Patent DE676606C successfully refreshed from Google Patents.
US4539765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trench backfill device
Assignee: BP PLC
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Filing: 1984-01-13
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Granted: 1985-09-10
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Expires: 2004-01-13
Abstract
Abstract A device for backfilling a trench from spoil left alongside it comprises a forecarriage (7) and a main frame (10). The former comprises means (12) for positioning it centrally in the trench (3). The latter is located behind the former and carries one or more angled blades (9) and lateral stabilizers (18,19) adapted to contact the ground outside the spoil. The device is towed rather than pushed and if a long tow-rope is used a pipeline can be trenched and the trench backfilled in a single traverse.
Inventors
- 👤 Alan R. Reece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:04
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/22; E02F5/223; E02F5/02; E02F5/10; E02F5/102; E02F5/104; E02F5/106
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A device for back-filling a trench with spoil, the device comprising a forecarriage having pivotally mounted skids adapted to fit into the trench in contact with the walls thereof to locate the forecarriage centrally in the trench and a main frame located behind the forecarriage and connected thereto by a pivot means, the forecarriage comprising one or more pairs of rollers mounted on said skids and adapted to engage with a pipeline laid in the trench and thereby guide the device, the main frame carrying one or more angled blades and lateral stabilisers adapted to contact the ground outside the soil, the said stabilisers being adapted to provide a force which in the event that the said main frame tries to move to an angle to the line of the trench, will tend to restore the main frame so that it travels in the direction of the line of the trench.
Claim 2
Independent Claim
151 words
A device for back-filling a trench with spoil, the device comprising a forecarriage having pivotally mounted skids adapted to fit into the trench in contact with the walls thereof to locate the forecarriage centrally in the trench and a main frame located behind the forecarriage and connected thereto by a pivot means, the forecarriage comprising one or more pairs of rollers mounted on said skids and adapted to engage with a pipeline laid in the trench and thereby guide the device, the main frame carrying one or more angled blades and lateral stabilisers adapted to contact the ground outside the soil, the said stabilisers being adapted to provide a force which in the event that the said main frame tries to move to an angle to the line of the trench, will tend to restore the main frame so that it travels in the direction of the line of the trench.
Claim 3
Dependent Claim
19 words
A device according to claim 1 wherein each lateral stabilizer is a skid fitted with a downwardly projecting fin.
Claim 4
Dependent Claim
19 words
A device according to claim 1 wherein the main frame carries two symmetrically mounted angled blades and lateral stabilisers.
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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) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |