US1449650A - Bolt-action firearm - Google Patents

Description

Man. 27, 1-923, 1,449,650

F. F. BURTO ET AL BOLT ACTION FIREARM Filed May 14", 1921. 6 sheets-shect l Mar. 27, 1923,

F. F. BURTON ET AL BOLT ACTION FIREARM Filed May 14, 1921.

6 sheetsshect 2 Mar. 27, 1923,

F. F. BURTON ET AL BOLT ACTION FIREARM Filed May 14, 1921.

6 sheets-sheet Mar. 27, 1923,

BURTO BOLT ACTION Filed May 14 .w Mi 3 ll A M S g g \& $1 m w Rh xiv v Q s 3 \w Mar. 27,.1923.

F. F. BURTON-ET AL BOLT ACTION FIREARM Mar. 27, 1923,

F. F. BURTON ET AL -'BOLT ACTION FIREARM Filed May 14, 1921. 6 sheets-sheet 6 Patented Mar. 27, 1923.

FRANK F. BURTON, or MOUNT CAR-MEL, AND ARTHUR A. RowLEY, or WHITNEY- VILLE, CONNECTICUT, ASSIGNORS To w Cnns nR RPEATING ARMS 00., or NEW HAVEN, CONNECTICUT, a CORPORATION.

BOLT-ACTION FIREARM.

Application filed. May 14,1921. Serial No.69,541.

To all whom it may concem:

Be it known that we, FRArJN F; Bonron and ARTHUR A. Rownnr, citizensv of the United States, residing. respectively, at lv'iount Carmel and at W hitneyville, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Bolt-Action Firearms; and we do hereby declare the following. when taken in connection with the accompanying drawings and the characters of reference marked thereon, to he a full, clear, and exact descrip-.

tion of the same, and which said drawings constitute part of this application, and represent, in-

Fig. 1 a view in right hand side elevation of a bolt-action firearm embodying our in vention.

Fig. 2 an enlarged broken view thereof in right hand side elevation.

3 an enlarged broken view in right hand side elevation of the receiver and learrel unit with the attached magazine holder,

and with the action partly open.

Fig. a similar view of the stock unit.

Fig. 5 a view corresponding to Fig. 2 partly in vertical central longitudinal section on the line of Fig. 6.

Fig. 6 a plan view corresponding to Fig;

2 partly in horizontal section on the line 6tl of Fig. 2.

Fig. 7 a view corresponding to F lg. 5 with the magazine removed, the magazine holder not in section and the gun cocked.

8 a view in transverse section on the Fig. 15 a similar plan view of the boltunit.

16 a similar view thereof in right hand side elevation with the handle lifted part way.

Fig. 17 a similar reverse plan view thereof.

Fig. 18 a similar plan view thereof with the firing pin head.

Fig. 22 a similar view thereof in side elevation.

Fig. 23 a similar view thereof in front end elevation. Fig. 24: a detached enlarged plan view of the firing pin body.

Fig. 25 a similar view thereof in side elevation.

Fig. 26 a similar view thereof in front end elevation. I

27 a detached enlarged plan view of the 'bolt sleeve. i

F 28 a similar view thereof in side elevation. i

Fig. 29 a similar view thereof in rear end elevation.

Fig. 30 aidetachcd enlarged plan view of the bolt.

Fig. 31 asimilar view thereof in side elevation.

Fig. 32 a similar view thereof in front end elevation. I

Fig. a similar view in side elevation of the firing-pin point.

Fig. 34: a similar view thereof in rear end elevation.

Fig.35 similar view in perspective of the left hand extractor.

Fig. 36 a detached enlarged plan view of' Fig. 42 a similar plan view of the elevation nut spring.

Fig. 43 a similar view thereof in rear elevation;

Fig. 44 a detached enlarged view in longitudinal elevation of the operating handle.

Fig. a5 a detached enlarged view in per spective of the magazine filler.

Our invention relates to an improvement in bolt-action box-magazine firearms of the class having a non-rotatable longitudinally slidable breech-bolt and a rotatable locking-sleeve and handle thereon, the object being to produce a firearm of the class described constructed with special reference to simplicity f manufacture, safety in use, accuracy and ease of operation.

lVith these ends in view our invention consists in a firearm of the class described characterized by certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

In carrying out our invention as herein shown, we construct a firearm having a two-piece firing-pin comprising a body 46 and a point 47. The body 46 is cylindrical and is provided at its forward end with an integral seniicylindrical, forwardly projecting, coupling-extension Q8. The point 47 comprises a short,. substantially cylindrical body 49 and a forwardly projecting striker 50. The point body t9 has on its rear face an integral rearwardly' projecting cylindrical coupling extension 51 formed at its base with a circumferential groove 52. The flat face of the body extension 48 is provided with two concentric communicating semicylindrical cuts forming a recess 53 adapted t receive the extension 51 and thus couple the point 47 rotatably to the body 46. The rear portion of the striker 50 is of rectangular cross-section, tapering forwardly to the cylindrical front portion thereof. The body 49 of the point 47 is formed with a transverse sear-notch 54 and shoulders for limiting its forward travel.

The firing pin body 46 has a cylindrical bore 56 extending longitudinally forward from its rear end nearly its entire length, within which is housed the helical main spring 57 with its forward end abutting against the front wall of the bore 56 and its rear end against a transverse pin 58 which passes through two diametrally located longitudinal slots 59 in the rear portion of the body 46. Each of the slots 59 is intersected at the front end of its left hand side by a lateral detent slot 60, the pin 58 and the slots 59 and 60 being so arranged that when the firing pin body is retracted against the tension of the spring 57 and reaches its rearmost position relative to the pin 58 it may be rotated to the right whereby the pin '58 will enter the detent slots 60 and will be held there against accidental dislocation by projections 61 located between the slots 59 and the slots 60.

Upon the rear end of the body 46 is mounted a forwardly open, substantially cylindrical hollow head 62 terminating at its rear end in a peripherally knurled grip 63 and having its forward edge provided with a pair of integral forwardly projecting, diametrally located teeth 64;. The head 62 is fastened to the body d6 by means of a transverse pm 65.

The main spring abutment pin 58 is mounted transversely in the rear end. of the breech bolt 66 within which the firing pin is housed in a combined bore and slot 67 which conforms to the external contour of the firing pin and is so located and oriented that in its extreme forward p sition the point of the striker 50 is flush with the flat extreme forward surface 68 of the bolt. The point a? of the firing pin is, prevented from rotating relative to the bolt by the engagement of the rectangular rear portion of the striker 50 with the walls of the corresponding conformable portion of the bore 67.

The breech bolt 66 comprises a front portion 69 which is in external form a cylinder of which a little less than half is cut away t form a fiat bottom face 70 intersecting the middle portion of the com bined bore and slot 67 and thus exposing the rear portion of the firing pin point which bears the sear notch 5a thereof. At the forward end of the face 70 is a centrally located. longitudinal, depending loading lug 71 and immediately to the left thereof the longitudinal ejector clearance groove 72. Just above the face 70 intersecting the front face 68 and the cylindrical outer surface of the bolt-body are the two diametrally located, longitudinal. extractor slots 73. In the front face 66 of the breech bolt is a cartridge head receiving recess 74;, intersected by the forward end of the bore 67 and communicating with the left hand extractor slot 73 by a short transverse slot- 75 (Fig. 32). Each of the extractors is mounted in its respective slot on a vertical pivot 76 passing through a correspondiinr hole 77 about midway of the length of the extractor. Each extractor consists of fiat piece of metal having a long; slightly curved uter face and a strongly triply curved inner face forming between them slender front and rear extensions and a broad central portion in which is lo ated the hole 77.

