| 摘要 |
A universal joint device includes a number of couplers. Each coupler has a spherical head and a frustum portion secured together for engaging with the frustum portion and the spherical head of the other couplers. A tube has a frustum portion formed on one end for engaging with the spherical head of the couplers and has an annular rib extended radially inward from the other end. A rod has a number of teeth for engaging with the annular rib so as to secure the rod to the tube. The rod has a spherical head formed on one end for engaging with the frustum portion of the couplers.
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