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US 2021/0239148 A1Published application
Stick fit fastener recess system
AssigneePhillips Screw Company
InventorGary 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 stick fit engagement of existing standard straight walled drivers in the new system.
Claims20
A punch for forming the head end of a recessed head fastener comprising:
- a body having a face configured to form and define 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 wing forming portions radiating outwardly from the central portion, the nib having a nib outer radius defined by a radial distance from the axis to the outer-most extent of the wing forming portions, each of the wing forming portions having a surface configured to form an installation driving surface forming portion and a removal driving surface forming portion, the installation driving surface forming portion and removal driving surface forming portion of adjacent wing forming portions being separated by a respective transition contour forming portion 545, the transition contour forming portion forming the radially inner-most portion of the wing forming portion, and wherein the driving surface forming portions are constructed in substantially parallel alignment with the central longitudinal axis, and a wedge forming portion formed in the transition contour forming portion to present a tapered interface surface forming portion, the interface surface forming portion having a top forming portion, a bottom forming portion and a pair of opposed edge forming portions, the width of the interface surface forming portion tapering from wider at the top forming portion of the interface surface forming portion proximate a top forming portion of the nib to narrower at the bottom forming portion of the interface surface forming portion proximate a bottom of the nib;
- the interface surface forming portion positioned a root (bottom) radial distance from the axis at the bottom of the interface surface forming portion, the root radial distance defining the recess forming portion inner radius, the interface surface forming portion positioned a top radial distance from the axis at the top of the interface surface forming portion, the top radial distance being larger than the bottom radial distance;
- and the ratio of the recess inner radius to the nib outer radius being from about 0.60 to about 0.65.
1 more element
A method of forming a threaded fastener having a driver-engageable recess formed at an end thereof, the method comprising:
- using a punch to form the recess, the punch including:
- a body having a face configured to form and define 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, the nib having a nib outer radius defined by a radial distance from the axis to the outer-most extent of the wings, each of the wings having a surface configured to form an installation driving surface and a removal driving surface, the installation driving surface and removal driving surface of adjacent wings being separated by a respective transition, the contour forming the radially inner-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 transition contour to present a tapered interface surface, the interface surface having a top, a bottom and a pair of opposed edges, the width of the interface surface tapering from wider at the top of the interface surface proximate a top of the nib to narrower at the bottom of the interface surface proximate a bottom of the nib;
- the interface surface positioned a root radial distance from the axis at the bottom of the interface surface, the root radial distance defining the recess inner radius, the interface surface positioned a top radial distance from the axis at the top of the interface surface, the top radial distance being larger than the bottom radial distance;
- and the ratio of the recess inner radius to the recess outer radius being from about 0.60 to about 0.65.
2 more elements
A fastener comprising:
- a head and a shank having a central longitudinal axis, wherein the head is constructed including a recess 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 inward-most portion of the wing, and wherein the driving surfaces are constructed in substantially parallel alignment with the central longitudinal axis of the fastener;
- and a wedge formed in the non-driving transition contour of the fastener wings to present a tapered interface surface, wherein the recess is configured to matingly engage with a corresponding driver bit end such that the driver bit end has a radius at a transition contour greater than a recess inner root radial distance and less than a recess top radial distance.
Dependencies are inferred from the claim text.