Patent US3554340A successfully refreshed from Google Patents.
US3554340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free wheel for a bicycle
Assignee: Shimano Inc
•
Filing: 1969-02-10
•
Granted: 1971-01-12
•
Expires: 1989-02-10
Abstract
Abstract A freewheeling hub apparatus for bicycle having a recess formed by extension of a driving element and a driven element, and in which recess is provided a sealing device which is attachable to the driving element and which has a lip portion which abuts the driven element, thereby to keep out contaminants from the opening between the driving element and driven element.
Inventors
- 👤 Keizo Shimano
- 👤 Masashi Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:37
CPC Classifications
F; F16; F16D; F16D41/00; F16D41/24; F16D41/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
225 words
A free wheeling hub arrangement for a bicycle comprising: a cylindrical bicycle rear wheel hub with external threads at one axial end; a cylindrical rotatable sprocket mounting body with internal threads at one axial end, said external and internal threads couple said rear wheel hub and sprocket mounting body together; a cylindrical rotatable main sprocket body having two axial ends and an axial length longer than said sprocket mounting body, said sprocket body being mounted concentrically on said sprocket mounting body whereby an opening is provided therebetween and a spatial room is formed between the respective ends of said sprocket mounting body and end portions of said sprocket body; bearing means positioned between parts of said sprocket mounting body and parts of said sprocket body; means positioned between said sprocket mounting body and said sprocket mounting body and said sprocket body for enabling said sprocket body to move said sprocket mounting body in one rotational direction for particular conditions and for enabling said sprocket mounting body to move independently of said sprocket means for other conditions; and characterized by cylindrical sealing devices positioned within each of said spatial rooms and attached to said sprocket body, said sealing devices comprising a lip portion extending from said sprocket body toward and abutting said sprocket mounting and covering said opening between said sprocket body and said sprocket body.
Claim 2
Dependent Claim
225 words
A free wheeling hub arrangement for a bicycle comprising: a cylindrical bicycle rear wheel hub with external threads at one axial end; a cylindrical rotatable sprocket mounting body with internal threads at one axial end, said external and internal threads couple said rear wheel hub and sprocket mounting body together; a cylindrical rotatable main sprocket body having two axial ends and an axial length longer than said sprocket mounting body, said sprocket body being mounted concentrically on said sprocket mounting body whereby an opening is provided therebetween and a spatial room is formed between the respective ends of said sprocket mounting body and end portions of said sprocket body; bearing means positioned between parts of said sprocket mounting body and parts of said sprocket body; means positioned between said sprocket mounting body and said sprocket mounting body and said sprocket body for enabling said sprocket body to move said sprocket mounting body in one rotational direction for particular conditions and for enabling said sprocket mounting body to move independently of said sprocket means for other conditions; and characterized by cylindrical sealing devices positioned within each of said spatial rooms and attached to said sprocket body, said sealing devices comprising a lip portion extending from said sprocket body toward and abutting said sprocket mounting and covering said opening between said sprocket body and said sprocket body.
Claim 3
Dependent Claim
37 words
The arrangement of claim 1, wherein a notched annular channel is formed toward one end of said main sprocket body and within said spatial room, and wherein one of said sealing devices is attached to said channel.
Claim 4
Dependent Claim
23 words
The arrangement of claim 1, wherein said lip portions are substantially thinner in cross section than the remaining portions of said sealing devices.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |