FR2756000A1 - DEVICE FOR DETECTING AN OBSTACLE, HANDLING DOOR AND / OR ROLLING SHUTTER EQUIPPED WITH SUCH A DEVICE - Google Patents

Abstract

Device for detecting an obstacle (13) preventing the smooth operation of the flexible apron (2) of a handling door (1) or of a rolling shutter, characterized in that it comprises a detection cell (10) opto-electronics arranged near the winding shaft (3) of said apron, outside the winding zone of said apron. No part of the detection device is likely to come into contact with the apron, so that any risk of breakage or fatigue wear can be avoided. Application to handling doors and roller shutters.

Description

The present invention relates to a device for detecting an obstacle

  for a handling door or rolling shutter and a handling door or roller shutter equipped with a

such device.

  Detection devices are known which are designed to stop the descent and / or actuate the raising of the door or the shutter when the latter or it meets a

obstacle when descending.

  Detection devices are known which comprise one or more opto-electronic cells arranged in the uprights or slides of the door or shutter, these cells

  being able to inhibit the operation of the training system.

  shutter or door when an obstacle is in front of them. However, this or these cells are able to react only when the obstacle is directly in front of them, which results in an inaccuracy of the detection device and in possible maneuvers of the shutter or the door when

  the obstacle is located below or above the cell.

  It is also known from patent CH-A-548 523 that

  obstacle detection device in which two interferences

  breakers are located respectively above and below

  of the winding shaft of a shutter. Each interrup-

  The driver is associated with an actuating finger and a spring and is capable of acting on the drive device of the winding wheel when a soft strand bears against the finger of the winding wheel.

  one of the switches. The fingers of maneuver and the inter-

  switches are mounted in the winding area of the apron and

  may be damaged in case of misuse, in particular

  bind if a soft strand of length and heavy weight is formed before the winding or unwinding of the deck has stopped. This therefore results in a risk of deformation, or even rupture, of the operating fingers and / or switches, which

  which involves long and painful interventions.

  In addition, the switches and the operating fingers comprise moving parts which must be able to move under load, in particular under the weight of the soft strands of the shutter, so that they are likely to deform because of the fatigue of the materials used. These parts must therefore be planned robust, which increases their cost price and harms the overall economic performance

of the device.

  The invention aims to solve these problems and to propose an effective detection device, that is to say able to react whatever the position of an obstacle under the flexible apron and having no part in contact with the apron, so that there is no risk of breakage or

deformation of these parts.

  In this spirit, the invention relates to a device for detecting an obstacle preventing the operation of a flexible apron of a handling door or roller shutter, characterized in that it comprises an opto-sensor detection cell. electronic arranged near the tree

  winding of the apron, outside the winding area.

this apron.

  Thanks to the invention, no part of the detection device is likely to be in contact with the apron, so that any risk of breakage or fatigue wear can

  to be avoided. The position of the apron around its hoist shaft

  In particular, the possible formation of a soft strand is detected by the optoelectronic cell which is arranged out of the reach of the apron and is therefore not likely to be damaged. According to a first advantageous aspect of the invention, the cell is oriented to aim in a direction parallel to the winding shaft. Thanks to this aspect of the invention, the

  cell is able to react as soon as a part of the

  breaks a wave beam oriented parallel to the tree

winding.

  According to another advantageous aspect of the invention, the cell is of the transceiver type and cooperates with a reflecting device located opposite the cell outside the winding area of the apron. Thanks to this aspect of the invention, a single cell located on one side of the apron is sufficient to constitute a device for

effective detection.

  According to another advantageous aspect of the invention, it is possible for several cells to be distributed around the winding shaft, these different cells being able to detect the formation of a soft strand in different angular sectors.

  distributed around the winding shaft.

  The invention also relates to a handling door or roller shutter equipped with a detection device such as

previously described.

  The invention will be better understood and other advantages thereof will appear more clearly in the light of the

  following description of an embodiment of a

  detection device in accordance with its principle, a single

  By way of example and with reference to the accompanying drawings in which: - Figure 1 is a perspective view of a handling door equipped with a detection device according to the invention; FIG. 2 is a section along line II-II in FIG. 1 while the door is being closed and FIG. 3 is a section similar to FIG. 2 when an obstacle is present on the trajectory of the deck of FIG.

the door being closed.

