Patent US3708152A successfully refreshed from Google Patents.
US3708152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dragline fairlead
Assignee: Caterpillar Global Mining LLC
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Filing: 1970-12-04
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Granted: 1973-01-02
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Expires: 1990-12-04
Abstract
Abstract The drag rope of a dragline excavator passes over a lower sheave and then under an upper sheave as it is payed out from a drum in the excavator housing. The two sheaves are oriented to deflect the drag rope downward a predetermined angle as it passes between them. This orientation insures that the rotation of both sheaves is controlled by frictional engagement with the drag rope during operation. Such continuous control of the sheaves prevents relative movement between the drag rope and sheaves that may result in increased wear and fatigue of the rope.
Inventors
- 👤 K Bulin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:16
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/46; E02F3/48; B; B66; B66D; B66D1/00; B66D1/28; B66D1/36; B66D2700/00; B66D2700/01; B66D2700/0183; B66D2700/0191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
230 words
In a fairlead assembly for a drag-line excavator having a house with the fairlead assembly at the front thereof; a boom extending upward from the house; a hoist rope extending from the house to the top of the boom and then downward therefrom; a drag bucket attached to the hoist rope; a drag rope drum in the house; a drag rope traveling in a run from the drum to the fairlead assembly at the front of the house, and hence passing through the fairlead assembly to the bucket, the improvement in the fairlead assembly of: a lower rope engaging sheave rotatable about a first horizontal axis over which the drag rope passes in its run from the drag rope drum to the fairlead assembly and which continuously supports the undeRside of the drag rope; and an upper rope engaging sheave lying in a plane with the lower sheave rotatable about a second horizontal axis that is both forward of and above said first horizontal axis, the bottom of the rope engaging surface of said upper sheave being below the line taken by said run of the drag rope from the drag rope drum to the fairlead assembly, said upper sheave thus bearing against the top of said drag rope to deflect it during payout downward around the lower sheave from the horizontal at an angle of from 10* to 40*.
Claim 2
Dependent Claim
230 words
In a fairlead assembly for a drag-line excavator having a house with the fairlead assembly at the front thereof; a boom extending upward from the house; a hoist rope extending from the house to the top of the boom and then downward therefrom; a drag bucket attached to the hoist rope; a drag rope drum in the house; a drag rope traveling in a run from the drum to the fairlead assembly at the front of the house, and hence passing through the fairlead assembly to the bucket, the improvement in the fairlead assembly of: a lower rope engaging sheave rotatable about a first horizontal axis over which the drag rope passes in its run from the drag rope drum to the fairlead assembly and which continuously supports the undeRside of the drag rope; and an upper rope engaging sheave lying in a plane with the lower sheave rotatable about a second horizontal axis that is both forward of and above said first horizontal axis, the bottom of the rope engaging surface of said upper sheave being below the line taken by said run of the drag rope from the drag rope drum to the fairlead assembly, said upper sheave thus bearing against the top of said drag rope to deflect it during payout downward around the lower sheave from the horizontal at an angle of from 10* to 40*.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |