Patent GB-507123-A (GB)
Title: Improvements in single-trigger devices for double-barreled firearms
IPC: F41A19/20
Filed: 1938-07-07
Abstract: 507,123. Double-barrelled guns. FAHLEN, F. T. July 7, 1938, No. 20157. [Class .119] A double trigger, double-barrelled gun has means to allow the firing of the cartridge in each barrel by one and the same trigger, and to permit the cartridge in either barrel to be . fired first. The hammers 3 are cocked by a handle 30 and are held cocked by sears 4, 5 mounted on a common pivot 32. The triggers 6, 7 are mounted on a common pivot 10. A bar 19, guided in a fixed stud 11, is linked at 21 to an-arm 20 mounted on a fixed pivot 22, and provided with a button 23 and spring 24 which can snap into either of two recesses 26, 27, the recess 26 corresponding to safety position, and the recess 27 to firing position for the gun. The bar 19 has a fork 29 which straddles a latch 52 pivoted at 53 between jaws 46, 47, Fig. 4, of an auxiliary sear having' tapered prongs 38, 39 which underlie the inturned ends 33, 34 of the main sears 4, 5. The auxiliary sear is urged forwards by a spring 50 mounted on one of a number of pins on the arm 20. The latch 52 has a pair of pins 55, 56 and a further pin 58 at its forward end. When the button 23 is retracted to place the gun at safety, the forks 29 overlie heels 16, 17 on the trigger blades 13, 14, as shown in dotted lines in Fig. 1, and so prevent the trigger from being operated. The trigger. blades have shoulders 59 against which bear the pin 58 on the latch 52, thus maintaining the auxiliary sear in rear position, the latch being urged in anticlockwise direction by a spring 54 on the auxiliary sear. The button 23 being moved forward, to set the gun in the firing position, the forks 29 move clear of the heels 16, 17 on the trigger blades, and thereafter, if either trigger is pulled, the blade of that trigger directly lifts the inturned end 33 or 34 of the main sear on that side, and fires the cartridge in the corresponding barrel. The operation of the trigger also causes the heel on its blade to engage the pin (55 or 56) and trip the latch 52 so that its pin. 58 rises clear of the shoulders 59 of the triggers, whereupon the auxiliary sear moves forward under the influence of the spring 50 until arrested by contact of one of its jaws (46 or 47) with the raised heel of the operated trigger. The operated trigger is now momentarily released, whereupon the auxiliary sear is free to advance further under the influence of its spring 50, until arrested by contact of the pins 55, 56 with the forks 29. In this position, the jaws 46, 47 on the auxiliary sear . overlie the heels on the trigger blades, and the prongs 38, 39 on the auxiliary sear lie well forward under the main sears. Accordingly, when the first operated trigger (or either trigger) is again operated, the auxiliary sear is tilted upwards about the forward end of the prongs as pivot, thus lifting the unactuated main sear and firing the cartridge in the other barrel. On setting the gun to safety, the auxiliary sear is drawn back by the forks 29 and the pin 58 re-engages behind the trigger shoulders 59 when the hammers are again cocked. According to a modification, the safety lever 20a, Fig. 11, on a fixed pivot .62 is operated, when the hammers are cocked by a cocking lever 30a, by means of a link 65, so that it is always necessary thereafter to move the button 23a forwards before either trigger can be fired.. In this modification, the auxiliary sear is urged rearwards by a spring 67 in a fixed stud 11a, a latch 52a being mounted in a fixed pivot 53a and urged anticlockwise by a spring 51a. The stop pin 58a; Fig. 17, is bent downwardly, and engages stops 73, 74, Fig. 16, in the prongs 38a, 39a of the auxiliary sear. When either trigger is pulled, the trigger blade actuates directly the main sear finger on that side to fire the cartridge in the corresponding barrel and simultaneously lifts the . latch 52a by engagement under the pin 58a, thus allowing the auxiliary sear to move rearwards under the influence of the spring 67 until arrested by engagement of one of the bevel surfaces 69 with the actuated main sear finger. The trigger now being released, momentarily, the actuated sear finger swings downwards, thus allowing the auxiliary sear to move rearwards a further step, in which position both main sear fingers underlie projections 70, 71 on the auxiliary sear. When the first operated trigger (or either trigger) is again operated, the first operated main sear finger is lifted, and swings the auxiliary sear upwards, thereby actuating the other sear to fire the cartridge in the other barrel. On recocking the hammer by the lever 30a, the arm 20a engages a prong 77 on the auxiliary sear and moves it forwards, thereby resetting the pin 58a on the latch 52a into holding engagement with the stop surfaces 73, 74 on the auxiliary sear.