B - Operations – Transporting – 25 – B
Patent
B - Operations, Transporting
25
B
B25B 23/00 (2006.01) F16B 23/00 (2006.01)
Patent
CA 2141722
A screw for snugly-fitted tightening pairs, of the type having a lobate head or a lobate-socket head (31), in which each lobe (37) is formed of one face (37') directed in a substantially circumferential manner and two other substantially parallel faces (35, 36) directed inwardly of the screw; said screw is provided with a reaction surface (33) with a tightening wrench (32). The portions of said reaction surface (33) included between two adjacent lobes are comprised each of a pair of faces (38, 39) inclined to each other to form an angle concave towards the outside of the screw, so as to constitute a reaction surface with a wrench of a polygonal profile. Such a screw can be operated to advantage either with the polygonal wrenches of the known art, or with an innovatory mating wrench of a lobate configuration.
As.tec. Assistenza Tecnica S.r.l.
Smart & Biggar
LandOfFree
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