FR2679431A1 - Winding cylinder for a curtain - Google Patents

Abstract

Winding cylinder for a curtain, in which the first collar wall (11) has a recess (16) with a partial radial surface (18) extending as far as the perimeter (17), said partial surface being located, with respect to the second collar wall (13), at a greater axial distance (19) than the internal radial surface (20) of the first collar wall (11), said surface being situated after the recess (16), after which the radial slot (26) is formed in this partial surface (18).

Description

i The present invention relates to a roller cylinder for a curtain provided

  a coaxial wall sliding on a winding shaft, a first wall of radial flange and a second wall of radial flange located at a first axial distance from the first, the latter having an open radial slot facing the periphery and intended for the reversible engagement of a stop device connected to one end of a first rollable pulling element

  between the first and the second flange wall.

  A winding cylinder of this type is known in particular from patent DE-Gm 89 07 957 The stop device is a disc in the form of a dumbbell equipped with an annular groove the bottom of which represents a body of

  cylinder which can be engaged in the radial slot.

  Parts of the disc on both sides of the body

  of the cylinder then encroach, inside and outside

  térieur, on the wall of the collar A pulling element (a drawstring) is passed through a hole

  central in the disc and held in place by the

  medial of a knot When the winding cylinder rotates, the pulling cord is wound or unwound in the winding space extending between the walls

  of the collar, which causes the movement of the curtain.

  However, when approaching too close to the first flange wall, the part of the pulling cord which moves away from the winding cylinder risks catching on

  the part of the disc protruding into the winding space

  It is true that the outer sides of the disc are rounded towards the circumference, but a weakly disc

snapped in could loosen.

  Another drawback appears, when you want to use a flat pulling ribbon. The pulling ribbon must be wound layer on layer as clearly as possible, it is guided between the flange walls with little play. In this case (for example EP O 118 700 A 3), no stop device is used, but the pulling tape is passed directly through the radial slit while holding it with a knot A curtain

  in front, from time to time, be removed for cleaning

  toyage, it is preferable that the pull ribbons can be simply separated from the winding cylinder instead of having to be pulled out of the numerous guide loops of the curtain. In this case, it is also essential to allow a non-specialist to reinstall the pull ribbons, which is not enough the case in the examples of realization

known so far.

  The object of the invention is to create a winding cylinder of the generic type, equipped with any drawing element (cord or ribbon) fixed indirectly and removably in the presence of a device.

  stop and can be rolled up easily.

  This objective is achieved by the fact that the first flange wall has a niche provided with a

  partial radial surface and extending to the periphery

  rie, said partial surface being disposed, relative to the second flange wall, at an axial distance greater than the radial inner surface of the first flange wall, said surface being located after the recess, then the radial slot is formed

  at this partial surface.

  The niche in the collar wall accommodates

  here the part of the stop device which, in the examples

  ples of known embodiment, is projecting in the winding space The stop device and the pulling element no longer interact, whatever the type of the latter It is thus possible, in particular, to fix a tape drawing using a stopper This has the advantage that the same principle of fixing can be used for the cord and the ribbon, which avoids non-specialists who may have different types of curtains in their apartment, to become familiar with the mechanism of each of them The use of a

  stop device creates, on the one hand, a means of orient-

  tation evident with regard to the type of fixing and, on the other hand, results in a clearly sensitive and audible click-in, signaling the correct position and avoiding any error. It should not be forgotten, in fact, that rewind cylinders are always installed in -high,

  under the ceiling, and the installation of the curtain

  often, not on sight, but on impression

  and, thanks to the invention, according to 1 oule.

  In accordance with an evolved embodiment, a third flange wall is provided at a

  second axial distance from the second neck wall

  lerette, this third flange wall being provided with a radial slot open facing the periphery for the reversible engagement of a stop device connected to the end of a second pulling element that can be rolled up between the second and the third flange wall; the universal character with regard to the drawing element used is improved by the formation of two winding spaces whose axial extent can be optimally adapted to the drawing element used, on the one hand , because the first axial distance is less than the second and, on the other

  part, because the second axial distance is appro-

  ximply twice as large as the first A pulling ribbon must thus be guided between relatively close flange walls along the axis, whereas it is desirable that, for a pulling cord, as many layers as possible can be arranged

  one next to the other along the axis.

