Patent ID: 7189045
Filing Date: 2007-03-13
Classification: F16B,Y10T

Abstract:
1. A screw and composite lumber assembly comprising: a composite lumber member having a top surface and an interior of composite material; a screw comprising a head with a substantially flat top surface, a shank having a pointed tip end and an upper portion and a lower portion, said upper portion being adjacent the head and having a first cross-section with a first diameter, said lower portion having a second cross-section with a second diameter which is less than said first diameter, and being adjacent the tip end, said upper portion and lower portion having threads, the upper portion having a greater number of threads per unit of length than the lower portion, said upper portion threads and first cross-section being associated with a displaced material derived from the interior region of the composite lumber material, said displaced material having been displaced by said lower portion threads, said substantially flat top surface of the head and the composite lumber top surface forming a substantially co-planar interface.