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22, 1946-
2,409,637
v. F. LUCHT
,MUZZLE CLOSING MECHANISM
Filed June 2, 1945
2 Sheet`s-Sheet l
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Víctor F. Lucht v
v. F. LUCHT
2,409,637
MUZZLE CLOSING MEC'HANISM
Filed June 2, 1943
2 Shee'ßS-Sheet 2
Patented Oct. 22,- l1946
2,409,637
UNITED STATES PTENT OFFICE
2,409,637
MUZZLE CLOSING MECHANISM
Victor F. Lucht, Washington, D. C.
Application June 2, 1943, Serial No. 489,351
10 Claims.
(Cl. SSI-_31)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757)
l
The invention described herein may be manu
factured and used by or for the Goverment for
2
.
Fig. 3 is a cross-section on line 8-8 of Fig. 2;
Fig. 9 is an enlarged detail of the V-notched
governmental purposes without the payment to
finger, and
me of any royalty thereon.
Figs. 10 and l1 illustrate the mechanically op
erated electric switch referred to herein.
The muzzle-closer comprises a number, four
This invention relates to muzzle closing de
vices for guns of fairly large calibre, for example,
being shown in the drawings by way of example,
of segmentary numbers IU which come together
in the closing condition of the device, as shown
`their recoil, are usually placed in the fuselage of 10 in Fig. 1 and Fig. 2, in the fashion of a clamshell
bucket. Each of the segmentary members is pro
the aircraft and fire forwardly of the plane. Un
'75 mm. and more particularly, for aircraft-car
ried guns of this calibre range. Such guns be
cause of their size and weight and the force of
vided internally with an inclined cam surface to
der such conditions the air ñow aft'of the plane
engage the gun barrel, as shown in Figure 3, for a
blows through the gun barrel when the breech
purpose to appear and is pivoted at pin I2 to an
is opened into the cockpit of the aircraft. Con
annular` member I4 which is secured at the muzzle
siderable of the toxic gases of the products of the
end of a long tubular member I5. To provide for
explosion remain in the gun barrel upon the ñr
the said pivoting of the segmentary members I0 to
ing of a shell, and are carried with the indraft of
the said annular member I4, the segmentary
air through the breech when it is opened follow
members are provided on their inner surface with
ing the gun discharge. The gas entering the
cockpit is especially injurious to the crew because 20 an L-shaped lug I I, the distal end of which is
apertured for the said pivot pin I2. The tubular
of the enclosed nature of the cockpit and the con
member I5 is spaced from the gun barrel I, see
fined space thereof.
Figs. 2 and 3, a sufficient distance to provide
The object of this invention is to provide a muz
clearance for an internally splined tube I6 which
zle closing device which would rectify this condi
is secured, «at or near the midpoint of tubular
tion by closing the muzzle to the air stream ex
member I5, to the internal face thereof. The
cept when the gun is fired, at which time the
internally disposed serrations, i. e. teeth elements
breech is of course closed, so that there will be
and channels, of the splined tube I6 are clearly
no air inrush during firing. Allied with this ob
seen in Fig. 4. An external splined ring B secured
ject, a further object is to provide a muzzle clos
ing device which will close the muzzle immediately 30 to the gun barrel I is provided with teeth which
are receivable in the grooves of the internally
after its discharge, at which time there will be
splined tube I6 and the teeth of the latter are re
the maximum residue of toxic gases in the barrel;
ceivable in the channels of the external splined
moreover, the breech is soon after opened for re
ring 6. It should be noted that the internally
loading and would permit such gases to be blown
into the cockpit were the muzzle allowed to re 35 splined member I6 secured to the inner surface
of the annular tubular member I 5 is of consider
main open to the air flow.
