US3729089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device in belt conveyors
Assignee: Individual
•
Filing: 1971-04-06
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Granted: 1973-04-24
•
Expires: 1991-04-06
Abstract
Abstract A device in belt conveyors intended to increase the friction between a conveyor belt and the traction roll about which the belt is entrained. Over the conveyor belt there is fitted a pressure chamber, which is open in the direction facing the belt and which presses the belt against the roll.
Inventors
- 👤 I Kerttula
- 👤 P Jaatinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:24
CPC Classifications
B; B65; B65G; B65G23/00; B65G2812/00; B65G2812/02; B65G2812/02128; B65G2812/02138; B65G2812/02148; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1741
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
In a device for increasing the friction between the conveyor belt of a belt conveyor and a traction roll about which said conveyor belt is entrained, the improvement comprising; a pressure chamber having an open surface facing said belt in the region of said belt contacting said traction roll, said pressure chamber being adapted to impart a pressure to the surface of said belt so as to increase the friction between the latter and said roll, and a second pressure chamber positioned on the diametrically opposed side of said traction roll, said chamber having an open surface facing the roll and adapted to impart a pressure thereto in opposition to the pressure of said first pressure chamber.
Claim 2
Dependent Claim
117 words
In a device for increasing the friction between the conveyor belt of a belt conveyor and a traction roll about which said conveyor belt is entrained, the improvement comprising; a pressure chamber having an open surface facing said belt in the region of said belt contacting said traction roll, said pressure chamber being adapted to impart a pressure to the surface of said belt so as to increase the friction between the latter and said roll, and a second pressure chamber positioned on the diametrically opposed side of said traction roll, said chamber having an open surface facing the roll and adapted to impart a pressure thereto in opposition to the pressure of said first pressure chamber.
References Cited (Backward Citations)
GB829876A
Cited
US3446139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |