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Патент USA US2411788

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Nov. 26, 1946.
J. H. HAMMOND, JR
2,411,738
BOMB CONTROL SYSTEM
Filed Dec. 18, 1943
25
2 Sheets-Sheet 1
RADIO CONTROL APPARATUS
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EXPLOSQVE
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INVENTOR
JOHN HAYs HAMMOND,JR.
Nov. 26, 1946.
J. H. HAMMOND, ‘JR '
\ 2,411,788
BOMB CONTROL SYSTEM
Filed Dec. 18, 1943
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INVENTOR
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2,411,788
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John Hays Hammond, J12, Gloucester, Mass,
assignor to Radio Corporation of America
Application December 18, 1943, Serial No. 51%,747
8 Claims. (Cl. 102'—2)
1
2
This invention relates to the detonation of
bombs by radiant energy and more particularly
to the radio detonation or a plurality of bombs
provided for guiding the bomb in its ?ight. The
interior of the bomb is divided into three com
partments l5, I6 and H by means of two trans*
simultaneously.
verse bulkheads l8 and W.
The invention also provides means for making
the detonating mechanism of the bomb inactive
for a predetermined time after the bomb has
In the compartment [Sis the explosive charge
during certain predetermined hours of the day
for several consecutive days.
sorbing material.
In the casing 23 is mounted a radio control
The invention also provides means for ex
apparatus 25, a time mechanism 26 and a con
2| and a detonator 22. Between the bulkheads
I8 and I9 is mounted a cylinder 22' in which
slides a cylindrical casing 23. The space between
been released.
the base of the casing 23 and the bulkhead I8 is
The invention further provides means for mak
ing the radio receiver in the bomb active only 10 ?lled with sponge rubber 24 or other shock ab
tact device 21. The radio control apparatus 25
plodingthe bomb automatically at the end of a
predetermined time which is preferably several 15 is connected by a ?exible conductor 28 to an
days.
antenna 29 mounted inside the casing H3. The
antenna may be of any suitable non-directive
The invention further provides means for au
construction and may, if desired, be embedded
tomatically exploding the bomb if it is disturbed
in the plastic material.
'
in the slightest from the position in which it
20' The radio control apparatus 25, see Fig. 3,
came to rest after hitting the target.
1
may comprise a radio receiver 3|, to which the
The invention also consists in certain new and
antenna 29 is connected, a power pack 32, a
original features of construction and combina
selector 33 and a relay tube and relay 34. ‘The
tions of parts hereinafter set forth and claimed.
contacts of the relay 34 are connected to two ter
Although the novel features which are be
minals 35 and 36. The power pack 32 may in-_
lieved to be characteristic of this invention will
clude a battery 31 and is connected to two ter
be particularly pointed out in the claims ap
minals 38 and 39.
pended hereto, the invention itself, as to its ob
A suitable transmitter may be provided on the
jects and advantages, the mode of its operation
airplane, see Fig. 2, which includes a subaudible
and the manner of its organization may be bet
ter understood by referring to the following de 30 oscillator 4|, a key 42,13. modulator 43, an oscil
lator ampli?er 44 and an antenna system 45.
scription taken in connection with the accom
The time mechanism 26 includes three discs
panying drawings forming a part thereof, in
46, 41 and 48 (Fig. 1), which rotate at varying
which
speeds. For example, the disc 46 may make one
Figure 1 is a section thru the bomb showing
1) LI revolution in four hours, the disc 41 one revo
the control mechanisms;
lution in twenty-four hours and the disc 48 one
Figure 2 illustrates diagrammatically the
revolution in four days. The disc 46 is provided
transmitting circuits on the plane;
with a pin 49 and the discs 41 and 48 are pro
Figure 3 illustrates diagrammatically the re
vided with conducting sectors 5! and 52 respec
ceiving circuits located in the bomb‘;
tively.
‘
Figure 4 is an enlarged plan view of the sensi
Engaging the pin 49 is an arm of conducting
tive mechanism for detonating the bomb if dis
material 53 which is pivoted at 54. A spring 55
turbed; and
tends to move this arm to the left. Co-operating
Figure 5 is an enlarged sectional view of part
of the mechanism shown in Fig. 4.
with the arm 53 are two contacts 56 and 51.
Like reference characters denote like parts in 45 Engaging the discs 41 and 48 are two pairs of
contacts 58—59 and 6l—62 respectively.
the several ?gures of the drawings.
In the following description parts will be
, The contact mechanism 21 comprises a hemi
spherical bowl 63 (Figs. 1, 4 and 5) provided
identi?ed by speci?c names for convenience, but
with a top 64, the bowl and top being made of
they are intended to be as generic in their ap
plication to similar parts as the art will permit. 50 nonconducting material. The bowl is secured to
Referring to the accompanying drawings and
a ring 65 which is pivotally mounted in a gimbal
ring 66, which in turn is pivotally mounted in
more particularly to Fig. 1 a bomb ‘H is provided
with a steel casing l2 to which is attached a
brackets 61.
'
Secured to the ring 65 is a‘ pivot 66, rotatably
hemispherical casing l3 made of plastic or other
non-metallic material. Suitable vanes '4 are 55 mounted in the gimbal ring 66, to the end of
2,411,788
.
3
which is secured a friction disc 88, see Fig. 5.
Mounted on a bracket ‘II, which is secured to
the gimbal ring 88, is a solenoid ‘I2 provided with
a core ‘I3. Secured to the core ‘I3 is a collar ‘I4
between which and the solenoid ‘I2 is mounted
a compression spring 15. Mounted on the
gimbal ring 88 is a spring ‘I8, which is held out
of engagement with the friction disc 88 by means
of the core ‘I3.
A weight ‘I8 mounted on the
gimbal ring 88 counterbalances the weight of the
solenoid ‘I2, etc.
Secured to the gimbal ring 88 is a pivot 11
where a similar construction is provided includ
4
41 will rotate in a clockwise direction, as indi
cated by the arrow, until the segment 5| en
gages the contacts 58 and 58 which will close
the circuit of the battery 31 of the'power pack
32. This will put the whole radio control appa
ratus 25 into a sensitive condition ready to re
ceive signals from the transmitter shown in Fig.
2. This energization may be initiated, for ex
ample 20 hours after the bomb has been dropped
and may last, for example, for a period of four
hours. This active period'will recur each 'day
for a predetermined interval of time for a period
of several days.
If during this active period a predetermined
ing a spring ‘I8 which is controlled by a sole
noid ‘I8. The winding of the solenoid ‘I2 is con 15 signal is transmitted from the airplane and is
nected by a ?exible conductor 8| to one side of
received by the antenna 28 of radio control ap
a battery 83 and by a ?exible conductor 82 to the
paratus 25 will cause the relay circuit 34 to be
contact 51. The other side of the battery 83 is
closed thus completing a circuit from the battery
connected by a conductor 88 to the arm 53. The
88, conductors 81 and 8| to terminal 35. relay
winding of the solenoid ‘I8 is connected by branch 20 34, terminal 38, conductors 82 and 88 to the det
conductors 84 and 85 to the conductors 8| and
onator 22, which will be exploded, thus detonat
82 respectively.
ing the explosive charge 2|.
Mounted in the top 84 of the bowl 83 are four
contacts 88 which are connected together and
by a ?exible conductor 81 to the arm 53. The
bowl 83 is ?lled with mercury 88 or other con~
In this way, all of the bombs, which may have
been planted during several bombing raids over
a period of several days, may be exploded simul
ducting liquid, to a level just below the contacts
88. Projecting into the mercury 88 is an elec
The type of radio transmitter depicted in Fig.
taneously.
