BORE-HOLE DISCONNECTING PIECE Russian patent published in 2012 - IPC E21B17/06 

FIELD: machine building.

SUBSTANCE: device includes upper and lower parts tightly inserted into each other and fixed by torque transfer assembly in the form of spline connection and axial load transfer assembly having internal taper surface, which is connected to upper part and arranged in transport position in annular bore of lower part, seat with ball seat and external taper surface for taper surface of axial load transfer assembly. Seat is fixed in transport position and has the possibility of restricted downward movement. In upper part there are radial holes for axial load transfer assembly that is made in the form of individual billets the internal taper surface of which has the possibility of the movement restricted with upper stop of the seat along external taper surface of the seat inserted into upper part. Annular extension is made inside upper part below radial holes. The seat above ball seat is provided with radial channels having the possibility of interaction with annular extension of upper part after downward movement of the seat, and inside - with annular projection for compression spring pressing the ball to its mounting seat in the seat.

EFFECT: simpler design and high reliability.

3 cl, 1 dwg