able length-hence herein termed a “tube”-comFor the attainment of these and such other
objects of invention as may herein appear or be
pared to the externally splined member 6 secured
to the outer surface of the gun barrel-hence
pointed out, I have shown an embodiment of my
`
invention in the accompanying drawings, where 40 herein termed a “ring”
Tubular member I5 together with its annular
1n:
‘
head I 4 and the segmentary closing members piv
Fig. 1 is a top view of a gun showing the muz
oted thereon, and together with the internally
zle device in closed condition;
splined tube I6 are longitudinally movable from
Fig. 2 is a longitudinal section throughv thev
gun, with the muzzle device in closed condition; 45 the muzzle-closing position, shown in Fig. 2,
rightwardly to the muzzle-opening position ofY
Fig. 3 is likewise a longitudinal section, but
Fig. 3, and return in the opposite direction. In
with the muzzle device in open condition;
this longitudinal adjustment, tubular` member I5
Fig. 4 is a cross-section taken on the line 4_4
moves between gun barrel I and an outer tubular
of Fig.2;
Figs. 5a to 5f are schematic illustrations re 50 member 25 which is secured at its right end, to
the breech casing 2 of the gun.
ferred to in the specification as an aid to ex
Slidable tubular member I5 is provided at its
plain the operation of the device;
right end with a pair of diametrically opposite
Figs. 6 and ’l are detail views of a segmental
pins I3, see Fig. 2, which protrude through elon
blade forming part of the muzzle closing assem
55 gated slots 23 provided in the stationary tubular
blagc;
2,409,637
4
d
member 25. A tensile spring E53, one for each of
the two pins, is secured to the pin I3, the other
end being ancho-red to a small bracket 25a on the
stationary tubular member 25.
As clearly seen
in Fig. l, elongated slot 23 is wider than the thick
ness of pin I3, so that the tubular member I5, to
which the pins I3 are secured, as described, has
an extent of angular or rotational adjustment.
More particularly, tubular member I5 has two
positions of angular adjustment, one, in which the
teeth of the splined tube I 6, which is secured in
ternally to the tubular member i5, as described,
are aligned with the intermediate spaces of the
splined ring 5, which is secured externally to the
gun barrel i, as described, as shown in Fig. 4. -
The normal position of the tubular member i5,
i. e., with the muzzle-closer II) in closing position,
as in Fig. l, is diagrammatically shown in Fig.
5a.
The tubular member I5 is in forward or
muzzle-ward position, to the left in the figures,
with its pin I3 at the left end of slot 23, as seen in
Fig. 5a; it is also in the angular position in which
the teeth of the splined ring I5 abut the teeth of
the splined tube iii. In this position, teeth ß act
as stops preventing the rearward movement of
the tubular member i6, thus maintaining the
muzzle-closer i@ in closing position. In this po
sition of the parts, see Fig. 5a, the pin I3 is dis
posed at the upper, as viewed in Figs. 5u and l,
edge of slot 2S, and is maintained in this position
by means oi’ a V-notched ñnger 2S pivotally
mounted on the stationary tubular member 25 at
ZOU.. As best shown in Fig. l, the crotch of the
V-notch is positioned at or near the upper edge
of slot 23 to maintain pin i3 at that edge. The
V-iinger 2S has a short arm ZI to which is artic
shown by arrow a, Fig. 4, or rather by the said
operation of finger lever 2S, spline teeth I6 are
moved out of abutting alignment with the teeth
of the spline ring 6 associated with the gun bar
rel. The teeth It no longer being blocked by the
barrel teeth ii, the tubular member I5 is moved
rightwardly by tensioned spring 55s. This right
ward movement of tubular member I5 causes the
internal cam surface of the members IG to ride
over the gun barrel end forcing the muzzle de
vice IEì to be moved to open position, Fig. 3. The
pin I3 associated with the tubular member i5
therefore moves rightwardly towards the right end
of slot 2t to the position at its right end shown in
Fig. 5c. rI‘he right end of slot 23 is provided with
an inclined surface 2e, which is effective to move
the pin Iâ! upwardly if the pin were continued to
be moved rightwardly. However, at this time,
Fig. 5c, upward movement of pin i5, i. e.,
counterclockise turning of tubular member I5,
arrow b, Fig. e, is prevented by the teeth 6 of
the splined ring associated with the gun barrel.
The parts are thus left in the condition shown
in Fig, 5c, with the muzzel device I@ in open posi
tion.
