Gage for measuring displacements in rock samples

Patent · Wed Jan 01 00:00:00 EST 1986

OSTI ID:865845

Holcomb, David J ^[1]; McNamee, Michael J ^[1]

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1. Albuquerque, NM

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.

• Research Organization: AT&T
• DOE Contract Number: AC04-76DP00789
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4587739
• OSTI ID: 865845
• Country of Publication: United States
• Language: English

Related Subjects

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/