ELEVATOR CARTRIDGE Russian patent published in 2006 - IPC E21B19/06 

FIELD: handling rods, casings, tubes or the like outside the borehole, particularly means to transmit rotation movement to drilling string and to perform trips for drilling rigs provided with floating spindle.

SUBSTANCE: elevator cartridge comprises driving and driven links connected one to another by swivel so that the links may mutually rotate about vertical and horizontal axes. Elevator cartridge also comprises clutch, which prevents mutual link rotation in switched-on position. Driving link is made as the first shaft having non-round section and provided with axial orifice. Driven link is made as the second shaft having cross-section similar to that of the first shaft. Swivel is formed as round rod arranged in leading link orifice and provided with ear at lower end thereof. The ear is aligned with fork formed at upper end of driven link by means of transversal axis. The clutch is made as case movable along driving and driven links and surrounding them in lower position.

EFFECT: increased service life due to reduced wear thereof and simplified structure.

7 cl, 10 dwg