Historical Document · 1920
John D. Pedersen's firearm patent, filed 12 July 1917 and issued 12 October 1920, one of the four patents behind the Pedersen Device. Cited by the Pedersen Device dive.
J. D., PEDERSEN, FIREARM, APPLICATION FILED JULY 2, 197, 1355,420. Patented3 SHEES-SHEET 0ct, 12, 1920. 1. 1 /3 72 aS SS 2 NS N % A3 af fi r---- -> 2. 2 $2 7 isf23S3 S six) 3:YEA Azeezzar: e/2a2 A. Aeaea's 672 ay as ovey, 764-4. J. D. PEDERSEN, FREARM, 1,355,420. APPLICATION FLED JULY 12, 1917, Patented3 SHEETS-SHEET 0ct, 12, 1920, 2, 9 STATES PATENT JOHN D. PEDERSEN, OF JACKSON, WYOIVIIING. FIREARNI. Specification of Letters Patent, Patiented (Oct. Application filed July 12, 1917. Serial No. 180,054. To all thon it may concern; - 2, 1920. bers or devices which substantially corre Be it known that , JoHN D. PEDERSEN, Spond with those illustrated in my said a citizen of the United States, residing in prior application. It should be understood, Jackson, in the county of Lincoln and State however, that within the purview of my 60 of Wyoming, have invented certain new and present invention said framework of the useful improvements in Firearms, of which auxiliary arm may be constructed and in the following is a specification. teriorly arranged for similarly receiving This invention relates to that class of operable members and devices of different, breech-loading firearms which are primarily kinds, and Organized to operate in different 65 0. adapted for using a long-range ammunition, Ways than those which are herein specifi and are also adapted for the employment cally set forth by way of showing one, and therein of an auxiliary firearm mechanism a preferred, embodiment of and mode of having a framework or mechanism casing utilizing the present invention. that is removably fixable in the “receiver', While the cartridges for use in the aux 70 5 or frame, of the primary breech-loading iliary mechanism should in accordance with firearm. It will be remembered that among the best practice, be very much shorter than firearms of said class, the well-known the regular high-power cartridges for the “Springfield rifle', as made for the use primary arm-this being, usually and pref 75 of the United States Army, has been man erably, a shoulder arm, it will be conven 20 ufactured in very large numbers and with ient and desirable in many instances to have the parts thereof haying a high degree of the respective projectiles of about the same interchangeability. One of the principal ob diameter, so that the shorter ones Will Work jects, therefore, of my present invention is properly in the barrel of the shoulder arm. 80 to provide, for use in the “Springfield” his difference in the lengths of the respec 25 rifle-or for use in other arms having the tive kinds of cartridges favors the arrang frames thereof of an analogous construc ing of the proportions and details of the Secondary mechanism in such manner tion-an auxiliary firearm mechanism, hav: said as to require only a short reciprocation or ing a framework constructed, arranged ald stroke of the breech-boit member of this 85 furnished for being removably fixable in the frames of such primary sirms as afore mechanism, so that this entire mechanism said. including the framework thereof, may, in in a copending application, Serial No. practice, be so designed and constructed as 165,171, filed April 28, 1917, my present in to be for nearly the whole length thereof, 90 provements are partially illustrated and de contained within the space otherwise occu scribed in connection with a combined pri pied by the relatively long-stroke boit-mem mary and auxiliary arm in which the pri ber of the primary arm. . mary arm is adapted for using high power In addition to the foregoing, further ob and long range ammunition, and in which jects and advantages are pointed out and the auxiliary arm is adapted for firing with explained in the course of the following de 40 a relatively great rapidity, a short rallge tailed description of the preferred embodi ammunition, so that these arms may be used ment of my present improvements. separately or in a combined arrangement at In the accompanying drawings forming the election of the user. Taking such a fire a part of this specification, Figure 1 is a arm as the Springfield rifle for use as the plan view and Fig. 2 a side elevation of the .00 primary arm, and the usual breeching-men middle portion of a breech-loading shoulder of the well-known “Springfield’ type, ber, or “bolt” thereof being removed, the arm secondary or