| 摘要 |
The mechanical joint includes a spherical member having a pair of grooves in its outer surface, each groove extending circumferentially about the spherical member and disposed approximately 90 DEG from each other. A housing has a concave spherical socket for receiving the spherical member. The housing includes a pair of slots located proximately at an equatorial plane of the spherical member. A frame is fixedly secured to the spherical member at the intersection of the first and second groove opposite the housing. A first ribbon, slidable within the first groove, is attached to pivot pins in the slots of the housing and is looped around a first pulley within the frame. A second ribbon slidable within the second groove is attached to pivot pins mounted in the housing at the approximate midpoints between the slots of the housing. The second ribbon is attached to a second pulley within the housing. An output member is fixedly connected to the housing. First and second drives provide selective movement of the first and second ribbons. |
