FR2821113A1 - ANTI-LIFT TIE-DOWN FOR ROLLER SHUTTER - Google Patents

Abstract

The anti-lift fastener (1) for a roller shutter consists of a plastic part, which at rest has a curved profile substantially in an arc of a circle, and in which is formed at least one transverse groove (2) opening into the 'extrados (1a) of the part and delimiting a flexible articulation zone (3) of thinner thickness (e'), the parts of said part on either side of each groove 2 forming two rigid links (4) . Said part is elastically deformable in a locking position in which its links (4) are in abutment and its radius of curvature is greater than its initial radius of curvature at rest.

Description

ANTI-LIFT TIE-DOWN FOR ROLLER SHUTTER

  The main object of the present invention is an anti-lift attachment for a roller shutter, which attachment, once mounted on the roller shutter, connects the roller shutter deck to the winding drum of

  this deck, and allows to block the deck in the deployed position.

  Roller shutters are commonly used in a building to protect doors, windows, or the like. A roller shutter generally comprises an apron which consists of lo loops hinged together, which can be rolled up on a rotary drum, and which is guided in vertical slides. Depending on the type of roller shutter, the rotation of the drum for unwinding or winding the deck can be controlled manually by means of a crank acting on a gear winch, and / or electrically at

  by means of a gear motor coupled to the axis of rotation of the drum.

  In order for a roller shutter to provide dissuasive protection against burglary attempts, it is important to equip this shutter with an anti-lift device, also called a self-locking device, having the general function of locking the apron of the roller shutter in the deployed position, and to oppose a lifting of this deck, by direct manipulation of the deck, and in particular by

lifting of the apron.

  Many anti-lift devices fulfilling this function have been proposed to date, among which is the implementation of a semi-rigid and articulated anti-lift attachment which connects the upper blade of the roller shutter deck to the drum. winding. Examples of embodiments of anti-lift fasteners for rolling shutters are described in French patent applications.

FR-A-2 775 314 and FR-A-2 584130.

  In French patent application FR-A-2 775 314, the anti-lifting linkage is formed by several links hinged together by hinge systems, each link being furthermore provided with flexible blades which come to bear under the following link; the locking of the bulkhead in the fully extended position is obtained by

bracing of the links.

  In French patent application FR-A-2 584 130, the anti-lifting attachment is constituted by several independent links each formed by a rigid flat blade, and fixed by means of rivets on elastic steel spring blades, the links fitting into each other in the deployed position of the fastener. More particularly, for their nesting, each link has on these two opposite longitudinal edges complementary concave and convex shapes. The aforementioned anti-lift fasteners are relatively expensive to manufacture because their production first requires the i5 manufacture of different parts constituting the fastener and

  secondly, an assembly operation of these different parts.

  Also, the complexity of the structure of these anti-lift fasteners

  is prejudicial to their reliability and their identity over time.

  The present invention provides an anti-lift attachment for a roller shutter, of simple structure, inexpensive to manufacture, while

  being robust and reliable over time.

  The anti-lifting attachment of the invention is typically made of a plastic part, which at rest has a curved profile substantially in an arc, and in which is formed at least one transverse groove opening into the upper surface of the part and delimiting a flexible articulation zone of smaller thickness, the parts of said part on either side of each groove forming two rigid links, said part being elastically deformable in a locking position in which its links are in abutment and its radius of curvature is

  greater than its initial radius of curvature at rest.

  The invention also relates to a rolling shutter, the deck of which is fixed to the drum by means of one or more

  anti-lift fasteners according to the invention.

  Other characteristics and advantages of the invention

  will appear more clearly on reading the description below

  of a preferred embodiment of the invention, which

  description is given by way of nonlimiting example and with reference

  in the accompanying drawings in which: - Figure l is a perspective representation of a portion of 0 roller shutter drum fitted with an anti-lift attachment of the invention in its initial position at rest, Figure 2 is a view side of the drum and the anti-lifting clip of Figure 1; - Figure 3 is a cross section along the plane lil-lil of Figure 2; - Figure 4 is a perspective representation of the drum and the anti-lifting attachment of Figures 1 to 3, the anti-lifting attachment being in the locked position, and its lower link being connected to the upper blade of an apron roller shutter in position 2 o deployed, - and Figure 5 is a side view of the drumlattache assembly

  anti-lift / apron in Figure 4.

  FIG. 1 shows the end of a drum T of

  roller shutter fitted with an anti-lift attachment 1 according to the invention.

  2 5 In practice, and preferably, a wheel wheel drum is equipped with two anti-lift fasteners positioned respectively at its two end parts. If the width of the roller shutter curtain is large (winding drum of

  significant length), one or more anti-fasteners can be provided

  additional intermediate lift positioned in the section

middle of the drum.

  In the variant of Figures 1 to 5, the drum T consists of a hollow tube in the periphery of which is provided a groove

  longitudinal G allowing the mounting of the anti-lift attachment 1.

  This drum is usually equipped with means (not shown) allowing it to rotate in one direction or the other. For better clarity of the drawings, these drive means have not been shown; in a known manner according to the type of rolling shutter, these drive means comprise for example a crank acting on a gear winch, or are of the electric type and comprise a geared motor coupled to the axis of

drum rotation.

  The anti-lift attachment 1 is a plastic part which is in the general form of a plate which at rest has a curved profile substantially in the shape of an arc of a circle (see FIG. 2), and in the length of which are made transverse grooves 2 mutually parallel, each groove 2 opening into the upper surface 1a of the curved part 1. Each groove 2 delimits in the thickness of the part 1, a flexible hinge zone 3 of smaller thickness (') . The parts of the part 1 on either side of a transverse groove 2 form rigid links 4,4 'of greater thickness. In the particular example illustrated, the anti-lift attachment 1 comprises seven identical links 4 of rectangular shape, width (L) and thickness (), and a rigid link 4 ', forming the lower end

  of the fastener 1 and comprising a hook-shaped profile.

