US3817113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain drive with idler wheel tensioning means biased by elongated pads
Assignee: Sulzer AG
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Filing: 1972-01-05
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Granted: 1974-06-18
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Expires: 1992-01-05
Abstract
Abstract The chain drive has one run deflected and biased about a tensioning wheel which is mounted on a pivotal support. The support is, in turn, mounted on a pivot axis by means of an elongated tension spring element made up of a pair of concentric tubes and a resilient material between the tubes. The resilient material allows deflection of the support when an abrupt tension force is imparted to the chain as in the case upon braking.
Inventors
- 👤 E Pfarrwaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:35
CPC Classifications
F; F16; F16H; F16H7/00; F16H7/08; F16H7/10; F16H7/12; F16H7/1254; F16H7/1281; F16H2007/0802; F16H2007/0819; F16H2007/0863; F16H2007/0874; F16H2007/0876; F16H2007/088
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A chain drive including a support pivotally mounted about a pivot axis transverse to said support; a toothed chain tensioning wheel rotatably mounted on said support for engaging a travelling chain; and an elongated torsion spring element secured to said support about said pivot axis and extending longitudinally outwardly on both sides of the plane of said support parallel to said pivot axis, said tensioning wheel being disposed in a central plane perpendicular to said pivot axis with said plane passing through the center of said torsion spring element, said spring element including a pair of concentric tubes and a plurality of elongated pads of material between said tubes.
Claim 2
Dependent Claim
109 words
A chain drive including a support pivotally mounted about a pivot axis transverse to said support; a toothed chain tensioning wheel rotatably mounted on said support for engaging a travelling chain; and an elongated torsion spring element secured to said support about said pivot axis and extending longitudinally outwardly on both sides of the plane of said support parallel to said pivot axis, said tensioning wheel being disposed in a central plane perpendicular to said pivot axis with said plane passing through the center of said torsion spring element, said spring element including a pair of concentric tubes and a plurality of elongated pads of material between said tubes.
Claim 3
Dependent Claim
32 words
A chain drive as set forth in claim 1 which further includes a chain deflector wheel rotatably mounted on said support concentrically of said pivot axis for deflecting a travelling chain therearound.
Claim 4
Dependent Claim
32 words
A chain drive as set forth in claim 2 which further includes a chain slideway situated upstream of said deflector wheel relative to the direction of travel of a chain passing therebetween.
Claim 5
Dependent Claim
22 words
A chain drive as set forth in claim 1 wherein said support is secured to the outer tube of said concentric tubes.
Claim 6
Dependent Claim
23 words
A chain drive as set forth in claim 1 wherein said support includes a pair of arms situated symmetrically of said central plane.
Claim 7
Dependent Claim
152 words
In combination with a chain drive including an endless chain having a pair of runs and means for driving said chain; means for absorbing tension in at least one of said runs, said means including a support pivotally mounted about a pivot axis transverse to said support, a toothed tensioning wheel rotatably mounted on said support and engaging said one run, and an elongated torsion spring element secured to said support about said pivot axis and extending longitudinally outwardly on both sides of the plane of said support parallel to said pivot axis, said spring element including a pair of concentric tubes and a plurality of elongated pads of resilient material between said tubes with said support secured to the outer tube of said concentric tubes, said tensioning wheel being disposed in a central plane perpendicular to said pivot axis with said plane passing through the center of said torsion spring element.
Claim 8
Dependent Claim
152 words
In combination with a chain drive including an endless chain having a pair of runs and means for driving said chain; means for absorbing tension in at least one of said runs, said means including a support pivotally mounted about a pivot axis transverse to said support, a toothed tensioning wheel rotatably mounted on said support and engaging said one run, and an elongated torsion spring element secured to said support about said pivot axis and extending longitudinally outwardly on both sides of the plane of said support parallel to said pivot axis, said spring element including a pair of concentric tubes and a plurality of elongated pads of resilient material between said tubes with said support secured to the outer tube of said concentric tubes, said tensioning wheel being disposed in a central plane perpendicular to said pivot axis with said plane passing through the center of said torsion spring element.
Claim 9
Dependent Claim
22 words
The combination as set forth in claim 6 wherein said spring element is pre-stressed to urge said wheel against said one run.
Claim 10
Dependent Claim
29 words
The combination as set forth in claim 7 wherein said means further includes an adjusting means for adjusting the amount of pre-stress of said wheel against said one run.
Claim 11
Dependent Claim
43 words
The combination as set forth in claim 6 wherein said spring element includes a pair of concentric tubes and a plurality of elongated pads of resilient material between said tubes and said support is secured to the outer tube of said concentric tubes.
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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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |