Manhole insert

Details Manhole insert Manhole insert

1997-12-19

1999-09-28

Lisehora, James A.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, E02D 2912

Patent

active

059576189

ABSTRACT:
A manhole insert wherein gusset (58,60) and (62,64) or offset sections (142,144) and (146,148) anchor pins (94,96) or (158,160) that can be grappled with tools (not shown) to remove the insert. The bottom of the insert includes a conical frustum (40) and an inverted cone (48) or a panel that has a convex inner surface.

REFERENCES:
patent: 3621623 (1971-11-01), Downes
patent: 4305679 (1981-12-01), Modi
patent: 4650365 (1987-03-01), Runnels
patent: 4919564 (1990-04-01), Neathery
patent: 5062735 (1991-11-01), Gaudin
patent: 5328291 (1994-07-01), Wisniewski
patent: 5382113 (1995-01-01), Chilton
patent: 5401114 (1995-03-01), Guggemos
patent: 5727351 (1998-03-01), Neathery et al.

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