Abstract:
The arrangement for emergency actuating of the firing pin of a machine cannon having an exterior drive includes a percussion hammer that is loaded by a coil spring for the direct loading of the firing pin mounted in the breech block via an intermediate rod member. When in a loaded position and therefore ready for an emergency actuation, the percussion hammer is secured in its operating position by means of an arresting spring which engages with a pair of diametrically opposite nose members into an abutments forming part of the breech housing.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to an arrangement for the emergency actuation of a firing bolt in a machine cannon having an exterior drive. 
     Machine cannons with exterior drives already are known and described in our published German patent application No. DE 3307882 (which corresponds to copending U.S. patent application Ser. No. 729,996 now U.S. Pat. No. 4,683,799. The energy required for driving such a weapon is supplied by an outside energy source, for example, an electric motor or a compressed air driving mechanism. In emergency cases, that is, when the exterior source of energy fails, the weapon needs to be capable of at least of firing single shots. For this purpose a manual drive is provided. This drive can, however, only effect block movement and an advance the ammunition transport mechanism. The energy actuating the firing bolt can, however, not be supplied with this manual driving mechanism. 
     SUMMARY OF THE INVENTION 
     It is an object of this invention to provide an arrangement which in emergency cases can also provide a manual actuating of the firing pin or bolt, so that when a malfunctioning or failure of the exterior energy drive source occurs it is possible to continue to fire the weapon. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other features and advantages of the invention will become more readily apparent from the following, reference being made to the accompanying drawing, in which: 
     FIG. 1 illustrates in cross section the breech block in breech housing of the weapon; 
     FIG. 2 is a cross sectional longitudinal view of a first embodiment of the arrangement of the invention; 
     FIG. 3 is a cross sectional view along line A-B in FIG. 2; 
     FIG. 4 is a partial cross sectional view of the arrangement shown in FIG. 2; 
     FIG. 5 is a side elevational view of the lever for actuating the arrangement of FIG. 2; 
     FIG. 6 is a longitudinal sectional view of a further embodiment of the invention; 
     FIG. 7 is a top-plan view of the parts of the arrangement of FIG. 6 that are illustrated in side elevational view in FIGS. 8 and 9 of the second embodiment of the invention illustrated in FIG. 6; 
     FIG. 8 is a cross sectional view of a part of the arrangement of FIG. 6; 
     FIG. 9 is a side elevational view of the part of the arrangement illustrated in FIG. 8. 
    
    
     DETAILED DESCRIPTION 
     FIG. 1 illustrates in cross section essentially only a portion of the weapon, that is, its breech housing 10, which is connected with gun barrel 13, which has only been partially illustrated. A breech block 12 is shown as being reciprocally slidably mounted in the breech block housing 10. The breech block 12 closes in its forward-most position on the loading chamber 14 of the gun barrel 13, as described in our copending application Ser. No. 729,996 now U.S. Pat. No. 4,683,799. Through shafts 16, 16&#39; mounted respectively on the axes 15, 15&#39;, extend parallelly and bilaterally with respect to the breech block 12 and also extend parallel to the breech block movement. These two shafts 16, 16&#39; are driven by non-illustrated driving means, for example, meshing gear wheels, by means of an exterior energy source, for example, an electric motor (not illustrated), to be thereby rotatably driven. The shafts 16, 16&#39; have cams 17, 17&#39; disposed along their cylindrical exterior surfaces, which cams control the firing cycle of the weapon. These cams 17, 17&#39; engage with projecting nose members 18, 18&#39; of the breech block 12 to thereby effect a reciprocal movement of the breech block 12 within the breech block housing 10. 
