Nov. 12, 1946. E. A. B. RICE ET AL. 2,411,114 GUN MOUNTING Filed oct. l5, 1941 4 Sheets-Shee’r. l Y l 1 " l mi QLL INVENTORZ E.A.B. RICE. AG. ROSE. 5.CURTIS- ’ ATTORNEYS. Nov. 12, 1946. E. A. B. RICE ET A1. 2,4l1,114 GUN MOUNTING Filed Oct. 15, 1941 4 Sheets-Sheet 2 _l Q3äà wvQwm lNVENTOR E.A.B.R|CE. AGROSE. BY : l SCURTIS'. j / ATTORNEYS. Nov. 12, 1946. E. A. B. RICE ET A1; 2,411,114 GUN MOUNTING Filed Oct. l5, 1941 4 Sheets-Sheet 3 FIC-3.3. INVENTQR; E.A.B. RICE. . A.G.Ros|-:. . s. CURTIS . BY Í í/í A’T’TORNEYS Nov. 12, 1946. E. A. B. RICE ET AL 2,431,114 ‘ GUN MOUNTING Filed ost. _15, >1941 4 Sheets-Sheet 4 FIGA. l 47 4e 48 m \79 83 INVENTORI E.A.B. RICE. A.G,F\OSE. S. CURTIS. BY 7m ATTORNEYS Patented Nov. l2, 1945 UNITEDSTATES PATENT ortica v 2,411,114 GUN MOUNTING Edward Arthur Beckton Rice, Newton Abbot, and ' Alfred German Rose and Sidney Curtis, Gains borough, England; said Rose and said Curtis assignors to Rose Brothers (Gainsborough) Limited, Gainsborough, England, a company of Great Britain l Application October 15, 1941, Serial No. 415,028 In Great Britain October 24, 1940 7 Claims. (Cl. Sil-37.5) 2 This invention relates to gun mountings of cording to the invention, shown in position in the type in which the gun or gun assembly is mounted on a carriage arranged for movement along a track. It is an object of the present invention to pro vide a gun mounting of this type in which the »gun carriage can be quickly moved from one the fuselage of an aeroplane, Figure 2 is a part sectional end elevation of the mounting, drawn to a larger scale than Fig ure 1, as viewed from the right of Figure 1, the carriage being deemed to fbe in a central posi tion on the track, Figure 3 is a plan view of the carriage, drawn to a larger scale than Figures 1 and 2, with the position to another along the track Without dis tracting the attention of the operator from the target and without the need for much exertion l0 on the part of the operator. upper structure removed, f Y Figure 4 is a part sectional elevation taken on the line 4-4 in Figure 3, with a portion of the According to the present invention, there is upper structure removed, and» ' . ~ provided a gun mounting of the type described Fig. 5 is a diagram illustrating the construction wherein the carriage is arranged to be driven ` along the track by a, rotatable driving member 15 of the track. Referring to the drawings, a track generally mounted in the carriage and engaging the track, indicated by reference numeral II is mounted in driving means being provided on the carriage for the fuselage l2 of an aeroplane by means of sup bringing labout rotation of the driving member, porting brackets I3, attached to a platform IllV in and wherein the starting and >stopping of the driving means is controlled by a pair of control 20 the fuselage, and a bracket I6 attached to a ling members one of which is adapted upon oper ation to cause the driving means to rotate in one direction and the other to cause the driving shield I'I which is itself mounted on the platform I4 by means of a bracket I8. The track II con sists of a straight portion a, extending trans gun assembly. to the invention enables a gun or guns to be The track II has a cross-section of channel shape and is disposed with the flanges I9 of the section horizontal and the Web-2| of the section on the manual operation of control means on the gun Supported on rollers 22 arranged to run on versely of the fuselage I2, and two arcuate por means to rotate in the opposite direction. Con veniently, the controlling members are adapted 25 tions b merging into the straight portion a and extending towards the front of the aeroplane. for attachment to the hand grip of the gun or More speciñcally, the gun mounting according swung in azimuth in opposite directions by the 30 insid_e of the track. the faces of the ñanges I9 is a gun carriage 23 attached to the top of which is a gun supporting Conveniently, the motor is mounted on the pillar 24 which is formed at its upper extremity carriage in such a manner that, in the' event of failure of the motor to drive the pinion for any 35 with a split bearing 26, 21 adapted to carry a gun assembly consisting of a pair of machine reason, e. g. a discharged battery, the motor can guns 28. The portion 26 of the bearing 26, 21 be quickly disconnected from the pinion, leaving is hinged on the pillar 24 at 29 for easy re the carriage free to be moved along the track moval of the gun assembly, a quick-release pin by hand. Thus, the motor may be carried on 40 3l being provided for locking the two parts of a