US2978962A - Selective automatic fire converter for bolt action rifle - Google Patents

Description

April 11, 1961 J. T. lvY 2,978,952

SELECTIVE AUTOMATIC FIRE CONVERTER FORBOLT ACTION RIFLE Filed April 20, 1959 4 Sheets-Sheet 1 IN V EN TOR.

April 1l, 1961 J. T. lvY 2,978,962

SELECTIVE AUTOMATIC FIRE CONVERTER FOR BOLT ACTION RIFLE Filed April 20, 1959 4 Sheets-Sheet 2 aa |"8 6 5 3743544/ fle/Zw 4f '1.1111'. YI'IIII! r o /ob il; ""5 l" INVENTR. JESS/E 7T /VY Arron/VE s April 1l, 1961 J. T. lvY 2,978,952

SELECTIVE AUTOMATIC FIRE CONVERTER FOR BOLT ACTION RIFLE Filed April 20, 1959 4 Sheets-Sheet 5 'lll/lll i 'J 250 25@ 70x ver IN VENTOR Jess/E 7T /vY ATTORNEY.

April ll, 1961 .1.1'. lvY 2,978,962

SELECTIVE AUTOMATIC FIRE CONVERTER FOR BOLT ACTION RIFLE Filed April 2o, 1959 4 sheets-sheet 4 M/ -A/ 4"4l loo a :E 2?x ze? m y .l5 275 Jj 271m- 265' N56 26e T* ,/26/ j g' J/280 J 26; i Inl w Ylllllllll-l 117,11*?1; :1111/ 'IIL 25/ /l L -Az r11/1111111111111,lill/lili.

IN1/EN oR. Jess/E /VY wrm/Ens United States Patent O ice -sELEcTIvE AUIoMATIc FIRE CoNVERTER Fon BOLT ACTION RIFLE This invention relates'to improvements in repeating ries of those types employing a sliding bolt action. More particularly, the invention has reference to improvements in tire converter mechanisms selectively operable for full or for semi-automatic iire control.

This application is a continuation-in-part of my copending application iiled under Serial No. 696,738 on November 15, 1957. Y

It is the principal object of this invention to equip a bolt action rifle with a novel means whereby the rifle user may selectively and quickly make adjustments in certain mechanisms used in conjunction with the hammer and trigger controls, to eiect either the full automatic or the semi-automatic firing of the rilie.

Still further objects and advantages of the present in vention reside in the combination of the various parts thereof; and in the mode of their selective adjustment and operation for the intended purposes, as will hereinafter be fully described. v

In accomplishing the above mentioned and other obv jects of the invention, I have providedtheimproved def tails of construction, the preterred forms ofwhich are illustrated in the accompanying drawings, wherein:

Patented Apr. 11, 1961 Fig.v 12 is a vertical cross-section, taken on line 12-12 in Fig. 10.

Fig. 13 is an enlarged side view of the hammer and trigger mechanism of Fig. 10 as adjusted -for semi-automatic action. i

Fig. 14 is a similar view of the parts shown in Fig. l0, showing the scar as released by initial pull on the trigger but the hammer restrained from striking bythe trigger.

Fig. is a side view illustrating the use of a safety latch for the trigger mechanism.

Fig. 16 is an underside view of the slotted portions of i the receiver andbolt. Y

Referring more in detail to the drawings: In Figs. 1 and 2, I have shown a` typical rifleto which improvements embodied bythe present invention have been applied. The rifle herein shown comprises the usual barrel 10, attachedto a stock 11 and joined atits inner extends along the underside of the rear end portion of Fig. 1 is a side elevation of a bolt action riiie embody-Y l ing the improvements of the present invention therein.

Fig. 2 is a top view of the rie, as shown in Fig. 1. Fig. 2a is an enlarged cross-section, taken on line Za-Za in Fig. l. y

Fig. 3 is an enlarged side view, with some parts in section, showing apart of a gas operated, automatic bolt actuating mechanism that is applied to and used with the rifle in Fig. l.

Fig. 4 is an enlarged, cross-sectional detail, taken on the line 4-4 in Fig. 3. v

Fig. 5 is a side view of the preferred form of hammer and trigger mechanism used in the present rie, and also showing the fire control devices in the adjustment for semi-automatic action.

