US 954797 A
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Description (OCR text may contain errors)
- G. HAMMOND.
APPLICATION FILED NOV. 4, 1907.
Patented Apr. 12, 1910.
6 BEEET8SHEET 1.
, G. HAMMOND.
AUTOMATIC GUN. nrruoumx FILED m. 4, 1901.
Patented Apr. 12, 1910.
651mm 81mm" 2.
APPLIOATION FILED NOV. 4,
Patented Apr. 12, 1910.
8 SHEETS-SHEET 3.
a m m M w a CLAQW G. HAMMOND.v
APPLIOATION FILED NOV. 4, 1907.
Patented Apr. 12, 1910.
W Z Q M G. HAMMOND.
APPLICATION FILED NOV. 4, 1907.
Patented Apr. 12, 1910.
6 SHEETS-SHEET 5.
Grant flr n' wm z wmf E I l 4 1 1 I 1 J v v 1 4 y l, Ill/I l II/ I 4 I wmwmo parts of the bolt-operating lever.
- place in the stock.
.vation of the breech-bolt.
UNITED sTATEsrATENT OFFICE.
GRANT HAMMOND, OF HARTFORD, CONNECTICUT, ASSIGNO R OF ONE-HALF TO THOMAS DARLINGTON, OF NEW YORK, N. Y.
Application filed November 4, 1907.
To all whom it may concern:
Be it known that I, GRANT HAMMOND, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented new and usefulImprovements in Automatic Guns, of which the following is a specification.
My invention relates to certain new and useful improvements in automatic guns and to guns which are convertible for automatic and repeating purposes, and my invention consists of the parts and the constructions, arrangements and combinations of parts which I will hereinafter describe and claim.
In the accompanying drawings forming a part of this specification in which similar reference characters indicate like parts in the several views Figure 1 represents a side elevation of an automatic gun embodying my invent-ion. Fig. 2 is an enlarged side elevation of the gun action removed from the stock. Fig. 3 is an enlarged longitudinal sectional view of the gun action in Fig. 4: is a longitudinal vertical section of the receiver. Fig. 5 is a longitudinal horizontal section of the re Fig. 6 is an end view of the receiver. Fig. 7 is a cross sectional view on the line 4-4 of Fig. 4. Fig. 8 is a top plan view of the breech-bolt and connected parts. Fig. 9 is a. longitudinal sectional view of the breech-bolt and its cap, showing the firingbolt in elevation: Fig. lO-is a side elevation of the bolt-operating lever. Fig. 11 is a side elevation and end view of the dog, 91.
Figs. 12, 13 and 14 are views of the'breech bolt cap. Fig. 15 is a plan view of the ex- -Fi 16 is a perspective view of the breech-bolt detached. Fig. 17 is a. side ele- Fig. 18' is a longitudinal sectional view of .the rear end of the gas cylinder showing a part ofthe piston rod and the means for looking it to the main-operating lever. Fig. 19 is a sectional view of the detent for locking the jointed Fig. 20 is an edge view of one of the members of the bolt-operating lever. Fig. 21 is a. view from the inner side of the same. Fig. 22 is a per-' spective view of the dog, 100. Figs. 23, 24 and 25 are details of the magazine. Fig. 26 is a'plan view ofthe gas cylinder and connected parts. Fig; 27 is a plan view of the iston removed from the cylinder. Fig; 28
1s a. sectional view of the automatic devices Specification of Letters Patent.
is suitable for a cated, which gun ias a metal mam-frame or Patented Apr. 12, 1910..
Serial No. 400,527.
and part of the breech bolt. Fig. 29 is a cross sectional view on the line 2828 of Fig. 28. Fig. 30 is a sectional view of t e lubricator. Fi 31' is a sectional view on the line yy oi Fig. 28. Fig. 32 is a detail of the upper portion of the magazine. Fig. 33 is a plan view of the rear part of the magazine, showing the dog, 100.
In the accompanying drawings I illustrate the salient features of the present invention in connection with a gun which employs a longitudinally reciprocating breech-bolt said gun being adapted for either single or magazine firing, the purpose being to convert such a gun into what is known as an automatic gun wherein the expansive force of the gases from the exploded charge of powder is utilized to retract the breech-bolt and automatically cock the firing-bolt and place the trigger mechanism so that the gun maybe successively fired by the simple pulling of the trigger as the cartridges are fitted into the breech and into the range of action of the breech-bolt and its contained firing-bolt.
The gun herein employed for illustrative purposes is an improvement on and follows more or less closely the construction of the automatic gun described-in myformer application Serial Number 356,996 filed Feby. 12, 1907 and the magazine shown, described, and claimed in my former application, Se rial Number 348,057, filed December 15-, .1906; my urpose in illustrating this latter gun is to s ow how readily the present improvements may be applied thereto to convert said gun into one of theautomatic type. I-desire to state, however, that the present invention is not restricted to the style of gun shown or to any particular typejof an or style of operating breech-bolt,- and Its adjuncts, but is to be considered largely as an automatic attachment, for in the case of any of thewell known repeating rifles or imagezine guns, I can readily supply said guns with the present invention an thus convert them 'intoautoinatic guns.
Referring now to the gun shown .1, 2 and 3 wherein sufiicient of the gun mechanism is disclosed to make the present invention understood, A indicates a stock such as m of the character-indr receiver B into the f orward end of which the barrel of the gun 1s appropriately secured. Formilitary or other purposes the stock may in Figs.
be extended beneath the barrel to approximately the front end thereof; and to protect the hands of the operator from undue heat by reason of rapid or continuous firing, the wooden cap piece C may be fitted upon the top of the rear portion of the barrel, the whole being held together by appropriate split-bands D or equivalent devices.
