# US 4,399,962 A · Wobble nose control for projectiles

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- Number: US 4,399,962 A
- Document ID: US4399962A
- Status: Granted
- Kind: A
- Application number: 06/298,128
- Filed: 1981-08-31
- Granted: 1983-08-23
- Earliest claimed: 1981-08-31
- Assignees: General Dynamics, Pomona Division
- Inventors: Larry D. Wedertz; Byron M. Niemeier; Oakley G. Ross
- Web page: https://patentgrep.com/patent/US4399962A

## CPC

- F42B 10/62: Steering by movement of flight surfaces
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

An articulated nose is locked in axial alignment with the longitudinal axis of a rolling projectile body. Pyrotechnic means within the nose is actuated to unlock the nose and tilt it toward the target when the error between the projectile path and the path to the target exceeds a predetermined threshold.

## Claims

### Claim 1

A wobble nose projectile for launching at a target and having a cylindrical body that is rotatable in flight, comprising:
an articulated nose connected to the forward end of said projectile body and locked in axial alignment with the longitudinal axis of the said projectile body; and
pyrotechnic means within said nose for unlocking the nose and tilting said nose toward the target when the directional error of the projectile exceeds a threshold.

### Claim 2 (depends on 1)

A wobble nose projectile according to claim 1 wherein the nose is pivotal about an axis that is transverse to the longitudinal axis of the projectile body; and
said pyrotechnic means comprises pyrotechnic elements within said nose on both sides of said transverse axis and arranged for selective ignition according to the direction of the error in the flight path of the projectile.

### Claim 3 (depends on 2)

A wobble nose projectile according to claim 2 wherein said pyrotechnic elements include cylinders within said nose, a piston contained within each cylinder and a detonating charge in the cylinder behind said piston, the free end of said piston extending toward the forward end of said projectile body;
said piston extending against the forward end of said projectile body to tilt the nose relative to said body when said charge is detonated.

### Claim 4 (depends on 3)

A wobble nose projectile according to claim 3 wherein said transverse pivot axis is formed by rod means on said nose extending through slot means in the projectile body.

### Claim 5 (depends on 4)

A wobble nose projectile according to claim 4 wherein a space is provided between said nose and the forward end of said projectile body and said locking means is locked at the outer periphery of said space;
said locking means being removed by the gas from the ignition of said pyrotechnic pistons.

### Claim 6 (depends on 3, 4)

A wobble nose projectile according to claims 3 or 4 wherein said cylinders are provided in banks so that they are located in various radial positions relative to the longitudinal axis of the projectile body.

### Claim 7

A wobble nose projectile for launching at a target and having a longitudinal body that is rotatable in flight, comprising:
as articulated nose having transverse rod means positioned in a slot at the forward end of said projectile body and positioned with a space between said nose and said projectile body;
locking means positioned at the outer periphery of said space, for locking said nose in axial alignment with the longitudinal axis of said projectile body;
a plurality of cylinders positioned within said nose on both sides of said rod means with a piston contained within each cylinder and a detonating charge in the cylinder behind said piston, the free end of said piston extending toward the forward end of said projectile body; and
ignition means within said nose for selectively firing one or more of said pyrotechnic cylinders and removing said locking means, the piston in said ignited cylinder extending to contact the forward end of said projectile body to tilt said nose toward the target when the directional error of the projectile exceeds a threshold.