Fig. 6 is a cross-section taken on line 6-6 in Fig. 5,-

showing the longitudinal slotting of the receiver and bolt for reception and travel therein of the anvil as applied to the tiring pin.

Fig. 7 is a longitudinal section, taken on the horizontal plane of line 7-7 in Fig. 5.

Fig.l 8 is a vertical cross-section through the receiver, bolt, and rear retainer latch, taken substantially on the line 8 8 in Fig. 5.

Fig. 9 is a side view, similar to that of Fig. 5, but showing the selective re control mechanism as adjusted for the fully automatic operation.

Fig. l0 is a side elevation of a modiiied, or alternative form of ire control 'mechanism that may bel used in conjunction with the devices of Fig. 5, vshown adjusted for a fully automatic operation.

Fig. 11 is a view, similar to that vof Fig. 10, showing the sear released from the hammer by an initial triggerv pull but held against striking the anvil.

the barrel and cradles it therein, as shown. It is also shown in Fig. l, that the rifle is Vequipped with -a pistol' grip portion 13 that is fixed to the stock 11 below the receive'r 12 and immediately backof the usual trigger guard, designated at 14.. 1

The metal receiver 12 has a bore from end to Vend;

designated at 2 4 in Fig. 6. Reciprocallycontained in this* bore is an elongated breachbolt 25. At its forward and rearward ends, the bolt is equipped with the usual` locking lugs 27 adapted, byk rotative adjustments of the bolt,vv in opposite directions to be lockingly engaged with `and disengaged from coacting lugs or shoulders formed inthe bore 24. Y l

It is further to be understood that the receiver 12 is formed in its underside, and at a location` belowV the bolt when the latter is open, as shown in Fig. 2a, with Ya longitudinal slot or passage 28. This passage registers witha similar passage 29, formed upwardly through the underlying portion of the stock, designed to receive the usual' cartridge clip 30 from which cartridges are automatically spring fed, one at a time, into the receiver bore or chamber in accordance with the ybolt action, as is Well understood in the art.

In this connection, it will be explained also that in the riiie loading operation, a cartridge is advanced fromthe cartridge clip into the receiver when the bolt is fully re tracted. Then, as the bolt is moved forwardly, it yengages and pushes the received cartridge into the breech end of barrel. Then the bolt, when fully advanced, is

- locked by a rotative adjustment, thus to hold the car-l the riiie.

',.aspresently explained.

tridge for r'ing. After the cartridge has been lfired, the bolt is released by its reverse rotative adjustment and is retracted. The empty cartridge is thus extracted and is` automatically vejected by means associated with the bolt.

j For effecting the rotative adjustment of the locked bolt for' unlocking and then to effect itslongitudinal 'movel ments, both'for extraction and loading, various automa` tic means'may be employed. In the present instance the' bolt is equipped at its rearward end with a yshort tubular' extension member 35 as shown in Fig. 5. Fixed on the: rear end of this extension member, at its top side, is aA knob form of handle 38 that may be grasped for the' manual vactuation of the bolt when such is desired, asv for example, to open the receiver for initially loadinigS Also, the bolt extension 35 is formed 'on its. underside at its rear end with longitudinally spaced;

paired, outwardly directed ears 39-39 which are ern-' ployed for the attachment to the bolt of the selected" automatic means for its automatic reloading operations Contained coaxially of and extending to the full length of the bolt 25 is a bore 40 containing the tiring pin 41 which pin, at its forward end, as shown in Fig. 5, has a portion 41f of reduced diameter adapted, on A'hammer relea-se, to strike the primer of the loaded cartridge in the barrel for ring. Atits rear end, the firing pin extends into the sleeve 35 and has a head portion 42 fixed thereon. A coiled spring 44, contained under compression in the sleeve and bearing at its ends against the bolt and head 42, respectively, normally retains'the firing pin in a slightly retracted position ready for tiring.