I
i 2 is assumed to produce a high frequency car
trode 89 which is connected by a ?exible con
rier wave, which is modulated at a lower fre
ductor 8| to the terminal 35. The terminal 38 30 quency, which for example may be a subaudible
is connected by a conductor 82 to the contact 58
frequency. The receiver shown in Fig. 3 is of a
and the terminals 38 and 38 are connected by
type suitable to selectively receive this signal and
conductors 83 and 84 to the contacts 58 and 58
cause the operation of the relay 34. It is to be
respectively. The contacts 8| and 82 are con
understood, however, that the radio system is not
nected by branch conductors 85 and 88 to the 35 to be limited to this particular type, but may be
conductors 8| and 82, respectively, which in turn
are connected by ?exible conductors 87 and 88
and a battery 88 to the detonator 22.
4
In the operation of this invention when the
bomb H is released from the airplane the time
mechanism 28 is started by any suitable means
not shown. When the bomb strikes the target
it will not explode, as the circuit to the detonator
22 is open at the contact 58. The sponge rub
of any suitable'design and construction.
It the bomb is not exploded by radio after a
predetermined,» period, which, for example may
be four days, the‘ disc 48 will have rotated in a
clockwise direction, as indicated by the arrow, so
that the segment 52 will engage the contacts 8|
and 82, This will close a circuit from the battery
88, conductors 8‘! and 85, contact 8|, segment 52,
contact 82, conductors 88 and 88 to the detonator
ber 24 will absorb the shock of striking the target 45 22 which will be exploded, thus detonatlng the
explosive charge 2|.
‘ so that the mechanisms in the casing 23 will not
be damaged. After the bomb has come to rest
It is thus seen that a system is provided in
the contact device 21 will assume a horizontal
which salvos of bombs may be planted on targets
position, as it is suspended in the gimbal ring 88.
on successive days and then all exploded simul
After a predetermined interval of time has 50 taneously by a remote radio signal thus produc
elapsed, for example four hours, the disc 48 to
ing a much greater destructive eifectv than if
gether with the pin 48 will have rotated su?i
each of the bombs exploded at the time it struck
ciently in a clockwise direction, as indicated by
the target. If, for any reason, it is not possible
the arrow, to release the arm 53, which will be
to explode the bombs by radio they will be auto
moved to the left under the action of the spring 55 matically exploded at the end of the predeter
55, thus engaging the contacts 58 and 51. This
mined period. Meanwhile any attempt to tamper
will close a circuit from the battery 83 thru the
with or remove the bomb will cause it to explode.
solenoids ‘I2 and ‘I8, the cores of which will be
Although only a speci?c formin which this in
retracted, thus releasing the springs ‘I8 and ‘I8
vention may be embodied has been shown herein,
which will clamp the contact device 21 in what 60 it is to be understood that the invention is not
ever horizontal position it has assumedwith
limited to any speci?c construction but may be
respect to the bomb H. In this position the
embodied in various forms without departing
contacts 88 will be just clear of the surface of
from the spirit of the invention as de?ned by the v
the mercury 88.,
appended claims.
If any attempt is made to tamper with the
What is'claimed is:
bomb and it is moved ever so slightly from the
1. A bomb comprising a detonator, an electric
position in' which ‘it came to rest the mercury
actuating circuit therefor including a liquid
88 will engageone of the contacts 88 thus com
switch means adapted to be closed in response to
pleting a circuit from the battery 88 conductors
tilting from a horizontal position, means mount
81 and 8|, electrode 88, mercury 88, contact 88, 70 ing said liquid switch means for universal move
conductor 81, arm 53, contact 58 and conductors
ment, gravity actuated means to cause said liq
82 and 88 to the detonator 22 which is exploded
uid switch means to assume a horizontal posi
thus causing the detonation of the explosive
charge 2|.
tion, means initially holding said actuating cir
cuit open, and time-controlled means actuated
If the bomb is not thus exploded the disc 76 after said bomb comes to rest to lock said mount
2,411,788
5
6
circuit for ?ring the detonator, a ?rst time-con
ing means against further movement relative to
said bomb and to close said actuating circuit; to
said liquid switch means, whereby movement of
said bomb thereafter will close said liquid switch
trolled means for conditioning the detonator cir
cuit to be energized upon the movement of the
bomb from its position of rest after its release, a
second time-controlled means for conditioning
the detonator circuit to be energized during pre
means and operate said detonator.