The gun is now fired, the recoil causing the teeth
6 associated with the gun barrel to move righ*
wardly as shown in Fig. 503. The rightward move
ment of the gun barrel in recoil causes the teeth
â of the spline ring associated with the gun bar
rel to be moved rightwardly out of blocking en
gagernent with the teeth I6 of the spline ring as
sociated Iwith the tubular member, as shown in Y
Fig. 5d, with the result that pin I3 moves up the
. incline, as shown in Fig. 5e, the tubular member
i5 turning in 'a counterclcckwise direction, ar
row b Fig. 4. This turning of tubular member
I5 brings the teeth Iâ of the splined tube again
of which is located at the breech end of the gun,
in alignment with the teeth ä of the splined tube,
to the right in Figs. 1_3 and is slidably guided in
a sleeve
secured to the stationary tubular 40 as shown in Fig. 5e. Subsequently upon the
counter-recoil movement of the barrel, leit
member
Rod ää terminates in a knob 22.76
wardly in the figures, the teeth 8 of the splined
in close proximity to the breech elevating mech
anism designated generally as 3S. Between knob
ring associated with the gun barrel moves the
tubular member I5, ‘by moving its associated
22k and the right end of frame sleeve 2S is a com
pression spring 22s; which normally urges rod 22 i' spline teeth "It, to the left, as shown in 5f, thus
rightwardly, to maintain ñnger lever 2v2 turned
moving the muzzle device to closed condition,
with the tubular member I5 in its leftward po
in a counterclock'wise sense, with its V-notch
sition, Figure 2.
aligned with the upper edge of slot >23, as shown
Details of the muzzle-closing device Iíl are
in Fig. l.
shown in Fig. 8. The segment pieces Iii, pivoted
In the normal condition of the parts, as shown
on pins I2 of the annular head if?, as previously
in Fig. 5a, the spring £55 is under tension tend
explained and shown in Fig. 2, are connected to
ing to pull the pin i3 associated with the tubular
member i5 rightward but is blocked by the abut
one another by tensile springs IGS which are ef
fective when the muzzle closing device, i. e., seg
ment of the teeth It of the splined tube, like
wise associated with the tubular member I5, with ' ments Iîl, is moved, by movement of the said an
nular ring Iii of the tubular member I5, beyond
the teeth 6 of the ’splined ring associated with
the muzzle, as in Fig. 2, to draw the segments Iû
the gun barrel. In this normal position of pin
together to closed condition as shown in the said
I3 at the left of slot 23, Fig. 5a, the muzzle-closer
iigure. To avoid the possibility of ñring the gun
Ii! is maintained in closed position. To bring the
muzzle-closer §53 to its open position-prepara 60 when the muzzle device is in closed position,
tory to discharging the gun-_knob 22k is caused
which might occur upon the breaking of an op
to be moved. to the left, to move rod 22 in that
ative part or because of some other mishap, an
direction, causing finger Vlever 2i! to be turned
electrical switch 4D, Figs. l0 and 1l, is provid
clockwise and its V-notch to cam pin I3 toward
ed in the electrical circuit associated with the
the lower edge of slotl 23 as shown in Fig. 5b. VThe
nring mechanism> (not shown). Switch 4B has
knob 2tlg; is pushed leftwardly by the breech ele
a roller ¿il which clears through a hole Z8 pro
vating mechanism 39, Fig. 1, more particularly
vided in outer tubular member '25. When the
by a movable part thereof, such as the rod "5I
inner tubular member I5 is in its rightward po
shown in Figi. »1. As the breech block is elevat
sition, Fig. 11, at which time the muzzle device
ed (not shown) the compressed spring SIS asso
i's in open condition, the roller 4I is caused to
ciated with mechanism 3G causes rod SI to move
ride on the member I5, being thus moved up
leftwardly.
Y
wardly to close the switch di), i. e., to permit thev
In this position, Fig. 5b, of tubular member
gun to vbe discharged, inasmuch as the muzzle
I5, turned angularly by its pin I3, tubular mem
device is in open position. When however, the
ber I5 turns slightly in a clockwise direction, as
tubular member I5 moves to the left, to the po
ulated the left end of a long rod 22, the right end
2,409,637
5
sition shown in Fig. l0, the roller ¿il drops oir. the
tubular member and opens the switch d0, thus
opening the primer circuit, inasmuch as the
muzzledevice is now in closed condition.
