ROCKET USED IN

FUNCTIONING

ARMED CONDITION

FUZES USED WITH

ARMING TIME

MAX. BODY DIAMETER

OVERALL LENGTH

4.25"

GENERAL:

This fuze is designed for anti-submarine warfare and is used in rockets projected both from airplanes and small patrol craft. The fuze functions on impact with a hard ob-ject but not on water impact.

The fuze body encloses the functioning mechanism. A water-proof cap is affixed to the nose of the fuze and is held in position by two bands lockes by a safety pin. Be-neath the cap, a firing wheel is attached by a set-screw to the end of a firing pin. This wheel is formed like a cross to present less surface and prevent firing on water impact. The slide stop pin,  riveted to the cap, engages a leg of the firing wheel. This pin also extends down into the nose plate, where it prevents a slide from moving outward. A flywheel and setback collar, seperated by a spring and secured by the flywheel screw, form a sub-assembly. This assembly is placed on the shaft of the firing pin. A pin set in the slide engages the setback collar in order to prevent its rotations. A clock spring, secured on one end to the flywheel and on the other end to a pin on the closure disc, is assembled under tension so as to impart its force to the flywheel. The pin to which the clock spring is attached is anchored to the fuze body to prevent roatation of the closure disc. The firing pin is screwed into shear threads in the closure disc. A detona-tor shutter is affixed on a pin set in the lower surface of the closure disc. The firing pin extends into a cavity in the shutter. A tightly fitting spacer ring set in the body main-tains a spring detend housed in the detonator shutter. This ring, interposed between the closing disc and lead-in disc, provides free movement of the shutter. The lead-in charge is contained in the lead-in disc, and the booster charge in a booster magazine which screws into the fuze body.

OPERATION:

When the arming wire is withdrawn as the rocket is launched, the clamps are un-locked and forced off by the clamp spring. The waterproof cap flies off by the action of its compressed springs. Setback causes the setback collar to move back against its spring. This movement releases the slids pin in the nose cap, permitting the flywheel assembly to be rotated by the force of the clock spring. This rotation is transmitted to the firing pin, causing it to screw outward, thereby withdrawing the firing pin from en-gagement with the detonator shutter, which is forced by its spring into alignment with the firing pin. Once the shutter moves into the armed position it is locked by a spring-loaded detent.

On impact of the firing wheel with a solid object, the firing pin is driven backward and shears the shear threads of the closure disc. It the pierces the detonator, setting off the explosive train.

REMARKS:

This fuze is now obsolete.