auxiliary firearm mechanism and having in place in the frame or “re may then be inserted and removably fixed in ceiver,” as C, the auxiliary or secondary working position, in place of the removed firearm mechanism, the framework or cas 50. breeching-member, and thus make the com ing, F, of which is inserted into the main bined or augmented firearm ready for use. frame or “receiver.” C, and thus for nearly For convenience of illustration, the the whole length thereof is contained within framework of the auxiliary arm is herein the breeching - member chamber or space shown as being interiorly constructed (i' al otherwise occupied by the usual breech-bolt O 55 ranged for receiving. Supporting and guid of the arm-not herein shown; in these ing a series or systems of cofiperating mem views, the operable mechanism within the 30 2 1,355,420 framework F is understood to be in firing or main frame C, having therein a breech position. In Figs. 1 and 2, the rear sight, ing member chamber; the barrel, B, remov T, is shown of a form and arrangement as ably fixed in the forward end of the re commonly employed on the “Springfield ceiver; a reciprocatable breech-bolt oper rifle, and hence it need not be described in able in said chamber (but not herein 70 detail; this sight is shown herein in the shown); the stock S, comprising the folded-down position thereon, and the usual usual foreand- stock and the shoulder por front sight is not shown. tions.-(not herein shown). The bar Fig. 3 is a plan view of the auxiliary rel B also carries thefully usual, or some suitable O arm; in this view the frame F is shown on sights, as the rear sight T and fore sight 75 the same scale and is shown in the same (not shown). The stock, framea and psition relative. . to. the line of sight, as in are held assembled by the customarybarrel re ig. 1. leasable fastenings-which do not require fig. 4 and 4 are similar sectional views particular description here-and an ordl 5 on line X of Fig. 2, for showing two posi nary magazine is indicated at M from which 80 tions, respectively, of the locking device, or to supply the regulation service cartridges “bolt-lock.” b° of the primary arm, whereby through the usual bottom opening of the this or an analogous device when in One po frame C to the required position forward of sition, Fig. 4", engages and thus holds in 20 place the frame, F. of the secondary mech the breech-bolt (when this is retracted), all in a well-known manner. Said maga anism, and when in another position, Fig. Zine M is partially shown in Fig. 2, but 4, releases said member F, and thus permits the spring follower usually arranged the secondary mechanism to be with therein are and here omitted, since those parts drawn-bodily and without disassembling are not only well-known, but when in place 25 of any parts thereof.--from the primary are not operable in connection with my 90 arm; these views, Figs. 4, 4', are drawn on present improvement. In this connection, an enlarged scale corresponding to Figs. it should be understood that the parts and 5 to 14, inclusive. illustrated in Figs. 5 to 9, and 11, Figs. 5 and 6 are, respectively, a plan features 12, being already well-known, need not be 30 view and side elevation of the receiver, or described herein, than is convenient 95 main frame. C, of the form of primary for the purpose further of explaining my present arm (this being a Springfield rifle) shown invention. in Figs. 1 and 2. Said primary-aim frame, C. is in the Fig. 7 is an end elevation of the receiver nature of a standard part or element, and 3 5 C, as seen from the left-hand in Fig. 6. it has a relatively complex structural forma 100 Figs. 8 and 9 are sectional views, taken tion which is well adapted without change on the lines X and X', respectively, of Fig. to the requirements of my present invention. 6; and, Fig. 10 is an end view similar to is clearly indicated in the aforesaid views Fig. 7, but showing some parts broken thereof, the member C is a frame having 40 away, as hereinafter more fully explained. centrally and longitudinally thelein an in 105 Fig. 11 is a horizontal longitudinal sec erior space-as 3. Figs. T. S.-into which tion, and Fig. 12, a vertical longitudinal the auxiliary frame F may be slid into section of the receiver, C; these views, simi place, as in Figs. 1 and 2. At the forward lar to Figs. 5 and 6, are drawn side by 45 side and in alinement, to facilitate compari end thereof, said member or frame, C, has a portion, as 3, (IFigs. 