Device for effecting translational movement of a machine
AssigneeCharbonnages de France
InventorAlfred A. M. Valantin
Life of this patent
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Abstract
A hauling device, for example for a mining machine, has two clamping elements which grip on ramps each of which elements is attached to an operating rod of a hauling jack. The jacks are operated alternately, in conjunction with the clamping elements to advance or retract the machine, and the hauling jacks are hydraulically interconnected in a manner to avoid hunting.
Claims7
A device for effecting translational movement of a machine comprising two anchoring elements for alternately supporting the machine, hauling jacks respectivey connected to the anchoring elements for hauling the machine, each hauling jack including a first hydraulic cylinder, a hydraulic connection for interconnecting the first cylinders in series, the first cylinders having the same effective volume, said hydraulic connection comprising a second hydraulic cylinder including a free-piston reciprocable therein, said second cylinder having at least the same effective volume as each of the first cylinders, a source of hydraulic fluid, means for hydraulically coupling said source to one of said first hydraulic cylinders for operating said hauling jacks in one direction, an end-of-stroke detector for detecting the end of a useful stroke of said free piston and means connected to said end-of-stroke detector for moving said coupling means to a position wherein the source is coupled to another of said first hydraulic cylinders for operating said hauling jacks in a direction opposite to said one direction.
Dependencies are inferred from the claim text.