LU85000A1 - AUTOMATIC GATE, PARTICULARLY FOR AN ENTRY PASS IN A SALES AREA - Google Patents

Abstract

What is proposed is an automatic door, such as a trellis door, entry barrier or the like, especially as an access door to a sales area, for example in a supermarket, which has a horizontal arm (16) connected fixedly in terms of rotation to a vertical shaft (14), the shaft (14) being rotatable by a motor (M). An electromagnetically controlled braking device (20, 22) prevents a rotation of the shaft (14) when the motor (M) is not supplied with current and allows a rotation of the shaft (14) when the motor (M) receives current. <IMAGE>

Description

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Automatic gate, in particular for entering the sales area.

The invention relates to an automatic gate, intended to be installed in particular in an entrance passageway or passageway in a sales area, to open automatically when a person arrives at the entrance to this passageway 5 and to close again. then automatically to block the way ^ or the entry pastidger and prohibit the exit by this way.

A portïmôrFâe this type generally comprises a horizontal part suitable for being driven in rotation about a vertical axis 10 about a quarter of a turn, for example by an electric motor controlled by a photocell circuit.

According to the regulations in force, such a gate must also be able to open from its closed position in order to let people out quickly when necessary.

For this purpose, the pivoting horizontal part of the gate 20 is generally connected to a vertical drive shaft by a mechanical spring stop which opposes the opening in the opposite direction of the gate as long as the thrust exerted on this | horizontal part remains below a predetermined-mined value which is adjustable mechanically, by means of screws or 2 i j analogues.

It has often been found that this spring stop is adjusted to provide maximum resistance to the opening in the opposite direction of the door, in order to prevent people from going out, voluntarily or involuntarily, by this route. In this

Icas, when a person nevertheless tries to open the door in the opposite direction to exit, he exerts a significant thrust on the pivoting part of the door, which is transmitted by the spring stop to the motor shaft with an amplification determined by the length of the lever arm between its point of application on the gate and the drive shaft, as long as said spring stop opposes opening, which can lead to rapid deterioration or destruction of the gate.

The object of the invention is in particular to avoid these drawbacks, while improving the safety conditions for people or customers in a sales area.

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It offers for this purpose ^^ hf ^ ô | rtillon automatic, intended in particular to be installed in an entry way of a sales area, comprising-a substantially horizontal arm integral in rotation with a vertical shaft supported in rotation 25 by a vertical upright or pillar, an electric motor for driving this shaft in rotation, and motor control means automatically triggered by the passage of a person and / or a cart entering the sales area by said path, characterized in that the motor control means 30 also control means for braking said vertical shaft so that, when the motor is rotated, the braking force of said shaft developed by these means is substantially zero and, when the engine is stopped by the control means, this braking force is equal to a predetermined value.

/ v / Thus, according to the invention, when the gate is at rest  3 in its closed position of an entrance way into a:] sales area, a determined braking force is î constantly exerted on the vertical gate motor shaft

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; ] and is canceled as soon as the gate drive motor

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j 5 is excited to open the gate in the normal direction of entry, which allows a person to enter the sales area J. Conversely, when a person tries to exit by a path equipped with such a gate, it suffices for him to exert on the pivoting part of the gate a push 10 sufficient to overcome the braking force applied to said shaft by the braking means. . This thrust is absorbed by the braking means and not by the support of the gate.

Advantageously, the braking means are constituted by an electrically or electromagnetically controlled brake, this brake being applied to the vertical shaft when its control means are energized and being released when its control means are de-energized. The brake may consist of a friction disc secured to the vertical shaft, of which the arm of the gate intended to block the passageway is also rotationally attached, and by another friction disc fixed to rotation, the two discs 'being applied one on the other with a force predetermined by electromagnetic means for the application of the brake, so that the rotation of the vertical shaft for the opening in seno [reverse of the gate n' is not fully transmitted to the support of the vertical shaft.

Advantageously, a device of the same type, forming torque limiter, can be interposed between the vertical shaft and the output shaft of the drive motor.

In the description which follows, given by way of example, reference is made to the appended drawings, in which: FIG. 1 is a schematic elevation view of a gate according to the invention; Figure 4 is a sectional view along line II-II of Figure 1, showing a circular disc associated with | ; photoelectric cells; LJ: '· 5 Figure 3 schematically shows the control circuit j of the gate of Figure 1.

