US817198A - Gas-operated firearm. - Google Patents

Description

6 0 9 1 0 l R P A D E T N E T A P um T I M S R M am 9 1 7 1 8 0 N GAS OPERATED FIREARM. APPLICATION FILED 11.27. 1904.

10 SHEETS-SHEET 1.

INVENTOR A TTORNE Y3 WITNESSES.-

R5 817,198. PATENTBD APR. 10, 1906.

- I M. RSMITH.

GAS OPERATED FIREARM.

APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 2.

lNV ENTOR.

A TTORNE Y5 r I I llllirllflmrllrl llllt PATENTED APR. 10, 1906.

M. F. SMITH. GAS OPERATED FIREARM.

APPLIOATION FILED 11.21. 1904.

10 SHEBTSSHEET 3.

11V VEN TOR.

m w A n W ATTORNEYS PATENTED APR. 10, 1906.

M. F. SMITH. GAS OPERATED FIREARM.

APPLICATION FILED 11.21. 1904.

mw m.

PATENTED APR. 10, 1906.

' M. F. SMITH. GAS OPERATED FIREARM. APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 5.

JNVENTOR. m 211M 3x752 A TT RNE Y's PATENTED APR. 10,- 1906,

M. F. SMITH. GAS OPERATED FIREARM. APPLICATION FILED APR.27. 1904.

INVENTOR. b M m/ 10 SHEETSSHEET 6.

A TTORNEYfi No. 817.198. PATENTED APRJO, 1906. M. F. SMITH. GAS OPERATED FIREARM.

APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 7.

" JNVENTOR.

W MM I x /v\......

{ y M. E. SMITH. I GAS OPERATED FIREARM.

} APPLICATION FILED APR.27. 1904.

PATENTED APR. 10, 1906.

10 SHEETS-SHEBT 8.

W1 TNESSES: JNVENTOgK PATENTED APR. l0 1906.

M. F. SMITH.

GAS OPERATED FIREARM.

APPLICATION FILED APR,27.1904.

10 SHEETS-SHEET 9.

INVENTORI W find M WITNESSES A TTORNEYS.

PATENTED APR. 10, 1906.

11. SMITH. GAS OPERATED FIREARM. APPLICATION FILED APR.27. 1904.

10 SHEETS-SHEET 1o.

I I 4.14m

Attorney! I i Thrall iuhom tt concern.

' Be it known .thatI, MoRRIs FonD'SMITH, 'a

cation;

I and cushioning the breech-bolt.

v are applicable to firearms in general, they are through the receiver portion of the gun, wit h Philadelphia, in {the 'county'of Philadelphia certain new and useful Improvements in Firearms, of the following isa specifiing the breech-bolt,.manually operating the my invention will "be illustrated and de- 25 shoulder-arm.

ngs in wlnch- Fi ii'F-ED S. rt-Ii? fifi'iiliihi i @FFICE.

ITHREE-FOURTHS TO WILLIAM l).

CONDl'i, OF DES MOINES, IOl/VA.

GAS-OPERATED FIREARM.

c'itizen of the ,United States, and a resident of and State of Pennsylvania, have invented l'lhisfiinifention has for its obj ectto provide an improved means for mounting the trigger,

sear against movement, locking and operatbreech-bolt and holding it in an open position,

Other objects and advantages will appear in the following description and'will be particularly pointed out in the appended claims. i

While some of the features of my invention designedf more particularly in connection with firearms of the gas-operated type, and

scribed in connection with a gas-operated My invention consists in. certain novel features of construction and combinations of features to be hereinafter fully described, and particularly pointed out in the claims, refer ence being had to the accompanying drawfigure! is a side view of a military rifle embodying the several features of my present invention. Fig. 2 is an enlarged vertical section in the plane of the axis of the barrel the firing-pin in cocked position and the safety-catch engaging the sear to prevent the release of the firing-pin, some of the working parts being shown in elevation. Fig. 3 is a view similar to Fig. 2 in which the safet vcatch has been withdrawn from beneath the scar and the trigger has been pulled and the firing-pin projected against the primer. Fig.

4 is a view similar to Figs. 2 and 3, in which i the arts have been moved by the gas-open atet mechanism to the positions which they severally assume when the receiver is open, the spent shell having been thrown out and a new charge having been placed in position to be introduced into the chamber of the gun by the forward movement of the bl'QGCll-bolt.

