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ALLIED BOMBS AND FUZES |
| BRITISH FUZES |
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FUZE DATA |
FILE NO.: 2225.N10 |
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NATIONALY: BRITISH |
INFORMATION DATE: February 1944 |
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DESIGNATION |
PRINCIPAL MARKING |
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Fuze No. 845 |
CLASSIFICATION |
Anti-Disturbance Nose Fuze |
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Mks. I & II |
TYPE OF MISSILE |
G.P.H.E. Bombs |
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MARKINGS: |
845/I or 845/II |
BOMBS USED IN: |
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Stamped on vane. |
250 & 500 lb. Mk. IV G.P. |
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1000 & 1900 lb. Mk. I G.P. |
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LEGEND |
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1 |
Arming vanes |
8 |
Spring-loaded plunger |
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2 |
Arming spindle |
9 |
Igniter bridge |
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3 |
Seating spring |
10 |
Plastic delay washer |
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4 |
Cone |
11 |
Electric contact |
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5 |
Dry cell |
12 |
Mercury switch |
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6 |
Inertia ring |
13 |
Gunpowder pellets |
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7 |
Retaining ball |
14 |
Sleeve |
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COLOR |
Unpainted steel. |
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OVERALL LENGTH |
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OVERALL WIDTH |
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MATERIAL OF CONSTRUCTION |
Steel. |
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DESCRIPTION |
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The fuze consists of a body, nose, arming vanes (1) and an electric battery cicuit. The nose is threaded to receive the arming spindle (2) which is keyed to the vanes (1). A small cone (4) rests under the spindle (6) seats around the cone. A cavity leads from the cone to the spring-loaded delay plunger (8). A retainer ball (7), fits into this cavity and is held in the slot of the delay plunger so long as the cone (4) is in place. A plastic delay washer (10) lies under the plunger (8). Below this is an electric contact (11). The electric circuit runs from a 1.5 volt cell in the side of the fuze, thru the delay plunger (8). The plunger contact (11) is wired to a mercury switch (12) and an igniter bridge (9) and thence to the dry cell (5). |
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OPERATION |
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When the bomb is dropped, the vanes (1) rotate until the butt of the spindle (2) comes against the threads. The velocity of the vanes at this point suffices to break the spind-le off at the weakened portion. The cone (4) is now free to move against the seating spring (3) when the bomb strikes the target. This movement allows the plunger (8) to force the retaining ball (7) free of its slot. The plunger (8) is the forced down thru the delay washer (10) finally making contact with the contact piece (11). The fuze is now armed and any appreciable movement of the bomb will close the sensitive mercury switch (12), thereby firing the gunpowder pellets (13) which lead to the detonator. |
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POSITION & METHOD OF FIXING IN BOMB |
Screwed into the nose of the bomb. |
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FUZES LIKELY TO BE FOUND WITH |
No. 37 Mks I, II, III or IV Long Delay Tail Pistol. |
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COMPONENTS OF EXPLOSIVE TRAIN |
Igniting cap, gunpowder pellets and detonator No. D.38. |
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ARMING TIME |
20 seconds after impact. |
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REMARKS |
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The Mk I differs from the Mk II in that the Mk II has a shorter nose and it has a spring type safety fork. |
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BRITISH DESIGNATION |
Fuze, Aircraft Bomb, Nose, No. 845 Mk I or II. |
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