Browse Prior Art Database

SHEET METAL FASTENING SYSTEM

IP.com Disclosure Number: IPCOM000027545D
Original Publication Date: 1997-Oct-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 80K

Publishing Venue

Xerox Disclosure Journal

Abstract

There is provided a method for joining together two sheets of metal, which is an improvement over the well-known nut-and-bolt method. First and second sheets of metal have a hole drilled through them at the required joining position. A conical indent is punched into the second sheet centred around the drill hole. In the joining operation, the drill holes on the metal sheets are aligned, with the conically indented part of the second metal sheet facing the first metal sheet. A conventional bolt is then in inserted through the first hole and into the conical indentation. Torque is applied to the bolt which thereby, cuts a thread pattern into the conical sides of the indent. As further torque is applied to the bolt, its thread draws the sides of the conical indent radially inward, closing the inside diameter of the hole in the second metal sheet around the threaded parts of the bolt.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 85% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

SHEET METAL FASTENING SYSTEM

D.W. Th. vanBreen
G. Hermkens
M. Martens
A. Wiskie

Proposed Classification
U. S. C1.024/411 Int. C1. A44b 1/04

24A

FIG. 7

XEROX DISCLOSURE JOURNAL - Voi. 22, No. 5 SeptembedOctober 1997 227

[This page contains 1 picture or other non-text object]

Page 2 of 2

SHEET METAL FASTENING SYSTEM (CONT'D)

There is provided a method for joining together two sheets of metal, which is an improvement over the well-known nut-and-bolt method. First and second sheets of metal have a hole drilled through them at the required joining position. A conical indent is punched into the second sheet centred around the drill hole. In the joining operation, the drill holes on the metal sheets are aligned, with the conically indented part of the second metal sheet facing the first metal sheet. A conventional bolt is then in inserted through the first hole and into the conical indentation. Torque is applied to the bolt which thereby, cuts a thread pattern into the conical sides of the indent. As further torque is applied to the bolt, its thread draws the sides of the conical indent radially inward, closing the inside diameter of the hole in the second metal sheet around the threaded parts of the bolt.

    Referring to Fig.1, there is shown an arrangement of first 10 and second 20 metal sheets and bolt 30 in the partially screwed in position. It can be seen that the second sheet 20 has an indented portion 22a, 22b centred around its drill hole....