4000 Switch Machine - Alstom

Lock RodThe lock rod, as shown in Figure 1-2, locks the front rod in position (normal or reverse) andconsists of two rods (curved and straight) that can be adjusted for varying stroke of 6.5 to 3.5inches. The lock rod accommodates right- or left-hand switch machine configurations.The lock rod can be either a wide or narrow notch configuration. A narrow notch will not allowthe machine to lock with a 1/4 inch obstruction, but a wide notch will. The lock rod can also beordered with a threaded or spade end connection.Point Detector RodThe point detector rod, as shown in Figure 1-2, is used to detect the position or movement of theswitch points and consists of three pieces that provide adjustment for varying (3.5 to 6.5 inches)switch machine stroke. The point detector rod can be ordered with a solid (threaded), spade, orthreaded swivel end connection.Cam BarThe split link cam bar, not visible in Figure 1-2, is located under the main drive module andpoint detection modules. The cam bar moves in a machined channel within the switch machinebase plate and is key to the operation of the point detector system. It is the mechanism that, inconjunction with the lock rod, locks the switch points in position. The cam bar also preventsindication while the switch machine is unlocked.The slip link feature allows the cam bar to separate when the cam bar dog interferes with thelock rod, during completion of stroke. When the lock rod is in adjustment, the cam bar willautomatically reset itself.Throw BarThe high strength throw bar, as shown in Figure 1-2, moves the switch points into position. Thelinear movement of the throw bar is generated by the integral cam and the rotary movement ofthe main drive crank. The high wear-resistant nickel plating eliminates the need of lubrication.Cross BraceThe cross brace, as shown in Figure 1-2, is connected to the switch machine housing andsupports the covers. Two cross braces are utilized in the switch machine and can be removedwhen required to give additional access to switch machine components.P2444, Rev. Jan/07 1-8ALSTOM Signaling Inc.