Ambulatory ladder

Details Ambulatory ladder Ambulatory ladder

1989-08-01

1990-03-27

MacHado, Reinaldo P.

Fire escape, ladder, or scaffold

Horizontal traversing - actuation, control, or response

Occupant actuation or control

182 16, E06C 1397

Patent

active

049112635

ABSTRACT:
Ambulatory ladder apparatus constructed as a stepladder frame supported on a set of four base wheels. A user-powered drive is mounted under the lowermost step of the ladder, and is mechanically connected with a pair of the base wheels. A drive arm extending from the drive is accessible to a user while aboard the stepladder. By pumping action of the drive arm, the user-powered drive causes rotation of the base wheels, moving the ladder forward. A steering mechanism provided on the drive arm allows the user to direct the motion of the ladder during the pumping action. Thus, without requiring the user to dismount, the ladder may be easily repositioned by operation of the drive, allowing greater work efficiency in many repair, remodeling, painting and construction projects, by eliminating the additional time normally required for dismounting and repositioning the ladder.

REFERENCES:
patent: 808252 (1905-12-01), Padon
patent: 1306546 (1919-06-01), Keeper
patent: 2362170 (1944-11-01), Swaisgood
patent: 2380160 (1945-07-01), Fieroh
patent: 2775488 (1956-12-01), Wingrove
patent: 2845208 (1958-07-01), Antonietti
patent: 3722766 (1973-03-01), Barrineau
patent: 3727720 (1973-04-01), Duc
patent: 3800912 (1974-04-01), Ashworth
patent: 4174021 (1979-11-01), Barlock

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