US2377692A

US2377692A - Firearm

Info

Publication number: US2377692A
Application number: US543113A
Authority: US
Inventors: Jr Malvin M Johnson
Original assignee: EDWARD E RICE; MELVIN M JOHNSON; MELVIN M JOHNSON JR
Current assignee: EDWARD E RICE; MELVIN M JOHNSON; MELVIN M JOHNSON JR
Priority date: 1944-07-01
Filing date: 1944-07-01
Publication date: 1945-06-05
Anticipated expiration: 1962-06-05

Description

June 5, 1945. M. M.,JOHNSON, JR

FIREARM Filed July 1, 1944 Patented June 5, 1945 touMelvin Johnson, Brookline, Edward E.

Rice,;B0ston,-:Mass;, and himself, as trustees of the lehns mlf tent stL-BestQngMgss-J;

Agn ieetieh' we h ettee:eea ue (Q h re'la This inten ien :eleteete firea ms 9i the-type h ing nmeet neh lt ltieh rotate inteen utot. leekine P ition t the. t ward. end. of. its st oke endmere arti ula te fi earmsu i the type u'whieh the u lqe ingp the h l -isefieetiby e her eeoilme ement.o th barr l. and which. the...r eo ..spr n acts on t e.. t thnou h at. pusher .ha i ge earn sur ace Whieh ,c msthe.heltintoloe ed .p siti ne th forwar end otit as ll DI QlT,D&tIL ..29%,156; .14amtenazelstto.

i et 3 si stqnplettview. o -these ntfe por ion .2. he fi earm en F et. use e p emview. o :the b l -ehd pusher, showing inb Qlienlines the. mpreve l meenst qr p eventinelleb undt.

The..- pex ieulet mbedime .t .012 the: inventt n heee llli. 1 1. 1: urpese Q il es ze i n. is. e fire:

heleinetheieeoil. spr n ndthe-lswer.tubeieenr st htinepe. ompa ment. or. r pai -9.001s. er t e i s mulderrpieee hich .1%} se z es as. e e: "fee: the teen ends Qi the. eereeeid. tubes, e ver n p vot d; at. e teewine upwa dly outoffline with the rear ends ofjthetupes a re,- coiling. barrel 1, a shie 1d, 8 surrounding the rear end: of the barrel' g, fore grip 9 pivotally, mount? edonthe forward end ofthe' shield', a magazine H; a. bolt mend-a pusher tithe bolt l2 having an-aotuating -hand1e*l4 projecting outwardly through a slot l5 in the--right-h and sideof the receiver f'or use 71H? manuallymetracting thebolt. The; forward end of theslot-is wider to form antejectiomopening1 6. Opposite this opening is EQ AEE f fw lffillizalfoundithegream end oi; the push- .eetinereeeih ra s eul er; 8,011; the. push? The; pusher. l-3 -s 1 provi d;-,.,w-ith-. 1a; vertiggal aemsuxieeeitoftbe pusherhressm e etnst h ten ieull' which nrpieetsior erstly eve he. elt and -P l yidQL. Zfi its. fo wa d. end. wi h e eem whiehprejeete u wardly into a e tltiinthet l? o fthe i eeiyer to. nreventrotetien. e 'th Rusher- The; halt. L2: is. else .n qvided" Wi hen. upward .prgr jeetim. 2.1 hes/me. a. c m .eu i 2 en ee eb e with. hes r eee' e and. ehqth eem. surf ce. 9 enees able :with. the. urface. 1 thee. .cei. i. The. p iee p -2Taheeaxfiae. he e? tm i n. the emot 2.6.; Wh le; he. bel :r-eeipr mee in heels a d. tort At itsg enwerd; end. the belt-is ie tleizwith en. mu let: oi q ki e neeeeehl hind. 1 mg ss the D tails. of ee s tuet pnu f the. enous Qtt e firearm. tiis q ei i est-Pen in ape teat me fierieLNumhers ..4.. ;0.s9,i. L5L 8;9rt @119 eteuezinlee Auguste; 19.4% A s a. sl ght". e ee tenee b tw enuth .cem suri ees .9. and. 3. ;Whehthe bol s.ih..its .fprwerd; oelsettnoe tien... Thus when the. gun i firedthe. oltend; barrel; zreeq i ts;- Iee her- 9. 1 a h hort. dis eneei. t e. s rface 29.0mm o tr t eeuxfeeetl Q .11 1 .r eeitet the. bottl 10 L in. eeun eltel ehw se dir ttismi thereb junl' kine. the bolt fr m. the

