TITLE: MECHANISM FOR PERCUTOR INVENTOR: ROGER A. HUNZIKER BACKGROUND OF THE INVENTION 1. Field of the Invention: The present invention refers to mechanisms for firing pin for weapons. 2. Description of the Prior Art: The commonly owned US Pat. No. 5,341,587 is an exemplary mechanism that allows proper cartridge seating in cartridge chambers of a single cartridge cylindrical body for both flangeless and flanged cartridges. Mechanisms of this type were also useful for letting different caliber sockets fire from the same weapon, even from the same cylindrical body of the cartridge. The reliable operation of shooting weapons of all types was very important, but particularly with weapons of this type. There have been problems in the past with inaccurate hammer movement. For example, if the hammer were to travel too far, it could completely pass through the bait in the cartridge, piercing it. This could result in an undesirable recoil of the bolt. Another potential problem with the inaccurate movement of the firing pin was with the hammer entering too deeply and getting stuck in the bait. SUMMARY OF THE INVENTION Briefly, the present invention provides a new and improved mechanism for firing pin for weapons. It can be used with weapons capable of throwing both cartridges with flanges, and without flanges and also cartridges of different calibers. It is also useful with other types of revolvers and weapons. A firing mechanism according to the present invention transfers the impact of the trigger of a weapon to a cartridge bait of a cartridge in a weapon chamber in order to fire the cartridge. The trigger mechanism of the present invention includes a striker which has a tip extending from a body to engage the bait under impact from the trigger. The hammer also has a contact surface, located on its body or placed at the tip, to receive the impact of the gun trigger. The firing mechanism of the present invention also includes a striker case mounted on the weapon. The hammer shell has a receiving chamber in which the hammer body is placed. An opening is formed in the receiving chamber adjacent the bait of the cartridge for the passage of the striker tip out of the bait of the cartridge. The firing pin sheath also includes a forward contact for engaging the cartridge for contacting the bait by the tip of the firing pin and a stop neck which defines a boundary of the advance stroke of the firing pin. A resilient spring or other suitable mechanism is placed between the firing pin and the firing pin sheath. This mechanism serves to push the striker back into the pod receiving chamber, in effect functioning as a return mechanism. The firing pin is returned to a position where the contact surface of the firing pin can be struck again by the gun trigger after a previous firing contact. The hammer mechanism of the present invention also includes a bushing guide mounted on the weapon between the gun trigger and the gun cartridge chamber. The bushing guide has a pod chamber for receiving the firing pin sheath, with an opening forming in the pod chamber for the passage of the advancing contact of the firing pin sheath. The bushing guide also includes a stop for engaging the outer stop neck in the striker case to limit the forward travel thereof in order to avoid over travel and inaccurate tripping. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an elevated view, taken partially in cross section, of portions of a revolver having a firing mechanism in accordance with the present invention. Figures 2 and 3 are elevational views, taken partly in cross section, of the striker and revolver mechanism of Figure 1. Figure 4 is a schematic and enlarged isometric view of the striker mechanism of Figure 1.
Figure 5 is a schematic and enlarged elevated view, taken partially in cross-section, of the striker mechanism of Figures 1 and 4. Figures 6, 7, 8 and 9 are enlarged elevational views, taken partially in cross-section, of the mechanism of the firing pin of Figure 1 in various operating positions. DETAILED DESCRIPTION OF THE PREFERRED MODALITY In the drawings, the letter F generally refers to a mechanism of. hammer according to the present invention. The hammer mechanism F is used to transfer the impact of a trigger M to a bait portion 10 of a dowel or cartridge C in a cartridge chamber 12 in a cylindrical body 14 of a revolver R. The hammer mechanism F transfers said impact in order to cause the C cartridge to be fired. The hammer mechanism F is particularly adapted for use in revolvers R which fire cartridges of different calibers or of different lengths from the same cylindrical body 14. Examples of such revolvers are in commonly owned US Patent Nos. 4,543,741 and 5,341,587, each of which is incorporated herein by reference. As can be seen in the drawings (Figures 2 and 3), a first socket 16 on the cylindrical body of revolver D is a cartridge without flange, while a second socket 18 is a cartridge with flange. The position of the cylindrical body 14 has been adjusted between Figures 2 and 3 so that the ridge flange 18 is adjacent to the hammer mechanism S in Figure 3. In revolvers of this type, a sheath ejector mechanism / positioner E is found in the cylindrical body of the revolver 14. In the embodiment shown, the ejector / positioner mechanism E includes an ejector body 20 positioned on a rear portion 22 of an extractor rod 24 by an adjusting screw 26 and a mounting pin 28. The extractor rod 24 includes a pivot pin 30 at a rear portion for positioning the cylindrical body of the revolver 14 on the revolver R. A spring 32 of the type mentioned in U.S. Patent No. 5,341,587 extends forward from the ejector body 20 and the cylindrical body of the revolver 14 of the revolver R. With the exception of the impact mechanism F according to the present invention, the remainder of the revolver R is of ructure and function similar to revolvers of this type and consequently only parts of them are shown in the drawings. The hammer mechanism F (Figures 4 to 9, inclusive) includes a hammer P, a hammer shell H in which the hammer P is positioned and a bushing guide G in which the hammer shell H is positioned. The hammer P, the H-sheath and the G-guide are formed of a suitable steel strength for use in weapons. The bushing guide G is a generally cylindrical member 34 which is press fit along an outer side wall 36 or otherwise suitably positioned in a structure