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US 10,371,193 B2Granted
Low energy screws for wood and similar materials
AssigneePhillips Screw Company
InventorBarry J. Hughes
Life of this patent
Estimating the term…
Abstract
A low energy wood screw that may be inserted quickly and using less energy than conventional screws. In various embodiments, the screw may include a countersunk head having a recess for accommodating a driving tool, a tapered neck, a plurality of crown ribs extending over the head and neck, a lubricating coating, main threads with a large thread lead, and lower threads having an asymmetrical profile and extending onto a gimlet point.
Claims46
A low energy wood screw comprising:
- a head having a recess for accommodating a driving tool;
- a shank extending from the head to a point;
- and
- main threads arranged between the head and the point, wherein the main threads have a thread form having a thread depth, the thread form including an outer tip having, a thread tip height and, the thread tip height is from about 32% to about 52% the thread depth,
- wherein the outer tip has a substantially linear profile and the thread form includes a curved section that extends tangent from a lowermost end of the substantially linear profile to a point tangent to the shank.
2 more elements
A low energy wood screw comprising:
- a head having a recess for accommodating a driving tool;
- a shank extending from the head to a point;
- and
- main threads arranged between the head and the point, wherein the main threads have a thread form having a thread depth, the thread form including an outer tip having a thread tip height and the thread tip height is from about 32% to about 52% the thread depth, and wherein the thread form includes a rounded root having a concave profile and the thread tip outer tip has a substantially linear profile and the rounded root includes a lower end tangent to the shank and the lower end is a distance from a central axis of the thread, the distance being about ninety percent to about one hundred ten percent of thread depth.
1 more element
A low energy wood screw comprising:
- a head having a recess for accommodating a driving tool;
- a shank extending from the head to a point;
- and
- main threads arranged between the head and the point, wherein the main threads have a thread form having a thread depth, the thread form including an outer tip having a thread tip height and the thread tip height is from about 32% to about 52% the thread depth, and wherein the main threads have a lead that is from about 60 percent to about 80 percent of an outer diameter of the main threads.
1 more element
A low energy wood screw comprising:
- a head having a recess for accommodating a driving tool;
- a shank extending from the head to a point;
- and
- main threads arranged between the head and the point, wherein the main threads have a thread form having a thread depth, the thread form including an outer tip having a thread tip height and the thread tip height is from about 32% to about 52% the thread depth, wherein the thread form includes a rounded root having a concave profile and the thread tip outer tip has a substantially linear profile, and wherein the concave profile forms the arc of a circle.
1 more element
A low energy wood screw comprising:
- a head having a recess for accommodating a driving tool;
- a shank extending from the head to a point;
- and
- main threads arranged between the head and the point, wherein the main threads have a thread form having a thread depth, the thread form including an outer tip having a thread tip height and the thread tip height is from about 32% to about 52% the thread depth, wherein the thread form includes a rounded root having a concave profile and the thread tip outer tip has a substantially linear profile, and wherein crests of the lower threads conform to a curved profile.
1 more element
Dependencies are inferred from the claim text.