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Патент USA US3068766

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Dec. 18, 1962
3,068,756
A. J. SCHERMULY
DISCHARGERS FOR PYROTECHNIC DEVICES
Filed Dec. 2, 1959
1 4.
31
54
32
44
33
"HG-.1
)71/6/7/0/
A ?red-James Sche/mu/y
By Ms ah‘orneys
he
$58,756
Patented Dec. 18, 1982
centre of the outwardly directed surface of the plug 2
3,068,756
DISCHARGERS FUR PYROTECHNEC DEVHCES
Alfred James Schermuly, Newdigate, Barking, England,
assignor to The Sehermuly Pistol Rocket Apparatus
Limited, Newdigate, Dorking, England, a company of
and communicates with a recess in the inwardly directed
surface of the plug. This recess contains a Celluloid re
ceptacle 5 closed by a Celluloid cover 6, which receptacle
contains a gunpowder charge 7.
The casing it houses a container 8 made from light
alloy tube of circular cross-section having an external
diameter slightly less than the internal diameter of the
Claims priority, appiication Great Britain Dec. 10, 1958
casing 1. A light partition 9 is cannelured into the con
3 Claims. (Cl. 39—1.5)
10 tainer 8 intermediate its ends. One end of the container
8 is closed by a fusible alloy disc 10 having a centrally
The present invention relates to dischargers for aerial
disposed aperture therein. At its other end the container
devices such as smoke, signal and illuminating ?ares and
is closed by a removable cap 11 made of synthetic resin
other ignitible or non-ignitible devices which it may be
material.
necessary to project through the air. For the sake of
The container compartment between the fusible disc 10
simplicity in the ensuing description such devices will be 15
and the partition 9 is ?lled with a ?are composition 12,
referred to hereinafter as pyrotechnic devices.
a tubular liner 13 of phenolic resin paper being employed
Conventional dischargers for pyrotechnic devices are
to keep the composition 12 away from the internal Wall
unsuitable for use on aircraft since no provision is made
of the container 8. The container compartment between
for retaining a pyrotechnic device therein if the discharger
assumes a position, under certain ?ight conditions of the 20 the removable cap 11 and the partition 9 contains a con
Great Britain
Filed Dec. 2, 1959, §er. N . 856,714
ventional parachute ?are, generally designated by the
aircraft, in which the open end of the discharger is at a
reference numeral 14. A recess 15' is formed in that sur
lower level than the base thereof.
face of the partition 9 which faces the ?are l4 and con
The present invention provides a discharger for pyro
tains a gunpowder charge 16. The latter is retained in
technic devices which avoids the above mentioned draw
25 the recess 15 by a celluloid disc 17. An instantaneous
back.
fuze 18 leads from the ?are composition 12 through the
According to the invention there is provided a com
partition 9 to the charge 16.
bined pyrotechnic device and discharger therefor com
The parachute ?are M comprises a light alloy tube 19
prising a tubular casing closed at one end by a plug and
internally lined with a reinforced synthetic resin tube Zll.
at its other end by a removable closure device, a tubular
container slidably received in said casing, a pyrotechnic
device within said container, a ?rst explosive charge in
the casing adapted when ignited to eject the container
The tube 19 is closed at one end by alight alloy disc 21,
and closed at its other end by an aperturcd fusible disc
22, the volume de?ned by the tube 2% and the discs 21
and 22 being ?lled with a ?are composition 23. A tube
from the casing, a second explosive charge in said con
2.4 of phenolic resin paper is arranged between the disc
tainer adapted when ignited to eject the pyrotechnic de
vice from the container, ignitible means in the container 35 21 and the removable cap 11, the volume de?ned by the
tube 215, the cap 11 and the disc 21 containing a con
initiated by said ?rst explosive charge and adapted to ini
ventional parachute 25. The connection between the
tiate said second explosive charge a predetermined time
parachute and the ?are is accomplished by means of
after initiation of the ?rst explosive charge, an igniter in
said plug for igniting said ?rst explosive charge. This 40 lengths as of wire passing through the eye of a split pin
27 which is mounted in a hole in the disc 21. To ensure
pyrotechnic device and discharger works in combination
the combustion of ?are composition 12 following ignition
with a projection on the casing adjacent the plugged end
of the charge 7, and the combustion of ?are composition
thereof; the support member comprising cup means
23 following the ignition of the charge 16, layers 28 and
adapted to receive one end of said casing, electrical con
tact means within said cup means adapted to engage the 45 29 of ?ash sensitive ignition compositions are placed
adjacent the fusible discs it‘: and 22, respectively.