' Specification of Letters Patent. Application filed April 27,1904. set-in No. 205.226.

Patented April 10, 1906.

Fig. 5 is a horizontal section. through the portion of the gun shown in Figs. 2 to 4 with the parts in positions corresponding to Fig. 3.

Fig. 6 is a vertical transverse section on the line 6 6, Figs.'3 and 12. Fig. 7 is a vertical transverse section on the line 7 7, Fig. 4. Fig. 8 is a vertical transverse section on the line 8 8, Fig. 3. verse section on the line 9 9, Fig. 3.

Fig. 9 is .a vertical trans- Fig. 10

is a vertical transverse sect-ion on the line 10 10, Fig. 3. F ig.. 11. is a vertical transverse section on the line 11 11, Fig. 17. Fig. 12 is a side elevation of the portion of the gun shown in Figs. 2 to 5. Fig. 13 is a side elevation of the breech bolt and parts carried thereby, together with the connecting-rod which looks and unlocks the locking-bar and rcciprocates the breech-bolt. The connectingrod is at the rear limit of its movement rela-.

tive to the breech-bolt and consequently has drawn the locking-bar downward. Fig. 14 is a view similar to Fig. 13, in which the connecting-rod is at the forward limit of its movement relative to the breech-bolt. Fig. 15 is a vertical transverse section on the line 15 15, Fig. 13. verse section on the line 16 16, Fig. 14. Fig. 17 is a vertical longitudinal section of the forward portions of the gun on the line 17 17, Fig. 6; and Fig. 17 is a transverse section therethrough on line 17 17, Fig. 1.7. Fig. 18 is a vertical longitudinal section of'the forward end of the gun. Figs. 19 and 20 are transverse sectional views on the lines 19 19 and 20, Fig. 18, of the front band which connects the frame with the barrel. Fig. 21 is a perspective view of the stock of the gun with all wooden and movable parts removed. Fig. 22 is a sectional perspective showing the magazine locked against feeding. Fig. 23 is Fig. 1-6 is a vertical transconstruction and are hereinafter fully de-- scribed.

plate. I

In any type of gun it IS desirable to have 11 represents the magazine floor- I 21 is such that a hunted lndependent movethe brdech-bolt'limited to a single back -and-' l firing-pin and fitted to slide in the'rear end of forth movement andnot subject to any trans-' verse movement for locking and unlockin it; For. this reason my present invention emp oys" a breech-bolt 12, guided in its longitudinal movements between a track 13, formed by the to of-the frame 14, and atrack '15, ro-' vided y thetop of the receiver 3. To ock the breech-bolt m its forward or closed posi fiset 16, ,which-receivesthe rear en of a eking dog or' 17, fulcrumed by its bifnigcated forward end 18 on o posite sides of breech-boltg12 near the orward end of ove downward into a'recess 19, formed in' the upper portion of the breech-bolt, and has ment of'thelocking-bar with the breechbolt ceiver. The Wings 20 are rovided with camgrooves 21 m their outer aces, which receive pins 22 on the inner faces of a bifurcated operating or driverod 23, which extends forward and is connected to the gas-operated mechanism. The shape of the grooves 21 is such that the locking-bar 17 is moved into i the offset 16 by the forward movement of the operating-rod 23 and is drawn downwardly out said 0 set and into the recess 1 9 by the rearward movements of said operating-rod, these -movements being followed, respectively% by the 0 ening and. closing movements 0 the breec bolt. The shape of the grooves ment of. theoperating-rod 23 relative to'the breech-bolt is "permitted. This movement occurs-at the first part of the rearward movement of the operating-rod and at the last part of its forward movement, and during this relative movement the locking-.baris tion.

moved from and returned to its locked posi- The forward portions of the ooves 21 are of a 'very low pitch, so as to ve the operating-rod greater ower over the ockingbar to unlock and 100 it, while the rear portions of said grooves are of much greater itch to accelerate the movement of the 100 'ngbar after it is released from its seat. The

4 rear ends of said grooves are formed with approximatelvsermcircular recesses extending argely in front of the-carn-pins when they are in their rearmost position in the camgrooves, to provide substantial shoulders at such an le as to take nearly all the forward thrust o the operating-rod and avoid transmission of this'thrust u wardly to such an extent as would materia ly increase the friction on the upper track 15.

