Title:
Tool for dimpling
United States Patent 2421732
US Patent References:
Riveting-machine
- - 1394506

Riveting
- - 2338736

Multiple punch
- - 1612156

Punching and stripping mechanism for presses
- - 2168377

Sheet metal perforating apparatus
- - 2268787


Inventors:
Albert, Orrin W.
Webster, David A.
Publication Date:
06/03/1947
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Assignee:
LOCKHEED AIRCRAFT CORP
Primary Class:
72/313
Other Classes:
72/453.160, 72/415
International Classes:
B21D22/04; B21D22/00
US Patent References:
2265331Sheet material perforating apparatus
2328919Electrically operated dimpling attachment
2288378Dimpling tool
Foreign References:
IT253975B
GB511106A