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1. WO1991007565 - CHAINE DE PRODUCTION DE GRILLAGES A L'EPREUVE D'EFFRACTIONS ET GRILLAGES AINSI PRODUITS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A production line for the automated manufacture of burglarproof grilles made of longitudinal sections or rods held together with the help of spacers or ties, and intended for mounting in side-frame sections which also enable rolling-up, said side-frame sections being of a type already found on the market as, for example, extruded aluminium sections, c h a r a c t e r i z e d by:
- a spool or reel (10) of steel wire (1) of sufficient thickness and hardness,
- a straightening press (15) to cold draw said wire (1) into a continuous length of straight and stiff working material ,
- a bending module (20) to pull said wire (1) forward and to impart to said wire the desired wave shape,

- an annealing module (25) to anneal said wire on short, limited segments,
- a heating module (30) to heat said wire,
- a coating box (40) to coat said heated wire with nylon powder,
- a cooling module (50) to bring the temperature of said wire back to near room temperature,
- a trimming module (60) for cutting said wire to predetermined lengths ,
- a collecting trough (70) to collect the cut lengths of said wire and position them in the required
direction,
- an assembly table (80) for the assembly of said individual wire lengths with ties (2) to give a finished burglarproof grille.

2. The production line of claim 1, c h a r a c t e ri z e d in that said wire (1) on said reel (10) has a diameter of more than 5 mm and a hardness equivalent to that of drawn carbon-enriched spring steel or better.

3. The production line of claim 1, c h a r a c t e ri z e d in that said bending module (20) has bending wheels equipped with stamping sheets between their teeth to provide accuracy of reproduction of the bends, and in that the pressure on the wire section is adjusted to just over the material's yield point.

4. The production line of claim 1, c h a r a c t e ri z e d in that said annealing module (25) brings the segments to be annealed to a temperature of about 700 degrees Celsius over a length of approximately 2 cm, and that said heating module (30) heats said wire to a temperature of 250 to 300 degrees Celsius with the help of a propane burner.

5. The production line of claim 1, c h a r a c t e ri z e d in that an electrostatically charged nylon powder is blown into said coating box ( 40 ) and said powder melts on the surface of said hot steel wire.

6. The production line of claim 1, c h a r a c t e ri z e d in that said trimming module (60) is controlled by a PLC.

7. The production line of claim 6, c h a r a c t e ri z e d in that said trimming module (60) is equipped with a carriage and flying shears to trim said steel wire (1 ) .

8. The production line of claim 1, c h a r a c t e ri z e d in that the feeding of said lengths of wire (1 ) to the feeding unit (82) of said assembly table (80) and the feeding of said ties (2) in the slots of the slide bars (88) is effected by pneumatic pistons (84,90).

9. A burglarproof grille for mounting in front of display windows or doors and consisting of preferably horizontal rods or sections with spacers, braces or ties which hold the elements together, and intended for mounting in side-frame sections on the sides of said windows or doors, c h a r a c t e r i z e d in that

- said rods (1) are produced by pulling drawn carbon-enriched spring steel from a reel (10) through a bending module (20) to be given an approximately sinusoidal wave shape before being coated with a hardwearing coloured nylon coating and trimmed to predetermined lengths ,

- and said spacers or ties (2) are in the shape of rectangular pieces of hardwearing plastic, with
perforations for said rods (1).

10. The burglarproof grille of claim 9,
c h a r a c t e r i z e d in that every eighth said tie (2) has an embedded hardened steel chain as
reinforcement, while said ties themselves have one or alternatively two separate perforations for the passage of said rods (1 ) .