GB333642A - Improvements in machines for crushing coal, stone and similar materials - Google Patents

Abstract

333,642. Martinez, H., and Kirk, R. H. May 21, 1929. Crushers with vibrating jaws wherein the operative member or members and for the abutment opposed to it or them are so mounted that, in the event of choking or fouling, abnormal resistance is absorbed by one or more springs or other resilient devices are characterized in that the resilient devices are positioned so as to allow the operative member or members and/or the abutment to yield at both the intake and the output end of the machine. The moving jaw comprises two rollers b<1>, b<2>, Fig. 1, mounted on shafts c', c<2>, of which c<2> is resiliently mounted and c' is carried by arms e movable about the axis of the shaft c<2>. The shafts are fixed to levers f<1>, f<2> which are connected together by links f<3> and the levers f<1> are provided with perforated crossheads g through which slide eccentric rods j operated by eccentrics j<2>. The crosshead g is maintained in position by springs m', m<2> and a third spring n encircles a rod n' connected to the crosshead at one end and slidable in a pivoted block n<2> at the other. Rotation of the eccentric j<2> moves the roller b<1> toward and away from a fixed jaw a and so breaks the material entering a hopper h. If the machine becomes choked the rollers move rearwardly either at the upper or lower end or both, the movement of the eccentric merely compressing the springs m<1>, m<2> alternately. The rollers may be separated and a corrugated &c. jaw disposed between them. The springs absorbing abnormal resistance to the operative jaw b may be dispensed with and the stationary jaw a mounted resiliently or the abutment a may be replaced by a jaw operated in the same manner as the jaw b. In Fig. 3, the moving jaw b is connected at the upper end to the eccentric rod j by a link b<3> and at the lower end to a link q<1>, q<2> pivoted at q, the arm q<2> being connected by a link q<3> to the eccentric rod. A rod n<1> is connected to the eccentric rod by a cross-head p and is slidable through a pivoted cross-head n<2>. The link ql, q<2> may be resiliently connected at the ends or the pivot q may be resiliently mounted. The pivot q and cross-head n<2> may be adjustable to vary the position of the moving jaw b. The rod n<1> and cross-head n<2> may be dispensed with by connecting the eccentric rod to one arm of a pivoted bell-crank lever and permitting the link b<3> to slide through the other arm against the compression of a spring surrounding the link. In Fig. 4, the sheave r of the eccentric j' is bored to receive slidable rods g<3> connected together and to the moving jaw b by a crosshead g<2>. Springs m<1>, m<2> are placed on the rods on each side of the sheave r and position the upper end of the jaw b, the lower end of the jaw being connected by a rod n' slidable against the compression of a spring n in a pivoted crosshead n<2>. An adjustable rod s may connect the sheave rand the lower end of the jaw.