| (19) |
 |
|
(11) |
EP 1 174 198 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.08.2002 Bulletin 2002/32 |
| (43) |
Date of publication A2: |
|
23.01.2002 Bulletin 2002/04 |
| (22) |
Date of filing: 02.07.2001 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
04.07.2000 JP 2000201746
|
| (71) |
Applicant: YUGEN KAISHA YANO ENGINEERING |
|
Osakashi, Osaka (JP) |
|
| (72) |
Inventor: |
|
- Yano, Sadahide
Osakashi, Osaka (JP)
|
| (74) |
Representative: Thomson, Paul Anthony |
|
Potts, Kerr & Co. 15, Hamilton Square
Birkenhead Merseyside L41 6BR
Birkenhead Merseyside L41 6BR (GB) |
|
| |
|
| (54) |
Metal hollow member and method for manufacturing the same |
(57) A metal hollow member (1) having a plurality of hollow portions (10) extending in
a longitudinal direction thereof and communication apertures (12) formed in a partitioning
wall (11) partitioning adjacent hollow portions is formed by: extruding a molten extrusion
material through a die comprising a female die (3) for forming an outer peripheral
portion of the metal hollow member and a male die (2) including a plurality of hollow-portion-forming
protrusions (2a) corresponding to the plurality of hollow portions (10); and intermittently
supplying fluid insoluble in the molten extrusion material into the partitioning wall
from a bottom portion of a groove formed between the adjacent hollow-portion-forming
protrusions (2a) while extruding the molten extrusion material, whereby the plurality
of communication apertures (12) are formed by fluid-released-apertures (6) from which
the fluid is released.