Panel for lift doors

1. A panel ( 10 ) for lift doors, which comprises:

(a) a plate 12 having a generally rectangular shape, whose longer sides extend along the height thereof, the longitudinal edge portions being folded back in a generally “C”-shaped profile to form opposed edges or rims ( 14 ) that are turned inwardly towards the center of said plate, the lower base portion of said plate being folded to form a generally horizontal flat portion ( 22 ) and a generally vertical portion ( 28 ) extending downwardly from said flat portion ( 22 ), and

(b) a plurality of separate stiffening members ( 36 ), each said stiffening member being provided with an extension ( 40 ) along the lower edge thereof, said horizontal flat portion ( 22 ) of said lower base portion of said plate ( 12 ) including a plurality of apertures in which said extensions ( 40 ) are respectively inserted,

each said stiffening member ( 36 ) being formed according to a “U”-shaped profile with integrally extended and opposed side areas featuring a planar development, each said stiffening member ( 36 ) being provided at least at its upper end with a plurality of through openings or hollows for fastening both said stiffening member ( 36 ) and a bearing frame ( 20 ) of a lift shutter handling carriage together to said plate ( 12 ) by means of bolts ( 38 ).

2. A panel according to claim 1 , characterized in that said plate ( 12 ) extends at the top into an integral central appendage ( 16 ) featuring a planar development along which said plurality of through openings ( 18 ) or hollows are formed.

3. A panel according to claim 1 , characterized in that said horizontal flat portion ( 22 ) of said lower base of said plate ( 12 ) is equipped with one or more shaped openings ( 26 ) which at least partially extend along the adjoining vertical portion ( 28 ) of the back fold and receive sliding shoes ( 30 ) that slide along seats ( 32 ) of a sill ( 34 ), said shoes ( 30 ) being connected to said vertical portion ( 28 ) of said lower base of said plate ( 12 ).

4. A panel according to claim 2 , characterized in that said flat portion ( 22 ) of said lower base portion of said plate ( 12 ) is equipped with one or more shaped openings ( 26 ) which partially extend along the adjoining vertical portion ( 28 ) of said lower base portion to receive sliding shoes ( 30 ) that slide along seats ( 32 ) of said sill ( 34 ), said shoes ( 30 ) being. connected to said vertical portion ( 28 ) of said lower base of said plate ( 12 ).

5. A panel according to claim 1 , characterized in that said stiffening members ( 36 ) are folded back according to a “U”-shaped profile which extends into integral and opposed side areas ( 36 ′), said extensions ( 40 ) of said stiffening members being folded back by approximately 90° with respect to said side areas ( 36 ′).

6. A panel according to claim 2 , characterized in that said stiffening members ( 36 ) are folded back according to a “U”-shaped profile which extends into integral and opposed side areas ( 36 ′), said extensions ( 40 ) of said stiffening members being folded back by approximately 90° with respect to said side areas ( 36 ′).

7. A panel according to claim 3 , characterized in that said stiffening members ( 36 ) are folded back according to a “U”-shaped profile which extends into integral and opposed side areas ( 36 ′), said extensions ( 40 ) of said stiffening members being folded back by approximately 90° with respect to said side areas ( 36 ′).

8. A panel according to claim 5 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

9. A panel according to claim 6 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

10. A panel according to claim 6 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

11. A panel according to claim 6 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

12. A panel ( 10 ) for lift doors comprising:

(a) a plate ( 12 ) in a rectangular shape, whose longer sides extend alone the height thereof, the longitudinal edge portions thereof being folded back to form a “C”-shaped profile along the longitudinal direction to form opposed edges or rims ( 14 ) that are turned inwardly towards the central longitudinal axis of said plate, the lower base portion of said plate being equipped with a back fold that is generally “S”-shaped and including a horizontal flat portion ( 22 ), and

(b) a plurality of separate stiffening members ( 36 ), attached to said plate, each said stiffening member provided with an extension ( 40 ) along the lower edge thereof, characterized in that said horizontal flat portion ( 22 ) of said plate is formed with a plurality of apertures ( 24 ) into which said extensions ( 40 ) provided along the lower edge of said stiffening members ( 36 ) are inserted,

and in that each said stiffening member ( 36 ) is formed according to a “U”-shaped profile with integrally extended and opposed side areas having planar surfaces, each said stiffening member ( 36 ) being provided at least at its upper end with a plurality of through openings ( 18 ) for fastening both said stiffening member ( 36 ) and a bearing frame ( 20 ) of a lift shutter handling carriage to said plate ( 12 ) by means of bolts ( 38 ).