I claim;
-
Y
l. In a muzzle closing device for a gun, in
combination, a tubular member slidably mounted
on the gun barrel and adapted to turn through
a limited angle, a member secured internally
to the said tubular member and itself internally
splined, Ya ring member s-tationarily secured to `
6
movement of the tubular slide member and with
the muzzle closing means maintained in closed
condition.
,
2. In a muzzle closing device for a gun, inv com
bination, a tubular member slidably mounted on
the gun barrel and adapted to turn through a
limited angle, the said member being internally
splined, a ring member stationarily -securedto
the gun barrel and externally splined, the teeth
of the said tubular slide member clearing through
the interdental spaces of the said stationary
spline ring in one angular position of the tubular
the gun barrel and externally splined, the teeth
slide member and blocked by the teeth. of the
of the said splined member clearing through the
stationary spline ring in a second' angular posi
interdental spaces of the said stationary spline
ring in one angular position of the tubular slide 15 tion of the tubular slide member, a second tubu
lar member stationarily secured to the gun breech
member and blocked by the teeth of the station-»_
and provided with an elongated slot having an
ary spline ring in a second angular position of
inclined cam surface at itsbreecheend, a pin
the «tubular slide member, a second tubular mem
externally projecting from the inst-mentioned
ber stationarily secured to the gun breech and
tubular slide member and received in f the
provided with an elongated slot having an in
elongated slot of the second-mentioned sta
clined cam surface at its breech-end, a pin eX
ternally projecting from the first-mentioned
tionary tubular member, the said slot being suffi
ciently wide to permit the pin to be vturned the
tubular slide member and , received in the
lelongated slot of the second-mentioned sta
said limited angle of tubular slide member turn«
tionary tubular member, the said slot being suiiî 25 ing and suñîciently long to permit the pin to be
ciently wide to permit the pin to be turned the
moved with the tubular slide member a distance
said limited angle of tubular slide member turn
somewhat greater than the length of the said
ing and sufñciently long to permit the pin to be
spline teeth of the tubular slide member, muzzle
moved with the tubular slide member a distance
closing means at the muzzle-end of the tubular
somewhat greater than the length of the said 30 slide member, a tensile spring secured to the
splined member of the tubular slide member,
said pin and anchored on the said stationary
muzzle closing means at the muzzle-end of the
tubular member tensioned to urge the tubular
tubular slide member, a tensile spring secured>
slide breech-ward to move the said muzzle closing
to the said pin and anchored on the said sta
means to open position, a forked lever pivotally
tionary tubular member tensioned to urge the 35 mounted at the muzzle-end of the elongated slot
tubular slide breech-ward to move the said
with the said pin of the tubular slide member
muzzle closing means to open position, a forked
received in its fork whereby the tubular slide
lever pivotally mounted at the muzzle-end of
member is normally maintained in its second
the elongated slot with the said pin of the
said angular position with its spline teeth blocked
tubular slide member received in its fork where 40 against breech-ward movement of the tubular
by the tubular slide member is normally main
slide member under urgency of the said spring
tained in its second vsaid angular position with its
by the spline teeth of the stationary spline ring,
spline teeth blocked against breech-ward move
means for turning the said forked lever to turn
ment of the tubular slide member under urgency _ the tubular slide member to its first said angular
of the said spring, by the spline teeth of the sta
position with its spline teeth clearing in the inter
tionary spline ring, means for turning the said
dental spaces of the stationary spline ring,
forked lever to turn the tubular slide member to
whereat the said tensile spring moves the tubu
' its first said angular position with its spline teeth
lar slide member breech-ward, the said muzzle
clearing in the interdental spaces of the station
closing means being moved to open position and
ary spline ring, whereat the said tensile spring
the said pin approaching the said cam surface
moves the tubular slide member breech-ward, the
end of the elongated slot, the spline teeth of the
said muzzle closing means being moved to open
tubular slide member being engaged by the spline
position and the said pin approaching the said
teeth of the said stationary spline ring to pre
cam surface end of the elongated slot, the spline
vent turning offthe tubular slide member, the
teeth of the tubular slide member being engaged
said spline teeth of the spline ring being moved
by the spline teeth of the said stationary spline
with the gun barrel on recoil breech-ward be
ring to prevent turning of the tubular slide mem
yond the spline teeth of the tubular slide mem
ber, the said spline teeth of the spline ring being
ber, the said pin of the tubular slide member
moved with the gun barrel on recoil breech-ward
riding on the said cam surface of the elongated
beyond the spline teeth of the tubular slide mem 00
slot whereby the tubular slide member is turned
ber', the said pin of the tubular slide member
to
the second said angular position with the
riding on the said cam surface of the elongated
teeth of the spline ring in blocking alignment
slot whereby the tubular slide member is turned
with the spline teeth of the tubular slide mem
to the second said angular . position with the
spline teeth in blocking alignment, the teeth of 65 ber, the teeth of the said spline ring engaging
the teeth of the tubular slide member upon
the said spline ring engaging the teeth of the
counter-recoil to move the tubular slide member
tubular slide member upon counter-recoil to
move the tubular slide member muzzle-ward, to
bring the said muzzle closing means to closed
position, the said pin of the tubular slide mem
ber engaging the said forked lever to maintain
the tubular slide member in the second said
angular position, with the tubular slide member
blocked by the abutment of its spline teeth with
theV teeth` oi the spline ring against breech-ward
muzzle-ward, to bring the said muzzle closing
means to closed position, the said pin of the
70 tubular slide member being received in the said
forked lever to maintain the tubular slide mem
ber in the second said angular position, with
the tubular slide member blocked by the abut
ment of its spline teeth with the teeth of the
75 spline ring against breech-ward movement of
’2,409,637
the tubular slide member'and with the muzzle
closing means maintained in closed condition.
3. In a muzzle closing device for a gun, in com
bination, a tubular members slibaly mounted on
the gun barrel and adapted to turn through a
limited angle', a member secured internally to the
said tubular member and itself internally splined,
a ring member stationarily secured to the gun
barrel and externally splined, the teeth of the said
splined member clearing through the interdental
spaces of the said stationary spline ring in one
angular position of the tubular slide member and
blocked by the teeth of the stationary spline ring
8
4. In a muzzle closing device for a gun, in com'
bination, a tubular member slidably mounted on
the gun barrel and adapted to turn through a
limited angle, the said member being internally
splined, a ring member stationarily secured to the
gun'barrel and externally splined, the teeth of
the said tubular slide member clearing through
theinterdentalspaces of the said stationary spline
ring in one angular position of the tubular slide
member and blocked by the teeth of the station
ary spline ring in a second angular position of the
tubular slide member, a second tubular member
stationarily secured to the gun breech and pro
vided with an elongated slot having an inclined
cam surface at its breech-end, a pin externally
in a second angular position of the tubular slide
member, a second tubular member stationarily
secured to the gun breech and provided with an
elongated slot having an inclined cam surface at
'member and received in the elongated slot of the
its breech-end, a pin externally projecting from
second-mentionedstationarytubular member, the
the first-mentioned tubular slidemember and re
said slot »being suiiiciently wide to permit the pin
to be turned the said limited angle of tubular
slide member turning and su?liciently long to per
mit the pin to be moved with the tubular slide
member a distance somewhat greater than the
length of the said spline teeth of the tubular slide
member, muzzle closing means at the muzzle-end
ceived in the elongated slot of the second-men
tioned stationary tubular member, the said slot
being suiiîciently'wide to permit the pin to be
turned the said limited angle of tubular slide
member turning and sufficiently long to permit
the pin to be moved with the tubular slide mem
ber a distance somewhat greater than the length
of the said splined member of the tubular slide
member, muzzle closing means at the muzzle-end
of the tubular slide member, a tensile spring se
cured to the said pin and anchored on the said
stationary tubular member tensioned to urge the
tubular slide breech-Ward to move the said
muzzle closing means to open position, a forked
projecting from the inst-mentioned tubular slide '
of the tubular slide member, a tensile spring se
cured to the said pin and anchored on the said
