Patent GB-1461424-A (GB)
Title: Automatic firing weapons
IPC: F41A7/06
Filed: 1974-10-31
Abstract: 1461424 Automatic weapon WERKZEUGMASCHINENFABRIK OERLIKON-BUHRLE AG 31 Oct 1974 [1 Nov 1973] 47280/74 Heading F3C An automatic firing weapon is equipped with an electric motor 34, Fig. 4, and with an electromagnetic coupling 61, 72, Fig. 5, to move the breechblock 4, 5, Fig. 1, into its cocked position, and has an electric switch 51, Fig. 6, which, when the breechblock 4, 5, Fig. 1, reaches the cocked position, disconnects the coupling, the weapon also has an overload device 45, 50, Fig. 4, which, upon exceeding a predetermined value of the displacement resistance of the breechblock 4, 5 actuates the electric switch 51, Fig. 6, for disconnecting the coupling 61, 72, Fig. 5. A transmission arranged between the motor 34, Fig. 4, and the coupling 61, 72, Fig. 5, includes a worm 40 and a worm-gear 54. The worm 40 is axially displaceable against a spring 45, Fig. 4, and has a portion 50, Fig. 6, which is engageable with a pusher member 53 of the switch 51. In use when the breechblock 4, 5 is in the forward position as shown in Fig. 2 its body 5 is locked with the barrel 22 of the weapon, a control bolt 30 is located at the rear end of control grooves 31, and a previously opened switch 73, Fig. 7, is closed. A current flows in the magnetic coil 72 and an armature 57, Fig. 5, which is guided by bolts 56, is attracted by a magnetic body portion 63, of a magnetic body, and a toothed-rim 66 of the portion 63 meshes with a toothed-rim 62 of the ring 57. The motor 34, Fig. 4, drives gears 36, 37, 38 and 44, the rotating gear 44, being mounted on a shaft 41 which extends from a worm 40, causes the worm to rotate a worm-gear 54. The latter actuates the armature ring 57, Fig. 5, and, consequently, the magnetic body portion 63, a magnetic body portion 64 of the magnetic body, which carries the magnetic coil 72 of the electromagnetic coupling 61, 72, remaining stationary. A sprocket wheel 16, Fig. 1, which drives a chain 15, is driven by the magnetic body portion 63, Fig. 5, via a shaft 67 and a carrier 4, Fig. 2, of the breechblock 4, 5 is displaced rearwards by an entrainment member 12 which is connected with the chain 15, is mounted on a rod 8, Fig. 1, and is urged by a spring 14 mounted on the rod 8. The control bolt 30 displaces in the control grooves 31, the body 5 rotates in carrier sleeve 27, the blocking action between the body 5 and the barrel 22, Fig. 2, is eliminated, and the body 5 moves rearwardly. When the breechblock 4, 5 impacts against a shock-absorber 7, Fig. 1, which is carried by breechblock housing 2, the carrier 4 is urged forwardly and force is transmitted via the chain 15 through the gear 16, the shaft 67, Fig. 5, the magnetic body portion 63, the armature ring 57 and the worm-gear 54 to the worm 40, the latter being moved axially against the pressure of springs 45, Fig. 4. Consequently, a portion 50 of a shaft projection 42 which extends from the worm 40 slides along the pusher element 53, Fig. 6, of the switch 51 so as to open the latter and interrupt the current supplier to the motor 34, Fig. 4, and the magnetic coil 72, Fig. 5. The armature ring 57 is now moved back into the rest position by springs 60, and the toothed rim 62 of the ring 57 is disengaged from the toothed rim 66 of the magnetic body portion 63. The breechblock 4, 5 is moved forwardly by a spring 6, Fig. 1, away from the shock-absorber and, having a catch-notch 75, is retained by a hook 19 which is pivotally mounted on the housing of the shock-absorber 7 and is urged by a spring 20. The entrainment member 12 is moved forwardly from the breechblock carrier 4 by the spring 14 until impacting against wall 10, Fig. 2 of the breechblock housing 2, and the chain 15 is entrained and runs over the gear 16. Similarly the cocking operation for the breechblock 4, 5, Fig. 1, is interrupted when, during its rearward movement, a resistance to movement exists.