The breech-bolt, 1, is slidably mounted in the receiver and at its forward end it is provided with lugs 2 which slidably fit the longitudinal grooves 3 which are usually formed along the inner sides of the receiver to accurately guide the breech-bolt in its sliding movement after said bolt has been partially turned-say about a quarter of a circleto unlock it, said longitudinal grooves connecting at their forward ends with the transverse or canrgrooves 4 behind the shoulders of which the lugs 2 engage when said lugs are brought into register with the camgrooves and the bolt is turned, as in my aforesaid prior application, 348,057. The breech bolt is shown in Figs. 3, 8, 16 and 17 as having its rear portion provided with semispherical cavities or depressions 5 adapted to receive corresponding semi-spherical or like projections 6 formed on or other wise made rigid with the short arm 7 projecting from the hub or sleeve 8 on the main operating lever E whereby when this lever is turned on its fulcrum in one direction the projections 6 successively engage the cavities and thereby cause the breech-bolt to be accurately turned to bring the lugs 2 into registcr with the longitudlnal grooves 3 on the inner sides of the receiver to allow said boltto be now retracted by a straight rearward pull on the lever E; when the lever is moved in the other direction, after the bolt has been pushed to substantially the limit of its forward movement in the receiver, and said lever is turned upon its axis in a direction the reverse of that first above mentioned, its projections 6 successively engage the cavities 5 in the breech-bolt "and thereby cause the bolt to rotate to bring the lugs 2 into engage ment behind the shoulders of the transverse grooves a which operation is well known in this art and is fully disclosed in my former application, 348,057.
a The rear portion of the receiver is milled out or otherwise provided with a chamber 9 the righthand wall of which is made with a lug 10 while the upper wall is provided with a lug or stop 11. The rear face of the receiver has -a circular opening 12 to receive the breech -bolt, from which opening are radial-extensions 13 to receive the lugs 2 on the breech --bolt. Thus in removing the breech-bolt from. the receiver said bolt is pulled back until the lug 2 on the right-hand side thereof strikes the lug orstop 10, when the bolt is given a quarter-turn or until stopped by a pin or stop 14 to bring the lugs into register with the radial openings 13 when the bolt may be pulled out of the receiver. In replacing the breech bolt, the lugs 2-tl1creof are brought into register with the radial openings 13 and the bolt is shoved forward until the upper lug 2 strikes the lug 11 when the bolt is given a quarter turn to bring its lugs in line with the longitudinal grooves in the sides of the receiver after which the bolt is seated and locked, as before described, the extractor hereinafter de scribed, at all times sliding in its channel or groove in the left side of the receiver.
\Vithin the breech-bolt is slidably mounted the firing bolt, 15, having projecting vertically from its under side a fin, 16, which is adapted toslidably operate in a channel formed in the breech-bolt cap 17, said capbeing adapted to have a sliding movement upon the rear end of the receiver and to have the rear end of the breech-bolt detachably secured to it. In the present case the connection consists in forming the cap, 17, with a tubular forward extension 18, the outer portion of which is formed with left-hand threads, 19 ;:the rear end of the breech-bolt fits over the tubular extension 18 of the cap, and is provided with left hand threads 20 on its lnterior forward of the rear end whereby the bolt may be screwed into the tubular extension of the cap piece, to operate as I will presently describe. As shown in Figs. 13 and '14, the front end of the cap piece 17, is formed with a single spiral thread or surface 21 corresponding with the pitch of the threads 19 and terminating in a shoulder 22, at its highest point; the rear end of the breech-bolt is likewise formed into a' single spiral thread or surface 23, (Fig. 16) terminating in a shoulder 24, at its highest point, which is designed to come in contact or-locking engagement with the said shoulder 22, on the cap to prevent, the breechbolt being turned too far. From this de scription it will be apparent that when the breech-bolt is screwed. upon the threaded end of the tubular extension, 18, the spiral or inclined rear end of the breech bolt is inl'oose contact. withthe corresponding front end of the cap-piece, the shoulders 22 and 24- being separated, but when the breech-bolt is axially turned, by the lever E and the lugs Gand sockets 5, to unlock it from the cam" lugs 4 at the forward end of the receiver, the said bolt screws slightly upon the tubular exten sion and the cam or spiral surface 23'on the rear end of the bolt rides in contact witl i't'he I corresponding surface'21 on the front end of the cap=piece to allowfor the slight jrear J ward movement of theubreeclpbolt onthe' tubular extension, thereby drawing'the irear end of the breech bolt, into close and intimate contact with the front end of the capwere? rigidwith a post or stud 2 8 projecting from one of its sides and forming the journal for the hub of the operating lever, E, on which pin or stud the lever turns as an axis, the hub of the lever being formed or provided with a rearwardly extending flange 29, a
portion of which between the points w-m" being substantially concentric with the axis of the lever to allow said lever a partial axial movement rearwardly before the portion of said flange, thatbetween the points aw" and which forms the' cocking cam of the lever operates to pull the firing pin rear- .wardly so that the front end of the pin cannot contact-with the primer in forming the shell into the breech of the gun.
The joperating lever E is, in the present instance, formed of two parts pivotally oined by a bolt, one of said parts 31, carrying the ,cocking cam, before mentioned, and the other part 32 carrying the knob or handle, 33 by which the operation of the lever is facilitated. The part 32 of said lever has a socket lengthwise of it adapted to receive the rear end of the piston rod 34, of the automatic attachment which I will presently describe, when the said attachment is in use and the part, 32, of the lever E is in the position shown in Figs. 1 and 2 said part, 32, of the lever having, a notch 35, in the periphery of its head portion adapted to be engaged by a spring-pressed pin 36 in the part 31 of the lever when the two papts of said lever are brought substantially into line, as in Fig. 10, which is the position of x the lever when the automatic'features are thrown out of action and the gun is used as a repeater.
One of the parts, 32, of the lever E is formed with an elongated hole .37 in which the pivot pin 38 operates loosely to prevent strain on the piston rod of the hereinafter describedv automatic attachment, and tq preserve the alinement of said rod, said part, 32, having an inwardly extending flange 39 on its rear face adapted to work in contact with an arc-face on the lowerend of the other part, 31, of said lever when the lever is bent into the position shown in Fig. 2. The end of the flange, 39, also forms a shoulder 40 which coacts with a similar shoulder 41 on theother arm of the lever to insure the proper -alinement of the parts of the lever when the lever is in the condition ter.
shown in Fig. 10. This insures, also, the automatic engagement of the spring-pressed pin 36, with the lever arm 32.
Mounted axially in the knob 33, of the bolt-operatinglever E, is a spring pressed pin 42, the inner end of which is shown beveled toadapt it to be engaged by the beveled rear end of the piston rod 34, of the automatic attachment, said piston rod having a notch into engagement with which the springpressed pin 42 engages, the construction forming a releasable detent mechanism between the bolt-operating lever and the piston rod of the automatic attachment. To release this mechanism, the finger is made to engage the projecting head 42, of the pin 42, when the said pin may be withdrawn out of locking engagementwith the piston rod, before mentioned, and a suitable spring, hereinafter mentioned, projects the piston rod forwardly so that its end is removed out of the range of action of the bolt operating lever when the gun is being used as a single firer or repeater. This forward movement of the spring-pressed piston is limited by the collar 43, coming against the end of the cylinder as in Fig. 26, the gas passages of the automatic attachment, hereinafter mentioned, being in this case normally in'regis- If the piston is in its normalposition when this uncoupling is eifected, the spring does not operate to further move the piston forward. The trigger-guard plate 144 is clearl shown in Fig. 2. It has its front end curved upwardly and forward with the forward extremity lying in a plane somewhat higher than that of the balance of the guard plate.
