Supports – Resilient support – Including spring zone understructure
Reexamination Certificate
2007-06-19
2007-06-19
Friedman, Carl (Department: 3632)
Supports
Resilient support
Including spring zone understructure
C248S354100, C248S200100, C248S636000, C248S562000, C405S288000, C405S289000, C052S002210
Reexamination Certificate
active
10976360
ABSTRACT:
A load-bearing, pressurized-fluid column apparatus and method for supporting a load or mine ceiling with respect to a support surface or mine floor includes an elongated, flexible sleeve and bladder retain a substantially incompressible liquid. The sleeve and bladder have a collapsed and an expanded configuration. In the collapsed configuration, the sleeve and bladder are not filled, and have a first, shorter length. In the expanded configuration, the sleeve and bladder are filled with the liquid, and have a second, longer length sized to extend to and between the load and the support surface. A valve allows the liquid to be added and prevents escape of the liquid. A base can seal a lower end of the sleeve, and can be disposed on the support surface. A cap can seal an upper end of the sleeve, and can be capable of abutting the load.
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Efficient Mining Systems LLC
Friedman Carl
McDuffie Michael D.
Thorpe North & Western
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