular for operations mining underground

摘要

A description of the progressive advance comprises two carriages of advance 1, 1a connected together by means of a jack 2, which guides a force on a rail 3 and arretables individually with respect to the rail 3. Each carriage 1, 1a comprises a wheel toothed stoppable, in engagement with a toothing has zones 7 provided centrally on the rail 3. The teeth 7, the wheel toothed and the locking means are disposed freely in a vertical longitudinal plane of the rolling rail 3, so as to clear the zones located a dimension of this rail.