Automatic vault hatch

Details Automatic vault hatch Automatic vault hatch

1993-04-08

1995-05-09

Kannan, Philip C.

Movable or removable closures

With operator for movably mounted closure

Operating lever or link and closure swing about parallel axes

49139, 49141, E05F 1124

Patent

active

054129087

ABSTRACT:
A utility vault shroud having a hatch cover is provided with a motorized operator for opening and closing a hatch for access thereto. The operator is mounted across the shroud access opening between the side walls thereof with a horizontal shaft which is connected to the hatch cover by pivot arms. In a preferred arrangement a battery back-up is provided for operation during power failure.

REFERENCES:
patent: 4210277 (1980-07-01), Kolt
patent: 4333270 (1982-06-01), Catlett
patent: 4337670 (1982-07-01), Carlson
patent: 4348835 (1982-09-01), Jones et al.
patent: 4735018 (1988-04-01), Duncan et al.
patent: 4871676 (1989-10-01), Yamada
patent: 5018304 (1991-05-01), Longoria

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