US2462130A - Automatic mechanism for carbines - Google Patents

Automatic mechanism for carbines Download PDF

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Publication number
US2462130A
US2462130A US731199A US73119947A US2462130A US 2462130 A US2462130 A US 2462130A US 731199 A US731199 A US 731199A US 73119947 A US73119947 A US 73119947A US 2462130 A US2462130 A US 2462130A
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trigger
automatic
slide
hammer
stud
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US731199A
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Rudd Ross
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Rudd Ross
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/46Arrangements for the selection of automatic or semi-automatic fire

Description

Febzz, 1949. RRUDD 2,462,313@

AUTOMATIC MECHANISM FOR CARBINES Filed Feb. 27, 1947 y 4 2 Sheets-Sheet l Feb, z2, 1949. I R. RUDD mams@ AUTOMATIC MECHANISM FOR GARBINES Fileg'Feu 27, 1947 2 sheets-Sheet 2 H E5 .5- D o 4 A. E? J Y z 28 ,$4 4 39' \O RDBB'RUCI Patented Feb. 22, 1949 3 Claims.

(Granted under the act of March 3 188.3, as;

amended Apr1i30 1928;. 370 0. G. 75.7)

Theinvention described in the following speci'- fication and claims may bemanufactured; and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to a new and useful mechanism for automatic operation oi carbines and is particularly designed to modify a carbine, cal. .30 whereby it can be fired either iull auto matic or semi-automatic. The device is very simple in construction and operation, comprising only few parts which are readily fabricated and attached by making very slight changes in the firing mechanism of' the Carbine. One of the most important advantages of the device is that all carbines already in use can be easily and quickly converted with no maior changes in the standard mechanism. The modied gun contains only. two additional operating parts, a cam plate and a. trigger bar, both of which are made from flat material suitable for easy and rapid production. The other parts are a stud, springs and pins of ordinary types. The only modification of. the firing mechanism is bores -ior the stud and. pins, and slots for the plate and bar.

The cam plate is pivotedin the trigger to operate the sear, for automatic tiring. The trigger bar is mounted on the trigger housing for operating the cam plate. The stud is adjustable on the operating slide of the Carbine for operating the trigger bar automatically by action of the slide.

The device is so designed that it can be applied. to the Carbine and then rendered operative for full automatic iire or rendered inoperative for semi-automatic iire. Thetwo conditions of the device depend merely on the adjustment of the stud relative to the operating slide. When the device is inoperative, the firing mechanism functions for semi-automatic re in its normal manner unaffected by the attached device. It is obvious therefore that any failure of the device will not affect the semi-automatic operation of the Carbine, which is one of the distinct advantages of the device.

While one specic embodiment of the invention is illustrated in the drawings and hereinafter fully described, it is to be distinctly understood that the invention is not considered to be limited to said specific embodiment but that its scope is defined by the claims appended hereto.

In the drawings:

Figure 1 is a side elevation of the ring mechanism of a carbine equipped with the device, the

2 parts.beingiinnormal;position;ionsemieautomatic operation;

Figure.v 2; is@ al longitudinal, axial, verticaly sec'- tioircfy themechanism shown in Figure i;

Figure 3i is a: fragmentaryv section or' triggen, scar anouhamrner4 of" Figure 2; theparts beingrin cocked. position, for semi-automatic operation;

Figure 4 isarview similari to Figure, thefparts` being cockedA for automatic operation;`

Figure-5 is a2 View similarto Figure 2, showingthe automatic operation releasing thehammer from its position in- Figurel for firing;

Figure Gis a perspective viewof` the y device".

sociated with'the trigger; sear, hammer and frag'- ment of the operatingy slide; l

Figure '7A is a longitudinal verticalI sectionV of' the trigger;

Figure isa perspective view'oi the cam plate ofthe device for the' automatic operation oflthe scar;

Figure 9 isa -,fragmentaryside elevation'o-ithc modified operatingslide, partly-insection;

