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Патент USA US3087379

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Apnl30, 1963
Filed April 4, 1960
United States i‘ atet
Patented Apr. 30, 1963
from the extremity of the ?ring pin by a shear pin, wire
or other appropriate retaining means.
The main body of the ?ring pin is normally right cylin
drical and is provided with a basal projection to contact
Neii J. Entter?eld, Hartford, llL, assignor to 01in Mathie
the impact responsive initiating means, while the oppo
son Chemical Corporation, East Alton, Ili., a corpora
tion of Virginia
site end of the ?ring pin is tapered or curved to provide a
generally conical con?guration terminating in a central
rod-like extension. The main body of the ?ring pin is
contained in a counterbore of the plug opposite the pneu
Filed Apr. 4, 1960, Ser. No. 19,666
1 Claim. ((11. 85—1)
This invention relates to explosively actuated release
matic trigger or striker rod and the rod-like extension on
means and more particularly to explosive bolts or links
the ?ring pin extends through a bore of the plug connect
ing the counterbores at its extremities. The tapered or
conical portion of the ?ring pin is of the same general con
for detachably connecting one article to another.
Various types of explosively actuated release mech
anisms or explosive bolts have been devised for jettison
?guration as the surrounding counterbore. Thus, upon
ing bombs, canopies and other stores from vehicles in 15 initiation of the explosive charge, the ?ring pin is forced
?ight. Such explosive bolts normally take the form of
back upon a mating surface to provide a gas-tight seal
a hollowed cylinder containing an explosive charge. The
whose e?ectivenes increases with the pressure generated.
majority of such devices rely upon the electrical ignition
The metal-to~metal seal can be restricted to the area about
or initiation of the explosive charge which then detonates
the apex of the conical portion of the ?ring pin, or the
or forms disruptive gas pressure to sever the connection.
entire conical area of the pin can serve as a sealing sur
This eype of electrically actuated explosive bolt has, in
most instances, been found to be very reliable and service
Although the present invention is primarily concerned
able. However, they are completely inoperative and of
with explosive bolts and the like which can be operated
by ?uid pressure, such devices which can be initiated
either by electrical or ?uid energy are also contemplated.
no use whatsoever in the event of a power failure. This
shortcoming of electrically initiated explosive bolts is
well recognized and attempts have been previously made
to provide such devices that are operable by pneumatic
pressure. These pneumatically operated release mech
anisms are generally of the type in which retaining bolts
or pins are propelled out of position by an explosive
charge. In such devices, the pressure required to move
the retaining pin is roughly proportional to the amount
of weight it is supporting. Thus, when stores of appre
Most conveniently, the electrical and impact initiating
means are repositioned remote from one another.
plicity of design normally dictates that the actuators be
located at opposite ends of the explosive charge. How
ever, in some instances, both of the initiating means can
be positioned in close proximity.
The present invention and the manner in which it ac
complishes its objects will be more readily understood by
ciable weight are to be jettisoned, the amount of pro
reference to the following speci?c example thereof taken
pellent and the gas pressure required to dislodge them 35 in connection with the drawing illustrating a longitudinal
is inordinately great and exceedingly hazardous.
cross-sectional view of a preferred embodiment.
It is, therefore, an object of the present invention
The hollow body of the bolt indicated generally at 1
to provide a new and novel explosive bolt or link over
is provided with hexagonal portions as indicated at 2 and
coming the disadvantages of the prior art. A further
3' to facilitate manipulation of the bolt. Connecting means
object of the present invention is to provide an improved 40 such as screw threads 3a may be provided at each end of
explosive bolt that can be actuated by non-electrical
means. A more speci?c object of the present invention
is to provide an explosive bolt that can be easily and
the bolt to facilitate connecting the bolt between elements
which are to be separated one from the other when the
bolt is ?red. A peripheral groove 4 and internal notch 5
reliably operated by ?uid pressure.
circle the central portion of the bolt about a propellant
In accordance with ‘this invention, these and other 45 powder charge 6. Plug 7‘ is threadedly attached within
objects are accomplished, generally speaking, by provid
the hollow body 1 and is provided with a pair of oppo
ing an explosive bolt body containing an explosive charge,
sitely disposed counterbores. The counterbore closest
a percussion or stab initiated primer, a ?ring pin and a
pneumatic trigger. More speci?cally, this invention con
templates an explosive bolt having a hollow body con
taining an explosive charge intermediate its ends and
having that portion of the body adjacent the explosive
charge weaker than the remaining portions of the body.
to the propellent charge accommodates primer 8, primer
retainer 9 and ?ring pin 10. The ?ring pin is provided
with a centrally positioned basal protrusion 11 which is
normally in contact or alignment with the primer. The
rearward portion 12 of the ?ring pin is conically shaped
and forms a mating ?t with the tapered walls of the
At least a portion of the body about the explosive charge
counterbore. Rod-like extension 13 on the ?ring pin
can be rendered relatively weak by the provision of 55 passes through the bore connecting the two counterbores
notches, grooves, appropriate thinning and the like, by
heat treatment, or by other equivalent means.
The ex
and extends into counterbore 14 which accommodates
pneumatic trigger or striker rod 15. The striker rod is
plosive charge, which may be either of the propellent
maintained in position by retaining pin 16 which passes
or brisant type, has an impact responsive initiating means
through it and the adjacent wall of plug 7. Retaining pin
in association therewith. When a propellent charge is 60 16 can be replaced by a wire or other similar means.
used, the impact responsive initiator is generally a per—
Gas check 17 closes counterbore 14 and prevents passage
cussion primer of the type normally used in ammunition.
of gas between the pneumatic trigger and the plug. As
However, when a brisant explosive, such as cyclonite or
shown in the drawing, the gas check is in the form of a
the like is employed, the impact responsive initiating
cup wad. However, a resilient O-ring positioned between
means can be a stab initiated detonator. One end of the 65 the striker rod 15 and plug 7, or other conventional means
hollow bolt body is ?tted With a bored plug which accom
can be used as a gas check.
modates the ?ring pin and the pneumatic trigger. The
The explosive bolt of this preferred embodiment is also
?ring pin is preferably positioned in contact with the
impact responsive initiating means but can be spaced
provided with electrical initiating means carried by plug
18 which is screw threadedly a?ixed in body 1. A pair
therefrom in any conventional manner if so desired. The 70 of electrodes 19 are positioned in nylon or other insulat
pneumatic trigger preferably takes the form of a striker
rod contained in a counterbore of the plug and positioned
ing tubing 26 and pass through bores in plug 18. The
interior ends of electrodes 19' are provided with nylon
washers 21 and are connected by one or more bridge wires
22. The bridge Wires are embedded in ignition mix ‘23
which is in contact with base charge 6.
The device described in the preferred embodiment was
made of steel, but any other structural material such as
When the device is to be operated pneumatically, a
non-ferrous materials, their alloys, and the like can also
be utilized. In addition, any suitable thermo-responsive
gas generating charge or brisant explosive charge can be
used in lieu of the propellent powder charge.
Although the foregoing embodiment has been described
tubing connected to a source of high pressure gas is at
tached to that end of the body approximate gas check, 17
with the end of the retaining pin 16 unobstructed. Pref
erably, the source of high pressure gas is a conventional
ferrous alloys, aluminum, titanium, magnesium, and other
in detail, many variations or modi?cations can be made
gas generating cartridge. However, any other source of
compressed gas can be utilized with equal success. The 10 therein by those skilled in the art without departing from
the spirit and scope of the invention.
striker rod 15' remains stationary until the gas pressure
What is claimed is:
behind it reaches a level of about 500 p.s.i. At that
An explosive bolt comprising an elongate frangible
point, retaining pin 16 is broken and striker rod 15 is
body having connecting means at either end, an axial
driven with considerable vforce into contact with rod-like.
extension 13 of the ?ring pin. This results in basal pro 15 bore extending through the body, an explosive charge
positioned within the bore intermediate the ends of the
tuberance 11 of the ?ring pin impinging upon the primer
body, said body being grooved to provide a relatively
8 with equal force. Primer 8 is thus initiated and the
weak area in the body external to the explosive charge,
flame from the primer passing through ?ash hole 24 re
a percussion primer within the bore adjacent to one side
sults in the ignition of powder charge 6. As the powder
charge burns, the pressure within the bolt increases pro 20 of the explosive charge. and an electrically actuated igniter
adjacent the opposite side of the explosive charge, a plug
gressively and results in the rupture of the bolt around
rigidly a?ixed within the bore and extending substantially
peripheral groove 4 and internal notch 5.
from the explosive charge to one end of the body, the
The pressure generated by the burning propellent
plug having ?rst and second counterbores at either end
charge 6 is much greater than that employed to drive the
striker rod into contact with the ?ring pin. Thus, the 25 and an intermediate connecting bore, the base of the
?ring pin is forced away from the propellent charge and
into sealing relationship with the counterbore of plug 7.
The seal between the ?ring pin and the corresponding
counterbore is exceedingly effective and is capable of re
sisting pressures of the ‘order of 150,000 p.s.i. After the 30
explosive bolt has ?red, the pressure on the base of the
?ring pin is released and the residual pressure in the
bolt assembly is liberated upon ejection of the ?ring pm.
When the retaining pin 16 is severed, the entire body of
?rst counterbore facing tthe explosive charge being
tapered, a ?ring pin in said ?rst counterbore having a
basal protuberance normally in contact with said primer,
the portion of the ?ring pin remote from the protuberance
being tapered to form a mating ?t with at least a portion
of the counterbore, a rod like extension extending from
said tapered portion through said intermediate connect
ing bore and terminating Within the second counterbore,
a pressure responsive striker rod retained within said sec
striker rod 15 and gas ‘check 17 travel through counterbore 35 ond counterbore and positioned from the end of the
rod-like extension of the ?ring pin, rupturable pin means
14 to a position beyond the hole in the plug and retain
extending transversely through said plug and into said
ing pin 16. Thus, any residual pressure in the gas line
striker rod to retain said striker rod in said spaced con
is vented through this hole.
dition, said striker rod being actuated by gas pressure
The present explosive bolt can also be operated elec
emanating from a source of gas pressure, said pressure
trically in the conventional manner. When an electrical
being of su?‘icient force to rupture said pin means and
discharge is desired, electrodes 19 are connected to a
drive said'striker rod into impacting engagement with said
source of electrical power and a current is passed through
them and through bridge wire 22. This results in ignition
of charge 23 and the generation of a disruptive gas pres
sure by propellent charge 6 which results in the breakage
of the bolt as described above. Whether the charge is
' ?red electrically or pneumatically, the ?ring pin func
tions to form a seal preventing passage of gas around it.
The explosive bolt as described above has been found
to be satisfactory and completely reliable and has been
designed to pass very rugged environmental tests, includ
ing a 40 foot drop test, a 15 G shock test, and acoustic
noise test.
?ring pin and thereby actuate said primer.
References Cited in the ?le of this patent
Allan ________________ __ Dec. 13,
Krammer _____________ __ May 3,
Temple _____________ __ Dec. 26,
Musser ______________ _._ Feb. 13,
Smith _______________ __ Sept. 29,
Nessler ______________ __ Apr. 28,
Musser ______________ _._ Aug. 23,
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