Owen sub machine gun patent

8/13/2019 Owen sub machine gun patent

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with the said bolt as distinct from the strik-ing pin method seen in Figures 1,

2,3

and4. In this illustration also the extractor hase- n removed.

Figure 6 is an end elevaticnal view ofthe form of breech bolt seen in Figure 5looking towards the left thereof.

Figure 7 is an enlarged detail view ofthe sear and trigger mecha;ism in thecocked position,.with the fire control device

in burst fire position and illustrating themodified form of the invention using thebreech bolt of Figures 5 and 6.

Figure 8 is a detail view illustrating thelocking plate provided to secure the searpin, the trigger pin and the fire controlshaft in the trigger housing.

Figure 9 is a detail view of the triggerhousing seen on the opposite side to thatseen in Figure S showing the fire controlthumb piece in the position it would occupyfor a burst of shots.

Figure 10 is a diagrammatic view illus-trating the position of th6 fire controldevice, the trigger, and the sear when thegun is cocked and at the instant the triggerhas been drawn back to release the breech

bolt to fire a single shot.Figure 11 is a diagrammatic view illus-i h iti f th fire control

from the recess 26 in the barrel 20 against

the action of spring 29 when it is desiredto remove the barrel 20 from the body 24 .A fore grip 30 is shown secured to thebarrel 20 by a bolt 31.

It will be appreciated that the barreland the tapered portion 32 provided forengaging the tapered socket 23 of the bodymay be formed as an integral part, or thesaid barrel 20 may he fitted into a sleeveportion 33 adapted to engage the taperedsocket 23 of the body 24 as illustrated inFigure 1 which also shows the foregripsecured to the said sleeve portion.

The said body 24 which is of tubularconstruction ha. an end cover 34 at theopposite end thereof to the tapered socket23 provided to receive the barrel 20. Abody plug 35 engages a shoulder 36 in thebody and is held therein by a bolt 37, whichalso secures the rear part of the triggerhousing 38 to the body 24; the forward partof the said housing 38 has a lug 39 whichenters a slotted projection 40 on the saidbody 24.

The trigger housing which receives a

trigger 41 a sear 42 and a fire control device43, as illustrated comprises a top strap 44 ,a bottom strap 45 and two side plates 46,


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pin 102 a trigger spring 105 being provided

S to bring the trigger 41 to its normal posi-tion, seen in Figures 1, 2 and 7 when thefiring finger of the marksman is removedtherefrom. The rear or sear engaging por-tion of the trigger is provided with a trig-ger stop 106, a trigger channel 107 adaptedto receive the sear tongue 97, said triggerchannel 107 having a lower channel face

010 8 . The trigger al.o has an inclinedStrigger face 109 and a projection 110 havingan upper projection face 111. The upperedge 112 of the trigger 41 is adapted toengage the fire control device 43.

The fire control device 43 as illustrated ismounted in the side plates 46 and 47, seeFigures 8 and 9 of the trigger housing 38said control device having three faces 113,114 and 115 capable of being engaged bythe upper edge 112 of the trigger 41, eachof the said faces being formed at a differentdistance from the centre of the said control

S device, 43 so as to permit of two differentmovements of the trigger necessary for fir-ing a single shot, or a burst of shots respec-tively, and provide a third position forlocking the trigger 41 against movement

which would result in accidental operation.The fire control device 43 is operated by

