PERCUSSION DRILL Russian patent published in 2006 - IPC B23B45/16 B28D1/14 

FIELD: percussion drills for drilling openings in concrete, mortar, ceramic tiles.

SUBSTANCE: drill includes mainframe, motor, spindle, first ratchet mounted on spindle and having first toothed surface with alternating dents and indentations, second ratchet whose toothed surface is arranged opposite relative to that of first one, spring for shifting first ratchet towards second one. At axial shifting of spindle first ratchet adjoins to second ratchet. Relative rotation of ratchets causes alternating abutting of dents to indentations and dents to dents. Spring has rigidity sufficient for preventing contact of second ratchet and spindle with main frame when effort 15 - 25 kg is applied to main frame for drilling opening in article. In other variant of invention spindle moves in axial direction between extended and drawn aside positions. First ratchet rotates and moves together with spindle in axial direction. Second ratchet is arranged opposite relative to first one with possibility of axial motion but rotation around its own axis is prevented. Spring is arranged between second ratchet and main frame. When spindle is shifted first ratchet adjoins to second one and relative rotation of first and second ratchets causes reciprocation motion of spindle.

EFFECT: minimized vibration transmitted to handle at drilling process.

27 cl, 19 dwg