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Патент USA US3097573

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July 16, 1963
Filed July 21, 1961
J} ?aw; a. J, @uWz M. W
Unite j grates
Thomas Stevenson, 1039 Arthur Ave, Huntingd‘on
Valley, Pa.
Filed July 21, 1961, §er. N . 125,381
2 Claims. (Cl. 89—ll.'7)
(Granted under Title 35, U.S. Code (1952.), sec. 266)
Patented July 16, 1963
sliding type closes hole 24. A spring 26 cooperates with
a head 2'7 on an extension of the slide valve 25 and with
the connector 23 to bias the valve to its closed position
with the ?ash hole closed against the admission of ?ame
to the propellant 1'7 and 2%. On pulling linkage 28' the
valve 25 is moved to the left until the hole through it is
‘brought into axial alinement with the flash hole 24. On
later ?ring the spotting ri?e cartridge its ?ame after pres
The invention described herein may be manufactured 10 sure starts the projectile 29 outwardly, is enabled to
travel through hole 24 igniting the cartridge case 19 ‘and
and used by or for the Government for governmental pur
priming material 20 for igniting propellant l7 and ?ring
poses without the payment to me or“ any royalty thereon.
projectile 14. The metal 50 caliber cartridge case 30 con
This invention relates to means for ?ring the larger
tains the usual propellant for the projectile 29. While
caliber gun of a spotting ri?e combination and has for
an object to simplify the ?ring apparatus for that larger 15 getting onto a target with valve 25 closed the mission of
propellant in cartridge case 3% is to start projectiles 29
gun in order that it may be ?red by the spotting ri?e.
with a uniform velocity.
A prior patent 2,981,151 dated April 25, 1961, for “lg
When a spotting projectile had hit the target and it is
nition System ‘for Caseless Rounds in Open Breech Type
desired to ?re the large gun, a rear trigger 31 on the
Guns” disclosed the use of a blank cartridge for ?ring
spotter may pull valve 25" to the left to its open position
such a gun from the outside of it in order to eliminate the
and hold this valve open while pulling a second or for
disadvantages of the previously used apparatus for ?ring
ward trigger 32 for ?ring the spotter. At this time there
such guns.
is no need to hope for projectile 29 to get on the target
According to this invention it has been discovered that
again under reduced pressure but it is only necessary ‘for
the barrel of the usual spotting ri?e may be close enough
the spotter propellant to be able to push projectile out of
to the propellant chamber of the larger gun on which the
the spotter barrel to be ready for ?ring another spotting
spotting ri?e is mounted for the propellant in the larger
shot later. Whether or not the smaller projectile falls
gun to be ignited by the propellant ?ame from the spot
short in ?ring the larger gun should be of no importance
ting gun. For this purpose an enclosed passageway has
but it is necessary that the ?ame be able to pass through
a diameter of about 75 % to about 50% of the bore of the
?ash hole 24- and ignite the propellant of the larger gun.
spotting ri?e barrel and extends from the front end of
soon as propellant in cartridge 34} causes projectile 29
the spotting cartridge case into the propellant chamber
to clear the ?ash hole 24, then the igneous gases ‘are en
of the larger gun. In order that the spotting ri?e may
abled to penetrate to ?re propellant 17. The diameter
be ?red without ?ring the larger gun a valve closes said
of the hole 24‘.- should not be larger than the spotter bore.
passageway against the admission of any ?ame into the pro
If this hole 24 is too small it will fail to get enough heat
pellant in the large gun in advance of it being ready to ?re
and pressure to the large gun propellant. In practice a
but such valve is opened in response to a trigger pull and
hole % of an inch or 75% of the diameter of the spotter
held open while the spotting ri?e is being ?red latter get
bore (1/z inch) was found suitable.
ting on the target.
Any of a number of well known types of trigger mech
Referring to the drawing, the single ?gure shows the
present invention embodied in a spotting ri?e combina 4.0 anisms may be used. For example two triggers ion the
spotter will enable one of them to pull linkage 28 for
tion with ‘a larger gun.
opening valve 25 and hold it open while ?ring spotting
A usual 50 caliber spotting ri?e It} is ai?xed to a larger
ri?e 10 for ?ring the large gun. On release of both
caliber 90 millimeter open breech type recoilless ri?e 11
triggers the spring 26 closes valve 25 for re?rin-g of the
utilizing caseless propellant for a ?n stabilized projectile.
