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Патент USA US2412636

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Dec. 17, 1946.
Filed Feb. 18, 1943
Patented Dec. 17, 1946
Short, Canton Center, Conn.
Application February 18, 1943, Serial No. 476,300
8 Claims.
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757), -
The invention described herein ‘may be manu
factured and used ‘by or for the Government for
governmental purposes without the payment to
me of'any royalty thereon.
‘ holding function to opeting lever 9, which-le
ver, asis usual, is integral with the fuse cap
. such as that designated by' Hi. The lever's posi~
tion normally,‘ relative to the grenade body, is
that shown, wherein it .will be grasped together
with the body in the act of throwing the grenade,
and when the whole device is free of the hand,
the cap and lever are kicked off by the striker
and the released striker then strikes the primer
to inaugurate the functions of the powder trains
to set off the main bursting charge.- All of ‘the
parts and their functions, thus far described, are
old and well known in the art.
Communicating with the chamber 3 is a cylin
This invention relates to a combined tlme'and
percussion fuse especially adapted for hand gre
nades, although not limited to such use.
The object of the invention is to provide a ’
dependable fuse that will explode the main gre
nade charge after a predetermined calculated
time or delay period, but upon impact will cause ’
instantaneous explosion- of the main'charge if
the delay period has not‘ expired or if the delay
elements fail to function.
In the drawing:
’ Fig. 1 is a central vertical section of the fuse,
applied to a grenade.
drical chamber ll of a little less diameter than
the conventional chamber, thus presenting a
shoulder l2, forming a seat for a'seal I3 protect
Fig. 2 is a cross section taken on the line 2-2
ing the primer M in chamber ll. Below the
of Figure 1, showing the preferred form of the
primer chamber is a bore l5 separated from the
safety plug in the upper part of the fuse.
20 chamber ‘I I, by an. apertured web l6, the aper
’ Fig. 3 is a similar view taken further down and
ture establishing ‘communication between the
on the line 3-3 of Figure _1.
chamber and bore for the ignition of a' com
Figure 4 is a view, of the fuse taken still lower
pressed powder delay pellet il formed with a
down and on the‘ line 4-4 of Figure 1, showing a
‘central opening to receive a needle 23 and adapt
preferred arrangement of the‘quick match ele
ed to burn away therefrom, for a reasonto be
ment with relationto the detonator.
' v
explained. The pellet n is' contained in shell
Fig. 5 is an enlarged sectional view of the fuse
l8 which is open at its lower endand ?rmly se
in the neighborhood of the detonator.
- cured in the bore I5. supported'in the upper
Fig. 6 is a vertical sectional view showing the
end of the shell is a plug l9, formed with a small
\ relation between the packed powder delay trains 30 concave central depression 20 in line with and
and the means for locking and keeping them
immediately below the central aperture in the
locked in separated position under. some condi
web IS. The plug is preferably perforated at
three points in its perimeter with openings 20'
Fig. 7 is a similar view of thesame parts, in
and it is further formed, preferably, with a cen
slightly modi?ed form.‘
In the fuse about to be described, some; parts '
are old in the art, as for instance the Bouchon
head is adhered to, especially inv so far as its
upper structure is concerned, which involves the
throw-off cap,'the operating lever and the striker;v
but the parts below‘ the head proper present a.
novel arrangement.
In the drawing, l designates the grenade body,
tral comparatively sharp point 2!, to be received
in a slight depression 22, in the upper end of the
needle 23, whose lower end is pointed and re
ceived in a correspondingly shaped recess 24, in
the upper enlarged head 24' of a tube 25 the bore
‘of which merges ‘into ducts 26, at the upper end
vof the bore. The'bore, as well as the ducts, con
tain a'compressed powder pellet 26'. Near the
lower end of the tube a slight reduction in diam
which is of the usual or common construction -
eter forms a shoulder which engages the edges of
wherein the body is scored for greater fragmen
tation. The numeral 2 designates the fuse head
provided with a chamber 3, having its top and
a circular opening in a ring 28, ?rmly secured in
the lower portion of a tubular extension 29 of
one side open. Integral ears 4 are providedvat
one side of the chamber to support the short
' the head 2.
