BOUGAINVILLE
Well-Known Member
Hi all,
Here is another one of my latest editions to my collection. It is a Japanese Army Type 2 Combination Powder Time & Percussion Fuze. It is in mint condition with only the lid missing from it's shipping can.
TYPE 2 COMBINATION POWDER TIME AND IMPACT FUZE.
Use: Army H. E. projectiles for the 75-mm and 105-mm antiaircraft guns.
Description:
Over-all length: 2 3/32 inches.
Maximum diameter: 3 1/8 inches.
Threaded length: 3/8 inch.
Number of threads: 4, right-hand.
Construction: This fuze is constructed of brass and aluminium. The fuze body, time rings, vent positioning sleeve, and vent locking ring are made of brass, while the vent cap, nose piece, and base plug are of aluminium. The striker extension is wood.
The movable time train has setting markings from 1 to 44 seconds, in half-second intervals.
The vent positioning sleeve separates the time rings from the central fuze body, and vertical grooves in this sleeve allow the gases from the burning time rings to pass off. A key prevents the sleeve from turning, and the upper time ring is also held stationary by a key which threads into the central fuze body.
The vent locking ring threads on the central fuze body and secures the time rings and the sleeve. It is held off the upper ring by belleville springs. The ring is further secured by a grub screw.
The vent cap threads onto the upper time ring and contains holes for the escape of gases.
Contained in the nose cap is the complete impact firing mechanism, consisting of a wooden striker extension, striker, centrifugal detent, detent spring, and primer cap. A copper closing disc in the top of the head prevents the striker being forced down on to the detonator by air pressure during flight.
The fuze body has two longitudinal flash channels through its central part to allow the flash from the impact primer to ignite the black-powder magazine in the base. The time firing-pin safety spring, and time primer cap are also housed in the central fuze body. A transverse hole in the body between the time firing mechanism and the upper time ring allows the flash of the primer cap to ignite the upper time ring.
The fuze is stored with a protective cap screwed on the fuze body just below the lower time ring.
Safety Devices:
When set safe" the lower ring is masked from the top ring and so if the shell is fired, only the top ring will burn. The striker spring is relatively strong compared with the light striker, so only a very heavy drop would fire the time detonator.
Centrifugal Detent:‑ This is held by its spring under the head of the firing pin and prevents the latter from impinging on the detonator until the centrifugal force is sufficient to move it outwards against its spring.
Closing Disc: ‑ This prevents air pressure driving the striker and firing pin on to the detonator during flight.
Operation:
Time: Set-back initiates the time striker. Because of four longitudinal grooves in the striker, the flash escapes to and through the transverse opening to the upper powder ring. From the lower powder ring a black powder flash channel ignites the black powder magazine in the base.The direction of burning of the rings is:‑
Top ... Anticlockwise
Bottom ... Clockwise
Impact: The detent moves from under the striker with centrifugal force. On impact the nose is crushed, driving the striker onto the primer cap. The flash passes through the flash channel in the central fuze body to the black-powder magazine in the base.
Hope you all enjoyed that.
Cheers,
BOUGAINVILLE
Here is another one of my latest editions to my collection. It is a Japanese Army Type 2 Combination Powder Time & Percussion Fuze. It is in mint condition with only the lid missing from it's shipping can.
TYPE 2 COMBINATION POWDER TIME AND IMPACT FUZE.
Use: Army H. E. projectiles for the 75-mm and 105-mm antiaircraft guns.
Description:
Over-all length: 2 3/32 inches.
Maximum diameter: 3 1/8 inches.
Threaded length: 3/8 inch.
Number of threads: 4, right-hand.
Construction: This fuze is constructed of brass and aluminium. The fuze body, time rings, vent positioning sleeve, and vent locking ring are made of brass, while the vent cap, nose piece, and base plug are of aluminium. The striker extension is wood.
The movable time train has setting markings from 1 to 44 seconds, in half-second intervals.
The vent positioning sleeve separates the time rings from the central fuze body, and vertical grooves in this sleeve allow the gases from the burning time rings to pass off. A key prevents the sleeve from turning, and the upper time ring is also held stationary by a key which threads into the central fuze body.
The vent locking ring threads on the central fuze body and secures the time rings and the sleeve. It is held off the upper ring by belleville springs. The ring is further secured by a grub screw.
The vent cap threads onto the upper time ring and contains holes for the escape of gases.
Contained in the nose cap is the complete impact firing mechanism, consisting of a wooden striker extension, striker, centrifugal detent, detent spring, and primer cap. A copper closing disc in the top of the head prevents the striker being forced down on to the detonator by air pressure during flight.
The fuze body has two longitudinal flash channels through its central part to allow the flash from the impact primer to ignite the black-powder magazine in the base. The time firing-pin safety spring, and time primer cap are also housed in the central fuze body. A transverse hole in the body between the time firing mechanism and the upper time ring allows the flash of the primer cap to ignite the upper time ring.
The fuze is stored with a protective cap screwed on the fuze body just below the lower time ring.
Safety Devices:
When set safe" the lower ring is masked from the top ring and so if the shell is fired, only the top ring will burn. The striker spring is relatively strong compared with the light striker, so only a very heavy drop would fire the time detonator.
Centrifugal Detent:‑ This is held by its spring under the head of the firing pin and prevents the latter from impinging on the detonator until the centrifugal force is sufficient to move it outwards against its spring.
Closing Disc: ‑ This prevents air pressure driving the striker and firing pin on to the detonator during flight.
Operation:
Time: Set-back initiates the time striker. Because of four longitudinal grooves in the striker, the flash escapes to and through the transverse opening to the upper powder ring. From the lower powder ring a black powder flash channel ignites the black powder magazine in the base.The direction of burning of the rings is:‑
Top ... Anticlockwise
Bottom ... Clockwise
Impact: The detent moves from under the striker with centrifugal force. On impact the nose is crushed, driving the striker onto the primer cap. The flash passes through the flash channel in the central fuze body to the black-powder magazine in the base.
Hope you all enjoyed that.
Cheers,
BOUGAINVILLE
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