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Патент USA US2406461

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Aug. 27, 1946.
K. M. HAMMELL
'
2,406,461
MACHINE GUN RECHARGER
Filed Dec. 18, 1943
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BY
Aug. 27,1946.
K, M, HAMMELL
2,406,461
MACHINE GUN RECHARGER
Filed Dec. 18, 1943'
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2 Sheets—$heet 2
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Patented Aug. 27, 1946
STATES PATENT OFFICIE
2,406,461
MACHINE ‘GUN RECHARGER
Kemper M. Hammell, Detroit, Mich, assignor to
Eureka Williams Corporation, a corporation of 7
Michigan
Application December 18, 1943, Serial No. 514,849
13 Claims. (Cl. 89--1)
1
This invention relates to machine gun re
chargers and particularly to an automatic mech
anism for automatically recharging a machine
gun in the event that the bolt thereof fails to
retract.
Principal objects of the invention are:
To provide an automatic machine gun re
charger;
To provide a‘ new and improved form of auto
matic machine gun recharger;
To provide a lightweight, efficient, simple and
dependable machine gun recharger adapted to
be applied to a machine gun on a plane for auto
matically retracting-the bolt thereof when a dead
shell is in the breech of the gun barrel; and
To provide an electrical control circuit fora
machine gun recharger adapted to be attached
to a machine gun which is operated under the
control of an electric circuit.
Other objects and advantages of the inven
tion will be apparent from a consideration of the
following speci?cation taken in conjunction with
2
A-device embodying the invention consists of
a mechanism for automatically retracting the
bolt it against the tension of the spring (not
shown) thereof if the shell fails to ?re, and this
mechanism in general comprises a frame i5
adapted to be suitably secured to a machine gun
Ill as illustrated in Figs. 1 and 2, said frame form
ing a support for an electric motor [8, a reduc
tion gear 2%], a plurality of sprockets 22, 24, and
10 26, a chain '28 operatively associated with the
sprockets, a lug 35 on the chain 28, and a switch
box 32. In addition to the mechanism disclosed
in Fig. 1, a circuit such as that illustrated in Figs.
4 ‘or 5 is employed in connection therewith, and
such circuits include certain control mechanism
which may be mounted in a box or on a panel
elsewhere than on the recharger itself.
The sprocket 22 is mounted on a shaft 35
which projects from the reduction gear 23. The
20 reduction gear 20 may comprise a suitable hous
ing having gearing therein connected to the shaft
of the motor i8 and driven thereby, the gearing
functioning to drive the shaft 34 at a speed much
less than that of the motor during the operation
Fig. 1 is a side elevational view of a device em 25 thereof. The teeth of the sprocket 22 operatively
engage the links of the endless chain 28 for driv
bodying the invention, with certain parts thereof
ing the same, the sprockets Ed and ‘26 support
broken away;
the accompanying drawings, of which there are
two sheets and wherein:
Fig. 2 is a sectional vi w taken generally along
ingthe chain so that it has a path of movement
the line 2——2 of Fig. 1, looking in the direction
parallel to the path of movement of the bolt iii.
The lug 30 is carried by the chain and has a
of the arrows;
Fig. 3 is an enlarged view of the switch box
and assembly;
Fig. 4 is a diagrammatic illustration of one
shoulder 36 which when the chain is driven in
the direction indicated by the arrow 98 is
adapted to move through a path so as to engage
the bolt 62 at the right hand end of slot M and
form of circuit for the recharger; and
Fig. 5 is a diagrammatic illustration of another 35 move it to the left for the purpose of retracting
the same against the spring which is conven
form of circuit for the recharger.
tionally associated therewith.
Referring now ‘to Fig. 1, there is indicated a
The lug 39 at one end thereof is pivoted at 38
portion of a machine gun I0 having a bolt l2
to the chain, and at the other end thereof has a
which is adapted to reciprocate during the oper
ation of the gun. The bolt I2 is associated with 40 pin and slot connection M] with the chain so as
to not interfere with the passage of the chain
the ?ring mechanism of the gun and is retracted
over the sprockets. When the 111;; 33 has moved
by the recoil due to the ?ring of the shell. While
the bolt i2 to its leftmost or retracted position
these machine guns generally are not operated
for more than a few seconds at a time, there are
(approximately the lefthand end of the slot Ill)
some which will ?re as many as seven hundred 45 the path of the lug 3i“: veers away from the path‘
rounds of ammunition per minute, which means
that the bolt 52 may reciprocate as frequently
as approximately twelve times per second. The
of the bolt [2 so as to disengage the lug 30 from
the bolt 12, thereby permitting the spring asso
ciated with the bolt to return it in order to ?re
the shell in the breech of the gun.
bolt !2 is indicated in the general position to be
The frame It may be suitably formed of sheet
released upon closing of the ?ring circuit for ?r 50
metal and have suitable brackets by means of
ing the shell which is positioned in the breech
which the reduction gear 29, the motor l8 and
of the gun barrel and after ?ring of such shell
switch box 32 may be assembled to the frame l6
the recoil will move the bolt I2 to the left along
itO form a unit, and the unit may be assembled
the path indicated by the slot 14 of the gun
55 tothe machine gun Iii in the relative position in
through which the bolt i2 projects.
:
2,406,461
3
dicated. Cover or guard 511 may be removably
secured to the frame l6 so as to at least partially
enclose the operating mechanism of the unit.