The ring may be held inthe ex
tension by crimping as shown, and its underside
is a little above the end of the extension, which
shaft 5, upon which the spring steel wire striker 50 extension is slightly inturned to form an annu
6 is‘mounted, and ears 1, apertured for the pas
lar flange 30, forming aseat for the ?ange 3|
sage of the cotter pin safety 8, which engages an
of the detonator 32, which is held ?rmly in place
arm of the striker to render it inoperative until
by reason of the engagement‘ of‘its ?ange with
such time as the grenade is to be thrown, when 1
the underside of the ring 28. The ring has a
the pin will be withdrawn, transferring the striker‘
cone shape concavity in its underside into which.
train for igniting said detonator and having a
portion thereof for retaining said dislodgable
the slightly reduced lower end of the tube ex-.
tends, the end of the tube with the wall of the
ring forming an annular recess which is packed
means in locking position to render said friction
device inoperative, said locking means adapted
to be dislodged only after that retaining portion
with quick match material 33, ignited by the
> roughened portion 34 of the tube upon the move
ment of the tube, which movement occurs under
of the fuse train in contact with said dislodgable
means has been ?rst ‘consumed and then upon
certain conditions presently to be described.
impact of said body to permit the spring urged
Interposed between a shoulder 35, adjacent the
member to ignite the friction primer, to cause
upper end of the tube, and a washer 36, prefer
ably of lead, which rests on the ring 28, is a heli 10. instantaneous explosion of the charge uDOn im
pact of said body.
cal spring 36' urging the tube toward theshell
2. A grenade fuse comprising a hollow body
l8, but the tube is prevented by the needle 23
containing an explosive charge, a closure for said
from reaching the shell until such time and un
body having an extension extending into said
der such circumstances are are contemplated for '
charge, a percussion primer in said closure, a
the organization.
delay powder train in said closure ignitable by
As shown in Figure 1, the grenade body is
the percussion primer, a detonator carried by the
threaded on the fuse head in the usual manner,
extension within the explosive charge, a chan
with the usual washer, ordinarily of steel, hav
neled member in the extension having one end
ing a lateral extension engaging the operating
in contact with the detonator and the other
lever and serving to seal the Bouchon.
spaced from said delay powder train and having
Referring to Figure 7, there isshown a slight
a friction device, a friction primer in the exten
modi?cation of the form of the plug l9 and its
sion in proximity to the friction device, dislodg
associated needle, with the needle pointed at its
able means supported by said powder train and
upper end and a shallow cavity in the bottom
in engagement with the channeled member to
of the plug.
normally prevent movement thereof, means caus
In operation the safety pin 8 is withdrawn, and
ing movement of the channeled member upon
the grenade with the lever pressed against its
dislodgment of said dislodgable means to ignite
body is thrown. As soon as the grenade leaves
the friction charge upon impact of said hollow
the hand, or other instrumentality by which it
may be thrown, the striker 6 will kick the lever 30 body, and a second delay powder train in the
channeled member communicating with the det
and cover off, permitting the striker to strike the
onator and ignitable by the first mentioned pow
primer H, which will ignite the compressed pel
der train and capable of igniting the detonator
let H, which in proper time, will ignite the pellet
independently of the operation of the friction
26' in the tube 25, and after a predetermined
time, ?gured in seconds, the pellet 26' will ignite
3. In a combination time and impact fuse, a
the violent charge in the detonator 32. This is
hollow body containing an explosive charge, a
the normal and expected action of the fuse.
However, should the grenade land before the ' delay powder train in said body, means for ig
niting the train, a second delay powder train
powder trains have gone through their predeter
mined and completed routine, the impact of land
ignitable by the ?rst powder train, a detonator
ing will cause an instantaneous explosion of the
main charge for the reason that‘ by the time im
within the charge and ignitable by the second '
powder train, a separate means capable of ignit
pact occurs the powder pellet H, in which the
ing the detonator independently of the second
powder train, and means retained by said ?rst
delay powder train and operable upon the same
being ?rst consumed and then upon impact of
said body to release said separate means to ignite
said detonator to cause instantaneous explosion
of the charge.
4. In a combination time and impact fuse, a
hollow body containing an explosive charge, a
percussionv primer and a delay powder train in
‘needle 23 is embedded will have been consumed,
but not necessarily the other powder train 26'
in tube 25. As a result, the needle 23 will then
be left unsupported except at its ends by the plug
l9 and the head 24’. The shock of impact will
cause the needle 23 to assume an unstable tilted
position thus disturbing the alignment between '
the needle 23 and its supporting elements l9 and
24'. The head 24', tending to be moved up
wardly under the influence of the spiral spring
36', will further disturb this alignment resulting
in a dislodgement of the needle 23 to permit the -'
pretensioned spring 36' to raise the tube, and in
so doing, the roughened end 34 thereof will in
stantly ignite the detonator charge.
