TELESCOPIC LOCK OF MECHANICAL ANCHOR Russian patent published in 2015 - IPC E21B33/12 

FIELD: mining.

SUBSTANCE: telescoping lock of mechanical anchor comprises a closed labyrinth groove formed in the barrel, and a floating pin mounted in a holder of the anchor, with the possibility of straight-line and circular movements within the labyrinth groove. The labyrinth groove comprises the long and short longitudinal channels and the transverse channels connecting them, and the protrusion with the parallelogram contour, the long sides of which form the long and short longitudinal channels. The transverse channels are made inclined to the axis of the barrel with the possibility of the transition of the floating pin from one longitudinal channel to another under the influence of the reactive force from the lateral sides of the inclined channels, caused by the force of inertia of the barrel on the floating pin. The transverse inclined channel of the floating pin displacement from the short longitudinal channel into the long is made with the inserting of the floating pin into its pocket of the support position, located on the midline of the protrusion. The transverse inclined channel of the floating pin displacement from the long longitudinal channel into the short longitudinal channel is formed by the cut of the sharp angle of the parallelogram parallel to the lateral side of the labyrinth groove. On the barrel parallel to the longitudinal channels a blind longitudinal groove is additionally formed with the length greater than the longitudinal length of the dimension of the labyrinth groove, in which the locking pin is located, eliminating the rotation of the barrel relative to the holder of the anchor assembly and the rest of the floating pin to the lower limit of the contour of the labyrinth groove.

EFFECT: increase in reliability of placement of the downhole devices.

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