J The gate shown in the drawing includes a pillar or mon- I; . both vertical 10, fixed to the ground, which supports in rotation, at I *! i 10 by means of bearings 12, a vertical shaft 14. A horizontal arm 16 is mounted integral in rotation with the upper end of the shaft 14. L the lower end of this shaft is connected, for example by a device 18 forming a torque limiter, to the output shaft of an electric motor M or of a geared motor unit, carried by the vertical upright 10.

A shaft 14 is associated with a braking device, for example with electromagnetic control, comprising a movable armature 20 integral in rotation with the shaft 14 and an electromagnet 20 22% pierced by the mon% àh'C 10 and freely traversed by 'the shaft 14. The faeëspifl look of the movable armature 20 and the electromagnet include friction linings. When the electromagnet 22 is energized, it attracts the movable armature 20 and the friction linings of these two elements 25 are applied to each other with a predetermined force for applying the brake. When the electromagnet is not energized, the force of application of the friction linings to one another is zero, the brake is released and does not oppose the rotation of the shaft 14.

The use of such an electromagnetically controlled brake makes it possible by construction to adjust the braking force opposing the rotation of the shaft 14 when the brake is applied to a value in accordance with the regulations in force. It is therefore difficult or impossible for the maintenance staff / a sales area to modify this preset value.

5 The shaft 14 is also secured to a thin circular disc 24 which includes a rectangular cutout or notch: J 26 at its periphery (FIG. 2), this notch being intended; i to be brought in, by rotation of the shaft 14 , next to this- | 5 Photoelectric cells ç2 and c3 whose emitter-receiver pairs are arranged for example on either side of the disc 24. Another photoelectric cell jçl (not shown in FIGS. 1 and 2) is placed a little upstream of the gate with respect to the normal direction of passage through this gate for entry into a sales area, so as to: i control the automatic opening of the gate when it is triggered by the passage of a person or a cart about to enter the sales area.

15 The normal direction of rotation of the shaft 14, for opening the gate from its closed or barring position of an inlet channel, is represented in FIG. 2 by the arrow 28. In this case, the gate opens to the left for entry into the sales area. The cell ç2 is posi-20 angularly finished- ^ oar with respect to the axis of the vertical shaft 14 so that -Télie is next to the cutout | 26 when the por t ilion · is in its closed or blocked position of the entry route. The cell ç3 is arranged in an angular position such that it is opposite 25 of the cutout or notch 26 of the disc 24 when the shaft 14 has rotated by approximately 90 ° or by an angle slightly less than 90 °, in the normal direction of rotation indicated by arrow 28, from its position corresponding to the closing of the inlet channel.

30

As shown diagrammatically in FIG. 3, the outputs of cells cl, ç2, ç3 are connected to inputs of a signal processing circuit C, the outputs of which are connected to motor control means or gearmotor group M and to means for controlling the application and release of the brake 20, 22.

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This gate works in the following way: i i We first assume that it is at rest, in its position of closing an entry way into a surface of! 5 sale. In this position, the motor or geared motor unit I is not supplied, the electromagnet 22 of the brake j is excited so that this brake is applied and opposes the rotation of the shaft 14, and the notch or cut 26 of the disc '24 secured to the shaft 14 is opposite the cell c.2.

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When, under these conditions, a person approaches the gate to enter the sales area, his arrival is detected by the cell cl, placed upstream of the gate, which produces a significant signal transmitted to circuit C. This circuit, on the one hand, then cuts off the excitation of the electromagnet 22 of the brake, so that the brake is released, and, on the other hand, controls the supply of the motor M so that the shaft 14 is driven in rotation in the direction of the arrow 28 until the notch or cutout 26 of the disqÜÊi'24 is brought opposite the cell c3. This cell then predicts a significant signal received by the circuit • C which controls, on the one hand, the excitation of the electromagnet 22 of the brake for the application of the brake and, on the other hand, cuts the power supply to motor M.

