Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1988-02-19
1990-02-20
Massie, IV, Jerome W.
Road structure, process, or apparatus
Pavement
Vault cover-closure
404 72, B65D 5514, E02D 2914
Patent
active
049021656
ABSTRACT:
A rotatable driver cup rotatably mounted in the top plate of a valve box cover or manhole cover with the open top of the cup opening above the top plate and the rest of the cup extending downwardly through a hole in the top plate to a position thereunder, a cup-shaped crank positioned concentrically around the portion of the driver cup that extends below the top plate, but the crank is too large to be pulled up through the hole. The driver cup and the crank are connected together so that they are axially immovable in relation to each other, but such that the driver cup can normally rotate freely in the crank. There are radially aligned apertures in both the driver and the crank, and a lock mechanism, such as a key and tumbler pin type cylinder lock, is positioned in the cup-shaped driver with a lock-actuated, radially extendable and retractable, tongue that can protrude through both apertures in the driver and the crank to engage the driver and crank together. When so engaged, the rotation of the driver will rotate the crank. However when no so engaged, rotation of the driver from above the top plate will not rotate the crank below the plate.
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Massie IV Jerome W.
Smith Matthew
Young James R.
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