US2350946A - Ordnance - Google Patents

Description

' J. c. TROTTER ETAL June 6, 1944.

onnumcs I Filed April 3%, 1942 3 Sheets-Sheet 1 5 nu we N T A at M R WMW June 6, 1944. J. TROTTER arm. 2,350,946

ORDNANOE Filed April 10, 1942 5 Sheets-Sheet 2 f/al, 2/

I I T l ABM)? /M 8 I 1 iii/$.45?

- ANEYS June 6, 1944. J c, TROTTER ETAL 2,350,946

ORDNANCE vFiled April 10, 1942 3 Sheets-Sheet 3 Y w aan Patented June 6, 1944 UNITED STATES ATENT OFFICE DRDNANCE Application April 10, 1942, Serial No. 438,400

15 Claims.

This invention relates to ordnance, and more particularly to improvements in mounting and aiming mechanisms for use in conjunction with flexible machine guns or the like employing disintegrating ammunition belt feed means.

One of the objects of the invention is to provide an improved gun mount having incorporated therein an ejected link chute means and gun aim adjustment means arranged in combination and in such manner as to provide a novel and improved gun accessory mechanism. Another object of the invention is to provide improved means for actuating a machine gun or the like in connection with azimuth and elevational gun aiming adjustments. vention is to provide in a gun mount device an improved combination gun elevational adjus ment means and ejected ammunition belt link conduit means of unit form. Other objects and advantages of the invention will appear from the specification hereinafter.

In the drawings:

Fig. 1 is a side elevation of a gun mount and aim control mechanism of the invention, showing by means of broken lines the position of a pair of machine guns when mounted thereon;

Fig. 2 is a fragmentary rear elevation of part of the aim control mechanism of Fig. 1;

Fig. 3 is a fragmentary sectional view of the aim control mechanism;

Fig. 4 is a fragmentary top plan view showing a pair of machine guns mounted in conjunction with the apparatus of Fig. 1;

Fig. 5 is a section on an enlarged scale taken substantially along line V-V of Fig. 4

Fig. 6 is a side elevation of an aim control motor portion of the apparatus shown in disassembled relation;

Fig. '7 is a section taken substantially along line VII-VII of Fig. 6;

Fi 8 is a section taken along line VIII-VIII of Fig. 7 and Fig. 9 is a section taken substantially along line IX-IX of Fig. 8.

Fig. 10 is a bottom detached view of an actuating portion of the mechanism of Fig. 1.

The invention is illustrated in the drawings in conjunction with a gun battery comprising a pair of machine guns having casing portions l0-l2 from which extend corresponding gun barrels I l-l6. The guns are mounted upon a cradle comprising a plurality of tubular bearer members indicated at l8; said bearer members being arranged in pairs to lie in spaced relation and parallel to the gun. casings at opposite lower side Another object of the edge portions thereof. The bearers I8 are interconnected by means of transverse brackets 20-22 adjacent their front and rear ends, respectively; the brackets 2022 being rigidly connected to the tubes It! to provide therewith a rigid frame-like cradle for the guns. The guns l0-l2 are mounted upon the cradle so as to be longitudinally reciprocable relative to the cradle in connection with recoil and counter-recoil movements of the guns under gun firing conditions; each of the guns being slidably mounted relative to the front ends of the corresponding pair of cradle tubes l8-I8 by means of slide brackets 24, and relative to the rear end portions of the corresponding cradle tubes by means of slide brackets 26. Shock absorbing and movement damping mechanisms are arranged in connection with each of the guns for absorbing the gun recoil shock forces and providing the requisite counter-recoil movement forces and controlling the recoil and counterrecoil movements of the gun in the required manner. For this purpose a piston cylinder unit as indicated at 28 (Fig. 1) is coupled, in the case of each gun, by means of a pin 3'0 to the corresponding bracket 26 and at its other end by means of a pin 32 to the bracket 22; and it will be understood that each piston-cylinder unit will include a suitable elastic force means such as a compression spring or pneumatic chamber or the like, for absorbing the gun recoil shocks. Also, the unit will preferably include any suitable means for damping th recoil movements and the corresponding counter-recoil movements, in the required manner.