Fixed rigidly to the rear end portion of the firing pin and extended downwardly therefrom and through a longi-` tudinal slot 48 formed in the underside of the bolt as seen in Fig. 6, is an anvil 49 against which a hammer, 4as presently described and explained, is caused to strike to fire the riiie. This slot 48 is wider than the anvil 49 and so shaped as not to interfere with the required rota# tive movements of the bolt for locking and unlocking it. It is to be understood also that the base portion of the receiver is formed with a longitudinal slot 50, as in Fig. 6, extending therealong, through which the anvil, as projecting downwardly from the ring pin and bolt, extends to a position for being struck by the hammer. The firing pin and anvil each have longitudinal movement in the receiver but the pin has no turning action axially of the receiver.

The trigger and hammer mechanism as applied to the rie of Fig. 1 requires that the medial portion of the stock 11 be formed, below the rear en d portion of the receiver 12, with a chamber 55 as shown in dotted lines on Fig. l, which leads upwardly thereinto and in which a metal frame is fixed. This frame is best shown in Figs. 5, and l1 to comprise a front end wall 56 and also a sidewall plate 57, as in Fig. 7. It also has a bottom wall to which the trigger guard 14 is fixed. Fixed in the side plate 57, perpendicular thereto as noted in Fig. l2, is a shouldered stud 58 and pivotally mounted on this stud is the hammer which is shown to be in the form of a at plate 59, disposed below and in the vertical plane of the firing pin. As shown in Fig. 5, the hammer forming plate 59 comprises a substantially semi-circular body portion that is mounted on the pivot stud 58 at the center of curvature of its periphery and from which body portion an arm 60 extends radially in an upward direction. The arm 60 is of such length that it can be caused to strike the tiring pin anvil 49 as in Fig. 5, incident to the presently explained rotative action of the hammer when released under spring tension. l

To power the hammer for a cartridge firing operation, I provide a coil spring 62 that is attached at its opposite ends, under tension, to an ear on the front Wall 56 of the enclosing and supporting frame and to the hammer body plate 59 at a point substantially away from the pivot stud 58.

Retractive movement of the bolt after the cartridge has been tired, that may be eifected either manually by grasping knob 38 as in initially loading, or by automatic means as presently explained, causes the hammer plate 59, by reason of the engagement of a part on the anvil 49 with the extended arm 60, to be rotated counterclockwise, in reference to its showing in full lines in Fig. 5, to a position just slightly beyond the dotted line latched position. When the hammer 59 is thus actuated slightly beyond its dash line latched position, it is then, upon slight return movement, normally latched and held in readiness for trigger release. The latching means is a sear 64 that is pivoted at its upper end on the side plate 57 of the frame by a stud 65. Fixed to the upper end of scar 64 is a short rearwardly directed lever arm 66 to which one end of a taut coil spring 67 is attached. The spring acts to yieldingly urge the lower end or toe portion 64' of the sear toward and against the periphery of the hammer plate 59. The hammer body 59 has a ahoulder 69 projecting outwardly therefrom toward the v:anfragen Sear, and when the hammer is rotated by anvil contact and bolt action to a position just slightly beyond the dash line position of Fig. 5, the sear toe 64' drops over the shoulder 69 and the hammer is thereby locked in cocked position by the sear.

The release of the cocked hammer for firing the loaded rie is then elfected by pull on the trigger. The trigger mechanism comprises a trigger lever 70 that is pivoted at its upper end on the stud 58 as shown in Fig. 5 and at its lower end is formed with a finger hold 70 which is located within and is protected by the trigger guard 14. Immediately below and in the plane of the hammer plate 59 is a horizontal, slidably supported release bar 72 with a pin and horizontal slot support 73 at its forward end and a short coiled spring 74 supporting it at its rearward end; this coiled spring being attached, under tension, at one end to a stud 68 that is fixed in the frame and at its other end is attached to an upward rear eudextension 72 of the bar 72 to` pull upwardly and forwardly on the bar. Between its ends, the bar 72 has a pin and vertical slot connection 76 with the trigger lever 70 which crosses it. This provides for the rearward longitudinal actuation of the bar 72 by the rearward pull on the finger hold portion 70 of the trigger. The return of the bar 72 to its normal forward position is effected when the trigger pull is discontinued, by the forward pull of the coiled spring 74. This pull is such as to normally hold the rear end of theY lever 72 slightly above a stud or pin 68 that is fixed in the frame to limit the downward movement of the rear end portion of the release bar 72.

