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‘ wt. E5, 1946..
2,409,205
R, L.. GRAUMANN
BOMB FUSE
Filed Marèh 2, 1932
2 Sheets-Sheet 2
27
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Patented Cct. 15, 1946
narran stares PATENT OFFICE
2,409,205
BOMB FUSE
Raymond L. Graumann, Alexandria, Va.
Application March 2, 1932, Serial No. 596,364
7 Claims. (Cl. 102-8L2)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757 )
l
This invention relates to bomb fuses, and more
particularly to fuses for bombs launched from
aircraft in which the fuse is armed by the action
of the air on a propeller.
The objects of this invention are, first, to pro
vide a fuse that has sufñcient delay action that
it will not arm until after it is clear of the air
plane;
Second, to provide a fuse that has instantane
ous action ‘on impact;
pin IS so that the propeller and shaft may again
turn. The shaft will advance relative to the fuse
body until shear pin collar 24 rests against the
top of housing 25. Thereafter, the arming nut
I8 will move outward relative to the fuse body.
Resistance to turning of the shaft is small, due
to the ball race 12| which has a stationary part
resting against spring I'I and a moving part
pinned to the shaft with the balls in between. , If
10 at any time the pressure on the propeller and hub
is reduced below that required to compress the
Third, to provide a fuse that will automatically
spring Il, the shaft will be forced outward so that
disarm at a predetermined reduced air speed;
the stop pins l5 and I6 again strike and further
Fourth, to provide a fuse that, after arming, so
rotation is prevented. However, during the con
locks the arming mechanism that after disarming
15 tinued rotation of the shaft, arming nut I8 ad
at a reduced air speed, it cannot be re-armed;
varices until it strikes collar 23, when guide pins
Fifth, to provide a fuse that is easily removed
'I9 are clear of the slots in the arming nut guide
from the bomb and is safe during shipping; and
2li, and the firing pin 28 is clear of the arming
Sixth, to provide a fuse that is safe from acci
nut,
but rotor arming pin 2'6 carried outward by
dental firing.
’
With the above and other objects in view, this 20 nut it is still projecting slightly into detonator
rotor ‘.il,Fig. 6, and further rotation of the shaft
invention consists of such construction and ar
carries the arming nut with it and they move un
rangement of parts as will be more fully described
til guide pins I9 rest against the shoulders on the
hereinafter in connection with the accompanying
top of the arming nut guide, Fig. 5. In this posi
drawings, in which:
.
Fig. 1 shows the fuse in the unarmed condition; 25 tion the guide pins are above slots 29 which permit
suiiicient movement of the arming nut to fire the
Fig. 2 is a cross-section of the fuse on line 2--2
fuse. During the turning of the arming nut after
of Fig, l;
pins I9 have moved clear of slots 42, rotor arming
Fig. 3 is a cross-section of the fuse on line 3-3
pin 2S carries the detonator rotor around an equal
of Fig. l;
amount. The point of the firing pin 28 is then at
30
Fig?. 4 is a cross-section of the fuse on line «l-ll
the other end of groove 30, Fig. 3, directly over`
of Fig. 1;
'
detonator 3i, Fig. 5. The detonator and lead 32
Fig. 5 shows the fuse in the armed condition;
to booster charge 33 are then in line and ready for
Fig. 6 is a cross»section of the fuse on line 6-6
firing. Arming nut lock pin 34, Figs. 2 and '7, is
of Fig. 5;
Fig. 7 is a cross-section of a part of the fuse on 35 so located that during the rotation of the arming
nut it passes over the bottom of slot 29 without
line l-l of Fig. 2;
engaging it, but engages elongated opening 35
_ Fig. 8 is a view of the arming nut;
when the armed position has been reached, as in
- Fig. 9 shows the arming nut guide;
Fig. 5. This elongated opening must allow sutil
Fig. l0 shows the detonator holder.
The Cotter pin I-I insures the safety of the bomb 40 cient inward movement of the arming nut to eX
plode the fuse, and suñicient outward movement
during shipping and is removed when the bomb
to disarm it. Upon impact, the arming vane,
is placed in the racks on the airplane. The arm
hub, shaft and nut are driven rearward, shearing
»lng wire I2 is secured to the airplane and is pulled
the pin 36 and the thin flange ¿43 on the firing pin`
out of the fuse by the weight of the bomb as it is
released. Once the bomb is launched, the air act--l 45 driving the firing pin into the detonator which
through the lead and booster charge detonates
ing on propeller I3 turns shaft VIll until stop pin
the bomb.
I5 strikes stop pin I5. As the velocity of the bomb
In case the fuse is accidentally armed while
through the air increases, the pressure on the pro
the carrying airplane is diving at high speed, and
peller and hub overcomes the spring Il, forcing
the shaft IA and arming nut I8 inward until the 50 is not dropped, a safety feature is provided to
unarm the fuse before the airplane lands. It
guide pins I9 reach the bottom of the slots 42,
comprises a spring 31, one end of which is an
Fig. 9, in arming nut guide 20. The ball race 2l,
chored in the arming nut guide and the other in
due to securing pin 22 and collar 23, is carried in
the detonator rotor. This spring is slightly
ward with the shaft at the same time, which m0
wound about its longitudinal axis in the unarmed
tion is suñioient to cause stop pin I5 to clear stop
3
2,469,265
condition and still further so wound in the armed
condition, so that when rotor arming pin 2S is
completely Withdrawn from the 'detonator rotor
while the fuse is armed, the spring will cause it
to turn, moving the detonator out of line with
the firing pin, thus disarming the fuse almost
instantly. The Withdrawal of pin 26 is caused
.by spring Il overcoming the pressure on the pro
peller and forcing sto-p pin l5 against the top of
the fuse housing, Fig. 5. Since locking pin 34
prevents the rotation of the other parts, the Y
fuse cannot be re-armed without being disassem; "
bled.
