ELECTROMAGNETIC IMPACT MECHANISM Russian patent published in 2013 - IPC E21B1/22 

FIELD: machine building.

SUBSTANCE: proposed mechanism comprises core pickup with magnetisation coil enclosed therein, hollow hammer, guide, return spring and tool shank. Note here that mentioned guide is made of nonmagnetic material and lock on one side to prevent axial displacement in mechanism body relative to core pickup. On opposite side, aforesaid guide is connected by a slide fit with tool shank having central bore in diameter equal to that of said guide that doubles as that of hollow hammer and with return spring fitted inside the hammer.

EFFECT: higher efficiency.

1 dwg