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2,409,404
J. C. TRO'YI'TERY
SHOCK ABsoRBING‘GUN MOUNTl
‘Filed
A. 9, 1942 _
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2 Slïxeets-Sheet 1
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INVENTOR
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J. c. TROTTER
2,409,404
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SHOCK ABSORBING GUN MOUNT
Filed Feb. 9. 1942
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2 sheets-sheet 2
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./ÚH/V C, TROTÍ'ER
BY
Patented Óct. 15, 1946
UNIED STATES PATENT OFFICE
2,409,404
SHOCK ABSORBING GUN MOUNT
John C. Trotter, Williamsville, N. Y., assignor to
Beil Aircraft Corporation, Buiïalo, N. Y.
Application February 9, 1942, Serial No. 429,986
6 claims.
(Cl. 89-42)
l
2
This invention relates to ordnance, and more
particularly to recoil shock absorbing gun moruit
mechanisms for rapid ñre guns such as machine
guns or the like. It is an object of the present
invention to provide an improved gun mount de
vice of the character described which is adapted
to be applicable to a variety of machine gun types
and to be adjustable to provide optimum recoil
is formed at its opposite sides with a pair of op
posed upstanding leg portions 2li-24 carrying
pins 2‘6-26 for mounting the rail-bracket struc
ture upon suitably apertured upper end portions
of a yoke member 28. Hence, the rail-bracket
assembly is mounted to be freely pivotable rela
tive to the yoke 2B about a horizontal axis coin
cident with the axes of the pins 26-26 for eleva
tional adjustments of the gun battery. It will
force absorbing and counter-recoil operations
under a variety of gun elevational adjustment 10 be understood that the yoke 28 may be mounted
upon a suitable base member (not shown) so as
conditions. Another object of the present inven
to be pivotable relative thereto about a vertical
tion is to provide a gun mount device including
axis, for azimuth adjustments of the gun battery.
an improved combination spring and hydraulic
The bracket 22 comprises a back plate por
recoil shock and counter recoil control means.
Another object of the invention is to provide a 15 tion 30 interconnecting opposite side plate por
tions 32-32 which extend forwardly and ter
gun mount device of the character described em
minate in corresponding socket portions 34-34
bodying design and structural improvements
telescopically embracing the rear end portions
whereby the device may be most economically
of the corresponding rails I8-l8. Threaded
manufactured in large quantities through means
of relatively simple shop processes. Another ob 20 fasteners `3‘6 transverse the bracket and rail mem
lbers for detachably ñxing the bracket 22 to the
ject of the invention is to provide an improved
rail assembly. A second transverse bolt 40 is
gun mount device of the character described
carried by the gun casing l0 adjacent the rear
wherein the functional unit portions thereof
end portion thereof by means of lugs 42 extend
are so provided as to be self-contained and readily
accessible for inspection, adjustment, repair, or 25 ing below the. gun casing; and the ybolt `40 is so
arranged as to extend at its opposite end por
replacement without substantial disruption of the
tions through suitably apertured gun brackets
entire gun mount assembly. Other objects and
`¿lll-fbi which slidably embrace the corresponding
advantages of the invention will appear from the
rails |8-l 8. Thus, it will be understood that the
speciiication hereinafter.
30 gun l0 is mounted upon the gun mount frame
In the drawings:
comprising the rail-bracket assembly by means
Fig. 1 is a top plan of a machine gun mount
of transverse bolts Ill-40 adjacent the front and
of the invention, showing a machine gun indi
rear end portions of the gun, respectively; and
cated by means of broken lines as being mounted
that the bolts lll-40 engage slide bracket de
thereon; and
35 vices Iii-I4 which are_slidably mounted upon
Fig. 2 is a side elevation thereof.