ignitable means of a casing received within the cup
To ensure that the container 8 will not move relative
means and initiate the explosive train that ?nally ejects
to the casing 1 during transport and handling, plastic
and ignites the pyrotechnic device and removable retain
packing discs 30 are employed to urge the container
ing means attachable to the cup means for engagement
against the plug 2.
with said projection on a casing received within the cup
When an electric current is supplied to the electrical
_means to removably secure the casing within said support
igniter 4 the gunpowder charge 7 is initiated and the con
member.
tainer 8 is ejected from the casing, the thin tin-plate sheet
One form of combined pyrotechnic device and dis
3 at the end of the casing 1 being blown off in the process.
charger therefor in accordance with the invention will
now be described, by way of example, with reference to 55 At the same time the ?ash from the explosion of the charge
7 ignites the ?are composition 12 in the container 8.
the accompanying drawing, in which
After a predetermined time the ?are composition ignites
FIGURE 1 is a sectional view of the combined pyro
the instantaneous fuze 18 and the latter initiates the gun
technic device and discharger,
powder
charge 16 to eject the parachute ?are 14 from
FIGURE 2 is a sectional view of a part of the com
bined pyrotechnic device and discharger of FIGURE I 60 the container. At the same time the ?ash from the charge
16 ignites the ?are composition 23 of the parachute ?are.
mounted in a support, and
A short distance ‘from the plugged end of the casing
FIGURE 3 is a side elevation, on a reduced scale,
the
wall of the casing comprises a circumferentially dis
showing two supports of the kind illustrated in FIGURE
posed portion 31 of greater diameter than the remainder
2 mounted on a common baseplate.
of the casing.
Referring to FEGURE 1, the combined pyrotechnic 65
In use of the above described device and referring to
device and discharger illustrated comprises a casing 1 of
FIGURE 2, the plugged end of the casing l is introduced
circular cross-section formed from a mild steel tube and
closed at one end by a light alloy plug 2 which is can
into a support comprising a short tube 32 of circular cross
section having an internal diameter slightly greater than
the external diameter of the casing. The external surface
70
is closed by a thin sheet 3 of tin-plate soldered or other
of tube 32 is provided with a screw thread, having a diam
nelured into the casing. At its other end the casing 1
wise lightly secured to the casing.
A conventional electrical igniter 4 is mounted in the
eter slightly greater than the diameter of the portion 31 of
the casing. Tube 32 is mounted on a base plate 33 and
3,068,756
3
has a length slightly greater than the length of easing 1
between its plugged end ‘and the portion 31. The casing
is retained in tube 32 by a collar 34 having portions of
two di?erent diameters. The portion of larger diameter
is internally and is adapted to be screwed on to the external thread of tube 32,, and the other portion of the
collar has a diameter slightly greater than the diameter of
the casing 1 but less than the diameter of the circumfer
entially disposed portion 31. The collar 34 is slid over
the casing 1 and screwed on to the end of the tube 32 to
,
r
a.
" projection slightly thus ensuring an effective electrical
return path for the igniter through the casing; whereby
I there is a vibration secure attachment of the collar to the
1cup and yet the casing is easily removed or replaced.
2. A pyrotechnic device comprising a rigid cylindrical
metal tubular casing having a longitudinal axis, a ?rst
end and a second end, plug means closing the ?rst end,
removable closure means closing said second end, a
pyrotechnic object slidably received within said casing,
an explosive charge located within said plug means for
clamp the portion 31 of greater diameter of the casing
against the end of the tube 32. The baseplate 33 is pro
ejecting said pyrotechnic object from the casing through
vided with an electrical contact device for conveying an
» located within said plug means, means for conveying
said second end, an electrical igniter for said charge
ignition from said explosive charge to said pyrotechnic
electric current to the electrical igniter in the plugged end
of the casing 1.
