| 摘要 |
<p>In a rack extension jig device (9), a protracted direction (E) of tooth projections (12-14) and an elevational direction (H) of racks (7, 8) are placed in a coplanar position (G). This makes it possible to positively engage the tooth projections (12-14) with the respective rack teeth (7, 8) and half tooth surfaces (7c, 8c) so as to set a predetermined pitch interval (T) at a contact portion between the neighboring racks (7, 8) by only pushing the tooth projections (12, 13, 14) against roots (7d, 8d) of the respective rack teeth (7a, 8a) in perpendicular to the roots (7d, 8d), thereby making a rack adding work easy, quick and user-friendly.</p> |