The sprockets 24 and 26 are each individually
journaled on a bearing 58 which is carried by an U!
eccentric sleeve 58 which in turn is carried by
screw 6!] which in turn is threaded into nut 62
carried by the frame it. Thus the sprockets‘24
4
amount in its driven direction, which is indicated
by the arrow 98, the pin 96 will engage the arm
9i] and shift the member 86 to its other position
so as to close the switch 66.
The chain 28 is provided with another laterally
extending pin H33 which projects from one of the
links of the chain in a direction away from the
gun and which pin 569 is adapted to engage the
arm 88 and return the member 85 to the position
and 26 may each be adjusted vertically or hori
zontally and independently of each other so as 10 illustrated in Fig. 1 so as to open the switch 68.
to properly position the chain 28 and tension the
Thus, after the chain 23 and lug 39 have been
same.
.
moved a small amount from their starting posi
The switch box 32 has arranged therein a
tion in which they are indicated in Fig. 1, the
pin 96 will by acting on the switch arm 90 close
double contact switch 64 whichrwill hereinafter
sometimes be referred to as a bolt-operated 15' the chain-operated switch 86, and shortly before
the chain 28 and lug 38 are returned to their
switch, and another switch 68 which will herein
starting position the pin Hit will engage the
after sometimes be referred to as a chain-oper
ated switch. The bolt-operated switch 64 in
switch arm 88 and open the switch 66. After the
switch 66 is open the inertia of the motor [8 and
cludes stationary contacts 88 and movable con- '
gearing 251 will permit the lug 31‘! to return ap
tacts ‘ill, the contacts 18 being carried by a mem
ber which is mounted on a pin or plunger 12.
Plunger 12 is reciprocally mounted in the switch
box 32 and the righthand end thereof, as illus
trated in Fig. 1, is positioned so as to be engaged
by the bolt l2 at the end of each retractile stroke
thereof. A spring ‘M arranged around one end of
the plunger 12 and con?ned between one wall of
the case 32 and the movable contacts ‘IE1 biases
the same out of engagement with‘ the stationary
contacts 68 so that the bolt switch 94 is normally 30
open.
proximately to the position illustrated.
The bolt-operated switch (it is adapted to be
closed during the operation of the machine gun
by the reciprocation of the bolt l2, and the clos
ing of the switch 64 controls the motor circuit
so as to prevent the operation thereof while the
machine gun is operating, if the trigger and
safety switches thereof are closed as will be fur
ther described hereafter. However, should the
machine gun fail to operate with the trigger
switch and safety switch closed, the bolt i2 will
not reciprocate and the switch 64 will remain
open, thereby controlling the circuit of the motor
The stationary contacts 68 preferably are re
siliently mounted. A spring 76 may be arranged
so as to initiate the operation thereof. When
between the member which carries the movable
the motor operates, the chain 28 will be driven
contacts ‘Hi and a nut ‘F8 secured to the plunger
in the direction indicated by the arrow 98 and
which cooperates with bracket 80 so as to limit
after a relatively small movement of the chain
the movement of the plunger 12 to the right.
the switch 66 will be closed. The switch 66 con
The plunger 72 extends through a suitable hole
trols the motor circuit so as to keep the same
in bracket 8!]. The member which carries the
movable contacts 19 is not fastened on the 40 closed after the motor begins to operate and
until the recharger mechanism completes one
plunger 12 but is positioned thereon by the
cycle of operation.‘
springs 11% and 15. When the bolt l2 strikes the
One cycle of operation consists of movement
end of the plunger 12 and thereby moves the
of the chain 23 su?iciently so as to move the lug
same to the left, the switch 64 will be closed for
30 from the position in which it is illustrated in
a fraction of a second. The actual time interval
Fig. 1 around past the sprockets 26, 24 and 22
that the switch 64 is closed will to some extent
and back to the position illustrated. During this
depend upon the speed of ?ring of the machine
movement the lug 30 will, as previously de
gun. Under some circumstances it may be desir
scribed, retract the bolt l2 and free it for move
able to provide some means to retard slightly the
opening movement of the switch 64.
50 ment under in?uence of its spring. The switch
66 closes the motor circuit shortly after the mo
Switch 66 includes movable contact 82 and sta
tor begins to operate and will keep the motor cir
tionary contact 84. This switch is normally open
cuit closed until opened by the pin I00, even
and is adapted to be closed and opened by the
though the trigger and/or safety switch of the
chain during each cycle of movement. Movable
machine gun circuit are opened before the
contact 82 is carried by a switch-operating mem
mechanism completes one cycle of operation.
ber 85 having arms 88 and 9B. The member 86
The wires of the motor circuit are connected
in cross section is U-shaped, and the arm 88 is
to the switches in the switch box 32, and the
positioned at one side of the chain 28 while the
switches in the switch box 32 are adapted to be
other arm 99 is positioned on the opposite side
vof the chain 28. The member 86 is pivoted at 92 60 connected by suitable current conductors to the
controls, the connector Ill] being provided on
and is held in either its open or closed position
the switch box 32 for cooperation with a suitable
by a spring 913, one end of which bears against the
connector on the current conductors which lead
end of the member 86. For example, in the
to the controls.
position illustrated, the end of the spring 94 bears
against the member 86 to one side of the pivot 92, 65
The switches and controls and circuits are
thereby holding the same in its open position.