  Therefore, when two winding spaces

  are separated, it is useful to install not only the stop device for the first pulling element (pulling tape), but also that for the second (pulling cord) sheltered in a niche which is provided with a radial partial surface extending to the periphery and located, relative to the second flange wall, at an axial distance greater than the radial interior surface of the third flange wall, which wall being located after of the recess and in that the radial slot is formed at this partial surface. Various other features of the invention

  moreover emerge from the detailed description which

follows.

  An embodiment of the object of the invention

  tion is shown, by way of nonlimiting example,

in the attached drawing.

  Fig 1, a side elevation of a cylinder

  reel according to the invention, in, approximate-

ment, a double enlargement.

  Fig 2, a section along the section plane

2-2 in fig 1.

  Fig 3, a top view of a stop device. Fig 4, a side elevation of the device

according to fig 3.

  The winding cylinder according to fig 1 is composed of a cylindrical wall 10, the left end of which is bounded by a first wall of radial flange 11 (in the form of a disc) A second wall of radial flange 13 (in the form of a disc) is at a first axial distance 12 relative to the first wall 11, followed by a third wall of radial flange 14

  (disc-shaped) at a second axial distance 15.

  Consequently, the flange walls 11 and 13 delimit a winding space with cross-sectional dimensions of approximately 6 x 8 mm and suitable for a ribbon.

  about 5 mm wide.

  The flange walls 13 and 14 define a winding space with dimensions in cross section

  about 15 x 8 mm and suitable for a pull cord.

  The inside diameter of the cylinder wall 10 is approximately 4 mm, allowing the use of a winding shaft, not shown. Examples of known embodiments of elements of the winding cylinder allowing it to be held in a non- rotatable and fixed along the axis on the winding shaft, are not shown either. The first flange wall 11 is continuously presented in the form of a flat disc, with the exception of the niche 16 explained in detail below. This niche has a partial radial surface 18 and extending to the periphery 17 of the flange wall 11, which partial surface is located, relative to the second flange wall 13, at an axial distance 19 greater than the distance 12 between the interior surface 20

  located after niche 16 and the second adhesive wall-

  rette 13 The partial surface 18 is therefore offset parallel to the left with respect to the surface

interior 20.

  The recess 16 could be in the form of a flat recess in the wall of the collar, visible from one side only. However, the example shows a collar wall 11 provided with a shoulder 21 projecting from

  the outer surface 22 of the flange wall 11.

  Therefore, it is possible to continuously manufacture a substantially identical wall thickness, which

  represents a saving in weight and material.

  Seen in the direction of the circumference, the partial surface 18 has a width 23 of approximately 11 mm and a radial height of approximately 10 mm In this regard, it should be noted that the wall of the cylinder 10 has, at the level of the niche 16, an approximately rectangular hollow 24 and that, consequently, the partial surface 18 is, along the axis, continuously flat up to the inner edge 25 of the cylinder wall 10 Its radial height thus corresponds to the radial height of the first flange wall 11 between the interior wall

and the periphery 17.

  The difference between the distances 12 and 19 corresponds to the (axial) depth of the niche 16, the recess 24 having an identical axial dimension In

  the example, the difference is about 1.5 mm.

  As shown in FIG. 2, a radial slot 26 open facing the periphery is located in the partial surface 18, the shape of said slot making it possible, in known manner, to snap into it the stop device 27 described below If this one is, in fact, known (DE-Gm 89 07 957), it is nevertheless briefly presented here for a better understanding of its coordination with

the niche.

  As shown in Figs 3 and 4, the device

  stop 27 is in the form of a circular disc

  laire provided with an annular groove 28 whose inner surfaces 29, 30 arranged face to face are parallel to the plane of the disc and at a distance 31, relative to each other, slightly greater than the thickness of the wall 32 at the level of the partial surface 18 of the niche 16 (fig 1) The bottom of the groove forms a body of

  cylinder 33 whose diameter corresponds to the interior area

  radial of the radial slot 26 The outer diameter 34 of the stopper 27 and slightly less than the width 23 and the height of the surface

partial 18.

  The engagement of the stop device 27 in the radial slot 26 causes the following situation. The central zone with the cylinder body 33 is snapped into the radial slot 26 by exploiting the elasticity of the materials, since at least the device stop is made of plastic The parts of the disc, 36 (fig 4) remaining on both sides of the cylinder body 33 surround the shoulder 21 so that the inner surface 30 of the annular groove 28 has a loose adhesion by relative to the partial surface 18, while the inner surface 29 adheres to the outer surface of the shoulder 21, which

  surface being located opposite the partial surface 18.

