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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 92 - Tail Fuze For Large Bombs B-4 (a) |
| Bombs in which used: |
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Type 3 250, 500- and 1,000-kg. |
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Type 92 250- and 500-kg. |
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Type 92 (special) 250- and 500-kg. |
| Markings: |
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| Color: Natural brass. |
| Over-all length: 5 29/32 inches (less booster). |
| Over-all width: 2 13/32 inches. |
| Material of construction: Brass except steel spring and firing pin. |
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Position and method of fixing in bomb: The fuze is screwed into the bomb and tightened with a spanner wrench. |
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Components of explosive train: A primer fires the Army gaine which detonates the boos-ter. |
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Fuzes likely to be found with: A-4 (a). |
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Delay times: None. |
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Threads: 1 25/32 inches in diameter, 8 per inch. |
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Description: The upper portion of the body houses the arming vane assembly. The arm-ing spindle is threaded at the lower end to screw into the striker which is located in the lower portion of the body. A locating screw causes the spindle to rotate with the arming vanes. Two locating screws keep the striker from rotating as the spindle is unscrewed. The striker is kept away from the primer by a spring. A grub screw holds the body screw-ed into the lower portion. Two holes are present for the U-shaped safety wire. Six span-ner holes are located in the body. The standard Army gaine is surrounded by a booster. |
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Operation: On release from the plane, the arming wire is withdrawn from the holes in the vanes and the latter rotate, unscrewing the spindle from the striker. The vanes will not fall free because they are held on by a locknut on the vane boss collar. On impact, the striker moves downward, and the firing pin enters the primer, overcoming the resistance of the spring. |
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Figure 104 – B-4 (a) Bomb Fuze. |
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