Hollow metal screw and method of making
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United States of America Patent
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Jun 27, 2017
Issued Date -
N/A
app pub date -
Jul 7, 2015
filing date -
Jul 7, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hollow screw and related process of making is provided, wherein the hollow screw is formed from a generally circular corrosion resistant stainless steel disk cut from flat roll stock. The hollow screw includes a head and an elongated and hollow shaft having a wall thickness between about 0.2 to about 0.7 millimeters extending therefrom and defining a shank portion and a threaded portion having a plurality of threads thereon with a rotational drive mechanism configured to facilitate tightening via the threads. The process involves annealing to soften the stamped hollow screw, followed by thread rolling, and then age hardening the hollow screw. As such, the resultant hollow screw is relatively lightweight, about 50% the mass of a solid core screw made from the same material, with a sufficient thread strength to meet most aerospace applications and contributes to important aircraft fuel economy.
First Claim
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International Classification(s)
- B21K:MAKING FORGED OR PRESSED PRODUCTS, e.g. HORSE-SHOE....
- F16B:DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL E....
- B21H:MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. S....
- C21D:MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS....
- B21D:WORKING OR PROCESSING OF SHEET METAL OR METAL TUBE....
- C22C:ALLOYS
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