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US 4,013,107 AGranted
Saw blade and fret-saw combination and method for use thereof
AssigneeMapatex Establishment
InventorsFerdinand Steiger, Werner Wahlen
Life of this patent
Estimating the term…
Abstract
A fret-saw blade in combination with a fret-saw for sawing out slits starting from small-diameter holes, the blade having two rectangular segments of varying width with each of these segments having teeth of the same depth and parallel toothed and untoothed sides, and a method for using said combination.
Claims6
A saw blade in combination with a fret-saw;
- said fret-saw having means for clamping said blade substantially at its ends, said saw blade consisting essentially of two connected longitudinal sections having parallel sides of differing widths with each of said sections being toothed at the same one of said sides, the toothings for each of said sections being of substantially the same depths, the fret-saw further including means for selecting the cutting portion of said blade so that only one of said sections is cutting at any particular moment.
A method for cutting a substantially flat workpiece in a precise pattern including
- a. drilling a hole of sufficient size to allow a saw blade of narrow width pass unrestrictedly through the hole;
- b. inserting a saw blade, consisting essentially of two longitudinal substantial sections of differing width, each of said sections having two parallel sides, with one of said sides of each of said sections being toothed and the toothings being of substantially the same depth, into said hole, said hole being of sufficient diameter to fully admit only the narrower blade section;
- c. initiating sawing with the narrower blade section until a cut is made of sufficient length to admit the wider section;
- and
- d. completing the cutting with said wider section.
2 more elements
Dependencies are inferred from the claim text.