Recoilless firearm and cartridge therefor |
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| 申请号 | US3738219D | 申请日 | 1970-11-16 | 公开(公告)号 | US3738219A | 公开(公告)日 | 1973-06-12 |
| 申请人 | FEBRES V; | 发明人 | FEBRES V; | ||||
| 摘要 | A recoilless firearm, and round of ammunition therefore, are disclosed. The firearm has a bolt having a bore therein for the passage of exhaust gasses from the firing chamber to an exhaust tube at the rear end of the weapon. The exhaust tube contains a restricted opening, such as a venturi, to counter recoil. The round of ammunition has a single gas discharge opening in its rear end, with the ammunition casing having no apertures in the walls thereof. The use of the recoilless firearm, and round of ammunition therefor, of the present invention allows automatic and semiautomatic weapons to be extremely light while utilizing powerful ammunition propelling charges. | ||||||
| 权利要求 | 1. An automatic firearm of the reduced recoil type comprising: a receiver; a barrel mounted to said receiver and at least partly defining at its rear end a firing chamber loadable with a round of ammunition adapted to discharge gas rearwardly thereof on being fired; bolt means cooperable with the rearward end of said firing chamber and reciprocable in said receiver to extract from said chamber a spent round of ammunition, load thereinto a fresh round and cock said firearm for another firing cycle, said bolt means having a gas passageway extending longitudinally therethrough; yieldable means for urging said bolt means forwardly towards said firing chamber, said bolt means being urged rearwardly of said firing chamber by gas pressure on said bolt means developed in said firing chamber; a reciprocable piston in said passageway and defining a second gas passageway through said piston in communication with said exhaust tube means, and, during at least a portion of the firing of said firearm, with said passageway, said piston being urged rearwardly by gas pressure developed in said firing chamber; and gas exhaust tube means associated with said receiver for receiving gas from said passageway and discharging said gas rearwardly of said firearm. 2. The firearm of claim 1 including sear means associated with said bolt to releasably retain said piston in a rearward position. 3. A firearm as defined in claim 1 including second yieldable means for urging said piston forwardly. 4. A firearm as defined in claim 3 wherein said yieldable means is a bolt recoil spring means and said second yieldable means is a piston recoil spring means. 5. A firearm as defined in claim 4 including cocking means associated with said piston for engaging said bolt after said piston has moved rearward a predetermined distance to move said bolt rearwards and to cock said firearm. 6. An automatic firearm of the reduced recoil locked bolt type comprising: a receiver; a barrel mounted to said receiver and at least partly defining at its rear end a firing chamber loadable with a round of ammunition adapted to discharge gas rearwardly thereof on being fired; bolt means cooperable with the rearward end of said firing chamber and reciprocable in said receiver to extract from said chamber a spent round of ammunition, load thereinto a fresh round and cock said firearm for another firing cycle, said bolt means having a gas passageway extending longitudinally therethrough; yieldable means for urging said bolt means forwardly towards said firing chamber, said bolt means being urged rearwardly of said firing chamber by gas pressure on said bolt means developed in said firing chamber; a reciprocable piston at least partly within said passageway and defining a second passageway extending through said piston in communication with said exhaust tube means and with said passageway during at least a portion of the firing of said firearm; and releasable locking means to lock said bolt in its forward position and releasable by travel of said piston rearwardly a predetermined distance; and gas exhaust tube means associated with said receiver for receiving gas from said passageway and discharging said gas rearwardly of said firearm. 7. A firearm as defined in claim 6 including sear means associated with said bolt for releasably retaining said piston in a rearward position. 8. A firearm as defined in claim 7 including cocking means associated with said piston for engaging said bolt after said piston has moved rearward a predetermined distance to move said bolt rearwardly and to cock same. 9. The firearm of claim 8 wherein said locking means engage said barrel, or an element fixEdly attached thereto, with said bolt by rotation of said bolt, said receiver having a longitudinal axial slot therein, said bolt having a longitudinal and angled locking slot therein, said cocking means attached to said piston and extending through said bolt slot and said receiver slot, whereby reciprocable movement of said piston causes corresponding movement of said cocking means, within said bolt slot and rotation of said bolt to lock and release said bolt by said locking means. |
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