SEGMENTED FOLDING BALL SOCKET PROVIDING EXTRACTION OF BALL Russian patent published in 2016 - IPC E21B34/10 

FIELD: games.

SUBSTANCE: selectively actuated barrier to the tubular column on the subterranean site comprises a plurality of segments installed on the perimeter, which rest on the casing, and which are made with the ability to move from the first position where the segments enter into the tubular column, to the second position where the segments are drawn to increase the channel formed by the segments in the casing in the first position. The segments are spaced from each other outside the channel in the second position. There is a tapering element mounted in the casing adjacent to the segments and having a tapering opening larger than the channel when the segments are in the first position; and an object for descending on the segment, the locking channel when the segment is in the first position, and extending through the channel when the segment is drawn into the second position.

EFFECT: prevention of deformation of the ball socket opening, thereby preventing the ball hanging.

18 cl, 6 dwg