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Abstract

A portable vibrating screen which has an arched frame, a basket supported on top of the arched frame by springs and a rotatable eccentric shaft for imparting a reciprocal movement to the basket. The arched frame has a vertical tall end, a vertical short end and two spaced apart stringer members joining the upper portions of the tall and short ends. The stringer members define an inclined plane between the tall end and the short end. The tall end has a first pair of spaced apart leg members and a first ballast mounted between the leg members of that first pair. The short end has a second pair of leg members and a second ballast mounted between the leg members of that second pair. An amplitude of a vibration of the basket transmitted to the arched frame is largely absorbed by the mass of the first and second ballasts. In another aspect of the present invention, the eccentric shaft has bearings attached to the basket and to the stringer members for retaining the basket along the inclined plane. The stringer members are flexible, within an elastic limit thereof, a sag distance corresponding to at least an offset dimension of the offset shaft. When the basket is filled with a load of screenable material which is larger than a normal load, the eccentric movement of the shaft is partly or entirely absorbed by the deflection of the stringer members.

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First Claim