Manhole cover locking bolt construction
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United States of America Patent
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-
Feb 9, 1988
Grant Date -
N/A
app pub date -
Jun 19, 1985
filing date -
Jun 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A manhole cover locking bolt construction for locking a manhole cover to an associated frame including a bolt having a threaded shank and an externally threaded head and an endless curvilinear groove in the top of the head for receiving a key of mating configuration for threading the bolt into and out of the manhole cover frame, and a cap for threadably mounting on the externally threaded head to protect the curvilinear groove against entry of foreign matter.
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