portion or body 38 (Figures 6-9) of the revolver R between the trigger M and the cylindrical body of the revolver 14. The cylindrical body 34 of the bushing guide G has an inner cylindrical sheath chamber 40 (Figure 5) formed adjacent an inner wall 42. A stop or neck 44 is formed extending inwardly from an advancing portion 46 of the body of the bushing guide 34. An outer or forward wall 47 of the body 34 extends (Figures 6-9) flush with and along a common surface with a wall of advance 48 of the body 38 of the revolver R. The stop 44 has a rear inner wall 49 (Figures 4 and 5) against which a leading end 50 of a helical spring 52 is adapted to be placed. A rear end 53 of the spring 52 is adapted to fit against the striker sheath H. An opening or port 54 is formed in the slide body of the sheath 34 adjacent the stop 44 so that a contact portion of advancement 56 of the sheath of the hammer H can pass through it. The firing pin sheath is a generally cylindrical member 58 positioned within the bushing guide G and having an internally formed receiving chamber 60. The receiving chamber 60 extends rearwardly from a front opening 62 formed in the front contact portion 56. of the striker sheath H. The front contact portion 56 includes a generally planar contact surface 64 formed around the opening 62. The contact surface 64 is adapted to be urged against a back portion 66 (Figure 6-9)., inclusive) of the cartridge C around the periphery of the bait portion 10 of the cartridge C. The hammer shell H also includes a collar extending inwardly 70 formed adjacent the opening 62 backwardly of the contact surface 64. An inner wall 72 of the collar 70 serves as a seat for a leading end 74 of a spiral spring 76 mounted inside the striker sheath H. An annular seat outer surface 77 is formed in the sheath of the striker H to serve as a seat for the rear end 53 of the spring 52. The firing pin sheath H also includes an intermediate interior wall 78 defining the receiving chamber 60 and extending rearwardly from the collar 70 to a stop neck 80 in an elongate rear chamber 82. The spring 76 extends rearwardly in the receiving chamber 60 and the rear chamber 80 of the firing pin sheath H around the firing pin P and has a rear portion 84/8 ada Pitch to be seated against a front seating surface 86 of a travel limit collar 88 formed in an intermediate body 90 of the striker P. The striker P includes a tip 92 located forward of the body 90 and a rear contact surface 94. The rear contact surface 94 of striker P is adapted to have contact with a contact surface 96 of trigger M of revolver R when the revolver is fired in a conventional manner by pulling its trigger. The tip 92 of the firing pin P extends forward from the body 90 and is adapted to transfer the impact which is received at the contact surface 94 from the trigger H through the bait 10 of the cartridge C. The firing pin P tapers towards outside and backward from the tip 92 along a conical surface 96 (Figures 4 and 5) to the seating surface 86 of the collar 88. The collar 88 is of a size that fits inside the rear chamber 82 of the striker sleeve H. However, the travel limit collar 88 is limited in forward movement by the stop neck 80 of the firing pin case H. The firing pin P also has a rear body 98 extending rearwardly from the firing pin. collar 88 to the surface of the contact 94. The structure 38 of the revolver R includes a rear retainer wall 99 which serves as a posterior limit of movement of the travel limit collar 88 of the striker P. In its normal position before the contact on the surface of the trigger 96 (Figure 6), the rear contact surface 94 of the firing pin P extends outward from a rear wall 99 of the structure 88, a distance suitable for securing contact by the surface of the trigger 96, usually around .05". In the operation of the present invention, the trigger M of the revolver R is moved to fire in a conventional manner. The trigger M moves forward and its contact surface 96 hits the rear contact surface 94 (FIG. 7) of the firing pin P, causing the firing pin P to move forward until its surface 86 contacts the stop neck 80 of the firing pin. the firing pin sheath H. At this point, the tip 92 of the firing pin P extends forwardly from the opening 62 of the pod H, a suitable distance to ensure contact of the firing with the bait of the cartridge 10, typically around .020 The sheath H of the firing pin moves forward until its contact surface 64 engages with the bait portion 10 of the cartridge C and the point 62 of the firing pin P strikes the bait of the trigger 10 (Figure 8), causing the cartridge C, in this case a cartridge with flange 18, is triggered.It should be noted that the sheath H of the striker mechanism P can also travel further forward so that in almost all cases it can have contact with a cartridge without re edge 16 (Figure 9). Therefore, the surface 64 can move adequately forward to have contact with the portion of the bait 10., even when the cartridge 16 is recessed in the cylindrical body B. For deep recessed cartridges, the sheath H of the firing pin adequately extends forward so that the firing contact with the bait 10 occurs, even if the surface 64 does not has contact with the cartridge. The advancing movement of the tip 62 of the striker inside the sheath H ensures that the firing contact is made with the bait 10 of the cartridge. This is a particularly advantageous feature when the revolver R is capable of firing any of the various cartridge calibres and both flanged bushings and flangeless bushings. It also serves to prevent the hammer P from penetrating the bait 10 and sticking there. Furthermore, the possibility of retraction of the bolt of a perforated bait 10 is substantially exceeded. The springs 52 and 76 serve to return the sheath H of the firing pin backwards after the cartridge C has been fired. When the pressure of the trigger M is removed on the firing pin P, the spring 76 initially moves the firing pin P backwards in the sheath H and out of contact with the bait 10. The spring 52 moves the firing sheath H back towards its position of rest (Figure 6) in the bushing G. Having described the previous invention, various modifications of the techniques, procedures, material and equipment will be apparent to those skilled in the art. It is intended that all these variations within the scope and spirit of the appended claims be understood by them.