The gun cradle structure is arranged to be pivotally mounted about a horizontal transverse axis substantially intersecting the gun center lines by means of a pair of brackets 35-455 extending up- Wardly and rigidly from the innermost cradle tube 18-18 of each of the pairs of cradle tubes; and the brackets 35-35 are formed with inturned extensions 36-'38 (Fig. 5) which telescopically engage to provide in effect a single cross bar extending between the upper ends of the brackets 35-35. A screw 31 is arranged to be threaded into the extensions 36-35 to interconnect the latter to provide an integral cross bar unit upon assembly thereof. The cross bar assembly 35-46 is provided with spine teeth as indicated at 38 for spline connection with a correspondingly toothed portion 39 of a sleeve 46 which is arranged to be mounted upon the cross bar unit during assembly thereof.

A motor case 50 comprising essentially a pair of parallel side plates 5252 of sector form and a suitable marginal edge closure member 54 disposed between the side plates 52-52 to function as a spacer therefor. The motor case assembly includes a curvilinear portion enveloping the sleeve 40, and bearing devices 56 are arranged between the motor casing and the sleeve 40 to mount the latter in relatively rotatable relation about the axis of the cross bar unit 36-36. The side plates 52-52 'of the motor case 50 are connected to the closure member 54 by means of bolts 58-59, and thus the motor case provides a hollow chamber 60 of sector like form.

A packing ring 55 of rubber or Duprene or the to span the space of the chamber 60 in the manner of a vane type fluid pressure motor piston, and the piston 62 is cross shaped in section (Fig.

9)- and is fitted in the recessed edge portions thereof with suitable packing elements 64 for sealing the piston and casing engagement in substantially fluid-tight relation. The gasket members 64 willpreferabl-y be formed of some oil-resistant resilient composition material such as Duprene, or the like; and the gaskets 64 are preferably grooved as indicated at 65longitudinally thereof to facilitate effective sealing action. As illustrated in Fig. 8, the gasket strips 64-64 extend around about the hub 40 of the piston so as to seal the hub with respect to the motor case.

A pair of parallel circular-side plates 10-10 are mounted upon the corresponding brackets 35-35 by meansof bolts "II. A bracket I2 is arranged to act as a peripheral closure member for the space between the forward edges of the plates 10-10 and tocomplete therewith and in conjunction with the motor case 50 a unit structure ofdrum-like form. The member I2 is formed at its lower end with a downwardly extending socket portion I4 adapted to encompass the upper end of the gun battery mount-post (Fig. 1; and the portion 'I4is keyed to the post'I5 as by means of connectors I6. 7 The post I5 has a lower portion thereof extending injournaled relation within a bearing 'IB carried by a stationary base bracket 80. J The member 12- is formed with a pair of inturned bracket portions 8I-82 which register with corresponding opposite side wall portions of the :housing of the motor '50; and are rigidly connected thereto by means of bolts 83.

Thus, it will be understood that-the mounting post 15 is supported by thebase bracket 80 so as to be freely rotatable about its vertical longitudinal: axis whilebeing supported verticallylupon the;base. support; andthat the bracket I2 and the motor case 50 are carried by the post I5 as a rigidextension thereof, and that thereby the gun mount cradle structure .issupported by the post 15 while being rotatable about the horizontal axisextending through the cross arm unit 36-36. Consequently, the gun battery is mounted'to be 7 adjustable about the vertical axis of. the gun mount post I5 for azimuth adjustments of the gun battery aim; while the cradle structure carrying the guns is at all times pivotable about the horizontalaxis of the cross arm unit 36-36 for elevational aiming adjustments of the gun battery unit. v V U V The gun support bracket I2 is formed with a downwardly extending hollow cuff portion 04 which is in open communication with the space between the plates 10-10. The cuif 84 isopen at itslower end; and. the, side plates Ill-mare apertured as indicated at 86 at positions of registry with the ejected link ports of the corresponding guns. The space between the plates ID-I0 is so dimensioned as to accommodate the cartridge belt links as they are ejected by the guns, and thus it will be understood that the gun support unit comprises a hollow casing-like "structure of generally circular sectional form, and

that the ejected links are received between the plates I0 and allowed to fall freely through the cuff portion 84 to be discharged upon the ground or disposed of in any manner desired; and that the-ejected links are thus adapted to be received in this manner regardless of the elevational or azimuth adjustment position of the gun battery. 1

