Apparatus for increasing blank holding pressure during drawing operation
United States Patent 2843071
US Patent References:
/0913841.html
- - 0913841

Press having spring-pressed blank holders
- - 1475437

Die for flanging sheet metal
- - 1780433

Die
- - 1923334

Art of producing sheet metal reflectors
- - 1943978


Inventors:
Kitzinger, Joseph A.
Publication Date:
07/15/1958
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Assignee:
Borg, Warner
Primary Class:
72/351
Other Classes:
220/DIG.022
International Classes:
B21D22/26; B21D24/06; B21D24/00
US Patent References:
2002097Method and apparatus for making sheet metal articles
2268838Process for making wheels
2312749Method of making thin sheet metal shells
Foreign References:
NO20209A