spotting ri?e in its usual mission of striving to get on
The central open breech 12 is provided with an expansible
target. A stop 33 limits movement of the valve 25
venturi nozzle 13 capable of holding the ammunition in
place when the muzzle is elevated. Instead of this type
venturi, a bar type breech closure having a venturi open
ing on each side of it may be also used. Within the larger
gun 11 is shown a ?n stabilized round of ammunition
which includes a projectile body portion 14, and stabiliz~
ing ?ns 15 mounted from the boom 16. Around the boom
are disc type sections of propellant 17. A rotating band
18 initiates a low rotation rate for the projectile of be
tween about 10 to 20 revolutions per second on coopera
tion with the lands and grooves in the gun barrel. The
cartridge case 19 is preferably of the consumable type
that offers minimum resistance to a ?ame from the spot
ting ri?e being admitted for ignition of propellant 17.
Black powder 24) or other priming mixture is shown
around the boom 16 within the propellant discs 17, be
tween some or all of the discs and radially through the
cartridge case where the ?ame from the spotting ri?e
The spottintr ri?e barrel 21 is provided with a front sup
port 22 and a rear support constituted by a connector 23
threaded into the spotting ri?e and large gun as shown.
Extending through connector 23 is a ?ash hole 24 of
about % of an inch in diameter ‘for the 1/2 inch or 50
caliber bore. To close hole 24 ‘against the admission of
?ame to the large gun during the ?ring of the spotting
ri?e while striving to get on a target, ‘a valve 25 of the
to insure the hole in the valve being in alinement with
the hole 24 in the connector.
In practice the spotting ri?e will have a magazine, not
0 illustrated, because projecting on the far side of the
smaller gun to enable this smaller gun to be mounted
closer to the larger gun than if the usual magazine were
placed below the smaller gun and between it and the
larger gun.
With the magazine so placed the triggers
31 and 32 may also be on the far side close to the maga
zine, but for simplicity in disclosure these triggers are
shown between the guns.
Among the advantages of this invention may be men
tioned the fact that the ?ame and hot gases from a stand
ard 50 caliber spotting round possess enough energy in
the portion coming through the side ori?ce to pierce sub
stantially instantaneously the plastic envelopes used for
containing the major caliber propellant. In other words
this ?ame does not have to be gradually burned through
65 such an envelope but has su?icient explosive force to
blast through the envelope. Another advantage is the
elimination of the need for carrying and using special
cartridges for ?ring the larger gun, which cartridges are
in addition to the spotter cartridges as was contemplated
in said prior Patent 2,981,151 dated April 25, 1961 men
tioned above which eliminated the need for rear end con
nections to the major caliber round having to be made
in combat under all weather conditions.
The term “caseless round” has its usual signi?cance and
includes not only those rounds having no case but also
those having a case which does not have to be extracted
from a gun barrel but has been disposed of by combus
tion or by being frangible.
I claim:
1. In a combination of a recoilless weapon with a spot
ting ri?e secured thereto and of substantially smaller
caliber than said weapon, each of said weapon ‘and ‘spot
ting ri?e having a chamber in which a projectile is adapted
to be located for ?ring, and each of said spotting ri?e and
weapon having a propellant chamber in rear of said pro
ri?e bore, and a valve by which said passageway may be
opened or closed to allow or prevent the passage of an
igniting ?ame to said weapon, said spotting ri?e being
provided with a trigger means by which it is ?red and
a connection between said valve means and at least a por
tion of said trigger ‘means whereby said valve means may
be controlled by said trigger means to which connected.
2. A combination according to claim 1 in which said
valve means is slidable, a spring controls movement of
said valve means in one direction, and said trigger means
includes two triggers, one by which said spotting ri?e
may be ?red while said passageway is closed and the other
by which said valve means is moved to open said passage
jectile chamber, the combination therewith of the im
way and ?re said weapon on ?ring said spotting ri?e.
provement for rendering a service round in said spotting
References Cited in the ?le of this patent
ri?e capable of ?ring a propellant in said Weapon, said
improvement including a short direct enclosed ?ame pas
sageway leading from adjacent a propellant chamber in
said spotting rifle into a propellant chamber in said wea
pon and generally radially through a side wall of said
Weapon propellant chamber for igniting ‘a caseless pro 20
pellant when in said weapon from an ignited round of
propellant in said spotting ri?e, said passageway having
a diameter of between about 50% to 75% of the spotting
Aasen ________________ __ July
Crowe _______________ -_ Apr.
Mattlet ______________ __ Mar.
Smith _______________ __ Mar.
Musser ______________ __ Sept.
Stevenson ____________ __ Apr.
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