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Title: Gage for measuring displacements in rock samples

Abstract

A gage for measuring diametral displacement within a rock sample for use in a rock mechanics laboratory and in the field, comprises a support ring housing a linear variable differential transformer, a mounting screw, and a leaf spring. The mounting screw is adjustable and defines a first point of contact with the rock sample. The leaf spring has opposite ends fixed to the inner periphery of the mounting ring. An intermediate portion of the leaf spring projecting radially inward from the ring is formed with a dimple defining a second point of contact with the sample. The first and second points of contact are diametrically opposed to each other. The LVDT is mounted in the ring with its axis parallel to the line of measurement and its core rod received in the dimple of the leaf spring. Any change in the length of the line between the first and second support points is directly communicated to the LVDT. The leaf spring is rigid to completely support lateral forces so that the LVDT is free of all load for improved precision.

Inventors:
 [1];  [1]
  1. Albuquerque, NM
Issue Date:
Research Org.:
AT&T
OSTI Identifier:
865845
Patent Number(s):
4587739
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
gage; measuring; displacements; rock; samples; diametral; displacement; sample; mechanics; laboratory; field; comprises; support; housing; linear; variable; differential; transformer; mounting; screw; leaf; spring; adjustable; defines; contact; opposite; fixed; inner; periphery; intermediate; portion; projecting; radially; inward; formed; dimple; defining; diametrically; opposed; lvdt; mounted; axis; parallel; line; measurement; core; rod; received; change; length; directly; communicated; rigid; completely; lateral; forces; free; load; improved; precision; leaf spring; mounting screw; diametrically opposed; intermediate portion; radially inward; differential transformer; variable differential; linear variable; measuring displacements; rock sample; rod received; projecting radially; /33/

Citation Formats

Holcomb, David J, and McNamee, Michael J. Gage for measuring displacements in rock samples. United States: N. p., 1986. Web.
Holcomb, David J, & McNamee, Michael J. Gage for measuring displacements in rock samples. United States.
Holcomb, David J, and McNamee, Michael J. Wed . "Gage for measuring displacements in rock samples". United States. https://www.osti.gov/servlets/purl/865845.
@article{osti_865845,
title = {Gage for measuring displacements in rock samples},
author = {Holcomb, David J and McNamee, Michael J},
abstractNote = {A gage for measuring diametral displacement within a rock sample for use in a rock mechanics laboratory and in the field, comprises a support ring housing a linear variable differential transformer, a mounting screw, and a leaf spring. The mounting screw is adjustable and defines a first point of contact with the rock sample. The leaf spring has opposite ends fixed to the inner periphery of the mounting ring. An intermediate portion of the leaf spring projecting radially inward from the ring is formed with a dimple defining a second point of contact with the sample. The first and second points of contact are diametrically opposed to each other. The LVDT is mounted in the ring with its axis parallel to the line of measurement and its core rod received in the dimple of the leaf spring. Any change in the length of the line between the first and second support points is directly communicated to the LVDT. The leaf spring is rigid to completely support lateral forces so that the LVDT is free of all load for improved precision.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Patent:

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