Appeal No. 2005-0948 Page 19
Application No. 09/922,938
and carries a head shaft 18 rotatably supported in bearings 20 and 22. One end of the
shaft 18 extends outside of the housing formed by the bracket 16 towards the tailstock 12
and rigidly carries a work mounting means such as face plate 26, or any
conventional form of work-holding chuck. The other end of the shaft 18 projects
beyond the outer end of the housing and carries a handwheel 28 which is drivingly
connected thereto, for example by key 30 and set screw 32. The handwheel 28
comprises a hub 34 for mounting the wheel on shaft 18, a web 36, a hand ring 38 and an
axially extending drum 40. The headstock bracket 16 is formed with an outer end face
which includes a central boss 42, an annular concavity 44 surrounding the boss, and a
ring 46 which has a flat annular surface radially outwardly placed with respect
to the concavity 44, defining the outer limits thereof, and lying in a plane perpendicular to
the axis of shaft 18. Extending radially inwardly from ring 46 are a plurality of scale
mounting bosses 48, and rigidly attached to bosses 48 by fasteners 50 is a full circle,
accurately divided protractor scale 52 whose graduated periphery rests against the ring
46 on the headstock bracket for firm support.
Hardy's drum 40 constitutes one part of a clamping mechanism for holding the
shaft 18 in any desired angular position. The other part of the clamping mechanism is
shown in the drawing as being a brake element in the form of a radially extending screw
60 threadedly engaged in a tapped opening in one of the bosses 48 and provided with a
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Last modified: November 3, 2007