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US 9,995,140 B2Granted
Yieldable prop with yieldable insert
AssigneeFCI Holdings Delaware, Inc.
InventorsDakota Faulkner, Thomas Cook, John G. Oldsen, John C. Stankus
Life of this patent
Estimating the term…
Abstract
A mine prop includes a first pipe having a first end and a second end, a second pipe having a first end and a second end, and a yield member secured to the second pipe. The second pipe is slidably received in the first pipe. The yield member is configured to yield before the first and second pipes when the mine prop is placed under a predetermined load.
Claims24
A mine prop comprising:
- a first pipe having a first end and a second end;
- a second pipe having a first end and a second end, the second pipe slidably received in the first pipe;
- a yield member secured directly to the second pipe such that the yield member moves with the second pipe, the yield member configured to plastically deform before the first and second pipes when the mine prop is placed under a predetermined load.
A method of supporting a mine roof comprising:
- positioning a mine prop within a mine opening, the mine prop comprising a first pipe having first and second ends, a second pipe having first and second ends, and a yield member secured directly to the second pipe such that the yield member moves in a same direction as the second pipe, the second pipe received in the first pipe;
- extending the second pipe towards a roof of the mine opening;
- and
- plastically deforming the yield member when the mine prop receives a predetermined load from the roof of the mine opening.
1 more element
A mine prop comprising:
- a first pipe having a first end and a second end;
- a second pipe having a first end and a second end, the second end of the second pipe slidably received in the first pipe such that the second end of the second pipe is surrounded by the first pipe;
- a centering pipe received within the first end of the second pipe;
- and
- a yield pipe having a first end and a second end, the yield pipe receiving the centering pipe, the second end of the yield pipe engaging the first end of the second pipe, the yield pipe configured to yield before the second pipe when the mine prop is placed under a predetermined load.
2 more elements
A mine prop comprising:
- a first pipe having a first end and a second end;
- a second pipe having a first end and a second end, the second pipe slidably received in the first pipe;
- a washer entirely received and friction fit within the second pipe and defining at least one passageway, the washer comprising a polymeric material;
- and
- particulate material positioned within the second pipe, the second pipe having a retracted position and an extended position relative to the first pipe, the particulate material is movable from the second pipe to the first pipe when the second pipe transitions from the retracted position to the extended position.
2 more elements
Dependencies are inferred from the claim text.