Mine roof support

Details Mine roof support Mine roof support

1974-10-11

1976-04-27

Shapiro, Jacob

E21D 1552

Patent

active

039525252

ABSTRACT:
A mine roof support arranged for propulsion over a mine floor by means of an advancing jack wherein the advancing jack is arranged to exert an inclined force on the support of which one component is parallel to the floor for propelling the support along the floor and the other component lifts or tends to lift the support from the floor thereby reducing frictional engagement with the floor.

REFERENCES:
patent: 3084920 (1963-04-01), Barrett

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