The firingpin has lat-longitudinal bore to receive the projecting spring 25', and this sprin abuts at its rear end against a bushing 26, te escoping over the open rear end of the tion, the receiver 3 is formed-with 'an u ward transmitted bly d bolt.. The locking-bar 17 isadapted to.

the breech-bolt and there secured by a pin 27. -LThe pm 27 engages the bushing 26 through a by the e a ement of the bushing with the rear end 0 t e receiver amen abutment and the absorpt on in the spr ng of the work t the breech-b0 t. initial compression by t e cookin of the fir ing-pin24, it follows 'thatwhen tile bushing "26 strikesthe'rear end of the receiver the sprin 25 must be further compressed by contmue rearward movement of the breechbolt' 12, and this wilLarrest the breech-bolt and tend to start it forward again by the time the-operating-rod is reversed in its movescribed. A

The cocking of the firingpin is accomplished by means of an additional pair of inwardly-extending integral projections 29 on the operatin -rod- '23, which work through slots 30 in t e sides of the breech-bolt and engage in front of the shoulder 31 of the firin -pm. This is especially advantageous, in that the firin -pin is cocked by the rearward movement 0 the operating-rod and is prevented from striking the primer until the operating-rod returns to its foremost limit again in the event of the failure of the sear to retain the firingin, and this renders premature fire impossi 1e.

.32 represents the sear which is retained b pins 33 on opposite sides of the frame andfu crumed by its bifurcated forward portion 33 in their hearings on opposite sides of the ejector-post 34, which is mounted in a dovetailed seat 35, and projecting upwardly works through a slot 36 in the breech-bolt and a slot 36, Figs. 15 and 16, in the enlargement 37, formed on the under side of the firing-pin to provide the shoulder for engagement with the sear. (See Fig. 7.) T e sear 32 is pressed normally upward by a s ring 38.

39 represents the trigger fulcrumed at 40 he i'earwand momentum of v T hes ring 25. being under ment by a return-spring, to be hereinafter de- \8 in a longitudinally-movable fulcrum-block 41,

which 15 pressed normally forward. by a s ring42 and having a T-head 43 (shown by otted lines in Fig. 3 and in plan in Fig. 5) in the ath of the operatingrod, so that when the reech-boltnears its rear limit it imparts rear movement to the fulcrum-block 41 and draws-the trigger 39 off the sear 32. This permits the sear to return under the action of its spring 38 to position for engagement with the firing-pin, so that the gun will remain cocked after each shot followed bv the automatic opening of the breech an introductlon of a new charge.

44 represents the trigger-spring.

, y 1-guard; wh1 1e=iiteis moved out lof ngage ent,

.' jguardie It' 1s heldin eithen ofiitspositionsby mean-set a at spr ng-53;fize eti re r endr 54and1-hwinga serrated front'e'nd- 55=ywhich jgether. ,a pivotal connection [at-the point e g i- 1, W 2 Tthe'fmme e -P positiom; the- 's 'r-L position-to e movediintdinga I t jg-Qifessing it "in-front 'of thegtrigger receives. a tooth"5610n the"s ide of the safety= -v snitablefdrm of magazine may-beem-I vertie allvibenath the receiver with'a 081E850.-

- 4o :fulcrumed at 57 andca l fu 1crumed ona lever 59, which-is inturn fulfnll'linesjin Figsliand 9.)! lfjflqydii I have shown; almagazine-located it'y-foi five' charge's-andha a cover 11,

' L' {crunied' at 60. on the'cover-andpressed up- Wardby as The crating-rod 23 is,.-'a"s state bifurcated an carries at its 4 -CrQS 1ead, which ositioned'l-below the barrel, .asuitable'pus 'on'," prefera blycomprising a dash-lpot .62, workm over afixed ,pliir-igerf63 -,-on the' -frame of t e gun.'-f-The si'd'e's of theoperatin'g-rod are"'pos1ti oned-onso ,the" sides of the magazine and are connected to theirJcross-head by fittingfin dovetailedilassm'g throngh them and f -jthroughthe crossead' is the-taper pin 65.

w i "66' represents the-gas-op'erated piston-rod;- '53 which "screws into the cross-head -.-z t-;67 and hasapointed end 68,,ewhich-enters .asea't 69 v in the taper pin'65 and prevents displacement;

