Appeal No. 1998-0331
Application No. 08/297,257
The examiner determined that Ledergerber teaches "a
hydraulic control system (Fig. 3) to rout pressure fluid from
the drive shaft hollow cavity to the spindle carrier (12)
interior manifold (23)" (answer, p. 9). The appellants argue
that Ledergerber contains no such teaching.
In Fig. 2, Ledergerber teaches a rotatable spindle
carrier 12 supporting a plurality of spindles 11. Each
spindle includes a front 13, 131 and rear 14, 141 "sliding
type bearing" (col. 3, l. 6). Ledergerber also teaches a
structure for preloading the rear bearing including a
prestressed spring 15 which biases the outer race 14 against
the inner race 141 and the inner race against the conical
surface 112 of the spindle. See id. at ll. 21-25. In order
to relieve or reduce the spring bias on the rear bearing,
Ledergerber provides a hydraulic control system in Figs. 3-5,
including a distributor
mounted behind the carrier 12, i.e., remote
from the chucks of the spindles 11, and
comprises a cylinder 25 movable with
reference to a distributor member of plunger
26. The cylinder 26 [sic, 25] is bolted to a
centrally located holder 27 which is affixed
to the indexing plate or wheel 28 for the
spindle carrier 12. Thus, the cylinder 25 is
rigid with and is coaxially mounted on the
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