Abstract: A normally engaged electromagnetic brake assembly includes an auxiliary cam release device. In a preferred form, the electromagnetic brake assembly includes interleaved and axially moveable sets of friction rotors and rings, normally urged together into frictional engagement by means of compression springs. The brake assembly includes an armature ring and coil assembly, wherein the armature ring is normally spaced from the energizable coil by the springs during brake engagement. Upon energization of the coil, the ring is pulled toward the coil against the bias of the springs, whereby the rotors and rings are released from frictional engagement with each other. The armature ring is fixed to an axially moveable shaft; the cam release mechanism is fixed to an opposite end of the same shaft.

Abstract: A mineral cutter pick adapted to be mounted on a mineral mining machine and to cut during translational movement in an endless path thereon which pick comprises a body having a shank of circular cross section for accommodation in a correspondingly shaped recess on a support on a mineral cutting machine to mount the pick on the machine, said shank being adjacent its inner end not substantially less in diameter than at its outer end, the body having a forward end carrying a cutting tip and said body having a passage therethrough for liquid which passage leads from an inlet in the shank to at least one liquid outlet adjacent to the cutting tip.

Abstract: A centrifugal clutch is disclosed characterized by the use of an electromagnet to disengage a driven output load from a driving input member. In the clutch assembly, a rotatable output load is disposed about a rotatable drive shaft that carries centrifugal-responsive friction shoes. The shoes contain a magnetic pole an under centrifugal force move radially outwardly during rotation of the shaft to engage frictionally the output load for common rotation. A stationary electromagnetic coil disposed between the shaft and friction shoes attracts the shoes upon energization away from the output load to interrupt the frictional drive connection.