47. Pull Fuze For Egg Grenades (Brennzünder Ei; B.Z.E.)

a. Description. The pull fuze for egg grenades consists of two types, the friction type and the spring-loaded type.

(1)

Friction type. The friction type pull fuze (fig. 47) is a delay, frcition, chemical type. It is housed in a cylindrical metal case containing a coated pull wire leading through, and coiled below a chemical compound. The fuze is 2 1/8 inches long and 7/16 of an inch in diameter. A delay pellet may be screwed onto the base of the fuze. A round, knob-shaped pull cap is screwed onto the top of the fuze and is at-tached by a pull disk and a pull cord to the coated pull wire. The pull cap of the fuze may be painted one of four colors, indicating the length of the delay time, in seconds, of the delay pellet:

Red: 1-second delay.

Gray or pale blue: 4 1/2-second delay.

Yellow: 7 1/2 to 9-second delay.

White: 10-second delay.

A hexagonal nut is normally screwed cap. Some models, however, are provided with a wing-shaped nut (fig. 48) with the wings pointing upward.

Figure 47. Friction type pull fuze for egg grenades.

(2)

Spring-loaded type. The spring-loaded type pull fuze (fig. 48) is identical to the friction type externally. It differs internally in that it contains a flat, metal spring-loaded striker, and the fuze usually has a wing-shaped nut screwed on the top. The pull cap of the mechanical fuze is colored a deep blue.

b. Employment.

(1)

The fuze with the red pull cap is used with the German message-box smoke flare.

(2)

The pale-blue or gray-capped fuze is normally used in the egg concussion grenade and the shaving-stick grenade.

(3)

The yellow- and white-capped fuzes are use in hollow or prepared charges.

(4)

The fuze with the deep-blue colored pull cap is normally used in the egg concussion grenade.

c. Functioning.

(1)

Friction type. When the pull cap is unscrewed and the pull cord given a sharp pull, the coated pull wire is pulled through and ignites the chemical compound. The flame ignites the powder in the delay pellet which then fires the detonator.

(2)

Spring-loaded type. When the pull cap is unscrewed and the pull cord given a sharp pull, the striker shaft is pulled upward compressing the striker spring. When the stri-ker latch is sufficiently clear of the fuze case it disengages itself from the slot in the end of the striker shaft, releasing the striker against the percussion cap. The exploding percussion cap ignites the powder in the delay pellet which, in turn, fires the detonator.

d. Installing and Arming. Before using these fuzes, make sure the delay pellet is in the base of the fuze and has not been burned out. These fuzes all have right-hand threads on the pull caps to differentiate them at night from the fuze lighter 39 (par. 49), which has left-hand threads. Trip wires may be attached to the pull caps of these fuzes.

Figure 48. Spring-loaded type pull fuze for egg grenades.

e. Neutralizing. Since there are no safety devices on any of these fuzes neutralization consists of unscrewing the fuze from the grenade or charge.