The front extension of the right hand ezv tractor 78 is provided with a hook-like head 79 of approximately double the thickness of the rest of the extractor. the rear face of which justclears the front face 66 of the breech bolt and overhangs the cartridge head recess 74 thereof. The front extension of the left hand extractor 80 is provided with a hook-like head 81 which rests in the slot 75 in the front end of the breech-bolt and is notched at its inner corner as at 82 to grip the rim of acartridge head located in the recess 74;. In each of the slots 73 near the rear thereof is a recess 83 in which is located a helical extractor-actuatingspring 84: which tends to push the rear end of the extractor outward and hence holds the extractor heads yieldingly against a cartridge head lying between them.

V The rear portion 85 of the breech bolt is acylinder integral and coaxial with the front portion 69 butof less diameter sothat a rearwardly facingsemi-annular shoulder 86 is formed between them. The bore 67 extends throughout the rear portion 85 and houses the firing pin body a6. Near the extreme rear end are a pair of diametral transverse holes 87 to receive the main spring abutment pin 58. Near, the front end of the rear portion 85 of the breech bolt is a segmental slot 88. i

' Upon the cylindrical outer surface of the rear portion 85 of the breech bolt and abutting with its forward end against the shoulder 86 is rotatably mounted a sleeve 89 .the rear edge of which formed with a pair of safety cam notches90 corresponding to the teeth 6 1 of the firing pin head and coacting therewith, when the sleeve is rotated, to force the firing pin rearward against the tension of the main spring and thus to withdraw the nose of the firing pin withinthe u breech bolt and out of possible contact with any cartridge. The rear edge of the sleeve 89 is also provided with a pair of detent notches 91 similar to but shallower than the notches 90 wherewith the teeth coact in another position of the sleeve 89 to retain the same yieldingly in position. The for: ward outer surface of the sleeve is cut away to form a flat combined clearance and'cam surface 92 and a longitudinal locking groove 93. 5

The sleeve .89 is also formed at, its forward end with an integral, radially extending, bolt-locking stud 9st havinga central radial threaded bore 95 which receives the,

threaded inner end of a radially positioned operating handle 96, the extreme inner end of which 18 provided with a cvl ndrical stud 9]" fitting into the slot 88 of the breech-bolt whereby the handle 96 and sleeve 89 are.

pr evented from longitudinal and permitted rotary motion relative to the bolt.

The breech-bolt unit as described consist? ing of the breechbolt, firing pinhfiring pin head, sleeve and handle, is mounted inra receiver 98which, as herein shownthoughnot so limited, is.an integral, rearward extension of thebarrel 99'.

. .1The receiver98is cutaway for about the:

forward half of its length above a horizontal plane lying a trifie'below the axis of the receiver to form a loading and ejection opening 100 which intersects at its forward lower corners a pair ,of extractor clearance s10ts 101 formed inthe rear endofthe bar rel adjacent to the cartridge chamber 102 thereof for the receptionof the heads ofthe extractors 78 and 80 when the bolt is closed.

The receiver isfortned internally to conforinto the external surface of the bolt unit,- the rear portion of the receiver having a cylindrical bore 103, within whichthe firing pin head 62, the sleeve 89 and the rear end of the forward portion 69 of the breech bolt, which are all of. substantially like, diameter, are housed when the bolt is closed -and-the front portion of the receiver having a flat upper surface 10 1 forming a guide for the bolt, and preventing rotation of the sameby contact with the flat bottom face/('0 thereof,

The rear portion of the receiver is further provided on its right hand side with a vertical-bolt locking slot 105, aihorizontal guidewayslot 106 and connecting these an arcuate priimary-eXtract-ion-cam slot 107 in which,

the stud 94 of the sleeve 89v travels, being turned down int-o the, slot 105 to lock the closed bolt, beingturne'd up through .the cam slot 107 to withdraw the bolt-power fully a short distance thus starting the, shell of a discharged cartridge from the chamber, and being withdrawn along the slot 106 to open the bolt or to withdrawthe bolt from the gun, asthe slot 106 intersects the ex treme rear face ofthe receiver. 1 H

In the outer surface of the receiver wall is cut a longitudinal, groove 108 located about, 45 .up ,from the bottom line of the receiver and terminating at its rea'rend in a slot 109 passing radially through the wall,

of the receiver. A wirespring 110 is rigidly held in the groove by..forcing in a portion of the walls of the groove upon it. The rear end of thewire is formed into an are 111 the crest. of which projects through the,,.

slot 109 into the;bore 103 of the receiver forming a yielding bolt-handle lock.

