Interlocking building block

An interlocking block construction, comprising:

• (a) a solid wide building block having a flat front face and a parallel flat matching aligned rear face extending parallel to and spaced from the front face,
• (b) two identical rectangularly-shaped upwardly-extending upper flat faces extending rearwardly and perpendicular from the front face along each top edge,
• (c) the upper flat faces being angularly inclined toward each other and meeting along the line of intersection which forms an upper central peak extending rearwardly and perpendicular to the front face,
• (d) each upper flat side face having a matching solid laterally thick block interlocking element approximately one-third the width of the block extending upwardly therefrom which is centrally located on the upper side face and accurately spaced from the front and rear faces as well as the upper peak of the block to provide solid lateral strength,
• (e) each block interlocking element including two flat upwardly-facing inwardly inclined side pilot surfaces of the same width and length which extend parallel to the front face and are angularly inclined toward each other so as to provide centering and guide action,
• (f) the block interlocking element having a flat top support face extending between the inclined pilot surfaces and parallel to the upper flat side face,
• (g) the block interlocking element also including an upwardly facing stop face connecting the two separately engaging pilot surfaces and inclined at a slightly greater angle than 90.degree. to the upper peak whereby a complementary surface of an adjacent block can be accurately guided into position and supported on the upper flat face,
• (h) the vertically disposed front face has two equally downwardly inclined lower edges which meet at a central lower apex in direct vertical alignment with the upper apex,
• (i) a flat lower side face extending rearwardly and perpendicular from the front face at each lower edge and angularly inclined toward each other meeting along a lower line of intersection extending rearwardly and perpendicular to the front face,
• (j) each flat lower side face having a centrally disposed receiving cavity which complements the block interlocking element on the opposite side of the upper peak and identically spaced from the plain of the adjacent upper side face, and,
• (k) the lower extending flat surface of each cavity being sufficiently spaced and inclined to permit vertical implacement of the block without contacting the lower most surface of the interlocking element on a lower course when the blocks are vertically assembled.