diagrammatically illustrated in Fig. 4 wherein
When the switch is closed the member 86 pivots
the same reference'characters have been em
in a counterclockwise direction, thereby shifting
ployed to indicate the switches as described in
the end of the spring 94 to the other side of the
connection with Fig. 1. Conductor A is con
pivot 92 for holding the switch 66 closed. The 70 nected by the master gun or safety switch HI of
switch arm 90 is, in the position in which it is
the ?ring circuit for the machine gun to a suit
illustrated, arranged in the path of a pin 96 which
able source of current, and when such switch is
projects laterally from one of the links of the
closed the conductor A is energized. This con
chain. The pin 96 projects toward the machine
ductor A is connected to one side of the motor
gun and after the chain has moved a limited 75 l8 and a conductor B leads from the other side
2,406,461
5
6
of the motor ‘I8 to contact 84 of switch 66. This
conductor B is adapted to be grounded by the
shell in the breech of the ‘machine gun is usually
switch 86 when the same is closed so as to close
ciprocate.
the cause for the failure of the bolt I2 to re
The switch 66 will be closed as previously de
the circuit through the motor. The conductor
B is also connected to one of the stationary con Ci scribed shortly after the motor begins operating
and will remain closed until shortly before the
tacts of a double contact relay switch H4. The
lug 38 completes one cycle of operation. Thus if
other stationary contact of switch H4 is
the trigger switch is opened, which would deen
grounded. The movable contact or armature
ergize the conductor 0, the motor circuit would
H6 of relay switch H4 is positioned so that the
be closed from conductor A through the switch
switch H4 is normally closed when the safety
66, and in this way the recharger mechanism will
switch III is open. Whenever the conductor B
complete a cycle, once started, irrespective of
is grounded, either through switch 66 or through
whether or not the trigger switch is open during
switch H4, the motor will operate. The con
ductor A is connected to one end of the coil H8
of the relay of switch H4, while the "other end of V
such coil is connected by conductor C to the ?r
ing circuit D which includes the ?ring solenoid
H5. A 28-volt, l3-watt lamp I23 is arranged in
a cycle, so that the next time that the trigger
switch is closed the machine gun will be cooked
for immediate ?ring.
Thus one form of my invention comprises a re
charger for an electrically operated machine gun
I0 adapted to be ?red by the closing of a ?ring
series with relay coil H8 and between the same
circuit D, said circuit including a master switch
and conductor C.
III, a ?ring switch H-3 and a ?ring solenoid H5,
As the switch H4 is closed when the safety
said ?ring switch being in series with said master
switch I I I is open, the circuit through the motor
switch and operable upon closing, when said mas
I8 will be closed upon closing of the switch III,
ter switch Hi is closed, to energize said ?ring
but as the coil of relay switch H4 is arranged in
solenoid H5, thereby to initiate the normal op
parallel with the motor I8 and grounded through
eration of the machine gun (assuming that the
the ?ring circuit D and solenoid H5, the relay
gun is loaded and provided with means such as
will act immediately to open switch H4. While
a cartridge belt for supplying live ammunition
the circuit through the motor I8 is closed mo
thereto), said gun having a reciprocable bolt I2
mentarily, such circuit is not closed for a suffi
cient length of time to enable the motor to do 30 adapted to be retracted normally by the ‘recoil
of a ?red shell, said recharger comprising a mem
any more than turn through several degrees of
ber 38 movable through a path and in its move
movement. The coil H8 of the relay preferably
ment through said path being engageable with
has a voltage rating of 41/2 volts, much less than
said bolt I2 for retracting the same and being
the rating of the motor circuit which may be
adapted to release said bolt in its retracted po
18-28 volts, so that the relay H8 will be excited
sition, an electric motor I8, a driving connection
quickly in order to open the switch H4 very
between said motor and member 38 for moving
quickly after the safety switch I I I is closed. The
the latter through its path during operation of
resistance of the lamp I28 when the same is cold
said motor, a motor circuit A, B having its high
is comparatively low, but this resistance increases
rapidly and considerably when the lamp is 40 potential end connected to said ?ring circuit D
between said switches, a time delay relay in
lighted, thereby protecting the relay H8 from
cluding a switch H4 associated with the ground
overload.
ed end B of the motor circuit and operable to
When the trigger switch IE3 is closed the ma
open the motor circuit upon closing of said mas
chine gun ?ring circuit D will be closed, thereby
actuating the solenoid H5 to release the ?ring 45 ter switch III, one end of the relay coil H8
being connected to the high potential end A of
pin thereby initiating the operation of the mathe motor circuit, the other terminal of the relay
chine gun. When the trigger switch I I3 is closed,
coil I I8 being arranged, upon closing Of said mas
both ends of the relay coil H3 will be connected
ter switch III, to be grounded through a lamp
through conductors C and A to ‘the positive side
of the circuit, thereby tending to neutralize or 60 bulb I28 in series with said ?ring solenoid H5,
when said ?ring switch H3 is open, for operat
deenergize the coil I I8. However, as soon as the
ing said relay switch H4 to open said motor cir
?ring solenoid H5 is actuated, the gun begins
cuit, said other terminal of said relay coil H8
?ring and the bolt I2 thereof will engage the
also being arranged to be grounded through a
movable contact of switch 54 and close the same
momentarily, thereby grounding the coil H8 and 55 bolt-operated switch ‘64, periodically momentarily
closed by and during the reciprocation of said
conductor C through conductor E and switch 64.
