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AssigneeBucyrus Europe GmbH
InventorsFriedrich Wilhelm Dannehl, Holger Behnert, Werner Reinelt
Estimating the term…
An advancing assembly for underground powered shield support having at least one floor skid for supporting the powered shield support, an advancing beam and a substantially perpendicularly arranged lift cylinder for lifting the floor skid relative to the advancing beam during an advancing movement. The lift cylinder has a cylinder foot supported above the advancing beam and a cylinder head buttressed on a bridge and hydraulically displaceable relative to the cylinder foot. In order to improve a powered shield support and in particular the advancing assembly of a powered shield support, the lift cylinder is a double lift cylinder having a first cylinder stage, comprising the cylinder head, and a second cylinder stage, wherein a compression spring is arranged between the cylinder stages.
1-12. (canceled)
An advancing assembly for an underground powered shield support, comprising at least one floor skid for supporting the powered shield support, comprising an advancing beam for an advancing movement of the powered shield support and comprising a substantially perpendicularly arranged lift cylinder for lifting the floor skid relative to the advancing beam during an advancing movement, wherein the lift cylinder has a cylinder foot supported above the advancing beam and a cylinder head buttressed on a bridge and hydraulically displaceable relative to the cylinder foot, the lift cylinder includes a double lift cylinder having a first cylinder stage having the cylinder head, and a second cylinder stage, wherein a compression spring is arranged between the first and second cylinder stages.
A powered shield support comprising a shield canopy, comprising at least one floor skid, comprising hydraulic legs, with which the shield canopy is movable relative to the floor skid, comprising a guide bar mechanism and comprising an advancing assembly having an advancing beam for moving the powered shield support and a substantially perpendicularly arranged lift cylinder for lifting the floor skid relative to the advancing beam during an advancing movement, wherein the lift cylinder has a cylinder foot supported above the advancing beam and a cylinder head buttressed on a bridge and hydraulically displaceable relative to the cylinder foot, the lift cylinder includes a double lift cylinder having a first cylinder stage having the cylinder head, and a second cylinder stage, wherein a compression spring is arranged between the first and second cylinder stages.
Dependencies are inferred from the claim text.