the rail members; and that the entire gun mount
The drawings illustrate the invention as being
frame assembly is mounted as an integral struc
embodied in a gun mount device supporting a
ture for gun elevational and azimuth adjust
machine gun having a main casing portion indi
ments upon the forked pedestal 28 at approxi
cated generally at i0, and having a gun barrel
and cooling jacket portion indicated at l2. A 40 mately the location of the center of gravity of
the gun and gun mount structure, by means of
transverse bolt I4 is carried by the gun s0 as to
the pins 2li-26.
extend at opposite sides thereof to engage a pair
The bracket 2i! is formed with an enlarged eye
of gun slide brackets It which have perforated
portion 45 extending forwardly from the leg Dor
lower end portions slidably embracing cor
responding mounting rails I8~l8. The rails 45 tions `2li-_24 of the bracket and across from one
of said leg portions to the other over the top
l8-l8 are arranged to extend parallel to the
of and in spaced relation with the gun to en
longitudinal axis on each side of the plan view
compass the gun casing and to provide a rigid
center 1ine I9 of the gun and at opposite sides
bracket structure having extensions lll for sup
thereof adjacent the lower level of the gun cas
ing. The rails Iii-I8 are interconnected ad 50 porting the usual gun accessory ammunition
magazine as indicated at 48; and the usual gun
jacent their forward ends by means of a trans
sight mechanism as indicated at 49. A pair of
verse bracket 2D, and adjacent their rear ends
brackets 50-50 are mounted by means of bolt
by means of another transverse bracket 22. The
connectors `52 upon corresponding of the rails
bracket 20 is permanently attached to the rails
l8-|8, as 4by means of welding or the like, and 55 |8-I-8 so as to extend rigidly therefrom in up
:2,409,404
4
ward and lateral directions. Lateral arm por- Y
tions 53-53 extend therefrom to provide further
mounting connection means for the magazine 48
and the gun sight device 59. The brackets 50-50
are socketed in their upper forward face por
tions so as to receive in slip-fitting relation there
in the rear end portions of corresponding tubular
members E11-54, so that the latter extend for
der is so dimensioned longitudinally as to limit
the extent of relative movement between the
cylinder and the plunger in response to action
of the spring 18 so as to prevent unintended
disassembly of the mechanism. Thus, it will be
understood that this unit of the gun mount de
vice is adapted to be readily assembled by simply
threading the rear end portion of the cylinder
75 over the plunger 15 while the spring 18 is
wardly therefrom and parallel to the correspond
ing rail members lll-I8. At their` forward ends 10 disposed therebetween, and then forcing the cyl
inder rearwardly until the slotted portion 19
the tubesSâ-Eli receive reduced end portions of
thereof registers with the plunger opening for
corresponding cylinder members 56-56 which
the pin Bil, whereupon the pin 8i! may be installed
are thereby also mounted to extend parallel to
to fix the unit in assembled condition without
the corresponding rail members Iii-I8. The
interference with the recoil absorbingand coun
cylinder devices 56-56 each include an oil cham
ter recoil assist action thereof.
ber portion accommodating a piston 58 slidably
Thus, it will be understood that the gun mount
mounted therewithin and carrying a plunger Bil
frame of the invention comprises essentially a
which extends from exteriorly thereof into the
parallel rail unit disposed adjacent the bottom
cylinder through the forward end thereof. At
level of the gun ca_sing; the rails being inter
their front ends the plungers Sil-60 pivotally
connect to the transverse gun bolt I4 so as to
connected by means of a pair of transverse
the recoil and counter recoil control units are
relieved of any bending loads such as would
45 tional units of the mechanism are self-contained
bracket devices adjacent forward and rearward
move forwardly and rearwardly with respect to
ends thereof. The gun is mounted upon the rail
the gun mount frame coincidentally with recoil
unit by means of transverse bolt and slide bracket
and counter recoil movements of the gun. A
compression spring 62 is provided in each of the 25 units adjacent the forward and rear end por
tions thereof; and the primary recoil shock ab
cylinders 56-5â for bearing between the rear
sorbing and counter recoil movement providing
end portion of the cylinder and the correspond
actions are furnished by means of a pair of
ing plunger 60 so as to provide the forces neces
plunger-cylinder units which are ñxed to the
sary for returning the gun to normal position
rail members and operatively connected to the
subsequent to each recoil movement thereof dur
gun by means of plunger members extending
ing ñring operations.
from one of the gun transverse bolts. An
It will be understood that the plunger-cylinder
auxiliary recoil shock absorbing and return
devices will be provided with suitable oil reser
assist spring mechanism is housed within a cyl-v
voir and valve devices as is customary in the
hydraulic shock dampener art, and that the 35 inder-plunger unit disposed adjacent the rear`
end of the gun and between the rail members>
mechanisms will be so arranged as to provide
of the frame; the auxiliary cylinder-plunger unit»
both recoil and counter recoil damping actions.
being pivotally connected at one of its ends to
It will be appreciated that the plunger-cylinder
another gun transverse bolt and at its other
units are thus each self-contained devices which
end to the rear rail bracket by means of slide
are adapted to function to assist in controlling
bolt connection devices extending through eye
the gun recoil and counter recoil operations in
portions of the auxiliary cylinder-plunger unit.
accord with modern ordnance practice. It will
The gun mount of the invention is thus so con
also be understood that due to the independent
structed and arranged that each of the func
mounting of the gun bolt i4 upon the rails Iii-I8,
otherwise be imposed thereon if the plunger
cylinder units were arranged to carry the weight
of the gun.
~
The bracket 22 includes a pair of inwardly
extending bosses 'l0-10 which are bored in com
mon alignment so as to be adapted to receive
a pin 'I2 when slidably inserted therethrough.
A cotter pin 13 is employed to ñx the pin 12 in
assembled relation upon the bracket. The boss
portions ïü--lß terminate short of abutting
relation to provide space therebetween to ac
commodate the eye portion 14 of a plunger 15
so that the latter is thereby pivotally mounted
upon the pin 'l2 to extend forwardly of the
boss members and parallel to the longitudinal
axis of the gun` A cylinder 16 is pivotally
mounted at a forward end portion 'l1 thereof
upon the transverse bolt 4D of the gun l0 so
and susceptible of economical manufacture by
means of simple sub-assembly methods; and the
entire mechanism is susceptible of final assembly
through means of a relatively few and simple
final assembly operations. Subsequent to final
assembly, the entire mechanism is of unusually
compact configuration; that is, it conforms
closely to the shape of the gun to be mounted
thereon and therefore adds little to the _bulk of
the gun and avoids any appreciable disturbance
of the balance thereof. Subsequent to mount
ing of a gun thereon, the entire gun mount as
sembly is particularly adapted to be serviced in
an improved manner, inasmuch as each of the
functional units of the gun mount mechanism
are so disposed and connected to the other units
thereof so as to be readily inspected, adjusted,
repaired or replaced without substantial dis
ruption of the balance of the gun mount as
p
as to extend rearwardly therefrom into telescopic 65 sembly.