This forward extremity of the trigger guard plate pivots upon a drive pin 45 which extends transversely across the lower end of a vertical or down-turned end or arm of a yoke 46 the major portion of-which is horizontally disposed below the breech and forward end of the receiver B, and has its rear end forked to form an open bearing for the with a hollow stud or boss 49 which enters a socket in the stock, A, and abuts vertically against a stud 50 on the underside of the front end of the receiver, as shown in Fig. 3, a threaded bolt or'screw 51 being passed through the yoke and hollow stud .thereof from below and screwing into the -stud,on the receiver whereby the yoke serves to secure the front end of the trigger guard and front end of the magazine to the receiver.
The trigger guard plate carries the trigger guard 52 which latter is much like the trigger guard shown and described in my aforesaid prior application, Serial Number 348,057, in that it has fixed to its rear end a post 53 which 'iassesthrougha sleeve 54L adjustably fitted to the rear or tail end of the trigger guard plate. The sleeve has internal threads, and the base of the post 53 threaded to engage the" sleeve, said post having its upper portion flattened onf'two opposite sides, the remaining sides being threaded to screw into engagement with a suitable hole or socket 54 in the underside of a rearwardly and downwardly curved ex tension of the bottom wall of the rear end of the metal receiver, 1).
The trigger guard is provided at its front end with a stud 55 adapted to spring into locking engagement with a suitable recess or hole in the guard plate whereby when "it is desired to open or detach the guard plate and afford access to the parts which it carries the trigger guard is first pulled down to detach its stud from its hole after which the trigger guard turned to the right in its bearing in the sleeve 54. This action at the same time removes thethreaded upper portion of the post from its engagement with the threaded portion of the socket or recess in the tail end of the receiver and turns the flattened sides of the ost-.into parallelism with the long sides of the recess thereby enabling the post to be pulled out of the recess and the trigger guard plate with the attached trigger guard to be lowered about the pivotal connection at the front downturned end of the yoke 4:6. The reverse op-' sleeve in which the post is turnable is to enable the sleeve to be adjusted to cause it to shorten or lengthen the seat or bearlng for the post, and thereby compensate for shrinkage of the stock, as more fully explained in my aforesaid application 348,057.
The tri er uard )late. is made ll lCl with m r l a trigger holder 50 which comprises a forging forked to form two spaced vertically standing walls between which the trigger 57 is pivotally'mounted. The walls of the (rigger holder have horizontal slots 58 near their upper ends said slots opening rear 'ardly through the rearedges of said walls to admit the trunnion ends of a drive in 59 fixed transversely in the. upper end 0 the trigger as shown in Fig. 3 said trigger having its.
intermediate portion extending forwardly and downwardly from said pivot. In other enema? words the trigger is of more or less angular form with the two opposite portions extending rearwardly from the intermediate part in substantially divergent planes, said intermediate portion having av forwardly projecting spur 60 adapted to engage a squarefaeed notch 61 in the vertically disposed sear-post 2 said post having" in its rear side justloelow the horizontal or square face of said notch, a longitudinally extending groove or channel 03. In its normal position, the square face of the trigger spur 0 engages the square face of the notch in the v sear-post. Then the trigger is pulled rearward the spur 60 on its front face forces the spring pressed sear-post down until the spur rides out of contact with the square-faced notch 61 of the sear-post, thereby releasing the post. The post is instantly returned to its normal position with the collar G-l in contact with the underside of the tail of the receiver. When the finger is removed from the trigger, the trigger spring (35 which lies back of the trigger, and which was compressed when the trigger was pulled backward, forces the trigger forward thereby causing the spur or point 30 to fulcrum and ride upwardly on the sear post and gauising the upper-part of the trigger carrying the pivot pin 59 to be forced backward in its slots 58 until the spur on the front of the trigger body is lifted in register with the square-faced slot (31' in the sear-post ('32, when the whole upper pa rt of the trigger is forced fori'ard.- the spur resting in the slot in the spring-pressed sear-post. l
The trigger is acted on by the spring (35 which bears against its intermediate portion, the rear end of the spring seating in a recess in a. vertical wall of the trigger-guard plate at the base of the trigger holder.
The sear-post is springpressed it being en-.
to engage the lug 16 on the underside of the firing-bolt inthe usual well known manner.
The magazine may be of any usual type suitable for a gun of this character. The magazine shown for illustrative purposes is provided with a suitable form of hollow ribbed spring support 71 upon which sup port the cartridges are placed and by which the said cartridges are fed into the receiver to be subsequentlvpushed into the breech end of the barrel by the breech bolt, in the manner Well known in this art.
The magazine is supplied with the spring 72 and the bottom plate :73 which fits in a lot) a pair of spaced lugs 7 7 between which the lower notched end of the spring-plate 75 is received when the magazme 1s closed, as in Flg. 3. .For the sake of lightness and to allow dirt to sift out, the magazine may be supplied with numerous holes, as shown.
Turnably mounted between the spaced lugs 77 is a pin or shaft 78 which is fiattened or squared on one of its sides as at 7 9 said shaft or pin having a squareface or surface 80 arranged at right angles to the first-named surface. ()11 the outer end of the shaft or pin 78 is fixed a finger piece or lever 80 by means, of which the pin or shaft may be turned to lock and unlock the magazine as I will hereinafter explain. In connection with these features, I use a shifting lever 81 which is horizontally disposed and fits a bore in the bottom of the receiver, Fig. 4, the said lever having a thumb piece 82 on its rear end and having an eccentric pin or portion 83 on its front end adapted to turn in and out of a slot. or recess 84: in the upper left-hand corner of the rear wall of the magazine, as shown in Fig. 32 and as fully described in my former application, Serial Number 348,057. Vhen the shifting lever is turned so that its thumb piece stands upwardly, the eccentric pin or end thereof operates against the bottom wall of the slot Si and the'said magazine is slightly lowered to project its bottom plate sufficiently below the trigger guard plate to give ready access to the lever orthumb piece 80 of the turnable shaft or pin 7 8 which looks the bottom plate 73 to the magazine, and allows the finger or the butt of'a cartridge to be inserted under the free end of the lever 80 to rock .the shaft or pin 78 and turn its locking square-portion out of the square-faced notch-m the spring plate '75. Thispermits of the removal of the bottoluplate of the magazine and the tions, before mentioned, to insure the proper securing of the'parts.
