System for fixing accessories on frames made of metal material for doors, windows, and the like
AssigneeSavio S.p.A.
InventorAimone Balbo Di Vinadio
Life of this patent
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Abstract
A system for fixing an accessory on a metal frame for doors, windows, and the like, includes a screw having a head and a self-tapping threaded stem with metric thread, the end of which opposite to the head is tapered. A ratio between the external diameter of the self-tapping stem of the screw and the diameter of the through hole of the wall of the frame is approximately between 1.4 and 1.25, and the ratio between the diameter of the through hole of said wall and its thickness is approximately between 2.5 and 5.5 and more preferably between 3 and 5.
Claims17
An accessory and frame system for fixing an accessory on a metal frame for doors and, windows, the system including;
- a screw having a head and a self-tapping threaded stem;
- an accessory and a frame having adjacent walls formed with corresponding coaxial circular through holes respectively for insertion of the screw and for screwing of said self-tapping stem;
- said self-tapping stem of the screw having a thread with a constant pitch;
- an end of said self-tapping stem opposite to said head of the screw being conical;
- a ratio between the external diameter of the self-tapping stem of the screw and the diameter of the through hole of said wall of the frame is between about 1.4 and 1.25;
- and
- a ratio between the diameter of the through hole of said wall of the frame and the thickness of said wall is between about 2.5 and 5.5;
- and
- wherein said screw has a guide portion having a cylindrical surface between said head and said self-tapping stem.
Dependencies are inferred from the claim text.