Stair climbing cart

Details Stair climbing cart Stair climbing cart

1979-03-26

1981-04-28

Pekar, John A.

Land vehicles

Step or abutment ascending type vehicle

With spider-type engaging means

188 22, 188 31, B62B 502

Patent

active

042640822

ABSTRACT:
A hand truck is disclosed including unique wheel assemblies for supporting the truck and permitting it to move heavy loads up and down a flight of stairs. Each assembly having three wheels mounted in an equilateral triangle configuration for providing mechanical advantage in moving a load upstairs and braking action when moving the load downstairs. The axle for the wheel assemblies is rotatably mounted to the downwardly extending leg portions of a generally U-shaped heavy metal shroud which is fixed to the upright frame of the hand truck. The hand truck is provided with a locking mechanism for locking the wheel assemblies in a set position including sprockets having a plurality of locking positions mounted on the axle adjacent each wheel assembly. A spring biased lock bar is mounted in the shroud above the sprockets, and it is released for locking engagement with the sprockets by a handle and control linkage mounted to the truck frame thereby holding the truck in a desired inclined position.

REFERENCES:
patent: 651286 (1900-06-01), Williams
patent: 1191394 (1916-07-01), Brown et al.
patent: 1615942 (1927-02-01), Grow
patent: 2706640 (1955-04-01), Marshall
patent: 3063730 (1962-11-01), Domoradzki

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