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US 2011/0217143 A1Published application
Fastener system with stable engagement and stick fit
AssigneePhillips Screw Company
InventorsBarry J. Hughes, Gary Dilling
Life of this patent
Estimating the term…
Abstract
Various embodiments described herein provide a fastener system having straight walled driving surfaces that provides a reliable stick fit feature, while also improving stability of engagement between the system components. A feature of the new system is to allow engagement of existing standard straight walled drivers in the new system.
Claims84
A fastener system comprising:
- a fastener having a head and a shank, the fastener having a central longitudinal axis, wherein the head is constructed having a central portion and a plurality of wings radiating outwardly from the central portion, each of the wings having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward-most portion of the wing, and wherein the driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener;
- a driver having a bit end, the driver having a central longitudinal axis, wherein the bit end is constructed having a central portion and a plurality of lobes radiating outwardly from the central portion, each of the lobes having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward most portion of the lobe, and wherein the driving surfaces of the lobes are constructed in parallel alignment with the central longitudinal axis;
- an interference interface further including:
- a first interference contour formed in at least one of the non-driving transition contours of the fastener wings to present a first tapered interface surface;
- and
- a second interference contour formed in at least one of the non-driving transition contours of the driver bit end lobes to present a second tapered interface surface;
- and
- further wherein the driving surfaces of the fastener head are constructed to receive the driving surfaces of the driver bit end in a mated engagement and the first and second interface surfaces are constructed to form a frictional engagement when the fastener head and driver bit end are in the mated engagement.
5 more elements
A method of constructing a fastener system comprising:
- forming a fastener having a head and a shank, the fastener having a central longitudinal axis, wherein the head is constructed having a central portion and a plurality of wings radiating outwardly from the central portion, each of the wings having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward-most portion of the wing, and wherein the driving surfaces are constructed substantially in parallel alignment with the central longitudinal axis of the fastener;
- forming a driver having a bit end the driver having a central longitudinal axis, wherein the bit end is constructed having a central portion and a plurality of lobes radiating outwardly from the central portion, each of the lobes having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward most portion of the lobe, and wherein the driving surfaces of the lobes are constructed in parallel alignment with the central longitudinal axis;
- forming an interference interface further including:
- a first interference contour formed in at lease one of the non-driving transition contours of the fastener wings to present a first tapered interface surface;
- and
- a second interference contour formed in at least one of the non-driving transition contours of the driver bit end lobes to present a second tapered interface surface;
- and
- further wherein the driving surfaces of the fastener head are constructed to receive the driving surfaces of the driver bit end in a mated engagement and the first and second interface surfaces are constructed to form a frictional engagement when the fastener head and driver bit end are in the mated engagement.
5 more elements
A fastener comprising:
- a head and a shank having a central longitudinal axis, wherein the head is constructed having a central portion and a plurality of wings radiating outwardly from the central portion, each of the wings having an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward-most portion of the wing, and wherein the driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener;
- a wedge formed in the non-driving transition contour of the fastener wings to present a tapered interface surface.
A fastener system comprising:
- a fastener having a head and a shank, the fastener having a central longitudinal axis, wherein the head is constructed having drive surfaces for installation and removal, and wherein the fastener drive surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener;
- a driver having a bit end, the driver having a central longitudinal axis, wherein the bit end is constructed having drive surfaces for installation and removal, and wherein the driver drive surfaces are constructed in parallel alignment with the central longitudinal axis;
- an interference interface further including:
- a first interference contour formed in at least one of the fastener drive surfaces to present a first tapered interface surface;
- and
- a second interference contour formed in at least one of the driver drive surfaces to present a second tapered interface surface;
- and
- further wherein the driving surfaces of the fastener head are constructed to receive the driving surfaces of the driver bit end in a mated engagement and the first and second interface surfaces are constructed to form a frictional engagement when the fastener head and driver bit end are in the mated engagement.
5 more elements
A method of constructing a fastener system comprising:
- a fastener having a head and a shank, the fastener having a central longitudinal axis, wherein the head is constructed having drive surfaces for installation and removal, and wherein the fastener drive surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener;
- a driver having a bit end, the driver having a central longitudinal axis, wherein the bit end is constructed having drive surfaces for installation and removal, and wherein the driver drive surfaces are constructed in parallel alignment with the central longitudinal axis;
- an interference interface further including:
- a first interference contour formed in at least one of the fastener drive surfaces to present a first tapered interface surface;
- and
- a second interference contour formed in at least one of the driver drive surfaces to present a second tapered interface surface;
- and
- further wherein the driving surfaces of the fastener head are constructed to receive the driving surfaces of the driver bit end in a mated engagement and the first and second interface surfaces are constructed to form a frictional engagement when the fastener head and driver bit end are in the mated engagement.
5 more elements
A punch for forming the head end of a recessed head fastener comprising:
- a body having a face configured to form and defined the outer contour of the head;
- a nib integral with the body and extending from the face, the nib having a central longitudinal axis, wherein the nib is constructed having a central portion and a plurality of wings radiating outwardly from the central portion, each of the wings having a surface configured to form an installation driving surface and a removal driving surface, separated by a non-driving transition contour, the non-driving transition contour forming the radially outward-most portion of the wing, and wherein the driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis;
- and
- a wedge formed in the non-driving transition contour of the wings to present a tapered interface surface.
1 more element
Dependencies are inferred from the claim text.