harreh .f lheheltthen eentinues. its. re oil lone,

their-Q112 3.2 12 same, into. the. move. 2 the t p tehe nthe be t rem no ti W'thi .-v it; is-mevine heels attdt f i th Asthe bolt returns to its forward position ther o llerjz eev sthe. r ove. 2.6, the. olt. th ubeme, t e to exotetett l ekmseii theloc p Ihis retetion.. nto ekede pe ition 1s iecte by the soe, 28;Qf..-thb lt. I hi J OW 3g mere: men-t Qt halt; not. oh'1Y-b1finssth ,Qek ...e; .l .s 3 eh ndthe1ues ohthebex te bl t. elsehrinss theeem eurt ee. 2 o the. belt in ine wit th eem eut'i. e 1 on. the.1.:eeeiver.... husth eg hi ulled.thiseyel .eiioh mtipne s z'epea. .di lne mueh as: he e z geine emstmmio'h en nnede oiionemtionis .deser bedinidete l in the ieiqles id. patents .mrtheg tieser hi his .eerdine t9. thls hv-e ttien th ..e'hound chapter.- acted by a pawl 36 which is pivoted at 3'l'betwe'e two ears. 33 on. theleftrh nd-s cLe Qf...the-re ceiy'er. A..s- X :a: .3.9, ursesthe .r erwa hendjov i thehawl utvtandlt; ther b te tine. theaters/Saud end 9 the pawl inwardly against the roller 24' on the pusher. Inasmuch as the counterclockwise rebound of the bolt tends to urge the pusher rearwardly, through the cam surfaces 23 and 28, the

rebound is yieldingly counteracted by the pawl 36. However the forward end 4| on the pawl is inclined sufficiently to be cammed out of the path ofthe roller 24 when the gun is fired, As the bolt and pusher arrive at the forward position shown in Figs. 3 and 4 the pawl 36 snaps behind the roller 24 to prevent the aforesaid rebound.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.

Iclaim:

1. A firearm of the type having a short recoil movement of the barrel, a reciprocating bolt which rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a rearwardly facing cam surface, a forwardly facing cam in the path of said bolt surface for rotating the bolt into unlocked position during said short recoi1,

a recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotating th bolt into locked position as the bolt approaches the forward end of its recoil movement, the pusher having a rearwardly facing abutment, and a spring detent which snaps behind said abutment when the pusher reaches the forward end of its recoil movement, thereby to restrain rebound of both th pusher and bolt.

2. A firearm of the type having a short recoil movement of the barrel, a reciprocating bolt which rotates into and outof locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a rearwardly facing cam surface, a forwardly facing cam in the path of said bolt surface for rotating the bolt into unlocked position during said short recoil, a recoil spring, a reciprocatory pusher interposed between the spring and bolt with'a forwardly facing cam for rotating the bolt intolocked position as the bolt approaches the forward end of its recoil movement, the pusher having a rearwardly facing abutment, and a spring detent which snaps behind said abutment when the pusher reaches the forward end of its recoil movement, the engaging surface-of the detent being inclined sufilciently to cam out of the path of the abutment when the bolt recoils.