Journaled in the breech bolt cap 17 is a locking lever 90 having an operating thumb piece 91 and an eccentric front end adapted to interlock with an appropriate notch 92 in the side of the rear end of the breech bolt 1 (Fig. 16) the rear wall of the cap piece having two notches 93, 93 into engagement with one of which a spring 92k fixed to the thumb piece of the lever is adapted to enter when the said piece is turned into either of its positions. The upper notch 93 in the rear of the cap piece has one side square so that the locking lever will not go past a vertical position but by pressing the locking 'the upper notch is square faced, preventing the removal of the shifting lever unless the spring is forced into its channel.
hen the thunib piece is turned in one position, the eccentric 95 at the front end of the boltextension of the said-piece is turned into locking engagement with the notch 92 in the breech bolt and the spring interlocks with the notch 93 in the end of the cap piece. This looks the entire gun action and prevents the actuation of the main lever, E,
and locks the firing bolt out of contact with the sear. \Vhen the finger piece 91 is turned in the opposite direction the eccentric or pin is turned out of the notch 92 in the breech bolt and the spring 94 is turned into engagement with the other notch 93 inthe end of the cap piece. The bolt is now unlocked from the cap-piece and can be turned in the usual manner by the main lever E. The locking lever is also formed with :1 lug or flange 95 on the underside of its rear end adapted to operate in a slot or recess 96 in the upper wall of the cap piece 17 said lug "'or flange,or the wall of the notch 97 in the firing bolt which it engages, being preferably cam-shaped toallow the turning of the lever to an upright position to lock the gun action, to also cam back the firing bolt enough to release the sear. One side of the lug or flange 95 is curved to conform to the curvature of the bore of the cap piece so that when the locking lever is turned down, this curved portion fills the slot or recess 96 and excludes sand or grit therefrom. The flange or lug 95 by entering the recess, also prevents the endwise removal of the lever, which movement can only be etfected'upon turning the lever from the vertical position to a horizontal position to the right thereof.'
The locking lever 81 for the magazine also has a flange 81 fitting a recess in the re-- matic clip dog 100 which is pivoted to the side of the rear end of the receiver and fits a channel 101 in said receiver ,(Fig. 6). This dog has a milled or roughened front end, and a downwardly projecting spur 102 which is designed to be forced into the range of action of the front end of the breech bolt when the said bolt is retracted. The dog 100 also has a spur 103 at its rear end adapted to engage with the top surface of the receiver to limit the upward movement of the free end of the dog. Inthe side of the dog 100 is made a notch 10% a corresponding notch being made in the receiver opposite to the notch, as shown in Fig. 33.
When it is desired to load the empty magazine, the breech bolt ispulled rearwardly until its front end passes the rear end of the upper plate or floor 71 of the magazine when the latter because of bein spring-pressed, projects in front of the front end of the breech bolt and forms a stop therefor to prevent the forward return of said bolt.
The usual and well known cartridge clip with its'ass'embled cartridges is now pushed into the usual opening in the receiver, the
usual lugs on the clip fitting the notches 104,
in the clip-dog 100 and receiver. The pack I of cartridges is now pushed down at the front end and this rocks the clip and causes the lower end of said clip to move backwardly in contact with the front end of the now retracted breech-boltand push this bolt farther rearwardly and out of engagement with the magazine, and until the front end of said bolt and the end of the extractor which the bolt carries is moved past the end of the spur 102 on the automatic clip dog 100 whensaid dog is pressed down to bring its spur 102 into the range of action of the breech bolt to thereby form a stop to prevent the return of the bolt. The spring plate 71 of the magazine feed being now unlocked from its former engagement with the retractedbrcech bolt, the pack of cartridges may be readily pushed into the magazine,
the spring plate constantly yielding for this purpose, and other cartridges may be likewise added until the magazine is full. llVhen the loading of the magazlne 19 completed,
in the receiver and acting upwardly under the free end of the dog, as ih Fig. 1, whereby as soon as the breech bolt is again pulled rearwardly, by the lever E, the spur 102 of the dog is released to allow the sprmgaxis.
near/e7 pressed pin 106 to act to lift said spur out of the range of action of the bolt; when the breech bolt is now shoved forward, by the lever E, the elevated clip is ejected thereby and falls out of the gun. The clip dog also permits the breech bolt to be retracted and instantly locked by the said spur 102, in a position rearward of the magazine at any time to refill a partially empty magazine.
The extractor 110 lies alongside of the breech bolt and its rear end is provided with an elongated slot 111; the cap-piece 17 of the breech bolt is also formed with a stud 112 having flattened sides. In assembling the extractor, the latter is turned crosswise of the breech bolt and cap-piece and until the elongated slot is in register with the stud when the latter enters the slot, after which the extractor is turned a quarter-turn and until it is parallel with the breech bolt, the front end of the extractor fitting over the front end of the bolt as in my former appli cation Serial Number 3%,057. J
The extractor has a longitudinal slot 112 in which is pivotally mounted a bar 113 backed by a spring 114: which is' fixed in the rear end of the extractor above the Plane of .the stud 112 and has its free end engaging thebar 113 back of its pivot. of thebar 11;) is designed to be held in a The frontend groove" or channel 115 in the side of the breech bolt to lock the extractor to the bolt, and to form a longitudinal guide which will prevent the breech bolt rocking about its The ejector inthe present case consists of a pin 116 slidably mounted in and parallel with the inturned front end of the extractor. By making this pin short or long the force with which the shellis ejected may be controlled owing to the projecting length of the inner. end of the pin.