bolt I2, (during normal operation of said gun)
The relay switch H4 is of the delay type and is
when the ?ring switch H3 is closed, for energiz
adapted to be energized rapidly relative to its
ing said relay coil H8 su?'iciently to keep said
time of deenergization. A timing slug I I1 is pro
Vicled on relay H8 to delay the drop out thereof. 60 switch I I4 from closing, thereby to keep said mo
tor circuit AB open, a mechanically operated
That is, during the time that the bolt-operated
switch 66 adapted to be closed by the cycling of
switch 54 is closed, which may be for .005-.010
said member 30 and arranged upon closing to
second per cycle, the relay coil H8 must be ex
ground said motor circuit AB, the voltage rating
cited su?lciently in order to hold switch I I4 open
until the next cycle of excitation, and the char 65 of said relay coil H8 being materially less than
that carried by said motor circuit AB and the
acteristics of the relay coil H8 must be such
initial resistance of said lamp bulb I28 being Sui
that approximately 1/; of a second must elapse
?ciently low so that upon closing of said master
after the circuit through the relay is opened be
switch III, the relay coil H8 will be energized
fore the armature HE is released. Because of
at 'a su?iciently rapid rate so that the relay switch
this the switch H4 will remain open during the
H4 will open the motor circuit before the motor
reciprocation of the bolt I2. As soon as such re
makes an appreciable starting e?ort, the char
ciprocation stops the relay coil I I8 will become de
acteristics of the lamp bulb I28 being such that
energized and permit the closing of switch H4,
upon lighting, the resistance thereof increases
thereby closing the circuit through the motor I8
and initiating the operation thereof. A defective 75 thereby limiting the current ‘in the relay coil
.2',406,461
"7
H8 to a safe value, the closing of said ?ring
6'4, periodically momentarily closed by and 'dur
switch I I3 functioning to energize the ?ring sole
ing the'reciprocation of bolt I2, (during normal
noid H5 and to deenergize said relay- coi1.II8
operation of the machine gun) or through seri
and lamp bulb I 20, the operation of said machine
ally arranged switches I40 and I42. Switches I30
gun and reciprocation of the, bolt I2 thereof pur
and I40 are simultaneously opened by energize.
suant to the energization of solenoid I I5 function
tion of coil I33 and circuit I32, which occurs
ing to periodically close said bolt-operated switch
(starting with the. circuits arranged as illustrated)
64 sufficiently frequently to maintain said coil
immediately upon energization of the motor cir
IE8 energized sufficiently to maintain said relay
cuit FG due to the closing of master switch III.
switch II 4 open, said time delay relay being 10 Thus the low impedance circuit I32 is energized
constructed to allow a rapid opening of the relay
only momentarily. Normal impedance circuit
switch. I I4 and a relatively slow closing thereof,
I34, arranged in parallel with circuit I32, is en
the period of the closing time of said relay being
ergized simultaneously therewith being grounded
appreciably greater than the period of opera
through switch I 4-4, the energization of coil I38
tion of the machine gun, the coil II8 of the relay 15 functioning to keep switches I33'and I40 open
being wound so as to have a‘su?iciently low im
pedance that a su?iciently high excitation will
be produced in the coil upon the periodic momen
tary closing of the bolt operated switch, failure
after. the low impedance circuit is opened.- . As
thus arranged the circuits are in what might be
termed “stand by” position. A switch I 46 also
forms a part of the time delay-.relay-and is ar
of said gun to operate when said ?ring switch is 20 ranged so as to close before .switches I30 and
I40 open.
closed deenergizing the coil H8 of said relay and
permitting said switch M4 to close said motor
Closing of ?ring switch. H3 will, as hereinbe
circuit thereby initiating a cycle of operation of
fore indicated, energize the ?ring circuit D and
said recharger to effect the. retraction of said
.?ring solenoid I I5, thereby initiating operation of
gun bolt, said mechanically operated switch being
the machine gun. If live ammunition is in the
closed by the cycling of said memebr 30, to keep
gun, the gun will operate thereby causing recip
said motor circuit closed until said recharger com
rocation of bolt I2, which in turn will periodically
pletes said cycle of operation, said member being
momentarily close switch 54. The closing of the
operable during said cycle of recharger operation
?ring circuit D will also energize the circuit Kin
to retract said bolt and free the same, in order 30 which switch I46 (now closed) is arranged, circuit
to restart the operation of said machine gun if
K having its high potential side connected to the
said ?ring switch H3 and motor switch III are
?ring circuit D and being grounded through pull
closed, restarting of the operation ofsaid-machine
in coil I48 (100.chms) of. a-control relay means
gun causing the bolt I2 thereof to close said bolt
operated switch 64 to ground said relay coil H8
in order to keep open said motor circuit after
said recharger has completed one cycle of oper
ation.
,
.
In the modi?ed form of the invention using the
circuits illustrated in Fig. 5, in lieu of that illus
trated in Fig. 4, the machine gun is adapted to
be ?red by the closing of ?ring circuit D, said cir
cuit including master switch III, ?ring switch
I I3 and ?ring solenoid I I5, said ?ring or trigger
switch being in series with said master switch
and operable upon closing, when said master
switch III is closed, to energize ?ring solenoid
H5, thereby to initiate normal operation of the
machine gun (assumingthat the'gun is loaded
and provided with means such as a cartridge belt
for supplying live ammunition thereto) and re
ciprocation of the bolt I2 thereof.
,
I
.