4
air on said propeller and hub ceases to be sufñ
cient to overcome said ñrst spring.
2. A bomb fuse comprising a fuse body having
a cavity therein, a ñring pin mounted in said
cavity, an arming nut housing a portion of said
firing pin in the unarmed position, a thread
ed shaft engaged by said arming nut to translate
said nut and unhouse said ñring pin, an arming
nut guide which prevents rotation of the arming
nut until said firing pin has been completely un
housed, a detonator rotor having in it a detona
tor out of line with said firing pin in unarmed
position,.andmeans connecting said rotor to said
The fuse body sa is threaded in order that die _ ._ nut whereby rotation of said nut moves said det
fuse may be removed from the bomb. The-'arm 15 -onator into line with said firing pin.
ing nut guide is prevented from turning'in the
3. A bomb fuse comprising a firing pin, a det
fuse body by dowel pin 39. It isfurther secured
onator holder, a detonator out of line with said
in the fuse body by the housing 25 which nts
against it and is held in4 the fuse body by lock
ing screw 4B.
~
f A delay in the arming of the fuse is provided
ñring pin in the unarmed position, a propeller
`v»and shaft for moving said detonator holder to
the armed position, and means for returning said
detona'tor holder to the unarmed position when
the longitudinal force exerted by the air on said
to insure its clearing the airplane before it arms.
This is accomplished by the small pressure angle
propeller is reduced below a predetermined
on the propeller blades in combination with the
ñne pitch of the screw threads in the arming nut. 25
4. A bomb fuse comprising a threaded shaft, an
The locking nut assures an explosion on impact
arming nut engaging said shaft, and an arming
by holding the fuse in the proper armed posi
nut guide for preventing said arming nut from
tion.
turning until after a predetermined number of
`The detonatorbeing out of line in the unarmed
revolutions of said shaft, and thereafter permit
position makes the fuse safe in shipping, and 30 ting turning of said arming nut through a pre
prevents accidental firing of the bomb.
determined ang'le to the armed position, said
It will be understood that the above descrip
guide permitting suiiîcient longitudinal move
tion and accompanying drawings comprehend
ment of said arming nut in the armed position
only the general' and preferred embodiment of
to explode said fuse.
`
my invention, and that minor changes in the de 35
5. VA bomb fuse comprising a shaft having a
tails of construction and arrangement of parts
threaded portion, an arming nut engaging said
may be made within the scope of the appended
shaft, an arming nut guide preventing the turning
claims withoutrsacriñcing any of the advantages
of said nut until after a 'predetermined number
of this invention.
,
of revolutions of said shaft, and thereafter re
The invention described herein may be man 40 stricting its turning to a predetermined angle to
ufactured and used by or for the Government of
the armed position, and means for locking said
the United States of America for governmental
nut in the armed position.
y
'
purposes without the payment of any royalties
6. A bomb fuse comprising a fuse body, a
thereon or therefor.
spring located in said fuse body, a shaft penetrat-Y
- I claim:
ing said fuse body, a ball race having a nrst part
f l, A bomb fuse comprising a fuse body having
secured to said shaft and a second part held in po
a'cavity therein, a detonator holder, an arming
sition by a collar on said shaft, said spring press
nut, an “arming nut guide, a fuse body housing,
ing against said second part, a i'lrst stop pin in
a shaft Vpenetrating said fuse having screw threads
said fuse body, and a second stop pin vin said
50
on the inner-end, said screw lthreads being en
first part engaging said ñrst stop pin uutilsaid
gaged by said arming nut, said arming nut guide
shaft and ball race are forced into said fuse body
preventing rotation of said arming nut until after
against said spring pressure a predetermined
a; predetermined number of revolutions of said
distance.
'
'
.
î
shaft, a propeller and hub attached to said shaft,
'7. A _bomb fuse, comprising a rotatably mount
a ñrst spring located in said fuse body, means
ed shaft, a propeller on said shaft,~ means ini
associated with said shaft whereby said shaft and
tially preventing rotation of said shaft` through
propeller are prevented from rotating until the
a complete revolution, yieldable means acting
longitudinal force exerted by the air on said
upon said shaft, said shaft being longitudinally
propeller and hub is sufficient to overcome said'
movable against said yieldable means by air pres
first spring, a firing pin, a detonator, a lead to 60 sure above a predetermined magnitude to render
an explosive charge, the latter three elements
the first said means ineffective to prevent rota
being out of line when the fuse is unarmed and
tion- of said shaft, amember rotatable by said
being in line when the fuse is armed, a second
shaft from an‘initialposition to a second position
spring associated with said detonator holder,
to arm the fuse, and means to move said mem-n
65
means associated with said arming nut to move
loer to the unarmed position when the torque ex-`
said detonator holder'to the armed position, said
erted by said shaft'becomes less than a prede
means and second spring operating to return said
termined minimum- before impact of the bomb
amount.
detonator from the armed to the unarmed po
sition when the longitudinal force exerted by the
.
upon an object. l
RAYÑJIOND L. GRAUMANN.V
.
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