Gage for measuring displacements in rock samples

Patent · Wed Jan 01 04:00:00 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 CORP
• 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

/33/
adjustable
axis
change
communicated
completely
comprises
contact
core
defines
defining
diametral
diametrically
diametrically opposed
differential
differential transformer
dimple
directly
displacement
displacements
field
fixed
forces
formed
free
gage
housing
improved
inner
intermediate
intermediate portion
inward
laboratory
lateral
leaf
leaf spring
length
line
linear
linear variable
load
lvdt
measurement
measuring
measuring displacements
mechanics
mounted
mounting
mounting screw
opposed
opposite
parallel
periphery
portion
precision
projecting
projecting radially
radially
radially inward
received
rigid
rock
rock sample
rod
rod received
sample
samples
screw
spring
support
transformer
variable
variable differential