Tapping assist fastening element and method

A technology for fixing elements and fixtures, applied in the direction of threaded fasteners, locking fasteners, connecting components, etc., can solve the problems of complex design, increased end load, and high manufacturing costs

Inactive Publication Date: 2008-09-03
ND IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This design is complex and expensive to manufacture and also requires a thread forming fixture to engage and cut the threads of the inwardly projecting helix
This often results in increasing the end load or force required to start the tapping process and cracking the fixture

Method used

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  • Tapping assist fastening element and method
  • Tapping assist fastening element and method
  • Tapping assist fastening element and method

Examples

Experimental program
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Embodiment Construction

[0050] With reference to the accompanying drawings, especially Figure 3-4A and 9A-D, which show generally indicated at 10 an embodiment of the fixation element of the present invention. In this particular embodiment, the fixing element of the invention is in the shape of a weld nut 12 with a guide 14 . It should be understood that the structure and principles of the present invention are generally not limited to weld nuts, holders with guides or nuts, and that this embodiment is merely an example of the present invention, by means of a self-tapping holder or tap during the nut tapping process. Engagement, this example can be used with all unthreaded holes in retainers or castings that have internal threads formed therein. The fixing element of the present invention can also form a fixing assembly by engaging with all self-tapping fixings such as screws, bolts, studs and the like having a wide variety of different configurations. The figures and descriptions of the fixation ...

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PUM

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Abstract

A fastening element (10) and method that utilizes a fastener which is capable of forming a fastening assembly by engagement with a self-tapping fastener is disclosed. The fastening element (10) includes one or more indentations (28) formed within a portion of the circumference of an unthreaded bore (22) located within the fastening element. Each indentation (28) has an edge that can have the same helix angle or pitch as the self-tapping fastener that it is to engage to serve as a guide to properly align the fastener within the bore. The indentations also assist formation of mating threads within the element by significantly reducing the required end load to start the tapping process.

Description

field of invention [0001] The present invention relates to fasteners and self-tapping fasteners that use swaging or roll forming methods to form internal threads. More specifically, the present invention relates to a fastener element and method for forming a fastener assembly by engaging a self-tapping fastener that reduces the end load required to initiate the tapping process and has Aids in proper alignment of self-tapping retainers. Background technique [0002] Self-tapping fasteners such as self-tapping screws or bolts fall into two broad categories. The first is that they are provided with cutting edges at the entry end of the workpiece. The second, and most commonly used, are those designed so that a uniform load bearing internal thread is formed into an unthreaded retainer or pilot hole by a swaging operation. The first type of holders have many advantages, the most important of which is that they all form small pieces which are cut from the body into which they a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B39/30F16B35/04F16B37/00
CPCF16B35/047F16B37/005
Inventor 詹姆斯·A·希尔
Owner ND IND INC
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