Dec. ' 3, 1946. J, c, TROTTER 2,412,109 GUN AND SIGHT MOUNTING Filed Dec. 5, 1945 3 Sheets-Sheet. 1 INVENTOR ‘ , John TroH'er ATTO R N EYS ‘ ' Dec. 3, 1946. - ' J, C TROT‘T‘ER' - , 2,412,109 GUN AND SIGHT MOUNTING Filed Deb. 5, 1943 ‘ ‘ 3 Sheets-Sheet Fig. Z.v 55 ' I20 62 59 42 62 lNVéNTOR 15x2 John B9. TroHer ‘Y _ ATTO RN EY$ 2Al2,109 Patented Dec. 3, 1946 ATENT * * UNITED‘ STATES OFFICE: ._ -. 2,412,109 GUN AND SIGHT MOUNTING John C. Trotter, Burlington, Vt, assignor to Bell Aircraft Corporation, Buifalo, N. Y. Application December 3, 1943, Serial No. 512,754 4 Claims. 1 . ‘ VThis invention relates to ordnance, and more - particularly to gun mounts and associated ammu nition feed arrangements. ‘ - One of the objects of the invention is to pro vide a new and improved plural gun mount ar rangement permitting relatively wide range ad justments of the gun battery aim both in eleva tion and in azimuth. Another object of the (Cl. 89-375) 2 -' whereby the bracket l4 projects therefrom to support the gun battery as an independent unit exteriorly of the mounting vehicle and in closely connected and generally streamlined relation therewith. An upper bracket l6 (Fig. 1) is also provided to be ?rmly attached to a. correspond ingly positioned framing portion I8 of the mount ing vehicle structure. ‘ A central post‘ 20 extending between the lower invention is to provide agun'mount arrangement of the character described ‘which is of improved 10 and upper brackets l4—l6 is mounted thereon compactness and structural ruggedness, and so constructed as to be adapted to maintain the by means of bearing connections at 22-24, whereby the post 20 is supported upon‘tne mount ing vehicle in a vertical attitude and centrally guns in “steady” supported relation despite the of the gun battery position andso as to be freely relatively wide angles of permissible gun aim adjustment range. Another object of the inven 15 rotatable about the vertically aligned axes of the bearings 22—24, Intermediately of its length the tion is to provide a gun mount device of the char post 20 is laterally enlarged as indicated at 26 acter described which is adapted to be assembled and transversely flattened to provide a rigid gun as a single compact unit which is suitable to be mount post 'of minimum thickness transversely attached to a carrying vehicle or the like and detached therefrom for servicing purposes with 20 of the gun direction. The post 20 is recessed as indicated at 28 to accommodate in nested relation improved facility. Another object of the inven therein the outer case of a vane piston type hy tion is to provide an improved gun battery ar draulic motor as indicated at 30; the motor case rangement of the character described which also 30 being of a thickness dimension generally’equal embodies improved ammunition storage and feed ing means, whereby a relatively large supply of 25 to that of the post 20 and being segmentally shaped in side view with the apex portion thereof ‘ammunition may be stored in conjunction with occupying the region of the center of rotation of the guns of ‘the battery and feed thereto without the gun battery for elevational aim adjustment assistance from an ammunition feed booster purposes. ' ‘device or the like. Other objects and advantages of the invention, will appear in the speci?cation 30 The piston of the motor case 30 is keyed to a cross shaft 32 (Figs. 1 and 2) which extends at its opposite ends exteriorly of the motor case and In the'drawings: thence downwardly to form in effect a pair of Fig. 1 is a side elevation of a gun mount and opposite stirrup arms 34-34 which ?xedly jen ammunition magazine arrangement of the inven tion, shown in conjunction with a “twin” ar 35 gage upon corresponding inner rod members rangement of machinevguns and carried at the '36—-36 of a gun mount frame which is designated generally at 40. The gun mount frame 40 com nose or tail portion of an aircraft or other vehicle prises a group of four rods arranged in parallel or the like; ' relation ‘and comprising a pair of outer rods ' Fig. 2 is a top plan of the gun mount and mag 42—42 in addition to the inner rods 38-46. The azine arrangement of Fig. 1; ' hereinafter. - ' Fig.