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ALLIED BOMBS AND FUZES |
| PART II - U.S. BOMB FUZES |
| A. ARMY FUZES |
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FUZE DATA |
FILE NO.: |
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NATIONALY: U.S. Army |
INFORMATION DATE: September 1943 |
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DESIGNATION |
PRINCIPAL MARKING |
M 112, M 113, M 114 |
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M 112 |
CLASSIFICATION |
Mechanical Impact-Tail Fuze |
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M 113 |
SPECIAL MISSION |
Masthead Bombing only |
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M 114 |
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DATA |
M 112 |
M 113 |
M 114 |
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1 |
COLOR |
Unpainted Steel |
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2 |
OVERALL LENGTH |
9.6 inches |
11.6 inches |
15.6 inches |
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3 |
OVERALL WIDTH |
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BODY |
2.3 inches |
2.3 inches |
2.3 inches |
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4 |
MATERIAL OF CONSTRUCTION |
Cadmium Plated Steel |
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5 |
PARTS |
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| 1 | Vane Nut | 8 | Inertia Sleeve | |
| 2 | Arming Vanes | 9 | Firing Pin Spring | |
| 3 | Vane Carrier | 10 | Firing Pin | |
| 4 | Arming Stem | 11 | Firing Pin Locking Balls | |
| 5 | Tube | 12 | Creep Spring | |
| 6 | Keyway | 13 | M-16 Primer-Detonator | |
| 7 | Key |
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6 |
POSITION AND METHOD OF FIXING IN BOMB |
Screwed into the base plate of the bomb hand tight. |
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7 |
FUZES LIKELY TO BE FOUND WITH |
Normally used with the M-118 in the nose. |
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8 |
COMPONENTS OF EXPLOSIVE TRAIN |
Primer, compression chamber, igniter charges (2), delay, relay, upper detonator and lower detonator. |
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9 |
ARMING AND FUNCTIONING TIME |
These fuze arm after 20-25 revolutions of the vanes. A se-lective functioning time of 4 to 5 seconds of 8 to 11 se-conds is provided with each fuze by shipping two M-16 pri- mer detonators. Air travel 75 to 100 feet. |
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10 |
OPERATION |
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When the bomb is dropped, the arming wire is withdrawn, permitting the arming vanes (2) to rotate. This rotation is transmitted directly to the arming stem (4), which is unscrewed from the inertia sleeve (8). After 20 to 25 rotations of the vanes a key (7) in the fuze body fits into the keyway (6) in the inertia sleeve (8) and prevents the sleeve (8) from rotating as the arming stem (4) is unscrewed. Thus, the cocked firing pin (10) is held up only by the locking balls (11). The lock-ing balls are held in the inertia sleeve which is held up by a creep spring. On im-pact, the inertia sleeve is forced down against its creep spring (12) until the balls (11) fall back in the recessed portion of the fuze body. This frees the firing pin (10) which sets off the firing train in the primer detonator (13). |
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11 |
REMARKS |
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This fuze will function on impact angle of 3° and gives positive action because of its cocked firing pin. This fuze is unsafe for Carrier landings. Functioning time of 8-11 sec. used against land targets only, 4-5 sec. delay against sea targets. In taking fuze apart remember it has cocked firing pin. For carrier operations, use the AN-M-115, AN-M-116, AN-M-117. |
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