| 摘要 |
<p>Partial thread is made of hot rolled ribs set on a helical line, and an anchoring and connecting unit with counter thread. The ribs (12), fitted on opposite sides of the rod and mutually offset on opposite peripheral sides, run an a plane set vertically to the rod's longitudinal axis in each case. The anchoring or connecting unit is made of material with a different degree of rigidity from that in the rod. It may be either more or less rigid. Secure locking of the anchorage or connection is attained by simplified means.</p> |
