ELECTRIC DRILL WITH DRILLING ACCURACY ENHANCING DEVICE Russian patent published in 2006 - IPC B23B45/14 

FIELD: machine engineering, namely manual drilling apparatuses, possibly for drilling openings in metals, wood, plastics and other materials.

SUBSTANCE: electric drill includes housing, reduction gear, spindle, clamping chuck, drill, turn on button and mirror designed for placing onto worked surface. Electric drill also includes laser apparatus in the form of laser that may direct laser beam by inclination angle 1.5 - 2.5° relative to drill rotation axis; and dull glass mounted on housing of apparatus and having concentric circles. Mirror may be mounted on worked surface by inclination angle 0 - 90° relative to laser beam according to condition providing laser beam reflection onto dull glass. The last may be mounted by angle 90° relative to laser beam reflected from mirror. Laser may be moved on housing of electric drill along rotation axis of drill.

EFFECT: improved accuracy of drilling by preset angles regardless of inclination angle of worked surface and illumination degree.

2 cl, 3 dwg