The scar 64 also is formed at the heel of its lower end edge with a downwardly projecting lug 78. When the hammer is cocked and is latched by the Sear, 64, this lug 78 is so positioned that it will be immediately engaged, when slide bar 72 is moved rearwardly by trigger pull, by an opposedly related shoulder 79 formed on the top edge of the bar 72. The initial pull on the trigger for firing shifts bar 72 from its dash line showing, to its full line showing in Fig. 5. This causes the shoulder 79 to engage lug 78, thus to move the sear rearwardly and release its toe 64 from the shoulder 69 of the hammer plate. The spring 62 then powers the hammer plate and actuates it to cause arm 60 to strike the anvil 49 to ltire the cartridge. Thus, the trigger and hammer mechanism as so far described, provides for single shot, manual firing of the rie.

The semi-automatic operation of the rie anticipates that after each shot is red, the fired cartridge will be automatically extracted and ejected and a fresh cartridge loaded into the barrel by bolt action. This reloading requires first that the bolt is slightly rotated in one direc tion for unlocking; then shifted rearwardly for shell extraction and ejection, then returned forwardly for reloading and finally slightly rotated in the other direction for again locking it in closed position. In the present instance, I employ the gas operated reloading means shown in Figs. 1, 2, 3 and 4 which will now be described:

Fixed to and extending parallel with the rifle barrel, at its forward end, as in Fig. 3, is a gas cylinder having a gas tube connection 91 at its forward end with the rifle bore. Fitted in the cylinder 9.0 is a piston 92 from which a piston rod 93 extends rearwardly. A coiled spring 94 contained under compression in the cylinder acts against the piston to urge it back to the forward end of the cylinder after rearward gas operation. When the rie is red, gas under compression contained in the barrel back of the bullet is forced into the vcylinder 90 through tube 91 and drives the piston and rod 93 rearwardly.

The piston rod 93 is flattened along one side, as at 93 in Fig. 4, or may be keyed to the cylinder 90 in any suitable way to prevent any relative rotation thereof.

Fixed to the rear end of piston rod 93, coaxially thereof, is a cylinder 95 and fitted for reciprocal and rotative action therein is an elongated piston 96 which is formedv with a spiral groove 97 extending therealong in which'l 5. groove a stud 98, that is txedrin the sidewall of cylinder 95, rextends for sliding therealong.

Extending from the rear end of piston 96 is a rod 99. This extends to the receiver end of the rie through suitable supportsrand at its rear end has a lever 100 txed thereto, as best shown n Figs. and 8. This lever has an upwardly and inwardly directed end portion extended, as seen enlarged in Fig. 8, between the ears 39-39 of sleeve 35 on the rear end of the bolt 25 and joined by a sliding pin and slot connection 101 therewith. Thus, when the firing of a cartridge causes the cylinder 95 to be driven rearwardly, the stud and spiral slot connection ofthe cylinder and piston 96 causes rotative turning of rod l99 and lever` 100 first, to rotate the bolt a required interval for unlocking it for its rearward travel under force of the exploded cartridge, then with continued rearward travel of the rod and piston under force of the tired cartridge the red shell is extracted. Then the bolt is returned to and is locked in breech closing position. Thus, with the present bolt operating mechanism, each cartridge firing operation effects the unlocking of the bolt, the shellextraction and ejection, the reloading and the locking of ,the bolt. Also, and incident to shell extraction and ejection, the hammer mechanism is rotated rearwardly and latched in cocked position ready for release bytrigger pull. tion of the rille.

: To ,adapt the rifle for fully automatic firing,-that is, to cause firing upon pulling the trigger and continuous and rapid ring as long as the pull on the triggeris retained, the: following described mechanism is employed: This mechanism as show n in Fig. 5',V comprises a right angle bell crank lever 205 that is pivotally mounted at the junction of its two arms by a stud 206. One arm, 205a, of the bell`crank extends horizontally below the rear end portionk of rod 99 while the other arm 205b extends downwardly from the pivot 206. Pivotally attached to the lower end of arm 205b is a horizontally directed latch lever 207 which extends forwardly acrossthe sear 64 and is formed'at itsk end with a downwardly directed hook 208 adapted, as presently explained, to be'engaged with a stud 209 on the sear. A short coil spring 210, attached to arm 205b and lever 207 normally holds the hook end of the lever up and slightly disengaged from the stud 209 as in dash lines in Fig. 5. It is also seen in Fig. 5 that a link 211 is pivotally joined at its opposite ends to the latch link 207, near its rear end, and to the upper end portion of arm 72 of bar 72. Link 211 serves, as presently explained, to retain the latch lever 207 in position to cause the sear 64 to be released from hammer 59 at the exact instant thebolt is rotated to locked position.

