Devices for limiting the stroke of a hydraulic ram used in mining apparatus

In or for mineral mining apparatus;

• the combination of a double-acting hydraulic ram with a relatively-displaceable cylinder component and piston rod, a head piece component fitted to the piston rod to confront the cylinder components, and an adjustable device for selectively limiting the stroke of the ram, said device comprising a stop member disposed between said components, the stop member partly surrounding the piston rod so as not to extend around the full periphery thereof, and connecting means at least including a plurality of elongate pins aligned parallel to the piston rod for connecting the stop member to one of said components so as to abut with the other of said components thereby to limit the stroke of the ram, wherein the pins are located in some of a group of reception apertures in the said one component, said apertures being spaced around a common pitch circle with its centre on the axis of the piston rod, the total number of apertures exceeding the number of pins to permit the stop member to be angularly oriented around the piston rod into a variety of dispositions.