FR2780438A1 - Multipurpose shaft for roller shutter door - Google Patents

Abstract

The shaft is cylindrical and at least partially hollow drum (1) with an inner surface profile of non-constant radius and a tip carrying a spindle fitted to each end. Each tip is in the form of a sleeve (5) inserted into the end of the drum and having an outer surface profile matching that of the drum's inner surface so that it is locked in place when inserted and does not rotate relative to the shaft. The shaft can be made from a light alloy, aluminum, composition material or plastic.

Description

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  The term handling doors means doors installed in factories, warehouses, hangars, stores, etc. to allow communication and ensure isolation for temperature and noise, between different volumes or vis-à-vis the outside. In general, they must be able to be opened and closed quickly, by clearing or closing a bay formed in a wall, to allow the passage of vehicles, and limit the duration of opening during which isolation

is no longer insured.

  These doors include a curtain which can be rolled up or folded up at the top or on either side of the opening, the curtain generally being able to be a flexible sheet, or to be formed from hinged panels. A rotary shaft is arranged for example above the opening, to wind the curtain, or curtain lifting straps. The curtain is generally reinforced by at least one rigid bar, the ends of which slide with the edges of the curtain in vertical slides (possibly

horizontal).

  The present invention relates to a tree

  curtain or strap winding for this kind of door.

  Some known trees are made from a steel tube on which is fixed a flat or a rod to hang, the curtain or the straps. There are also known shafts consisting of two extruded halves joined to an axis by bolts. The transmission of the operating forces causes high stresses which can

cause ruptures.

  The subject of the invention is a multifunctional tree of simpler and more economical production, while

  with superior rigidity and strength.

  According to the invention, a winding shaft for a handling door comprising a winding drum with a nozzle at each end, is characterized in that the drum has a shape which allows it to be obtained by extrusion. According to an important characteristic, the shape of the drum is adapted to receive inside each end a nozzle having an axis and a sleeve which makes it possible to transmit the force from the axis of the nozzle to the

periphery of the drum.

  Advantageously, the drum includes a cannula for the

  attachment of a flexible sheet or straps.

  The drum is made of a material chosen from the group comprising light alloys, aluminum,

  composites and plastics.

  Other characteristics and advantages of the invention

  will appear during the description which follows,

  given by way of nonlimiting example with regard to the attached drawings, and which will make it clear how the invention

can be done.

  In the drawings: - Figure 1 is a sectional view, along the line I- I of Figure 3, of a multifunction winding shaft, for a door according to the invention, - Figure 2 is a view perspective of a tip consisting of a sleeve and an axis, - Figure 2A is a perspective view of a tip axis and Figure 2B is a perspective view of a tip sleeve, and - Figure 3 is an elevational view of a complete shaft with schematic indication of the bearings and a counterweight. The tree according to the present invention consists of a

  winding drum with a tip at each end.

  Figure 1 shows a section of the winding drum part 1. The drum is obtained by extrusion. It has a generally round shape, which can here be slightly flattened to ensure better elastic hold on

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  sleeves. According to a characteristic of the invention, the shaft is extruded with a cannula 2 which is a groove whose edges are close together. This makes it possible to attach a curtain or straps, provided with a thickened edge or even using a rod, and, in all cases, without forming any additional thickness, by introducing a fold in the cannula, then by threading the rod into the fold. The thickened edge or the rod has a diameter greater than the narrowed width of the cannula. Preferably, the rod with the thickness of the curtain or the strap fills the volume of the cannula. The drum can be made of any extrudable material: aluminum, light alloy, composite, plastic for example, depending on the desired strength, depending on the range of the door, its height, the weight of the fabric, any bars of reinforcement, etc. An advantage of extrusion manufacturing, apart from the possibility of obtaining any desired section, with the fixing cannula, resides in the fact that the most common extrudable materials are

  insensitive to corrosion and do not require painting.

  It will be noted that the profile has recessed parts lA, which increases the rigidity of the shaft, and appreciably improves the connection of the sleeves on the drum to improve the transmission of forces from the axis of the end pieces

the periphery of the drum.

  We can realize in the same way a load bar

for the lower edge of the curtain.

  To make the shaft, a tip 63 is engaged at each end of the drum 1, such as that shown in FIG. 2. This tip consists of an axis 4 (fig. 2B) and a sleeve 5 (fig. 2A). In a method of manufacturing the end piece, the end piece can be obtained by overmolding the sleeve, for example aluminum, in a mold in which protrudes an end of the axis, for example steel.

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  Axis 4 can be obtained from a hexagonal or square rod, part of which is bored along the length

  desired which can be different at one end and at the other.

  The part of the axis embedded in the sleeve remains hexagonal (or other polygonal section). A groove 6 is provided in the vicinity of the embedded end to prevent any extraction of the axis and a groove 7 is provided in the vicinity of the other end to receive a key. In this process, the sleeve, as shown

  in FIG. 2B cannot be without an axis (fig. 2A).

  But we can of course manufacture the sleeve separately and

the axis, and then assemble them.

  Figure 3 shows a complete tree. The drum 1 with the sleeves 5 and the axes 4 is carried to the right by the gear motor of which only a fragment 7 is shown and to the left by a bearing 8 provided with a ball bearing. The landing is carried by the door frame: upright, cross member or console. The axis on the bearing side is extended and carries a winding drum 9, a strap 10, a support, a counterweight 1. A roller 12 ensures the placement

constant counterweight correct.

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Claims (6)

Claims:   1.- Multifunctional winding shaft for handling door comprising a winding drum with a nozzle at each end, characterized in that the drum   (1) has a shape which allows it to be obtained by extrusion.   2.- shaft according to claim 1, characterized in that the drum comprises a cannula (2) for fixing a flexible sheet or straps.   3.- Tree according to one of claims 1 or 2,   characterized in that the drum section has sunken parts (1A).   4.- Tree according to any one of the claims   above, characterized in that the drum (1) consists of a material chosen from the group comprising light alloys, aluminum, composites and plastics.   5.- Tree according to any one of the claims   previous, characterized in that the shape of the drum (1) is adapted to receive inside each end an end piece (3) comprising an axis (4) and a sleeve (5) which allows the force to be transmitted from the tip axis at the periphery of the drum.   6.- Shaft according to claim 5, characterized in that each end piece (3) is constituted by a sleeve (5) overmolded on an axis (4) * * *