FR2673231A1 - DRIVE DEVICE FOR VENETIAN BLINDS. - Google Patents

Abstract

Drive device for a Venetian blind comprising a box (1) in which pulleys (8, 9, 10) are mounted, each rotatably mounted in a cradle (11, 12, 13). The motor (5) is a tubular motor mounted inside the drive shaft (4). This shaft is supported at its ends and at least the intermediate cradle (11) is mounted floating in the box. This assembly makes it possible to ensure the alignment of the axes of the pulleys on the axis of the drive shaft.

Description

The subject of the present invention is a device for

  track for venetian blind comprising a box

  open downwards in which a motor is mounted

  dragging, via a speed reducer

  tesse, a drive shaft on which are mounted two pulleys located near the ends of the box and at least one intermediate pulley, pulleys intended for winding the facets of the blind and for opening

  its blades, each of these pulleys being rotatably mounted

in a cradle.

  In the drive devices known and used to date, the motor, equipped with its reduction gear, and fixed

  rigidly at the bottom of the box, at an intermediate point

  diary between the ends of the box and has two drive shafts on which are mounted the

  pulleys with cradles rigidly attached to the rails

  kings of the box by means of screws In such an execution-

  tion, where several independent elements are fixed in-

  dividually and rigidly, it is difficult to assure

  rer a correct alignment of the drive shafts and

  of the pulley axes Alignment errors are caused

  duce by vibrations which are transmitted by all

  the elements in the box, giving rise to significant noise

so much.

  The object of the present invention is to provide a

  training device for venetian blinds obviating the above-mentioned drawbacks, that is to say silent,

  easy to make and install.

  The drive device according to the invention is

  characterized in that the motor is a tubular motor mounted inside said drive shaft and whose head is rigidly connected to the box, that said drive shaft is supported at its ends and that at least the intermediate cradle is mounted floating

in the box.

  The intermediate cradle, respectively the intermediate cradles, being mounted floating in the box, the axis of their pulley is automatically aligned with the axis of the drive shaft. The use of a tubular motor makes it possible to have a unique drive shaft with large cross-section These characteristics help to suppress vibrations and make the device

silent drive.

  The appended drawing represents, by way of non-limiting example

  mitative, two embodiments of the device according to the invention. Figure 1 is an axial sectional view along I-I of Figure 2 of a first embodiment shown

partly schematically.

  Figure 2 is a cross-sectional view along

II-II of Figure 1.

  Figure 3 is an axial sectional view along III-III

  of FIG. 4 of a second embodiment, represented by

partly felt schematically.

  Figure 4 is a cross-sectional view along

IV-IV of figure 3.

  Figure 5 is a more precise axial half-view of

  the end of the device according to the second form of exe

  cution, front wall of the casing removed.

  Figure 6 is a partial sectional view along VI-VI

in Figure 5.

  The device shown in Figures 1 and 2 comprises a metal box 1 formed of a rectangular profile open downwards and two end flanges 2

  and 3 The drive shaft 4 is tubular and sec-

  hexagonal tion Inside the shaft 4 is mounted a tubular motor 5 associated with a reduction gear, motor

  the head 6 of which is rigidly fixed to the flange 3, tan-

  say that the end 7 of the drive shaft 4 is

  journalled in the flange 2 which serves as its bearing.

  The drive shaft 4 crosses two end pulleys

  mite 8 and 9 and an intermediate pulley 10 which are

  of course integral in rotation with the shaft 4 Cha-

  one of these pulleys has a central groove for winding the Venetian blind facets and two

  lateral grooves for driving ladders intended for

  born at the orientation of the blind blades The pulleys 8, 9 and 10 are rotatably mounted respectively in a cradle 11, 12 and 13 shown diagrammatically These cradles are mounted floating in the box 1 in the vertical direction For this purpose, each cradle has

  two lateral tenons 14 and 15 engaged with a green play

  tical in cutouts 16 and 17 of box 1.

  The position of the drive shaft 4 is determined by the end flanges 2 and 3 The cradles 11,

  12 and 13 being floating, the pulleys 8, 9 and 10 can

  wind will automatically align with the drive shaft

  This form of execution is interesting in that

  that it allows easy reporting of the tree of

  motorized drag The blind can therefore be pre-assembled

and even pre-installed.

  The second embodiment, shown in Figures 3 and 4, differs from the first embodiment in that the drive shaft 4 is supported by the end cradles 11 and 12 instead of being supported by the end flanges 18 and 19, these flanges

  can therefore be carried out more slowly

  manages and fixed to the box by simple interlocking.

  The cradles 11 and 12 are therefore fixed rigid-

  ment to the side walls of the box 1, preferably by interlocking without a set of split pins 20 and 21, the two arms of which are automatically hooked in known manner on the outside face of the box. The intermediate cradle 13 is on the other hand mounted floating as in the first form of execution It would be

  likewise other intermediate cradles.

  The head 6 of the engine is rigidly fixed to an intermediate support 22 which is rigidly fixed to the cradle

  12 The end 7 of the drive shaft is therefore

  analogous lesson, journalled in an intermediate support

  re 23 rigidly fixed to the cradle 11.

  As this is shown more precisely in FIGS. 5 and 6, the intermediate support 22 has a shape adapted to the head 6 of the engine and partially enveloping this head The head 6 of the engine is fixed

  to part 22 by two screws such as screw 24, the support

  port 22 being itself fixed to the cradle 12 by three

  ears such as 25 and 26 with a hole through the

  which they are engaged on pins 27 of the cradle

  12 on which they are held by clips.

Claims (3)

CLAIMS.   1 drive device for venetian blind   taking a box (1) open downwards in which is mounted a motor driving, by means of a speed reducer, a drive shaft (4) on which are mounted two pulleys (8, 9) located near of the ends of the box and at least one intermediate pulley (10), pulleys intended for winding the laces of the blind and for the orientation of its blades, each of these pulleys being rotatably mounted in   a cradle (11, 12, 13), characterized in that the mo-   tor (5) is a tubular motor mounted inside said drive shaft 4 and whose head (6) is   rigidly connected to the box, that said drive shaft   nement (4) is supported at its ends and that at least the intermediate cradle (13) is mounted floating in the box.   2 drive device according to claim 1, wherein the box is closed by flanges (2, 3) at its ends, characterized in that the tubular motor and the drive shaft are carried by the end flanges and that all the cradles (11, 12,   13) are mounted floating in the box.   3 Drive device according to claim 1, characterized in that the cradles (11, 12) located near the ends of the box are rigidly fixed to the box, that the head (6) of the motor is rigidly fixed to an intermediate element (22 ) itself rigidly linked   to one of the end cradles and that the end op-   of the drive shaft is supported by a   link (23) rigidly connected to the other end cradle.