Referring now to the automatic attachment of Figs. 26 to 30, inclusive, and Fig. 1, where the attachment is shown in its position on the sidev of the gun, it will be seen that the attachment is fitted to the gun barrel by means of a bracket or forging 120 which is bored to receive the cylinder 121 of said attachment. A hole 122 is made vertically through the forging in a plane at right angles to theaxis of the barrel and cylinder, said hole at one end intersecting the bore of the barrel through the gas 1ntake' 123 and at the other end connecting with whole 12st made transversely through the cylinder. i
The cylinder and forging are provided with abutting lugs or webs 125, 126, the meetingfaces of which are each provided with matching grooves which form the holes '12? for screws or bolts which by passing across the line of joint or division between the forging and cylinder, hold the cylinder truly in line with the barrel and prevent wardly to again automatically set the gun mechanism for the next operation of firing, as I will now explain. 7
The cylinder 121 is closed at its outer end, as the screw plug 128. Vithin the cylinder operates the long piston 130 having agas passage 131 made longitudinally through it from the front end to a point slightly back of the vertical plane of the gas passage leading from the barrel and forging, said longitudinal passage in the piston 'normally connecting with the gas passage formed in the barrel and forging by means of a right-angled passage 132. The piston may also be provided with a packing ring 133 near its front end which operates in conjunction with a shoulder 134 on the interior of the cylinder to scrape the inner wall of the cylinder of any foul deposits, and said cylinder may have annular grooves or channels 135 in itsinner surface into which deposits of foul material scraped off by the piston in its reciprocations may be deposited.
The cylinder is made rigid with a threaded nipple 136 which screws into the forging, asin Fig.28, this nipple containing a part of the aforesaid gas-passage and the upper end of the nipple being reduced and the adj acent. under side of the barrel being cut out "to form a square faced seatfor the end of the reduced top of thenipple. Within the nipple and forming a lining for the gas passage thereof is a nickel or other hard metal sleeve 137 the purpose of which is to protect the passage from the destructive effects of erosion or enlargement of the passage due to the gasand the pressure under which it is driven through the passage on its way to the cylinder.
The piston 130 may have annular grooves 138 the edges of which serve as scrapers for removing deposits on the inside of the cylinder, said piston having the piston. rod 34 which detaohably connects with the main operating lever E, of the gun, as before pointed out. A lubricator 140, is fixed to the cylinder and connects with. the interior of the cylinder to supply the piston with sufiicient lubricant tomake its operations easy. The
piston closely fits the cylinder and said cylinder extends sufficiently beyond the front end of the piston when the latter is in its normal position, to'form a chamber in which thegases of the exploded charge will be trapped I and allowed to expand, as I will hereinafter i explain.
As shown in Figs. 18 and 27, the rear end 5 of the cylinder is provided on its inside with l mutilated threads 141 and the corresponding end of a casing 1&2 in which the spring 143 is partially housed is provided with similar threads adapted to interlock with the threads of the cylinder to form a strong and quick-fitting fastening between the two parts. The front end of the spring casing also serves as a stop against which a hardened collar 144 on the piston rod strikes to limit the rearward movement of said piston. The spring casingleLQ also has fixed to its outer end a handle or piece 145 by which the casing may be turned to lock and unlock it and to allow it to be removed and stored.
The piston rod 34: extends through the closed end of the spring casing and its outer end is notched to engage the spring-pressed pin 42 in the knob'of the operating lever E, as before explained. Fixed to the outer end of the piston rod is a lever as by which when the connection of the automatic attachmentwit-h the lever E is broken, the piston may be turned axially to turn its gas passage laterally out of register with the gas passage in the barrel and forging. This lever carries lugs 43' which interlock with grooves in the socket end of the lever arm 32 to thereby hold the piston with its gas passage in proper register with the gas intake port of the barrel, when the parts are coupled.
In connection with these features I mention the fact that the cap-piece of the breech operating lever, E, is formed with a shoulder tact to prevent the lever being forced backwardly by the piston when the bolt has reached the end of its stroke.
Practical experiments with the gun have shown that the best results are only obtainable when observing a certain relation in the length and diameter of the piston, the length and diameter of the gas chamber of the cylinder, the diameter of the intake port, the length of the lever arm from the center of the hub to the center of the semispherical projections, and the length of thc lever arm ,from center of the hub to the center of the arcrface.
The dimensions which I prefer to use for the above parts is as follows: Interior of the ca'rtridge shell at the butt, 13/32 of an inch.
7 Diameter of piston 19/32 of an inch. Length of gas-chamber 13/8 inches. Diameter of gas-chamber 14/32 of an inch. Diameter of intake gas-port, .090 of an inch. Length of lever arm from center of hub to center of semispherical projections, 7/8 of an inch. Length of lever arm from center of hub to center of arc-face 11/8 inches, but this latv bolt is formed with a shoulder 1 16 and the r 147 these two shoulders being adapted to con-c ter length can be shortened to equal the length of the lever arm but cannot well be any longer than as stated above, namely, 1"}; inches, as if it be longer the breech bolt will beturned and unlocked before the bullet has left muzzle of the gun, and the breech bolt will receive the full breech pressure, and the salient feature of my gun will be lost as the gun would. in the -ase mentioned, become what is technically called a blow-out gun, which means a gun wherein the breech bolt is actuated by the gases of the breech, causing enormous breech pressm'e. In addition to the above stated action the piston would also receive the usual pressure which would also add force to the rearwardly forced bolt causing it to wreck the mechanism when it arrived at the: end of its. stroke. 1 have made the lever 1/4: of an inch longer than the arm so that the piston mechanism will not need an excessively strong spring to close and lock the action, but any additional length would alter the genefill action of the whole inven'- tion. unless the piston was made smaller in dian'ieter or the'gas chamber was made much larger, or the intake port made much smaller. The interior of cartridge shell at the base being 13/32 of an inch in diameter and the f piston'l/SQ of an inch smaller, 12/32, it may readily be seen that the pressure. exerted against the lugs of the breech bolt must at all times more than equal the piston pressure. This being the case, the lever and its arm should be nearly evenly balanced, the piston diameter should be slightly smaller than the interior. diameter of the shell at base, audthe gas chamber"should be of a given length and diameter in relation to the intakeport. When all bear a given relation as regards diameters and lengths (the length of lever and arm) the action will never be operated until the bullet has left the muzzle of the barrel and the breech pressure is released.
A main operating lever arm made of the above described diameters and lengths is very nicely balanced and sensitive yet will ren'iain locked until the breech pressure is removed by the bullet leaving the muzzle of the barrel. The length of the lever being slightly greater than its arm, as in my present invention, the gas chan'iberand intakeport' cannot vary but very slightly from the sizes given. For instance, if the gas chamber is shortened toauy ap ')reciable extent, the intakeport remaining constant, the pressure in the cylinder becomes so great that the )iston isforced backward causin h the bolt to be turned by the lever before the bullet has reached the muzzle of the barrel. The same will be the case if the intake port is'enlarged, the gas chamber remaining constant. ()n the other hand, if the chamber is enlarged, the lntake-port remaining constant, there Wlll not be enough pressure to operate the intchai'iism, and the hole in the piston will remain in registcr with the intake port allowing the gas to escape. The only case in which the gas chamber and intake port may vary is when the lever and arm are balanced, that is, are of equal length.