‘ 3 is an end view thereof; and P Fig. 4 is‘an enlarged vertical section of the 'aim sight ‘mechanism. ' ’ rods 36-4Z are interconnected at their front and rear ends respectively by‘ cross brackets 44-46, to provide an integral frame-like struc ture. The guns Hl—'-l0 are carried by the gun In the drawings the invention is illustrated in the form of a gun mount and ammunition 45 mount frame structure 40 by ‘means of separate magazine arrangement in conjunction with a pair E slide ‘brackets 48-49 extending from rear and front end portions of the guns; the brackets of "twin” guns of the conventional machine gun 48-49 being slidably mounted upon correspond type as ‘are illustrated at ‘l0—l0; the gun battery ing pairs of thelrods 36—42. Hence, the guns being shown mounted uponthe nose 'or tail end portion of an aircraft or other vehicle body as 50 are independently reciprocable relative to the indicated at H. ‘The gun mount structure is ' frame M in directions longitudinally of the guns for recoil shock absorbing purposes. Hydraulic shown ‘as'comprising a lower bracket l4 arranged pneumatic shock absorber devices, as indicated tobe 'deta'chablyconnected to and toy extend rig at 50, are connected between movable bracket idly from anyrsuitable', framing structure of the vehicle, such as is‘indicated at l5 of Fig. 1, 55 and ?xed bracket portions of each gun mount ll) #112,109 4 arrangement to cushion the shocks of the gun recoil forces and to provide counter-recoil move ments of the guns. frame 40 and the center post 20 to control, re-' Thus, it will be understood that the guns a suitable motor driven hydraulic pump device may ‘be mounted upon the vehicle I2 and ar ranged to be controlled by a valve mechanism ‘I6 which is manually operable by a control spectively, the elevational and azimuth aim posi tions of the gun battery. As indicated at ‘I5, l0—I0 are carried upon the frame M] in such manner as to be individually reciprocable rel ative to the frame in connection with their re~ spective recoil and counter-recoil movements, whereby the frame will [be relieved of Violent handle TI arranged within convenient reach of the gun operator. The pump device ‘I5 will be recoil forces such as are usually imposed upon 10 connected to the motor devices 30-40 by suit a gun carriage. The frame is rotatably mounted able hydraulic conduits, as is well known in the by means of the cross shaft 32 upon the motor hydraulic motor art; and thus it Will be ap case 30 which is ?xed to the center post 20, preciated that through manipulations of the whereby the gun battery is freely rotatable about control handle T1 the gunner will have full the horizontal axis of the shaft 32 for gun ‘eleva 15 selective control of the motors 30—‘I0 so as to tional aiming purposes, while the center post 20 operate the latter to selectively adjust the gun is freely rotatable about its vertical a‘xisfor azi; battery aim' both in elevation and in azimuth muth adjustments of the gun battery aim. at will. Disposed at each side of the gun battery, and A gun sight device as indicated at 80 may aligned generally parallel to a respective one be conveniently arranged in conjunction with oftheguns 10+“) is mounted an ammunition the gun battery and may be mounted by means magazine 55. The magazines 55-7-55 are alike of a bracket 8I carried by a shaft 82 extending and are of drum-like formation and are mounted transversely of the upper end of a gun sight to'rrermainatrall times parallel to the'guns and frame 83 which pivots at its lower end upon a to ‘rotate therewith in connection with both azi 25 cross shaft 84. The shaft84 is carried by a yoke muth‘ and elevational, aim adjustments of the 85 which is in turn pivotally mounted in a ver guns. To this end a frame comprismg alovver tical bearing ‘86 supported by the stationary cross bar 56; an upper cross bar 58; side mem structure I8 of the mounting vehicle. Thus, the bers 59 and interior vertical members 60'—'6'0 are entire sight mount is rotatable about the axis provided to carryv bearing devices at B2 to sup 30 of the bearing 86 forazimuth aim adjustments, port stub shaft members extending from op and the upper portion of said gun sight frame posite sides ‘of the magazine drums 55—55. portion 83 and thesight-carrying- bracket Bl are Thus, theframe carries the drums to rotate with both rotatable upon horizontal axes for eleva ' the gun battery in connection with azimuth ad tional aim adjustments. justments thereof, While at ‘thesame time the The yoke 85 carries a sprocket 81 which is drumsare free to rotate with the guns relative geared by means of a suitable endless chain to the frame work in connection With eleva or the like to a corresponding sprocket 88 car- _ tional aim adjustments of the gun battery. ried by the upper end of the post 20, whereby rotation of the post ‘20 upon the bearings 22-24 will cause the sprocket 8'!