Ground engaging member for movable structures
AssigneeKirk-Dyson Designs Ltd.
InventorJames Dyson
Life of this patent
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Abstract
The invention relates to a ground engaging member in the form of a ball for supporting load carrying structures, such as wheelbarrows. The ball is preferably moulded from a plastics material, such as a mixture of EVA and low density polyethylene, and is formed in one piece with sockets for receiving stub axles on the frame of the barrow. The stub axles are non-rotatably mounted in an inner cup-shaped nylon bearing rotatably mounted in an outer cup-shaped nylon bearing fixedly received in a socket. The ball may be moulded with treads and ribs.
Claims2
A wheelbarrow comprising a frame and a supporting ground engaging ball member rotatably mounted therein, said ball member being molded in one piece from a plastic material consisting of a mixture of an ethylene-vinyl acetate co-polymer and a low density polyethylene with diametrically opposite sockets therein, a bearing assembly mounted in each of said sockets, said frame terminating in stub shafts adapted to fit a bearing assembly, said bearing assemblies each having an outer cup-shaped member non-rotatably mounted in a socket with said outer cup-shaped member terminating in an outer peripheral flange for engaging the outer surface of said ball member, said outer cup-shaped member being of a length less than the depth of said socket with the inner end of said cup-shaped member being spaced from the bottom of said socket upon the engagement of said peripheral flange with said ball member, an inner cup-shaped member non-rotatably mounted on said shaft and rotatably mounted in said outer cup-shaped member, said inner cup-shaped member terminating in and outer peripheral flange engaging the outer peripheral flange of the outer cup-shaped member, said inner cup-shaped bearing being of a length less than said outer cup-shaped member with the inner end of said inner member being spaced from the inner end of the outer cup-shaped member upon the engagement of said flanges of said cup-shaped members.
A wheelbarrow comprising a frame and a supporting ground engaging ball member rotatably mounted therein, said ball member being molded in one piece from a plastic material consisting of a mixture of an ethylene-vinyl acetate co-polymer and a low density polyethylene with diametrically opposite sockets therein, a bearing assembly mounted in each of said sockets, said frame terminating in stub shafts adapted to fit a bearing assembly, said bearing assemblies each having an outer cup-shaped member non-rotatably mounted in a socket with said outer cup-shaped member terminating in an outer peripheral flange for engaging the outer surface of said ball member, said outer cup-shaped member being of a length less than the depth of said socket with the inner end of said cup-shaped member being spaced from the bottom of said socket upon the engagement of said peripheral flange with said ball member, an inner cup-shaped member non-rotatably mounted on said shaft and rotatably mounted in said outer cup-shaped member, said inner cup-shaped member terminating in an outer peripheral flange engaging the outer peripheral flange of the outer cup-shaped member, said inner cup-shaped bearing being of a length less than said outer cup-shaped member with the inner end of said inner member being spaced from the inner end of the outer cup-shaped member upon the engagement of said flanges of said cup-shaped members, the outer surface of said outer cup-shaped member formed with cutting fins for engaging the wall of said socket and the inner surface of said inner cup-shaped member formed with a web for engaging a slot on said stub shaft.
Dependencies are inferred from the claim text.