Vhen the breech bolt is closed by pushing the handle forward so that the stud 9t moves to the forward. end .of the slot 106,,

the flat combined clearance andcanisurface 92 of the sleeve 89, engages the arc 111.; and upon the-stud 94 being turned downward through theslot 107 by rotating the sleeve,

the spring are 111 .is. .push edv outwardly and .The front portion of .thei receivei is pierced vertically by the rectangular magazine welll12 which communicateswith and forms a continuation of the magazine chamber of the box-like magazine holder 113 yieldingly locking the sleeve in;

which is attached to the under side of the receiver by means of screws 114 and 115 passing through horizontal lugs 116 and 117 formed at the top of the front and rear walls respectively of the magazine holder and seated in corresponding recesses 118 out in the under surface of the receiver and barrel adjacent to the well 112. The front screw 114 is screwed into a threaded hole 119 in the bottom of the barrel 99. The rear screw 115 passes through a hole 120 in the bottom of a rectangular slot 121 interposed between the well 112 and the bore 103, and is screwed into a threaded hole 122 in the bottom of an ejector block 123 positioned in and completely filling the slot 121. On the upper surface of the block 123 is the lug-like upstanding ejector 124 which is-housed in the ejector clearance groove 72 in the under face of the bolt and is uncovered by the bolt when the same has nearly reached the rearward limit of its excursion.

In the chamber of the magazine holder 113 is positioned a box magazine such as is described in United States Patent #1323,- 063 to Thomas C. Johnson and Frederick L. Humiston, or such as is described in United States Patent #1.331,155 to Thomas C. Johnson with the additional feature of being provided when desired with. a shorter follower and with the hollow, sheet-metal, segmental filler 125 which is rigidly fastened into the magazine by soldering, riveting, welding or in some equivalent way. By this construction we are enabled in a very simple manner to adapt different specimens of one style and external size of box magazine to hold and deliver satisfactorily cartridges of different lengths.

The magazine holder comprises end walls which are bent forwardly and rearwardly respectively to form the attachment lugs 116 and 117 and are each formed on their inner side with a central longitudinal rib, leaving clearance grooves for the projecting edges'of the side walls of the magazine. The material of .the right hand side wall 126 of the magazine holder is forced out to form a clearance channel 128 to permit the stop 129 of the magazine to pass when the latter is inserted. As the magazine is pushed into position, the stop rides over a combined cam and catch 130 formed in a flat spring 131 riveted at its forward end to the side wall 126 of the magazine holder. As the stop passes the cam the latter snaps back under it. holding the magazine in place until it is released by a push on the rear end of the spring 131 which extends beyond the rear wall of the holder, when the magazine may be withdrawn.

The front and rear walls of the magazine holder 113 are rigidly attached to the side walls thereof by means of integral lugs 132 projecting from the lateral edges of the end walls, entering corresponding slots near the front and rear edges of the side walls and being riveted down thereupon. Upon the bottom end of the magazine holder is rigidly mounted an elongated cup-like bottom piece 133 having its floor perforated to admit the magazine and having its outside bottom corners and edges rounded to prevent damage as they project from the stock of the arm. The rounded outer contour of the bottom piece of the depending magazine holder guides the holder in the corresponding aperture of the stock when the gun is being assembled after being taken down and prevents the holder from jamming therein.