- to turn the sight carrying yoke 85 for adjustments of the sight aim suitableelinks extending between the gun mount frame 40 and the magazine dru'ms‘55-55 syn chronize rotations thereof in connection with the elevational aim adjustments of the gun battery. in consonance with azimuth adjustments of the aim of the gun battery. A vertical shaft 89 is carried within the upper portion of the post 20 and carries at its lower end a bevel gear 90 and at its upper end a sprocket 9|. The bevel The magazines 55-55 are formed with am munition belt outlet ports 654455 at the top por-v tions of the magazines; and rollers Bt—66 are carriedby each magazine adjacent the outlet port thereof'to smoothly guide the training of belted gear 90 is geared to a crank arm 92 which eX ammunition therefrom into the ammunition feedway portions of the associated guns. Thus, tends from the gun mount frame 40 eccentrically of the horizontal» axis of rotation thereof by it will be understood that ammunition belts may _ means of a gear 93; a strut 94; and an arm 96. be compactly nested interi'orly of the magazines An endless chain or the like interconnects‘ the sprocket 9i and a sprocket I00 (-Fig. 4) carried through the outlet ports 56-56 into the closely by a shaft I02 within the yoke 85 and con positioned ammunition feedway mechanisms of centrically of the bearing 80. The shaft I02 the associated guns. It will be appreciated that 55 carries a bevel gear I03 which meshes with a so as to fill the latter and to train therefrom due to the fact that the ammunition supply for each gun is compactly nested in the region of the horizontal axis of the gun battery and close to gun ammunition feedways, the pull forces required to feed the ammunition to the guns 60 are always at a minimum, and that the directions of twisting of the ammunition belts ‘While feeding the guns remain the same atlall times. gear I04 whichis keyed to the sight frame 83 by bolts I05. A spur gear segment I06 is mounted concentrically of the shaft 84 and is keyed to the yoke 85 as at I01, and the gun sight frame 83 carries a ‘train of meshed ‘gears I08 I08 upon bearings. I'M-I09 which interconnect the gear I06 and an oppositely disposed gear I I0 carried by the top shaft 82 and keyed thereto as at I I I. Thesha-ft 82 is‘ in turn keyed to the A motor device is carried by the support -» bracket I6, as indicated at ‘I0 (Fig; 1) and may 65 sight bracket 81 by means of "pins II2'_-II2; conveniently comprise a second hydraulic motor whereby it will be understood that movements of the vane piston type as employed at 30. Thus, of the gun carriage crank 92 will cause the bevel the 7 motor‘ 10 will comprise an outer casing gear and sprocket mechanism to rotate the frame which is ?xed by the bracket l6 to be stationary 03 about the shaft 84.‘ This motion in turn relative to the frame of the mounting vehicle, causes the gear train I 08—l_08 to tilt the ‘gun and the piston element of the motor ‘I0 will be sight frame and to drive the sight bracket 8| 76 keyed to the ‘upper vend of the center post 20. Hence, application of ?uid pressure forces at op posite'sides of the pistons of the motors, 30-10 will procure corresponding oscillations of the gun to- rotate relative ‘to the‘ frame 83, and the gear and chain devices are so arranged as to provide such total tilting’ movements of the sight 80 as to' maintain its line of sight at all times 2,412,109 parallel-to the vdirection of elevational aim of thegl-m's? 1- ' i " - means interconnecting said central post and said frame for rotating the latter about its vertical -In?_ this ‘manner it is arranged that the sight tU‘will-shift' automatically both bodily and an axis coincidentally with the rotations of said gun mount carriage about the vertical axis of said gularly relative to the position of the gunner’s central post.