| 摘要 |
A cylindrical body 12, 13 has a first socket portion in the top 13, receiving a ball 11. A ball retainer 12 has a second socket portion facing the first socket portion and receiving the ball therein. A post 23 has a proximal end fixed to the ball and includes screw threads 235 at the distal end to receive a fastener thereon for attachment of an object. The ball-in-socket mounting enables swiveling the ball and the distal end of the post to an infinite number of loci in a spherical envelope. The body has a cylinder in the bottom receiving a piston 17. The piston is connected to the ball retainer for clamping the retainer on the ball and thereby locking the ball in the socket portions, to lock the post and thereby the object mounted to the post, in a position and orientation in space as selected by the user. |
