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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 1 - 15-Second Delay Fuze B-1 (b) |
| Bombs in which used: |
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Type 92 250- and 500-kg. (and special). |
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Type 94 50- and 100-kg. (and special). |
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Type 3 50-, 100-, 250-, 500-kg. |
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Types 1 and 2 30-kg. substitute. |
| Markings: |
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| Color: Natural brass. |
| Over-all length: 5 13/32 inches (less booster). |
| Over-all width: 1 9/16 inches. |
| Material of construction: All brass except spring and firing pin. |
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Position and method of fixing in bomb: Screwed into tail cone with spanner wrench fitting in holes. |
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Components of explosive train: Flash cap, delay train, black powder relay, standard Army gaine, and picric booster. |
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Fuzes likely to be found with: Will generally be used alone; however, bombs are designed to use and may have nose fuze. |
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Delay times: 15 seconds. |
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Threads: 1 5/32 inches in diameter, 13 threads per inch. |
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Description: Upper fuze body houses striker assembly, the upper end of which is thread-ed for the arming vanes which are prevented from rotating during shipment by a U-sha-ped safety fork fitting into holes. A locating pin fits into the groove in the striker spindle preventing rotation during arming time. The lower fuze body contains primer flash cap, delay train, flash channel and black powder relay. The spring prevents the striker from moving down on the primer flash cap after fuze is armed. |
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Operation: On release, arming wire is withdrawn allowing vanes to rotate and fall free in eleven turns. On impact, the firing pin moves in against the spring and pierces the cap. The flash passes through channel and ignites delay train, the gas from burning powder escaping through escape hole. The delay train burns around the periphery to flash chan-nel, ignites powder relay, which in turn sets off the gaine and booster. |
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Figure 103 – B-1 (b) Bomb Fuze. |
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