Workpiece escapement for runways

Claim 1

AN ESCAPEMENT INCLUDING A BACKPLATE ADAPTED TO BE MOUNTED IN FIXED RELATION TO A RUNWAY ALONG WHICH WORKPIECES TRAVEL, A SLIDE MOUNTED FRO STRAIGHT LINE RECIPROCATION ON THE BACKPLATE, DOGS MOUNTED ON THE SLIDE FOR RECIPROCATION THEREWITH, ONE DOG BEING POSITIONED TO HALT WORKPIECES AT ONE POINT ALONG THE RUNWAY WHEN SAID SLIDE REACHES ONE END OF ITS TRAVEL AND THE OTHER DOG BEING POSITIONED TO HALT WORKPIECES AT ANOTHER POINT ALONG THE RUNWAY WHEN THE SLIDE REACHES THE OPPOSITE END OF ITS TRAVEL, AND MEANS MOUNTED IN FIXED RELATION ON THE BACKPLATE FOR INTERMITTENTLY RECIPROCATING THE SLIDE, SAID MEANS FOR RECIPROCATING THE SLIDE INCLUDING A CYLINDER MOUNTED ON THE BACKPLATE AND HAVING A PISTON THEREIN, A PISTON ROD PROJECTING FROM THE PISTON, MEANS CONNECTING THE PISTON ROD TO THE SLIDE WHEREBY THEY MOVE AS A UNIT, A TIMER CONTROLLED ELECTRICALLY OPERATED VALVE TO WHICH A FLUID PRESSURE SUPPLY LINE IS ADAPTED TO BE CONNECTED, A SEPARATE FEED LINE CONNECTING SAID VALVE TO EACH END OF THE CYLINDER, A FLOW CONTROL VALVE IN EACH FEED LINE, AND SAID ELECTRICALLY