Document Type and Number:
Japanese Patent JPS496582
Kind Code:
A
Abstract:
Saw-teeth are cut from webs of structural shapes which are to be reconnected in a conventional manner at the tips of the teeth so as to form light beams having a high moment of inertia. The method consists in cutting the web of the shape step-by-step between two tools, each comprising two zones, one of which is a shearing zone proper extending along the length equal to one pitch of the saw-teeth and in which each cutting edge of a tool is substantially parallel to the corresponding edge of the other tool and the other of which is a transition zone immediately preceeding the cutting zone and in which the corresponding cutting edges diverge.
Application Number:
JP3342873A
Publication Date:
January 21, 1974
Filing Date:
March 23, 1973
Export Citation:
International Classes:
B23D15/00; B21D47/04; B23D15/04; B23D23/02; B23D35/00; B26D1/00; (IPC1-7): E04C3/08