The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 1998
Filed:
Jul. 22, 1996
John Michael Greenway, Westwood, MA (US);
Matthew James Greenway, Westwood, MA (US);
Other;
Abstract
A combination screw and clearance drill is provided that in one mode of operation is able to drill a pilot hole for the screw threads through a top piece of material and then screw into a lower piece of material, thus enabling the two pieces of material to be screwed tightly together in a single operation. The screw is designed in such a manner that the ability of the screw to drill a clearance hole for the threads does not substantially effect the gripping ability of the screw. In one direction of rotation the screw is able to drill the clearance hole for the threads of the screw and by reversing rotation the screw is able to stop drilling a clearance hole and function as a regular screw. Flutes in the screw head cut a counter bore for the head when the head contacts the surface of the top piece of material.