TM 9-1375-213-12
method of installation.
(b) Bury and anchor assembled mine and
pressure cap. Firing pin should strike nipple end of
coupling base sharply, indicating proper functioning
firing device on a firm flat foundation.
of firing mechanism.
(c) Place or arrange some suitable object,
such as a pressure board, in contact with, but not
(c) Recock firing mechanism by pushing
firing pin inward with unsharpened end of a pencil or
bearing on, pressure cap. If the particular object
a small blunt rod and, at the same time, pressing
does not touch pressure cap, screw extension rod
into pressure cap and adjust by unscrewing rod until
downward on pressure cap, so that end of firing pin
it is snug against object and then backing rod away
can pass through enlarged portion of keyhole in
one quarter turn to relieve any pressure on pressure
firing pin release pin.
cap. If tri-pronged pressure head is to be used, screw
(d) Release pressure on pressure cap to allow
it into pressure cap and adjust in same manner.
narrow part of keyhole to engage groove on spindle.
Extension rod and tri-pronged pressure head are
(e) Replace safety pin and safety fork. Safety
pin and safety fork should be free enough for easy
(d) Remove safety fork. It should pull off
removal after firing device has been installed.
easily. A sudden jerk may cause firing device to
(f) S c r e w c o u p l i n g b a s e i n t o f i r i n g
mechansim handtight. This restores firing device to
function. If safety fork does not pull off easily, check
original condition.
installation to make sure there is no pressure on
(2) Installation and arming.
pressure cap.
(a) Remove protector tube from nipple, crimp
(e) Using attached cord, pull out safety pin
a nonelectric blasting cap on nipple, and then screw
slowly and carefully. If safety pin resists a
firing device, with safety fork and safety pin in
place, into a mine or other explosive charge.