-- ,:of m r- 70- re resents-the piston on theu-forward ;.'der71 and receives-gas-piiess r f pm th gun-barrel through a port"72 z;i()

, ,of accommodating 'asufliciently "longtsprin 1,gontthe barrelfthis-portfmis-formed-at a sui ble angle-mfthegunbarrel,isothat-it 'leave lam a i e lift 52 l &thf he,. 0 4 232., 0 the stock,-1s".,prov1de d wltha front plate 73 t t I aim -bifurc ated,x 'as shown; at 174, =to'f'permitthe wnwardly by the; er andathe eflforwai df; ortionvof gthe =.ti 'ig'gergsecket :7 5-, with a. spring-pressed etaining ges seen that, the=lever: 9; projects laterally 'catiililf- (See dotteii lines, Figs'. 2 andanda eed-table 58,,

to the material' reduction in thefl'en'gth of the barrel 75 110W P m Se v e-guns, the-necesfsity on] the one of'having the gas- -taken-- omthe barrel at a sufficient distance back from the muzzle and, on the other hand he borej' at fa point] considerably her t -e'nters the cylinder head 87; hisport isjof uniform d' V e 'i li' fi f 4. amped fin-,- asjitis essential-that t onducte at thelprejssurefwhich it"has nxth ore; 1 the piston material-2:

T ff 5mm 18,,hti151iaiti? he.

band itoxclamp mum the" stock and "havin' formed integral therewitha, bayonet or To from a longitudinally-sliding hand-retracting bar' or bolt 78, guidec l in a socket 79 on the sideof the receiver, the socket being jjiiovided "with an extensionp79", rovidingl a s udder operation by the gases.

79 --"-a tlits forward end,=1n front offwi' 'ch the lever 9 rests when the gunis iniconed ition for When itis desired'to o'p'en-tlh egljtreech. by; 7

hand, the lever 9i's elevated, there? fnoving it fromin frontof the shoulder-79?;- qscillatf,

.ing the retracting-bar and. causing an ecc"n'- 'trically-pivoted pin 801to enter arecess 81 in one of the side niexnh'ersof theoperating-rod 23, thus establishing a controlling connection with .the breech-bolt; v The pin 80 is pivoted IIO in the retracting-bolt by means of a small forwardly-extending trunnion 80 and a large rearwardl extending trunnion 80", the pe- 'r-iphery o the latter intersecting-the periph- The lever 9 is move A 80 has entered recess 81, the pin SO during "this-movement traveling in a slot 81?. in the =Qceiver.,:-'(See Figil; 5.) v :i grpThe stop 10 int ery of, the retracting-bolt, as shown in Fi'g. 9. rearwardly'after the pix);

. g5. ing' -'bolt str ets s v ral-warez. "rilevei'r 9-Zengagesjthe stop zit 'whic itnefof the artridge, rev fi the breech-bolt ogen, to clean the grin-or for'j est ' theection of; thereturnespring;F;If,;however,

fit'isideslired'toiextractthe shell and feed by v i -Khalid instead ofcfronithenragazine whe'n 'the r l megqzineisnot ein 'ty; 'it, i'shecessziry topre a V vent the breech-b tzmoving. to the extreme green 'This is "done :by n'owingfthe'stop 10 to it hethird'end last.po sition',;es shown'in Figsf g.s-,1 22,;. end23 ,11?'In-th s etiti n the retract; 'nt the I I time the; hreech bolt will bei disposed above the rear,

*the upper-- most certrid'ge, ett nginfront'o the breech 72o, boit andib'ei'ng; ed forward when the breech j-bolt'moyes-forwardfl a .f The stop lfl'is held in varitins positionsby'e spri -pressed pin which rides "into end 'o'uto recesses 10 on one of the lugs in which "zslfthe stop is pivoted. a "Ref' g" to Fig: 1, the gun; as, before "stated, is arranged es etakedown by having 4 the barrel andfreceiver separable fr'omthetf H ortion of the frame that carries 'the' .st'ock. 0' I o gain aceesstq the gas-operated parts, it is' not ne'cessii'ry to remove 't e-bands 7 and'S,

