| 摘要 |
<p>A pinion gear for a screw jack or like device is disclosed. The member includes a shank, a collar at one end of the shank, and side gear teeth formed on the shank collar. The other end of the shank has a tool-accommodating recess defined by a rectangular skirt. These pinion gears are produced by a cold-forming process including the steps of shearing a blank from a supply, preliminarily sizing the blank, preliminarily forming teeth on one end of the blank, finally forming the teeth and the collar on the blank end, back-extruding the recess skirt at the other blank end, and crimping the skirt to form the desired tool-accommodating rectangular cross-sectional shape.</p> |
