Manhole riser

Details Manhole riser Manhole riser

1978-07-28

1979-03-13

Byers, Jr., Nile C.

Road structure, process, or apparatus

Pavement

Vault cover-closure

E02D 2914

Patent

active

041439880

ABSTRACT:
A manhole extension or riser for increasing the height of manhole cover frames when a roadway is resurfaced. It includes roadbed piercing anchors attached to the periphery of a simple ring increasing the height of the frame. The anchors, made of flat steel plates cut into trapezoids, act to lock the riser in place when the new road surface is laid down. A second ring is used to increase the height of the cover support lift.

REFERENCES:
patent: 1458391 (1923-06-01), Burton
patent: 2431082 (1947-11-01), Sayles
patent: 3326100 (1967-06-01), White
patent: 3331295 (1967-07-01), Sorrell
patent: 3611889 (1971-10-01), Levinson

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