Jack for installing mine stopping
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United States of America Patent
Stats
-
Aug 9, 2022
Grant Date -
Jul 1, 2021
app pub date -
Dec 31, 2019
filing date -
Dec 31, 2019
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A jack for installing a mine stopping panel includes an extendible post and a press for extending the extendible post. The press can have a lever movable between an actuated position and a non-actuated position and operative to extend the post as it moves toward the actuated position and retract the post as it moves toward the non-actuated position. A yieldable biaser yields when the post is extended to extend the mine stopping panel and the mine stopping panel engages a mine surface with sufficient force to crush a stopping seal and anchor the stopping panel. The press can comprise an over-center toggle linkage.
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