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Dec. 24, 1946.
Filed March l, _1943
2 Sheets-Sheet 1
Trank Shari
Dec. 24, 1946.
2,41 3,004
Filed March l, 1945
2 Sheets-Sheet 2
T?‘ank Eh nrt
A Patented Dec. 24, 1946
Frank Short, Cantonv Center,A Conn.
Application March 1, 1943, Serial> No. 477,583
3v Claims.
(Cl. 1102-64)
(Granted under the act of March s, 1883, as
amended April 30, 1928; 370 0. G. 757)
The invention described herein may be manu
I0 an L-shape member I2, in which is supported
factured and used by or for the Government for
and works the firing pin or striker I3 provided
governmental purposes without the payment to
with a head I!! between which and the member
me of’ any royalty thereon.
I2 is interposed a spiral spring Ill', keeping the
This invention relates to hand grenades.
5 firing pin normally away from the primer 3’ on
The object of the invention is to provide a
the detonator 3.
simple and eifective weapon of this class in which
As illustrated, the pivoted member I2 and the
the ñring mechanism is remote from the primer
firing pin are in unarmed position by reason of
when the grenade is in unarmed condition, but
the contact between the arm I 2' of said member
which will be quickly brought into armed con
and the underside of the safety cover It of the
dition, when the safety cover is removed.
safety lever I5. ' The safety lever is apertured
Another object is to provide a grenade that in
at I8 for the passage of an eye I9, on the periph
use under some conditions of warfare, comprises
ery of a clamping ferrule 20, the eye receiving
a comparatively large part that performs an im
a Cotter pin 2I,`which, as usual, is removed be
portant function, may be telescoped, upon the
main body of the grenade whenk being carried
or to facilitate shipment, or when the weapon
is used under conditions where it is not desirable
to use a tail device.
The invention contemplates a combination of
a novel striking device with a well known striker,
and a combination with a well known grenade
fuse with a novelly arranged fuse, the object
being to assure the explosion of the grenade re»
gardless of the position in which it lands.
Fig. 1 is a central vertical section of the gre
nade some of the parts being in section, the
detonator shell being partly broken away.
fore the >grenade is thrown. The ferrule 2li, has
an inturned annular lip 22 under which extends
a narrow'tongue 23 opposite the point of mounte
ing of the safety lever on the ferrule, the lip and
tongue acting as a fulcrum for the safety lever
and cover when they are thrown off. Thel means
for throwing or kicking off the cover and lever,
comp-rises a spiral spring 24, attached at one end
to an eye 25 on the arm I2’ and at the other
to a similar eye 26 on the inner periphery of
the ring 8, the spring exerting a constant and
strong pull tending to rock the member I 2 to--
gether with its firing pin, on the pivot IQ, which
movement of said member kicks the cover off
Fig. 2 is a sectional plan aboutl on the line
when the lever I5 is released in throwing the
2_2 of Fig. 1.
30 grenade. Obviously,- when the spring 2li, acts to
Fig. 3 is a plan view.
erect the member IZ, the member brings with
Y Fig. 4 is a vertical section of about theV line
it the ñring pin I3, and positions it as shown
4-«4 of Fig. 2.
in dotted lines Figure 1, wherein the said mem
Fig. 5 is a view partly in section, showing the
ber will engage a stop pin I2” in ears 9' on the
grenade body proper enveloped in what, in use, 35 bars 9.
is the tail cone or tail of the device useful in
The lower part of the body I, is reduced in
certain kinds of warfare.
diameter to form a cylindrical sleeve 2l, against
Figure 6 is a perspective view of the throw-o
which is suitably ñtted an annular truncated
cover of the grenade.
ring 23 of Wood or plastic material. To the outer
On the drawings the numeral I, designatesthe 40 periphery of' this ring is secured in any suitable
main body of the grenade, which may be made
manner, the upper end of a truncated tail cone
of heavy cardboard or plastic. The body> is pref~
29, which may be conveniently made of wood
erably conoidal in shape and contains at its lower
or plastic. This cone is retained in place by a
end a block 2, which may be of wood or plastic,
catch spring 30 through the upper loop of' which
the block fitting snugly in the body and support
ing a detonator 3 having a primer 3' the deto»
nator extending through the solid explosive
charge f3 in which there is a chamber or space
5 to permit the operation of the firing pin assem
bly, the parts of which will presently be described.
The upper end of the body I is formed with
annular corrugatlons 6 that cooperate with sim~
ilar corrugations 'I on the outer periphery of
45 passes a pin SI vsecured to the sleeve.
The spring
as shown, has laterally extending arms 32, that
iit under the lower surface of the ring 28 and
hold the grenade body and tail cone together, it
being only necessary to compress the springs suf
ficiently to permit its arms to pass through the
sleeve 21 to remove the cone.