The piston could in no case have its diameter increased unless the length of the lever from its hub to arc-face were made shorter than the arm from center of hub to center of semi-spherical projections. The general rule is, that the diameter of the piston should at all times be of a dian'leter smaller than the interior diameter of the cartridge shell at the butt, 'or at its largest interior diameter; and that the gas-chamber and intake port should remain very closely the sizes stated, otherwise the lever must be shortened. thus necessitating a very strong return spring, which would be very inconvenient in opening the action by hand, and which would. when the piston and cylinder became foul from tiring, cause the piston to remain with its hole in register with the intake port and allow the gas to escape;
thisl have found by actual experiment to be the case. I have also discovered by experi ment that the initial movement of the lever in turnil'ig the bolt should be free in order to allow the piston to move backward with slight resistance so that its hole is brought out of register with the intake-ymrt instantaneously as the bullet leaves the muzzle of the barrel and the breech pressure is released, thus trapping the greater portion of the. gas in the cylinder. v
From a cursory reading of the above statenlent it would seem that I must be mistaken, as the statement appears, at first glance. to be in conflict with the previous statement in regard to the actuation of the n'iechanisl'n before the bullet has left the muzzle of the barrel when certain conditions and sizes, etc., are varied. The statements are, however, not in conflict as the conditions existing when the bullet in the barrel between the intakes port and muzzle are entirely ditlerent to those existing after it has clcaredthe muzzle. After the bullet has left the muzzle there is no interior pressure in the barrel, and if the initial movement is not free the confined gases in the gas cham ber rush out of the intake port into the barrel that being the line of least resistance,
and without moving the piston; WllBI82IS,"lf the initial movement is free the pressure of the gases instantaneously exerted move the piston and its contained hole backward, thus trapping the greater part, although a considerable portion of the gas does escape out the intake-port, still there remains enough to operate the piston backward to the end of its stroke, and still having plenty of reserve force left. In fact, whereas in my in vention the piston is forced backward five the bolt will be turned under pressure and unlocked when it will be blown backward by the gases from the breech.
The magazine being charged with loaded cartridges and one placed in the breech, the
general operation of my automatic gun is as follows: The trigger being pulled backward the firing pin shoots forward striking the primer and igniting the powder charge and starting'the bullet on its flight through the barrel. After the bullet has passed the intake-port leading from the bore ofthe barrel to the gas chamber at the forward end of, the cylinder, the gas begins passing through said port and continues to force its way in until the bullet has reached the muzzle of the barrel when the gas in the cham ber is approximately of the same pressure as is the gas in the barrel. The bullet then leaving the muzzle of the barrel all breech pressure is removed and thebolt is freely turnable on its axis. The gas in the'gas chamber at the head of the piston exerting its pressure instantaneously forces the pistonand its contained lateral hole or portbackward bringing this hole or port out of accompanying mec the trigger backward; When al cartridges have been fired from the ma aregister with the intakeeport leading from the bore of the barrel, and trapping the greater part of the compressed gas which was in the chamber when the bullet left the muzzle of the barrel. The gas now being trapped, the piston is pushed backward'and forces the bolt which has been already turned to an unlocked position by the initial movementof the piston, and bolt mechanism rearward until the hardened collar, 144, of the piston impacts against the end of the springcasing, 142, and the bolt lug. has at the saine instant come in contact with itsstop in the receiver. By this operation the piston-return spring has been compressed and the gas having escaped through the intake-port, the empty shell having been ejected and a loaded one forced up in frontof the head of the bolt by the ma azine spring, the piston spring forces the b0 t and and locking the action, seat-in the loaded shell, cocking the firing bolt, an leavin the piece again in condition for firing b pu ling of the zinethe rib, 71, of the magazine-floor ho ds anism forward closing" the bolt retracted until a clip of loaded cartridges is inserted through the top of the receiver, when the automatic clip-dog, 100, pivoted to the left side of the receiver,,is forced down by't-he clip, and the clip at the same time forcing back the bolt, the bolt is caught and heldv by the spur or projection, 102, of the clip-dog being forced into a small channel or cut in the head of the ex tractor. The loaded cartridges may now be pushed into the magazine by the thumb of the right hand If the clip contains only five cartridges, it is removed by the hand and another one inserted, the bolt now being held by the clip-dog. After pushing the cart-ridges out of the second clip into the magazine the clip isleft in position in the receiver. By taking hold of the bolt lever knob 33 and giving a slight pull backward the clip-dog releases the bolt and at the same time slightly raises the clip from its position in the receiver. Now by releasing the knob the bolt shoots forward, ejects the clip, forces a shell home in the breech, and
turns to its locked pwition, leaying the firing bolt retracted in firin positlon.
If atany time during theing of the gun it is necessary to stop the bolt in its retract-. ed position at the end ofits stroke, it may be accomplished by putting pressure on the top of the clip-dog so that'when the bolt reaches its most rearward position it will be caught and held by the spur of the dog, as when the bolt has passed under the clip-dog the pressure exerted will cause it to move downward thus intercepting the bolt as it starts to return, an important feature as the magazine may be filled when partially,
empty without having tospull a loaded shell from the breech.
Having thus described-my invention what I c aim as new and desire to secure by Let'- ters Patent is:--'
1. In an automatic gun, the barrel thcrof, a cylinder supported relative to the'barrel and normally in open connection with the bore thereof, said cylinder having a closed front endforming a ti ht gas-cha-m- I ber, in front of the piston, an a piston operable in the cylinder and normally establishing communication between the barrel and gas chamber and operable as an automatic cut-ofl' to trap the gases in the chamber whereby said gases operate expansively upon the piston to actuate the gun mechanism.
2. In an autoinatic gun, the barrel thereof;
a cylinderconnected thereto and in open .connection with the borethereof, and a pis ton operable in the cylinder having1 a longitudinal gas-passage one end of w ich connects directly with the portion of the cylinder in front of the piston and the other end is in normal r 'ster withthe 0 en connection between. t e barrel and. cy inder, .said
piston being operable the expansion of the gases in the cylinder to interrupt said connection asubstantially coordinately with the bullet leaving the muzzle of the. gun.