  The part of the disc 35 enters the recess 24 allowing the center provided with a through hole 37 to be brought closer to the wall of the cylinder 10 The pulling element (not shown) has been previously passed through the hole 37 and held in place with a knot In the example embodiment above, the pulling element

  crosses the first flange wall 11 approximately

  in the middle of its height.

  It is also possible to remove the recess 24 However, in this case, the diameter 34 of the stop device 27 must be reduced, which makes the introduction of the stop device a little more difficult. However, the recess 24 also facilitates manufacturing, for example during the injection molding of the winding cylinder It is indeed possible to simply introduce, into the injection mold, a slide of width 23 radially up to the inner edge 25, so that that said slide bears directly on the mandrel

  central provided for the wall of the cylinder 10.

  It follows from the above description that

  the axial thickness of the parts of the disc 35, 36 is slightly less than the axial depth of the recess 16 Consequently, in the operating state, the part of the disc 35 does not exceed the internal surface 20 of the first flange wall 11 It is therefore possible to guide, without problems, a pulling ribbon with little play between the first and second flange walls 11, 13, to wind it and, nevertheless, to fix it in the

  radial slot 26 using the stop device 27.

  A winding cylinder designed exclusively for a pulling tape could stop on the right following the

  second flange wall 13 completely flat.

  However, this exemplary embodiment also provides for the optional use of a pulling cord for which an axially longer winding space is useful. As has been described above for the pulling ribbon, the pulling cord is engaged. in the third flange wall 14 using the stop device 27 A draw cord being more flexible and able to deviate more easily, including in the axial direction, the necessary radial slot could be formed in the usual way (DE -Gm 89 07 957)

  in a third continuous flange wall.

  However, a higher degree of security is achieved by housing the stop device 27 also sheltered in a niche 38 This niche is preferably arranged symmetrically with respect to the niche 16 described above, only the shoulder 39 corresponding and indicated in fig 1 projecting to the right For the rest, this embodiment is identical to

the one described above.

  A winding cylinder designed exclusively for a draw cord could stop to the left following the second flange wall 13. Or, which amounts to the same thing, only the first and second flange walls 11, 13 are provided for. placing, however, at

greater axial distance.

Claims (7)

  1 Roller cylinder for a curtain, provided with a coaxial wall which can be slid on a winding shaft, a first wall of radial flange and a second wall of radial flange situated at a first axial distance from the first, the latter having a radial slot open facing the periphery and intended for the reversible engagement of a stop device connected to one end of a first pulling element which can be rolled up between the first and second flange walls, characterized in that the first flange wall (11) has a recess (16) provided with a radial partial surface (18) and extending to the periphery (17), said partial surface being arranged, relative to the second flange wall (13), at one   axial distance (19) greater than the internal surface   radial (20) of the first flange wall (11), said surface being located following the niche (16), then the radial slot (26) is formed at this partial surface (18).   2 reel cylinder according to claim 1, characterized in that a third flange wall (14) is provided at a second axial distance (15) from the second flange wall (13), this third flange wall (14) being fitted with a radial slot   open facing the periphery (17) for the enclosure   reversible connection of a stop device connected to the   remitted of a second pulling element which can be rolled up between   the second and third flange walls.   3 reel cylinder according to claim 2, characterized in that the third flange wall   (14) has a niche (38) provided with a partial surface-   the radial going to the periphery and located, relative to the second flange wall (13), at an axial distance greater than the inner surface   radial of the third flange wall (14), which   the wall being located after the niche (38) and in that the radial slot is formed at this partial surface.   4 Rewinder cylinder according to one of the claims   1 or 3, characterized in that the width (23) of the partial surface (18) is, viewed in the direction of the circumference, approximately equal to the height radial of this surface.   Rewinder cylinder according to claim 4, characterized in that the radial height of the partial surface (18) is approximately equal to the height   radial of the flange wall (11, 14).   6 Rewinder cylinder according to one of the claims   1 or 3, characterized in that the wall of the coaxial cylinder (10) has, at the level of the niche (16, 38), a hollow (24) whose width, seen in the direction of the circumference, corresponds approximately to the width (23) of the partial surface (18) and which extends in the axial direction at least from the partial surface (18) of the niche to the interior surface (20) of the wall of   flange (11, 14), located after the niche.   7 Rewinder cylinder according to one of the claims   1 and 2, characterized in that the first distance   axial (12) is less than the second (15).   8 take-up roller according to claim 7, characterized in that the second axial distance (15) is approximately twice greater than the first (12).