Patent GB-450234-A (GB)
Title: Improvements in or relating to automatic firearms
IPC: F41A5/18
Filed: 1934-10-03
Abstract: 450,234. Automatic guns. BROWNING CO., J. M. & M. S., First National. Bank Building, Ogden, Utah, U.S.A.-(Assignees of Browning, M. A.) Oct. 3, 1934, No. 28313. Convention date, Feb. 19. [Class 92 (ii)] A transversely-reciprocating cartridge-belt feed-slide 43 is arranged below the belt channel in the feed box and is operated by the engage. ment of a pin 45 on the feed-slide with a continuous cam path 44 in the upper surface of a breech-block operating- slide 27. The invention . is shown applied to a gas-operated gun in which the operating slide 27 forms an extension of the gas-piston rod 28 and is connected to the breech block 49 by links 53, 52. The belt feed-slide and its accessories are described in Specification 133,352, [Class 92 (ii)]. For disassembling the operating slide and the feed slide, the rear plate of the gun is removed by sliding the handle block 6 vertically in grooves 7 in the casing. The operating slide can then be removed rearwardly after the feed slide 43 has been moved laterally so that its pin 45 passes out of the cam groove 44 through a side opening 48a. The Specification as open to inspection under Sect. 91 also describes (1) A breech block 49 connected to the operating slide 27 by links 53 and a hinged locking bolt 52 as in the Browning Automatic Rifle described in Specifications 133,379 and 133,552, [both in Class 119] ; (2) Firing mechanism forming the subjectmatter of Specification 451,069 and comprising a firing pin 50 cocked into engagement with a sear 54 during rearward movement of the slide 27, the sear being released by the slide at the end of its forward movement ; (3) With reference to Fig. 4 (Cancelled), a lever mechanism in the form of toggle-links 21, 22 for moving the gas cylinder 16 rearwardly from a T-shaped guide 20 on the barrel prior to the removal of the barrel which is performed by rotation to disengage the interrupted threads 10, Fig. 2, and forward withdrawal from the cylindrical guide 2<a>. The barrel is locked in operative position by a spring controlled pin 11 ; (4) With reference to Fig. 4 (Cancelled), a buffer engaged by the slide 27 when it returns comprising a conical bush 38 engaging a split conical spring ring 37. The gas cylinder may also be moved slightly rearwards against the action of a buffer 40; (5) With reference to Fig. 20 (Cancelled), a lever 58 pivoted at 59 to the breech bolt for extracting the cartridges from the belt and raising them in guides on the front of the breech block into line with the chamber. The movements of the extracting lever are controlled by a lateral spring pin 65 which, engages a cam surface 66 to raise the extractor and a cam surface 68 to lower it. A rocking member 67 ensures the correct sequence of movements. The extracted cartridge case is moved upwardly in the guides on the face of the breech block by the following live cartridge and is ejected through the opening 68, Fig. 4, by the engagement of an ejector 63 on the breech block with a pin 74 on the casing. An extension 78 of the extractor ensures the raising and ejection of the last cartridge case when there is no following cartridge. This subject-matter does not appear in the Specification as accepted.