Description
The release firing device M1 is a mechanical device designed for firing explosive charges by means of the removal of a restraining load from the device. A restraining load of at least two pounds is required. When the load is removed, a spring lever strikes a firing pin. which detonates a percussion cap. This, in turn, sets off a non-electric cap crimped to the base. This cap detonates the explosive charge. There is a safety pin, and a lever interceptor which serves as a positive safety pin.
The principal parts are the body, a square metal container with a protruding nub threaded to receive the standard firing nipple; the latch; the spring lever; and the firing pin. The latch, when held down against the body by the safety pin or pressure on the box, engages the spring lever and prevents it from firing. The firing pin is held rather loosely in place, having leeway for slight horizontal motion. When the nipple is threaded on, it forces the firing pin back as far as it can go, the firing pin point resting squarely against the surface of the percussion cap.
Functioning
When the device is set with a weight on top and both safety pins removed, it is in an armed condition. If the restraining weight is removed, the latch releases the spring lever. The spring lever will then snap down against the firing pin and drive it into the percussion cap in the standard nipple base, setting off the charge.
Hazardous Components
No information about hazardous components.
See Also
Nothing else to see.
Source(s)
OP 1664, Volume 2 - US Explosive Ordnance (1947)
TM 9-1904, Ammunition Inspection Guide (1944)
