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Патент USA US2407264

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Sept w, 1946»
c. B. FERRE-rl.
2,407,264 f
Filed Oct. 20, 1942
Patented Sept. 1Q, 1946
Clyde B. Ferrol, San Francisco, Calif., ía'ssignor‘t‘o
Ferrel Industries, Inc., Reno, Nev., v‘a corpora
tion of `Nevada
Application @october 20, 1942, Serial No. '462,700
'3 Claims. (Cl. '102---99.)
This invention relates to projectiles for use in
rifles and -like iirearms, and particularly to their
Explosives may in general be classed in two
eliminated as an annular fin 5 projecting from
the body and 'formed integrally therewith has
been found to give suíiiciently to engage the
rifling and insure spinning action when the pro
groups, to wit, explosives of the burning type,
jectile is Vrlred.
and lexplosives of the detonating type. In the op
eration of rifles and guns, Iwhether they be of
small or large caliber, an explosive of the burn
projectiles of >this vtype have been employed, it
has ‘been 'found that the viin need only project
In a ‘S0-caliber »rifle in which
about t1¿i000 o'f an inch to insure satisfactory en
ing type is generally employed, as this produces
gagement with relation to the rifling.
The explosive charge employed is Vor the deto
a large volume of gas under high pressure which 10
nating type and is placed directly >in the cham
functions as the propelling agent for the projec«
ber 3. The charge is -divided into two sections,
Due to a general knowledge of explosives and
indicated at ‘B andC, and while both are of the
detonating type, one, to wit, the section C, is
also as aresult of numerous experiments per
formed, I have come to the conclusion and have 15 made of a more sensitive type, such as fulminate
of mercury, whilethe other vmay be of a less sen~
of explosive can be more efficiently employed as
sitive type, such as trinitro-toluene, or the like.
Trinitro-toluene has -been found satisfactory as
a kpropelling agent of projectiles than a burning
it may be compressed »and `molded into sticks b
type of explosive, -as Vmuch greater muzzle veloc
ity and _penetrating or striking force can be ob 20 which ‘are provided with a recess -6 at the inner
end and a cone-shaped chamber 'l at the outer
tained. This is due to the fact that I have de
end. .A >stick of 'this character is placed in cham
signed a projectile which utilizes and is impelled
ber 3 and then the V’disc C of fulminate of mer
not only by the “brisance” or impact of the wave
cury, and on top thereof is placed a compressed
of detonation set up by the explosive when det
onated, but also by the impact of a concentrated 25 thin disc of trinitro-toluene, or like material,
and directed compression wave produced by the
such as indicated at '8,`to~seal and retain the ex
plosive Vcharge -within the projectile. The disc '8
gases generated during detonation.
is -pressed into place andis sprung `into annular
The projectile and the manner in which the
demonstrated and proved that a detonatîng type
groove-9 tofinsure retention .andsealing
detonating type of explosive is employed is shown
by way of illustration inthe accompanying draw 30k In :actual practice, the projectile, constructed
and loaded as described, operates `substantially
ing, in which:
Fig. 1 >is an enlarged central longitudinal sec
When placed in a gun or `rifle barrel, such as
tion of the projectile;
shown at It! in Fig. 5, the rear ñaring end il of
Fig. 2 is a similar enlarged section of the rear
end of the projectile;
35 the projectile will engage and be held in place by
asimilar flaring .seat l2 kformed at the end of
Fig. 3 is a section of the primary detonating
the bolt :head 1'4 of the gun. This head also car
charge, to wit, iulminate of mercury or the like;
ries a firing pin l5 and when this strikes the disc
Fig. 4 .is a perspective View of the main det
8, a suíiicient blow is imparted to detonate the
onating charge, and
Fig. 5 is a longitudinal section of a portion of 40 fulminate of mercury, which in turn detonates
the main charge B. The waves produced by det
a rifle showing the projectile placed therein in
onation travel in the direction of arrows a, with
position to be fired.
a velocity of several thousand meters per sec
Referring to the drawing in detail, and partic
ond, and as the “brisance” or violence of the blow
ularly to Figs. l and 2, it will be noted that the
produced by the waves of detonation are direct
projectile is fairly long and has a main body por
ed against the flat face 4, the projectile will be
tion A terminating in a closed, pointed forward
propelled in a forward direction with a velocity
end 2. A longitudinally extending chamber 3 is
proportional to the intensity of the Waves ab
formed within the projectile, which is open at
sorbed in the forward portion of the projectile.
the rear end and terminates in a iiat face 4 at
Substantially simultaneous with this wave pro
the forward end. The body of the projectile is
pelling of the projectile compression Waves pro
made of steel as forces generated within it are
duced by the burning gases are also traveling
large. Steel equivalent to so-called cold rolled
in a forward direction with substantially the
or mild steel will, however, suffice, and for this
same velocity, and these waves also impact
reason a soft metal jacket 0f Copper or the like,
to engage the rif-ling of a gun barrel, may be 55 against the face 4 and thereby further aid in in
, 2,407,264
creasing the total force and increasing the ve
locity of the projectile when ñred.