>
The motor I8 is operatively arranged in a mo
tor circuit FG having its high potential end con
nected to the ?ring circuit D between switches III and H3. . Certain parts of these circuits du
plicate parts of the circuits illustrated in Fig, 4
and in such cases the same reference characters
as used in Fig. 4 have been employed in Fig. 5
to designate corresponding parts. The motor cir
cuit is adapted to be grounded through relay
switch £30 or through the mechanically operated
switch 66, which as previously indicated is nor
mally open, but closed during cycling of the re
charger. Relay switch I30 forms par-t of a time
delay relay means which includes a low imped
ance circuit I32 and a normal impedance circuit
I34 connected in parallelto the high potential
side of the motor circuit. Low impedance circuit
I32 includes a relay coil I36 (which may have a
resistance of 1.4 ohms) which is arranged in
series with coil I38 (which may have a resistance
of 200 ohms‘) of the normal impedance circuit
which further includes lock-in coil
I50 ' (240
ohms) and switches. I42 and I44. Energization
of coil I48 will open switches I42 and I44, thereby
opening the normal impedance circuit I34 and
deenergizing coil I38‘(low impedance circuit I32
previously having been'deenergized by ‘opening of
switch I40). The coil I43 operates to open
switches I42 and I44 before the bolt I2 closes
switch 64, but the coils I36 and I38 of the time
delay relay are ‘provided with a timing slug or
means I52 Which'holds open the switches I30 and
I4!) until the low impedance circuit is grounded
through the bolt-operated switch 64; that is, the
timing slug I52 delays the deenergization of coil
I33 for a period of time (a fraction of a second)
until the coil I36 is energized by the closing of
‘Switch 64. The coils I36 and I33 of the‘time
delay relay are constructed to allow a rapid open
ing of the relay switches I30 and I 40 and a rela
tively slow closing thereof, the period of the 010s
ing time of the relay ‘being appreciably greater
than the period of operation of the machine gun.
The grounding of the low impedance circuit I32
through the bolt-operated switch 64 functions
during normal operation of the machine gun to
keep the pull-in coil I36 energized su?iciently to
keep the switches I 30 and I40 open and the switch
I46 closed.
‘
So long as the ‘switches 63 and I30 are open, the
motor circuit FG will be open, and this condition
will’ prevail during normal operation of the ma
chine gun. If after closing of the trigger switch
I I3, the gun fails to start or stops, the bolt—oper
ated switch 64 will remain open, thereby deener
gizing the low impedance circuit I32, as a result
of which the coil I36 of the time delay relay will
become deenergized, thereby allowing switches
I33 and I40 to close and switch I46 to open. The
closing of switch I30 will close the motor circuit
FG, thereby initiating operation of the motor
I34. Lowimpedance circuit I32 is'ada'pted to
which, through the mechanism previously de
.be- grounded either through bolteoperat'ed switch 75 scribed, will retract the'bolt I2, as a consequence
2,406,461
10
of which a new piece of ammunition will be in
eration of such mechanism, restoring means elec
serted in the gun barrel for ?ring.
The switches of the time delay relay are set so
that the switches I30 and I40 will close before
motor driven member 30) to reestablish motion in
said mechanism when said cyclic rate is inter
trically operated and mechanically operable (the
switch I46 opens. The closing of switch I40 will U: rupted due to accidental cause, electrical dis
criminating means (the time delay relay and the
close the low impedance circuit I32 and ground
low impedance circuits) actuated at least once
the same through the lock-in coil I50. The re
per operating cycle of said mechanism and op
sulting energization of the lock-in coil I50 will
erable to initiate functioning of said restoring
function to keep the switches I42 and I 44 open
even though the coil I48 might become deener 10 means, interlocking means (lock-in coil I50,
switches I42 and 144, and the chain operated
gized due to the opening of the switch H3 or
switch 65) associated with said discriminating
switch I46. The lock-in coil I50 has a resistance
means and operable to cause the completion of
of about 240 ohms so that when the low imped
the cycle of the restoring means once the dis
ance circuit I32 is grounded through such coil
I50, the latter will draw practically all of the cur 15 criminating means has initiated operation there
of, and unlocking means (switch 54, coil I35
rent in the circuit, with the result that the coil I35
which operate when the bolt I2 is retracted by
will not be energized su?iciently to open the
the member 30 to cause the deenergization of
switches I30 and I40 or to close the switch I 45.
the lock-in coil I50 and the opening of switch
Between the switch E30 and the ground, a resist
I42) associated between said discriminating and
ance I 60 of one ohm is provided in order to reduce
interlocking means and operable to restore said
the load across the contacts of the switch I 30 dur
discriminating and interlocking means to a
ing the opening and closing thereof. When the
switch I30 closes, the operation of the motor will
be initiated to begin the cycling of the recharger,
stand-by condition.
If the coil I48 is provided with some time delay
but as hereinafter explained the motor will be op 25 action to delay the drop-out thereof, then it be
comes immaterial whether the switch I46 closes
erated under substantially no load until after the
before the switches I30 and I40. This time delay
chain-operated switch 55 closes, which occurs as
for the coil I48 may be obtained by utilizing a
soon as the chain 28 has moved sumciently to en
timing
slug, such for example, as the type em
gage and actuate the switch arm 90 by the pin 96.
ployed in connection with the coil I 38 as indi
Toward the end of the cycle of operation of the cated by the reference character I52.
recharger the pin I00 will, through engagement
While the invention has been described with
with the arm 88 of the switch 66, open the same
some
detail, it is to be understood that the de
after the recharger has been relieved of the load
scription is for the purpose of illustration only
of the bolt I2. The retraction of the bolt I2 by
and is not de?nitive of the limits of the inventive
the recharger will close the switch 54 before the
idea. The right is reserved to make such changes
switch 66 is opened as just described. Such clos
in the details of construction and arrangement
ing of the switch 54 will thereby close the circuit
of parts as will fall within the purview of the
through the low impedance coil I36, thereby en
ergizing the same to open the switches I30 and
attached claims.
