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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 |
| B-5 (a) - Tail Fuze |
| Bombs in which used: Type 3 1/3-kg. antiaircraft. |
| Color: Aluminum. |
| Over-all length: 3 3/8 inches (including tail extension). |
| Over-all widht: 1 5/16 inches. |
| Material of construction: Aluminum. |
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Position and method of fixing in bomb: Tail fuze held under tail cone with vanes and arm-ing spindle protruding perpendicular to side of bomb body. |
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Components of explosive train: Lead azide primer, cyclonite detonator, and TNT-cycloni-te main filler. |
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Fuzes likely to be found with: None. |
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Delay times: None. |
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Description: The fuze body houses an inertia striker which is secured by the arming vane assembly which protrudes from the side of the body. The arming vanes are cup-shaped. A locating pin lines the hole in the striker up with the arming vane hole in the tail assembly for ease in assembly. A spring keeps the striker away from the primer flash cap after the arming vane assembly falls away. The tail assembly hides the fuze to a great extent. |
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Operation: The arming vane assembly unscrews and falls away after the bomb is relea-sed from the container. The spring holds the striker away from the primer while the bomb is falling. On impact, inertia causes the striker to move downward against the spring. The striker pierces the primer and the exploder system is set into operation. |
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Figure 105 – B-5 (a) Bomb Fuze. |
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