Tightening tool for nuts or bolts

Details Tightening tool for nuts or bolts Tightening tool for nuts or bolts

1985-02-21

1986-04-15

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

B25B 1306

Patent

active

045819572

ABSTRACT:
This tool defines an inner opening (2) having a polygonal inscribed profile having six or twelve angles, said profile comprising grooves (3) at the place of said angles for the purpose of clearing the edges of the nut or bolt body to be driven, these grooves (3) being disposed between bearing surfaces (4) adapted to come into contact with the flat surfaces of said body so as to transmit the tightening or untightening torque. Said bearing surfaces (4) are convex in the direction toward the interior of the opening (2), the position of the contact edge of each bearing surface (4) being defined by a distance (x) to the mid-perpendicular (PM) of said flat surface, and the radius of curvature (R) at the contact of the profile of the bearing surface (4) being related to the value x by the relation: ##EQU1## in which: a is the dimension between the flat surfaces of the inscribed profile of the tool,

REFERENCES:
patent: 2969250 (1961-01-01), Kull
patent: 3125910 (1964-03-01), Kavalar
patent: 3742652 (1973-07-01), Enders
patent: 3753320 (1973-08-01), Wurscher
patent: 3908488 (1975-09-01), Andersen
patent: 4016680 (1977-04-01), Moores et al.

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