Earl D Anderson

US Patent:

42493552, Feb 10, 1981

Filed:

Apr 12, 1977

Appl. No.:

5/786761

Inventors:

Earl R. Anderson - Bellevue WA
Lee E. Johnson - Mercer Island WA

International Classification:

E04C 110
E04C 330

US Classification:

52593

Abstract:

A modified dovetail joint interconnects a plywood web to a chord. The chord carries two grooves extending inwardly from the surface of the chord intersected by the web. The two grooves merge into a single, wider groove adjacent the surface of the chord, are separated by a wedge-shaped spacer, and are inclined relative to each other. The plywood web carries two flexible tongues along its edge portion that are sized to engage respective ones of the grooves in the chord. The tongues are composed, at least in part, of two of the veneer layers of the plywood and are spaced from each other by a web groove formed in an intervening layer of veneer. The inner terminus of the web groove as well as the terminus of the glue laminate between the tongue forming layers of veneer and the adjacent intervening layer both lie below the surface of the chord when the web and the chord are assembled.