US3818541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Castors
Assignee: Guy Raymond Engineering Co Ltd
•
Filing: 1972-12-29
•
Granted: 1974-06-25
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Expires: 1992-12-29
Abstract
Abstract A castor for attachment to a leg or base of an article of furniture comprising a hollow shell of synthetic plastics material open at the bottom to receive a roller and having two spaced side walls. A shaft is mounted across the side walls of the shell, the shaft having grooved ends which are located in Tsection sockets formed in the inner surfaces of the side walls of the shell so as to be hidden from view and so as to support and retain the side walls of the shell against both compressive and bursting forces. A free running roller is mounted on the shaft and vertical support means are provided on the shell, offset laterally from the shaft for mounting the shell pivotally on a supporting member.
Inventors
- 👤 Raymond Robert James Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:52
CPC Classifications
B; B60; B60B; B60B33/00; B60B33/0036; B60B33/0042
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A castor comprising a hollow, unitary shell of synthetic plastics material open at the bottom and having two generally parallel laterally spaced side walls, an inner surface on each side wall formed with a vertical socket substantially T-shaped in cross section extending upwardly from the open bottom of the shell, integral restriction means spaced from the bottom of each socket, a shaft extending across said side walls provided with an annular groove adjacent each end forming end portions to fit said sockets between said restriction means and the socket bottom whereby movement of said shaft along said sockets is resisted by said restriction means so As to retain said shaft in position, said shaft positively tying the side walls of the shell together and supporting same against compressive and twisting forces, a free running roller on said shaft, and vertical support means on said shell laterally offset from the axis thereof for mounting the shell pivotally on a supporting member.
Claim 2
Dependent Claim
160 words
A castor comprising a hollow, unitary shell of synthetic plastics material open at the bottom and having two generally parallel laterally spaced side walls, an inner surface on each side wall formed with a vertical socket substantially T-shaped in cross section extending upwardly from the open bottom of the shell, integral restriction means spaced from the bottom of each socket, a shaft extending across said side walls provided with an annular groove adjacent each end forming end portions to fit said sockets between said restriction means and the socket bottom whereby movement of said shaft along said sockets is resisted by said restriction means so As to retain said shaft in position, said shaft positively tying the side walls of the shell together and supporting same against compressive and twisting forces, a free running roller on said shaft, and vertical support means on said shell laterally offset from the axis thereof for mounting the shell pivotally on a supporting member.
Claim 3
Dependent Claim
19 words
A castor as claimed in claim 1, wherein said integral restriction means comprises cam faces in said socket walls.
Claim 4
Dependent Claim
71 words
A castor as claimed in claim 1, wherein said roller comprises two similar, unitary portions of synthetic plastics material independently rotatable on said shaft and completely filling the width and depth of said shell, said portions having flat closely arranged inner faces in sliding engagement with each other for militating against ingress of foreign matter therebetween, and exterior annular surfaces on said portions cooperatingly shaped to provide a convex rolling surface.
Claim 5
Dependent Claim
42 words
A castor as claimed in claim 3, wherein each roller portion comprises a flat outer wall and flat side walls on said shell arranged in close parallel juxtaposition to said flat outer walls respectively to minimize the entrance of foreign matter therebetween.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |