US4473364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprocket wheel
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1982-04-21
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Granted: 1984-09-25
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Expires: 2002-04-21
Abstract
Abstract A sprocket wheel has a plurality of equi-spaced circumferential teeth, each pair of adjacent teeth defining therebetween a pocket. The pockets are shaped to engage with the links of a drive chain. The teeth are formed with flanks at their edge faces which lead and trail during rotation of the sprocket wheel. The flanks merge with rounded faces which define bases of the teeth. The teeth are asymmetrically shaped in such a manner that the rounded faces associated with leading flanks each have a radius of curvature which is greater than the radius of curvature of each of the rounded faces associated with trailing flanks.
Inventors
- 👤 Franz Roling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:54
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/30; F16H55/303
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
A driving sprocket wheel and link drive chain combination wherein the links of the chain are driven by the driving sprocket wheel, comprising: a sprocket wheel having a plurality of equi-spaced circumferential teeth, each pair of adjacent teeth defining therebetween a pocket, the pockets being shaped to engage with the links of the drive chain, the teeth being formed at their opposite edge faces with leading and trailing flanks which lead and trail, respectively, during rotation of the sprocket wheel and which have rounded faces which are curved inwardly toward the center of the teeth to define the bases of the teeth, said flanks merging with said rounded faces, wherein the teeth are asymmetrically shaped in such a manner that the rounded faces associated with leading flanks each have a radius of curvature which is greater than the radius of curvature of each of the rounded faces associated with trailing flanks, and wherein said chain is engaged with said sprocket wheel in such a manner that the trailing ends of all of the chain links engaged in said pockets are contacted and driven by said rounded faces of the leading flanks of the respective teeth following said trailing ends of said links.
Claim 2
Dependent Claim
202 words
A driving sprocket wheel and link drive chain combination wherein the links of the chain are driven by the driving sprocket wheel, comprising: a sprocket wheel having a plurality of equi-spaced circumferential teeth, each pair of adjacent teeth defining therebetween a pocket, the pockets being shaped to engage with the links of the drive chain, the teeth being formed at their opposite edge faces with leading and trailing flanks which lead and trail, respectively, during rotation of the sprocket wheel and which have rounded faces which are curved inwardly toward the center of the teeth to define the bases of the teeth, said flanks merging with said rounded faces, wherein the teeth are asymmetrically shaped in such a manner that the rounded faces associated with leading flanks each have a radius of curvature which is greater than the radius of curvature of each of the rounded faces associated with trailing flanks, and wherein said chain is engaged with said sprocket wheel in such a manner that the trailing ends of all of the chain links engaged in said pockets are contacted and driven by said rounded faces of the leading flanks of the respective teeth following said trailing ends of said links.
Claim 3
Dependent Claim
41 words
A sprocket wheel according to claim 1, wherein the rounded faces associated with leading flanks each have a radius of curvature which is at least approximately twice the radius of curvature of each of the rounded faces associated with trailing flanks.
Claim 4
Dependent Claim
37 words
A sprocket wheel according to claim 1, wherein the rounded faces associated with leading flanks each have a radius of curvature lying in the range of from 1 to 1.5 times the thickness of the chain links.
Claim 5
Dependent Claim
34 words
A sprocket wheel according to claim 3, wherein the rounded faces associated with leading flanks each have a radius of curvature which is approximately 1.25 times greater than the thickness of the chain links.
Claim 6
Dependent Claim
36 words
A sprocket wheel according to claim 2 or claim 3, wherein the rounded faces associated with trailing flanks each have a radius of curvature which is approximately equal to half the thickness of the chain links.
References Cited (Backward Citations)
GB833365A
Cited
US4343614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |