Low torque wood screw
First Claim
1. A low torque fastener screw for securing a wooden workpiece to a substrate, the fastener screw comprising:
- an elongated body defining a longitudinal axis;
an enlarged head portion disposed on an end of the elongated body, the head portion having a generally planar end surface disposed substantially transverse to the longitudinal axis and having a drive recess therein;
an external thread disposed on an opposite end of the elongated body and terminating in a point to facilitate entry of the screw into the wooden workpiece and substrate;
an elongated generally cylindrical shank coaxial with the longitudinal axis and disposed between the enlarged head and the thread; and
a generally annular reamer surface coaxial with the longitudinal axis and disposed between the external thread and elongated shank, the reamer surface having an outer diameter larger than the shank but less than a major diameter of the external thread so as to ream a clearance hole for substantially non-interfering entry of the elongated shank into the wooden workpiece as the fastener screw is driven through.
1 Assignment
0 Petitions
Accused Products
Abstract
A low torque fastener screw for securing a wooden workpiece to a substrate includes an elongated body defining a longitudinal axis and having an enlarged head formed on one end, an external pointed thread formed on an opposite end, an elongated unthreaded shank between the enlarged head and the threaded end, and a reamer formed at the juncture of the shank and thread. The reamer has a plurality of longitudinal cutting edges formed about its periphery which ream out the hole formed by the threaded end to a diameter larger than the shank, thereby reducing frictional resistance to rotation of the screw and optimizing the torque applied by the driving tool.
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Citations
13 Claims
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1. A low torque fastener screw for securing a wooden workpiece to a substrate, the fastener screw comprising:
- an elongated body defining a longitudinal axis;
an enlarged head portion disposed on an end of the elongated body, the head portion having a generally planar end surface disposed substantially transverse to the longitudinal axis and having a drive recess therein;
an external thread disposed on an opposite end of the elongated body and terminating in a point to facilitate entry of the screw into the wooden workpiece and substrate;
an elongated generally cylindrical shank coaxial with the longitudinal axis and disposed between the enlarged head and the thread; and
a generally annular reamer surface coaxial with the longitudinal axis and disposed between the external thread and elongated shank, the reamer surface having an outer diameter larger than the shank but less than a major diameter of the external thread so as to ream a clearance hole for substantially non-interfering entry of the elongated shank into the wooden workpiece as the fastener screw is driven through. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- an elongated body defining a longitudinal axis;
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9. A low torque screw for securing a wooden workpiece to a substrate, such screw comprising:
an elongated unitary body divided into a first end and a second end along a longitudinal axis by a circumferential series of axially extending serrations of a generally larger overall diameter than a center portion of the first end;
an enlarged head portion disposed on a distal end of the unitary body at the first end, the head portion having a generally planar end surface disposed substantially transverse to the longitudinal axis of the center portion of the first end and having a drive recess therein, the head portion having an underside defined by a generally concave annular surface interposed between the end surface and the center portion of the first end;
an external thread disposed on the second end of the unitary body terminating in a point at a distal portion of the second end, the external thread having a generally longitudinal cutting edge and chip relief slot formed therein adjacent the pointed end.- View Dependent Claims (10, 11, 12)
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13. A low torque screw fastener system for securing a wooden workpiece to a substrate comprising:
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a wooden workpiece; a substrate; a fastener screw comprising; an elongated body defining a longitudinal axis; an enlarged head portion disposed on an end of the elongated body, the head portion having a generally planar end surface disposed substantially transverse to the longitudinal axis and having a drive recess therein; an external thread disposed on an opposite end of the elongated body and terminating in a point to facilitate entry of the screw into the wooden workpiece and substrate; an elongated generally cylindrical shank coaxial with the longitudinal axis and disposed between the enlarged head and the thread; and a generally annular reamer surface coaxial with the longitudinal axis and disposed between the external thread and elongated shank, the reamer surface having an outer diameter larger than the shank but less than an outer diameter of the external thread so as to ream a clearance hole for substantially non-interfering entry of the elongated shank into the wooden workpiece as the fastener screw is driven through.
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Specification