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US7370505: Method of forming blind holes in a sheet of material

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Filing Information

Inventor(s) Song Cheh Ser · Weng How Leong ·
Assignee(s) Metalform Asia PTE Ltd. ·
Attorney/Agent(s) Nixon & Vanderhye P.C. ·
Primary Examiner Daniel C Crane ·
Application Number US11289638
Filing date 11/30/2005
Issue date 05/13/2008
Prior Publication Data
Predicted expiration date 03/21/2026
Patent term adjustment 111
U.S. Classifications 723/35  · 723/792  · 723/26  ·
International Classifications B21D2826  · B21D3100  ·
Kind CodeB2
Foreign Priority SG2004072518 - 12/01/2004 ·
7 Claims, 7 Drawings


Abstract

A method of forming blind holes in a sheet material is provided. The method includes punching the sheet material to define a hollow projection through the material and shearing a layer of material from the sheet material to form a sealed end over an opening of the hollow projection to form the blind hole. Further processing of the sheet material may be required depending on the desired diameter of the blind hole. Such further processing includes enlarging the hollow projection to a desired diameter of the blind hole and shearing the layer of material with several tapered pins with progressively decreasing diameters. As the scaled end formed is likely to have an uneven surface, the sealed end may be flattened to render a more refined appearance.

Independent Claims | See all claims (7)

  1. 1. A method of forming a blind hole in a sheet of malleable material, comprising: punching a hollow projection through the sheet of malleable material, and then shearing a layer of material on one side of the sheet of malleable material to form a sealed end over an opening of the hollow projection to form the blind hole.

References Cited

U.S. Patent Documents

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US866021 Hansen Sep 1907
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US1652208* McEvoy, Jr. Dec 1927
US3141358* DU PONT Burke, Jr. et al. Jul 1964
US3387481 HARVEY ALUMINUM INC Harvey et al. Jun 1968
US3490121* Biehl et al. Jan 1970
US3731369 Johnson May 1973
US4177665 Schurmann Dec 1979
US6018976* Robert Bosch GmbH Wolf Feb 2000
US6176266* Robert Bosch GmbH Huber et al. Jan 2001
US6408669* Delphi Technologies, Inc. Meeker et al. Jun 2002
US7013696 NGK Spark Plug Co., Ltd. Ando Mar 2006
* cited by examiner

Other Publications

Related U.S. Appl. No. 11/289,648, filed Nov. 30, 2005; Inventors; Ser et al.
Office action issued in U.S Appl. No. 11/289,648, dated May 21, 2007.
Office action issued in U.S Appl. No. 11/289,648, dated Jul. 12, 2007.

Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US7823432 Ibaraki Steel Center Co., Ltd. Masakazu Ooka et al. Nov 2010

Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
US20060117928 Metalform Asia Pte Ltd. Song Ser et al. Jun 2006
SG122844 METALFORM ASIA PTE LTD CHEH SER SONG et al. Jun 2006
US7370505 Metalform Asia PTE Ltd. Song Cheh Ser et al. May 2008