Browse Prior Art Database

SHEET METAL FASTENING SYSTEM

IP.com Disclosure Number: IPCOM000027470D
Original Publication Date: 1997-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 53K

Publishing Venue

Xerox Disclosure Journal

Abstract

There is provided a method for joining together two sheets of metaL A first metal sheet is provided with a slot. A second metal sheet is provided with a tab. In the joining operation, the tab on the second sheet is inserted through the slot of the first sheet. The protruding end of the tab is then punched with a tool to deform it into ears. The ears are twisted to extend beyond the slot envelope, which prevents the tab from being withdrawn through the slot and thereby provides the join.

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XEROX DISCLOSURE JOURNAL

SHEET METAL FASTENING SYSTEM

D.W. Th. van Breen
G. Hermkens
M. Martens
A. Wiskie

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

There is provided a method for joining together two sheets of metaL A first metal sheet is
provided with a slot. A second metal sheet is provided with a tab. In the joining operation, the tab on the second sheet is inserted through the slot of the first sheet. The protruding end of the tab is then punched with a tool to deform it into ears. The ears are twisted to extend beyond the slot envelope, which prevents the tab from being withdrawn through the slot and thereby provides the join.

In an improvement to the above method the punching tool is provided with a means for detecting when the appropriate amount of deforming force has been applied to the tab. This detection means can, for example, comprise a visual detection means on tool which detects the distance between the deforming head of the tool and the surface of the first slotted metal sheet.

59 XEROX DISCLOSURE JOURNAL - Vol. 22, NO. 2 M~cIdApril1997

DP5.564

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60 XEROX DISCLOSURE JOURNAL - Vol. 22, NO. 2 MXcWAprill997

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