Appeal No. 96-3463
Application 08/514,835
The appellant's invention pertains a power jaw apparatus
for applying high torques to sections of threadedly connected
pipe. Of particular importance is the provision of a pair of
cooperating toothed pipe-gripping dies wherein one die is mounted
for rotation through a relatively large angle and the other die
is either (1) fixed or (2) mounted for rotation through a
relatively small angle. According to the appellant's
specification, this arrangement (1) achieves the advantages of
(a) providing "more stability" than the examiner's primary
reference to Hauk and (b) maximizes the extension of the power
cylinder (see the paragraph bridging pages 12 and 13). The
appellant's specification further states that the required
arrangement (2) provides the above-noted advantages (a) and (b)
and, in addition, provides the advantage of (c) "spreading" the
load over different teeth (see pages 13 and 14). Independent
claims 12 and 15 are further illustrative of the appealed subject
matter and copies thereof may be found in the appendix to the
appellant's brief.
The references relied on by the examiner are:
Wheeler 2,959,996 Nov. 15, 1960
Inoue 4,706,528 Nov. 17, 1987
Schulze-Beckinghausen 5,044,232 Sep. 3, 1991
Hauk 5,060,542 Oct. 29, 1991
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