6, 12), which as seen 10 son of the details thereof. in section, is continuous, and which thus Fig. 13 is a vertical longitudinal section forms a rigid block to which the barrel B of the auxiliary arm, and is drawn on a is attached; but in some instances, if de Scale corresponding to Figs. 5 to 12, in sired, the barrel may be formed integral clusive. with the frame C, accordance with a 15 Fig. 14 is a side elevation of the frame former practice now ingenerally discarded. work, F, of the auxiliary arm; in this view Said forward block-end, 3, is connected by the frame F is seen in the same direction side-bars, 3, 3", with the rear block-end, as in Fig. 2, but is shown on the same scale 3”, which is also continuous circumferen 55 as in Fig. 13. tially of the bolt-chamber as seen in sec 20 Fig. 15 is a section in line X', Fig. 14: tion-see S. Rearwardly of said and, Fig. 16 is a fragmentary sectional view frame-blockFig. 3", the frame C is extended to similar to a portion of Fig. 13, but showing form a base portion, 3P, which is herein certain parts in a different position. shown provided with a threaded hole, 3, 60 Similar characters designate like parts in for the usual holding screw, (as 3, Fig. 2), 25 all the figures. whereby said extension 3P and the real Referring to the drawings, it will be re ward end of the usual guard-frame, as 3, membered that, as indicated in Figs. 1 and may be clamped onto the stock S in a well 2, the “Springfield’ rifle-which, of course, known manner. 65 is a military arm-comprises the “receiver' For the purposes of the said “Spring 30 - ". . . s l,855,420. being one of the leading purposes of field” rifle, the receivei or member C is pro theItinvention described and claimed in said vided with a number of surfaces, faces, chambers and channels, -and with other application Serial No. 165,171 to provide means and accessory features-of which for using the breech-loading shoulder arm 70 several are herein employed in connection with two kinds of ammunition and also to with parts or features of the frame F that enable the user to quickly change from are specially formed, positioned and ar either one to the other, as occasion may re ranged to be coöperative with such details quire, therefore, it is one of the purposes of the member C. On the left-hand side, of the present improvements to provide for 75 I () a guide channel, 3, extends from the usual the Secondary or “auxiliary’ mechanism, a bolt-lugs-Space 3. (Figs. 11, 12), along the framework, as F, having a construction adapting the same for use in com side-bar 3" and through the rear block-end especially with the said receiver C as a 3", as illustrated in Figs. 5 to 12. The Well bination known form of “Springfield ejector, as b, primary-arm-frame, and to coöperate with J.5 is shown located for the point b thereof details or features thereof which in the 80 to project into said channel 3', (Figs. 8, 11, primary arm have, respectively, different 12); while this device, b, is not directly purposes or functions. Accordingly said utilized or employed in my present improve framework, F, is herein shown with the for ments, the frame F has means whereby the Ward portion thereof made of a tubular 20 removal of said ejector b is rendered un and bolt-form construction (Figs. 3, 13, 14) 85 necessary, so that this frame may be slid whereby it may be slid forwardly into the into place without interference from that receiver or main frame C, and into a Work ejector. This important result is herein ac ing position relative to the barrel, B, and complished by making a channel, 6", (Figs. to other parts of the primary arm. When 3, 15), in the rib 6" for receiving said point thus inserted and locked in place, said 90 b' when the frame F is slid into its work secondary frame constitutes a retractable ing position, Fig. 1, without dismounting breeching-member for the barrel B. the ejector. Said ejector is usually and The tubular forward end of the frame F referably supported in a pivotal manner is shown provided with a forward extension, 30 as shown, So that it may swing to and from 6, which constitutes a barrel for the 95. firearm mechanism, and which for a position in which the ejector point extends secondary a portion of its length-as 6*, Fig. 3-is into said channel 6 when the frame F is in shown of a size and shape to fit closely with Working position. in the usual cartridge chamber of the main 1.00 in said block-end portion 3 of the main 35 frame, this member is shown provided with barrel B. When thus made, the short bar the well-known form, b, of