Adjustable doorway ramp apparatus

Details Adjustable doorway ramp apparatus Adjustable doorway ramp apparatus

1988-09-08

1989-04-04

Novosad, Stephen J.

Bridges

Gangway, ramp, or dock leveler

254 88, 52DIG10, E01D 100

Patent

active

048172243

ABSTRACT:
An adjustable doorway ramp apparatus is set forth wherein a doorway ramp is of a triangular wedge member configuration and includes a first, second, third, fourth, fifth, sixth, and seventh ramp associated therewith. The first ramp is positioned at an uppermost portion of the ramp apparatus and is pivotally mounted in forwardmost portion thereof with a fourth ramp pivotally mounted displaceably rearwardly therefrom by a rack and pinion arrangement. A second ramp is in underlying position to said first ramp and is of a trapezoidal configuration and releasably securable to a third ramp of trapezoidal configuration dimension substantially greater than that of said second ramp. A fifth ramp is positionable between said first and second ramps to arcuately position said first ramp relative to said second ramp with a sixth ramp and seventh ramp slidably mounted within said third ramp for positioning about an associated door sill.

REFERENCES:
patent: 976666 (1910-11-01), Lucas
patent: 1210133 (1916-12-01), Baker
patent: 1262930 (1918-04-01), Diaz
patent: 1568303 (1926-01-01), Webster
patent: 2437479 (1945-11-01), Price
patent: 3153798 (1962-06-01), Drevitson
patent: 3353789 (1966-05-01), Scott
patent: 3994474 (1976-11-01), Finkbeiner
patent: 4329752 (1982-05-01), Forrest

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