Land vehicles – Wheeled – Extensible
Patent
1995-06-16
1997-05-06
Camby, Richard M.
Land vehicles
Wheeled
Extensible
280 4718, 280655, B62B 104
Patent
active
056263511
ABSTRACT:
A collapsible hand cart including a base frame unit, a telescopic handle pivoted to the base frame unit in the middle, two steering mechanisms mounted on the base frame unit at two opposite sides for moving the base frame unit by the telescopic handle, each steering mechanism including a wheel holder turned about a pivot on the base frame unit to hold a roller, a movable member turned about a pivot on the wheel holder, and a link having a pivot hole at one end connected to the movable member and the base frame unit by a pivot and an elongated sliding slot connected to a bolt on a slide, which slide is moved vertically in a longitudinal sliding slot on the telescopic handle, wherein when the hand cart is collapsed, the wheel holders and movable members and links of the steering mechanisms and the telescopic handle are received together in the X-axis direction; when the telescopic handle is lifted to the Z-axis direction and extended out, the links are lifted, causing the movable members to force the wheel holders toward the Y-axis direction.
REFERENCES:
patent: 1116086 (1914-11-01), Lewis
patent: 2521819 (1950-09-01), Baer
patent: 4431211 (1984-02-01), Carrigan
patent: 4478429 (1984-10-01), Adams
patent: 4540196 (1985-09-01), Paping et al.
patent: 4917392 (1990-04-01), Ambasz
patent: 4969660 (1990-11-01), Spak
patent: 5348325 (1994-09-01), Abrams
patent: 5468005 (1995-11-01), Yang
Camby Richard M.
Vanaman Frank
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