pivotally sup rel 6° not only forms, when in place -a. rearward extension of the main barrel, but ported bolt-stroke-limiting device winich I also the main barrel so incloses said short herein employ as a means for releasably barrel as to serve as a container and 'ein locking the frame F in working position; it 1.05 40 should be understood, however, that in some forcement, therefor. instances, if desired, other suitable and Thus it may be said that a forward part well-known releasable holding devices may or extension of the frame F of the secondary arm, forms, also-or has therein-a rear be substituted, within the purview of my ward extension of the bore of the main bar present invention, for said device b°. Said O 45 block-end 3" also has in the upper portion rel B; also, that the short bore 6° connects thereof, the passage-way channel 3' which and is in alinement with, the bore of the employ for the passage of the magazine main barrel B, and with the cartridge chain 6, (see Figs. 13, 15, 16), of the secondary guides, as 6', 6, of the frame F. In the ber standard form of the main frame C, the firearm mechanism. Said forward exten 15 50 frame-extension 3P has therein a groove or sion, 6, therefore, in one sense, constitutes channel 3, and this channel I employ as an “adapter,” while it also constitutes the short barrel for the Secondary arm, so that the receiver-space, or 'ecess, for the de said extension 6 serves as a combined pending and rib-like lower portion 6 of the and barrel-extension for the pri frame F. Said portion 6 has therein a adapter 55 mortise, 6", which constitutes a chamber mary arm while serving as the barrel of the 20 arm. In practice, said secondary space for receiving a sear or other fire-con secondary to device. For convenience of illustration, barrel 6 may be made as a separate piece I have shown herein for said purpose the and removably-fixed in the forward end of same Sear-and-lock device which is described the secondary frame F, or, in some instances, preferred, said short barrel may be made 125 in my aforesaid application Serial No. ifintegral with said frame. However, the 165.17 E.; this device, however, constitutes in said separate construction, arranged is, part a mechanical movement which is de as herein illustrated, is believed to be scribed and claimed in my Copending ap ally preferable, and accordingly said barrel plication Serial No. 171,663, filed May 29, 6 is shown provided with a threaded end 30 65 197. se i,355,420 6° screwed into the frame F similarly as the traction of the firing pin in the bolt is main barrel B is fixed to the receiver C. stopped by the end, 85, of the tube 8 before The frame F may have -as herein shown the bolt G has been fully retracted. Said in Fig. 13-a tubular construction from the ap H is shown screwed onto the threaded chamber 6 to the rearward end thereof, and 'ear-end portion 6 of the frame F; the cap 70 the interior space which thus constitutes the may be locked in place by a spring-actuated mechanism chamber of the auxiliary arm, retractable pin or detent, 8, engaging in may be provided with a cartridge-operating notches, as 8, formed in the periphery of and firing mechanism. For this mechanism, the cap. By this means, said cap may be 10 I prefer to use an auto-loading mechanism Screwed onto the frame a greater or lesser 75 having a construction and arrangement distance, and so be locked in a selected posi which may be briefly described as follows: tion, as may be required for effecting a The cartridge-chamber 6 is extended rear slight adjustment of the precise workingpo Wardly and enlarged to form a loading and sition of the breech-bolt G and firing pin f. 5 breech-bolt chamber, 6', in which the bolt The detent pin 8 may be actuated by a 80 G is reciprocatable, forwardly by the power spring, 8", located in a bore, as 89, formed spring 7, (to the closed position in Fig. 16) in thetherearward part of the depending rib and rearwardly-when a cartridge is 6 of frame F. filed, - by cartridge actuation to the re in the particular sear-trigger apparatus 20 tracted or loading position, as in Fig. 13. of the auxiliary mechanism selected for illus 85 The bolt G is shown provided with an arm tration herein, the fire-control device or or projection, 7, which extends through the means consists of a sear-and-lock device com frame-slot 65 and there carries a weight 7 prising the two coacting members, the sear which also serves as a handle whereby the d and the lock e, these are or may be con 25 bolt may be