Road inspection manhole

Details Road inspection manhole Road inspection manhole

1982-06-03

1984-06-26

Leppink, James A.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 19, E02D 2914

Patent

active

044563973

ABSTRACT:
The manhole has a frame 1 with a flange 4 to be embedded in the road and a movable cover 2 to fit in the cylindrical wall 3 of the frame. On its inside the wall 3 has three support surfaces 9 each downwardly sloping at an angle .alpha. to the horizontal in the circumferential direction and at an angle .beta. to the horizontal in the radial direction. Between the surfaces 9 the frame has three undercut surfaces 11 extending radially. On its underside the cover 2 has six surfaces 14, 15. When the cover is on the frame three surfaces 14 are parallel to the corresponding surfaces 9 and the three surfaces 15 are parallel to the corresponding surfaces 11. The surfaces 9, 11 on the frame abut the surfaces 14, 15 by which the cover is held against rocking.

REFERENCES:
patent: 275785 (1883-04-01), Omensetter
patent: 1239704 (1917-09-01), Lee et al.
patent: 4015373 (1977-04-01), Boissier
patent: 4203686 (1980-05-01), Bowman

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