I claim:
I40 and close the switch I46, such switch I46 clos- ‘
1. A recharger for an electrically controlled
ing before the switches I30 and I40 open. While
machine gun adapted to be ?red by the closing of
the lock-in coil I50 will be deenergized by the
a ?ring circuit, a trigger switch operable for clos
opening of switch I 40, the previous closing of
ing
said firing circuit, said machine gun having a
switch I46 will close the circuit K through the
reciprocable bolt adapted to be retracted normally
pull-in coil I48. As a result of the foregoing ac
by the recoil of a ?red shell, said recharger com
tions following the closing of the switch 64 by
prising a member movable through a cycle and in
the bolt I2 upon the retraction thereof by the re
its movement through said cycle being engage
charger, the circuits will be restored to their
able with said bolt for retracting the same and
stand-by position. If the new shell injected into
the gun barrel is a piece of live ammunition, the 50 being constructed and arranged to release said
bolt in its retracted position in order to restart
normal operation of the gun will be resumed with
the operation of said gun if said ?ring circuit is
the result that the bolt I2 will periodically mo
closed, an electric motor, a driving connection
mentarily close the switch 54. thereby closing the
between said motor and member for moving the
low impedance circuit I32 sufficiently frequently
latter through its cycle during operation of said
to keep the coil I 36 energized in order to keep the
motor, an electric circuit in which said motor is
switches I30 and I40 open and the switch I46
closed. It will be observed that the motor circuit
included, a relay including a switch in said motor
is closed through the switch 65 in order to permit
circuit and a coil, one side of said coil being con
the recharger to complete its cycle of operation
nected to the high potential side of said motor
and that the opening of ?ring switch I I3 during
circuit, said coil upon being energized function
a cycle will not interfere with the completion
ing to open said switch in said motor circuit, the
thereof. The opening of switch I46 will prevent
closing of said ?ring circuit by said trigger switch
an inductive reactance from the ?ring solenoid
functioning to initiate the operation of the ma
II5 from momentarily deenergizing the coil I48
chine gun and the reciprocation of said bolt,
of the control relay under certain conditions.
means operable upon the closing of said ?ring cir
While the circuits disclosed herein form a part
cuit to deenergize said coil, the drop out time of
of a recharger mechanism, I contemplate that
said relay coil being greater than the period of
such circuits may be employed in other types of
reciprocation of said bolt, and means including
cyclic mechanisms for restarting the operation 70 a circuit for said coil having a normally open
thereof. In its broadest aspect the invention dis
switch provided with an actuating member posi
closed and claimed herein comprises a mechanism
tioned in the path of said bolt and constructed
operable at a substantially constant cyclic rate
and arranged to be actuated thereby normally to
(the machine gun), electric means (the ?ring
close said switch momentarily and periodically
solenoid H5 and circuit therefor) to initiate op 75 during the reciprocation of said bolt for ener
11
2,406,461
gizingrsaid relay coil-sufficiently frequently to
keep said relay switch open, failure of said gun
to operate when said trigger switch is closed
causing the deenergization of said coil and the
resultant closing of said motor circuit, thereby
to initiate a cycle of, operation of said recharger
12
retracting the’ same and being constructed and
arranged to release'said bolt in its retracted posi
tion in order to restart the operation of said gun
if said switches are closed, an electric motor, a
driving connection between said motor and mem
her for moving the latter through its cycle dur
ing operation of said motor, an electric circuit
in which said motor is included, the high poten
tial side of said motor circuit being connected
10 to said ?ring circuit between said switches, a
motor circuits for opening the same.
7
time delay relay having a'switch in said motor
3. The construction de?ned in claim 1 in which
circuit and a coil, one side of the coil of said
means are provided to keep the motor circuit
to e?ect the retraction of said gun bolt.
2. The construction de?ned in claim 1 in which
a safety switch is provided in said ?ring and
closed if the ?ring circuit is deenergized before
the recharger has completed said cycle of operai
tion.
relay being connected to the high potential side
of said motor circuit, said coil being energized
by the closing of said safety switch immediately
4. A recharger for an electrically controlled
machine gun adapted to be ?red by the closing of
a ?ring circuit, a trigger switch operable for clos
to open said relay switch in the motor circuit, the
closing of said ?ring circuit by said trigger switch
functioning to initiate the operation of the ma
chine gun and the reciprocation of said bolt,
ing said ?ring circuit, said machine gun having
a reciprocable bolt adapted to be retracted nor 20 means operable upon the closing of said ?ring
switch to deenergize said coil, the drop out time
mally by the recoil of a ?red shell, said recharger
of said relay coil being greater than the period
comprising a member movable through a cycle
of reciprocation of said bolt, means including a
and in its movement through said cycle being
circuit for said coil having a normally open switch
engageable with said bolt for retracting the same
therein provided with an actuating member posi
and being constructed and arranged to release
tioned in the path of ‘said bolt and constructed
said bolt in its retracted position in order to re
and arranged to be actuated thereby normally to
start the operationof said gun if said ?ring cir
close said switch momentarily and periodically
cuit is closed, an electric motor, a driving con
during the reciprocation of said bolt for ener
nection between said motor and, member for mov
ing the latter through its cycle during operation
gizing said relay coil su?iciently frequently to
of said motor, an electric circuit in which said
motor is included, a relay including aswitch in
said motor circuit and a coil, one side of said coil
being connected to the high potential side of
said motor circuit and the other side of said coil.