retracted by hand for engaging tained within the aforesaid mortise-space 90 the retaining face 7 (Fig. 13) rearwardly of 6" of the said depending part 6, and these a sear-face, as d’, formed on some suitable members should each be spring-actuated in sear-device. Thus the arm 7 is a means for one direction, or to the locking position preventing the bolt G from turning (par thereof. Thus said depending portion 6* 30 tially rotating) within the frame F. of the frame F, is provided or adapted for 95 When the bolt G is retracted to the load carrying the fire-control device in a posi ing position, (Fig. 13), the forward end, 7. tion for coöperating with a trigger device thereof comes real wardly of the opening 6 (of the primary-arm frame) that is shiftable in the frame, F. (Figs. 1, 2, 3, 13), so that to and from a position in which this device 35 a cartridge will be lowered or drop down projects into the recess 3; this recess, it 100 in the magazine N and stand partially for will be noted, is shown located in the frame ward of the bolt G, and thus on the release C, and at the rearward end and lower side of the bolt, will be pushed forward-ol' of the bolt-chamber thereof. “placed,’ into firing position as shown in In the present instance, the Sear, d, is 40 Fig. 16. During the forward movement actuated on its pivot 6" by the sear-lock 105 which in practice will be rapidly conileted actuating spring eacting through the sear by said spring T-the relatively heavy fir member, e, which is also appurtenant ing-pin flies loosely in a fully-retracted po lock to the breech-loading auxiliary arm. The sition in the bore 7 of the bolt G, and will Spring 6 is or may be carried on a guide 45 at first be held back by its own inertia and rod, e, slidably mounted in the lock mem O the light spring 7, with the collar f' of said ber e, and bearing against the frame face pin resting against the shoulder at 75 in the 6, which thus serves as an abutment. The breech-bolt. On the bolt G stopping Sud sear-lock e being pivoted on the pin 6P, denly at the end of the forward stroke, the 50 momentum of the firing pin f compresses the Spring eitherefore tends to continuously 15 down the sear-engaging ende', which said pin-retracting spring and thus the force thus bears on the faced of the retracted point f8 of the pin is driven against the Sear for thereby turning the sear to the po primer and fires the cartridge in a mannel' sition thereof in Fig. 13; this stroke of sear already well-known in the art. d is limited by a stop, as 6". When this 55 The chamber 6 is shown extended to the operation takes place, the lock-end e' comes 20 rear end of the frame F, so that the opera forward of the face d of the seard, there tive members may be readily assembled by blocking (or “locking') the Sear in the therein and renoved therefrom. A suitable slide-engaging position thereof until the cap, as H, may be removably fixed on the locke shall be raised to a position, for un 60 frame F, in any convenient manner, for locking the Sear d, when thus released, 25 closing the rearward end of said chamber however, the lock e (unless otherwise con 6, and also to furnish a support for the trolled) will be quickly raised by a rota abutment tube 8, and also an abutment face tion of Sear d, since the faces 7 and d2 at S. (Fig. 13), for stopping the rearward are-in the preferable form herein shown 65 movement of the bolt G. Similarly the re So inclined or shaped as to operate as a sear 30 1,355,420 5 retracting means, whereby the seard will with and into a position for coacting with be actuated toward its bolt-releasing posi the sear-device of the secondary arm, there tion by the forwardly-acting pressure of by producing for use in the combined arms bolt or slide G. For limiting the downward a compound trigger-sear mechanism which 5 movement of the lock e, this may be pro comprises two sear-devices, of which one is 70 vided with any suitable stopping means, appurtenant to the primary, and the other to secondary, arm. Such, for instance, as the stop-face e' which theFor supplying the cartridges to the strikes the faced when the parts are in the chamber 6', any suitable and well-known 75 positions shown in Fig. 13. It will be remembered that the main magazine may be employed, but I prefer O trigger, 4, of the primary arm is pivoted to use fol' such purpose an ordinary at 4 (see Fig. 6) for operating in a well straight-tube cartridge-holder, as N. This known manner the main sear-lever 3, which form of magazine as herein shown may be is