Historical Document · 1902
Theodor Bergmann's firearm patent, filed 15 October 1901 and issued 7 October 1902, covering his locked-breech pistol design. The Bergmann 1896/1897 dive cites it for the No. 5 / 1897 locking system.
i No. 7|o,4||.~ ' Patented on. 7, |902. T. BERGMANN. FIBEARM. (Applicazicn med oct. 15. 1901*.) (No Model.) v FWZ. I Y 3_Shee1s-Slf'eet I. Hyja _Bm/ET" qu à , No. 7|o,4||. . ‘ ~ Patented out. 7, |902. T. BERGMANN. FIBEÀRII._ applicativa med ont. 15, 1901,) (No Model.) /./ . \ \\ _m__ LTV-ZES 5 E5 / UNrTnD STATES PATENT OFFICE. THEODOR BERGMANN, OF GAGGENAU, GERMANY. FIREARM. SPECIFICATION forming part of Letters Patent No. 710,41 1, dated October ’7; 1902. Application filed October 15„1901. Serial No. 78,677. (No model() To ¿LZZ whom, ¿t may concern/.- v - l Be it known that I, THEODOR BERGMANN, a placed'the brake-wedgerC', 1, ‘the rear end of which is of vwedge shape, its front face ~ ‘ subject of the German Emperor,.residing at projecting slightly beyond the bottom of the 55 Gaggenau, Baden, in the Empire of Germany, recess made in the head of the cylinder to re have invented certain new and useful lm provements in Brakes for Firearms, of which the following is a specification. It is well known that in automatic firearms without stiff bolts the breech-bolt or cylinder lO ceive the end of the cartridge, Figs. 5 and 6.` The-brake-“wedge is held in the cylinder by `the foot e of the extractor D engaging in the groove c' of the brake-wedge C, Figs. 4, 7, and 9, and also by the firing-pin F, the point of is pushed back in the event of a heavy charge which passes through the front wall ofthe with a force that has a very deteriorating ef cylinder,vas well as by a spring G, the rear end of which is placed in the hollow of the fect on the weapon. . The improvement which is the object of cylinder. Owing to the first-named method 65 this invention allows a heavy charge’to be Aof fastening this` wedge will still beheld in the used in light weapons without affecting the cylindereven if _the springand firing-pin were strength or injuring the operating parts. taken off. In order to limit the recoil of the 'l‘his result is obtained by a breech-bolt or cylinder, it is necessary to use Vthe stop-plate cylinder which is enlarged during the ^ dis D', Figs. l0, 6, 5, and 8, which still guides the charge of the weapon by means of suitable de vices. This enlargement by exercising fric cylinder and may be made in the shape yof a sight. an under side view of the breech-bolt or cyl The accompanyingdrawings show the man ner in which the stop-plate is placed in the casing' A and the manner in which its lateral 75 feet d d are passed over the cylinder, as well inder, the brake-Wedge being drawn back. as the manner in which the shoulders b l) of _ tion on the sides of the casing arrests the re coil. In the accompanying drawings, Figure l is Fig. 2 is a plan view of the same without the the said cylinder limit the recoil of the ,cyl side of the same part.A Fig. 4 is a front view of the breech-bolt or cylinder with the brake plate D’. 'The central foot d' of the recoil plate D’ engages in the hollow of the cut-off 50 wedge. Fig. 5 is a horizontal section through the breech-bolt or cyiinder and its parts as well as the stop-plate. Fig. 6 is a vertical section of the same parts. Fig. 7 is a hori cylinder and serves as a rear bearing to the brake-Wedge. Fig. 3 shows the right-hand inder by bearing against the feet d d of the spring G. The foot d/ is held in this position because the firing-pin F passes through the perforated end of thesaid foot of the plate D. 85 zontal section through the case and the cyl The groove' b', Fig. 2, of the cylinder B is widened at b", so that the strengthened end 35 inder, as well as the parts of the latter, pushed of the _foot d’ can enter and leave the cylinder. back. Fig. 8 is a cross-section on the line A B, The brake works in the following manner: Fig. 7. Fig. 9 shows the brake - wedge as As soon as the base or flanged part of the car 90 seen from the back, front,’and side thereof. Fig. l0 is