being grounded through said ?ring circuit when
said trigger switch is open, said coil being ener
gized immediately upon the closing of said motor
circuit, to open said switch in said motor circuit,
the closing of said ?ring circuit by said trigger
keep said relay switch open, failure of said gun
to operate when said trigger and safety switches
are closed causing the deenergization of said coil
and the resultant closing of said motor circuit,
thereby to initiate a cycle of operation of said
recharger to e?'ect the retraction of said gun
switch'functioning to initiate the operation of
the ‘machine gun and the reciprocation of said
bolt, means operable upon the closing of said
bolt.
'
'
, 8. The construction de?ned in claim 7 in which’
means are provided to keep the motor circuit
closed if the ?ring circuit is deenergized before
the recharger has completed said cycle of oper
ation.
-
'
9. A- recharger for an electrically controlled
machine gun adapted to be ?red by the closing of
?ring'circuit to deenergize said coil, the drop out
time of said relay being greater than the period_ 45 a ?ring-circuit, a trigger switch operable for clos
of reciprocation of said bolt, and means includ
ing a circuit for said coil having a normally
open switch ‘therein provided with an actuating
member positioned in the path of said bolt and
constructed and arranged to be actuated thereby 50
ing said-?ring circuit, a safety switch in said
?ring circuit ahead of said trigger switch, said
machine gun having a reciprocable bolt adapted
to be retracted normally by the recoil of a ?red
shell, said recharger comprising a member mov
able through a cycle and in its movement through
normally to close said switch momentarily and‘
periodically during the reciprocation of said bolt
said cycle being engageable with said bolt for
for energizing said relay coil sufficiently frequent
retracting the same and being constructed and
1y to keep said relay switch open, said relay switch
arranged to release said bolt in its retracted po
operating to close said motor circuit upon failure 55 sition in order to restart the operation of said
of said bolt to reciprocate when said ?ring cir
gun if said ?ring circuit is closed, an electric
cuit is closed.
'
motor, a driving connection between said motor
and member for moving the latter through its
5. The construction de?ned in claim 4 in which
means are provided to keep the motor circuit ,
cycle during operation of said motor, an electric
closed if the ?ring circuit is opened before the 60 circuit in which said motor is included, a time
delay relay having a switch in said motor cir
motor has driven said member through a com- .
plete
cycle.
,
V
cuit and a coil, one side of the coil of said relay
6. The construction de?ned in claim 4 in which
being connected to the high potential side of
a safety switch is provided in said ?ring and
said motor circuit and the other side of said coil
motor circuits for opening the same.
65 being grounded through said ?ring circuit when
7. A recharger for an electrically controlled
said trigger switch is open, an electric lamp in
machine gun adapted to be ?red by the closing of
series with said coil and arranged in the connec
a ?ring circuit, a vtrigger switch operable for
tion between said coil and said ?ring circuit, said ,
closing said ?ring circuit, a safety switch in said
coil being energized upon the closing of said
?ring circuit ahead of said trigger switch, said 70 safety switch immediately to open the said relay
machine gun having a reciprocable bolt adapted
switch in said motor circuit, the closing of said
to be retracted normally by the recoil of a ?red
?ring circuit by said trigger switch functioning
shell, said recharger comprising a member mov
to initiate the operation of the machine gun and
able through a, cycle and in its movement through
the reciprocation of said bolt, means operable up
said cycle being engageable with said bolt for 75 on the closing of said ?ring switch to deener- '
2,406,461
13
gize said coil, the drop out time of said relay be
ing greater than the period of reciprocation of
said bolt, and means including a circuit for said
coil having a normally open switch therein pro
vided with an actuating member positioned in
the path of said bolt and constructed and ar
ranged to be actuated thereby normally to close
14
the periodic momentary closing of said bolt oper
ated switch, failure of said gun to operate when
said ?ring switch is closed deenergizing the coil
of said relay and permitting said relay switch
to close the motor circuit thereby initiating a
cycle of operation of said recharger to e?ect
the retraction of said gun bolt.
ll. The construction de?ned in claim 10 in
which a mechanically operated switch is provided
said switch momentarily and periodically during
the reciprocation of said bolt for energizing said
relay coil su?iciently frequently to keep said re 10 for closing the motor circuit, said mechanically
operated switch being closed by and during the
lay switch open, said relay switch operating to
cycling of the recharger.