shown pivoted at 3 to the receiver or provided with the wings, or ribs, 14, 14, 80 15 frame C, and is strongly actuated by a which enter grooves 15, 15, formed in the spring usually arranged as shown at 3. projecting magazine-guides, 6", 6", respec The point 3° is thus normally kept raised tively, of the frame F. Said projections are up to its position in Fig. 2, and is thus in shown of a size and form which permits position when the ordinary breech-bolt them to pass through the usual space 3 of 85 28 (not herein shown) is in use, to catch and the frame C of the “Springfield’ bolt-gun, hold retracted the usual firing pin thereof, when the frame F is being withdrawn from all in a well-known manner. In order to or.inserted into said frame C. secure certain advantages by the employ Since the forward part of frame F is nec ment of said lever 3 in connection with the essarily limited in size by the dimension 90 25 secondary firearm mechanism, the Sear, d. of the bolt-chamber of the main-frame C, and sear-lock e are shown so located, ar and since it is also desirable to make the ranged and connected in or appurtenant to bolt G as large as practicable, therefore the or tube, of the frame F is made thin, the frame F as to bring each of said mem wall, bers d and e into a direct coaction with said and then as a means for reinforcing that 95 30 lever point 39; by this means, I secure a tube, the frame F is provided with the in guide-rib 6' which slides into said peculiar, and in some respects a relatively tegral channel 3. Said rib 6 is shown automatic mode of operation of the com main-frame bined firearm, as more fully explained in (Fig. 3) extending to the auxiliary barrel 6, and thus extends forwardly of the car 00 my said prior application Serial No. 165,171. tridge-receiving opening 6, for strengthen On the firing of a cartridge, the bolt C, 35 by reason of its weight and consequent mo ing the frame F at that place. The guide mentum, compresses the power spring 7, rib 6 also has a notch therein, with the and the mechanism is thus made ready for forward face thereof, 6, in position for co again driving forward the bolt when the acting with, and engaging forward of l05 the bolt-lock b° of the frame C, for thereby sear, d. shall be again retracted to the point releasably holding the auxiliary frame into of disengagement. In such operation, how eyer, the firing-pin point f, serves as an the main frame, the locking position of the ejector, in coöperation with any ordinary device b? is shown in Figs. 4 and 10 and extractor hook (not shown) with which the the frame-releasing position thereof is O 45 breech-bolt G should be provided in some shown in Figs. 4, 7 and 8. Thus the auxiliary firearm framework is suitable or well-known manner. Since the aforesaid primary arm is organ slidable into said bolt-chamber and has a ized for using relatively long cartridges, combined guide and reinforcing rib which is and the secondary arm is organized for in a position thereon for resting in Said 15 50 using short cartridges, therefore in combin channel, and is provided with a lock-engag ing face in position for coacting with said ing the two arms, (Figs. 1, 2), a short-stroke bolt-lock of the primary arm. Also, it may breechaction is substituted for the original seen that the frame C is centrally pro long-stroke breechaction, with the result of be bringing the sear-device of the secondary vided with a longitudinal bolt-chamber hav 55 mechanism in proper position for direct co ing on one side thereof a longitudinal chan 20 with a bolt-lock that action with the trigger-sear device of the nel which istoprovided and from a position in which primary firearm, so that while the trigger isthisshiftable extends into said channel. The sear device is in position for coacting in the framelockF on being thus unlocked, may be 25 usual direct manner with the firing-pin (not withdrawn rearwardly by a sliding move 60 herein shown) of the primary arm, and it and this operation may be accom is also in proper position for coacting in ment, plished with extreme celerity; prior to re the different manner herein illustrated, with leasing the stop or lock b°, of course the the entire breechaction of the secondary magazine N, if then in place, should be re 30 arm. Thus the trigger-sear device of the moved. Thus the same lock, or stop, as 5*, 55 primary arm is brought into a combination 40 Gas 1,355,420 which is used in the primary arm to limit vided for carrying a fire-control device in a the rearward stroke of a bolt-mechanism, is position for coöperating with said trigger also employed in the combined arm for the device of the primary-arm frame, guiding different purpose of holding the frame F of means arranged for preventing the rotation the auxiliary arm from having while in use of the auxiliary frame during the sliding 70 any rearward movement. thereof into the bolt-chamber, and means for Having thus described my invention, I releasably locking the auxiliary frame in claim :said bolt-chamber. 