As illustrated in the drawings; the device is applied` to a U.' Si carbine, cal. .30' havingthe iiring mechanism comprising theoperating slide i` retracted by gas pressure and returned on' countenrecoilby its spring (notshownl, thebolt 2 with 'ring pin 3; andihammer i pivotedin the' trigger housing iwithtrigger ti andsear l'also pivoted therein. The'sear i is disposed between ears 8 on the upper edge of the trigger 6.. A

pintle pin 9.', received through ears 81 ci" trigger and an elongated slotl'll' insear 'land mountedin housing 5; pivotally mounts trigger,Y ii in. housing 5; andv sear l' in trigger S". is seated in trigger 6, bears against dependingklug l2 disposed on thebottom oisear l belowlslot. iii, andv biasesv Sear lrforwardly on pin 91 the forward arm i3 of Sear ijbeing urged upwardly, Trigger fi. has in. its upperv rear. face, a slot le on each,

side. of. which are sockets. i5, respectively, to re.- ceive. the ends of' the trigger spring iii mounted in housing. 5. and biasing trigger 6. forwardly, into.

inoperative position. Trigger. 6 has a forwardly projectedsaiety nose lil' cofacting withal sliding safety bolt Edin housing. 5. and, having a slot iii.

into :whichnose Il is received when the safety4 bolt t8. is oscillatedv to, permit ring. Trigger has a shoulder 2i)` on its rear face comet-ingfwith.

housing 5to-limit. rearward vmovement of triggeri 6. Trigger. @has a pair ofl-upstanding ears 2l to co-actwith rear arm.2.2of.sear 'l for.Y semi-auto.- i TheI hammer, il.: is. pivoted on matic. operation.

pintlelpinl @amounted in housing' so; th at ywhen its head 24" is swung iforwardly it co-acts with A. scar spring.;v l 1."

firing pin 3 when bolt 2 is in battery. Head 24 has a cam shoulder 25 co-acting with bolt 2 to swing head 24 rearwardly to cock hammer 4. Hammer 4 has a convex bottom enge 2c against which forward aim I3 of sear l bears, and a notch 2'I a-t the rear end of edge 25 into which the outer end of forward arm |3 is received when the hammer 4 is cocked. Hammer 4 has an operating plunger 28 mounted in the housing 5 and urged forwardly by the hammer spring 23', to

cause head 24 to impinge against ring pin 3 when hammer 4 is released from sear ll.

The improved device, by which the above described details of construction are modified for automatic operation, comprises an operating cam plate 29 for actuating sear 'I to release hammer 4, a trigger bar 3|) yforactuating the plate 29, a selector stud 3| for actuating the trigger bar 99 and a stop-pin 32 for limiting movement of plate 29.

The plate 29 is disposed in slot I4 of trigger 6, being pivoted in trigger 6 by pintle pin 33 in trigger 6. Plate 29 has a cam shoulder 34 coacting with rear arm 22 of sear and a head 35 projected upwardly at the rear of plate 29. The trigger bar 30 is slidably mounted on housing by means of a headed pin 36, the shank of which passes through an elongated slot 31 in the said bar and is welded to the trigger housing 5. Bar 30 has on its rear end an operating finger 38 received in a slot 39 in housing 5 and .co-acting with head 35 of plate 29 to rock plate .29 forwardly when bar 30 is oscillated forwardly. Bar 30 has on its front end an upwardly extended operating post 40 with which co-acts the selector stud 3| which is vertically slidable in the rear end of the operating slide I. As clearly shown in Fig. 9, the stud 3| is received in a suitable bore 4| in slide I, with depressions 42 for spring pressed button 43 for retaining stud 3| in adjusted positions. Stud 3| is mounted in slide immediately adjacent retracting handle 44 for manual movement of slide I. It will be understood (Fig. 6) that when stud 3| is depressed to extend below slide it engages post 40 to slide bar 3|) forwardly, and that when stud 3| is raised to extend above slide I by placing a finger under the stud and pressing it upward (Fig. 1) the stud 3| passes above the top of post 40. The trigger bar 30 has a shoulder 45 against which bears an expansion spring 46 mounted in housing 5 for sliding bar 30 rearwardly when spring 45 is tensioned by forward movement of bar 39. Pin 32 is mounted in housing 5 rearwardly of plate 29 to limit rearward movement of plate 29 to properly relate head 35 of plate 29 and finger 38 of bar 30.

