US1180784A - Rotatable breech-bolt for automatic firearms. - Google Patents

Description

P. MAUSER, DECD.

r. EICHHORN, ADMINISTRATOR. ROTATABLE BREECH BOLT FOR AUTOMATIC FIREARMS.

APPLICATION FILED DEC. 1. 1914.

Patented Apr. 25, 1916.

lllllllljj UNITED STATES PATENT OFFICE.

PAUL MAUSER, DECEASED, LATE OF OBERNDORF-ON-THE-NECKAR, GERMANY, BY

5 FRIEDRICH EICHHORN, ADMINISTRATOR, 0F OBERNDORF-ON-THE-NECKAR, GER- MANY, ASSIGNOR TO WAFFENFABRIK MAUSER AKTIENGESELLSCHAFT, 0F OBERN- DORF-ON-THE-NECKAR, GERMANY, A CORPORATION OF GERMANY.

Specification of Letters Patent.

ROTATABLE BREECH-BOLT FOR AUTOMATIC FIREARMS.

Patented Apr. 25, 1916.

Application filed December 1, 1914. Serial No. 875,051.

To all "whom it may concern Be it known that PAUL Mimsnuydeceased, late a subject of the King of Vurttemberg and residing at ()berndorf-on the Neckar, in the Kingdom of Wurttemberg, Germany, invented certain new and useful Improvements in Rotatable Breech-Bolts for Automatic Firearms, of which the following is a specification.

This invention relates to a further development of the rotatable breech bolt for automatic fire arms with fixed barrel shown in an application of the said Paul Mauser filed February 12, 1914, Serial No. 818,235, wherein a positive locking is attained in that the breech bolt having the nipples cooperates with a longitudinally movable locking part. which in the locking position and by the controlling of the nipples locks the breech bolt against rotation and is re leased from its locking position only by the shot.

The subject matter of the present inven-' tion relates to the arrangement wherein the locking part does not lock the breech bolt directly but through the medium of a pawl inserted between the locking part and the breech bolt, such pawl in its inner position controlling the movement of the bolt nipples and being positively rocked inwardly and outwardly bythe locking part in its longitudinal movenient.

This improvement is shown in the accompanying drawing.

Figure 1 is a plan of the breech bolt with its parts in the locking position, the pawl being disposed inwardly and the rod controlling the movements of the pawl in the locking position. Fig. 2 is a front elevation. Fig. 3 is a side elevation to Fig. 1. Fig. 4 shows the position after the shot with outwardly disposed pawl and advanced rod. Figs. 5 and 6 are plan and interior views respectively of the sliding control-rod.

According to this invention, the breech bolt .70 carries the bolt head '0 with the rotatable or locking nipples Q0, while the locking parts, which effect the positive locking, cooperate with the bolt head T. For the maintenance of the gas-tight breech bolt while the projectile is still in the barrel, there is provided a pawlt which is pivoted behind the bolt head to the breech bolt and is controlled in its action by the longitudinally movable rod 8. .In the locking position of the parts i. e. before and during the firing, the nipple w is controlled by the front arm of the pawl provided with a bevel t the rod 8 is now in the rearward position, so that it secures with its inwardly bent head 3 the arm of the pawl in its controlling position. The rear arm of the pawl t has a proj ection 25 which bears within a longitudinal recess 3 of the rod 8'. If, after the firing, the rod 8 advances through its inertia, its head 8' will relase the arm of the pawl; owing to the action of the cam surfaces in the recess .9 of the rod 8 on the projection t of the rear arm of the pawl, the pawl is actuated in such a manner that its front arm is rocked outwardly clear of the nipple w, whereby the bolt head is released for rotation. The projectile has then left the barrel and the unlocking as well as the backward movement of the breech bolt can take place normally under the action of the existing pressure. The rod 8 is provided with an upwardly disposed push button 8 for being operated by hand when loading for the first time so that the advancement of the rod 8 and the return of the breech bolt can be effected by a grip with the right l1 and. 7

What is claimed is:

1. A breech mechanism for fire arms, comprising a brcech piece, said breech piece having a rotary part having locking lugs thereon, and means for locking said breech piece in position to close the breech, said means comprising a part on said breech piece adapted to move into and out of position to prevent rotation of said rotary part, and an inertia piece adapted to retain said locking part on the breech piece in locking position.