2. A bomb comprising a detonator, an electric
determined time intervals upon receipt of a con
actuating circuit therefor including a mercury
switch adapted to be closed in response to tilting
from a horizontal position, gimbal means mount
trol signal from a remote point, and a third time
controlled means for conditioning the detonator
circuit to be energized at the termination of a
predetermined number of such time intervals.
ing said switch for universal movement, gravity
actuated means to cause said switch to assume a
6. A bomb comprising a detonator, an electric
circuit for ?ring the detonator, a plurality of
switches selectively operable each to energize said
circuit, means for conditioning the detonator cir
cuit to be closed through one of said switches
upon movement of the bomb from its position of
rest, time-controlled means for closing the det
onator circuit through a second of said switches
3. A bomb comprisingr a detonator, an electric 20 upon the receipt of a radio control signal, and
other time-controlled means for closing the det
actuating circuit therefor including a liquid
onator circuit through a third of said switches
switch adapted to be closed in- response to tilting
after the lapse of a predetermined time interval
from a horizontal position, means mounting said
in the absence of a control signal.
switch for universal movement, gravity actuated
7. A bomb comprising a detonator, an electric
means to cause said switch to assume a horizon 25
circuit for ?ring the detonator, a plurality of
tal position, a normally open contact in circuit
horizontal position, a time switch initially hold
ing said actuating circuit open, and time-con
trolled means operative after said bomb comes to
rest to close said time switch and to lock said
gimbal means against further movement relative
to said bomb, whereby movement of said bomb
thereafter will close said mercury switch and up
erate said detonator,
switches selectively operable at predetermined
with said liquid switch, time-controlled means
times each to energize said circuit, means for
closing said last contact and locking said liquid
actuating one of said switches to thereby condi
switch against further movement relative to said
bomb whereby movement of said bomb thereafter 30 tion the detonator circuit to be energized upon
movement of the bomb from its position of rest,
will close said liquid switch and operate said det
onator, a radio receiver including a relay con
nected to close said actuating circuit, said re
ceiver having means responsive to a predeter
mined received radio signal to energize said re
lay, time-controlled means for rendering said re
ceiver operative to receive radio waves periodi
cally for predetermined intervals of time where
by said bomb will be exploded upon reception of
the detonator circuit upon the receipt of a radio
control signal, means for actuating another or‘
said switches to close the detonator circuit after
35 the lapse, of a predetermined time interval in
the absence of a control signal, and time mech
anism controlling the operation of said switch
actuating means in a predetermined time se
said predetermined signal during said operative 40
periods, and additional time-controlled means
connected to close said actuating circuit to op
erate said detonator after a predetermined num
ber of such operative periods.
4. A bomb comprising a detonator, an electric
circuit for ?ring the detonator, a ?rst time-con
trolled means for conditioning the detonator cir-'
cuit to be energized upon the movement of the
bomb from its position of rest, a second time
controlled means for conditioning the detonator
circuit to be energized upon receipt of a control
signal from a remote point, and a third time
controlled means for conditioning the detonator
circuit to be energized after the lapse of a pre
quence.
8. A bomb comprising a detonator, an electric
circuit for ?ring the detonator. a plurality of
switches selectively operable at predetermined
times each to energize said circuit, means ior
actuating one of said switches to thereby condi
tion the detonator circuit to be energized upon
movement of the bomb from its position of rest,
a radio receiver having a relay which operates
upon receipt of a predetermined radio signal to
actuate another of said switches to close the det
onator circuit, means for actuating another of
said switches to close the detonator circuit after
the lapse of a predetermined time interval in the
absence of a control signal, and time mechanism
controlling the operation of said switch actuating
55 means in a predetermined time sequence.
determined time interval.
JOHN HAYS HAMMOND. JR.
5. A bomb comprising a. detonator, an electric
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