From the foregoing description of the details of construction of the device and its application to the firing mechanism of the carbine, its use and operation will be obvious. Figures 1, 2 and 3 show the device in inoperative position, thereby conditioning the Carbine for semi-automatic operation. To render the device inoperative the selector stud 3| is raised (Fig. 1) The parts being as shown in Figure 2 (normal position), the operating slide is retracted by pulling the retracting handle 44, thereby retracting bolt 2 to cock hammer 4, feed a round from the magazine into loading position, and `tension the spring of slide I. When the slide I is released, its spring projects the slide I and bolt 2 to battery, chambering the round. As shown in Figure 3, the sear 'I having its forward end I3 seated in notch 2`I of hammer 4 is retracted on pin 9 bythe force 4 of the tensioned hammer spring 28. superior to that of sear spring |I, its rear arm 22 being disposed on top of ears 2| which are depressed by trigger 6 disposed forwardly in inoperative position. When safety bolt I8 is shifted to permit nose I'I to enter slot I9, the carbine can be fired. When trigger 6 is squeezed, it rocks on pin 9 to raise ears 2| which raise arm 22 to rock sear I releasing hammer 4 which functions to re the chambered round. The recoil of slide and bolt 2, ejects the case of the red round, cocks hammer 4, and feeds the second round to loading position. Counter recoil chambers the second round and brings the slide I and bolt 2 to battery, and the carbine is conditioned to be rered by trigger 6 which, released after first round was fired, has returned to normal inoperative position. It will :be'noted (Figs. 2, 3 and 4) that during the above-described operations, nger 38 is held fully retracted and plate 29 is slidably supported by stop-pin 32, and has no part in the semi-automatic operation.

Figures 4, 5 and show the device in operative position thereby conditioning the Carbine,y for automatic operation, To render the device 0perative, the selector stud 3| is depressed (Figs. 5 and 6). The rst round is fired, as above d escribed. The trigger 6 is not released but held retracted as shown in Figure 4. As above described, recoil ejects the case of the fired round, cocks hammer 4 and feeds the second round to loading position. It Will be noted (Fig. 4) that when hammer 4 is cocked the rear arm 22 is moved against ears 2| in line with arm 22 and not below as previously described. Sear spring Il urging arm I3 of sear 'I upwardly maintains hammer 4 cocked.. Counter recoil chambers the second round and brings slide I and bolt 2 to battery. After the mechanism for rotating bolt 2 for locking has functioned, slide moves forwardly sufiiciently (Fig. 5) to cause stud 3| to engage post '4D and slide trigger bar 30 forwardly, thereby drawing finger 38 against head 35, rocking plate 29 which was raised by retraction of the trigger to pressv shoulder 34 against arm 22 of sear 'l releasing hammer 4 which fires the second round. It is obvious that this automatic operation continues until the magazine is exhausted or the trigger 6 is released to lower plate 29 and ears 2| thereby moving head 35 of plate 29 out ofthe path of finger 38 (Fig. 3).

From the foregoing description of the opera.- tion. of a Carbine equipped with the improved device, it is obvious that the structural elements, whereby full automatic operation is provided, can` be incorporated in the ring mechanism. of the Carbine -in such a manner as to dispensewith any,V

adjustability, to produce a carbine designed for full automaticre only. This can bedone ,by merely mounting stud 3| non-adiustably on the slide as by making it integral therewith.

Having described the invention, what I claim 1s:

ljIn an attachment for the 'firing mechanism of a gun whereby said m-echanisrncan b'eoper'ated alternatively for semi-automatic andffull'a'utomatic fire, said mechanism comprising a trigger housing, a trigger pivoted in saidhousing,`"a ham;

mer pivoted in said housing, a sear pivoted in said trigger for holding said hammer cocked, al slidable bolt having a ring pin therein, andan operating slide for sliding lsaid bolt, reciprocable on recoil and counter-recoil, the combination of a cam plate pivoted in said housing and having a cam shouldervand an upstanding head; a trig.

5 ger bar slidably mounted on said housing, having an operating nger on its rear end and a post on its forward end, and spring-biased rearwardly; and a stud adjustably mounted in sa-id operating slide for operative and inoperative positions to condition the mechanism for full automatic and semi-automatic nre, respectively, the parts being so related that the hammer is cocked by the bolt on recoil of said slide, and when said stud is adjusted to inoperative position, for semi-automatic iire, the cocked hammer is released to impinge against said ring pin by releasing the sear by squeezing the trigger, and that, when said stud is adjusted to operative position for full automatic re, on counter-recoil of said slide the stud contacts said post, sliding said bar forwardly, the forwardly moving finger of said bar, contacting said head of said cam plate, rocks said plate, said cam shoulder of the plate rocks the Sear, and said hammer is released to impinge against said firing pin.