Also, the gun mount of the invention provides
engagement over the plunger '15. A compression
a particular feature in that the auxiliary recoil
spring 'i8 is mounted within the cylinder ‘IB so
shock absorbing and counter recoil cylinder
as to bear against the plunger 'l5 to elastically
spring device 'I6-_18 is disposed intermediately of
resist recoil movements of the gun relative to the
the longitudinal axes of the rails i8--l 8 and of the
rali-bracket frame structure. The cylinder 'I6
longitudinal axes of the primary recoil and coun
is sloted longitudinally as at 19, and a pin 80 is
ter recoil control units 58-56. Consequently, re- ‘
arranged to be inserted within a suitably aper
coil and counter recoil Aforce loads are transtured portion of the plunger 15 so as to extendY
mitted through the primary cylinder units 56-56
outwardly thereof into the slotted portion of the
cylinder; and the slotted portion 'i9 of the cylin 75 at opposite sidesvof the gun adjacent the for
2,409,404
ward- end thereof and through the auxiliary
rails disposed to lie alongside the gun and inter-v
spring unit at the rear end of the gun and cen
connected at their corresponding opposite end
trally thereof, vwhereby the plan form stresses
portions by rigid bracket devices thereby forming
upon the gun. mount frame are maintained to
a rail-bracket structure, slide bearing means
slidably mounted upon said rails, connector de
vices extending from the gun and engaging said
bearing means whereby the gun is reciprocable
relative to said rail-bracket structure, a hydrau
lically damped recoil shock absorbing and coun
ter recoil control device mounted upon each of
said rails near the forward end of said rail
bracket structure and connecting said structure
with the gun at opposite sides of the center line
be always parallel to the axis of the gun. Conse
quently, development of forces suchas would
tendto twist or distort the gun mount frame are
avoided, and the recoil and counter recoil re
ciprocative movements of the gun relative to the
gun mount frame are at all times unhindered
as by binding of the slide bracket parts relative
to the rails IS-lß such as would otherwise
occur.'
It will be appreciated that the gun mount
structure of the invention embodies a novel com
bination of recoil and counter recoil force control
devices includingr a pair of primary control de
vices which may be of standard construction for
use in connection with lighter weight machine
guns; and that the auxiliary mechanism ‘I8 o'f -
the spring is provided to augment the control
of recoil forces thereof, and a recoil motion
' control and counter recoil force device mounted
upon the opposite end of said rail-bracket struc
ture for connecting said rails with said gun and
located so as to be under the center line of recoil
forces of said gun, said force device comprising
a cylinder having a coiled compression spring en
closed therewithin and a plunger slidable rela
action of the primary control devices so as to meet
the recoil control requirements of a relatively
tively therewithin and bearing against said
spring, and pivot connection means attaching
heavy gun installation. Thus, it will be under
opposite ends of said cylinder-plunger unit to
stood that the spring 'I8 will be selected so as to 25 said gun and said rail-bracket structure, respec
provide the necessary supplementary control ac
tively.
tion in any given case, and that the exchange
3. A gun mount including, substantially par
of springs having different force characteristics
allel spaced rails interconnected by transverse
for this purpose may be readily effected by sim
bracket devices thereby forming a rail-bracket
ply removing the pins 'Hl and 80 and disassem 30 structure, bearing means slidably mounted upon
bling the plunger-cylinder device ‘i5-'I6 and in
said rails and engaged with connector devices
serting a spring at 78 which will be predeter
extending from the gun to be mounted thereon
mined to have the necessary force characteris
whereby the gun will be reciprocable relative to
tics to provide the desired gun recoil operation
said rail-bracket structure, a pair of damped re
when acting in combination With the primary 35 coil shock absorbing devices mounted upon said
shock control units 5‘6-5S. Also, it will be under
rails near one end of said rail-bracket structure
stood that in cases wherein it is predetermined
and arranged to be operatively associated with
that the gun battery will be employed consistent
the mounted gun at opposite sides thereof to have '
ly to fire at relatively high angles of elevation,
their recoil reaction axes disposed in parallel re
a stiiîer spring will =be employed at 'I8 than if 40 lation, and a recoil motion control and counter
the battery is to ñre at substantially horizontal
recoil force device mounted upon the transverse
attitudes.
bracket device connecting said rails at the oppo
Although only one form of the invention has
site end of said rail-bracket structure and con
been shown and described in detail, it will be
necting said structure to the gun so as to have
apparent to those skilled in the art that the
its recoil reaction axis extending in plan View
invention is not so limited but that various
intermediately of the reaction axes of said
changes may be made therein without departing
damped control devices and parallel thereto.
from the spirit of the invention or the scope of
4. A machine gun mount including, a pair of
the appended claims.
