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Mine Safety and Health Administration MSHA's Accident Prevention Program
Miner's Tip

Roof Support Jacks

Safety Something YOU can live with!
Mine Type: Underground Coal
Category: Roof and Rib

It's a common task for miners to set jacks or dukes to support the roof. But there can be a hazard from a piece of rock falling when a miner releases the pressure and removes the jack.

A safety tip is to release and remove roof-support jacks remotely.

Jack the Tripper Jack the Tripper Jack the Tripper Jack the Tripper

A pull rope can be rigged to trip the jack from a safe distance. Then the same rope can be used to drag the jack out of the area.

Jack the Tripper
Reissued: 04/30/2002
Tag # AP2002-M028

If you have a tip you would like to pass on, you can e-mail it to If your Miner's tip is selected, you will receive credit in this space.