Patent ID: 7367768
Filing Date: 2008-05-06
Classification: F16B,Y10T

Abstract:
1. A method of fastening composite lumber to a base support comprising: providing a fastener having a head, an upper shank portion having a first cross-section with a first diameter and a lower shank portion having a second cross-section with a second diameter which is less than said first diameter and a tip opposite said head said upper and lower portions being threaded; coupling a driving tool to said head for rotation of said fastener; placing the fastener tip in contact with a top surface of a composite lumber member having an interior of composite material; using the tool to apply torque to said fastener to drive the fastener such that the lower threaded portion enters the interior of the composite material; displacing composite material with threads of the lower threaded portion such that the displaced composite material moves toward the top surface of the composite lumber material; and continuing the rotational driving of the fastener such that the upper threaded portion contacts the displaced composite material and moves the displaced material away from the composite lumber member top surface toward the interior of the composite member and the lower threaded portion engages the base support.