Thus, the shock of impact, irrespective of how
the grenade lands, will be su?icient to cause dis
lodgement of the needle 23. Should the grenade
by chance ?rst land or hit end-?rst, it would not
remain on end but would tumble or turn over due
to its momentum which would cause dislodge
ment of the needle 23 permitting the tube 25 to
function in the manner already explained.
said body and ignitable by the percussion primer,
a movable member spaced from said train and
containing a second powder train ignitable by the
?rst train, a detonator within the charge and ig
nitable by the second train, a detonator igniting
primer capable of igniting the detonator inde
pendently of the second train upon the movement
of said movable member, means normally locking
said member against movement, said means being
dislodgable upon impact, and means causing
movement of said member upon dislodgment of
said locking means to ignite the detonator primer
to cause instantaneous explosion of the charge.
5. In a combination time and impact fuse, a
,hollow body containing an explosive charge, per
cussion primer and a delay powder train in said
1. In a fuse, in combination, a body containing
body and ignitable by said primer, an extension
an explosive charge, a detonator in said charge,
a friction primer for igniting said detonator, a 70 carried by and within said body and having a
detonator in said charge, a movable tubular mem
member having a friction 1-portion for igniting
ber in said extension spaced from said train and
said primer, spring means for urging said mem
containing a second powder train ignitable by the
ber relative to said friction primer, dislodgable
?rst train, said detonator being ignitable by the
means for normally locking said member against
movement relative to the friction primer, a fuse 75 second train, a detonator igniting primer capable
I claim:
second train, means interposed between the ?rst
vided with a powder train extending between‘ said .
powder train and said member normally locking
said member against movement, said interposed
means being dislodgable upon impact of the body,
and means causing movement of said member
upon dislodgment of said locking means to ignite
friction member, a movable friction member hav
ing a friction portion in' said primer and pro
of igniting the detonator independently of the
pellet and detonator and capable of igniting said
detonator, a dislodgable member embedded in
and normally at least partially supported by the
' pellet and adapted to be dislodged upon impact
the detonator primer to cause instantaneous ex
plosion of the charge.
of the body after the destruction of said pellet,
said dislodgable member having a portionengag
6. In a combination time and impact fuse, a 10 ing the friction member normally holding said
member against movement, and means for mov
hollow body containing an explosive charge, a
closure for said body having a hollow extension
extending into said charge and having a detona
tor at its inner end, a percussion primer in the
closure, a shell in the closure and containing a [5
compacted delay powder pellet ignitable by said
ing said friction member when released by said
dislodgable member to ignite the friction primer
and thereby the detonator.
8. In a grenade, a body having an explosiv
charge, a detonator for said charge, means for
instantaneously igniting said detonator, means
including an element in alignment with and hold
ing said igniting means in an inoperative posi
taining a delay powder train capable of igniting
tile detonator, a. pretensioned spring normally 20 tion, a percussion primer in said body, a time
delay fuse train adapted to be ignited by psaid
urging said tubular member toward the shell, a
primer and in turn ignite said detonator, said
second primer actuated by said tubular member
upon the movement of said member to ignite the _ time-delay fuse having a portion thereof re
taining said element in position to hold said
detonator upon impact of said body independ
ently of the powder train in said member, a pin 25 igniting means in the inoperative position, said
holding means becoming inoperative to hold said
embedded in the powder pellet and in engage
igniting means in the inoperative position only
ment with said plug and with the tubular mem
after the said portion of the time-delay fuse re
ber, to ,hold said member normally separated
from the shell, said pin being adapted to be _ taining said element has been ?rst consumed
dislodged upon destruction of the powder pellet 30 and-then upon impact‘ of the grenade body,
whereby after a preliminary predetermined peri
and upon impact of said body, and means caus- '
- od has elapsed after ignition of the delay fuse.
ing movement of said tubular member upon dis
train has been initiated by the percussion primer
lodgment of said pin to ignite the second, primer
and in which period said‘ retaining '; portion of
and cause instantaneous explosion of explosive
35 said time-delay'fuse‘ will- have been consumed, ,
7. In a time and impact fuse, in combination,
said detonator-will'be ignited either by the time
a hollow body having an explosive charge therein,
delay fuse trainvat the termination of its delay
a percussion primer, a compacted powder pellet
period or by said ?rst-mentionedigniting means
primer, an apertured plug in said shell, a mov
able tubular member in said extension and con
ignitable by said percussion primer, a. friction
‘ primer in said body, a detonator adjacent said 40
upon impact of the body: whichever occurs ?rst.
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