The combined receiver and barrel are mounted in a one-piece stock and forearm 134 having a longitudinal groove 135 in the upper surface thereof for the reception of the barrel and receiver. In the under side of the barrel is an undercut transverse dovetail groove 136 in which is mounted a block 137 correspondingly formed at its upper end and provided at its lower end with a vertical internally threaded hole 138 for the reception of a take-down screw 139 mounted in the stock. The block 137 is further provided at its bottom end with an integral rearwardly extending lug 140. In the bottom of the groove 135 of the stock is a recess 141 for the reception of the block 137. The takedown screw 139 is mounted loosely in a bushing 142 which is rigidly mounted in the floor of the recess 141. The said recess is undercut as at 143 to receive the lug and the parts are so proportioned and arranged that after the screw 139 has been withdrawn from the hole 138 the barrel and receiver must be moved bodily forward relative to the stock to free the lug 140 from the under cut 143 before the gun can be taken down by lifting the block 137 from the recess 141. This becomes a safety feature of the aim in combination with the fact that a recess 144 is provided in the wall of the groove 135 to receive the bolt handle 96 when the gun is closed thus preventing the forward movement of the receiver relative to the stock unless the bolt is open, so that the gun cannot be taken down unless the firing pin nose is retracted within the bolt and the gun is uncocked. i

A rectangular aperture 145 in the stock provides space for the magazine holder and magazine which pass through the stock and. protrude from the bottom thereof. The magazine catch actuating button 146 is mounted by means of a long stem 147 in a bushing 148 rigidly mounted in a transverse hole 149 bored through the left hand wall of a recess in the stock comunicating with the rear end of the magazine holder aper ture 14:5 and providing clearance for the magazine catch spring 131. The button 146 is kept from falling out by a spring'retai'ri ing ring 150 mounted in a groove 151 en'- circling the stem.

The'trigger 152 having a spring 152 and an integral sear arm 153 is pivotally mounted in a slot 154: in the stock by means ofa transverse pin 155. Near the forward end of the sear arm 153 is an upstanding combined sear and bolt stop '156 the rear upper corner of which is transversely notched to form the rearwardly facing sear nose/157 which coacts with the forwardly facing rear wall of the sear notch 54 of the firing pin 45 to cock the gun when the bolt is moved forward. The front upper corner of the combined sea-r and bolt stop 156 coacts with the rear face of the loading lug 71 of the bolt to prevent withdrawal of the latter from the gun unless the trigger be held back. When the gun is taken down,the trigger and sear are removed from the receiver together with the stock and means must be provided to keep the bolt from coming out of the receiver unless purposely removed therefrom.

To this end, the left hand extractor'80 is provided on the outer surface of its rear extension with a detent-cam 158 and a shallow recess 159 is formed in the inner surface of the left hand receiver wall. The rear face of the cam 158and the rear face 160 of the recess 159 slope as shown. When the bolt is drawn rearwardly past the'pos'ition in which it is ordinarily stopped by the stop 156, it is stopped by the contact or cam 158 with the rear face 160 of the recess 159 but a slight jerk o, the bolt will cause the face 160 to ride the cam down against the tension of the extractor spring Sathu's liberating the bolt.

A transverse undercut slot 161 is formed in the upper surface of the receiver the rear of the loading and'ejection opening in which is mounted a rear sight.

' sight as herein shown consists of a rear sight frame comprising a horizontal" body 163 formed at each end with an'integral, up standing, sight-slide-guide lug 165. he body 163 is further formed at the bottom thereof with a transverse dovetail 164 adapted to fit tightly into the slot 161 of thereceiver.

Each of the lugs 165 is formed on its inner face with a vertical groove 166 for the reception of a vertically adjustableslide 167 positioned in and guided by the grooves 166. The slide 167 is provided with a sighting aperture 168 in its upper portion while'its lower part is formed with a screw thread 169 which enters the complementary female thread 170 of the knurled elevation nut 171 which is housed in a pair of horizontal slots 172 opening out of the bottom of the space between the lugs 165 and is held against vertical displacement by thewalls of the said slots and against longitudinal displacement bythe'slide 167 which it surrounds.

'The central perforation of the nut 171 is counterbored at its lower end as at 173 to receive an annular spring 17 1 provided with a p'a-inof diametrically opposite external lugs1'75 which fit int'o'the respective ends of ayertieally disposed slot 176 in the body 163' whicli' also provides clearance for the bottolin end of the slide 167 when the latter is in its lowest position. "The spring 1741s curved upwardly into an arch having the lugs1'l as abutmeiits and midway between them is'fo rmedwith'a pair of small upward bows 17S which coact-with notches 179 arranged in diametral pairs in the bottom face'o'f the 1'1ut'171 whereby the latter is yieldingly held againstaccidental rotation and at the same time a click is provided whereby' the vertical adjustment of the slide may be gauged by sound or feeling. if

Thespeci'fic box-magazine herein shown and described is not herein claimed, but is made the subject of a separate application filed Nov. 3, 1921, Serial No. 512,622.

The specific rear-sight herein shown and described is not herein'claimed, but is made the subject ofaseparate application filed Nov. 3, "19 21,"Serial No. 512,623.

W sla n 1. In abblt -action, take-down firearm, the combinatien'with'a stock-unit organized to behandled one piece and comp-rising a stoclrfa a sear, of a receiveralso organized to be handled as one .U c ivv-..- .,ii i piece and comprising a receiver, a barrel e p e aratsad n e t v' wit h' pairs of interlocking locking-members, ofwhichone pairis po'sitionedto co-o-perate the b'reech bolt to'ho'ld both pairs of locking meniber s in locking-engagement when"" he breech-bolt is closed and locked."

"2. In a bolt-action, take-down firearm, the combination with afstock-unit organized to be handled as one piece and comprising a stock, a trigger and a sear; of a receiveralso e'rgiinized to be handled as one piece and comprising a receiver, a barrel and a breeeh-beltfthe said units being respectively provided with interlockinglockin'g-mein ersand 'relatively movable longitudinally for being locked and unlocked, andthe" said locking members being controlled bythe said breech-bolt, which, when in its closed and locked position, coacts with the said stocktdprevent the longitudinal movement of "the units in the direction of unlecking.

"3'. Ina bolt-action, take-down firearm, the combination with a stock-unit organized to be handled as one piece and comprising a stock, a trigger and a sear; of a receiverunit also organized to be handled as one piece and comprising a receiver, a barrel and a breech-bolt, the said units being respectively provided with elements of locking means preventing their separation when the breech-bolt is closed and locked, and the said means including a block depending from the receiver-unit and having a. rearwardly-projecting lug coacting with an under-cut recess in the stock-unit, and also including a handle on the breech-bolt coacting with a notch in the said stock.

4. In a bolt-action, take-down firearm, the combination with a stoclcunit organized to be handled as one piece and comprising a stock, a trigger and a sear, and the said stock being provided with an undercut recess and with a laterally-opening locking-notch located to the rear thereof; of a receiver-unit organized to be handled as one piece and comprising a. receiver, a barrel integral therewith, a bolt having a handle, and a block depending from the said barrel and formed with a rearward projection which enters the undercut of the said recess in the stock to prevent the separation of the stock and barrel except'after the relative longitudinal displacement of the two units, which must be preceded by the disengagement of the handle from the notch in the stock, whereby the said block, recess, bolt-handle and notch prevent the two separately organized units from being taken apart when the gun is cocked and in condition to shoot.

5. A firearm having a receiver; a box-like magazine holder attached thereto, open at the top and comprising forwardly curved front and rear walls, substantially flat side walls rigidly attached thereto, one of the said side walls having a perforated magazine-stop clearance-channel, and an elongated cup shaped bottom-piece having rounded bottom edges and corners rigidly attached to the said side walls, a magazine removably located in the said holder and having a stop positioned in the said channel; and a combined magazine-catch and spring mounted upon the said magazine-holder and coacting with the said stop throughthe perforation in the wall of the said channel to retain the said magazine removably in place.

