B - Operations – Transporting – 60 – B
Patent
B - Operations, Transporting
60
B
16/7
B60B 33/00 (2006.01) B60B 19/00 (2006.01)
Patent
CA 1322832
ABSTRACT According to the preferred form of the invention, a pair of thin wheels is rotatably mounted in the bottom of the body of a caster or other load supporting wheeled device in a bilaterally symmetrical array. Each of the wheels has a downwardly facing outer terrain engaging surface in the general form of a frustocone, and an upwardly facing inner annular bearing surface which is opposed by a complementary annular bearing surface on the bottom of the body. Preferably, one or more antifriction washers such as those made from fluorinated ethylene propylene plastic, such as DuPont Teflon, are interposed between the wheel and body bearing surfaces. This arrangement provides large bearing surface areas which are located directly above the lowermost apex of the frustoconical terrain-engaging surface so that direct vertical loading is applied through the bearing surfaces to the terrain-engaging footprint of each wheel, thereby avoiding cantilever action, avoiding any need for rollable bearings, and permitting the wheels to be very thin and of extremely low profile. The caster or other load supporting wheeled device of the invention Is thereby enabled to have a large-area footprint with a very shallow, gradual tangential relationship to the terrain, thereby minimizing depression into soft terrain, and this is further aided by a contoured glide surface on the bottom of the body which leads from the front end of the body rearwardly to the wheels.
566263
Rivkin Bernard
Yenerich Wesley P.
Rivkin Bernard
Yenerich Wesley P.
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