zinkenbefestigung in eggenrahmen

摘要

1,091,612. Agricultural implements. INTERNATIONAL HARVESTER CO. Nov. 15, 1965 [Dec. 2, 1964], No. 48400/65. Heading A1B. Harrow teeth 16 are fixed to tubular cross-bars 11 by driving the teeth 16 through the walls of the tube so that the metal of the tube ruptured by the pointed end of the teeth closely surrounds and grips the teeth. An annular die may be placed beneath the bar to control the shape of the ruptured metal that projects outwardly of the bar around the shank of the teeth. To increase the locking engagement of the teeth with the bars, the metal of the teeth and bars is caused to age and rust particularly in the areas of the interlock.