Patent ID: 6132129
Filing Date: 2000-10-17
Classification: A47B,F16B,Y10T

Abstract:
A tetrahedral joint comprisingthree flat pieces having equal thicknesses each defined by a flat surface, said three flat pieces each having a straight edge extending along an axis, said straight edge being perpendicular to said flat surface,each of said three flat pieces respectively having an open-ended slot cut along an axis into said straight edge through said flat surface, said open-ended slots forming miter angles of less than 90.degree. respectively with respect to said edge of each of said three flat pieces,each of said open-ended slots having uniform widths generally equal to said thickness of said three flat pieces,said open-ended slots being cut through said flat pieces at tilt angles in the range of 90.degree. or less with respect to said flat face,each of said three flat pieces being inserted across the width of the open-ended slot of another one of said three flat pieces and into the slot of the third piece to interconnect said three flat pieces to form a joint, said axis of each of said three open-ended slots intersecting each other at a common point when each three pieces are assembled; andsaid miter angle and said tilt angle of said open-ended slot of said third piece establishing the direction of said plane of said flat surface of each said flat piece being inserted.