Abstract: It has been said that the wheel is the greatest invention of all time; when horses or oxen pulled wagons, dirt roads or no roads sufficed, but the wheels of modern transportation require paved roads for cars and trucks, concrete air strips for airplanes, ballast for railroads, concrete for dams, buildings, and many other things. Rock is the material that answers all these needs, but rock must be crushed to usable sizes. Big boulders or quarried rock are crushed by primary stage jaw or very large gyratory crushers that reduces the rock to sizes that second stage crushers can accept, and if the rock needs to be very small a third stage is used. Cone crushers are the crushers of choice for second and often for third stage crushing which is the type crusher of this patent application.

Abstract: A rock crusher of the gyratory cone type having a mainframe structured to be exceptionally strong yet lighter and less costly to manufacture. A tapered spindle bolted to mainframe, is drilled with multiple oil holes, is hollow for circulating heating/cooling fluid, and supports an adjustable thrust bearing. An eccentric member journals on spindle; eccentric has outer taper offset and canted relative to inner taper, and each taper has concentric cylinderical extensions; A gyrating conical member journals on eccentric. Said thrust bearing having spherical surfaces supports conical member on said spindle. A double reduction gear train transfers power to eccentric. Flow dividers direct lubricant to specific multiple ports for hydrostatic lubrication to conical and thrust bearings. Counterbalancing means. A detachable top frame positioned on top of mainframe is restrained against radial and circular movement. Pivoting hooks and hydraulic cylinders tilt outward facilitating rapid servicing.