EMPLOYMENT (used in):

7.5 Geb.G. 36 H.E. projectile.

7.5 KwK. Ster.G. H.E. projectile.

7.5-cm K.Gr.Rot Nb. projectile.

7.5-cm F.H.Gr.Nb. 38 projectile.

7.5-cm F.H.Gr. 41 Nb. projectile.

10-cm Gr. 38 Nb. projectile.

(See fig. 580.)

DATA:

Over-all length: 2.687 inches.

Maximum diameter: 1.687 inches.

Threaded length: 0.625 inch.

Number of threads: 10 RH.

CONSTRUCTION: This fuze is made up in two sections, both aluminum, the cap and the body. To assemble, the cap is screwed into the body and held by a set screw. Under-neath the impact cap is a wooden plunger which rests on an aluminum plug containing a firing pin approximately 1 inch long. This firing pin is pointed downward and is held away from the upper detonator by four centrifugal detents and a spring which is fitted around the firing pin.

This fuze is made of aluminum with the exception some small parts which are made of copper and brass.

ACTION: When the round gains sufficient centrifugal force, the centrifugal detents spread a split ring spring which is wrapped around the blocks. After pivoting outward their maximum distance the blocks lock in place and the fuze is then in the armed posi-tion. On impact the fuze upper detonator compresses the spring and impales itself on the firing pin. Beneath the brass housing containing the upper detonator is a circular alumi-num block which contains two holes. The hole in the center is for instantaneous action and the one on the side has a charge of compressed black powder which is used for the delay element. The center hole is covered by a sliding copper plate which is locked in place for delay action or slides out due to centrifugal force for instantaneous action. Be-neath the aluminum circular block is a large black powder pellet which has a hole through its center and this hole is lined up with the center hole in the aluminum circular block.

Selection of action is accomplished by turning a set screw in the side of the fuze. When the groove in the set screw head points toward O the fuze is set for instantaneous ac-tion and when it point to M and V the fuze is set for 1/10-second delay action. This set screw turns a split hollow shaft inside of which is spring-loaded centrifugal plug. This centrifugal plug holds the sliding copper plate, on top of the aluminum circular block, in place until centrifugal force overcomes the spring and allows the plate to slide from over the center hole if set for instantaneous action. If set for delay action, the split hollow shaft is turned so that the copper plate is locked in place covering the center hole and the split of flame goes through the side hole into the black powder pellet contained be-low.

REMARKS: This fuze is identical in operation with the A.Z. 23/28. It is smaller, a differen-ce chiefly made up in the length of the wooden hammer. There are four centrifugal de-tents in place of five. It is set for delay in the same manner as the other fuze.

The A.Z. 23/28 fuze has the same construction as the A.Z. 23 V nose fuze, the only dif-ference being in the time of delay.

Figure 580 – kl.A.Z. 23