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US 7,255,523 B2Granted
Dual threaded screw for composite materials
AssigneePrime Source Building Products, Inc.
InventorCyril Laan
Life of this patent
Estimating the term…
Abstract
An improved dual threaded fastener for composite materials having a head and a shaft. The head is affixed to one end of the shaft and the shaft includes a point at its other end. The shaft includes an upper threaded portion and an upper threaded portion. The diameter of the shaft within the lower threaded portion is greater than the diameter of the shaft within the upper threaded portion. In this manner, as the fastener is rotated within the workpiece, producing remnants may be stored in the area surrounding the upper threaded portion.
Claims18
A fastener comprising:
- a head;
- a shaft having a first and second end, said head being affixed to the shaft at the first end of the shaft and the second end of the shaft having a point;
- said shaft having an upper threaded portion and a lower threaded portion, the upper threaded portion being closer to the head end than the lower threaded section;
- said upper threaded portion having a first shaft diameter, the lower threaded portion having a second shaft diameter, wherein the first shaft diameter is less than the second shaft diameter;
- said head having an outer diameter greater than the outer thread diameter of the upper threaded portion and the lower threaded portion;
- and
- said upper threaded portion having a first thread angle and said lower threaded portion having a second thread angle, wherein the first thread angle is greater than the second thread angle.
4 more elements
A fastener comprising:
- a head;
- a shaft having a first and second end, said head being affixed to the shaft at the first end of the shaft and the second end of the shaft having a point;
- said shaft having an upper threaded portion and a lower threaded portion, the upper threaded portion being closer to the head end than the lower threaded section;
- said upper threaded portion having a first shaft diameter and a first thread angle, said lower threaded portion having a second shaft diameter and a second thread angle, wherein the first shaft diameter is less than the second shaft diameter and said first thread angle is greater than said second thread angle;
- and
- said head is provided with a top surface having a recess to receive a driving tool and a bottom surface having an annular ridge.
3 more elements
A screw comprising:
- a head;
- a shaft having a first end and a second end, said head being affixed to the shaft at the first end of the shaft and the second end of the shaft having a point;
- the shaft having an upper threaded portion and a lower threaded portion, the upper threaded portion being closer to the head end than the lower threaded section;
- said upper threaded portion having a first shaft diameter, a first thread angle and a first outer thread diameter, said lower threaded portion having a second shaft diameter, a second thread angle and a second outer thread diameter, wherein said first shaft diameter is less than the second shaft diameter, said first thread angle is greater than said second thread angle, and said first outer thread diameter is less than said second outer thread diameter;
- and
- said head is provided with a top surface having a recess to receive a driving tool and a bottom surface having an annular ridge.
3 more elements
Dependencies are inferred from the claim text.