Elco Industries, Inc.

Donald G Whitchurch

A joint structure for use in securing an article to the edge of a piece of composition board includes a screw having an elongated shank with an enlarged head integrally formed with one end thereof and a threaded section formed on the opposite end portion. First and second helical threads in the threaded section having different major diameters are used to secure the fastener within a pre-drilled hole formed in the edge of the particle board. The hole includes an outer end portion whose diameter is greater than the major diameter of the larger thread and whose length is approximately equal to the length of the threaded section of the shank. In addition, the hole includes an inner end portion which opens into and is coaxial with the outer end portion and which has a diameter smaller than the major diameter of the smaller thread. The length of the hole is longer than the length of the shank of the screw.

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Rockford, IL, United States of America

Donald G Whitchurch