Fluid handling – With lock or seal – Locks against rotary motion
Patent
1986-07-23
1987-07-21
Chambers, A. Michael
Fluid handling
With lock or seal
Locks against rotary motion
137382, 70177, 70212, F16K 3500
Patent
active
046811346
ABSTRACT:
A valve lock for a tank truck comprising an elongated straight length of strap metal having a shorter leg at each end projecting laterally in the same direction therefrom. The shorter leg at one end is secured to an upstream portion of the valve body which connects to the conduit leading from the tank of the truck, and the shorter leg at the other end is releasably secured to the rotary valve operator or valve handle to prevent its movement from the valve closed position to the valve open position until released. The lock device is positioned in such a way that the elongated portion of strap metal bears firmly against a portion of the valve body, such as its outlet spout, to further restrain rotation of the valve operator or valve handle in the direction of rotation which would open the valve. Such restraint substantially lessens the forces that would otherwise be transmitted to the short leg of the device and the means by which it is secured to an upstream portion of the valve body in the event someone attempts to apply force to open the valve and break the lock.
REFERENCES:
patent: 1334987 (1920-03-01), Carpenter
patent: 1339083 (1920-05-01), Wood-Smith
patent: 1496096 (1924-06-01), Mullins
patent: 1714856 (1929-05-01), Douglas
patent: 1947081 (1934-02-01), Grady et al.
patent: 4397332 (1983-08-01), Sample
patent: 4513773 (1985-04-01), Hardiman, Jr.
patent: 4516414 (1985-05-01), Woolvin
Chambers A. Michael
Kettelson Ernest
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