Gun for propelling a drug or medicine projectile |
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| 申请号 | US3745682D | 申请日 | 1971-09-28 | 公开(公告)号 | US3745682A | 公开(公告)日 | 1973-07-17 |
| 申请人 | PNEU DART INC; | 发明人 | WALDEISEN R; | ||||
| 摘要 | A gun assembly for firing projectiles or darts includes a projectile barrel connected to a modified conventional small bored rifle. A gas transfer block connects the barrel wth the rifle to convey exploded expanding gas as a source of propulsion. A restrictive orifice is valved in the transfer block and pressure relieving ports are provided to vent exploding gas and thereby control the velocity of the projectile. A bolt actuator mechanism on the projectile barrel provides an over center locking rod and O-ring sealed bolt for sealingly inserting a projectile into the barrel. | ||||||
| 权利要求 | 1. In combination with a small caliber rifle including a small bore rifle barrel extending from breech means supporting a rifle cartridge for generating an expanding gas to fill said rifle barrel; a projectile barrel overlying said rifle barrel and extending parallel thereto along at least a portion of its length; right angle conduit means intersecting respectively the bores of both barrels; projectile bolt means normally positioned to the rear of said conduit means and defining the position of said projectile prior to firing; a needle valve axially positioned within said rifle barrel at said conduit means for controlling the flow rate of gas from said rifle barrel to said projectile barrel; a vent opening within said projectile barrel forwardly of said bolt; and a disc rotatably mounted on said projectile barrel and having a plurality of circumferentially spaced ports of different areas for selective movement into overlying position with said vent opening for variedly venting a portion of the expanding gas within said projectile barrel. 2. The combination as claimed in claim 1, further including means for inserting the projectile into a firing position in the projectile barrel including said bolt member, an actuator rod and an actuator arm, said actuator rod being pivotably connected to both the bolt member and arm so that it is positioned in a locking over center position when in a closed position for firing of the projectile. 3. The combination as claimed in claim 2, further including three O-rings on said bolt member for sealing the projectile barrel to prevent rearward leakage of the expanding gas. 4. The combination as in claim 2, where the bolt member includes a positioning stud to insure the projectile as clear of the conduit means for firing. 5. The combination as in claim 2, where the actuator arm includes a traversely attached arm for pivotably connecting the actuator rod for an over centered closed position. |
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