- but sii'n'pl' to remove the front sight 5,- to loosen en band 8, and: to turnthe catch 84, czirried by the barrel-frame and -'pro j eeting into 'a rotatable and grooved keeper 85 in the lower sideof the guide 86. (See Figs.l.7 and 17*.) When the catch84 is rotated to bring the rib 84 on its uppenenfd longitudinal with the bore of' the gun and 'inaline nent with oiguide-g'rooye 84, carried by th'e'barrel, the barrel-frame may be lifted slightly at its for 'ward eh'dfrom behind the shoulder on the barrel, th' opening in the barrel-franne being enlarged permit -tl1'is inove nent. I The fraine may then be slid endwise over the bar- .rel and withdrawn, which will expose the gas tube or cvlinder and its securing-head S7. The sec-uringdiead (see Fig. 18) is fitted by a dovetailed groove 88 to an undercut tongue; 59 89 on the underside of the grin-barrel andmay be withdrawn longitudinally after dcpressing its detent90, pressed vvertically bya spri'ng 91anto a socket. 9; on the under side 1 of the barrel, talking the cylinder with it and leavin the piston with its rod connected the parts which it operates, as already Kwith described. The spring 93 for. returning the piston forward sezits at its forward end against the piston a'nd at itsrearend against the rear 66 "end of the guide 86, already referred to, the pi,ston-rod working through the rear wall of @Ihis guide, aselearlyshown 111F155. 1T. if Q 1 Having. thus described nrVinvention; what f ";I "c-lainiis .f-to "on Positi'on-to prevent eg s breech-bolt, and the magazine; of an-oscilla- 1. Inn ges-operated'fireerrn, thecombinetion" with the 'rnagezinega breech-bolt movable toward endifro'm-ithe breech across the magazine, and a gasmperzited driye rod, of

" hend operat'ed meanslnormjally' gout 'of en,-

gege n'ent''W itl i the breech-bolt andiadeptedjo to e'thrown. mto eonneetion'wlth the breechbolt to moire. it; and .t ns fofr; the rearward" movementot :the 'breechf ebe t' to," prevent. a; 'feed fromjthe'magezine bt'it to per f nite hand feed into the breech.- 2, jInamegagine fireerm,% thecornbinetiog ';'I'neg'azine ahd to'another positio "8o breech open.x' 1 ;"-';.-3.;-InT a gun, the. combination 'wf i h .t'he I breech-bolt, of anosei-lletory eirid slidin'g' re.- ltraetin bar, fendadpin throughziwhich the breecholt i's move by the-her, eccentric- Ball -pivotedj enseid retra ctingebannlndiiidv-T ab e into'and'out of=cbntrolling relation with sgeid-bolt onthe oscillation of the'retraoting er. 14; In a gun, the combination with "the 'tory and sliding; retrecting 'pagr a, stopend a pin, through which-the reath-t nts moved ythe-baneccentricall vmounted on 'said re tracting-bar and move. le intoandontof eon- I trolling-relation with'said bolt on the oscillation of the retracting-hair, said-stop 'niovable to a position to permit'afeed frolii the nagazine end to apposition to limitltherearward movement of. the'breech-bolt to prevent a-' feed from the magazine; v i

5:. In a gnn,'the coiiibin'ation' with the breech-bolt, of anosc-illatory and sliding retracting-bar. 'and a ,pin through which the breech-bolt is moved "by the hart-eccentric- 105 ally mounted on saidretractihg-har and movable into and out of controlling relation with said boiton the oscillation of the re'-' tracting-bar, and means engaging the. retmcting ba'r to hold the breech open,

too

6. In a gun, the. combination with the breech-bolt, of an oscillator and sliding retracting-bar, a pin-through which the breechbolt is moved by the bar, eccentrically mounted,on said-retracting-bei' and movable into and out of controlling relationwith said bolt on theoscillation .of theretraetingbar, and a stop moi-able to a position to limit the sliding movement-of the retracting-bar and-.to another position to engg'ge' the bar to hold the breech open-.- a

7; In a 1111, the combination mth lzhe mag 'azine. an the breech bolt of hand -operated moans nor-mall out of connect on'with the breech-bolt but adaptedfon connection with the same, and'meana mov able to one posit on to engage the hand-operated means'and limit i its rearward" mqyfeme'nt to p e nt a feed from the magazine and tofanother position to Permit the feed. v 8 ,In a gun, the combination with the magazine'ar'i'd the'br'eech-bolt, of hand-operated means normally out of connection with the breech-bolt but adapted. for connecti'ori' with I the same, 'andmeansmovable to and; from a position to limit the rearward movement of the-hand-operated means said means being I '1 Q"m0vable ,-'to anotherfposition to'engage the- Y .hand-operated -means and hold the breech '4 9. The combination ofthe breech-boltiirovidedlwith slotsonopposite'sides, a firing:

' 1 5 a lockin -bar fulcrumed onthe forward portion of said bolt and its rear end-forming the locking-abutment, wings extending downwardl on opposite sides of the breech-bolt,

i provi ed cam-slots, and a bifurcated connectin rod, each member of which carries ja stu which en ages inlone of the camslots tocont-rolthe ocking-bar,fand a. stud which enters one of the slots on the side of the bolt and engages the firing-pin.

2 5 10. The combination with the receiver-and the breech-bolt having guide-faces uided ceiver; of a lockin -bar fulcrurned on the forward portion of t e breech-bolt, fitted'in a 3o recess in said breech-bolt and having its rear end' movable upward outof said recess and 1 into engagement-with an offset in'the receiver when the breech-bolt is in itsclosed position; and win s on the locking-bar ex- 5 tending downwar on opposite sides of the secured on the breech-bolt orming the rear abutment for the spring, and aving a limited movement'in the breech-bolt and an abutment on the frame with which the bushing contacts near the end of the movement of the breech-bolt to cushion the latter at its rearward limit. p

12; In combination with the breech-bolt,

the firing-pin mounted therein and the projecting-spring for the firing-pin; of a bushing secured on the breech-bolt by a slot-'and-pin connection'forming the rear abutment for the spring,' and having a limited movement in the breech-bolt, and an abutment on the gun with which the bushing contacts near the end of the movement of the breech-bolt, tocushion said bolt.

6 13. In combination with the firing-pin,-

and means for cocking the same; a sear having a bifurcated forward end 1ntroducedilongitudinally into suitable bearings and a pin between upper and lower tracks int 6 reside members-an ton-rod screwed 1nto thecross-head and havengaging-I'n rear of the sear holding it in its bearings, v '65 14;;Thecombination of the breech-bolt having a firing-pin andan] extractor, an ejector'-p'ost,'anda sear formed with a bifurcated forward'endseated in bearings OIIzOPPOSitG sides "ot the ejector-post, "j

15. In an automatic-gun actuated by=.fir-. ing, the combination-with the breech-bolt having a firing-pin, the sear-{the trigger, and a sliding block inwhich' the trigger is mount:

ed, projecting intothe path of a part moved; 1

by the firing ofthe'guny. 1 1

.16. In an automatic gun actuatediihwfiring, .the='combination' of thebreech-bolt,-"the 4 I operating-rod for reciprocating the-{breechbolt, the searythetngger, and; a" movable 8o block in whichthe trigger is mounted, having lateral projections in t e path of the operating-rod. y

-. 17. In combination with the breech-bolt, a

. bifurcated operating-rod for reciprocating it, 8 5

consistin o the cross head the side members fitted by dovetailed sockets to the crosshead, and the taper pin passing through the side members and the cross-head.

-18. In combination ch-the breech-bolt, a bifurcated o crating-rod for reciprocating it, consistin o the'cross-head, the side members fitte by dovetailed sockets to the crosshead, and the ta er pin passing through the -the cross-head and the pis.-

mg a taper end seated inthe taper pin.

' 19. The combination of a breech-bolt provided with locking means movable to and from the breech and having cam-slots dis- IOO posed on opposite sides thereof, and a bifurcated connecting-rod each member of which is located on one side ofthe breech-bolt and z carries an inwardly-extending stud engaging in one of the cam-slots to "cause the locking and unlocking of the breech-bolt when the/ rod is moved.

20. The combination with the breech-bolt, of a locking-dog carried thereby and provided with cam-slots on opposite sides. there- I x o of, and a bifurcated connecting-rod each member being located on one side of the bIGGQhebOlt and having an innardlixextending stud en aging in one of the Cami-slots to causetheloc ing and unlockingof tlnbrccchn5 bolt.

21.. The combination of the breech-bolt movable-to and from the breech to close it and havingcain-slots disposed on opposite sides thereof, the forward portions of the \20 slots being of low pitch, and the end port ons being recessed to provide a shoulder-mind bifurcated connectin :rod having eachi'hem ber located on one sid e of the breech-belt and en aging in the forward portion of the Slot to "1.5

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