Quantcast Interlock switches

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INTERLOCK SWITCHES.- Interlock switches include a large group of switch types that are actuated manually, by mechanical linkage, or by hydraulic fluid. They act as control or protective devices and are used on all gun mounts and missile launchers.

Sensitive Switches.- The most common type of interlock switch is the sensitive switch. There are various kinds of sensitive switches with different means of actuation.

These are small, short-traveling, snap-action switches (fig. 5-6, view A). They are manufactured as normal] y open, normally closed, and double-throw. The latter has no OFF position. The microswitch is frequently used in referring to this type of switch.

Sensitive switches are usually of the push-button variety and are often used as interlock switches. These switches usually depend on one or more springs for their snap action. For example, the heart of the microswitch is a beryllium copper spring, heat-treated for long life and reliable action. The simplicity of the one-piece spring contributes to the long life and dependability of this switch.

Figure 5-6.-A. Sensitive microswitch; B. Manual push-button switch.

When a sensitive switch is used as an interlock, the plunger (push button) is actuated by mechanical means. The device for moving the plunger can include a rotating cam, lever, wedge, or bellows arrangement.

Sensitive switches of the micro type are also used as manual push-button switches on the control panels for the 5"/54 gun mounts. Figure 5-6, view B, shows a cutaway view of this type of switch. Note that this switch has indicator lamps built into the body of the switch.

Proximity Switches.- Proximity switches, also called Hall-effect switches, are extensively used on gun

Figure 5-7.-Proximity and optical switches.

mounts and missile launchers. These switches (fig. 5-7) are magnetically actuated devices that sense component positions. A typical proximity switch consists of a switch circuit and a housing with a bayonet connector on one end and an epoxied magnetic-sensitive area on the other end. The switch, enclosed in either a straight or a 90-degree switch housing, is normally mounted on a stationary component. The housing has a quick-disconnect bayonet connector that connects the internal circuitry to the gun mount control system cable.

In operation, the switch senses the position of a magnetic field. The magnet, in a protective housing, normally is mounted on a moving component. As the actuator approaches (comes into proximity), the switch actuates; as the actuator departs (not in proximity), the switch deactuates.


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