Fluid pressure supply means are arranged in connection with the motor case 50 for supplying fluid under pressure therein alternately at opposite sides of the piston 62 for controlling the elevational attitude or inclination of the gun battery in connection with gun battery aiming operations. For this purpose the motor case 50 is shown in Fig, 8 as having fluid conduits 90-90 arranged in open communication with the interior of the motor case at corresponding opposite end portions thereof; and it will be understood that the conduits 90-90 will lead to a suitable pressured fluid supply means. As illustrated in Fig. 1, the pressured fluid supply means comprises an electric motor coupled to a pump 96 carried by the base support 80, and it'will be understood that the pressured fluid supply system will include the necessary motor control mechanism and a suitable fluid reservoir, and the like;

as is conventional in connection with-hydraulic pressure mechanisms. A two-way valve is indicatedat 98 in conjunction with the. pump 96 and is arranged to be actuated in alternate directions so that the pump 96 will discharge fluid under pressure alternately through the conduits 90-90 into opposite ends of the motor case,50. To control the valve 98 a rocker arm 99 is arranged in conjunction therewith, and a pair of Bowden cables I00-I00 are coupled to the Opposite ends of the rocker 99 and are extended at their'opposite ends to connect to an opposite rocker arm I02 carried pivotally by the cradle bracket 22. A

crank arm I03 extends from the rocker I02 for the bracket 22so as to :be rotatable therein. The

rod I04 is freely rotatable and slidable within the tube I05 in vertical directions, and it is coupled to a lever I01 which has an end portion extend ing intoa recessed side portionof the bar I04 and is pivotally mounted upon afulcrum pin I08 carried by an enlarged end' portion 109- oithe sleeve I05. At its outer end the-lever I0! is bifurcated and pivotally connectedat IIO to the lower endof a handlebar II2 extendingfor convenient gripping by the gunner at; the rear end of the gun battery. A hand grip portion H4 is carried by the bar, Il2lfor the convenience of the gunner in manipulating'the mechanism. A link device I I6 is pivotally connected to the handlebar I I2 to extend in parallel spaced relation with respect to the outer'end'of the lever I01 and to pivotally engagea cap piece I I5 of the sleeve I05 through means'of a pin I I1 soas to provide a parallelogram linkage mechanism supporting the handlebar H2 for free vertical-movementrelative to the bracket 22 while. being also free to be oscillated'in sidewise directions about the vertical axis of the sleeve I 05. The enlarged end and cap portions I09II"5 of the sleeve I05 cooperate with the bearing lugs I--I06 to position the sleeve I against vertical displacement relative to the bracket 22. A tension spring H8 is arranged to extend between the rocker I02 and a stationary bracket II9 fixed to the cradle tubes I8I'8 for normally centering the rocker and hand grip H4 in neutral position.

Thus, it will be understood that upon application of downwardly directed manual pressure forces against the hand grip H4, the handlebar II2 will be depressed below neutral position; the push-pull rod I84 will be elevated; and the rocker I02 will be pivoted to actuate the Bow den cable system HID-I00 in such manner as to produce equivalent actuation of the valve control rocker 99 whereby the fluid pressure system. will force fluid under pressure into the motor case above the piston 02. Consequently, the piston will be driven downwardly within the case 56 and the gun battery cradle unit will be pivoted about the axis of the cross bar unit 3B-35 in such manner as to elevate the muzzles of the machine guns I4-I6. Reverse operation of the handle H6 will provide equivalent reverse elevational or muzzle depressing operation of the gun cradle unit.

To actuate the gun battery for aiming adjustments in azimuth, a fluid pressure vane type piston motor similar to the motor 55! hereinabovc described is mounted upon the stationary bearing portion 18, as indicated at 20 (Fig. l). The motor I20 is identical in construction with the motor 50 and has its outer case portion rigidly bolted to the stationary bearing portion 78 of the base frame 80. The vane type piston of the motor I20 is keyed to the gun mount post I5; and thus it will be understood that introduction of fluid under pressure within the motor case at alternate sides of the piston will provide the forces necessary to cause the gun battery to rotate relative to the base frame 56 about the vertical axis of the post '55. The motor I20 is coupled to the fluid pump 95 for pressured fluid supply purposes by means of conduits l2I- I2I, and a two-Way valve I22 is arranged in con unction with the pump 95 for controlling operation thereof so that pressured fluid will be furnished to the motor I20 as required for the purpose described. r

