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| U.S. EXPLOSIVE ORDNANCE |
| PART 6 - BOMBS AND BOMB FUZES |
| Chapter 20 - BOMB FUZES |
| Section 2 - ARMY-DESIGNED BOMB FUZES |
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AN-M128, AN-M145, AN-M146, and AN-M147 (Nose Clockwork Aerial Burst) |
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Bombs |
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AN-M128 |
Cluster, Incendiary, AN-M17A1 |
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AN-M145 |
Cluster Adapter, Incendiary, E6R2 |
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AN-M146 |
Flares and photoflash; Butterfly Clusters M28 and M29 Target Identification Bombs M89, M90, M98 |
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AN-M147 |
Target Identification Bomb M84; Incendiary AN-M47A2, A3 |
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Functioning |
Aerial burst, 5 -92 seconds; or instantaneous |
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Armed condition |
When safety collar and arming pin are both out, and deto-nator is aligned under firing pin |
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Fuzes used with |
None for M128, M146 and M147; M152 or M153 used with M145 |
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Arming time |
Approximately 260 vane revolutions |
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Vane span, inches |
3 |
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Body diameter, inches |
1.63 |
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Over-all lenght, inches |
AN-M128, AN-M145 - 6.2; AN-M146 - 5.67; AN-M147 - 5.72 |
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Material |
Aluminum alloy body with zinc- or cadmium-plated steel striker |
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General: These fuzes modify the Nose Clockwork Aerial Burst Fuze M111A2 by the addition of a detonator slider held out of line until the fuze is partially armed by a crank-shaped arming stem. The four fuzes in the series are indentical, except for the boosters employed; the AN-M128 has the booster of the M127 (tetryl); the AN-M145, that of the M138 (tetryl-clay pellet); the AN-M146, that of the M111A2 (black powder); and the AN-M147, the AN-M126A1 primer detonator, instead of a booster. |
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Operation: Same as M111A2, except that, after approximately four seconds of rota-tion of the timing disc, the release arm located below the timing disc, and tunring with it, frees the crank-shaped end of the arming stem. The lower end of the arming stem then presents its cut-away section to the detonator slider, which will then align itself below the firing pin and become locked in place there by a spring-loaded detent. |
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When the detonator is aligned, the timing disc continues to turn. After the predeter-mined time has eleapsed, the slot in the timing disc will be positioned opposite the tim-ing-disc lever. Through a series of levers, pressure forces this timing-disc lever into the slot, thus freeing the firing lever. This, in turn, frees the half-round cocking pin, which is forced to rotate under pressure of the spring-loaded firing pin. As the half-round cocking pin rotates, the firing pin is released and impinges on the primer, firing the booster. |
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Remarks: The AN-M128 replaces the M127; AN-M145 replaces the M138; and AN-M146 replaces the M111A2. |
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These fuzes are equipped with a spinner device to force the safety block to rotate with the arming vane; this assures positive ejection of the safety block after the arming sleeve has withdrawn. |
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Figure 337. Aerial Burst Fuze AN-M128 |
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