a back View of the stop-plate. Fig. tridge the bottom of which rests onv the outer 1l is a horizontal section through the middle face of the brake-block C is moved back after part of a double firearm with double brake. the discharge of the weapon the wedge,which Fig. l2 is a cross-section on the line A' B’, projects beyond the recess of the cylinder Fig. 1l. Fig. 13 is a similar section on the head, will recoil therewith, while the cylinder (owing to its inertia and the power of the ~ spring G acting thereon) offers such a resist The breech-bolt or cylinder B, arranged in 45 the casingAof a firearm reloading by means ancethat the brake-wedge opens the divided of the recoil, Figs. l and 2, is divided for a cylinder, and the two halves of the latter bear portion of its length, so that the two halves against the sides of the casing' A, producing IOC may be forced apart and then return to their friction the action of which is> proportionate to the energy produced by the base of the car 50 initial position as soon as the pressure ceases. tridge, `which after being fired leaves the bar In the division or opening, which is wider at ' the front than at the back of the cylinder, is rel toward the rear. line C D, Fig. ll. 2 710,411 The above-described brake can be arranged wedge, and a stop-plate Ysecured in said cas in such a manner that the bottom of the car ing and engaging said spring, substantially tridge will not act directly upon the front of the wedge C; but the breech-bolt or cylinder Will be connected to a brake-Wedge Which acts upon the split piston, as shown in Figs. 1l and 13. In this construction the brake-wedge 2 instead of being ñattened is formed as a as described. \ 3. In an automatic firearm, the combina tion, with the firing-pin and with the breech bolt, the latter having a longitudinal slit, of a Wedge engaging the Walls of the slit of said breech-bolt, and surfaces in said íirearm adapted to be engaged by said breech-bolt pin having a circular section. Figs. l1 and IO 13 show how during the recoil of the barrel 1 when expanded by the Wedge, said firing-pin 45 the projections l‘L act upon the brake-Wedge penetrating the wedge, substantially as de 2 in order to open the split pistons 3, pro scribed. ducing on the sides or Walls 4 the friction 4. The combination, in au automatic iire necessary to deaden the recoil. The springs 5 arm, of a casing, a breech-bolt in said casing, offer the resistance necessary for the action of an internal chamber in said breech-bolt,alon- SO the brake-wedge, the said springs causing the gitudinal slit in said breech-bolt, a Wedge in barrel to return to its initial position. This said slit, a stop-plate in said casing, a projec brake for firearms is shown double in Figs. tion formed on said stop-plate and extend 1l and 13. HOWever,_ one or more brake ing into the chamber in said breech-bolt, and .Wedges will be eüective on simple levers by a spring between said projection and said 55 pressing the latter against the solid sides, so wedge, substantially as described. , as to produce the necessary friction. 5. In a firearm, the combination of a split part,relatively fixed parts between which said l. The combination, in an automatic fire 25 arm, of a breech-bolt having a slit extend ing along part of its length and a recess at one split part is disposed, a wedge-shaped recoil receiving part engaging said first-named part in the split portion thereof, and a spring nor end of said slit having inclined surfaces, and mally pressing said recoil-receiving part out a wedge arranged in said recess and adapted of the other part, substantially as described. to be engaged by a recoiling part in the tire In testimony whereof I have hereunto set 30 arm to expand the breech-bolt, substantially my hand in presence of two subscribing Wit 65 as described. 2. The combination, in an automatic ñre arm, of a casing, a breech-bolt in said casing having Aa slit, a Wedge in said slit, a spring 35 arranged in said breech-bolt and engaging the nesses. TI-IEODOR BERGMANN. Witnesses: RUDOLF SUTOR, KARL STRAUss.