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Tack screw

A flat head screw, screw technology, applied in the direction of screws, bolts, nuts, etc., can solve the problems of destroying the mounting holes and the mounting holes can no longer be used.

Inactive Publication Date: 2015-05-13
PEM MANAGEMENT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Removing the flat head pin actually destroys the mounting hole, making the mounting hole unusable and requiring a new mounting hole to be formed during reassembly

Method used

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  • Tack screw
  • Tack screw
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Examples

Experimental program
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Effect test

Embodiment Construction

[0022] Now refer to figure 1 , one embodiment of the grub screw 10 of the present invention will be described in terms of its various features shown sequentially from top to bottom. The screw is a metal fastener with a hex head 11 which is the largest diameter of the fastener and is intended to press fit against the top sheet, thereby pressing the top sheet against the bottom sheet material and fixed. Flats 12 are included on the sides of the hexagonal head 11 to provide surfaces for screwing out the pin after installation, if necessary. A shoulder 13 is located directly below the head. The length of the shoulder is at a vertical height difference from the top sheet and is approximately equal to the sum of the width of the top sheet and the depth to which the shoulder penetrates the bottom sheet. As the screw is pressed in, the bottom 15 of the shoulder displaces the metal of the bottom sheet into the undercut 17 directly below the shoulder and also into the thread 19 belo...

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PUM

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Abstract

The present clinch screw can be secured through a hole in a sheet of metal by a simple press-in application like a tack pin. An undercut clinch feature on the screw shank just underneath the head and above a threaded bulb portion of the shank secures the screw to the sheet as material from the sheet cold-flows into the undercut. Simultaneously, sheet material also flows around and between the bulb threads which forms partial female threads in the sidewall of the sheet hole and provides added pull-out resistance. The screw can then be simply turned out to remove it. In doing so additional female threads are cut into the upper portion of the hole sidewall as the threaded bulb moves upward and then out of the hole. A re-useable threaded hole in the sheet is left behind.

Description

[0001] related application [0002] This patent application is related to, and claims priority from, US Provisional Patent Application No. 61 / 672,320, entitled "Grate Screws," filed July 17, 2012. technical field [0003] This invention relates to riveted fasteners. More specifically, it relates to a push-in flat head pin, which can be removed due to the threaded ball on the shank of the pin, which allows the flat head pin to be removed by unscrewing. Will not significantly damage mounting holes. Background technique [0004] Flat head pins are self-riveting metal fasteners that effectively staple a first sheet to a second sheet of metal by allowing cold metal flow from a second sheet of metal to enter and be received in an undercut on the shank of the pin. piece. Flat-tipped pins are harder than the panel they are pressed into, so flat-tipped pins are a strong means of attaching thin metal components. For the same depth of engagement, flat head pins can have a greater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B35/04
CPCF16B25/0021F16B5/02F16B5/04F16B19/06F16B39/284
Inventor M·马隆尼
Owner PEM MANAGEMENT INC