# US 4,393,781 A · Fuze for liquid shell propellants

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- Number: US 4,393,781 A
- Document ID: US4393781A
- Status: Granted
- Kind: A
- Application number: 05/337,093
- Filed: 1973-02-26
- Granted: 1983-07-19
- Earliest claimed: 1972-04-13
- Assignees: Rheinmetall GmbH
- Inventors: Manfred Graf
- Web page: https://patentgrep.com/patent/US4393781A

## CPC

- F42C 19/085: Primers for caseless ammunition
- F41A 1/04: Missile propulsion using the combustion of a liquid, {loose powder} or gaseous fuel, e.g. hypergolic fuel
- F42C: AMMUNITION FUZES (blasting cartridge initiators F42B3/10; chemical aspects C06C); ARMING OR SAFETY MEANS THEREFOR (filling fuzes F42B33/02; fitting or extracting primers in or from fuzes F42B33/04; containers for fuzes F42B39/30)
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE

## Abstract

A fuze for the firing of a projectile from a gun barrel comprises a breech piece threaded onto the rear end of the barrel and defining therewith a cylindrical chamber for a charge of liquid propellant to be tangentially introduced upon insertion into the barrel of the projectile to be fired. A pyrotechnical detonator is carried on the aft end of the projectile and extends rearwardly therefrom into the chamber when the projectile is thus emplaced, with the injected propellant circulating around it. The projectile is discharged upon ignition of the detonator by a firing pin. The pin is guided in a plunger surrounded by a retractable sleeve which serves to position the shell in the barrel by engaging an area of its aft end surrounding the detonator.

## Claims

### Claim 1

A fuze for firing a projectile from a gun barrel, comprising:
a pyrotechnical detonator disposed at the aft end of a projectile to be fired, said detonator having a diameter less than the caliber of said projectile;
a breech piece secured to the rear end of the gun barrel and defining therewith a charge chamber centered on an axis;
positioning means for emplacing said projectile in said gun barrel with said detonator extending rearwardly into said charge chamber along said axis, said breech piece being provided with at least one conduit opening tangentially into said charge chamber for injecting a liquid propellant into same with circulatory motion around said detonator; and
igniting means for setting off said detonator in the presence of the circulating propellant.

### Claim 2 (depends on 1)

A fuze as defined in claim 1 wherein said positioning means comprises a tubular member slidable along said axis and engageable with an area of said aft end surrounding said detonator.