1974-02-26
1976-07-20
Britts, Ramon S.
10 24, 10 27R, 85 9R, F16B 2300, F16B 3500
Patent
active
039699749
ABSTRACT:
The wrenching portion of a nut or a bolt head is provided with a configuration which, when viewed in plan, comprises an outer cylinder having a plurality of grooves defined in part by re-entrant concave surfaces and equiangularly spaced about its periphery, the regions of intersection of the grooves with the outer cylinder being planar. The grooves may be altogether part-cylindrical in cross section, or may they have a part-cylindrical bottom surface which merges with two planar inclined side surfaces.
Also disclosed is a matrix or die for use in manufacture of nuts or bolts having a splined wrenching portion, said matrix or die having a die cavity adapted to form the regions of intersection of the grooves with the outer cylinder as planar surfaces.
REFERENCES:
patent: 2969250 (1961-01-01), Kull
patent: 3352190 (1967-11-01), Carlson
patent: 3354757 (1967-11-01), Grimm et al.
Britts Ramon S.
Bulten-Kanthal Aktiebolag
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