§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4581957A Expired / Lapsed US ⏱️ 0.0 years remaining

Tightening tool for nuts or bolts

Assignee: Facom SA
•
Filing: 1985-02-21
•
Granted: 1986-04-15
•
Expires: 2005-02-21
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

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, x is the distance between the contact edge of the mid-perpendicular (PM) of the flat surface, R is the radius of curvature at the contact of the profile of the bearing surface.

Inventors

  • 👤 Michel Dossier

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 14:22
CPC Classifications
B; B25; B25B; B25B13/00; B25B13/02; B25B13/06; B25B13/065

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 195 words
A tool for driving screw-threaded nut or bolt objects, said tool defining an inner opening having an inscribed polygonal profile having at least six angles, said profile comprising grooves at the place of said angles for the purpose of clearing edges of the nut or bolt body to be driven, two bearing surfaces disposed on each side of each groove, said bearing surfaces being provided for coming into contact with flat surfaces of said body so as to transmit a tightening or untightening torque, said bearing surfaces being convex in a direction toward the interior of said opening, the position of the contact edge of each bearing surface being defined by a distance x to the mid-perpendicular of said flat surface, and the radius of curvature R of contact of the profile of the bearing surface being related to the value x by the relation: ##EQU5## in which: a is the dimension between the flat surfaces of the inscribed profile of the tool, x is the distance between the contact edge and the mid-perpendicular (PM) of the flat surface, R is the radius of curvature, at the contact, of the profle of the bearing surface.
Claim 2
Dependent Claim 195 words
A tool for driving screw-threaded nut or bolt objects, said tool defining an inner opening having an inscribed polygonal profile having at least six angles, said profile comprising grooves at the place of said angles for the purpose of clearing edges of the nut or bolt body to be driven, two bearing surfaces disposed on each side of each groove, said bearing surfaces being provided for coming into contact with flat surfaces of said body so as to transmit a tightening or untightening torque, said bearing surfaces being convex in a direction toward the interior of said opening, the position of the contact edge of each bearing surface being defined by a distance x to the mid-perpendicular of said flat surface, and the radius of curvature R of contact of the profile of the bearing surface being related to the value x by the relation: ##EQU5## in which: a is the dimension between the flat surfaces of the inscribed profile of the tool, x is the distance between the contact edge and the mid-perpendicular (PM) of the flat surface, R is the radius of curvature, at the contact, of the profle of the bearing surface.
Claim 3
Dependent Claim 22 words
A tool according to claim 1, wherein said bearing surface has a profile in the shape of an arc of a circle.
Claim 4
Dependent Claim 42 words
A tool according to claim 1, wherein, in the case where said profile has six angles, said bearing surface is connected, on the side thereof opposed to said groove to a planar surface coinciding with the flat surface of the inscribed profile.
Claim 5
Dependent Claim 38 words
A tool according to claim 1, wherein, in the case where said profile has twelve angles, each bearing surface on the side of a groove is connected to a bearing surface on the side of the neighbouring groove.

References Cited (Backward Citations)

US3125910A Cited
US2969250A Cited
US3753320A Cited
US3742652A Cited
US3908488A Cited
US4016680A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-04-14 1989-10-14 1990-04-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-04-14 1993-10-14 1994-04-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-04-14 1997-10-14 1998-04-15 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag