Patent ID: 8164473
Filing Date: 2012-04-24
Classification: G08B

Abstract:
1. A mine roof monitoring apparatus, comprising; a first contact member and a second contact member operatively associated with each other and resiliently biased in an expansive manner; and a motion monitoring apparatus attachable to either said first contact member or said second contact member, said motion monitoring apparatus comprising; wherein, said first contact member is maintained in contact with a mine roof and said second contact member is maintained in contact with a mine floor by being resiliently biased away from each other, and; said attaching member attaches said motion monitoring apparatus to either said first contact member or said second contact member with said latch release in proximity to the complimentary contact member, and wherein, when said mine roof subsides a predetermined amount, said first contact member moves said predetermined amount with respect to said second contact member, causing said latch release to unlatch said flag from said first position.