stationary tubular member tensioned to urge the
tubular slide breech-Ward to move the said muzzle
closing means to open position, a forked lever
pivotally mounted at the muzzle-end of the elon
gated slot with the said pin of the tubular Vslide
member received in its fork whereby the tubular
slide member is normally maintained in its sec
ond said angular position with its spline teeth
blocked against breech-Ward movement of the
tubular slide member under urgency of the said
lever pivotally mounted at the muzzle-end of the
elongated slot with the said pin of the tubular
slide member received in its fork whereby the
tubular slide member is normally maintained in
its second said angular position with its spline
spring by the spline teeth of the stationary spline
teeth blocked against breech-Ward movement of
ring, means for turning the said forked lever to
the tubular slide member under urgency of the 40 turn the tubular slide member to its nrst said an
said spring, by the spline teeth of the stationary
gular position with its spline teeth clearing in
spline ring, means for turning the said forked
the interdental spaces of the stationary spline
lever to turn the tubular slide member to its íirst
ring, Whereat the said tensile spring moves the
said angular position with its spline teeth clear
tubular slide member breech-Ward, the said
ing in the interdental spaces of the stationary 45 muzzle closing means being moved to- open posi
spline ring, whereat the said tensile spring moves
tion and the said pin approaching the said cam
the tubular slide member breech-ward, the said
surface end of the elongated slot, the spline teeth
muzzle closing means being moved to open posi
of the tubular slide member being engaged by the
tion and the said pin approaching `the said cam
spline teeth of the said stationary spline ring to
surface end of the elongated slot, the spline teeth
prevent turning of the tubular slide member, the
of the tubular slide member being engaged by the
said spline teeth of the spline ring being moved
spline teeth of the said stationary spline ring to
with the gun barrel on recoil breech-Ward beyond
prevent turning of the tubular slide member, the
the spline teeth of the tubular slide member, the
said spline teeth of the spline ring being moved
said pin of the tubular slide member riding on
with the gun barrel on recoil breech-Ward be
the said cam surface of the elongated slot where
yond the spline teeth of the tubular slide mem
by the tubular slide member is turned to the sec
ber, the said pin of the tubular slide member rid
ond said angular position with the teeth of the
ing on the said cam surface of the elongated slot
spline ring in blocking alignment with the spline
whereby the tubular slide member is turned to the
teeth of the tubular slide member, the teeth of
second said angular position with the spline teeth GG the said spline ring engaging the teeth of the tu
in blocking alignment, the teeth of the said spline
bular slide member upon counter-recoil to move
ring engaging the teeth of the tubular slide mem
the tubular slide member muzzle-Ward, to bring
ber upon counter-recoil to move the tubular slide
the said muzzle closing means to closed position,
member muzzle-Ward, to bring the said muzzle
the said pin of the tubular slide member being
closing means to closed position, the said p-in oi
received in the said forked lever to maintain the
the tubular slide member engaging the said fork
tubular slide member in the second said angular
ed lever to maintain the tubular slide
position, with the tubular slide member blocked.
member in the second said angular position, with
by the abutment of its spline teeth with the teeth
the tubular slide member blocked by the abut
of the spline ring against breech-Ward movement
ment of its spline teeth with the teeth of the
of the tubular slide member and with the muzzle
spline ring against breech-ward movement of the
closing means maintained in closed condition,
tubular slide member and with the muzzle clos
and’means operated by the breech block mecha
ing means maintained in closed condition, and
nism of the gun for turning the said forked lever.
means operated by the breech block mechanism
5. In a muzzle closing device for a gun, in com
of the gun for turning the said forked lever.
75 bination, a tubular member slidably mounted on
2,409,637'A
9
10
member and blocked by the teeth of the station
ary spline ring in a second angular position `of
the gun barrel and adapted to turn through a lim
ited angle, the said member being internally
the tubular slide member, a second tubular mem
splined, a ring member stationarily secured to the
gun barrel and externally splined, the teeth of the
said tubular slide member clearing through the
interdental spaces of the said stationary spline
ring in one angular position of the tubular slide..