13. A panel according to claim 12 , characterized in that said plate ( 12 ) extends at the top into an integral central appendage ( 16 ) featuring a planar development along which said plurality of through openings ( 18 ) or hollows are formed.

14. A panel according to claim 12 , characterized in that said flat portion ( 22 ) of the “S”-shaped back fold of the plate ( 12 ) is equipped with one or more shaped openings ( 26 ) which partially extend along the adjoining vertical portion ( 28 ) of the back fold itself and receive sliding shoes ( 30 ) that slide along the seats ( 32 ) of a sill ( 34 ), said shoes ( 30 ) being connected to said vertical portion ( 28 ) of the “S”-shaped back fold of the plate ( 12 ).

15. A panel according to claim 13 , characterized in that said flat portion ( 22 ) of the “S”-shaped back fold of the plate ( 12 ) is equipped with one or more shaped openings ( 26 ) which partially extend along the adjoining vertical portion ( 28 ) of the back fold itself and receive sliding shoes ( 30 ) that slide along the seats ( 32 ) of a sill ( 34 ), said shoes ( 30 ) being connected to said vertical portion ( 28 ) of the “S”-shaped back fold of the plate ( 12 ).

16. A panel according to claim 12 , characterized in that said stiffening members ( 36 ) are folded back according to a “U”-shaped profile which extends into integral and opposed side areas ( 36 ′) and that said extensions ( 40 ) are folded back by 90° towards the side areas ( 36 ′).

17. A panel according to claim 13 , characterized in that said stiffening members ( 36 ) are folded back according to a “U”-shaped profile which extends into integral and opposed side areas ( 36 ′) and that said extensions ( 40 ) are folded back by 90° towards the side areas ( 36 ′).

18. A panel according to claim 14 , characterized in that said stiffening members ( 36 ) are folded back according to a “U”-shaped profile which extends into integral and opposed side areas ( 36 ′) and that said extensions ( 40 ) are folded back by 90° towards the side areas ( 36 ′).

19. A panel according to claim 16 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

20. A panel according to claim 17 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

21. A panel according to claim 18 , characterized in that said stiffening members ( 36 ) are additionally fastened to said plate ( 12 ) by means of an adhesive material in the form of continuous or discontinuous strips ( 42 ).

22. A panel ( 10 ) for lift doors, which comprises:

(a) a plate 12 having a generally rectangular shape, whose longer sides extend along the height thereof, the longitudinal edge portions being folded back in a generally “C”-shaped profile to form opposed edges or rims ( 14 ) that are turned inwardly towards the center of said plate, the lower base portion of said plate being folded to form a generally horizontal flat portion ( 22 ) and a generally vertical portion ( 28 ) extending downwardly from said flat portion ( 22 ), and

(b) a plurality of separate stiffening members ( 36 ), each said stiffening member being provided with an extension ( 40 ) bent at 90 degrees to said stiffening member and extending along the lower edge thereof, said horizontal flat portion ( 22 ) of said lower base portion of said plate ( 12 ) including a plurality of apertures in which said extensions ( 40 ) are respectively inserted so as to face the underside of said horizontal flat portion in face-to-face relation,

each said stiffening member ( 36 ) being formed according to a “U”-shaped profile with integrally extended and opposed side areas featuring a planar development, each said stiffening member ( 36 ) being provided at least at its upper end with a plurality of through openings or hollows for fastening both said stiffening member ( 36 ) and a bearing frame ( 20 ) of a lift shutter handling carriage together to said plate ( 12 ) by means of bolts ( 38 ).