IMPACT SCREWDRIVER Russian patent published in 1997 - IPC

FIELD: tools. SUBSTANCE: placed in longitudinal keyways 10 of body 1 and in keyways 9 of nut 3 are two sunk keys 11 which prevent rotation of the nut. Lateral keyways of body 1 and annular keyways of screw 2 accommodate two Woodruff keys 5. Two half-rings 6 intended for retaining keys 5 are positioned between housing 1 and casing 7, which encloses the body. When impact load is applied to striker 14, nut 3 moves along the screwdriver axis thus making screw 2 together with working member 16 rotate. Nut 3 returns into initial position under action of spring 8. EFFECT: improved efficiency. 3 dwg