bracket pivoted on the carriage and provided the bearing together. with a spring tending to cause the bracket to The gun carriage 23 embraces the track I I and swing away from the carriage to disconnect the is guided on the track by a pair of rollers 32 motor from the pinion, the bracket being nor and tWo pairs of rollers 33. The rollers 32 are mally locked in position against the action of the 45 arranged to bear against the face of the web 2| spring by a spring-loaded locking pin passing of the track II (see particularly Figure 4), one through the bracket into the carriage and re-` towards the top of the track and the other to leased by pulling out the pin. wards the bottom, and are freely mounted‘on a The invention is particularly useful in its ap vertical shaft 34 rotatably supported in bearings plication to gun mountîngs for aircraft, armoured 36 housed in the upper and -loWer wallsofthe cars and the like, and, by way of example, such carriage. The rollers 33 are varranged to bear an application of the invention will now be de against the vertical faces of the flanges I9 of scribed in greater detail, with reference to the the track I I, the upper pair being freely mounted accompanying drawings in which: on studs 31 attached to the upper wall of the Figure 1 is a plan view of a gun mounting lac 55 carriage 23 at positions one on each side of the or guns. 4 ¿i axis of the rollers 32 (considered in the direction of travel of the carriage), while the lower pair carriage 23 is shown in this position by chain dotted lines. The profile of the cam surface 39 is such that the rollers 33 and the roller 32 con tinue simultaneously to bear on the track I I dur ing the passage of -the carriage 23 from the are freely mounted on studs 38 attached to the lower wall of the carriage at positions coaxial with the studs 31. The face of the web 2l of the track II and the vertical faces of the flanges I9 of the track thus act as guiding surfaces for the carriage 23 and the width of the track Ii, i. e. the distance between the face of the web 2i and the vertical faces of the flanges i3, is such as -to provide just sufficient clearance between Vthe ytrack II andthe rollers 32 and 33 for easy running. ~It will be understood that the width of the track ii is greater on the arcuate portions b than on the straight portion a to the arcuate portion b and Vice versa. With this construction, the rollers 33 and the roller 32 are disposed so as to provide rigid sup -port for the carriage at any position on the track while, at -the same time, the carriage can be freely moved along the track. Secured to the central grooved portion of the shaft 34 is a pinion 4I arranged to mesh with a rack 42 secured to the central portion of the web '2l of the `track II. The portions of the rack straight portion a because of the ytriangular dis position of the rollers 32 and 33 as viewed in corresponding t0 the straight portion a and the arcuate portions b of the track i I each have teeth of a standard form except on the portions corre sponding to the cam surfaces 39 where, it will be plan. At the junctions of the straight portion a and »the arcuate portions b of 'the track II, the face of the web 2| is provided> with a cam surface 39, understood, `the teeth have to be slightly modi fied in shape so as to allow smooth operation be the purpose of which ’is -to ensure that Vthe `roll ers v32 and 33 continue simultaneously to bear on tween the rack 42 and the pinion 4i .during‘the the >track II during the passage of the carriage .23 from the straight >portion a to the arcuate portions b and vice versa. The construction of the track -II is shown in Figure 5 and since the arcuate portions Vb merge into the ends of the straight portion a in-an iden tical manner, it will be sufficient -to 'describe >the 30 passage of the carriage from the arcuate por tions b to the straight portion a and Vice Versa. The shaft 34 protrudes through the bottom wall of the carriage 23 and has secured to its protrud ing grooved end a driving ñange 43 which is ar ranged t0 be driven by an annular wormwheel 44 through a pair of flanged gripper members 45 in a manner which will'be described later. The merging of one of 'the arcuate portions vbintlofthe wormwheel 44 is arranged to'be driven by a'worm straight portion a. 46 secured to a shaft 4-1 supported in bearings 43 The outer surface of the arcuate portion b of „carried by a bracket 49 pivotally attached at _50 the track II, i. e., the path followed 'by the Ver tical faces of the flanges I9, follows an ,arc struck 35 to a'bracket `5I secured to the carriage -23. >Stops 52, ‘having inclined abutment surfaces, are formed from a'point o until itfmeets the-outer >surface on Ythe bracket Y49 Vto -prevent excessive -pivotal of the straight portion a at av point »in a line >movement thereof, the vabutment surfaces nor o_o, 'theline o_o being disposed-normal to the mally being clear’of the carriage 23 byl an amount straight portion a of the track and passing through the'point o. lThe straightportion a'o'f the 40 sufficient to allow adequate pivotal movement of the bracket ‘49. The worm 46 is driven from an track thencontinues as a tangent to the -outer electric motor 53, 'attached to >the bracket -4'9 surface of the arcuate portion b. vThe yinner sur through gears 54, 55 and155,~t‘he~gear~54 being face of the arcuate portion b of the track VII, secured tothe armatureshaft '51 of the motor i. e., the face of the web 2l, also follows an arc struck from the point o luntil it meets >a radial 45 53,-the gear 55'being freely mounted on ay studi-58 carried by the «bracket‘49 and the gear «56 being line o--c, and then continues as a compensat secured to the worm shaft 41. :ing cam surface `39 yuntil it meets the inner .sur TheV annular wormwheel v44fis formed with an face of the straight portion'a at a point "in a Vinterna-1l surface »which tapers from v`a rmaximum line d-d running parallel with the -line o_o. The inner surface of the straight portionva then 50 diameter at "the outside‘edges of the‘annulus `to a minimum diameter midway in the >`width'of'the >continues on a path parallel to that followedfby annulus (see Figure 4) , and is supported- on the the outer face of the straight portion a. flanged gripper members 45th@ `flanges of which It will .thus be seen that the compensating cam surface 39 extends on each side of the’line .o-o. The length of the cam surface '39 and its disposi are shaped'soas to mate with »the internal nsur 55 face of the wormwheel 44. The gripper Vmem bers l45 Vare squeezed-towards each' other lto' grip the internal surfaceof thewormwheel ï44 lby a series ofsprings 59 supported on studs G-I `passing freely through lthe gripper members 45 and the moving from left to right, it will be seen from the two positions of the carriage 23 shown in `Figure 60 drivingflange`43. The upper gripper member 45 ‘is secured to the driving ñange ‘43 vby a series `of 5, that the cam surface 39 extends to the‘left of driving bolts~62 >the heads of which pass through line o-o‘by an amount such that when the centre tion in relation to the line o-o depends :on the relative dispositions of the roller 32 and the roll ers 33. Thus, assuming'the carriagel 23 to be the lower-gripper .member 45. The `pressure ex of the forward roller 33 lies on the line o---o, and lthe roller is thus at the junction of the straight and arcuate portions of the track I'I, the centre of the roller 32 lies on the line d-d and is thus about to come under the influence of the cam . surface 39; The carriage 23 is shown in this posi tion by full lines. The full length‘of the »cam 'surface 39 is such that when the centre vof the rearward roller 33 lies on the line-‘o-o, and the carriage as a wholeis'thus about’tov move'on to the arcuate portion'b of the track, the centre of 65 erted by the springs' 59 is adjustable by means of nuts 63 for the purpose of varying vthe gripping pressure between the gripper members -45 `and the wormwheel 44. ' Y With the above construction,it will beseen that the wormwheel -44 andthe gripper members 45 constitute a slipping clutch mechanism which will prevent damage to the apparatus in the - event that the motor 53 iskept running longA enoughto cause the carriage v23 to strike the Y supporting `brackets I3 at the ends of thetrack I-I ,the worm the-roller 32 >lies on the radial line o-c Vand 'is thus about to leave the cam surface 39. The 75 Wheel 44, in such an event, merely slipping round 12,411,114: E _the recess 1I in the carriage 23,'whereupon the bracket '49,* together with the moto'rf53 and its associated gearing," is caused to-«swing'outwardly `the gripper members 45 against the action ofthe springs 59. , , , , A " Asmentioned above, therbracket '49 is pivoted at 50 and carries the motor 53 withits -gear 54, the intermediate gear 55, and the worni 46 with' its gear .56. It will be seen, therefore, that when the-bracket 48 is swung awayfroni the carriage 23 `the worm- 46 is caused to 'disengag'eßfrom the wormwheel 44 and thusdisconnect the ~driveïfrorn the motor-53 to the pinion 4I.