Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1978-11-01
1980-09-30
Byers, Jr., Nile C.
Road structure, process, or apparatus
Pavement
Vault cover-closure
404 72, 52 20, 210164, E02D 2914, E01C 2300
Patent
active
042252660
ABSTRACT:
A manhole cover elevating and support ring adapted to be placed within an existing manhole frame for raising the height of a manhole cover, and a method of installing the same. A circular ring is roll formed of metal bar stock with a predetermined size gap. An improved adjustable link is force-fitted within the ring gap to expand the ring outwardly into abutting clamping engagement with an annular wall of a manhole frame to securely mount the ring therein. The improved method includes the steps of radially compressing the ring and restraining the ring in this compressed position. The ring then is placed within a manhole frame opening. The restraining means is removed and the ring expands outwardly toward its normal uncompressed position, thereby clamping itself tightly against the manhole frame. The improved adjustable link and a spring biased keeper also may be installed within the ring gap to insure its clamping engagement with the manhole frame.
REFERENCES:
patent: 1517871 (1924-12-01), Thompson
patent: 2346361 (1944-04-01), Cupido
patent: 3218943 (1965-11-01), Bowman
patent: 3773428 (1973-11-01), Bowman
patent: 3891337 (1975-06-01), McCoy
patent: 4097171 (1978-06-01), Fier
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