  More particularly, in the two lateral edges 4a and 4b of each rigid link 4 are provided respectively two U-shaped slots. Allowing the attachment of the link in the groove G of the drum T. In another variant, the slots 5 could be

  replaced by holes through the thickness of the link 4.

  According to another essential characteristic of the invention, the anti-lift attachment 1 is elastically deformable at its hinge zones 3 and can under mechanical stress be deformed in a so-called locking position, in which the links 4,4 'are in abutment, and the radius of curvature of the part is greater than the radius of

  initial curvature of the part in the absence of mechanical stress.

  This locking position is that illustrated in FIG. 4 or 5. Preferably, in its locking position, the fastener 1 is flat or

  almost planar, its upper surface 1a being planar or almost planar.

  The deformation of the anti-lifting attachment 1 results in a tightening of each groove 2 until the opposite transverse edges 4c of two adjacent links 4 abut against each other, thus closing at the level of the upper surface 1a of the fastener 1, the transverse groove 2 separating them. When the mechanical strain constraint is released, the anti-lifting attachment 1 resumes its initial configuration at rest (Figure 2), the transverse grooves 2 opening at the upper surface 1, by spacing

  opposite transverse edges 4c of the links 4.

  The anti-lift part 1 which has just been described is preferably manufactured by molding a thermoplastic material in a suitable mold. This mold is designed in such a way that at the end of the mold, the part 1 forming the anti-lift attachment exhibits the profile at rest

Figure 2 curve.

  In an alternative embodiment given by way of nonlimiting example, the anti-lift attachment was made of polypropylene; The thickness () of each link 4 was approximately 5 mm, and the thickness

  () of each hinge zone 3 was worth approximately 1 mm.

  In the particular example illustrated, each transverse groove 2 has a T-profile. This particular profile, although preferred, is however not limitative of the invention In the particular example illustrated, the mounting of the fastener 1 on 3 o the drum T is produced by means of a clamping piece 6 comprising two threaded holes 7. This clamping piece 6 is slidably mounted in the groove G of the drum T. having been introduced by one of the two ends of the groove G. The attachment of the fastener 1 to the drum T is carried out by means of fixing screws 8 passed through the slots 5 of the end link 4 and the tapped holes 7 of the clamping part 6. By clamping screws 8, the clamping part 6 / link 4 is blocked in translation with respect to the drum T. Once the anti-lifting attachment (s) 1 are fixed on the drum T. we assemble with the lower link 4 'of each fastener 1, the roller shutter curtain 9, which is usually consisting of a plurality of hinged blades 10. To this end, the hook-shaped upper edge 11 of the upper blade 10 of the deck 9 is introduced into the hook formed by this link 4 '. The apron 9 is thus fixed to the drum T by means of one or more anti-fasteners

lifting 1.

  In the illustrated embodiment, each link 4 is advantageously able (lights 5) to be fixed on the drum T without it being necessary to modify the structure of the link. It advantageously follows that, during the assembly of the flight and taxiing, the e

  fitter can adapt the length of the anti-tie

  lifting 1, by cutting the fastener at a flexible hinge zone 3 so as to keep only the number of links 4 adapted to the rolling shutter. The anti-lift fasteners 1 can thus be mass produced, while being easily adaptable to

  length to different models of roller shutters.

  In operation, when the flight deck and wheelchair are raised to the maximum, the anti-lift part (in the initial position at rest) and the deck 9 are wound on the drum T. It is understood that in order not to obstruct at this winding, the initial radius of curvature at rest of the fastener is chosen so as to be greater than the radius of the drum T. When a user of the rolling shutter controls the rotation of the drum, for the unwinding (lowering) of the deck 9 until this apron is brought into its completely lowered position, the anti-lift attachment l is unwound from the drum T. and deformed into its locking position in FIG. 4 or 5. The abutment of the links 4.4 'of this fastener stiffens the fastener substantially in the plane of the fastener, that is to say in a substantially vertical plane. If an action is manually exerted on the apron 9 to try to raise it, knowing that the drum T is locked in rotation, the fastener l comes to oppose the winding of the apron 0, by resting on the drum T. We thus lock in

  lowered position of the roller shutter curtain 9.

Claims (6)

  1. Anti-lifting attachment (l) for rolling shutter characterized in that it consists of a plastic part, which at rest has a curved profile substantially in an arc of a circle, and in which the is provided to me ns a transverse groove (2) opening into the upper surface (lg) of the part and delimiting a flexible articulation zone (3) of smaller thickness ('), the parts of said part on either side of each groove 20 forming two rigid links (4), said part being elastically deformable in a locking position in which its links (4) are in abutment and its radius of   curvature is greater than its initial radius of curvature at rest.   2. anti-lifting attachment (l) according to claim 1 characterized in that it is planar or almost planar in its locked position. 3. anti-lifting attachment (1) according to claim 1 or 2 characterized in that each transverse groove (2) has a T-shaped profile. 4. anti-lifting attachment (l) according to one of claim l to 3 characterized in that each link (4) comprises means (5) for fixing the link on the drum of a roller shutter.   5. Anti-lifting attachment (l) according to one of claims 1 to 4   characterized in that it is obtained by molding a thermoplastic material.   6. Roller shutter comprising a rotary drum (T) and an apron (9) characterized in that the apron (9) is fixed to the drum (T) by means of one or more anti-lifting fasteners according to