Compression stress sensor

Details Compression stress sensor Compression stress sensor

1999-08-16

2001-11-20

Fuller, Benjamin R. (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

C073S855000, C073S790000

Reexamination Certificate

active

06318185

ABSTRACT:

The present invention is aimed at a compression stress sensor of the type including a proof body which is subjected to compression stresses along its longitudinal axis of symmetry; strain gauges being affixed to the surfaces of this proof body and connected together electrically to produce an output signal proportional to the compression of the proof body. The main objectives which the present invention proposes to achieve are:
1. To provide a sensor of which the proof body is monolithic and made of a single piece, in order to ensure a good distribution of the strains in the different measure zones.
2. To provide a sensor of which the proof body can be obtained through a limited number of machining operations which are simple, from a single rod of material
3. To provide a sensor having a small number of strain gauges affixed to surfaces of the proof body which undergoes, under the effect of variable compression stresses, a deformation along the longitudinal axis of said proof body. By achieving theses three objectives, a compression stress sensor is obtained which is simple to manufacture, reliable and inexpensive.
The compression stress sensor according to the present invention includes a proof body with a longitudinal axis of symmetry and exhibiting at each one of its ends a bearing face. It is intended for being subjected to a compression stress applied on said bearing faces. This proof body has at least one surface on which are affixed strain gauges. This compression stress sensor is characterised by the features set forth in claim
1
.
The appended drawing illustrates schematically and by way of example several embodiments of the compression stress sensor according to the invention.
FIG. 1
is an elevation view of the proof body according to a first embodiment.
FIG. 2
is a cross-sectional view of the proof body illustrated in
FIG. 1
, taken along line I-II.
FIG. 3
is an elevation view of the proof body illustrated in
FIGS. 1 and 2
, in the direction of the arrow A of FIG.
2
.
FIG. 4
is an elevation view of a second embodiment of a proof body.
FIG. 5
is a cross-sectional view taken along line V—V of FIG.
4
.
FIG. 6
is an elevation view of the proof body illustrated in
FIGS. 4 and 5
, in the direction of arrow B of FIG.
5
.
FIG. 7
is an elevation view of a third embodiment of the proof body.
FIG. 8
is a cross-sectional view taken along line VIII—VIII of FIG.
7
.
FIG. 9
is an elevation view, in the direction of arrow C of FIG.
8
.
FIGS. 10 and 11
are elevation views of two other embodiments of the proof body.
FIG. 12
is an elevation view of a proof body having a square cross-section.
FIG. 13
is a cross-sectional view taken along line XIII—XIII of FIG.
12
.
FIG. 14
is an elevation view of a cylindrical proof body.
FIG. 15
is a cross-sectional view of the proof body of
FIG. 14
, taken along line XV—XV.
FIG. 16
is an elevation view of a tubular proof body.
FIG. 17
is a cross-sectional view taken along line XVII—XVII of FIG.
16
.
FIG. 18
illustrates, partly in cross-section, a sensor housed in a sealed housing and wherein the ends of the proof body are in contact with load plates.
FIG. 19
illustrates, partly in cross-section, another method of mounting the sensor between load plates.


REFERENCES:
patent: 4522066 (1985-06-01), Kistler et al.
patent: 4647038 (1987-03-01), Noffsinger
patent: 5065631 (1991-11-01), Ashpitel et al.
patent: 5648617 (1997-07-01), Cullen et al.

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