Drilling lessons for the arrangement and insertion of holes for the doubling of workpieces

摘要

drilling instruction (1) for the arrangement and insertion of holes for the doubling of workpieces, in particular of wood materials,with drill holes (2(a) arranged in a row (2), the drill holes (3) incorporated in a base body (2) being designed and intended to be drilled;and has grid bores (6) for inserting bolts (7),with impact bolts (7) for insertion into grid boreholes (6) of the drilling pipe (1), the impact bolts (7) showing a reception area (7a) intended for insertion in a grid bore (6) and showing a head area (7b) for the formation of an impact area,marked by it,that grid bores (6) are symmetrically aligned to the boreholes in row (2a) and that impact bolts (7) are formed with headings (7b) of different diameters.