Land vehicles – Step or abutment ascending type vehicle – With endless track
Patent
1992-08-24
1993-10-19
Focarino, Margaret A.
Land vehicles
Step or abutment ascending type vehicle
With endless track
B62B 502
Patent
active
052538818
ABSTRACT:
A hand truck stair crawler assembly having a new and novel stair engaging crawler assembly mounted on a conventional hand truck assembly. The stair engaging crawler assembly includes a pair of spaced, cooperating stair crawler assemblies secured to the hand truck assembly, each having a main roller support assembly with a main roller assembly connected thereto. The main roller support assembly includes a pair of spaced bearing retainer plates secured by a plate connector assembly to the hand truck assembly. The main roller assembly includes a plurality of spaced roller bearings mounted within the bearing retainer plates and having an endless belt member mounted thereon for engagement with stairs for traversing thereof. The roller bearing member is of a special design having a central body portion with outer end belt retaining sections to support the endless belt member having contact and support entirely on a plurality of cooperating roller bearing members.
REFERENCES:
patent: 2132069 (1938-10-01), Hall
patent: 2301341 (1942-11-01), Stevens et al.
patent: 2412290 (1946-12-01), Rieske
patent: 4290618 (1981-09-01), Morton
patent: 5042827 (1991-08-01), Mortenson
Focarino Margaret A.
Harper Trucks, Inc.
Mar Michael
Rein Phillip A.
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