Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Reexamination Certificate
2007-08-28
2007-08-28
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
C073S826000, C073S856000, C073S859000
Reexamination Certificate
active
11085032
ABSTRACT:
Apparatuses and methods for structurally testing fasteners are described herein. A fastener test apparatus configured in accordance with one aspect of the invention includes a first support member configured to support a head portion of a fastener, and a second support member configured to support a locking feature on a shaft portion of the fastener. The test apparatus can also include a force measurement device configured to be operably sandwiched between the first support member and the second support member. The force measurement device can be used to measure fastener preload. The test apparatus can further include first and second fixtures for performing an ultimate tensile test of the fastener. In this regard, the first fixture can be configured to exert a first force against the first support member in a first direction, and the second fixture can be configured to exert a second force against the second support member in a second direction opposite the first direction.
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Lowe Thomas J.
Madden Stella B.
Woods Mark A.
Lefkowitz Edward
Patel Punam
Perkins Coie LLP
The Boeing Company
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