~ A leaf spring 66«is attached to the carriage 23 and is caused'to exert aspring pressure against the bracket 49 when- it is inthe operative position, as shown in Figure 4, so lthatfthe bracket 49 is continuously urgedto swing outwardly. ` > ' i In order to'lock the bracket 49 in its operative >position against the action of the spring 66, there is provided a plunger 61 which ishoused in a bearing 68 attached to a lug 69 extending from the bracket 49 and lying adjacent an end >of the vertical wall of the carriage. The plungerv 61 un'derthe action of the spring‘- 66.' to-¿disconne'ct Ui the worm 46 from v'the'wormv'vheel~44. =The car riage`23 is then free to b'e moved along the track by» hand(r When the mounting is beingused- in this manner, the carriage Y23 may be locked atany given position along the track I I by pushing the bracket 49 towards» the carriage untilthe plunger 61 snaps back into locking position when the worm 46 byî its engagement with the lwormwheel 44 effectively locks the carriage against movement along the track. A hand knob 83 is attached to the armature'shaft 51 of the motor at the oppo site end to the gearf54 for the purpose of turning the armature shaft» slightly in case the worm 46 does not properly engage the wormwheel 44 when the bracket 49 is sw- ng back into operative posi tion. We 7 claim: Y , -' _ n -» > A 1. A gun mounting comprising a- track,`a` gun passes through the lug 46i into a recess 1I »in the carriage movably supported on the track and _ar carriage and the bearing 68 is formed with a ranged to carry a pair of guns, vmeans von said recess 12 for the accommodation of a spring 13 disposed around the shank 14 ofthe plunger 61 25 carriage for guiding it along the track, the track being formed with _a rack extending along'v its and bearing at one end against the >plunger G1 length, a rotatable pinion mounted in said-car and at the other end against the base of thel re riage and arranged to engage the rack, a revers cess` 12. The shank 14 protrudes through the ible electric >motor mounted on said -carriage in bearing 68 and has secured to itsend by means of a pin 16 a. knob 11 in_which isgsecured a pin 18 30 driving - connection” withfsaid pinion,` said vmctor being> carried on a bracket pivoted’on said ca‘r to facilitate handling.VA ' ~ o ' riage, spring means tending >to cause said bracket In order to counteract any twisting moment in to swing away from said carriage so as to dis the carriage 23 arising from the disposition of connect said motor from said pinion, a, spring the motor 53 and its associated gearing in rela loaded locking pin arranged to pass through said tion to the track I I, there is secured to the lower bracket into said carriage so as to lock said wall of the carriage 23 an arm 19, suitably re bracket in its operative position against the action cessed for the accommodation of the wormwheel of said spring means, and a pair of switches ar 44 and its associated parts, provided at its ex ranged to connect said motor with a source of tremity remote from the carriage .23 with a roller 8l freely mounted on a stud 82 secure-d to the arm 40 electric power, e. g., a battery, in such a manner that one switch is capable of bringing about ro 19, the roller BI being arranged to bear against tation of said motor in one direction and the an auxiliary track 83 secured to the platform I4 other is capable of bringing about rotation of said by means of bolts 84. motor in the opposite direction, said switches be The motor 53 is of the reversible type and is ing adapted for attachment one to the hand grip connected to an electric battery (not shown) of each of said guns. through a pair of contactor starters (not shown) 2. A gun mounting comprising a, track of the and a pair of thumb switches 86 and S1 attached kind in which portions having different paths one to the hand grip of each of the pair of ma merge into each other, said track being formed chine guns .28, the electrical connections being such that the switch 85 causes the motor 53 to 50 with two opposing carriage-guiding surfaces, a gun carriage movably supported on said track and rotate in the direction necessary to drive the car arranged to engage said guiding surfaces at at riage 23 from right to left (as viewed in Figure least three points simultaneously, at least two of 1) and the switch 81 causes the motor to rotate in said points being on one of said surfaces and the the opposite direction to drive the carriage from remaining point or points being on the opposing left to right. surface, at least one of said surfaces being formed It will be seen that, to move the carriage 23 on at least one merging portion of the track with from