Appeal No. 2005-0948 Page 20
Application No. 09/922,938
knurled operating head 62 for manual operation. When it is desired to clamp the shaft 18
in any given position, the screw 60 is rotated so as to feed inwardly into contact with the
drum 40 and firmly engage the same. When it is desired to have the shaft rotate freely,
the screw 60 may be rotated by the head 62 to feed the same away from the drum 40 for
release of the handwheel and shaft. In order that the shaft 18 may be set at any desired
angular position and accurately maintained therein, Hardy teaches (column 3, lines 20-
33) that:
the outer surface of the drum 40 should remain smooth and free from irregularities
which might cause slight angular displacement during the tightening of the screw
60. To this end the outer surface of the drum 40 is preferably ground as smooth
as possible and hardened by any suitable process, while the screw 60 is made of
metal slightly softer than the surface of the drum and still capable of carrying the
required clamping loads on its threads. If necessary the tip of the screw 60 may
be made softer than the threads, or a special shoe for bearing on the drum 40 may
be attached to the tip of the screw 60 if desired. Likewise the movement of the
brake member or screw 60 should be truly radial to prevent any tendency to move
the drum during final tightening.
Lebermann's invention relates to an automatic work head and indexing device for
use on cutter and surface grinders. Figure 1 illustrates a grinder 10 having a drive 11, a
tail stock 12, a grinding wheel 13 and a tooth rest 14. The tail stock 12 is mounted upon
a reciprocating table 15 supported upon a base 15' and in horizontal alignment therewith
and likewise carried by the table is a combined work head and indexing device 16. As
shown in Figures 1, 2, 3, 5, 9 and 10, the combined work head and indexing device 16
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