0 th b i 116 hi h i h i Figure

Figure 10. It will be observed that the edge

112 of the trigger engages the face 113 ofthe fire control device 43. which as statedhas been placed iii the appropriate positionby the thumb piece 116. The act of draw-ing the trigger backwards to .the positionFigure 10 causes the latter to turn upon thetrigger pin 102 and in so doing the lowerface 108 of the trigger channel 107 owingto engagement with the intermediate face100 of the scar 42 raies the forward endof the latter about the ear pivot pin 93with the result that the breech bolt 61 isreleased from the sear 42 and moves for-ward under the action of the main spring72. It will be noted that in this singleslhot position the trigger projection 110 doenot engage the lower sear face 101. Th erelea e of the breech bolt 61 by the sear 42takes place just prior to the separation ofthe face- 108 and 100, in which positionthey are seen in Figure 10. During theforward movement of the breech bolt 61 ineither of tle forms seen in Figures 3 oreither one or other of the faces 80 of thebreech bolt depending upoli from whichof the two parallel banks of cartridges in

tlhe magazine 54 the cartridge is being fed,engages a cartridge and moves it towardsth b h portion 120 of the barrel 20 of


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without the delayed action which is attend-ant upon the form of the breech bolt seenin Figures 1, 2, 3 and 4. The force of theexplosion in either case causes the bullet toleave the barrel 20 and the cartridge caseto rebound sufficiently to initiate the returnstroke of the breech bolt 61 against theaction of its spring 72. In the initial stageof the return stroke of the breech bolt 61the empty cartridge case is held by tlhe

hooked portion 86 of the extractor 84 untila projection 121 on the magazine 54, whichis adapted to project into the groove 78 inthe breech bolt 61 in its forward positionengages the head of the empty cartridge casespins the cartridge case downwardly andoutwardly, about the hooked portion 86 ofthe extractor 84 as a centre, through theejection slot 57 in the body 24. The breechiolt 61 continues its return stroke until itis snubbed out either by the main spring 72or by engagement with the plug 35. In thecase of the breech bolt Figures 1, 2, 3 and 4,the striking pin 88 is free to snub out onthe main spring 72 due to the head 90 ofthe said pin 88 engaging the head 75 ofthe cocking bolt 60. This reduces impact

on the breech bolt pin 63. In the case ofthe form of breech bolt seen in Figures 5,6 and 7 provision for snubbing the firing

ment and the toigue 97 to enter the channel107 is permitted by the mounting

of thetrigger pin 102 in the elongated slot 103and by providing the pivot spring 104. Onthe conclusion of the above operation thegun is ready to fire another single shot.

If, however, it is desired to now fire aburst of shots the fire control thumb piece116 is moved to a position seen in Figure11. to bring the face 114 into a positionwhere it will be engaged by the upper edge112 of the trigger 41 when the latter isdrawn back by the marksman and assumesthe position seen in the said Figure 11.The cocking handle 65 is drawn back tocock the gun if it has not already beencocked by a previous hot or burst of shots.On the trigger 41 being drawn back to theposition, Figure 11

andheld

in that posi-tion the following sequence of events takesplace; the trigger end of the sear is liftedby the engagement of trigger face 108 withsear face 100 which separate, and the triggerprojection face 111 engages the lower searface 101 and prevents the sear 42 fromreturning to a position where it may be re-engaged by the breech bolt 61, until the

desired burst of shots has been fired andthe trigger 41 released. In the case of ab f h h i f h b h


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18. Improvements in automatic firearmsas claimed in Claim 14. characterised in

that the fire control means is engaged bythe trigger and prevents the latter frombeing operated when the said means is in aposition of adjustment for preventing acci-dental release of the sear. ProvisionalSpecification No. 2237 of 22n1 d July. 1941.

19. Improvements in automatic firearmssubstantially as described and as illustratedwith reference to Figures 1, 2, 3, 4, 10, 11and 12 of the accompanying dr'awings.IProvisional Specification No. 2237 of 22nd'fuly, 1941.

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20. Imp)rovements in automatic firearmssubstantially as described and as illustrated

with reference to Figures 5, 6 and 7 of theaccompanying drawings. ProvisionalSpecification No. 3948 of 18th December,1941.

Dated this 25th day of March, 1942.

EVELYN ERNEST O W E N .

By his Patent Attorneys,EDWD. WATERS SONs. 1

Fellows Institute of Patent Attorneysof Australia.

Witnes--J . E. Wells.

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Owen sub machine gun patent