Patent ID: 7328535

Claim:
An assembly of interlocking tiers of stackable precast concrete building blocks, said blocks being of the type used to erect walls by stacking said blocks in vertical or setback configurations, said blocks being of the type having planar top and bottom surfaces having symmetrical apertures on their top and bottom surfaces, said blocks being connected by a connecter, said connector being shaped and sized to snugly fit in the apertures of said blocks so as to prevent sliding of blocks once interlocked by the connector, said connector having a first body portion defining a shape contour and being adapted for assembly in manually pivotable relationship with a second body portion having a shape contour similar to the first body portion, said pivotable relationship being established at a point offset from the geometrical center of the body portions whereby when assembled, the connector can be manually adjusted to provide a shape contour typical of a vertical interlocking mode and at least one offset shape contour typical of an offset interlocking mode; wherein the pivotable relationship is established by providing a generally cylindrical protrusion on the first body portion and providing on the second body portion a corresponding aperture, sized and shaped to receive said protrusion.