Interference No. 103,414
grip thickness in accordance with Unistrut's
requirement. Mr. Vickers also advised the
results of Southco's tests which showed that
the driving force at the maximum grip, which
is through two tubes plus one fitting, was
approximately equal to the [driving force
required for the] previous samples through
the thinner grip, which is through one
fitting to single tube. At the top of the
page of Mr. Vickers' letter, the date is
incorrectly identified as 15 June 93 and
should instead read 15 June 92. (Vickers, ER
13:22-14:10).
13. Mr. O'Rourke subsequently received a
telephone call from Unistrut, which he
believes was from Mr. Wright, who expressed
dissatisfaction with the three-stage rivet
that he had received from Southco.
(O'Rourke, ER 3:8-10). Mr. O'Rourke
subsequently advised Mr. Vickers by telephone
that Unistrut was not satisfied with the
three-stage rivet. (Vickers, ER 14:11-14).
Mr. Vickers in turn thereafter relayed this
information to Mr. Ellis. (Ellis, ER 8:12-
16).
[The partially tapered rivet]
14. In September 1992, Mr. Ellis conceived
of an alternate design in which the three-
stage rivet was modified to substitute a
taper for the middle stage on the shank. The
partially tapered shank design provided a
grip range between .200" minimum to .460["]
maximum, corresponding to that of the three-
stage design. The primary differences in the
partially tapered shank design from the
three-stage shank design are seen at the
maximum grip of the Telestrut system, which
is through two tubes and one fitting. In
particular, when installing the rivets, the
partially tapered shank provides for easier
driving than the three-stage design, however,
the partially tapered shank also yields a
less tight joint than that provided by the
three-stage design. Samples of the partially
tapered shank design were made and sent to
Unistrut. (Ellis, ER 8:17-9:7).
App. 6
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