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Self-threading female fastener elements and method of forming same

A fixing and self-tapping technology, used in threaded fasteners, connecting components, screws, etc., can solve problems such as slowing down the manufacturing process

Inactive Publication Date: 2006-02-15
FABRISTEEL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Referring again to U.S. Patent Nos. 3,775,791 and 3,999,659, the female threaded parts of these two patents are kept integral with the metal strip, requiring a complete set of tapping operations, which also slows down the manufacturing process; moreover, the taps must be replaced periodically or With regular sharpening, the strip must be free of chips, oil and burrs

Method used

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  • Self-threading female fastener elements and method of forming same
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  • Self-threading female fastener elements and method of forming same

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Embodiment Construction

[0024] As mentioned above, the inner hole fixing part and the forming method thereof of the present invention are particularly suitable for application in mass production, but it does not exclude the application in other occasions, and eliminates tapping and tapping of the inner hole fixing part hole, and Requirements for removal of swarf and machining oil. It can be seen from the following description about the formation of a substantially continuous helical thread in the shaped punching hole of the inner hole fixing member that a force is required to screw the male fixing member into the shaped punching hole of the inner hole fixing member, such as in batch As in production, here the female fixing is screwed on the normal male fixing with a torque driver or a wrench, or alternatively, the normal male fixing or a male fixing is screwed into the through-hole of the female fixing. Furthermore, the female fastener of the present invention also provides constant torque because th...

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Abstract

A female fastener having a self-threading bore for threaded receipt of a conventional male threaded fastener which forms a substantially continuous female thread without tapping having a prevailing torque. The bore includes a cylindrical internal surface and a plurality of circumferentially spaced concave recesses having a total volume equal to an annulus defined by a major diameter and an inner diameter of the cylindrical surface. A method of forming selfattaching fasteners by rolling a continuous metal strip having a central pilot, piercing spaced self-threading bores through the pilot and either severing the pilot or the strip. Where the strip is severed into discreet fasteners, the fasteners may be interconnected by a frangible connector.

Description

technical field [0001] The present invention relates to a retainer element having a hole capable of self-tapping or self-tapping upon entry of a standard or conventional helical threaded male retainer, formed by punching a shaped through hole in the bore retainer , when an ordinary helical threaded male fixture, such as a screw or bolt, is screwed in, a continuous helical female thread is formed on this through hole. The self-tapping female fasteners of the present invention also provide constant torque. Furthermore, the present invention also relates to a method of forming a self-integrating female fastener with a self-tapping hole. Background technique [0002] The prior art includes self-tapping and rolling male fasteners, including bolts and screws, which form a helical thread in a cylindrical bore of a female fastener, such as a nut. However, such self-tapping or thread-rolling male fasteners are expensive and have not been widely used in mass production. The prior a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B37/00B21K1/66B21K1/68B21K1/70B23G1/16F16BF16B27/00
CPCF16B27/00B21K1/68B21K1/70B21K1/66F16B37/005Y10T29/49Y10T29/49789F16B37/00B23G1/16
Inventor H·A·拉杜斯于尔
Owner FABRISTEEL PRODS