Temporary mine roof prop

Details Temporary mine roof prop Temporary mine roof prop

1978-08-30

1979-09-11

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

248356, 405289, E21D 1544

Patent

active

041673611

ABSTRACT:
The base member of a mine roof prop is provided with a closed lower chamber and an adjoining open-top upper chamber in which the lower end of a post is slidably mounted, with means at the upper end of the post for engaging a mine roof. A body of liquid is supported in the lower chamber by flexible means, below which there is an air inlet. The base member also has a liquid passage connecting the upper part of the lower chamber with the lower part of the upper chamber so that when compressed air is delivered to the air inlet, the flexible means will force liquid up through the passage and into the upper chamber to raise the post, whereupon a valve can be closed to trap the liquid in the upper chamber.

REFERENCES:
patent: 1752101 (1930-03-01), Meutsch
patent: 2695764 (1954-11-01), Grebe
patent: 2752757 (1956-07-01), Joy
patent: 2753036 (1956-07-01), Joy
patent: 2888231 (1959-05-01), Duncan

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