3. Afirearm of the type having a short recoil movement of the barrel, a receivena, reciprocating. bolt which rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a rearwardly facing cam surface, the receiver having a forwardly facing cam surface in the path of said bolt surface for rotating the bolt into unlocked position during said short recoil, a recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotating the bolt into locked position as the bolt approaches the forward end of its recoil movement, the pusher having a guide projecting radially into a guideway in the receiver togrestrain rotation of the pusher, and a spring detent which snaps behind said guide when the pusher reaches the forward end of its recoil movement, thereby to restrain rebound of both the pusher and the bolt.

4. A firearm of the type having a short recoil movement of the barrel, a receiver, a reciprocating bolt which rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a rearwardly facing cam surface, the receiver having a forwardly facing cam surface in the path of said bolt surface for rotating the bolt into unlocked position during said short recoil, a recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotating the boltintolocked position as the bolt approaches the forward end of its recoil movement, the pusher having a guide projecting radially into a guideway in the receiver to restrain rotation of the pusher, and a spring detent which snaps behind saidguide when the pusher reaches the forward end of its recoil movement, the engaging surface of the detent being inclined sufficiently to cam out of the path of the guide when the bolt recoils.

5. A firearm of the type having a short recoil movement of the barrel, a receiver, a reciprocating bolt which rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locked lugs and a rearwardly facing cam surface, the receiver having a forwardly facing cam surface in the path of said bolt surface for rotating the bolt into unlocked position during said short recoil, a recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotating the bolt into locked position as the bolt approaches the forward end of its recoil movement, said receiver having a longitudinal guideway along the bolt chamber, a roller mounted on the pusher to project into the guideway to restrain rotation of the pusher, and a spring detent which engages behind said roller when the pusher reaches I the forward end of its recoil movement.

6. A firearm of the type having a short, recoil movement of the barrel, 9, receiver, a reciprocating bolt which rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a. rearwardly facing cam surface, the receiver having a forwardly facing cam surface in the path of said bolt surface for rotating the bolt into unlocked position'during said short recoil, a recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotatingthe bolt into locked position as the bolt approaches the forward end of its recoil movement, said receiver having a longitudinal guideway along the bolt chamber, a roller mounted on the pusher to project into'the guideway to restrain rotation of the pusher, and a spring detent which engages behind said roller .when the pusher reaches the forward end of its recoil movement, the engagingsurface of the detent being inclined sufliciently to cam out of the path of the roller when the bolt recoils.

7. A firearm of the type having a short recoil movement of the barrel, a receiver, a reciprocating bolt'which' rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a rearwardly facing cam surface, the receiver, having a forwardly facing cam surface in the path of said bolt surface for rotating the bolt into unlocked position during said short recoil, a recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotating the bolt into locked position as the bolt approaches the-forward end of its recoil movement, said receiver having a longitudinal guideway along the bolt chamber, a roller mounted on the pusher to project into the guideway to restrain rotation of the pusher, and a spring detent which engages behind said roller when the pusher reaches the forward end of its recoil movement, the engaging surface of the detent being inclined sufilciently to cam out of the path of the roller when the bolt recoils, the detent comprising a pivoted pawl extending lengthwise of the bolt with its forward end swinging into and out of restraining position behind said abutment.

8. A firearm of the type having a short recoil movement of the barrel, a receiver, a reciprocating bolt which rotates into and out of locked position at the forward end of its reciprocatory movement, the bolt having locking lugs and a rearwardly facing cam surface, the receiver having a forwardly facing cam surface in the path of said bolt surface for rotating the bolt into unlocked position during said short recoil, a

recoil spring, a reciprocatory pusher interposed between the spring and bolt with a forwardly facing cam for rotating the bolt into locked position as the bolt approaches the forward end of.

its recoil movement, said receiver having a lonof its recoil movement, the engaging surfaceof the detent being inclined sufiiciently to cam out of the path of the roller when the bolt recoils, the detent comprising a pivoted pawl extending lengthwise of the bolt with its forward end swinging into and out of restraining position behind said abutment and said forward end being inclined suificiently to cam out of the path of the abutment when the bolt recoils.

MELVIN M. JOHNSON, JR.