~ head in connection with adjustments of the gun ‘ ‘ ‘ , 2. ‘In combination, a gun mount comprising a gun carriage having dual guns mounted thereon elevational aim whereby to require less strains. in spaced parallel relation, a central post extend and twistings of the gunner’s body and neck in ing vertically between said guns and mounted following the sight. Thus, it will be understood that the'gun sight device 80 will rotate under all 10 upon a ?xed frame portion, said central post supporting said carriage for rotation therewith conditions of gun aim adjustment in synchronism about a vertical axis for azimuthal aim adjust with the gun battery movements, whereby the ments of the gun carriage, a shaft mounting said gunner may gain'from the sight 8%) an accurate post to be rotatable about a horizontal axisifor representation of the relation between the posi elevational aim adjustments of the gun carriage, tion of the target and the direction of gun battery a gun sight unit comprising in combination a gun ann. sight, a ‘gun sight frame supporting said sight It will be appreciated that the invention pro- 7 vides a gun mount device wherein the elevational and'azimuth aim adjustment axes are disposed whereby the latter is pivotable relative to said frame about a'?rst-horizontal axis, a trunnion at the outermost positions of the supporting 2.0 post mounted upon said frame portion at a'posi-_ tion substantially directly over the position of said central post and to be rotatable about a ver therefore maximum range of aim adjustments is tical axis, said trunnion post pivotally engaging available in all directions, while the gun mount said frame whereby the latter is pivotable relative supporting structure is of compact and struc turally rugged form whereby to be adapted to .25 to said trunnion post about a second horizontal axis offset from said ?rst horizontal axis, trans maintain the mounted guns in “steady” sup mission means interconnecting said trunnion post ported relation. Hence, accuracy of gun ?re and and said frame, second transmission means inter ease of operation of the battery is assured. As connecting said frame and said sight whereby indicated at I28 a gun battery enclosure in the form of a generally spherical wall structure may 30 pivotal movements of said frame relative to said trunnion post operate said second means to drive be conveniently carried by the magazine support said sight to pivot relative to said frame, motion ing frame work, and will thus cooperate with the transmitting means connecting said gun carriage adjacent wall structures of the mounting vehicle bracket‘devices oflthekmounting vehicle, and that to said frame for pivoting the latter about said structure terminating in a hemispherical turret 35 second horizontal axis relative to said trunnion to provide a smoothly faired or streamlined portion protruding beyond the rearmost limit of the mounting vehicle. post coincidentally with the pivoting of said gun Although only one form of the invention has connecting said central post and said trunnion carriage, and motion transmitting means inter post for rotating the latter about its vertical axis been shown and described in detail it will be ap parent to those skilled in the art that the inven— 40 coincidentally with rotations of said gun carriage about the vertical axis of said central post. tion is not so limited but that various changes 3. In combination, a gun battery comprising a may be made therein without departing from the spirit of the invention or the scope of the ap pended claims. I claim: gun mounted on a carriage, a central post mount ed upon a ?xed frame portion, said central post mounting said carriage and rotatable therewith about a vertical axis for azimuthal aim adjust ments of the gun carriage, a shaft mounting said central post to be rotatable about a horizontal ?xed frame porition, said post mounting said car axis for elevational aim adjustments of the gun riage and rotatable therewith about a vertical axis for azimuthal aim adjustments of the gun 50 mount, a gun sight unit comprising in combina tion a bracket carrying a gun sight, a gun sight carriage, a shaft mounted upon said post to be frame supporting said bracket whereby the latter rotatable about a horizontal axis for