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Title: Head assembly for multiposition borehole extensometer

Abstract

A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence. A plurality of inflatable anchors provide discrete measurement points. A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod. The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight. A second sprocket wheel connected to the standpipe also engages the chain and drives a connected potentiometer. The head assembly converts the linear displacement of the metering rod to the rotary motion of the second sprocket wheel, which is measured by the potentiometer, producing a continuous electrical output.

Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
864546
Patent Number(s):
4382335
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
head; assembly; multiposition; borehole; extensometer; improved; measuring; subsurface; subsidence; plurality; inflatable; anchors; provide; discrete; measurement; metering; rod; fixed; displaced; occurs; translating; attached; sprocket; wheel; rotatably; mounted; standpipe; engaged; chain; connected; counterweight; engages; drives; potentiometer; converts; linear; displacement; rotary; motion; measured; producing; continuous; electrical; output; linear displacement; head assembly; rotatably mounted; rotary motion; electrical output; provide discrete; measuring subsurface; continuous electrical; surface subsidence; borehole extensometer; /33/

Citation Formats

Frank, Donald N. Head assembly for multiposition borehole extensometer. United States: N. p., 1983. Web.
Frank, Donald N. Head assembly for multiposition borehole extensometer. United States.
Frank, Donald N. Sat . "Head assembly for multiposition borehole extensometer". United States. https://www.osti.gov/servlets/purl/864546.
@article{osti_864546,
title = {Head assembly for multiposition borehole extensometer},
author = {Frank, Donald N.},
abstractNote = {A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence. A plurality of inflatable anchors provide discrete measurement points. A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod. The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight. A second sprocket wheel connected to the standpipe also engages the chain and drives a connected potentiometer. The head assembly converts the linear displacement of the metering rod to the rotary motion of the second sprocket wheel, which is measured by the potentiometer, producing a continuous electrical output.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {1}
}

Patent:

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