초록 ▼

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 th

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.

대표청구항 ▼

A pressure locking cap, comprising: a cap body having a top portion with a top surface and having a bottom portion, the bottom portion being insertable into an opening in a vessel which may be pressurized; a tool receiving socket defined in the top portion of the cap body extending inward from the t

A pressure locking cap, comprising: a cap body having a top portion with a top surface and having a bottom portion, the bottom portion being insertable into an opening in a vessel which may be pressurized; a tool receiving socket defined in the top portion of the cap body extending inward from the top surface into the cap body, and the socket being shaped so that a tool inserted therein and operated therein may be used for removing the cap from the vessel; a piston disposed in the cap body and including a side thereof opening into the interior of the vessel for being subjected to the pressure in the vessel and the piston including blocking means movable into the socket as the piston is moved through the cap body, the blocking means moving into the socket occupying part of the socket for blocking insertion of the tool into the socket.