Manhole cover locking bolt construction

Details Manhole cover locking bolt construction Manhole cover locking bolt construction

1985-06-19

1988-02-09

Suchfield, George A.

Road structure, process, or apparatus

Pavement

Vault cover-closure

411397, 411402, 411910, E02D 2914

Patent

active

047238666

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.

REFERENCES:
patent: 887591 (1908-05-01), Cook
patent: 1059326 (1913-04-01), Ackermann
patent: 3874258 (1975-04-01), Semola et al.
patent: 4145151 (1979-03-01), Helms
patent: 4480513 (1984-11-01), McCauley et al.

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