Fire escape – ladder – or scaffold – Horizontal traversing - actuation – control – or response – Occupant actuation or control
Patent
1995-10-16
1997-08-05
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Horizontal traversing - actuation, control, or response
Occupant actuation or control
182174, E04B 120
Patent
active
056533055
ABSTRACT:
A self-propelled stepladder including a moveable platform having a front end, a rear end, a front pair of wheels secured the front end, and a rear pair of wheels secured to the rear end; a motor having a rotor and a fixed stator coupled to the platform and with the stator imparting rotation to the rotor when electrically energized; a drive mechanism coupled to the platform for transferring rotational motion from the rotor to the wheels; a battery coupled to the platform for providing electrical energy to the motor; a switch mechanism coupled to the battery, the motor, and the driving mechanism for allowing the motor to be selectively energized and de-energized and for allowing the rotor of the motor to rotate and thereby impart forward or rearward motion to the platform via the drive mechanism; and a foldable step ladder having legs terminated at free ends; and a coupling mechanism for removably coupling the free ends of the step ladder to the platform in an extended and substantially vertical orientation for use.
REFERENCES:
patent: 918553 (1909-04-01), Hoppe
patent: 1149725 (1915-08-01), Burriss
patent: 1517676 (1924-02-01), Haugh
patent: 3026960 (1962-03-01), Koutnik
patent: 3865203 (1975-02-01), Hibma
patent: 4967733 (1990-11-01), Rousseau
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