Description: The igniter consists of the housing, firing assembly, and sear lever. The housing is a brass body into one end of which is screwed and soldered a steel base hav-ing a bayonet joint for locking a primer cap and fuze to the assembly. The opposite end of the body is internally threaded to take the hollow closing plug. This closing plug fits over and secures the knurled safety ring and a spring washer which prevents the safety ring from slipping. The safety ring has an internal and external cut-away section. The internal section engages a grub screw on the closing plug, and so limits the distance through which the safety ring can be turned. The external section is beneath the trigger of the sear when it is properly positioned for cocking or firing.

The firing assembly consists of a striker and striker spring within the housing, and a lan-yard eye which is threaded onto the after end of the striker. A lanyard is attached to the lanyard eye.

The sear lever is a steel bar which is pivoted on a double supporting lug attached to the igniter body. One end of the lever bears the sear which passes through a rectangular hole in the igniter body to engage the striker flange when the striker is retracted. The opposite end of the lever is flattened to form a trigger. A spring-loaded plunger is set into a round hole in the body and closing plug. This plunger bears against the trigger keeping the sear depressed. The plunger and spring also lock the closing plug and the body together.

Employment: This device is used to ignite safety fuse and could possibly be used as a pressure igniter for booby traps.

Operation: To cock the device, rotate the safety ring until the external cut-away por-tion is opposite the trigger. A pull on the lanyard will the retract the striker and striker spring. The sear rides over the flange on the striker and is forced to drop in front of the flange by the plunger and spring. The sear then holds the striker and spring is the cocked position. By rotating the safety ring so that its solid portion is beneath the trigger, the firing device is on "Safe" and the trigger cannot be depressed. The device is connected to the primer cap and fuze by means of the bayonet joint in the base.

To fire the device, turn the safety ring so that the cut-away section is beneath the trig-ger. Depressing the trigger disengages the sear from the striker flange allowing the coc-ked striker to move forward and impinge upon the primer.

To render to safe: Turn the safety ring to the "Safe" position and detach the primer and fuze from the bayonet joint in the base of the igniter. Very little pressure is required to depress the trigger.

Figure 189 – Trigger-Type Safety Fuse Igniter.