TWO-PART PULLEY ASSEMBLY
Original Publication Date: 1993-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
A pulley which is intended to revolve with the shaft to which it is secured consists of a main pulley having a central aperture intended to receive a wedge which is a snap fit in the aperture. As shown in Fig. 1 of the drawings, the wedge 2 is intended to be seated on a flat 4 or other feature defining an 'absolute home position' intermediate the ends of the shaft 6. The pulley 8 is slid along the shaft from a specific direction relative to the wedge. The aperture 9 embraces both the shaft and the wedge to prevent rotation of the pulley about the shaft. As can be seen from Fig. 2, that surface of the wedge 2 parallel with that resting on the flat 4 is undercut by a recess 10 to form an overlying cantilever arm 12 having an outer lip 14. At the fixed end of the cantilevered arm 12 is another lip 16. The material of which the wedge is made is suficiently resilient for the outer end of the arm 12 to be able to be flexed inwardly of the pulley aperture 9 as the pulley 8 is pushed into position. This inward flexure of arm 12 is facilitated by a camming surface 18 axially outward of lip 14. The respective surface of the aperture is provided with recesses to house the lips 14 and 16 in a close fit preventing any axial movement of the pulley along the shaft when the pulley has been pushed along the shaft enough for the cantilever arm to snap the lip 14 into its locking position in the recess 20 in the pulley.