| 摘要 |
A coupling comprises an inner member 1 having an outer convex spherical periphery S1 centred about a central point C. The inner member has a torsional axis A1 extending through the central point. An outer ring 2 has an inner concave spherical periphery complementary to the outer periphery of the inner member. One of the inner member 1 and outer ring 2 has an elongate projection M1 projecting parallel to a line extending radially of the central point into a corresponding elongate slot K1 in the other. The slot and projection are elongate in a plane parallel the torsional axis A1. The projection and slot act to transmit torque about the torsional axis A1 from one to the other. The inner member and outer ring are rotatable one relative to the other about the said central point in a direction constrained by the projection and slot. The coupling may have additional members (3, 4 & 5, fig 9) and a coupling arrangement (66, 68, figs 6 & 8) may connect two couplings. |