1. In a framework for combinable pri 5. In a framework for combinable pri 0. mary and secondary firearms, the combina mary and Secondary firearms, the combina 75 tion with a primary-arm frame which is pro tion with a primary frame which is pro vided with a longitudinai bolt-chamber hav vided with a longitudinal bolt-chamber hav ing on one side thereof a longitudinal chan ing on one side thereof a longitudinal guide nel, and also provided with a bolt-lock shift channel, and also having on the upper side 15 able to and from a position in which this thereof a passage-way channel, of an auxil 80 lock extends into said channel, of an auxil iary framework slidable into said bolt-cham iary firearm framework slidable into said be and having a projecting guide in a po bolt-chamber and having a combined guide sition thereon for resting within said guide and reinforcing rib slidable in said channel, channel and provided on the upper side and 20 and having a lock-engaging face in position near the forward end thereof with magazine 85 for coacting with said bolt-lock of the pri guides in a position thereon for passing mary-arm frame. through said passage-way channel during 2. In a framework for combinable pri the withdrawal of the auxiliary frame and mary and secondary firearms, the combina while this frame is guided by said guide and 25 tion with a primary-arm frame which is guide-channel. provided with a longitudinal bolt-chamber 6. In a framework for combinable pri 90 having on one side thereof a longitudinal mary and secondary firearms, the combina channel, and also provided with a bolt-lock tion with a primary frame which is pro shiftable to and from locking position, of vided with a longitudinal bolt-chamber hav 30 an auxiliary firearm framework slidable into ing on one side thereof a longitudinal guide 95. said bolt-chamber and having a combined channel, and also having on the upper side guide and reinforcing rib slidable in said thereof a passage-way channel, of an auxili channel, and also having a lock-engaging ary framework slidable into said bolt-cham face in position for coacting with said bolt ber and constituting when in forward posi 35 lock of the primary-arm frame when said tion a breeching-member for the primary 100 bolt-lock is in locking position. arm and having a projecting guide in a posi 3. In a compound framework for com tion thereon for resting within said guide binable primary and secondary firearms, the channel and provided on the upper side and combination with a primary-arm frame near the forward end thereof with maga 40 which is provided with a longitudinal bolt Zine-guides in a position thereon for passing chamber having at the rearward end and through said passage-way channel during 105 lower side thereof a recess and also provided the withdrawal of the auxiliary frame and with a trigger device shiftable to and from while this frame is guided by said project a position in which this device projects into ing guide engaging within said guide-chan said recess, of an auxiliary framework slid nel, and means for releasably holding said O able into said bolt-chamber and having a de auxiliary frame in said forward position pending portion which is in a position there thereof. on for resting within said recess and is pro 7. In a compound framework for com vided for carrying a fire-control device in a binable primary and secondary firearms, the position for cooperating with said trigger combination with a primary-arm frame 5 device of the primary-arm frame, and means which is provided with a longitudinal bolt for releasably locking the auxiliary frame in chamber having on one side thereof a rib said bolt-chamber. receiving channel, and also having at the 4. In a compound framework for com rearward end and lower side thereof a re 55 binable primary and secondary firearms, the cess, said frame being provided with a bolt 20 combination with a primary-arm frame lock shiftable to and from a position in which is provided with a longitudinal bolt which this lock extends into said channel