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US 2018/0003209 A1Published application
Drill point fastener
AssigneeHargis Industries, LP, Dba St Fastening Systems
InventorJOE A. HARGIS
Life of this patent
Estimating the term…
Abstract
A fastener may include an elongated shank, a head at a distal end of the shank, and a drill point at a terminal end of the shank, which is opposite to the distal end. The fastener may include a primary thread starting at the drill point and extending along the shank towards the head. The fastener may include a secondary thread starting at the drill point, extending along the shank towards the head, and stopping in an axial direction before the primary thread ends. The secondary thread may be radially located 180 degrees from the primary thread. The drill point may include a plurality of radially extending cutting edges and one or more relieved flute portion extending along the surface of the drill point.
Claims18
A fastener comprising:
- an elongated shank;
- a head at a distal end of the shank, the head adapted for receiving torque to rotate the fastener;
- a drill point at a terminal end of the shank, which is opposite to the distal end;
- a primary thread starting at the drill point and extending along the shank towards the head at the distal end of the shank;
- and
- a secondary thread starting at the drill point, extending along the shank towards the head, and stopping in an axial direction before the primary thread ends, wherein the secondary thread is radially located 180 degrees from the primary thread, and the drill point including a plurality of radially extending cutting edges and one or more relieved flute portions extending along the surface of the drill point.
3 more elements
A fastener for joining an object to another, comprising:
- a proximal head having a portion adapted for receiving torque to rotate the fastener;
- an annular tapered portion joined to the torque receiving portion;
- and
- a shank portion joined to and extending from the annular tapered portion, the shank portion having a first thread and a second thread, the shank terminating at a distal tapered drill point remote from the head portion, the tapered point adapted to extend through a preformed aperture in the object or to create such aperture as it is rotationally forced against the object, the first thread having a beginning at the tapered drill point and spirally extending along the periphery of the shank at a defined pitch and terminating at a predetermined first axial location from underside of the head, the second thread having a beginning at the tapered drill point and extending spirally along the periphery of the shank at the predetermined pitch, the second thread being located between convolutions of the first thread and terminating at a predetermined second axial location from underside of the head, the first thread and the second thread having a radially extended height, the height of the first thread transitionally increasing from a first height to a second height at a predetermined axial location in a plane normal to the axis of the shank and transitionally decreasing from the second height until it merges flush into the shank, the second thread transitionally increasing from the first height to the second height at the predetermined axial location in a plane normal to the axis of the shank, the second thread transition being essentially coplanar with the first thread transition, and the second thread spirally extending uninterruptedly at the second heights to the predetermined axial location.
1 more element
A fastening system comprising:
- a fastener for joining an object to another, comprising:
- a proximal head having a portion adapted for receiving torque to rotate the fastener;
- an annular tapered portion joined to the torque receiving portion;
- and a shank portion joined to and extending from the annular tapered portion, the shank portion having a first thread and a second thread, the shank terminating at a distal tapered drill point remote from the head portion, the tapered point adapted to extend through a preformed aperture in the object or to create such aperture as it is rotationally forced against the object, the first thread having a beginning at the tapered drill point and spirally extending along the periphery of the shank at a defined pitch and terminating at a predetermined first axial location from underside of the head, the second thread having a beginning at the tapered drill point and extending spirally along the periphery of the shank at the predetermined pitch, the second thread being located between convolutions of the first thread and terminating at a predetermined second axial location from underside of the head, the first thread and the second thread having a radially extended height, the height of the first thread transitionally increasing from a first height to a second height at a predetermined axial location in a plane normal to the axis of the shank and transitionally decreasing from the second height until it merges flush into the shank, the second thread transitionally increasing from the first height to the second height at the predetermined axial location in a plane normal to the axis of the shank, the second thread transition being essentially coplanar with the first thread transition, and the second thread spirally extending uninterruptedly at the second heights to the predetermined axial location;
- and
- a sealing washer having a through-bore aperture and positioned with the fastener shank extending through the aperture, the washer being located at the terminus of the second thread and being supported by the thread termini from freely moving axially along the shank and thereby being undesirably displaced axially toward the fastener distal end.
3 more elements
Dependencies are inferred from the claim text.