ADVANCING ASSEMBLY AND POWERED SHIELD SUPPORT HEREWITH
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United States of America Patent
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Issued Date -
Jul 19, 2012
app pub date -
Sep 27, 2010
filing date -
Sep 29, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
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.
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