An important feature of the present invention,
and one that must be thoroughly understood,
is the fact that the action of a detonating explo 5
While this and other features of my invention
have been more or less speciñcally described and
illustrated, I Wish it understood that changes
may be resorted to Within the scope of the ap
sive is much more powerful in the direction in
which the waves of detonation are traveling than
in the opposite direction in th'at the said waves
move in the path of least resistance which, in
the present case, is from the rear end of the pro
that if the charge be hollowed out or cone
Having thus described and illustrated my in
vention, what I claim -and desire to secure by
Letters Patent is:
1. A projectile of the class described compris
ing, a cylindrical body portion terminating in a
pointed forward end„A an elongated chamber
formed within the projectile, open at the rear
and terminating in a flat face adjacent the for
ward end, a wave producing propelling detonat
sh'aped, as shown at ‘l in Fig. 1, that theeffect
ing explosive filling the major portion of the
jectile, as the explosive wave-producing acceler
ating charge therein is consumed, to the forward
end thereof. In addition thereto, I have found
pended claims.
chamber said charge having a cone-shaped
chamber formed in its forward end with the base
of the cone adjacent the nat faced end of the
chamber in which the charge is placed, a pri
out perpendicular to the conical surface, and 20 mary detonating explosive charge rearwardly
thereof, a disc of explosive material covering the
these meet in the center, producing a much
primary explosive, and means for retaining said
greater acceleration effect than an ordinary det
disc and both charges against removal from the
onation wave. This action is just the same as
the intensification elîect produced where two
2. A projectile of the class described compris
waves meet in a piece of detonating fuse. Hence, 25
ing, a cylindrical body portion terminating in a
it should be clear that the projectile shown in this
pointed forward end, an elongated chamber
instance is not only propelled by the brisance
formed within the projectile, open at the rear
or impact against the face 4 of the detonated
and terminating in a ilat face adjacent the for
wave alone, but also by the wave of compres
sion produced by the cone-shaped chamber 'l 30 ward end, a wave producing propelling detonat
ing explosive filling the major portion of the
formed at the outer end of the main detonating
chamber said charge having a cone-shaped
charge. rI‘he pressure of the gases produced may
be utilized to a certain extent but is not de
chamber formed in its forward end with the base
of the waves acting upon the projectile are in
tensified considerably. The reason seems to be
that when the waves of detonation reach`the
cone-shaped hollow, Waves of compression start
pended upon, as the bolt head structure in this
instance is such that the moment gas pressure
of the cone adjacent the flat faced end of the
reaches a predetermined point the bolt begins
to recede and the gases are then permitted to
discharge and vent themselves to the atmos
phere, such release of the gases being desirable
as heat is thus quickly liberated and dissipated, 40
mary detonating explosive charge rearwardly
permitting a gun or rifle of this character to be
used for rapid ñre, such as machine guns and
the like, without excessive heating.
The disc 8, which retains and seals the main
chamber in which the charge is placed, a pri
thereof, a disc of explosive material covering the
primary explosive, and an annular groove formed
in the inner face of the chamber adjacent the
rear end thereof -to receive and retain the disc
in engagement with the primary charge.
3. A projectile of the class described compris
ing, a cylindrical body portion terminating in a
pointed forward end, an elongated chamber
explosive charge and the primary detonator, is 45 formed within the projectile, open at the rear
both combustible and explosive in itself and is,
and terminating in a flat face adjacent the for
of course, completely converted into gas just as
ward end, a molded compressed wave producing
the main and primary charges are when the
propelling explosive detonating charge filling the
projectile is detonated. Hence, when the pro
major portion of the chamber, a primary ex
jectile discharges from the end of the barrel and 50 plosive detonating charge disposed in Contact and
the gases have escaped, no residual matter will
rearwardly thereof, means for sealing and retain
remain and the barrel is thus clean and open to
ing both charges within the chamber, and a cone
receive the next projectile.
shaped chamber formed in the forward end of
While I h‘ave particularly referred to fulminate
the molded compressed charge to concentrate and
of mercuryv as a primary detonator, and trinitro 55 direct the said propelling waves produced by det
toluene as the main charge and less sensitive
onation against the flat face at the forward end
detonator, it is obvious that many other types
of the chamber in unison with a detonation wave
of detonating explosives may be employed. For
produced by detonation of the explosive detonat
instance, in place if trinitro-toluene I may em
ing charges.
ploy dynamite, picric acid, gun cotton and simi 60
lar detonating materials.
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