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US 5,507,331 AGranted
Drilling/cutting bit, and method of making joint
AssigneeNakanishi Construction Company
InventorTeruo Nakanishi
Life of this patent
Estimating the term…
Abstract
A drilling/cutting bit for forming joints in wooden members to be connected together by a coupling. The bit simultaneously forms a smaller width slot, a larger width slot, and a curved transition between the slots.
Claims6
A drilling/cutting bit for forming joints for connecting wooden members, said bit comprising:
- a shank;
- a body connected to said shank, said body having at least one groove with a main trailing cutting edge oriented Substantially parallel relative to a center longitudinal axis of the bit for cutting a smaller width groove and a curved trailing cutting edge for cutting a curved radially inwardly tapering transition groove;
- and
- an end cutting blade, said end cutting blade having a bottom cutting edge and a side cutting edge configured for cutting a rectangular groove adjacent a wider end of said curved radially inwardly tapering transition groove, said side cutting edge having a predetermined length and oriented substantially parallel relative to said main trailing cutting edge.
1 more element
A method of making a joint in wooden members so that the wooden members can be joined together by a coupling, comprising the steps of:
- cutting a smaller width groove at a predetermined depth from the surface of the wooden member;
- simultaneously cutting a larger width groove at a predetermined depth greater than said smaller width groove;
- and
- simultaneously cutting a curved transition groove between said smaller width groove and said larger width groove.
1 more element
Dependencies are inferred from the claim text.