Technique for pressurizing a sealed article

摘要: A technique for controlling the pressure in a closed, sealed article, such as tennis ball or like. needle having sharp, forward, outer end adapted to puncture article includes passage its rear which terminates flow orifice opens through side of needle, between ends needle. Means are provided at carry resilient sealing plug. The may be attached syringe other appropriate means injecting withdrawing air from article. is punctured by plug-carrying inserted expose interiorly and locate plug within Air introduced withdrawn desired. When desired level reached, withdrawn. arranged so that withdrawn, wall engages frictionally hold it hole effect seal after completely