Receptacles – Closures – Having means for securing or retaining closure in its closed...
Patent
1986-11-14
1987-10-20
Hall, George T.
Receptacles
Closures
Having means for securing or retaining closure in its closed...
220284, B65D 4500
Patent
active
047008660
ABSTRACT:
A pressure locking cap for a pressurized vessel is screw threaded on its periphery for being screwed into a filling opening in the vessel. The top of the cap includes a socket for receiving a wrench for unscrewing the cap. A first piston in the cap communicates into the pressure of the vessel and the piston includes a piston rod which is moved into the socket to prevent insertion of the socket removal tool upon elevated pressure developing in the vessel. In an alternate embodiment, a second piston is placed inside the first piston and also communicates with the pressure of the vessel. A locking element, such as a ball, moves with the first piston through the cap body until the locking element moves even with a recess in the cap body. The second piston is movable, against spring resistance, by elevated pressure in the vessel and the piston is shaped with a tapered shoulder which drives the locking element outwardly into the recess in the cap body for locking the first piston in the upraised condition at which it blocks insertion of the tool into the socket.
REFERENCES:
patent: 4024982 (1977-05-01), Schultz
patent: 4122969 (1978-10-01), Hughey
patent: 4251007 (1981-02-01), Behnisch
patent: 4343325 (1982-08-01), Fallon
patent: 4384655 (1983-05-01), Kendall
patent: 4424915 (1984-01-01), Horn
Bijur Lubricating Corp.
Hall George T.
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