elevational is pivotable relative to said frame about a ?rst aim adjustments of the gun mount, a gun sight horizontal axis, a trunnion post engaging said unit comprising in combination, a bracket 1. In combination, a gun mount comprising a gun carriage, a central post mounted upon a adapted to carry a gun sight device, a gun sight , frame supporting said bracket whereby the latter is pivotable relative to said frame about a ?rst horizontal axis, a trunnion post mounted upon frame whereby the latter is pivotable relative to said trunnion post about a second horizontal axis offset from said ?rst horizontal axis, gear means interconnecting. said trunnion post and said frame, second gear means interconnecting said said frame portion to be rotatable about a vertical axis and pivotally engaging said frame whereby 60 frame and said bracket whereby pivotal move ments of said frame relative to said trunnion post the latter is pivotable relative to said trunnion operate said second gear means to drive said post about a second horizontal axis o?set from bracket to pivot relative to said frame, motion said ?rst horizontal axis, gear means intercon transmitting means connecting said gun carriage necting said trunnion post and said frame, sec ond gear means interconnecting said frame and 65 to said frame for pivoting the latter relative to said trunnion post about said second horizontal said bracket whereby pivotal movements of said axis coincidentally with elevational pivoting of frame relative to said trunnion post about said said gun carriage, motion transmitting means in second horizontal axis operate said second gear terconnecting said central post and said trunnion means to drive said bracket to pivot relative to said frame about said ?rst horizontal axis, mo 70 post for rotating the latter about its vertical axis coincidentally with rotations of said gun mount tion transmitting means connecting said gun car carriage about the vertical axis of said central riage to said trunnion post for pivoting said post, motor means for driving said carriage to frame about said second horizontal axis coin rotate relative to said central post and said cen cidentally with the elevational aim adjustment of said gun carriage, and motion transmitting 75 tral post to rotate relative to said frame portion, 7 2&1251109 '8 and control means for said motor means, carried by said frame portion at position clear of the Orbit of swing of Said gun battery and closely adjacent thereto whereby an operator may peer second horizontalaxis offset vfrornsaid ?rst heri zontal axis, a trunnion post pivotally carried-bi! said yoke and having its axis coincident with the yoke axis, gear means interconnecting said trun nion post and said frame, second gear means inj terconnecting saidyoke and said bracket whereby pivotal movements of said frame relative to said trunnion post about said second horizontal axis through said sight and manipulate said control means while being positionedclear, of said battery. 4. In combination, a ‘gun mount comprising a gun carriage, a central post mounted upon ‘a ?xed frame'portion, said post mounting said car riage and rotatable therewith about a vertical operate said second gear means to drive said 10 axis for azimuthal aim adjustments of the gun carriage, a shaft mounted upon said post to' be rotatable about a horizontal axis for elevational aim adjustments of the gun mount‘, a ‘gun sight unit comprising in combination, a bracket adapte ed totcarry a gun sight device, a gun sight frame supporting Said braqket whereby the latter is pivotable relative to said vframeabout a ?rst‘hori zontal axis, a yoke, carriedby said frame portion and pivotable about a vertical axis, said frame being, pivotally attached to said yoke about a 15 bracket to pivot relative to said frame about said ?rst horizontal axis, motion transmitting means connecting said guncarriage to said trunnion post for pivoting said frame about said second horizontal axis coincidentally with the elevational aim adjustment of said gun carriage, and motion transmitting means interconnecting said central post and said yoke ‘for rotating the latter about its vertical axis coincidentally with the rotations of said gun mount carriage about the vertical 20 axis of said central post. ' JOHN C. TROTTER.