15 object, and a radially symmetrical circumferential out
Wardly directed projection formed on the casing adjacent
The electrical contact device on the baseplate 33 com
prises a tubular support member 35 having one end
to, but in spaced relation from said ?rst end, the limits
?anged and secured to the baseplate 33. The other end
of said projection in the direction of said longitudinal
axis each lying in a plane at right angles to said longi
of the member 35 is closed by an insulated plug 36 can
nelured thereinto. A cadmium'plated contact pin 37 hav 20, tudinal axis, in combination with a supporting means
ing a ?anged portion 38 is urged against the igniter in
therefor comprising cup means surrounding said ?rst
the plugged end of casing I mounted in the support by a
end of the casing, and a cooperating annular collar for
spring 39. The contact pin 37 passes through an insulated
retaining the casing therein, said cup means including a
bushing 44) pressed into the baseplate 33 thereby main
base and a right-circular cylindrical vwall upstanding
taining electrical insulation between the contact pin 37 25 from said base having a screw-thread located on the ex
and the baseplate.
ternal surface thereof and an internal bore dimensioned
to slidably receive and positively locate said ?rst end of
[FIGURE 3 shows how the support of FIGURE 2
the casing, the length of said wall being slightly greater
could be mounted in practice. A plurality of discharges
than the distance in the direction of said longitudinal
(two being shown in FIGURE 3) can conveniently be
mounted on the same baseplate 33, the conductors for 3G) axis between said ?rst end of the casing and the adjacent
limit of said projection, a spring~urged electrical contact
the electrical ?ring being connected to a plug and socket
connector 41 mounted on a frame 42. To facilitate lock
pin mounted on said base in a position to contact the
electrical igniter of a casing received in said cup means,
means electrically insulating the cont-act pin from the
35 base, the annular collar comprising a top and a depend
to collars 34, on tubes 32.
ing circumferential skirt, said skirt having a bore greater
Following the ‘discharge of the container 8 from a cas
than the maximum diameter of said projection and being
ing 1 mounted in the support, reloading simply involves
internally screw-threaded to cooperate with the thread
unscrewing the collar 34, replacing the empty casing with
on said cup means, said top having a central hole therein
an un-discharged device, and re-tightening the collar
40 only slightly larger in diameter than the diameter of
around the new casing.
said casing, the length of said skirt being greater than
What I claim is:
t
the overall dimension of said projection in the direction
‘l. A combined pyrotechnic device, discharger support
of said longitudinal axis but less than the sum of the
member therefor and aircraft to which the support mem
overall dimension of said projection and the length of
ber is attached, in which the combined pyrotechnic de
vice and dischargcr comprises the pyrotechnic device, a 45 said wall.
3. In a pyrotechnic device comprising a rigid cyl
tubular container enclosing the pyrotechnic device, a
tubular casing adapted to slidably receive the container
indrical metal tubular casing having a longitudinal axis,
when the latter is muzzle loaded into the support member,
a ?rst end and a second end, plug means closing said
a plug closing one end of the casing and a closure for the
?rst end, removable closure means closing said second
other end thereof adapted to ‘be blown off when the con
end, a pyrotechnic object slidably received within said
tainer is ejected from the casing, a ?rst explosive charge
casing, ‘an explosive charge located within said plug
in the casing adapted when ignited to eject said container
means for ejecting said pyrotechnic object from the cas
from said casing, ignita-ble means in the container adapted
ing through said second end, an electrical igniter for said
to be ignited by said ?rst explosive charge, a sec
charge located within said plug means, means for con
ond explosive charge in the container adapted to be in 55 veying ignition from said explosive charge to said pyro
itiated by said ignitable means a predetermined time after
technic object, ‘and ‘a radially symmetrical circumferen
tial outwardly directed projection formed on the casing
initiation of the ?rst explosive charge, and an electrical
igniter in said plug for igniting the ?rst explosive charge
adjacent to, but in spaced relation from said ?rst end,
in response to a potential applied between said igniter and
the limits of said projection in the direction of said
