Claims
- 1. A method for forming a door frame including a first supporting portion, a second supporting portion and a decorative portion from one sheet, comprising the steps of:
- a first roll-forming step for bending a first portion of the sheet to form the first supporting portion by means of a roll forming machine having a series of roller stands, each of which has a pair of upper rollers and a pair of lower rollers the upper and lower rollers having fixed pieces and roller portions movable relative thereto;
- a second roll-forming step for bending a second portion of the sheet to form the second supporting portion by means of the roll forming machine; and
- a third roll-forming step for bending a third portion of the sheet to form the decorative portion by means of the roll forming machine while simultaneously forming an edge of the decorative portion by relatively moving the roller portions of the upper and lower rollers to the fixed pieces of the upper and lower rollers such that a width of the decorative portion gradually changes.
- 2. A method for forming a door frame according to claim 1, wherein the sheet has a gradually tapered edge so as to change a width of the sheet, a first portion which includes an edge which is arranged opposite to the gradually tapered edge, a second portion which is continuous with the gradually tapered edge and a third portion which is continuous with the first portion and the second portion.
- 3. A method for forming a door frame according to claim 1, wherein the third roll-forming step forms a gradually tapered edge of the decorative portion so as to change the width thereof.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7-190189 |
Jul 1995 |
JPX |
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Parent Case Info
This is a Division of application Ser. No. 08/686,708, filed Jul. 25, 1996.
US Referenced Citations (4)
Foreign Referenced Citations (7)
Number |
Date |
Country |
2-48221 |
Feb 1990 |
JPX |
2-31305 |
Aug 1990 |
JPX |
632139 |
Apr 1994 |
JPX |
6-246356 |
Sep 1994 |
JPX |
6-246358 |
Sep 1994 |
JPX |
1 545 319 |
May 1979 |
GBX |
2 295 783 |
Jun 1996 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
686708 |
Jul 1996 |
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