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US 2012/0027529 A1Published application
Mine Support Having a Linearly Moveable and/or Pivoting End Plate
AssigneeFCI Holdings Delaware, Inc.
InventorsWallace Bolton, Demrey G. Brandon, Ben Mirabile, John G. Oldsen, John C. Stankus, Rodney Poland
Life of this patent
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Abstract
A mine support yieldable prop includes a threaded shaft rotatably mounted in an end of the prop to move into and out of the prop end to move a bearing plate toward or away from a mine roof, and/or a bearing plate pivotally mounted to the end of the prop to level the prop with uneven mine roofs.
Claims11
A yieldable prop comprising:
- a) at least one conduit having a first end and an opposite second end, and
- b) a moveable bearing plate assembly mounted on the first end of the at least one conduit, the moveable bearing plate comprising:
- 1) a support member having a convex surface, a concave opposite surface and a center hole;
- 2) a plate member having a bowl-shaped center portion with the convex surface of the plate member supported on the concave surface of the support member, and with the bowl-shaped center portion having a center hole, and
- 3) a shaft having a retaining end, the shaft the receiving end passing through the center hole of the support member and the plate member with headed first end of the headed shaft engaging portions of the concave surface of the bowl-shaped center portion of the plate member and with the opposite second end of the shaft fixed to the first end of the at least one prop, wherein the center portion of the plate member is captured in the concave surface of the support member and is free to rotate in the X, Y and Z axis.
2 more elements
Dependencies are inferred from the claim text.