The valve I22 is provided with a control rocker I24 which is in turn coupled at its opposite ends to a pair of Bowden cables I2'6i 26; and the cables I26 are connected at their opposite ends to a spring centered rocker I28 carried by the sleeve I05 to extend at opposite sides thereof and integral therewith. Thus, it will be understood that if the handle H6 is pressed toward the left from neutral position (as viewed from the rear end of the gun battery) the tube I05 will be ro-' tated about its vertical axis to cause the Bowden cable system IQIi-IZE to operate the control valve I22 in such manner as to introduce fiuid under pressure into the motor I20 and against the motor vane so as to cause the gun battery to rotate in plan view clockwise direction about the axis of the post I5 for gun aiming purposes. Reversely, deflection of the control handle II4 to the right will result in operation of the motor I20 to drive the gun battery in opposite direction.

As designated at I30I30 (Fig. 8), a pair of abutments are preferably provided interiorly of the motor case at opposite ends thereof to register with the piston 62 for stopping movement of the latter as the gun mount cradle reaches its corresponding predetermined limit of aiming ad justment. Hence, the entire aim adjusting power and control mechanism is composed within a selfcontained unit of utmost compactness of form.

As a further special feature of the gun mount arrangement of the invention, the cradle tubes I8I8 next adjacent the opposite sides of the bracket member 12 are each provided with a bracket I34 carrying a roller i325 (Fig. l) for bearing laterally against opposite side portions of the bracket extension 12 which provide curved trackways for the rollers I35--I35 which are disposed in free-rolling relation thereagainst. Thus, it will be understood that the gun mount cradle will be braced relative to the bracket I4 which extends rigidly from 'the' post'15,'by means of the opposed rollers I35--I35- which are located at a substantial distance ahead of the position of the bearing connection between the cradle cross arm 3636 and the motor case bearings 5656. Consequently, the gun cradle is at all times braced against lateral and twisting dis tortion about its cross arm bearing relative to the bracket 14 while being freely rotatable at all times about the horizontal axis of the cross bar member for elevational adjustments of the gun battery. Thus, it will be appreciated that particularly in connection with azimuth adjusting movements of the gun battery about the axis of the post I5, the inertia forces will be taken through the rollers I35I35 and through the cross bar bearing unit at relatively widely spaced positions whereby the cradle is efiectively braced against lateral distortion forces.

It will be appreciated that in addition to the special features and advantages of the invention specifically pointed out hereinabove, the novel arrangement of the motor mechanisms for adjusting the gun battery aim provides important novel results. In this respect, attention is called to the fact that the motor mechanisms are of the fluid pressure type, and that thereby full advantage may be taken of recent developments in the hydraulic power art such as have adapted hydraulic power systems to be preferred for use in controlling modern ordnance installations. It is particularly noteworthy that in the present instance the motor case is of sector sectional form and arranged With its apex portion embracing the cradle cross bar whereby the vane type piston can be directly coupled to the cradle cross bar. Thus, the piston is functionally an integral part of the gun battery cradle, and need of intermediate power transmission devices is obviated. At the same time the arcuate form of the motor case adapts the latter to be nested between the ejected link guiding plates I0''I0 and within the radial confines thereof, without interfering with provision of a suitable ejected link passageway between the plates I0'I0 at the forward portions thereof for gravity discharge of the links through the cufi 84. Thus it will be understood that in eife'ct, the elevational adjustment motor occupies only an otherwise unused space between the twin guns and between the ejected link guide plates 10-10, and that the presence of the motor in this position requires no enlargement of the space between the plates 73-10 whereby a twin gun battery of improved compactness is provided.

Although only one form of the invention has been shown and described in detail, it will be apparent to those skilled in the art that the invention is" not so limited but that various changes may be made therein without departing from the to mount thereina pair of guns in parallel sidebyside relation, cross bar means mounting said cradle relative to said support So as to be pivotable relative to said support about a horizontal axis through said cross bar means for gun elevaso as to be adapted to receive beltlinks as: they are ejected from said gun for transmission there- 7 of through said casing interior toa linkldischarge bottom portion thereof, and'a fluid pressure motor case of 'vertically elongate. form mounted within the confines of the rear portion tional aiming purposes, said supporthaving .a

hollow casing portion thereof extending between the positions of the mounted guns and being gen- 7 erally of circular sectional form and disposed con centrically of said axis of rotation and having opposite side wall portions thereof apertured forlike, comprising a'support, a gun cradle adapted wardly of said axis of rotation to register with the V ammunition belt ejected link ports of the corresponding of said guns so as to be adapted to receive belt links as they are ejected from said guns for transmission thereof through said casing interior and outwardly thereof at the bottom portion thereof, and a vane type fluid pressure motor case of segmental and vertically elongate form mounted upon said support to extend Within the rear portion of said casing and having a piston it .1

therewithin extending into keyed relation with said cross bar means and adapted to oscillat in vertical direction, and means for introducing fluid under pressure to said motor case-in controlled manner alternately at opposite sides of said piston to actuate saidpiston to'c'ause said cradle to oscillate accordingly in controlled manner about said axis of rotation for elevational adjustments of the gun battery aim.

2. A mount for a machine'gun or the like, com

prising a support, ag'un cradleadapted to mount therein a gun, bar means mounting said cradle relative to said support so as to be pivotable relative to said support about a horizontal axis through said bar means for gun elevational aiming purposes, said support having a hollow casing portion extending adjacent the position of the mounted gun and in side-by-side relation therewith and being generally of circular sectional form and disposed concentrically ofsaid axis of rotation and having a side wall portion thereof support to extend within the rear portion of said casing and having a piston therewithin extending into keyed relation with said bar means and adapted to oscillate in vertical directions, and means for introducing fluid under pressure to said of said casing and having a piston member'adapted to oscillate in' vertical directions" and-keyed ,to said cradle, and. means for introducinglfiuid under pressure to said motor case alternately at opposite sides of said piston to cause said cradle to oscillate in controlled manner about said axis of rotation for elevational aiming adjustments of the mounted gun. f r

4. A mount for a pair of machine guns or the to mount therein a pair of'gu'ns in parallelsideby-side relation, cross bar means mounting said cradle relative to said support so as to be pivotable relative to said support about a horizon} tal axis through'said cross bar means for gun elevational aiming purposes, said support having a hollowcasing portion extending between the positions of the mounted guns and being generally of circular sectional form and disposed concentrically of saidraxis of rotation and having opposite side wall portions thereof apertured forwardly of said axis of rotation to register with the ammunition belt ejected link ports of the corresponding of said guns so as to be adapted to receive belt links as they are ejected from said guns for transmission thereof throughsaid casing interior and outwardly thereof at the bottom portion thereof, and a fluid pressure motor case of vertically elongate'form mounted upon said support to extend within the rear portion of said casing and having a piston therewithin adapted to oscillate in vertical directions and extending into keyed relationwith said cross bar means, and means for introducing fluid under pressure to said motor casein controlled mane ner alternately at opposite sides of said piston to cause said cradle to oscillate in controlled manner about said axis of rotation for elevational adjustments of the gun battery aim; r

5. A mount for a pair of machine guns or the like, comprising a support, a vane type fluid pressure motor case of arcuate form mounted upon said support to be disposed fiat-wise in vertical directions and having its apex portion apertured, a gun cradle adapted to mount therein a pair of guns in spaced parallel side-by-side relation, said cradle having a cross bar extending through said motor case apertured portion, bearing means mounting said cross bar relativ to said case so that said cradle is pivotable relative to said supmotor casein 'controlledmanner alternately at I opposite sides of said piston to cause said cradle to oscillate in controlled manner about said axis of rotation. f a

3. A mount fora machine gun or' the like, comprising a support, a cradle adapted to mount therein a gun, means" mounting said cradle relative to said support so as tobe 'pivotable about a horizontal axis relative to said support for gun elevational aiming purposes, said support having a hollow casing portion being generally of circular sectional form and'disposed to be intersected by said axis of'rotation and havinga side wall portion thereof apertured to register with the ammunition belt ejected'port of said gun (5 and means for introducing fluid under pressure port about a horizontal axis extending through said crossbar for gun elevational aimingpury between the positions of said plates to span the space between'the forward edges thereof, said plates being apertured in registry with the anrmunition-belt ejected link ports of the correspending of said guns so as to be adapted tore ceive belt links as they are ejected from said guns for gravity transmission thereof between 1 said plates to a position of link discharge at the bottom portions thereof, a vane type piston within said motor case and adapted to oscillate in vertical directions and keyed to said cross bar,

to said motor case in controlled manner alternately at opposite sides of said piston to cause said cradleto oscillate in controlled manner about said axis of rotation.