     In case of emergency, that is, during malfunctioning of the exterior energy source, the shafts 16, 16&#39; can be manually rotated by means of a non-illustrated manually actuatable driving arrangement. By so rotating the shafts 16, 16&#39;, the required movement of the breech block 12 for the proper functioning of the weapon can also be effected. However, with this emergency drive, the weapon functioning is drastically slower than during normal operation. During emergency drive conditions generally only single shots can be fired. The emergency energy provided for the manual drive does not suffice for actuation the firing pin 12&#39; out of the breech block 12. Therefore, a further arrangement for this manually actuation must be provided. The first embodiment of such an arrangement is illustrated in connection with FIGS. 2 and 5. The arrangement for the emergency actuation of the firing pin 12&#39; in accordance with FIG. 2, is already schematically illustrated in FIG. 1. As can be noted, it is coaxially arranged in at least one of the two hollow shafts 16, 16&#39;. The arrangement includes a percussion hammer 20, which is biased by coil spring 21, which is biased against a counter support 24. This support 24 in turn bears against the drive shaft 25 which is not actually slidably displaceable. The recoil of the weapon, after firing a shot, causes the percussion hammer 20 to move backwards, whereby simultaneously the coil spring 21 is loaded. This loaded condition of the coil spring 21 is secured by means of the arresting means 23. The arresting means include a longitudinally, axially movable arresting rod 23a which is movable from a first position within the coil spring 21, and a dual-leg arresting spring 23 which is operatively joined to the arresting rod 23a. The arresting spring 23 is mounted on pivot pin 23b and is joined via said pin to the arresting rod 23A. Each leg 23c of the arresting spring 23 is biased radially outwardly by means of a radially outwardly directed spring force. Each leg 23c of the arresting spring 23 is bow-shaped and supports a radially outwardly projecting nose, 23d, which, in a loaded condition of the spring 21 abuts against a projection or abutment 26 for purposes of securing the arresting rod 23a. The free ends of the legs 23c of the arresting spring 23 project into mouth-shaped opening of coupling rod 28, which is slidably mounted in the emergency actuating arrangement and adjoins in the axial direction the arresting spring 23. This is particularly well illustrated in the cross sectional view on FIG. 3. The coupling rod 28 is joined with a coupling 27 (FIG. 4) which is actuatable by means of a lever 46 (FIG. 5). FIGS. 4, 5, are to be considered jointly with FIG. 2 and are really disposed above it and are not shown in this fashion for lack of space the lever 46 represents the end piece of the arrangement in accordance with FIG. 2 and a cross sectional, respectfully side elevational view of it is shown. For emergency actuating of the weapon, at closed breech, the coupling rod 28 is released by means of the coupling lever 46 and the coupling 27 and is slidable moved in an axial direction onto the arresting spring 23. During this operation, the mouth-like opening 28a of the coupling rod 28 slides over the free ends of the legs 23c of the arresting spring 23 and thereby squeezes them together in a radial direction, so that the noses 23d of the legs 23c can slide past the abutment 26 and thereby release the arresting mechanism. Thereafter, the release coil spring 21 propels forwardly and accelerates the percussion hammer 20 which transfers the released energy of the coil spring 21 via a spring-loaded annularly arranged percussion member 111 onto the firing pin 12&#39; of the breech block 12. The firing pin 12&#39; can now ignite in a known manner an ignition fuse of a cartridge or projectile disposed in a cartridge or projectile loading chamber by impacting the fuse of the ammunition unit so that also in case of an emergency operation a shot can be fired. The release and forward propelling coil spring 21 which, as has been previously described, impacts on the percussion hammer 20, accelerates thereby simultaneously the arresting rod 23A in an axial direction, which does thereby loads the coil spring 22 and biases it. During recoil of the weapon, they are again biased via the skewed contact surfaces 110 and 119 of the percussion member 111 and percussion hammer 20, the coil spring 21 is again biased thereby simultaneously the coil spring 22 unloaded thereby rearwardly moving the arresting rod 23a in an axial direction until the noses 23d of the legs 23c of the arresting spring 23 snap past the abutment 26 and return to their arrest position and the arresting means are thereby brought into their holding position. In the above-described embodiment of the invention, a considerable wear of the moving parts can be expected since the arrangement for emergency actuating of the firing pin is also loaded during normal firing at recoil of the weapon, despite the fact that the emergency actuating arrangement is used only in cases of emergency. 
     In the embodiment of the invention, which is illustrated in FIGS. 6-9, there are means provided to reduce the wear and thereby the useful life of the weapon, in particular those parts of the weapon forming part of the emergency actuating arrangement. The arrangement according to FIG. 6 does again include a percussion hammer 20 which is joined to a percussion member rod 20a . A coil spring 21, which coaxially surrounds the percussion member rod 20a, biases the percussion member 20 and pushes, on the other side, in an axial direction against a nonslidably displaceable drive shaft 68. The percussion member rod 20a is joined via the toothed rod 63 and an axial roller bearing 60 (FIGS. 6 and 8) which meshingly engage with a gear 64 which can be rotated by a means of a manual drive. The gear wheel 64 is mounted on an axial shaft 64a and further includes a ratchet wheel 65 whose rotational movement is controlled by means of a ratchet pawl 66. In case of emergency, the ratchet pawl 66 can be released by manual actuation and thereby the ratchet wheel 65 is released so that the coil spring 21 can be unloaded. 
     In this manner, the energy which is stored in the cross spring 21 is transferred via the percussion rod member 20a and the percussion hammer 20 as well as the intermediate percussion member 111 onto the firing pin 12a of the breech block 12 (FIG. 1). During normal firing, the coil spring 21 is not additionally biased in this second embodiment of the invention by means of the weapon recoil, since the stroke of the percussion rod 28 is larger than the weapon recoil. In this manner, the emergency actuation arrangement only subjected to a very reduced wear. 
     Although the invention is described and illustrated with reference to a plurality of embodiments thereof, it is to be expressly understood that it is in no way limited to the disclosure of such preferred embodiments but is capable of numerous modifications within the scope of the appended claims.