Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specimen clamp – holder – or support
Reexamination Certificate
1999-04-08
2001-07-31
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specimen clamp, holder, or support
C073S859000, C073S831000
Reexamination Certificate
active
06267012
ABSTRACT:
The present invention relates in general to the application of tensile load to specimens for structural testing thereof.
BACKGROUND OF THE INVENTION
Tensile specimens are subjected to dynamic testing at a high rate by attachment to and release from a testing machine through which an axial displacement is imposed on the specimen and diametrical displacement results, with both displacements being recorded. In the case of a notched cylindrical bar type of tensile specimen, cloverleaf shaped fixture grips are presently utilized for attachment to and removal of such specimens from the testing machine. Such fixture grips require complete assembly of parts during set up by means of four bolt fasteners and extensive fixturing by reason of which data recording errors are introduced during high rate dynamic testing operation because of fixture flexure. It is therefore an important object of the present invention to provide fixture grips for tensile specimen bars in dynamic test machine installations as aforementioned, which will decrease set up and removal time between tests to thereby increase the testing rate as well as to reduce flexure causing errors.
SUMMARY OF THE INVENTION
In accordance with the present invention, a hinge type of fixture grip is provided for removable attachment to each axial end of a notched bar type of tensile specimen within a dynamic test machine installation. Such grip is formed from three parts consisting of one base piece of uniform thickness in axial abutment on one planar side thereof with two interfitting hinge parts held assembled by a pair of bolt fasteners, one of which is completely removed while the other is partially loosened so as to act as a hinge pivot for pivotal displacement of the intermitted hinge parts during set up or removal of the fixture grip from the tensile specimen bar.
REFERENCES:
patent: 5297441 (1994-03-01), Smith et al.
patent: 5585570 (1996-12-01), Raymond
patent: 5798463 (1998-08-01), Doudican et al.
Fuller Benjamin R.
Shuster Jacob
Stevens Maurice
The United States of America as represented by the Secretary of
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