6. A mount for a pair of machine guns or the like, comprising in combination a support, a gun cradle adapted to mount therein a pair of guns in parallel side-by-side relation, means mounting said cradle unit relative to said support so as to be pivotable about a horizontal axis relative to said support for gun elevational aiming purposes, said support having a hollow casing portion extending between the positions of the mounted guns and intersecting said axis of rotation and having opposite side wall portions thereof apertured forwardly of said axis of rotation to register with the ammunition belt ejected link ports of the corresponding of said guns so as to be adapted to receive belt links as they are ejected from said guns for transmission thereof through said casing interior to a link discharge bottom portion thereof, a vane type fluid pressure motor case of arcuate form mounted within the rear portion of said casing and having a portion embracing said cradle mount means, a vane type piston within said case and keyed to said cradle, means for introducing fluid under pressure into said motor case in controlled manner alternately at opposite sides of said piston to cause said cradle to oscillate in controlled manner about said axis of rotation, a shaft extending vertically from said support and keyed thereto, positionally stationary bearing means engaging said shaft to support the latter for rotation about a vertical axis, and a second fluid pressure motor means comprising a motor case fixed to said stationary bearing means and having the piston thereof keyed to said support for oscillating said support and said cradle for azimuth adjustments of the gun aim.

7. A mount for a. pair of machine guns or the like, comprising a support, a gun cradle adapted to mount therein a pair of guns in parallel sideby-side relation, said cradle carrying a cross bar rotatably mounted upon said support whereby said cradle is pivotable about a horizontal axis relative to said support for elevational gun aiming purposes. said support having a portion extending between the positions of the mounted guns and curved concentrically of said axis of rotation and having opposite Side wall portions thereof shaped to provide trackways, and roller means carried by said cradle and disposed to bear against said trackways at positions spaced substantially away from the position of said cross bar for stabilizing said cradle against distortion.

8. A mount for a pair of machine guns or the like. comprising a support a gun cradle adapted to mount therein a pair of guns in parallel sideby-side relation. said cradle being mounted by means of a cross bar portion thereof upon said support so as to be pivotable about a horizontal axis relative to said support for elevational gun aiming purposes, said support having a hollow casing-like portion thereof extending between t e positions of the mounted guns. said casing-like portion bein generally of circular sectional form and disposed concentrically of said of rctation and having opposite side Wall portions thereof aperturod forwardly of said axis of rocharge bottom portion thereof, said casing-like portion having transverse wall means interiorly separating a sector-shaped portion thereof from the remainder thereof to provide a vane type fluid pressure motor case device having its apex embracing said cross bar, a vane type piston mounted within said case device in fluid pressure tight relation therewith and having a sleeve portion thereof embracing said cross bar and keyed thereto, and means for introducing fluid under pressure Within said case device at opposite sides of said piston for causing said gun mount cradle to oscillate in controlled manner about said axis of rotation,

9. A mount for a pair of machine guns or the like, comprising a support, a gun cradle adapted to mount therein a pair of guns in parallel sideby-side relation, said cradle being mounted by means of a cross bar portion thereof upon said support so as to be pivotable about a horizontal axis relative to said support for elevational gun aiming purposes, said support having a hollow casing portion extending between the positions of the mounted guns, said casing being generally of circular sectional form and disposed concentrically of said axis of rotation and having op posite side wall portions thereof apertured forwardly of said axis of rotation to register With the ammunition belt ejected link port portions of the corresponding of said guns so as to be adapted to receive ejected belt links from said guns for transmission thereof through said casing interior to a link discharge bottom portion thereof, said casing having transverse wall means closing a sector portion thereof to provide a vane type fluid pressure motor case disposed with its fiat- Wise extent directed vertically and having its apex embracing said cross bar, a vane type piston mounted within said casing in fluid pressure type relation therewith for oscillation in vertical directions and having a sleeve portion thereof embracing said cross bar and keyed thereto, said piston being recessed at its edge portions and having mounted therein complementing strands of resilient packing material for sealing the piston relative to said motor case against fluid leakage.

10. In a machine gun mount, a support carrying a bearing, a cross member extending into said bearing and rotatably supported thereby, a vane type fluid pressure motor case mounted upon said support to embrace said cross member, a gun mounted upon said cross member, a vane type piston within said case and fixed at one end to said cross member, and packing means for sealing said piston relative to said case comprising piston edging members of elastic material carried by said piston along its upper and lower side edge portions.