one position to another on the track I I, it is at least one compensating cam surface against only necessary for the operator to depress one which a surface-contacting point on said car or the other of the switches 86 or 81, depending on the 'direction in which it is desired to move the 60 riage bears, during passage of said carriage over said merging portion of said track, to cause said carriage, whereupon the motor 53 is caused to carriage to continue to bear on said track at said rotate in the appropriate direction and drives the pinion 4I through the gears 54, 55 and 56, the worm 46 and the wormwheel 44, the pinion 4I, in turn, rolling along the rack 42 to drive the carriage 23 along the'track Il. The pivotal mounting of the bracket 49 allows the drive to the pinion 4I to be disconnected at points. 3. A gun mounting comprising a track the path of which comprises a straight portion and a curved portion merging into each other, said track being formed with opposing outer and inner carriage-guiding surfaces, a gun carriage mov ably supported on said track and arranged to will so that, should the necessity arise, the car riage 23 can be freed for movement along the 70 carry a pair of guns, guiding means on said car riage arranged to engage said surfaces at three track Il by hand operation. Thus, in the event points simultaneously for guiding said carriage of failure of the motor 53 to drive the pinion 4I along said track, two of 'said points being on said for any reason, it is only necessary for the oper outer surface and the remaining point being on ator to withdraw the knob 11 against the action of the spring 13 until the plunger 61 is clear of 75 said inner surface, said inner surface being pro “2,41 1, 1 114 7 ,videdon the mergingportion .of _said track with acompensating cam surface againstwhichfone Vof the :carriage-,guiding ymeans is arranged to î'bear during passage of said »carriage yover said Yper 8 »the'track-to cause the movement of said `.carriage along the track. 6. A gun mounting comprising a track, a ygun carriage movably supported Von the track,v means on said carriage for guiding it along .the track, a .tionof said track to cause said ¿carriage to'con tinue lto bear at -said Vthree points, a rack ex tending along the ¿length of _said "track, „and a rotatable pinion Ymounted 'insaid carriage >and rotatable driving member mounted in said car riage and arranged .to engage the vtrack .so asto `cause said carriage to move along'the track, driv arranged »to engage said-rack. ing means mountedon said carriage and arranged Y .4. A gun mounting including -a ,-track, a gun 10 to »bring about rotation Aof said driving mem carriage having _guidedymovement fon Said track, `driven means on said vcarriage contacting _said track to cause `the movement ,of Athe -.c„arriag_e, a bracket -connected with said carri-age for move ment to an active position or aninactiveposition, and driving means on said ‘bracket which coop erates with said driven means to drive the latter to move vthe carriage when ¿thebracket is «in the active position, said driving means being disen gaged from said driven means when the bracket is in its inactive position. l ~ 5. A gun mounting including a track, a gun carriage constructed and arranged to move` along said track, rollers on said .carriage rotatable on vertical axes respectively invrolling contact Vwith opposite sides respectively of said track, other rollers >on said carriage >rotatable on horizontal ber, said driving means beingcarried on a-bracket -pivoted `on said carriage, :spring means tending to cause said bracket to swing away fromïthecar riage, so as to disconnect the driving .means »from the driving member, means formaintaining said bracket in the driving position, Vmeans for >releas ing vsaid bracket so las Lto allow it to swing away from the carriage under the inñuence .of `the spring, and a pair of controlling members fin ycon nection-with said driving means, one of the con trolling members being arranged upon voperation to cause the driving means to vrotate in one direc tion andthe other-to cause the driving means »to rotate in the opposition direction. 7. A gun mounting according to claim 6, in cluding a ñxed stop arranged to limit the extent of the pivotal movement of said bracket under the Aaxes respectively in rolling contact with upper inñuence of sai-d spring. ` surfaces of said track respectively, a driven shaft `EDWARD ARTHUR BECKTON RICE. > providing the axle for certainof said rollers, and 30 rALFRED GERMAN ROSE. means on the shaft which coacts with means on SIDNEY CURTIS.