Slidably mounted on the horizontal arm 205a of the bell crank lever 205, is a block 215. This is adjustable on the arm into and out of alignment with the lower end portion of lever 100, as attached to rod 99. When in alignment therewith, as in Fig. 9, each initial rotative action of rod 99 as effected upon the tiring of a cartridge in therille, causes the lower end portion of the lever 100 to turn to its dotted line showing in Fig. 8 and in doing this'to engage the top surface of block 215 and thus actuate the arm 205a downwardly. This movement of arm 205a causes arm 205b to pull the latch lever rearwardly. Immediately prior to this, the initial rearward pull on the trigger leverl that started the tiring operation, caused a lug 70s that iswformed on a forwardly directed arm 70 of the trigger lever, to engage against the top edge of the slide bar 72 as it moves rearwardly, and cause the bar to pivot on the pin 73, that supports its forward end, and tof-be swung slightly downward at its rear end, until stopped by engaging stud 68l and then the bar 72 being shifted rearwardly and downwardly. The connecting link 211 retains the hook 208 at the end of latch bar 207 in position to engage'with sear .stud 209, thus to release sear 64 from hammer 59 each time'the bolt is rotated to locked position. This retentionf'the latch lever 207 6' continues as long as trigger pull is retained. Thus ring will continue with rapidity until pull on the trigger is released and the latch lever 207 is allowed to return to that disengaged position in which it is shown in dash lines in Fig. 5. When pull on the trigger is released, the spring 74 returns slide bar 72 forwardly to its normal position; link 211 causes the hook end of latch lever 207 to be lifted to keep the latch hook 208 free and clear of the sear lug 209. Spring 67Y also returns the bell crank lever 205 to its normal position. When the fully aut0- matic operation is not desired, then the block 215 is shifted on arm 205a of the bell crank forwardly to the position in which it is shown'on Fig. 5. This block This is the semi-automatic operaadjustment can be readily effected by the rie user by the forward or rearward shifting of a lug216 that is formed as a part of block 215 and extends outwardly therefrom through a horizontal slot 217 in the adjacent face plate of the rie, as shown in Figs. l and 8. A spring latch means 218 that is contained in lug 216, as shown in Fig. 8, operates to yieldingly retain the block 215 at one or the other of its two positions ofvadjustment.

It is not the intent that the reciprocal action of the bolt 25 be confined to use of the gas operated means of Fig. 3 herein shown, but that any 'other suitable means be employed that will accomplish the same result. For example, any of the devices shown or described in my copending applications lled under Serial Nos. 754,636, now Patent No. 2,952,088, lor 696,738 may be used.

yIn Figs. l0 through 14, I have illustrated an alternative arrangement of parts whereby the firing mechanism may be selectively set. for either semi-automatic or fully automatic operation. In this modification, the trigger and sear mechanisms are adjustable relative to the hammer and no adjustment of that mechanism which is directly asso-l ciated with the lire controlled rod 99 and lever 100, or equivalents thereof, is necessary.

Also, in this modification the breech bolt 25 and receiver may remain `the same as in the rifle previously described and the same reference numerals as previously used for correspondingparts are applied thereto in these figures.

l The hammer mechanism also remains the same in this modilication and after each firing is returned to cocked position by the same manual or by a similar automatic means, that is, by the knob 38 for manual setting or by contact therewith of the anvil 49, with the actuation of the bolt to its open position.

