|
|
| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 2 – Section 1 |
| Army Bomb Fuzes |
| Type 1 - Instantaneous Fuze A-2 (d) |
| Bombs in which used: |
|
Type 92 15-kg. |
|
Type 100 50-kg. incendiary. |
|
Type 100 50-kg. gas. |
| Color: Natural brass. |
| Over-all length: 2 inches. |
|
Over-all width: 1 9/16 inches; vane span 3 3/8 inches. |
|
Material of construction: Brass except for light metal striker-primer assembly. |
|
Position and method of fixing in bomb: The fuze is screwed into the nose fuze pocket and is usually secured in place by a grub screw. |
|
Components of explosive train: The primer is housed in the fuze body. The remainder of the explosive train is contained in the gaine. |
|
Fuzes likely to be found with: Probably none; however, it may be used in bombs that can be fitted with a tail fuze. |
|
Delay time: None. |
|
Threads: 1 5/32 inch diameter, 13 threads per inch, RH. |
|
Description: The fuze body is of one piece brass construction. The upper portion of the body is threaded externally to receive the arming vanes. The lower portion is threaded internally to accommodate an Army type gaine and threaded externally to fit a fuze poc-ket. |
|
The fuze body contains the striker-primer assembly. This consists of a light metal striker-primer housing, striker, primer, spring, light metal cup, washer, and copper shear wire. The striker is secured to a disk which rests on the shoulder of the tubular striker-primer housing. The metal cup fits inside of the housing and its edges bear against the striker disk. The copper shear wire holds the entire assembly in position. The primer is in the base of the housing and is held there by a winged washer which fits into the slots in the side of the housing. A spring separetes the washer and the striker disk. |
|
A bajonet joint on the inside of the fuze body accommodates the wings of the washer in assembling the fuze. After being inserted, the striker-primer housing is rotated 90° before it is secured in place. |
|
Operation: When the bomb is released from the plane the arming wire is with-drawn, the vanes rotate and fall free. Upon impact with a solid object the copper wire is sheared and the striker-primer assembly moves down and bears against the bayonet joint. At the same time inertia causes the primer and washer to move forward against the spring, the primer hits the striker and is fired. |
|
Remarks: The striker-primer assembly in this fuze is an exact copy of the Remondy me-chanism used in French fuzes. |
|
Figure 95 – A-2 (d) Bomb Fuze. |
|
|
 |
