United States Patent [191 [1 1] 4,392,319 Ottolini [45] Jul. 12, 1983 [54] SAFETY DEVICE FOR THE TRIGGER Primary Examiner-Charles T. Jordan MECHANISM OF A SHOT-GUN OF THE Assistant Examiner-Ted L. Parr GAS-PUMP TYPE Attorney, Agent, or Firm-Sughrue, Mion, Zinn, Macpeak and Seas [75] Inventor: Leonardo Ottolini, Brescia, Italy [73] Assignee: Luigi Franchi S.p.A., Fornaci, Italy [57] ABSTRACT A safety device for the trigger mechanism of a gas [21] Appl. No.: 313,084 operated-automatic/pump—action-manual shot-gun [22] Filed: Oct. 20, 1981 comprises an over-center thrust spring assembly pivot ally connected at one end to a ?xed point on the gun [30] Foreign Application Priority Data and at the other end to a stop member de?ning lever. Nov. 10, 1980 [IT] Italy ............................. .. 25858 A/8O The thrust spring assembly is pivotable between a first position, in which it biases the said lever into an opera ' "[51] hit. or; ............................... .I. .......... ..'F41c 11/06 tive position, bearing against the breechblock carrier, [52] US. Cl. .............. .. 42/69 B; 42/17 and a second position in which it stabilizes the said lever [58] Field of Search .......................... .. 42/69 B, 16, 17 in an inoperative position, out of the path of movement [56] ' References Cited of the breechblock carrier, preventing rebound of the stop member de?ning lever into the said path. U.S. PATENT DOCUMENTS 1,638,783 8/1927 Philippart ......................... .. 42/69 B 3 Claims, 7 Drawing Figures U.S. Patent Jul. 12, 1983 Sheet 1 of4 4,392,319 I'llp‘,1 1...!.Q ||||Ill .........\. wli.ETIIIH' U.S. Patent Jul. 12,1983 Sheet 2 of4 4,392,319 U.S.- Patent Jul. 12, 1983 Sheet 3 of4 4,392,319 In 3FIB 4,392,319 1 2 spaced from the path‘ of the carrier, undergoes a very SAFETY DEVICE FOR THE TRIGGER rapid “return” angular displacement, which displace MECHANISM OF A SHOT-GUN OF THE ment, in the following description, will be called: re GAS-PUMP TYPE bound-effect displacement. When the re-arming mechanism of a gas-pump shot BACKGROUND OF THE INVENTION gun is actuated manually (pump action) the said re This invention relates to a safety device for the trig bound-effect displacement of the cited stop member is ger mechanism of a shot-gun of the gas-pump type. In of no consequence ‘since, because of the rapidity with this speci?cation and in the claims, by the term: shot which it occurs, the said stop member is safely in the gun of the gas-pump type is meant a shot-gun in which non-operative position spaced from the path of the car the re-arming mechanism may be actuated either auto matically, by the so-called gas-take-off method, or man rier at the moment at which the carrier is displaced ually by the so-called pump-action technique. The re (manually) in the direction of opening of the ?ring arming mechanism of a gun of the type under consider chamber. ' ation generally includes a breechblock mounted on a However, when the re-arming mechanism is actuated carrier guided for movement towards and away from a automatically by the discharge gases drawn from the ?ring chamber, a spring which maintains the breech gun barrel, the displacement of the breechblock and its block in a position in which it closes the ?ring chamber carrier in opening the ?ring chamber is so rapid and so and which resists the movement of the carrier-breech violent that the carrier certainly strikes the free end of block group away therefrom, and a piston for driving the lever-stop member while it is still effecting the said the said carrier-breechblock group against the action of rebound-effect displacement. As a result, the lever-stop the ?ring-chamber—closure spring. When the re-arming member and the trigger mechanism associated there mechanism of the gun is actuated by the so-called gas with may break. take-off method, the piston is subjected to the action of a portion of the discharge gas which is drawn from the OBJECT OF THE INVENTION gun barrel into a cylinder in which the piston is axially movable. When the re-arming mechanism of the gun is The problem which is at the root of this invention is, actuated manually, the piston is made rigid with a fore thus, to devise a safety device for the trigger mechanism end-stock-slide, slidably mounted on the gun itself. A of a shot-gun of the gas-pump type, which is such as to shot-gun of the gas-pump type is further provided with ensure the elimination of the rebound-effect displace a device for converting it from automatic actuation to ment