It is shown in Fig. 10 that the trigger lever here designated'by numeral 70x is pivoted, as at 76x, on the forward end portion of a horizontally mounted slide bar 72b located immediately below and in the plane of the hammer plate 59. This slide bar is mounted on edge along or against the back wall 57 of the enclosing frame structure for certain limited endwise adjustments in opposite directions' that may b'e effected by opposite rotative adjustments of a circular cam 250 that is tixedly mounted on an eccentric pivot shaft 251 that is rotatably mounted in the wall 57. The cam 250 is closely contained in a vertical slot 252 that is formed on and extends upwardly from the rearward end of the slide bar 72b. The pivot shaft 251 extends to the outside of the rifle stock and is there equipped with a thumb lever .256 that may be swung to a forwardly directed position, as indicated in Fig. 10, or swung to arearwardly directed position, as in Fig. 13, thus to shift the entire trigger and selective fire control mechanism to a forward position as in Fig. 10 for fully automatic firing or to a rearward position, as in Fig. 13, for semi-automatic operation.

The hammer plate 59 is formed at its rear edge with a sear engaging shoulder 260 and at its lower edge, diametrically opposite the arm 60, with a projecting stop 261.

The trigger lever 70x is provided at its forward edge andv above the level of the pivot 76x, with a shoulder 76s and mounted in a spring socket 262 formed in an abut- .l ment 263 that is lformed in and as a part ofthetriggerv crassa enclosing frame, is a coiledr spring 264 which, at its outer end, carries a block 26412 that bears against the shoulder 76s and constantly urges the ltrigger lever 70x to the normal position in which it is seen in Fig. 10.

Extended rearwardly from the upper end of the trigger lever 70x, is a lever arm 265. This extends horizontally across and slightly beyond the arm 255 and at its end is pivoted, as at 266 to one end of a sear 267. Between its ends this sear has a pin and horizontal slot connection 268 with the lower end portion of a push pin 269 that extends vertically and slidably through a hole in the forwardly turned upper end portion 271 of the arm 25S. This pin 269 is normally held in a lifted position by a coil spring 273 that is applied about its upper end portion between the outturned spring supporting tiange 271 of the arm 255 and a key 275 applied through the pin. The upper end of pin 269 is rounded and is positioned to be operatively engaged by the lever 100 that is fixed on the rod 99 operated by a reloading mechanism like or corresponding to that of Fig. 3. The upward travel of pin 269 under pressure of spring 273 is limited by a pin or key 275 passing through it to engage against the under side of ange 271.

The arrangement of parts, as shown in Fig. 10, which is for Ifully automatic operation provides that as each cartridge is tired in the rie the rod 99 is rotatably actuated to unlock the bolt. This rotation swings the lever arm 100 downwardly as previously explained. If the adjustment of the trigger mechanism, when the bolt is in its locked position, is for semi-automatic operation, as in Fig. 13, the turning of rod 99 and downward swing of lever arm 100 has no effect on the trigger mechanism because the pin 269 is then positioned out of line with the lever lil. Sear 267 is also out of contact with hammer 59. However, even at this adjustment, the opening action of the bolt 25 causes anvil 49 to cock the hammer in the same way previously explained.

Assuming that an adjustment for fully automatic operation has been made, as in Fig. l0, and the hammer has been manually cocked, it will be understood that this hammer cocking has caused the hammer to be latched by sear 267 and held ready for firing; the hammer shoulder 260 then being engaged `.by the toe of sear 267. The bolt is now rotated to its locked position and lever 100 swings down with the locking to touching contact with the upper end of pin 269. Then, to re the rifle, the user merely pulls on the trigger. This swings the rear end of the trigger arm 265 upwardly as in Fig. 11 and by reason of the pin and slot connection 268 the sear will be disengaged from the hammer shoulder 260 and the hammer thus released and under pull of spring 62 caused to strike the -anvil 49 and re the cartridge. Upon release of the sear 267 from the hammer the cartridge is tired and the bolt is immediately rotated to unlocked position. This rotates rod 99 and swings lever 100 upwardly. Pin 269 is then free to move upwardly and return scar 267 to hammer latching position. Then with the next ring of the cartridge the rod 99 swings lever 100 upwardly and unlocks bolt 25 and moves it rearwardly and in its movement causes the anvil to engage with the hammer arm 60 and again cock the hammer; it being understood that the sear latches the hammer as the bolt is opened and returned. With the return travel of the bolt to its closed position, the rod 99 swings the lever 100 downwardly against the upper end of pin 269 and pushes the pin 269 downward a short distance, and by reason of the pin` and slot connection at 268 between pin and sear, the latter is disengaged from the hammer and the loaded cartridge is caused to be red.