The shape of the hollow cone 29 and the gre
nade body is the same, thus permitting the cone
a metallic ring 8, having formed integrally there
to be removed from its relationship to the body
with, cross bars 9 between which is pivoted at 55 as shown in Figure 1, and inverted or reversed
and slipped over the -body as shown in Figure 5,
rendering the whole device more compact for
carrying or shipping or for use where the tail
cone is not necessary or desirable. It'will be
noted that in this changed relative position be
grenade is thrown and the safety and protective
coveris kicked off by the joint action of the arm l‘2
under the influence of its spring 24, and the ham
mer 37, under the inñuence of its spring. If the
grenade strikes head down or in position to op
erate the íiring pin I3, the fuse in the detonator
3 will be immediately ignited and will explode the
taining spring remains in the sleeve as before,
charge in the predetermined time for such ac
with its arms 32 in readiness to support and re
tion, but should it fall on its side, or in some posi
tain the cone in its nested relation with the gre
nade body, the arms in this case engaging the 10 tion other than that in which the firing pin will
narrow end of the ring 28, instead of the wider` j j_' bev operated, the other fuse 39 will have simulta
neously been ignited and is standing guard
against the failure of its companion fuse.
In Figure 1 part of the detonator shell is bro
I claim:
ken away, showing the detonating arrangement
1. A grenade comprising a body having a
preferred, in which the main part of the deto
tween the cone and grenade body that the re
nating charge a is comparatively low down in '
chamber therein, an explosive charge, a primer
the main explosive charge, and ignited by rne
carrying detonator in said charge with its primer
dium such for instance as a Bickford fuse b.
end in the chamber, a throw-off cover for the
chamber, a pivoted member in the chamber, a
I desire it understood however, that I do no-t limit
myself to the use of any particular fuse, as the
kind will be used best suited and most appro
priate to grenade practice, as dictated by the
exigencies of the case.
spring-backed firing pin slidable in said member
and having a portion extendable beyond the said
body and adapted to operate the firing pin upon
impact, said pivoted member being in contact
with the cover to hold said member and firing pin
To better denne the chamber 5, and stabilize
with certainty the explosive charge, and to make 25 in unarmed position, and spring means normally
urging the pivoted member and its ñring pin to
the weapon more effective upon explosion, I pre
armed position against the resistance of the
fer to provide a conical lining 33 of metal, which
throw-off cover.
by the explosion of the main charge is formed
2. A grenade comprising a body partially filled
into a destructive slug to increment the other dis
30 with an explosive charge, a primer carrying
seminated parts.
detonator positioned to detonate said charge, a
Having described in detail one set of parts and
firing pin mechanism in the body and including
explained the manner of their operation, which
a spring-backed ñring pin pivotally mounted in
ordinarily will result in the explosion of the
said body and positioned transversely thereof,
grenade, I will now describe the additional means
said iiring pin having a portion extendable be
for surely exploding it, regardless of the position
yond the grenade body to operate the firing pin
in which it may land, or whether it lands at all.
upon impact, a throw-off cover for the body,
'I‘he numeral 33’ designates a platform which
connections between the firing mechanism and
is preferably made integral with one of the cross
the cover whereby the firing pin is held in un
bars il, there being two ears 34 integral with the
platform for the passage of the pin 35 upon which 40 armed position by said cover, and spring means
urging the firing pin into axial alignment with
is mounted the usual spring 36 with one end ex
the detonator against the resistance of said
tending through an aperture in the platform and
throw-off cover.
the other located beneath the hammer 31. The
3. A grenade comprising aV body having a
throw of the hammer under the inñuence 0f the
charge chamber, an explosive charge in said
spring 3E, when the cover flies off, brings it into
chamber, a primer and detonator axially disposed
contact with the primer' 3B securedin the plat
in said chamber, a rockable member in the cham
form. Connected with this primer is a second
ber positioned normally transversely of said body,
fuse 39 which may be of any suitable kind, but
a spring-backed iiring pin slidably mounted in
preferably of the Bickford type. This fuse is cut ,
said member and having a portion extendable be
into the detonator 3’ at a point a suitable dis
yond the chamber in armed position and adapted
tance below the detonator’s upper end as shown.
to operate the iiring pin upon impact, a throw-off
For the explosion of the grenade by the ñring
pin I3 contacting with the primer 3', the grenade
must strike head down which, guided by the
»lighter appendage in the way of the guide cone
39, it will ordinarily do. However, with the addi
cover for the chamber, an extension on said rock
able member in engagement with the cover to
maintain said rockable arm in unarmed posi
tion, means urging said member into axial align
ment with said primer, a second primer in the
tional mechanism of which thehammer 3l is a
chamber having a fuse connecting with said
part, an explosion will be assured regardless of
detonator, a hammer pivotally mounted adjacent
whether or not the firing pin. head I4 strikes an
object, because when the grenade leaves the hand 60 to last mentioned primer and held inoperative
by engagemement withthe throw-0H cover, and
or other instrumentality by which it is thrown
spring means vnormally urging said hammer to
and is on its way, it will obviously be doubly
armed position against the resistance of said
throw-off cover.
In throwing the grenade, it is grasped around
the body, the grasp including the safety lever l5.
The cotter pin having been first removed, the
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