Mineral winning plough

A plough for winning material from a mineral face, the plough having a plough body, a carrier for roof-level cutters, and means for adjusting the vertical position of the carrier with respect to the plough body, the adjustment means comprising a worm mounted in a worm chamber formed in the plough body and a toothed rack associated with the carrier, the worm chamber being open on that side which faces the toothed rack thereby to accommodate the worm meshing with the toothed rack and being closed from above by a housing plate detachably secured to the housing, the worm being fixed to a worm shaft which protrudes upwardly through said housing plate into a reduction gear chamber formed between said housing plate and a detachable cover, said worm shaft being drivable through reduction gearing connected to said worm shaft and arranged in said reduction gear chamber, said reduction gearing having an input shaft which extends substantially at right-angles to the axis of the worm shaft, the free end of the input shaft being directed towards the goaf side of the carrier.