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| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 2 – Section 1 |
| Army Bomb Fuzes |
| Type 12 - Year Tail Fuze B-1 (a) |
| Bombs in which used: |
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Type 94 50- and 100-kg. |
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Type 94 50- and 100-kg. (special). |
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Type 3 50- and 100-kg. |
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Type 1 and 2 30-kg. (substitute). |
| Markings: |
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| Color: Neutral brass. |
| Over-all length: 2 27/32 inches (less booster). |
| Over-all width: 1 9/16 inches. |
| Material of construction: Brass, except steel spring and firing pin. |
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Position and method of fixing in bomb: Fuze is screwed into tail of bomb and tightened with a spanner wrench. |
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Components of explosive train: Primer, standard Japanese Army tail gaine and booster. |
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Fuzes likely to be found with: A-2 (a), A-2 (c) or possibly A-2 (b). |
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Delay times: None. |
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Threads: 1 5/32 inches in diameter, 13 threads per inch. |
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Description: The fuze body houses the arming vane assembly which is secured by a U-shaped wire. The firing pin is screwed into the striker spindle and is kept away from the primer by a spring. Six spanner holes are present, along with a hole for shear wire. No shear wire is fitted. However, a locating pin prevents the striker spindle from rotating with the vanes. A sleeve permits the tail booster to be connected to the body. Stop studs are found on the vane cup and on the fuze body to prevent the vanes from being screwed down too tightly. |
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Operation: On release from the plane, an arming wire is withdrawn form the holes in the vanes, allowing the latter to rotate and fall free. On impact, the firing pin is forced in-ward against the action of the spring to pierce the primer and set off the exploder sys-tem. |
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Figure 102 – B-1 (a) Bomb Fuze. |
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