Fluid handling – Systems – System with plural openings – one a gas vent or access opening
Patent
1976-09-16
1978-08-29
Cline, William R.
Fluid handling
Systems
System with plural openings, one a gas vent or access opening
137587, F16K 4500
Patent
active
041096770
ABSTRACT:
Two forms of device are described for preventing unintentional removal of the contents of mobile tanks before unlocking the vent caps thereof. In one form, a guard unit is provided which is movable between positions permitting or interfering with attachment of a drain conduit to the drain opening. A guard unlocking linkage is provided which includes portions movable between first and second positions respectively, with the vent opening cover being required to be opened before the unlocking linkage can be moved to the second position. When the cover is open and the unlocking linkage can be moved, the guard unit is moved to the position permitting attachment of the drain conduit.
In another form, a locking plate is provided on the vent cover and a notch on the plate registers with a locking device connected to a first hydraulic piston and cylinder assembly. A second piston and cylinder assembly is hydraulically connected to the first assembly, and a guard plate permitting valve opening cannot be moved unless the vent cover is opened and the locking device engages the plate.
REFERENCES:
patent: 1799288 (1931-04-01), Davis, Jr.
patent: 3048189 (1962-08-01), Chandler
patent: 3070123 (1962-12-01), Chandler
patent: 3770011 (1973-11-01), Muehl
patent: 3908718 (1975-09-01), Bower
Cline William R.
Fitzgibbon James T.
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