2. In the ring mechanism oa gun operable alternatively ior full automatic and semi-automatic re, the combination of sliding operating means retracted on recoil and projected on counter-recoil; spring-pressed percussion ring means cocked by said operating means on recoil; a pivoted detent for engaging said ring means; a manually operated pivoted lever for rocking said detent to release said cocked ring means; a second pivoted lever for rocking said detent to release said-cocked ring means; a sliding member for rocking said second pivoted lever; and a second sliding member on said operating means, manually movable alternatively into operative and inoperative positions to condition the mechanism for full automatic and semi-automatic re, respectively, and for sliding said rst sliding member when said second sliding member is in operative position and said `operating means is projected on counter-recoil.

3. In a gun, operable alternatively for full auto- 6 matic and semi-automatic fire, the combination oi a trigger housing; atrigger pivoted in said housing; a hammer pivoted in said housing; a sear pivoted in said trigger, for holding said hammer cocked; a slidable bolt having a firing pin therein; an operating slide for sliding said bolt, reciprocable on recoil and counter-recoil; a cam plate pivoted in said trigger and having a cam shoulder and an upstanding head; a trigger bar slidably mounted on said housing, having an operating finger on its rear end and apost on its forward end,- and spring-biased rearwardly; and a stud adjustably mounted in said operating slide for operative and inoperative positions to condition the gun for full automatic and semi-automatic re, respectively, the parts being so related that the hammer is cocked by the bolt on recoil of said slide, and when said studr *is adjusted to inoperative position for semi-automatic re, the cocked hammer is released to impinge against said firing pin by releasing the sear by squeezing the trigger, and that when said stud is adjusted to operative position, for full automatic re, on counter-recoil of said slide the stud contacts said post, sliding said bar forwardly, the forwardly moving nger of said bar, contacting said head of said cam plate, rocks said plate, said cam shoulder of the plate rocks the sear, and said hammer is released'to impinge against said firing pin.

ROSS RUDD.

REFERENCES CITED The following references are of record in the

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539447A (en) * 1946-10-04 1951-01-30 John L Lochhead Selector for automatic firearms
US2649031A (en) * 1947-10-16 1953-08-18 Alonzo F Gaidos Fire control mechanism
US2649030A (en) * 1950-01-16 1953-08-18 Alonzo F Gaidos Selective fire converter for semiautomatic firearms
DE1228966B (en) * 1961-11-22 1966-11-17 Staatsbedrijf Artillerie Inric Trigger device for an automatic or a semi-automatic firearm
US5000076A (en) * 1989-12-20 1991-03-19 Mr. Gasket Company Automatic safety release for firearms

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1190653A (en) * 1916-04-12 1916-07-11 Charles F Hughes Automatic firearm.
US2324125A (en) * 1941-02-21 1943-07-13 Automatic Appliance Corp Firearm
US2375721A (en) * 1940-06-05 1945-05-08 Dryden Kuser Automatic rifle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1190653A (en) * 1916-04-12 1916-07-11 Charles F Hughes Automatic firearm.
US2375721A (en) * 1940-06-05 1945-05-08 Dryden Kuser Automatic rifle
US2324125A (en) * 1941-02-21 1943-07-13 Automatic Appliance Corp Firearm

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539447A (en) * 1946-10-04 1951-01-30 John L Lochhead Selector for automatic firearms
US2649031A (en) * 1947-10-16 1953-08-18 Alonzo F Gaidos Fire control mechanism
US2649030A (en) * 1950-01-16 1953-08-18 Alonzo F Gaidos Selective fire converter for semiautomatic firearms
DE1228966B (en) * 1961-11-22 1966-11-17 Staatsbedrijf Artillerie Inric Trigger device for an automatic or a semi-automatic firearm
US5000076A (en) * 1989-12-20 1991-03-19 Mr. Gasket Company Automatic safety release for firearms

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