Patent ID: 7967401

Claim:
A systematic cabinet comprising: i) first and second boards each with two opposite lateral sides, wherein each of the first and second boards includes mortises defined at two ends of each of said two opposite lateral sides thereof, with each mortise extending in a mortise direction for a preset length; and ii) connecting pieces for inserting into said mortises when joining the first and second boards, wherein each of said connecting pieces includes: ii.a) a solid locking body of six congruent faces, with the locking body including first and second dovetail-grooves separately defined on one of said six congruent faces without transversally grooving, with a central block section maintained between each of the first and second dovetail grooves and another of said six congruent faces; and ii.b) first and second tenon tubes engaged with the locking body, wherein each tenon tube has four lateral faces slideably received in the mortise direction in mortises of the first and second boards, with the first and second dovetail grooves extending perpendicular to the mortise direction and to the central block section, with the locking body having solid cross sections perpendicular to the first and second dovetail-grooves.