8. An automatic attachment for fire-arms, said attachment having a cylinder with a gas intake for receiving the gases of the exploded charge, and a piston having a longitudinally-extending gas-conducting passage the opposite ends of which are normally in open connection with said cylinder and the gas intake of the cylinder, said piston being operable by the gases conducted mally in register with the gas intake andgas chamber, said piston operable across the to thecylinder tocfirst cut-off the gas intake thereof and then trap the said gases and retard their expansive force until the projectile has substantially left the muzzle of the gun, when the gases are permitted to d-er having a longitudinally extending gas.
passage the opposite ends of which are norgas intake to cut ofl the same and trap the conducted gases in the gas chamber of the cylinder and to be actuated by the expansive energy of said trapped gases to in turn actuatethe firing mechanism of the gun.
5. An automaticattachment for fire-arms said attachment comprising a cylinder having a gas-intake, a piston operable in the cylinder and having a greater length than diameter said piston having an axial gaspassage with a lateralintake, and said cylinder extending forward of the front end of the piston in its normal position, to form a closed gas chamber into which one end of the gas passage of the piston directly leads, the lateral intake of the said gas passage being normally in register with the gas intake of the cylinder and being moved out of register with the gas intake of the cylinder to trap the gases in the gas chamber of said cylinder substantially coordinately with the flight of the projectile from the muzzle of the gun barrel.
6'. In an automatic gun, the combination with. the barrel thereof, having a gas-port,
of a cylinder having a gas-chamber normally in open connection with the bore of the barrel and receiving gases from the exploded charge, a piston controlling said port and having a longitudinal gas-conductlng passage with a lateral intake normally in register with said gas-port, and means connecting the piston with the gun action said piston trappingthe'gases in said chamber to allow l andthe them to act expansively upon the piston to automatically actuate the gun-action.
7. In an automatic gun, the combination of the barrel having agas-port, complementary cooking and firing mechanism, a cyliln der secured to the gun and having a gaschamber and a gas intake normally in open connection with the gas-port of the barrel, and a piston having a longitudinal gas-conducting passage with 'a ported-portion serving as an automatic cut-01f to trap the gases in the gas-chamber whereby they act expansively upon the piston to automatically actuate the firing-mechanism.
8. An automatic attachment for tire arms, said attachment having means including a cylinder and a piston with axial gas-pas sage and lateral gas-intake for receiving and trapping the gases of the exploded charge, and retarding the expansive action of said gases until the" projectile has substantially left the muzzle of the gun and then permitting the gases to act expansively upon the gun mechanism, said piston having portions extending fore-and-aft of the gas-intake.
9. The combination with a gun having a barrel and complementary firing mechanism. said barrel having a gas-port, of an automatic attachment for said gun, said attach ment having a cylinder with a gas-intake normally in open connection with the bore of the barrel, a piston having a gas-intake normally in register with the gas-port of the barrel and having portions extending fore-andaft of said gas-intake, said piston having a longitudinal passage connecting with the gasintake for receiving the gases of the exploded charge and conducting the same to said cylinder, said piston serving as a means for trapping the gases while under compression and then allowing the gases to act expansively upon the firing mechanism, and detachable means for rendering ,the automatic attachment inactive relative to the tiring mechanism without disturbing the latter.
10. The combination, with a gun having a barrel and complemetary firing mechanism, of an automatic attachment for said gun, said attachment comprising a cylinder having a gas-intake normally in open connect1on with the bore of the barrel and a guschamber receiving the gases of the exploded charge, means lncluding a piston extending means between the automatic attachment firing mechanism to render the aufore-and-aft of the gas intake and having a end with said gas chamber, and having a, lateral branch normally in reglster with the said gas intake, said piston extending foreand-aft of its gas-intake adapted to be moved to carry its lateral branch out of register with the gas-passage by the pressure of the gases in the gas chamber of the cylinder, and to trap the gases in said cylinder while still under compression, whereby said gases act expansively to operate the piston, and means connecting the piston with the firing mechanism whereby the lat-- ter is actuated automatically.
12. I11 an automatic gun, the combination with the barrel thereof, a cylinder fixed to said barrel, said cylinder and barrel hav-' protecting the same from the action of the ing a lateral passage forminga gas-intake, a non-erosive bushmg'm said passage and gases, a piston slidable in the cylinder and having a lateral port and a longitudinal passage connecting therewith and delivering the gases into the front end of the cylinder, said piston adapted to be moved by the gases tocarry its lateral. port out of register with the gasintake of the cylinder whereby the gases are trapped in said cylinder, and means connecting the piston with the gun-action.
13. In an automatic gun, the barrel thereof having a lateral gas-port a cylinder positioned parallel'with said barrel, a forging embracingthe barrel and having'a web portion abutting a corresponding portion of the cylinder, the meeting faces of said portions being correspondingly bored to receive a fastening, said forging having a threaded socket and said cyllnder having a threaded nipple to enter said socket and, said nipple having a sleeve or bushing of non-erosive material to protect the gas passage from the erosive effects of the gases of the exploded charge, an means connecting the piston with the gun-action.
14. In an automatic gun, the barrel, the
cylinder, and a piston, said cylinder having a gas-chamberand said piston having means for trapping the gases in said chamber, a
a piston rod connected with the piston, a
spring surrounding said rod, a sleeve or casing detachably fitted to the rear end of the cylinder and entermg said cylinder and receiving and housing the rear end of saidspring, a collar 011 the iston rod against which the opposite end 0 said spring seats, said collar adapted to contact with the inner end of said sleeve or casing when the piston is moved rearwardly by the expansive energy 'of the trapped gases, said sleeve and the rear end of the cylinder having interengaging' quick-threads adapted to lock the parts after they have been first fitted one within the other.
15. In an automatic gun, the combination with the barrel thereof, and a cylinder, said barrel and cylinder having a connecting gasintake, of a longitudinal slidable piston having a lateral gas-intake which leads into the cylinder, a rod connecting with the piston, and a lever on the outer end of said rod for turningthe piston axially to remove its gasport out of register with the gas-intake from the barrel.
16. In an automatic gun, the barrel thereof, the cylinder and the piston, said piston having a rearwardly extending rod, means connecting said rod with the gun-action said means comprising abreech-bolt, firing mechanism, a trigger-mechanism and a main operating lever having a knob or handle, a spring-actuated pin mounted in said handle,
the outer end of the piston rod having a notch with which said pin detachably engages whereby the piston rod may be connected and disconnected with the gun action.