chamber having at the rearward end and and also provided with a trigger device lower side thereof a recess and also provided 60 with a trigger device shiftable to and from shiftable to and from a position in which device projects into said recess, of an 125 a position in which this device projects into this auxiliary framework slidable into said bolt said recess, of an auxiliary framework slid chamber and having a rib in a position able into said bolt-chamber and having a de for resting within said rib-receiv pending portion which is in a position there thereon ing channel, and said rib being provided 65 on for resting within said recess and is pro With a lock-engaging face in position for 130 SO 1855,420 7 coacting with said bolt-lock of the primary receiving channel for receiving the ejector 50 point when the auxiliary framework is slid arm frame, said auxiliary framework also into a working position in the primary-arm having a depending portion which is in a frame without dismounting the ejector. position thereon for resting within said re 10. In a framework for combinable pri 5 cess and is provided for carrying a fire control device in a position for coãperating mary and secondary firearms, the combina 55 with a primary-arm frame which is with said trigger device of the primary tion provided with a longitudinal bolt-chamber arm frame. 8. In a compound framework for com having on one side thereof a longitudinal O binable primary and secondary firearms, the rib-receiving channel, said frame being pro combination with a primary-arm frame vided with an ejector having an ejector which is provided with a longitudinal bolt point and operable to and from a position in 60 the ejector point extends into said chamber having on one side thereof a rib which channel, of an auxiliary framework slid receiving channel, and also having at the 15 rearward end and lower side thereof a re able into said bolt-chamber and having an cess, said frame being provided with a bolt Outwardly extending integral rib in a po 65 thereon for resting within said rib lock shiftable to and from a position in sition which this lock extends into said channel receiving channel, said rib having therein a and also provided with a trigger device point-receiving channel for receiving the . 20 shiftable to and from a position in which ejector point when the auxiliary framework slid into a working position in the pri this device projects into said recess, of a ismary-arm without dismounting the 70 tubular auxiliary framework slidable into ejector, andframe means for releasably locking said bolt-chamber and having a combined the auxiliary framework in said working guide and reinforcing rib in a position position. 2 5 thereon for resting within said rib-receiving channel, and also having a lock-engaging 11. In a framework for combinable pri 75 and secondary firearms, the combina face in position for coacting with said bolt mary with a primary-arm frame which is lock of the primary-arm frame, said tubular tion provided with a longitudinal bolt-chamber framework also having a depending por having on one side thereof a longitudinal 30 tion which is in a position thereon for rest channel, said frame being provided with a ing within said recess and is provided for pivotally-supported ejector having an 80 carrying a fire-control sear-device in a po ejector point and arranged to swing to and sition for cofperating with said trigger de from a position in which the ejector point vice of the primary-arm frame. xtends into said channel, of an auxiliary 9. In a framework for combinable primary framework slidable into said bolt-chamber and secondary firearms, the combination and having an outwardly extending integral 85 with a primary-arm frame which is pro vided with a longitudinal bolt-chamber hav rib in a position thereon for resting within ing on one side thereof a longitudinal rib said channel, said rib having therein a chan 40 receiving channel, said frame being pro nel for receiving the ejector point when the vided with an ejector having an ejector auxiliary framework is slid into a Working 90 point and operable to and from a position position in the primary-arm frame without in which the ejector point extends into said dismounting the ejector. channel, of an auxiliary framework slidable JOHN D. PEDERSEN. 45 into said bolt-chamber and having an out wardly extending integral rib in a position Witnesses: L. E. WETMORE, thereon for resting within said rib-receiving E. C. GILBERT. channel, said rib having thereon a point