50 spaced rails interconnected at their correspond
I claim:
ing opposite end portions by rigid bracket devices _
l. A mount device for a machine gun, said
thereby forming a rail-bracket structure, slide
mount device including a pair of spaced rails dis
bearing means slidably mounted upon said rails
posed to lie at opposite sides of the plan View
and engaged by connector devices extending from
center line thereof and substantially parallel to
the gun axis when mounted on said rails, said 55 the gun to be mounted thereon whereby the gun
will be reciprocable relative to said rail-bracket
rails being interconnected at their corresponding
structure, a pair of recoil shock absorbing and
opposite end portions by rigid bracket devices
counter recoil control devices mounted upon said
thereby forming a rail-bracket structure, slide
rails near one end of said rail-bracket structure
bearing means slidably mounted upon said rails,
connector devices extending for connection with 60 and arranged to be operatively associated with
the mounted gun at opposite sides thereof to have
the gun and engaging said bearing means where
their recoil reaction axes disposed in parallel re
by the mount is adapted to support the gun to
lation, and a recoil motion control and counter
be reciprocable relative to said rail-bracket struc
recoil force device operatively connected to the
ture, a hydraulically damped recoil shock ab
sorbing and counter recoil control device mount 65 gun and mounted upon the bracket device con
necting said rails adjacent the opposite end of
ed upon each of said rails and connecting said
said rail-bracket structure and having its axis
gun to said rail-bracket structure near one of the
corresponding ends of said rails, and a recoil mo
tion control and counter recoil force device
mounted upon said bracket structure near the 70
at least in one View between the reaction axes
of said first mentioned control devices.
5. A machine gun mount comprising a pair of
substantially parallel spaced rails, means for sup
porting said rails in spaced positionally ñxed re
lation, a front bracket fixed to each of said rails
center line thereof.
at a point substantially midway the ends of the
2. In combination, a machine gun and a mount
therefor, said mount including a pair of spaced 75 rail and extending radially thereof, a front gun
opposite corresponding ends of said rails and con
necting said rails with said gun beneath the
2,409,404
bracket paired with each of said front brackets,v
8
bracket paired with each of said front brackets,
each of said front gun brackets being slidably dis
each of said front gun brackets being slidably
posed upon one of said rails and extending ra
disposed upon one of said rails and extending ra
dially thereof, means for attaching said front gun
gun brackets to said gun, a recoil shock absorb 5 brackets to said gun, a recoil shock absorbing de
vice mounted between and connected to each pair
ing device mounted between and connected to
of front fixed and front gun brackets, a rear fixed
each pair of front fixed and front gun brackets,
dially thereof, means for attaching said front
a rear fixed bracket having rail-engaging mem
bracket having rail-engaging members carried by
the ends of said rails and extending radially
bers carried by the ends of said rails and extend
ing radially thereof, a rear gun bracket mounted 10 thereof, a rear gun bracket mounted upon each
of said rails and paired with each of said rail
upon each of said rails and paired with each of
engaging members, each of said rear gun brack
said rail-engaging members, each of said rear
ets being slidably mounted upon one of said rails
gun brackets being slidably mounted upon one of
said rails and extending radially thereof, and
and extending radially thereof, means traversing
means traversing the opposed rear gun brackets 15 the opposed rear gun brackets and attached to
said gun, whereby the rear end of the gun is
and attached to said gun, whereby the rear end
slidably supported upon said rails, and a counter
of the gun is slidably supported upon said rails.
recoil force device connecting said rear ñxed
6. A machine gun mount comprising a pair of
bracket and said rear gun brackets for cooperat
substantially parallel spaced rails, means for sup
porting said rails in spaced positionally ñxed re 20 ing with said shock absorbing devices to procure
counter recoil movements of said gun.
lation, a front bracket ñXed to each of said rails
at a point substantially midway the ends of the
JOHN C. TROTTER.
rail and extending radially thereof, a front gun
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