Drive in manhole step

Details Drive in manhole step Drive in manhole step

1988-10-31

1989-09-26

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Wall- or floor-attached

Independent rung or step

182 46, E06C 904

Patent

active

048693421

ABSTRACT:
Improvements in plastic coated, steel core reinforced manhole steps; particular improvements in the drive-in or hammer-in ends of a U-configuration manhole step construction, which improvements involve the provision of uniform outer diameter retainer elements on a uniform outer diameter stem for use in either tapered or cylindrical manhole wall holes or openings; combinations of barb-like retainer elements and cylinder-like retainer elements on the drive-in ends of uniform diameter manhole leg ends adaptable for driving into and securing manhole step legs in either tapered or cylindrical manhole wall holes or openings.

REFERENCES:
patent: 4100997 (1978-07-01), Peacock
patent: 4241543 (1980-12-01), Foscarini
patent: 4610330 (1986-09-01), Borst
patent: 4655318 (1987-04-01), Bowen
patent: 4660681 (1987-04-01), Fenhausern
patent: 4702349 (1987-10-01), Fenhausern
patent: 4771861 (1988-09-01), Fenhausern
patent: 4778032 (1988-10-01), Takahashi

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