said casing, in combination with a circumferential pro 60 longitudinal axis each lying in a plane at right angles to
jection around and rolled from the casing, which projec
said longitudinal axis, in combination with a supporting
tion is at right angles to the longitudinal axis of the casing
means for said pyrotechnic device mounted on an air
spaced at a distance from the plugged end of the casing
craft, the supporting means comprising cup means sur
and resilient in the longitudinal direction of ‘the casing,
rounding the said ?rst end of the casing, and a cooperat
the support member comprising cup means adapted to
ing annular collar for retaining the casing therein against
receive slidably therein the short length of easing between
the severe vibrations encountered in aircraft operations,
the plugged end and the projection, electrical contact
said cup means including a base and a right-circular
cylindrical wall upstanding from said base having a
means within said cup means adapted to engage said ig
niter of said casing and initiate the explosive train that
screw-thread located on the external surface thereof and
?nally ejects and ignites the pyrotechnic device, and a 70 an internal bore dimensioned to slidably receive and
ing of the collars 34 a pair of diametrically disposed pro
jections 43 are provided on lock rings 44 threaded contra
removable annular collar retaining means screw thread
edly attachable to the cup means after insertion there-in of
positively locate said ?rst end of the casing, the length
of said wall being slightly greater than the distance in
the direction of said longitudinal ‘axis between said ?rst
the casing for attachment with said projection of the cas
ing, the ?nal turning of the collar to tighten the casing in
end of the casing and the adjacent ‘limit of said projec
the support causing the edge of the collar to cut into the 76 tion, which said limit rests on the top edge of the up
8,068,756
5
6
standing wall of the cup means, a spring-urged electrical
opposed protuberances on its perimeter to facilitate the
contact pin mounted on said base in a position to contact
the electrical igniter of a casing received in said cup
means, means electrically insulating the contact pin from
the base, the annular collar comprising a top and 21
screwing up of said locking ring tightly against the
depending circumferential skirt, said skirt having a bore
greater than the maxmum diameter of said projection
and being internally screw-threaded to cooperate with
the thread on said cup means, said top having a central
hole therein only slightly larger in diameter than the
diameter of said casing, the length of said skirt being
greater thm the overall dimension of said projection in
the direction of said longitudinal axis but less than the
sum of the overall dimension of said projection and the
length of said wall, the top of said collar abutting the 15
upper limit of the projection thus to ensure that the
annular collar to ensure therewith and also in coopera
tion with the aforesaid projection a mounting of the
pyrotechnic ‘device which is secure against all aircraft
vibrations.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,823,390
Driggs et al ___________ __ Sept. 15, 1931
2,381,474
2,436,751
2,459,687
2,669,181
Turnlbull ____________ __ Aug.
Hammell et al _________ __ Feb.
Decker ______________ __ Jan.
Cooper et a1. ________ __ Feb.
72,124
1,010,316
Denmark ____________ __ Feb. 5, 1951
France ______________ __ Mar. 19, 1952
means threaded central to that of the annular collar
disposed just beneath the same and having diametrically
1945
1948
1949
1954
FOREIGN PATENTS
projection is gripped tightly along its two parallel limits,
and a locking ring on the upstanding wall of the cup
7,
24,
18,
16,
Alfred James Schermuly
December 18, 196
It is hereby certified that err
, after "1°n1:emnally"I insert —=
central” read ~~
C
a “
, under the heading "UNITED STATES PATENTS"
5.632 (:1
ale ~~~~~ ——=Mar, 19, 1957 “a
v
(SEAL)
Attest:
ERNEST W . SWIDER
Attesting Officer
DAVID L. LADD
Commissioner of Patents
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No° 3,068,756
December 18' 1962
Alfred James Schermuly
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
Column 3, line 5, after "internally" insert —— ‘threaded
-—; column 5, line 19, for "central" read --— contra ——;
column 6, under the heading "UNITED STATES PATENTS'“ insert
—- 2,785,632 Clauser et alq
————— ——-Mar.,
19,
1957
——.,
Signed and sealed this 3rd day of September 1963‘.
(SEAL)
Attest:
ERNEST w. SWIDER
DAVID L- LADD
Attesting Officer
Commissioner of Patents
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