close said motor circuit upon failure of said bolt
12. A. recharger for an electrically controlled
to reciprocate when said ?ring circuit is closed,
machine gun adapted to be ?red by the closing of
and means to keep the motor circuit closed if
a
circuit, a trigger switch operable for clos
the ?ring circuit is opened before the motor has
ing said ?ring circuit, a safety switch in said ?r
driven said member through a complete cycle,
ing circuit ahead of said trigger switch, said ma
said'last-mentioned means comprising a "circuit
chine gun having a reciprocable bolt adapted to’
for said motor circuit having a normally open
be retracted normally by the recoil of a ?red shell,
switch therein provided with an actuating mem
said recharger comprising a member movable
ber engaged and actuated by a part of said bolt
through a cycle and in its movement through said
engaging member at the beginning of said cycle
cycle being engageable with said bolt for retract
for, closing said motor circuit and at the end of
ing the same and being constructed and arranged
said cycle for opening said motor circuit.
to release said bolt in its retracted position in
10. A recharger for an electrically controlled
order to restart the operation of said gun if said
machine gun adapted to be ?red by the closing of
switches are closed, an electric motor, a driving
a ?ring circuit, a trigger switch operable for clos
connection between said motor and member for
ing said ?ring circuit, a safety switch in said
moving the latter through its cycle during opera
?ring circuit ahead of said trigger switch, said
tion of said motor, an electric circuit in which said
machine gun having a reciprocable bolt adapted
motor is included, said motor circuit being ar
to be retracted normally by the recoil of a ?red
ranged to be closed through a switch of a time
shell, said recharger comprising a member mov
delay relay means when the safety switch is
able through a cycle and in its movement through
closed, said time delay relay means including a
said cycle being engageable with said bolt for
low impedance circuit, a normal impedance cir
retracting the same and being constructed and
cuit connected to the high potential side of said
arranged to release said bolt in its retracted posi 2.: 1,! motor circuit and a coil, the coil of said relay
tion in order to» restart the operation of said gun
comprising a low impedance coil in said low im
if said switches are closed, an electric motor, a
pedance circuit and a normal impedance coil in
driving connection between said motor and mem
said normal impedance circuit, said low imped
ber for moving the latter through its cycle dur
ance circuit further including a switch construct
ing operation of said motor, an electric circuit in
ed and arranged to be opened simultaneously
which said motor is included, a time delay relay
with said relay switch in said motor circuit by en
including a coil and a switch associated with the
ergization of said low impedance circuit, a ?re
motor circuit and operable to open the motor cir
control relay including a switch for closing said
cuit, one end of the coil of said relay being con
low impedance circuit and a lock-in coil through
nected to the high potential end of the motor
which said low impedance circuit may be ground
circuit, the other terminal of the relay coil be
ed when said last-mentioned switch is open, said
ing arranged to be grounded through a lamp bulb
low impedance coil functioning to open the low
in series with the ?ring circuit whereby said re
impedance circuit and the motor circuit immedi
lay switch may operate to open said motor cir
ately upon the closing of said safety switch, said
cuit, said other terminal of said relay coil also 'H' control relay further including a switch in said
being arranged to be grounded through a bolt
normal impedance circuit for closing the same so
operated switch periodically momentarily closed
as to energize said normal impedance coil, said
by and during the reciprocation of said bolt for
last-mentioned coil functioning to keep said
energizing said relay coil su?iciently to keep said
switches of said time delay relay in said motor and
relay switch from closing thereby to keep said :1," low impedance circuits open, said control relay
motor circuit open, the electrical rating of said
including a pull-in coil which is arranged in a
relay coil being materially less than that of said
circuit that is energized upon the closing of said
motor circuit and the initial resistance of said
?ring switch, said pull-in coil functioning to open
lamp bulb being suf?ciently low so that upon clos
the switches of said control relay so as to open
ing Of the relay circuit, the coil will be energized
the normal impedance circuit, a bolt operated
at a rapid rate to open the motor circuit, the
switch constructed and arranged upon closing to
characteristics of the lamp bulb being such that
close the low impedance circuit, said bolt oper
upon lighting, the resistance thereof increases
ated switch being constructed and arranged to be
thereby limiting the current in the relay coil to e‘ closed periodically momentarily by the recipro
a safe value, the closing of the ?ring switch
cation of the bolt during the normal gun opera
functioning to energize the ?ring circuit and to
tion, means to prevent the deenergization of the
deenergize said relay coil and lamp bulb, said
coils of said time delay relay after opening of the
time delay relay being constructed to allow a
normal impedance circuit and before said low im
rapid opening of the relay switch and a rela
pedance circuit is closed through said bolt oper
tively slow closing thereof, the period of the clos
ated switch, the drop out time of said time delay
ing time of said relay being appreciably greater
than the period of operation of the machine gun,
the coil of said relay being wound so as to have
a sui?ciently low impedance that a sufficiently
relay being greater than the period of reciproca
tion of said bolt, closing of said bolt operated
switch functioning to energize the low impedance
coil sufficiently frequent to keep said relay switch
high excitation will be produced in the coil upon 75
2,406,461
15'
in said "motor circuit’open, failure of‘said ‘gun to
operate when said trigger and safety switches are.
closed permitting the deenergization of the coil
of said time delay relay and the closing of said
relay switch in said motor circuit.
,
7
13. The construction de?ned in claim 12 in
Which the deenergization of the low impedance
circuit permits the closing of the low impedance
circuit through the lock-in coil of the ‘control
relay so as to keep the motor circuit closed during 10
16
the’cy'cling of the recharger, the resistance of the:
low impedance coil being materially less than that
of the lock-in coil of the control relay so that
when the low impedance circuit is grounded
‘ through said lock-in coil said low impedance coil
will not be energized su?ciently to open the
switches of the time delay relay in either of the
motor or low impedance circuits.
KEMPER M. HAMMELL.
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