As soon as firing is eiected the reloading is repeated,`

and the reloaded cartridge is likewise red. This cycle of loading and ring is continueduntil the pull on the trigger is released. With release of trigger pull the trigger lever is actuated back to the position of Fig` 1 0 8 bythe pressure of the coiled spring 264 that is disposed` between the upper end of the trigger lever and spring seatingabu'trnent 263.

In Fig. 15, I have shown a semi-automatic mechanism as being equipped with a safety latch 280 that is fixedly mounted at the inner end of a pivot pin 281 that extends to the side face of the rifle may there be equipped with a lever not shown, for swinging the latch between its latched Iposition in a seat 282 formed on the trigger lever arm, as shown, to a released position as shown in its dotted line showing. When latched, the trigger cannot be pulled for tiring.

' Another refinement in the present mechanism resides in the provision of a roller 290 mounted in the top edge of the slide bar 72 as shown in Fig. 5, in rolling contact with reciprocable bolt actuating rod to which limited rotative action in opposite directions is imparted on ring the rifle for unlocking the bolt for reloading and for locking it after loading, a spring loaded hammer, a means movable with the bolt in its opening reciprocation for `actuating the hammer to cockedy position; a selective iire control mechanism comprising a` lever arm extended radially from said bolt actuating rod and arcuately movable with each ybolt locking rotative movement of the rod, a sear for latching said hammer upon its being actuatedto its cocked position by the bolt movement, a slidably adjustable support, a push pin slidably mounted 'by said support for downward actuation by said lever arm, incident to a bolt locking operation, a spring yieldingly urging said push pin yto a raised position, a manual means for selectively adjusting said slidably adjustable support from a position at which said pin is engagable by said lever arm for a fully automatic firing operation, or to a position not operable by said lever arm thus to adapt the mechanism for semi-automatic operation;

2. In abolt action repeating riile including a reciprocally movable and rotatably adjustable bolt, and a reciprocable bolt actuating rod to which limited rotative movements, in opposite directions, are imparted for unlocking and locking the bolt in the automatic rearward and forward reciprocal action thereof, a selective fire control mechanism including a spring loaded hammer, means movable with the rie bolt in its opening movement to actuate the hammer to its cocked position, a sear engagable with the hammer to restrain it in cocked position when so moved, a trigger, a trigger actuated means, operable by initial trigger pull to release the sear for semiautomatic operation and another means, operable by the final rotative action of the bolt actuating rod that effects the bolt locking operation, operable to disengage the sear from the hammer for fully automatic firing, if the trigger and said trigger actuated means is held in pulled position.

3. The combination recited in claim 2 wherein said another means includes a movably adjustable element for selectively rendering said another means effective forV a fully automatic operation under control of the bolt actuating rod or for semi-automatic operation under control of said trigger.

4. The combination recited in claim 2 wherein said trigger actuated means for disengaging the sear from the hammer comprises a slide bar that is movable with trigger pull and wherein said another means comprises a pivoted bell crank lever, a latch lever pivoted to one arm of said bell crank to releasably engage the sear, a link connected with the slide `bar and latch lever for moving said latch lever into sear engaging `and releasing position when said trigger is pulled for firing, and means on the bolt actuating rod engagable `withthe other arm of said bell crank, incident to bolt locking action, to actuate the bell crank and latch lever to disengage the Sear from the hammer for tiring. i

5. I'he combination recited in claim 4 wherein said last mentioned means comprises a lever arm xed to and extending from said bolt actuating rod, and a block adjustable along an arm of the bell crank to be selectively positioned for engagement by said lever arm to effect bell crank actuation, or out of position for actuation of said bell crank.

6. Al combination according to claim 5 wherein said slide bar has a pivotal sliding support at one end and a downwardly yieldable support at its other end, to which said latch lever is connected, and wherein said trigger also has a lug engagable with said bar incident to trigger movement for firing, to actuate said other end of said slide bar downwardly thus to pull said latch lever to its sear releasing position incident to the sear releasing pull initially applied to said slide bar by trigger pull, and whereby the latch lever is lifted to inoperative position 5 with the return of said slide bar'to normal position.

References Cited in the file of this patent UNITED STATES PATENTS

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