Appeal No. 2002-1265 Page 3
Application No. 09/558,575
Claim 30, the only independent claim on appeal, reads as follows:
A rotary cutting tool for generating slots in die boards comprising:
a first cutting portion defining a first outer diameter and a second cutting
portion defining a second outer diameter extending from and coaxial with said
first cutting portion;
said second cutting portion defining a generally cylindrical, outer
peripheral surface; and
wherein each of said first and second cutting portions are defined in part
by at least two helical cutting flutes extending longitudinally.
Arnold discloses a reamer for making a tapered hole. As shown in the
embodiment of Figure 1, the reamer comprises a cylindrical forward portion 12 joined to
the first end 16 of a conical rear portion 18. The rear portion 18 tapers outwardly from
its first end 16 to a second end 22 with the taper angle being equal to the required taper
of the hole to be reamed. The forward and rear portions have co-incident longitudinal
axes 20 and 21 and four cutting flutes 23, 24, 25 and 26 extending continuously on the
forward and rear portions and which are unequally spaced about the longitudinal axes.
The flutes are helical about the longitudinal axes and are misindexed about the axes
and therefore are unequally spaced apart. Arnold teaches (column 2, line 67, to column
3, line 17) that
[t]he forward portion 12 is normally used only as a guide to center the rear
portion 18 with the hole to be reamed, and also provides support for the cutting
edges as torque is applied but, as can be seen, the flutes 23-26 are extended
onto the forward guide portion 12 to its second end 27. This is done, because,
such reamers are usually machined or ground, and being able to begin the metal
removal from the second end 27 greatly facilitates reamer manufacture. The
portion of the flutes 23-26 extending over the forward guide portion 12 are
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007