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A time delay, controlled by circuit C, allows after a few seconds to cut the excitation of the electromagnet 22 of the brake to release this brake, and to power the motor M so as to rotate the shaft 14 in the direction 30 opposite to the direction of the arrow 28, until the cutout 26 of the disc 24 is brought back opposite the cell ç2. The engine is then stopped and the brake is applied.

If a person appears in front of the gate to enter the sales area when it is still in its / open position, the time delay is again validated by the cell cl and the circuit C and the gate is not oar- 7 t

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t | born in the closed position by the motor M only after a lapse - | in the order of a few seconds.

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When the gate is in its closed position! 5 entry way and that a person in the sales area J tries to exit by this way by pulling or pushing the arm 16 so as to rotate the shaft 14 in I! . v · it the direction of the arrow 28 or in the opposite direction, the rotation j of the shaft 14 occurs only if the traction or the push 10 exerted on the horizontal arm 16 is sufficiently important to overcome the resistant force produced by applying the elements 20 and 22 of the brake to each other. When this rotation occurs, the cutout or notch 26 of the disc 24 is moved beyond the cell ç2, which produces a signal 15 transmitted to circuit C. This circuit then commands the triggering of an alarm A.

It will be noted that, in the event of a fire in a store, the fire detectors automatically cut off the general electrical supply of the store, which results in “the de-excitation of the electromagnets 22 of the door brakes and therefore by an easy-opening of these doors, allowing a quick exit of people in the store.

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The torque limiter 18 interposed between the output shaft of the engine M and the vertical shaft 14 of the gate essentially makes it possible to avoid deterioration of the engine M. when, for whatever reason, the horizontal arm 16 of the gate 30 is blocked between its open position and its closed position.

A gate according to the invention can also be equipped with a combination mechanism, controlled for example by a 3F, key, or a push-button, making it possible, by displaying the combination, to cut the excitation of the electro -magnet of the JP brake, for releasing this brake, and supplying the Λ- 8 "* '·

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| l motor M so as to obtain the opening of the gate towards | exit, which allows employees from the sales area or the store to exit without difficulty through the gate.

! 5; i If desired, circuit C can be associated with counters, for counting the number of inputs through the gate: - and the number of outputs through this gate.

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It is also possible to count the number of carriages that pass through the gate, for example at. means of the cell located upstream of the gate and a counter associated with this cell. The cell is then placed so as to detect the passage before it of substantially vertical bars which form one side or side of the basket of the carriage. Each time the cell detects the passage of these bars, I the content of the associated counter is increased by one.

Claims (3)

3. Door according to one of the preceding claims, characterized in that said control means comprise 'a first photoelectric cell (cl) disposed upstream of the door relative to the direction of entry into the sales area to detect the arrival of a person and / or a carriage, a second photoelectric cell (c2) detecting a first angular position of the shaft (14) corresponding to the closure of the passageway, a third cell photoelectric (£ 3) detecting the arrival of said / shaft (14) in a second angular position away from yt its first angular position by approximately 90 ° in the direction VL | 10 ί ί it || entering the sales area, and a milk circuit (C) | tement of signals receiving the signals produced by said Ι cells and producing control signals of said motor- J (M) and braking means (20, 22). 4. Gate according to claim 3, characterized in that the circuit circuit (C) commands the triggering of an alarm (A) when, the motor (M) not being supplied, the second cell (c2) detects the rotation. of the shaft (14) in one direction or 10 in the other from its first angular position. I 5; Gate according to claim 3 or 4, characterized in that said vertical shaft (14) is integral with a circular disc (24) having a cutout (26) at its periphery, suitable for being brought in, by rotation of said shaft (14 ), opposite said second and third cells (ç2, ç3). 6. Gate according to one of the preceding claims, characterized by a torque limiter (18) interposed between the electric motor (M) and the vertical shaft (14); <\ i ....... J -. 7. Gate according to one of the preceding claims, characterized in that it comprises a combination mechanism, for example controlled by a key or by a push button, for controlling the release of the braking means (20 , 22) and the rotation of said shaft (14), from its position an-. gular corresponding to the closing of the entry way, in the opposite direction to the direction of rotation corresponding to the entry into the sales area. 30 8. Gate according to one of claims 3 to 5, characterized in that counters are associated with the cell (c ^) placed upstream of the gate and / or the circuit (ci. _____ β ^ '