EMPLOYMENT: Meachanical Nose Fuze with self-destroying arrangement for 3.7-cm H.E. shells. (See fig. 564.)

DATA:

Over-all length: 2.0 inches.

Maximum diamter: 1.125 inches.

Length of threads: 0.312 inch.

Number of threads: 5 RH.

CONSTRUCTION: This fuze is essentially the same as the 3.7-cm Kopfzünder Zerl.Pv. (Z.Z. 16) and the 3.7-cm Kpf.Z.Zerl.P. except that the delay in the self-destroying ar-rangement is longer.

ACTION: On acceleration the igniferous detonator in the displaced recess sets back on the striker. The flash from the detonator passes through the flash channels to the pow-der pellet in the radial channel and to the lower end of the delay filling in the first of the vertical channels. When the pellet in the radial channel disintegrates the bolt is thrown outwards by centrifugal force leaving the striker held off from the detonator in the maga-zine by the creep action resulting from deceleration. On impact, the striker is driven in by the hammer and pierces the detonator in the top of the magazine. During flight, the burning of the delay composition in the first vertical channel is transmitted by the gun-powder in the traverse channel to the delay composition in the second vertical channel. When direct cation does not occur before the composition burns to the base of  the se-cond channel, the disk of gunpowder confined to the top of the magazine is ignited and explodes and thus initiates the detonation of the magazine.

Figure 564 – K.Z. 40