Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Patent
1992-04-27
1994-02-01
Friedman, Carl D.
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
52183, 52184, 52186, 182 93, 182106, E06C 718, E02D 2912
Patent
active
052823393
ABSTRACT:
An aircraft servicing pit located beneath a surface across which aircraft travel while on the ground is provided with a ladder and a pair of reciprocally retractable handrails on each side of the ladder. Each of the handrails has an inverted "J-shaped" configuration. With the lid open the handrails can be drawn up out of the pit and rotated so that their legs can rest upon the tarmac surface at the edge of the pit. Service personnel utilizing the pit are thereby provided with stabilizing hand grips which enhance their safety when entering and leaving the subsurface chamber within the pit. When the pit is to be closed the retractable handrails are lifted, rotated, and lowered to their fully retracted storage positions.
REFERENCES:
patent: 3786899 (1974-01-01), Zenhauserr
patent: 4907674 (1990-03-01), Miller
Devlin Michael
Johnson Eynon
Canfield Robert
Dabico Inc.
Friedman Carl D.
Thomas Charles H.
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