| 摘要 |
A ball joint includes one member having a socket portion which has an internal support surface bounding a cavity, and another member having a mounting portion which is received in the cavity, and has a spherical contact surface that contacts the support surface, and thus mounts the two members for relative pivotal movement about at least two axes. The movement about one of the axes is made easier than about the other axis by providing the support surface with at least one zone which has a center located on the one axis, and which so engages the contact surface as to oppose the relative movement of the members with a higher frictional force per unit area, than the remainder of the support surface. |
