Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1989-04-18
1990-10-23
Massie, Jerome W.
Road structure, process, or apparatus
Pavement
Vault cover-closure
49 35, 49465, 292 7, 292 66, 2923363, F16K 3510, E02D 2914
Patent
active
049647555
ABSTRACT:
An improved cover lock apparatus comprises a rotatable and axially slidable crank plate connected to a plurality of retractable lock rods. The crank plate is disposed between the cover and a lock plate and is slidably and rotatably mounted to the lock plate. The crank plate has two upwardly protruding lock pins oriented to engage mating holes in the lock plate and is upwardly biased against the lock plate by a spring. When the lock pins are engaged in these holes, the crank plate cannot be rotated to retract the lock rods. Before the crank plate can be rotated to retract the lock rods, the lock pins must be disengaged from the mating holes in the lock plate by forcibly pushing down on the crank plate via a special lock key to overcome the spring bias that normally holds the crank plate pins in the engaged position. Once the crank plate is pushed downward enough to disengage the lock pins, it can be rotated to retract the lock rods.
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Lewis William F.
Moore Bert R.
Lew-Mor, Inc.
Massie Jerome W.
Smith M.
Young James R.
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