6. In a take-down bolt-action box-magazine firearm, the combination with a receiver having rigidly attached thereto a barrel, and a box-like magazine-holder open at the top and at the bottom and provided with a rigidly attached bottom guard comprising an upturned, sheet-metal collar having rounded corners and edges; of a stock adapted to be detachabl'y secured to the said barrel and having a recess for the reception of the said magazine-holder which is guided into the said recess by the rounded corners and edges of its guard.

7. In a bolt-action firearm, the combination with a non-rotatable bolt of a sleeve rotatably mounted thereupon; and a separately formed handle rigidly mounted in the said sleeve and having means adapted to coact with the said bolt to prevent relative longitudinal motion of the bolt and the sleeve and to permit partial relative rotation thereof.

8. In a bolt-action firearm, the combination with a receiver of a non-rotatable bolt mounted therein; a sleeve rotatably mounted on the said bolt and having an integral locking-stud adapted to coact with the said receiver to lock and unlock the said bolt thereinupon rotation of the said sleeve; and a combined operating-handle and sleeve and-bolt coupling mounted on the said sleeve and adpated to coact with the said bolt to prevent longitudinal and to permit rotational relative motion of the said bolt and: sleeve.

9. In a bolt-action firearm, the combination with areceiver of a bolt housed therein; a firing-pin housed in the said bolt and comprising a rear portion and a front portion coupled for a relative rotational motion, the said. front portion being provided with a striker and a sear notch; a main spring housed in the said rear portion of the firingpin; and sear-and-trigger mechanism adapted to coact with the said sear-notch in the front portion of the firing pin.

10. In a bolt-action firearm, the combination with a two part firing-pin comprising a front portion and a rear portion coupled for relative rotation; of a sear-notch formed in the saidfront portion; and means for housing and operating the said firing-pin, including a sear for coaction with the said sear-notch.

11. In a bolt-action firearm, the combination with a barrel of a receiver integral therewith, formed with an integral flat topped bolt-guide, a bolt housed in the said receiver, having a longitudinal bore, and having its forward portion cut away to eX- pose a portion of the said bore and to adapt the said bolt to coact with the said bolt guide to prevent the bolt from rotating; a bolt-operating handle rotatably mounted upon the said bolt and coacting with the said receiver to lock and unlock the said bolt; a firing-pin housed in the said bore and comprising a front portion having a striker and a sear-notch and a rear portion rotatably coupled to the said front portion which is held against rotation by the walls of the said bore, a main spring housed with in the said rear portion; a head mounted upon the said rear portion for the manipulation of the firing-pin; and sear-ancltrigger mechanism adapted to coact with the said sear-notch and being given access there to through the said cutting away of the bolt.

12. In a bolt action firearm, the combina- 1 tion with a receiver of a bolt non-rotatably mownted therein; a hollow firing-pin mounted in the said bolt and having its side Walls formed with longitudinal slots provided at their forward ends with lateral notches, a main spring housed in the rear portion of the said firing-pin, abutting at its forward end against the said firing-pin, and an abutment-pin transversely mounted in the said bolt, passing through the said longitudinal slots in the side walls of the said firing-pin and positioned in the rear end of the said bolt, whereby when the said firing-pin is retracted longitudinally against the tension of the said main spring it may be rotated until the said abutment-pin enters the said lateral notches and thus prevents the forward motion of the said pin.

13. In a bolt-action firearm, the combination with a receiver having in one of its side walls a longitudinal groove which terminates at one end in a slot extending transversely through the said wall; of a substantially cylindrical bolt-unit mounted in the said receiver for longitudinal motion therein and having a cylindrical member rotatable for locking and unlocking the bolt, the said member having a longitudinal groove therein; and a spring detent comprising a straight portion by which it is mounted in the said groove in the receiver and a curved portion which extends through the said transverse slot in the receiver to coact with the groove in the rotatable member of the bolt-unit to hold the same yieldingly in the bolt-locking position thereof.

In testimony whereof, we have signed this specification in the presence of two subscril ing witnesses.

FRANK F. BURTON. ARTHUR A. ROWLEY.

Witnesses:

ERIK S. PALMER, AMos DICKERMAN.

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