11. In a machine gun mount, a support carrying a bearing, a cross member extending into said bearing and rotatably supported thereby, a vane type fluid pressure motor case mounted upon said support to embrace said cross member, a gun mounted upon said cross member, a vane type piston within said case and having an eye shaped end portion encompassing said cross member and keyed thereto and formed to substantially occupy the interior of said motor case in the region of said cross bar whereby said piston effectively divides the interior of said case into a pair of fluid chambers, and packing means for sealing said piston relative to said case comprising piston edging members of elastic material carried by said piston along its upper and lower side edge portions and extending around about said eye "portion.

12. A mount for a pair of machine guns or the like, comprising a support, a vane type fluid pressure motor case of arcuate form disposed with its flat-wise extentdirected vertically and mounted upon said support and having its apex portion apertured, a gun'cradle adapted to mount therein a pair of guns in spaced parallel side-by-side relation, said cradle having across bar extending through said motor case apertured portion, bearing means mounting said cross bar relative to' said case so that said cradle is pivotable relative to said support about a horizontal axis extending through said cross bar for gun elevational aiming purposes, a pair of circular plates apertured centrally and fixed to said cradle to be disposed in parallel spaced relation and to embrace said motor at opposite sides thereof, said support having a front closure portion extending upwardly between the positions of said plates to span the space between the forward edges thereof, roller 7 means carried by said gun cradle and extending laterally therefrom at a position spaced from said cross bar into roller bearing relation against said support front closure portion for bracing said cradle relative to said support against twisting about said cross bar, said plates being apertured in registry with the ammunition belt ejected link ,ports of the corresponding of said guns so as to be adapted to receive belt links as they are ejected from said guns for gavity transmission thereof between said plates to a position of link discharge at the bottom portions thereof, a vane type piston within said motor case for oscillation in vertical direction and keyed to said cross bar, and means for introducing fluid under pressure to said motor case in controlled manner alternately at opposite sides of said piston to cause said cradle to oscillate in controlled manner about said axis of rotation.

13. In a machine gun mount, a support carrying a bearing, a cradle including a cross member extending into said bearing and rotatably supported thereby, a vane type fluid pressure motor case mounted upon said support to embrace said cross member, a gun mounted upon said cradle, a vane type piston within said case and fixed at one end to said cross member, a base mounting saidsupport thereon so that said support is rotatable relative to said base about an axis transverse to the axis of said cross member, motor means operably coupled to said base andto said support for providing rotation of said support upon said base, and a control device for said fluid pressure motor and 'for said motor means comprising hand grip means carried by said cradle and being shiftable relative to said .cradle in transverse directions consonant with the directions of rotation of said cradle relative to said support and of' said support relative to said basejand means connecting said control device and said fluid pressure motor and said motor means for controlling the latter to provide gunaim adjusting movements of said cradle corresponding to movements applied manually to said hand grip means. 7 14. A gun battery accessory comprising a hollow drum-like casing adapted to 'bedisposed between the'positionsof a pair of parallel mounted guns and to function as a support therefor, said casing being generally of circular sectional form and having bearing means disposed concentrically of the axis ofelevatio nal aim adjusting rotation of said guns, said casing havingopposite side wall portions thereof apertured forwardly of said axis of rotation to register with the ammunitionlbelt ejectedlink ports of said guns so as to under pressure to said motor mechanism in controlled manner to provide such oscillation movements; V l 1 V 15. In a'maohine gun mount, a support carrying a bearing, a cradle including a cross member extending into said bearing and rotatably supportedthereby, a pressure motor case mounted upon said support,'a gun mounted upon said cradl a piston within said case and fixed tosaid 1 cross member, a base -mounting said support thereon so that said support is rotatable relative to said base about'an axis transverse to the axis of said cross member, motor means operably coupled to said base and to said supportfor providing rotation of said support upon said base, and l a control device for said fluid pressure motor and for said motor means comprising hand grip means carried by said cradle and being shiftable relative to said cradle in transverse directions consonant with the directions of rotation of said oradlerelative tosaid'support and of said,

support relative to said base, and means connecting said control device and said fluid pressure motor and said motor means for controlling the latter to providegun aim adjusting movements of said cradle corresponding to mopements'ap- 'plied' manually to said hand'grip means,

JOHN 'C. TRO'ITER. LE ROY F. MAURER.

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