US4058344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground engaging member for movable structures
Assignee: KIRK DYSON DESIGNS Ltd
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Filing: 1976-03-02
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Granted: 1977-11-15
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Expires: 1996-03-02
Abstract
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.
Inventors
- 👤 James Dyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:15
CPC Classifications
B; B60; B60C; B60C5/00; B60C5/007; B60B; B60B19/00; B60B19/14; B62; B62B; B62B1/00; B62B1/18; B62B2202/00; B62B2202/40; B62B2202/404; B62B2301/00; B62B2301/25; B62B2301/252; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/908
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
223 words
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.
Claim 2
Dependent Claim
223 words
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.
Claim 3
Dependent Claim
263 words
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.
Claim 4
Dependent Claim
263 words
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.
References Cited (Backward Citations)
US471405A
Cited
US2404269A
Cited
DE1048747B
Cited
US3094376A
Cited
US3264780A
Cited
US3552760A
Cited
US3827369A
Cited
US3826511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |