Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1995-01-17
1995-11-07
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182111, E06C 744
Patent
active
054640717
ABSTRACT:
A new and improved ladder leveling device comprising a gear box having a plurality of gears coupled to an interior of the gear box on shafts. The shaft of a lowest gear extends outwardly of the gear box. A crank couples with the outwardly extending shaft of the lowest gear. The crank serves to rotate the lowest gear thereby collectively rotating the plurality of gears. A pin selectively couples with an uppermost gear and extends outwardly of the left wall. The pin serves to selectively engage or disengage the three gears. A plate is secured to a lower portion of the gear box. The plate serves to support the ladder's leg. Included in the device is a vertical rack having a plurality of teeth thereon. The vertical rack is secured within the gear box. The plurality of teeth engage the plurality of gears and are optionally raised or lowered by the rotation of the gears when the pin is disengaged. A foot pad is pivotally coupled with the vertical rack. The foot pad serves to lie flat on the ground and stabilize the device. An adjustable clamp is secured to the a wall of the gear box upwardly of the plate. The clamp serves to secure the ladder's leg against the gear box.
REFERENCES:
patent: 2503626 (1950-04-01), Mayberry
patent: 5263699 (1993-11-01), Phoumisavanh
Hauprich William G.
Rice Crispin J.
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