17. In an automatic gun, thecombination with the barrel,the cylinder, the piston havin a rearwardly extending rod, the main b0 t-operating lever of the gun having a knob or handle with self-contained springpressed detent adapted to interlock with the outer end of said rod, and a lever fixed to v the rod and adapted to turn the same axially said lever and adjacent portion of the boltoperating lever having interengaging lugs and notches to preserve the alinement of the piston rod.
18. In a gun, the combination with the breech-bolt, the cap-piece fitted thereto and a bolt-operating lever, said lever being fulcrumed on the cap-piece and having means for turning the bolt about its axis, and being formed of jointed sections turnableone relative to the other to enable the sections to be arranged substantially in line or one substantially at right-angles to the other,
and means for locking the sections rigidly together when they are brought substantialy in line.
19. In a gun, the combination with the breech-bolt, the cap-piece fitted thereto and a bolt-operating lever, said lever being 'fulcrumed on the cap piece and having means for turning the bolt about its axis, andbemg formed of jointed sect-ions turnable one relative to the other'to enable the sections to be arranged substantially in line or one substantially at right-angles to the other, and
means for locking the sections rigidly together when they are brought substantially 1n line, said meanscomprisin'g a springpressed member mounted in one of the sections and adapted to engage a notch or recess in the other section. a Y
20. In a gun, the combination with the breech-bolt, the cap-piece fitted thereto and a bolt-operating lever, said lever being fulcrumed on the cap-piece and havlng means for turning the bolt about its axis, and being formed of jointed sections turnable one relative to the other to enable the sections to be arranged substantially in line or one substantially at right-angles to the other, and means for locking the sections rigidly together when they are brought substantially 1n line, said means comprising a springpressed pin mounted in one ofthe sections" and adapted to engage a notch or recess in the other section, the two sectionsv having coacting shoulders adapted to abut whenthe sections are brought substantially in line.
21. In a gun of the character described, the combination with the barrel, the cylinder, and the piston having a rearwarfdly extending rod, the breech-bolt, and compile mentary firing-mechanism, of the main dperating bolt-lever formed of two sections one jointed to the other, one of said sections having bolt-operating means and the other section having a socket to receive the rear end of the piston rod when said section is turned substantially at right angles to its companion section, detachable connection-between theouter section of the lever and the iston rod, a flange or shoulder on the inner ace of the outer section and an arc-face on the companion section against which said shoulder abuts substantially in linewith the piston rod, limitingstops between the two sections adapted to contact when the sections are brought substantially in line}, and the spring detent on one of the sectionsedapted to engage the other section to lock the sections in line. 1
22. In a gun, the combination with the breech-b-olt*the receiver, and the cap-piece fitted to the rear, end thereof, the rear end of' the bolt and the front end of the cap-piece having spirally-formed faces adapted to ride in contact and approach each other as the bolt is axially turned whereby a sand-proof jfoint is formed between the two, and means turning the bolt and reciprocating'the same in the receiver. I
. 23. In a gun the combination wlth the re ceiver, thebreech-bolt having a longitudinal groove or channel in its side, and a cap-piece tted to the rear end of the bolt, of an extractor detachably fixed to the cap-piece and having a longitudinally extending slot, and
'a spring-pressed bar pivotally mounted in said slot having a" forward end entering-the groove or channelin the breech-bolt.
24. In a gun, the receiver, the breech-bolt operable therein, and the extractor, said extractor having a slidably mounted ejector pin operable in its front end in aplane substantially transverse to the axis of the breechbolt.
25. In a gun, the combination of the receiver and the axially turnable breech-bolt- I operable therein and having locking lugs,
said receiver having a rear chamber provided with stops for the rearward and forward movements of the breech-bolt when removing the bolt from the receiver and inv ceiver, and the breech-bolt operable therein,
of a clip-dog pivotally mounted on the receiver and having a member to project into the range of action of the bolt and serve as a stop for the front end thereof when the bolt is retracted, sprin -pr essed member for mov ing the dog out of the range of action of the breech bolt and the front end thereof, coordinately with a rearward pull upon the retracted bolt.
"28. In a gun, the combination of the IEW ceiver, the breech-bolt operable therein, and the extractor, of a clip-dog pivoted on the receiver and having a part, to project into the range of action of the retracted bolt and to contact with the front end of the extractor, and means for automatically mov mg the said member out of the range of action of the breech-bolt to release the front end thereof, said dog having a groove or recess forming a seat for the cllp' of a cartridge-pack. a
29.- In a gun, the combination with the re ceiver, and a magazine having a channel or slot in the upper rear portion 'of a dog turnably mounted inthe receiver and having an eccentric end operable in said slot or channel to raise and lower the magazine, a removable bottom plate for the ma azine, a springplate having one end fixed and havinga notchedlower end, said magato the magazine zine having spaced lugs for the lower end of the spring-plate and a bolt or pin turnable in said lugs and having a flattened face or shoulder turnable into and out of the notch of the spring-plate to lock and unlock the -magazine to the removable bottom plate thereof, said bolt or pin having anactuating finger-piece.
3O. In a gun, the combination with the reneeen ends fitting and; turnahle in the slots of seiol yoke.
7 31. In a gun, the combination With the reeeiven-the hreech-hoitand the tiring holt of e, spring-pressed trigger, a, sear-post having e soar to engage the firing holt, said searpost having a square-faced notch in one siole and said trigger having 21. forwerdiy projeeting spur intermediate of its ends adapted to engage sei'ol notch seioi post having also, a out-away portion in its side below the notchagainst which portion the spur of the trigger rests after it iiisengeges the notch in the post.
32. In it gun the combination w th t e re- L Y f oeiver, the breech-bolt, the firing-bolt, and
the sear-post having a square-faced notch in its side, of a trigger holder having spaced wells with reerwardly opening slots e trigger having trunnions at its upper end fitting said slots, and hzivin e forwardly projeoting spur at its niicici e portion to ride into and out of the square-faced notch in the seer post, amt a spring in the trigger holder I acting against the trigger to press the spur .thereof in a forwardly anti upwardly direction to cause it to again enter the notch in the sear-post after the trigger has been pulled to reiease the post.
in testimony whereof I have hereunto set my hanci in presence of two subscribing Witnesses.
lVitnessee T Fem,