US3770108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tensioning device for wide moving belts
Assignee: Mende Wilhelm and Co
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Filing: 1972-03-21
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Granted: 1973-11-06
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Expires: 1992-03-21
Abstract
Abstract A tensioning device for a steel conveyor belt running over a drum or pulley which insures uniform tension over the entire width of the belt to prevent cracking the belt due to concentrated stress. The device comprises hydraulic cylinders, one at either end of the drum axle to adjust tension by moving the drum, and a regulating cylinder acting on the axle in a direction perpendicular to the force of the tensioning cylinders which responds to lateral deflections of the belt and tilts the drum to cause the belt to return to its normal mean position. The tensioning cylinders are connected to a common fluid supply conduit of larger diameter than the conduit connecting to the source of fluid to insure equal pressure in both cylinders in any tilted position.
Inventors
- 👤 H Ettel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:19
CPC Classifications
B; B21; B21C; B21C47/00; B21C47/34; B21C47/3408; B21C47/3425
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
In a tensioning device for conveyor belts, said tensioning device including a tensioning roll, said conveyor belt passing over and having a mean path on said tensioning roll, a pair of hydraulic cylinders, said tensioning cylinders being connected to a pressure source by a supply conduit and acting upon said tensioning roll to adjust the tension exerted by said tensioning roll upon said conveyor belt, and a hydraulic regulating cylinder, said hydraulic regulating cylinder acting upon one end of said tensioning roll in a direction substantially perpendicular to the direction of action of said hydraulic tensioning cylinders, said hydraulic regulating cylinder being connected to a pressure source and pressurized as a function of the lateral deflection of said conveyor belt from said mean position, such that said tensioning roll is tilted causing said conveyor belt to return to said mean position, the improvement comprising an equalizing conduit connecting said hydraulic tensioning cylinders, said equalizing conduit equalizing the pressure in said hydraulic tensioning cylinders to provide a uniform tension across said conveyor belt.
Claim 2
Dependent Claim
172 words
In a tensioning device for conveyor belts, said tensioning device including a tensioning roll, said conveyor belt passing over and having a mean path on said tensioning roll, a pair of hydraulic cylinders, said tensioning cylinders being connected to a pressure source by a supply conduit and acting upon said tensioning roll to adjust the tension exerted by said tensioning roll upon said conveyor belt, and a hydraulic regulating cylinder, said hydraulic regulating cylinder acting upon one end of said tensioning roll in a direction substantially perpendicular to the direction of action of said hydraulic tensioning cylinders, said hydraulic regulating cylinder being connected to a pressure source and pressurized as a function of the lateral deflection of said conveyor belt from said mean position, such that said tensioning roll is tilted causing said conveyor belt to return to said mean position, the improvement comprising an equalizing conduit connecting said hydraulic tensioning cylinders, said equalizing conduit equalizing the pressure in said hydraulic tensioning cylinders to provide a uniform tension across said conveyor belt.
Claim 3
Dependent Claim
22 words
The improvement of claim 1 wherein the diameter of said equalizing conduit is substantially greater than the diameter of said supply conduit.
Claim 4
Dependent Claim
20 words
The improvement of claim 1 wherein said supply conduit is connected to said equalizing conduit between said hydraulic tensioning cylinders.
References Cited (Backward Citations)
DE1250228B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |