Strata movement indicator

A strata movement indicator suspended within a borehole 1 is provided with a drive element 6 and a reference element 12 relative movement between the elements being translated, through a helically profiled shaft 28 in relation to slots 38 formed in collar 14 of element 12, into rotary motion to give...

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Bibliographic Details
Main Authors ALAN STUART BLOOR, PAUL ALAN FLETCHER
Format Patent
LanguageEnglish
Published 06.09.2000
Edition7
Subjects
EARTH DRILLING
FIXED CONSTRUCTIONS
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
MINING
PHYSICS
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS
TESTING
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Summary:A strata movement indicator suspended within a borehole 1 is provided with a drive element 6 and a reference element 12 relative movement between the elements being translated, through a helically profiled shaft 28 in relation to slots 38 formed in collar 14 of element 12, into rotary motion to give a visual indication on indicator means 10, 24 on the respective elements.
Bibliography:Application Number: GB19990004826