  In Figure 1, a handling door 1 comprises a curtain or flexible apron 2 which can be wound around a substantially horizontal shaft 3, the shaft being rotated by an electric motor not shown. The door also comprises two lateral uprights 5 and 6 each forming a vertical slide of which only one 7 is visible in FIGS.

  and 3. A load bar 8 is disposed at the lower end.

upper deck 2.

  According to the invention, an optoelectronic cell is disposed on the upright 6 in the vicinity of the winding shaft 3, outside the winding zone of the winding shaft.

apron 2.

  Thus, the cell 10 is protected against the movements of the apron 2. The cell is oriented towards a reflecting device 11 disposed on the upright 5 facing the cell 10 and outside the apron winding area 2. Reflective device 11 is also out

  of the apron 2. The cell 10 is of the transmitting type

  receiver, so that it emits in the direction of the reflecting device 11 a beam F of light rays, infrared, ultraviolet or any other suitable type, which it captures the return after it has been returned by the device 11. The operation of the detection device appears by comparing FIGS. 2 and 3. In these figures, the apron has

  has been shown in an external view for the sake of clarity.

  In the position of Figure 2, when the apron 2 is

  rolled out so as to close door 1 and in the absence of

  key, no part of the apron 2 passes in front of the cell 10,

  so that the beam F is not likely to be interrupted.

  On the contrary, if an obstacle 13 is on the

  2, the load bar 8 comes into contact with the latter, as shown in FIG. 3, so that, as the shaft 3 rotates counterclockwise, a soft strand 2a of the apron 2 develops to the point that it passes the active part of the cell 10 and that the beam F is interrupted, this being detected by the

  cell 10. The latter is then able to inhibit the function

  of the operating system of the shaft 3, or even to control a rotation in opposite direction in order to raise at least

partially the apron 2.

  Note that the detection device of the invention is effective regardless of the height of the obstacle 13, which is a significant advance compared to devices provided with an opto-electronic cell disposed in or near a 7. Moreover, since no mechanical part can be moved by the deck 2, it is not necessary to provide a protective cover to isolate such a room with respect to the ambient atmosphere, particularly when the door is installed inside an industrial space. Indeed, the cell 10 and the reflecting device 11 are able to operate in any atmosphere and do not see their characteristics.

  altered by a deposit of dust.

  According to an advantageous variant of the invention, provision may be made for the device to comprise several cells distributed around the winding shaft, as appears with the cells 10 'and 10 "shown in phantom in FIG. 10 'and 10 "cooperate with the cell 10 to detect the formation of a soft strand equivalent to the soft strand 2a in different angular sectors around the shaft 3, so that the device is able to react as soon as the formation of a soft strand and without waiting for it to develop significantly to the point of passing a cell disposed in a particular angular sector. This helps to improve the

  response time of the detection device of the invention.

  A handling door or roller shutter equipped with a detection device according to the invention is therefore safe insofar as it or it comprises a device capable of reacting whatever the height of the obstacle 13 and which does not risk not to be damaged by a shock due to the apron during winding or wear parts in contact with this apron.

Claims (5)

  1. Device for detecting an obstacle (13) preventing the operation of a flexible apron (2) of a handling door (1) or a shutter, characterized in that it comprises a cell opto-electronic detection device (10) arranged near the winding shaft (3) of said   apron, outside the winding zone of said apron.   2. Detection device according to claim 1, characterized in that said cell (10) is oriented to aim in a direction parallel to said winding shaft (3). 3. Detection device according to claim 2,   characterized in that said cell is of the transmitter-type   receiver and cooperates with a reflecting device (11) located opposite said cell (10), outside the   winding area of said apron (2).   4. Detection device according to one of the claims   1 to 3, characterized in that it comprises several cells (10,   ', 10 ") distributed around said winding shaft.   5. Handling door (1) or rolling shutter equipped with a   detection device according to one of the preceding claims. Slots.