Abstract: A tooth holder for a cutter of a mining machine has a holder body fixed to the cutter and normally displaced thereby in a predetermined longitudinal direction. This body is formed with a longitudinally generally forwardly open bore, an outer transversely directed seat face adjacent the bore, and a feed passage opening at the outer seat. A sleeve is received in the bore and a cutter tooth is received in the sleeve. A separate nozzle body is formed with a nozzle passage having one end communicating with the feed passage at the seat and an opposite end forming a longitudinally generally forwardly open spray mouth, and a face complementary fitted to the outer seat face. A fluid is supplied under pressure to the feed passage so that the fluid exits the spray mouth. The nozzle body is releasably secured by screws or the like to the holder body with the faces engaged tightly together.

Abstract: A loading mechanism operating on a loading apron of a tunnel and gallery excavator or the like comprises an eccentric-carrying crank disk, a crank lever, a shear rake, and a link. The eccentric-carrying crank disk is rotatable about its axis in a single direction of rotation, and the crank lever is connected to an eccentric pivot on the eccentric-carrying crank disk. The crank lever is pivotally connected by a lever arm to the link, which is attached pivotally to the apron behind the eccentric-carrying crank disk with respect to the forward direction of travel of the tunnel and gallery excavator. The shear rake is constructed as a bent lever with a raking arm and a controlling arm and at the vertex of the angle formed between the raking arm and the shear rake is mounted on the eccentric pivot with a vertex joint.