Railway switch actuating mechanism

Claim 1

IN A RAILROAD SWITCH OF THE KIND WHEREIN A PAIR OF SWITCH POINTS ARE MOVABLE BETWEEN TWO LIMIT POSITIONS WITH RESPECT TO STOCK RAILS BY A THROW ROD INTERCONNECTING THE SWITCH POINTS, MEANS FOR MOVING SAID SWITCH POINTS BETWEEN SAID TWO LIMIT POSITIONS COMPRISING, A CAM MEMBER MOUNTED FOR ROTATION IN OPPOSITE DIRECTIONS ABOUT A FIXED PIVOT, LINK MEANS SECURED FOR ROTATION WITH THE CAM MEMBER AND CONNECTED TO THE THROW ROD TO TRANSLATE ROTARY MOVEMENT OF THE CAM MEMBER INTO LINEAR MOVEMENT OF THE THROW ROD, AND MEANS TO ROTATE THE CAM MEMBER TO THROW THE SWITCH, THE LAST-NAMED MEANS INCLUDING: AN HYDRAULICALLY OPERATED PISTON IN A CYLINDER TO BE MOVED FROM A RETRACTED POSITION IN A FORWARD DIRECTION TO ENGAGE AND ROTATE THE CAM AS AFORESAID IN AN ADVANCED POSITION AND THEREAFTER TO BE MOVED FROM THE ADVANCED POSITION IMMEDIATELY IN A REVERSE DIRECTION BACK TO SAID RETRACTED POSITION IN A SINGLE CYCLE OF OPERATION, CONDUITS CONNECTED TO THE OPPOSITE ENDS OF THE CYLINDER AND ALTERNATELY EFFECTIVE IN SAID CYCLE OF OPERATION TO DIRECT FLUID UNDER PRESSURE INTO ONE END OF THE CYLINDER WHILE CONNECTING THE OPPOSITE END OF THE CYLINDER TO THE HYDRAULIC RESERVOIR FOR PISTON MOVEMENT IN A FORWARD DIRECTION, AND VICE VERSA FOR PISTON MOVEMENT IN THE REVERSE DIRECTION, SAID CONDUITS BEING CONNECTED TO A SOLENOID-TYPE DIRECTIONAL VALVE HAVING A FIRST SOLENOID WHICH, WHEN ENERGIZED, DETERMINES ONE OPERATIVE POSITION OF THE VALVE CORRESPONDING