The Pull firing device M1 is a standard firing device which can be threaded to all of the standard anti-personnel mines, hand grenades, and to the ban-galore torpedo.

GENERAL:

This is a mechanical device designed for firing explosive charges by means of a trip wire. A direct pull of 3 to 5 pounds applied to the ring actuates the device. A spring-driven firing pin sets off the percussion cap, which in turn sets off the non-electric cap crimped to the base. This cap detonates the explosive charge. The new model has two safety pins as shown on the drawing; the old model did not have the positive safety pin.

DESCRIPTION:

The principal parts of this device are the body, release pin, washer, firing pin, and standard nipple base. The split head of the firing pin is forced against pressure of the striker spring through a small opening formed by the shoulders inside the body. The re-lease pin enters into and expands the split head of the firing pin against these shoul-ders, thus preventing its return. The release pin is held in position by the loading spring. Holes in the main head and the release pin permit insertion of a safety pin to prevent accidental movement of the release pin. The main head or upper body is threaded onto the lower body. A short piece of wire is attached at the side to be used in anchoring the device.

The new model differs in that the positive safety pin was added just below the stri-ker, a water-proofing material was added around the nipple of the base, and an anchor cord is used in place of the wire. The head of the body differs slightly in consruction and the joint is soldered to prevent disassembly.

USES:

To activate anti-tank mines or anti-personnel mines, to supplement warning measu-res and to impede advance of enemy troops by running out trip wires connected to anti-personnel mines along a route of probable enemy movement, to set off booby traps, to set off explosive charges instantaneously when electric means are not avail-able, and to prevent removal by enemy of prepared demolition charges or delayed-action mines.

OPERATION:

When the device is set with the blasting cap crimped to the base and inserted in an explosive charge, the top safety pin is removed. After checking the device, the positive safety pin in the lower part of the body is pulled free (new model only), and the device is in an armed condition. A pull of 3 to 5 pounds on the release pin is sufficient to over-comes the resistance of the loading spring and cause the tapered end of the release pin to be withdrawn from within the split head of the firing pin. The split head, no lon-ger being forced against the internal shoulders of the body, slips through under the in-fluence of the striker which drives the striker down on the percussion cap.