Patent ID: 6044670
Filing Date: 2000-04-04
Classification: A01C,Y10S,Y10T

Abstract:
A combination comprising:an anhydrous ammonia tank;a feed pipe connected to said tank and comprising an interior cylindrical wall forming a pipe bore, said cylindrical wall having an axial end surrounding a pipe opening;an interior flange connected to said feed pipe and having a flange surface presented axially inwardly with respect to said pipe bore;a sleeve having a sleeve side wall surrounding said feed pipe and a sleeve end wall adjacent said pipe opening, said sleeve end wall having a sleeve opening therein;a plug body comprising a first plug member, a second plug member, and a flexible member extending through said sleeve opening, said first plug member having a portion which engages said end wall of said sleeve to limit the extent to which said plug body can extend through said sleeve opening, said flexible member extending axially inwardly beyond said interior flange surface;said first and second plug members being movable from an unlocked position to a locked position;said flexible member being capable of expanding radially outwardly to retentively engage said interior flange surface and prevent removal of said plug body from said feed pipe in response to movement of said first and second plug members from said unlocked position to said locked position;a lock actuator connected to both of said first and second plug members and being movably mounted to said plug body for causing movement of said first and second plug members from said unlocked position to said locked position;said lock actuator having a key receptacle therein, said key receptacle being shaped to receive a key of predetermined configuration;a key of predetermined configuration which fits said key receptacle for moving said first and second plug members between said locked and said unlocked positions.