member and blocked by the teeth of the sta
tionary spline ring in a second angular position
ber stationarily secured to the gun breech and
provided with an elongated slot having an in
elined cam surface at its breech-end, a pin ex
ternally projecting from the first-mentioned
tubular slide member and received in the elon
gated slot of the second-mentioned stationary
of the tubular slide member, a second tubular 10 tubular member, the lsaid slot> being suiiiciently
Wide to permit the pin to be turned the said lim
member stationarily secured to the gun breech
ited angle of tubular slide member turning and
and provided with an elongated slot having an
inclined cam surface at its breech-end, a pin ex
sufficiently long to permit the pin to be moved
ternally projecting from the iirst-mentioned
with the tubular slide member a distance some
tubular slide member and received in the elon
15 what greater than the length of the said spline
gated slot of the second-mentioned stationary
tubular member, the said slot being sufliciently
wide to permit the pin to be turned the said lim
ited angle of tubular slide member turning and
sufficiently long to permit the pin to be moved 20
with the tubular slide member a distance some
what greater than the length of the said spline
teeth of the tubular slide member, muzzle closing
means at the muzzle-end of the tubular slide
member, a tensile spring secured to the said pin
and anchored on the said stationary tubular
member tensioned to urge the tubular slide
breech-ward to move the said muzzle closing
means to open position, means engaging the said
teeth of the tubular slide member, muzzle closing
means at the muzzle-end of the tubularslide
member, a tensile spring secured to the said _pin
and `anchored on the said stationary tubular
member tensioned to urge the tubular slide
breech-Ward to move the said muzzle closing
means to open position, means engaging the said
pin for normally maintaining the said tubular
slide member in its second said angular position
with its spline teeth blocked by the spline teeth
of the stationary spline ring, means for operating
the said pin engaging means to turn the tubular
slide member to its first said angular position with
its spline teeth clearing in the interdental spaces
pin for normally maintaining the said tubular 30 of the stationary spline ring, whereat the said
tensile spring moves the tubular slide member
slide member in its second said angular position
breech-ward, the said muzzle closing means being
with its spline teeth blocked by the spline teeth
moved to open position and the said pin ap
of the stationary spline ring, means for operating
proaching the said cam surface end of the elon
the said pin engaging means to turn the tubular
gated slot, the spline teeth of the tubular slide
slide member to its ñrst said angular position
member being engaged by the spline teeth of the
with its spline teeth clearing in the interdental
said stationary spline ring to prevent turning of
spaces of the stationary spline ring, Whereat the
the tubular slide member, the said spline teeth of
said tensile spring movesthe tubular slide mem
the spline ring being moved with the gun barrel
ber breech-Ward, the said muzzle closing means
being moved to open position and the said pin 40 on recoil breech-Ward beyond the spline teeth
of the tubular slide member, the said `pin of the
approaching the said cam surface end ofthe> elontubular slide member riding on the- said cam sur
gated slot, the spline teeth of the tubular slide
face of the elongated slot whereby the tubular
member being engaged by the spline teeth of
slide member is turned to the second said angu
the said stationary spline ring to prevent turning
lar position. with the teeth of the spline ring in
of the tubular slide member, the said spline teeth
blocking alignment with the spline teeth of the
of the spline ring being moved with the gun barrel
tubular slide member, the teeth of the said _spline
on recoil breech-ward beyond the spline teeth of
ring engaging the teeth of the tubular slide
the tubular slide member, the said pin of the tubu
member upon counter-recoil to move the tubular
lar slide member riding on the said cam surface of
the elongated slot whereby the tubular slide mem 50 slide member muzzle-Ward, to bring the said
muzzle closing means to closed position, the said
ber is turned to the second said angular position
pin of the tubular slide member being received in
with the teeth of the spline ring in blocking align
the said pin engaging means to maintain the
ment with the spline teeth of the tubular slide
tubular slide member in the second said angular
member, the teeth of the said spline ring engaging
the teeth of the tubular slide member upon coun 55 position, with the tubular slide member blocked
by the abutment of its spline teeth with the teeth
ter-recoil to move the tubular slide member muz
of the spline ring against breech-ward movement
zleeWard, to bring the said muzzle closing means
of the tubular slide member and with the muzzle
to closed position, the said pin of the tubular slide
closing means maintained in closed condition,
_iember being received in the said pin engaging
means to maintain the tubular slide member in 60 and means operated by the breech block mecha
nism of the gun for actuating the said pin en
the second said angular position, with the tubu
lar slide member blocked by the abutment of its
gaging means.
spline teeth with the teeth of the spline ring
against breech-ward movement of the tubular
slide member and with the muzzle closing means
maintained in closed condition.