2. A breech mechanism for fire arms, comprising a breech piece, said breech piece having a rotary part having locking lugs thereon, and means for locking said breech piece in position to close the breech, said means comprising a part on said breech piece adapted to move into and out of position to prevent rotation of said rotary part, and an inertia piece adapted to retain said locking part on the breech piece in locking posiposition, and the incline of the gro ves bemove on recoil of the fire arm ing a part on said breech piece adapted to move. into and outof position to prevent rotation of said rotary part, and an inertia piece adapted to retain said locking part on the breech piece in looking position, said in ertia piece being adapted to move on recoil of the fire arm out of position to retain said locking part on the breech piece in locking ing such that the pressure of the ga in' the fire arm is suflicient toturn said rotatable part of the breech piece in said inclined grooves and open the breech.

4. A breech mechanism for fire arms including a breech piece; said breech, piece having a rotary part having lugs thereon, and means for locking said breech piece in position to close the breech, said means comprising a part pivotally mounted on the breech piece adapted to move into and out of position to prevent rotation of said rotary part, and an inertia piece adapted to retain said pivotally mounted part in locking-position, said inertia piece being adapted to move on recoil of the fire arm out of retaining position. v

5. A breech mechanism for fire arms comprising a breech piece, said breech piece having a rotary part having locking lugs thereon and means for locking said breech piece in position to close the breech, saidmeans comprising a two armed lever pivotally mounted on the breech piece, one arm of which is adapted to move into and out of position to prevent rotation of said rotary part, and an inertia; piece adapted to retain said lever in locking position, said inertia piece on \recoi'l of the fire arm being. also adapted to contact with one arm of said lever to move sald lever out of locking position.

6. A breech mechanism for fire arms com-' prising a breech piece said breech piece having a rotary part having locking lugs there on, and means for locking said breech piece in position to close the breech, said means comprising a part on i-said breech piece.

adapted to move into and rout of position to preventrotation of said rotary part.

' 7. A breech mechanism for firearms comprising a breech piece, said breech piece having a rotary 'part having locking means thereon, and means on said breech piece for locking said rotary part against rotatiom 8. A breech mechanism for fire arms comprising a breech piece,; said breech pie'oehav ing a rotaryv part having locking means thereon,- and means on said breech piece forff locking said' rotar part against rotation, and an inertia part controlling the action of said locking means.

9. A fire arm comprising, a" breech bolt having a rotatable'part, andmeans for preventing rotation of said' rotatable part, said means comprising a pawl adaptedto engage the rotatable part and an'inertiapart con-' trolling the action of said pawl.

, 10. A fire arm compri ing a breech bolt having a rotatable part, and means for preventing rotation of said rotatable part, said means comprising a pawl adapted to engage the rotatable part and an inertiaslide having a. projection adapted to engage behind said pawl and adapted to move from behind said pawl under the force of inertia.

11. A fire arm comprising abreech bolt; having a rotatable part, and means for pre venting rotation of said rotatable part, said means comprising'a pawl adapted to engage the rotatable part and an inertia part controlling the action of said pawl, said inertia part having means for positively moving said pawl to releasing position. I d

12. A fire arm comprising a breech bolt,

said breech bolt having a rotatable and a non rotatable part, means for preventing rotation. of said rotatable part, said means comprising. a part carried by the non-rotatable part of said breech bolt.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

FRIEDRICH EICHHORN, Administrator of the estate of Paul M auser,

deceased.

n I W1tnesses ER'NnsT- ENTENMANN, FRIDA KLAIBER.

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