of the lever-stop member, that is to say, which manual actuation of the re-arming mechanism and vice ensures the retention of the lever-stop member in its versa. Such a shot-gun of the gas-pump type is de inoperative position when the carrier is displaced in the scribed in Patent Applications Nos. 22697 3/79 and direction of opening of the ?ring chamber; such a safety 24595 A/8O ?led on the 27th Sept. 1979 and the llth 35 device must, moreover, allow the lever-stop member to Sept. 1980 respectively in the name of the same Appli take up its operative position again, with its free end cant. bearing against the carrier, when the latter is in its posi When a gun is in its ready-to-?re condition, the tion corresponding to closure of the ?ring chamber. breechblock is held in its position in which it closes the ?ring chamber by a positive, removable catch, called a SUMMARY OF THE INVENTION hook in this branch of the art, while the carrier is re tained in a corresponding position by a stop member This problem is solved according to the invention by generally supported by the trigger mechanism housing a safety device for the trigger mechanism of a gas of the gun, More particularly, the said stop member is pump-type shot gun having a breechblock carrier sup constituted by a lever which is ?xed at one end to the 45 porting a breechblock for translational movement be trigger mechanism housing and the other end of which tween a ?rst position in which the ?ring chamber of the bears against the rear wall of the carrier. Such a stop shot gun is closed and a second position in which the member must be of the escape type, that is to say, it ?ring chamber is open, a stop member de?ning lever must be displaceable into a non'operative position to pivoted on the trigger-mechanism housing about an axis allow the carrier to be displaced freely in the direction perpendicular to the direction of movement of the of opening of the ?ring chamber when it is required to breechblock carrier for pivotal movement between an re-arm the gun after ?ring. To this end, the cited stop operative position, in which a free end thereof bears member is connected to the hammer of the gun and against the carrier when the breechblock is in the ?rst follows its anguler displacement. At the moment of position, and an inoperative position in which the said ?ring, as the hammer is angularly displaced to strike the free end lies out of the path of movement of the carrier, ?ring pin, the cited stop member is angularly displaced characterised in that the safety device comprises a about its respective pivot point so that its free end, spring assembly pivotally connected at one end to the which previously bore against the carrier, is displaced said lever and at the other end to a ?xed point on the into a non-operative position, spaced from the said car shot-gun, the straight line of action of the spring assem rier or at least out of the path of movement thereof. 60 From careful observation of the movement of the ham bly extending to one side of a straight line joining the mer towards the ?ring pin it could be seen that, in the said ?xed point to a point on the pivot axis of the said act of striking the ?ring pin, the hammer rebounded lever when the stop member de?ning lever is in its before resting ?nally on the ?ring pin itself. This re inoperative position such that the spring assembly biases bound, although rapid and limited in size, always causes the stop member de?ning lever towards the inoperative an equivalent angular displacement of the cited stop position, the spring assembly being in its condition of member. In essence, at each ?ring, the cited stop mem maximum loading when its straight line of action coin ber, before ?nally taking up its position in which it is cides with the said straight joining line. 4,392,319 3 4 has a curved upper edge 150 which is upwardly convex BRIEF DESCRIPTION OF THE DRAWINGS and constituted by two lateral sections rising towards a Further characteristics and advantages‘ will become central highest portion. The upper curved edge 15a of clearer from the following detailed description of one the arm 15 lies in the path of movement of the carrier 5 embodiment of a safety device according to the inven as will be better understood from the description. below. tion, made with reference to the appended drawings The plate-like lever 10 is angularly displaceable about given purely by way of example, in which: the axis of the pin 9 from an operative position, in which FIG.