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Ratchet Jack
A pump-type extension post made of steel that can support massive
amounts of weight, used as a temporary roof support and in the
placement of the wooden roof support.
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Roof Support
Wooden posts, jacks, roof bolts and beams are used to support
the rock overlying a coal seem in an underground mine. A good
roof support plan is part of mine safety and coal extraction.
These supports are built around the mine tunnels just after
they are dug. |
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Hydraulic Jacks (chocks)
Hydraulic jacks or chocks are modern jacks used to replace the
conventional roof support in preventing a collapse in the mine
tunnel. Hydraulic jacks lift through the force transmitted to
the moveable part of the jack by a liquid.
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