Patent
1975-03-07
1977-03-08
Britts, Ramon S.
F16B 2300
Patent
active
040106705
ABSTRACT:
An internal spline drive formation for screws is provided wherein the spline drive formation comprises a plurality of circumferentially alternating equiangularly spaced grooves and splines, said splines being defined in part by part-cylindrical surfaces and said grooves being defined in part by surfaces which, when viewed in plan, are arcuate to form a parabola-like line in that the radius of curvature is very small at the regions of intersection between the spline side surfaces and the groove bottom and increases gradually towards the center line of the groove bottoms.
Also disclosed is a screw driving tool the bit end of which comprises an external spline drive formation having a surface which, when viewed in plan, comprises an outer cylinder having sunk therein a plurality of equiangularly spaced grooves, defined in part by re-entrant part-cylindrical surfaces, the regions of intersection between said grooves and said outer cylinder being sharp as contrasted to curved.
REFERENCES:
patent: 2066484 (1937-01-01), Phillips
patent: 2079056 (1937-05-01), Warren
patent: 2375249 (1945-05-01), Richer
patent: 2969250 (1961-01-01), Kull
patent: 3354757 (1967-11-01), Grimm et al.
patent: 3400626 (1968-09-01), Bergere
Britts Ramon S.
Bulten-Kanthal Aktiebolag
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