6. 1n a muzzle closing device for a gun, in com
'7. -In a muzzle closing device for a gun, a gun
barrel, a member reciprocal relative to the
barrel. a muzzle closing assembly comprising a
plurality of complementary foldable sections piv
otally mounted on and adjacent the outer end
of said member in position to fold over the gun
bination, a tubular member slidably mounted
muzzle in the forward position of said member,
on the gun barrel and adapted to turn through
a limited angle, the said member being internally 70 barrel engaging portions on said foldable sections
adapted to engage the end of and slide along said
splined,
ring member stationarily secured to
barrel means included in the assembly so con
the gun barrel and externally splined, the teeth
structed and arranged to bias said sections and
of the said tubular slide member clearing through
the barrel engaging portions toward each other
the interdental spaces of the said stationary spline
ring in one angular position or" the tubular slide 75 and the gun barrel, and means for reciprocating
2,409,637
11
12 l
said member and said foldable sections as an en
sition, and means operable to disengage both
tirety relative to said barrel whereby upon rear
locking means whereby said member can move
said sections to a muzzle uncovering position.
ward movement of said member and foldable sec
tions relative to the barrel, the barrel engaging
portions will be cammed over the end of and
along the barrel to unfold said sections against
said biasing means.
8. In a muzzle closing device for a gun having
a ñxed part, in combination, a gun barrel, a mem
ber reciprocable on the barrel, a plurality of com
plementary spring-biased sections hinged to said
member and having barrel engaging portions
constructed and arranged to slide over the barrel
l0. In a muzzle closing device for a gun Whose
barrel moves in recoil and counterrecoil, in com
bination, a gun barrel, a stationary tubular mem
rber around the barrel and spaced therefrom and
having an elongated slot having a cam surface
therein, a tubular member surrounding the barrel
and also spaced therefrom and reciprocable with
respect to said stationary member, springs con
necting the two members and urging the recip
rocable member toward the stationary member, a
with said member, said sections being shaped to
muzzle closing assembly carried by the recip
fold over and close the gun muzzlelwhen the re
rocable member and comprising a plurality of
complementary spring-biased sections con
structed and arranged to fold together when the
reciprocable member reaches its forward position
ciprocable member is in its forward position,
spring means connecting said member to the fixed
part of the gun and urging said member to a rear
ward position wherein said sections uncover theL
muzzle, means for locking said member` in for- -
Ward position, and means for unlocking said
member and surrendering it to said spring means
connecting said member to said fixed part where
by said member is moved to bring the sections to
muzzle uncovering position.
9. In a muzzle closing device for a gun whose
barrel moves in recoil and counterrecoil, in com
bination, a gun barrel, a member reciprocably
mounted on said barrel, a muzzle closing assem
bly comprising a plurality of complementary
spring biased sections rockably mounted on said
member and having barrel engaging portions, said
sections being constructed and arranged to fold
over and close the barrel muzzle when said mem
ber is in its forward normal position, springs nor- g
to close the muzzle of the gun, a grooved tube se
cured to the inner Wall of the reciprocable mem
ber, a splined ring secured to the gun barrel and
cooperating with said grooved tube to lock the
reciprocable member against longitudinal move
ment with respect to the gun barrel and stationary member, a pin carried by the grooved tube
and extending through the slot in said stationary
member, a rockable lever on _the stationary mem
ber normally engaging the pin to hold the grooved
tube in locking relation to the splined ring, and
means operable to rock the lever to partially ro
tate said grooved tube in one direction to bring
the grooves therein into registry with the splines
on said splined ring whereby said reciprocable
member will be moved to the rear relatively to the
stationary member and gun barrel by said con
mally urging said member rearwardly on the gun
necting spring, said pin being constructed and
barrel to bring said section barrel engaging por
arranged to engage the cam surface in said slot
tions into engagement with the end of the barrel
substantially at the end of the rearward move
to unfold said sections upon the rearward move
ment of the reciprocable member to rotate said
ment of said reciprocable member, locking means 40 tube- relative to said splined ring in a reverse di
carried by said member, locking mea-ns carried by
rection to move said splines and grooves out of
the gun barrel cooperating with said member lock
registry.
ing means to look said member in a forward po
VICTOR F. LUCHT.
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