Railroad switch stands

Claim 1

APPARATUS FOR SHIFTING THE SWITCH POINTS OF A RAILROAD SWITCH BETWEEN TWO LIMIT POSITIONS AND COMPRISING: A MANUALLY OPERABLE SWITCH STAND INCLUDING OVER-CENTER LINKAGE MEANS CONNECTED TO SAID SWITCH POINTS FOR SHIFTING SAID SWITCH POINTS BETWEEN THE TWO LIMIT POSITIONS, SAID OVER-CENTER LINKAGE MEMBERS HAVING A SPRING EXERTING A BIASING FORCE FOR MAINTAINING SAID SWITCH POINTS IN EACH OF THE LIMIT POSITIONS; POWER MEANS CONNECTED TO SAID SWITCH POINTS AND OPERABLE TO MOVE SAID OVER-CENTER LINKAGE MEANS PAST DEAD CENTER WHEREBY SAID SWITCH STAND IS OPERABLE TO SHIFT THE SWITCH POINTS TO A LIMIT POSITION AND TO EXERT A BIASING FORCE FOR MAINTAINING THE SWITCH POINT IN A LIMIT POSITION; SAID POWER MEANS INCLUDING CAM MEANS MOUNTED FOR ROTATIONAL MOVEMENT ABOUT A PIVOT AXIS FIXED IN POSITION WITH RESPECT TO THE RAILWAY SWITCH, LINK MEANS INTERCONNECTING SAID CAM MEANS AND SAID SWITCH POINTS AND BEING ROTATABLE WITH THE SWITCH POINTS FOR MOVING THE SWITCH POINTS IN A DIRECTION DEPENDENT UPON THE DIRECTION OF THE ROTATION OF THE CAM MEANS, AND REMOTELY ACTUATABLE MEANS INCLUDING A PUSH ROD NORMALLY SPACED FROM SAID CAM MEANS SO THAT THE SWITCH POINTS ARE SHIFTABLE BY THE MANUALLY OPERABLE SWITCH STAND WITHOUT RESTRICTION BY SAID PUSH ROD, SAID PUSH ROD BEING ENGAGEABLE WITH THE CAM MEANS UPON ACTUATION OF THE REMOTELY ACTUATABLE MEANS TO MOVE SAID SWITCH POINTS THROUGH SAID LINK MEANS SHORT OF EACH ONE OF SAID LIMIT POSITIONS AND TO MOVE SAID OVER-CENTER LINKAGE MEANS OVER THE DEAD CENTER POSITION WHEREBY SAID SPRING-BIASED OVER-CENTER LINKAGE MEANS MOVES SAID SWITCH POINTS TO A LIMIT POSITION AND EXERTS A BIASING FORCE FOR MAINTAINING THE SWITCH POINTS IN SAID LIMIT POSITION.