Threaded – headed fastener – or washer making: process and apparat – Process – Making externally threaded fastener – e.g. – screw or bolt
Reexamination Certificate
2000-04-07
2001-09-11
Tolan, Ed (Department: 3725)
Threaded, headed fastener, or washer making: process and apparat
Process
Making externally threaded fastener, e.g., screw or bolt
C470S016000, C072S256000, C072S299000, C072S371000
Reexamination Certificate
active
06287210
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention is generally directed to a novel process of forming an extruded and axially twisted member, such as a drill, a fastener, a self-drilling/tapping fastener, and the member formed by the process.
In the prior art, a twisted, grooved member, such as a drill, was formed by cutting away material from a blank to form one or more spiral grooves in the blank. The cutting away of material compromises the grain structure of the resulting member causing the resulting member to be weaker. It would be desirable to improve this process such that an improved member results.
The present invention provides such an improved process with the improved member resulting therefrom. Features and advantages of the process of the present invention will become apparent upon a reading of the attached specification in combination with a study of the drawings.
OBJECTS AND SUMMARY OF THE INVENTION
A general object of the present invention is to provide a novel process of forming an extruded and axially twisted member, and the member formed thereby.
An object of the present invention is to provide a member formed by the novel process of the present invention which is capable of long drilling depths, and very efficient chip removal compared to the prior art, owing this capability to the manufacturing process that allows for multiple spiral grooves, of various cross-sectional geometries.
Another object of the present invention is to provide a member formed by the novel process of the present invention which has improved strength with regard to the grain structure versus the prior art.
A further object of the present invention to provide an axially twisted member formed by the process described herein, having at least one spiral groove, such groove being extended, thereby resulting in a more efficient and increased volume of chip removal from out of the drilled hole than the prior art.
Yet a further object of the present invention is to provide a process for forming a member which can provide various amounts of twist to the member and various patterns on the member.
Briefly, and in accordance with the foregoing, the present invention discloses a novel process of forming a member, such as a drill, a fastener, a self-drilling/tapping fastener, and the member resulting from the process. The process includes the steps of: providing a cylindrical blank; extruding a predetermined shape along at least a section of the blank, thereby forming at least two first portions and at least two portions on the extruded section; forming a head on the end of the blank to define a head and a shank; and axially twisting at least a section of the first and second portions a predetermined amount. As a result of the twisting step, each first portion forms a spiral along the length of the twisted section and each second portion forms a spiral along the length of the twisted section. The first portions alternate with the second portions and each second portion defines a spiral groove for transporting material along the length of the shank. The resulting member can be threaded along all or a portion of the shank.
REFERENCES:
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patent: 3455360 (1969-07-01), Simons
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patent: 4779440 (1988-10-01), Cleue et al.
patent: 5074728 (1991-12-01), Hsu
patent: 5571349 (1996-11-01), Nakuzawa et al.
patent: 5759003 (1998-06-01), Greenway et al.
patent: 5771726 (1998-06-01), Bibby et al.
Caccia Michael A.
Janusz Michael
Textron Inc.
Tolan Ed
Trexler, Bushnell Giangiorgi, Blackstone & Marr, Ltd.
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