Coal Industry (Patents) Limited

Rock Mechanics Technology Limited

Alan Stuart Bloor

Paul Alan Fletcher

A strata movement indicator suspended within a borehole is provided with a drive element and a reference element relative movement between the elements being translated into rotary motion to give a visual indication on an indicator on the respective elements.

Strata movement indicators

A strata movement indicator includes at least two lengths of suspension wire respectively for remote and near anchors locatable in the same borehole. Each wire carries a cylinder provided with indicator markings, the cylinders being moveable with respect to one another and to a reference tube fixed in the mouth of the borehole. Relative movement of the cylinders with respect to one another and/or to the reference tube indicates the degree of strata movement.

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Stafford, United Kingdom

Alan Stuart Bloor