DE3021363A1 - Monitor for movement of automatic sliding door - has movable safety strip cutting light beam to reverse door direction - Google Patents

Abstract

The monitor has a light source and photodetector to reverse the direction of the door's drive when a person cuts the light beam. A reflector mirror (4) is attached to the door and reflects the light from the source to the photodetector, which forms part of the same unit (8). A strip (5) is attached to the front of the door and moves when it touches an obstacle (eg a person). The strip then covers the mirror interrupting the light beam and causing the direction of the door to reverse - i.e. causing the door to open again. Alternatively, the strip may be linked via levers to the support that holds the reflector. The reflector is moved when the strip is moved and light ceases to reach the photodetector. The strip strip provides additional safety.

Description

Device for monitoring the movement of a

Subject.

The invention relates to a device for monitoring the Movement of an object, in particular one that is moved horizontally, automatically powered sliding gates, with a controllable drive for the object and with a light path between a light source and a light receiver that if the light path is interrupted, the drive responds reversibly or continuously.

For sliding gates that are driven by a motor, there are safety regulations to ensure that the operator does not open the gate can run into an obstacle or potentially injure a person, which is in the path of movement of the gate. After all, they are factory gates or the like

by many tons of heavy parts that provide a relatively powerful drive need, whereby the person operating the door cannot always overlook whether there is no obstacle or person in the path of movement of the gate.

To prevent this, there is, for example, a light barrier between the post of the gate and the gate itself provided, the interruption of this The light barrier means that the drive for the gate is either switched off or even is reversed. In the case of the light barrier, however, only one such obstacle can be detected that is located within the actual light path of this facility.

It is therefore known, in addition to the aforementioned backup by a light barrier to provide a so-called pressure wave strip on the front edge of the door. It is a plastic hose, which with some pressure medium is filled and what if an obstacle or an object is hit a pressure wave is generated, which is picked up by a membrane switch, which in turn generates an electrical signal. This electrical signal must now be sent by the movable one Gate can be guided via cables to the drive of the gate, where the desired Initiate control (reversing or stopping). A disadvantage of this arrangement is on the one hand that between the moving gate and the stationary drive any Movable line (traveling cable or cable drum with sliding contact) must be available must so with Response of the pressure wave bar an electrical Signal can be passed on to the drive so that the movement of the gate is interrupted, can be stopped or reversed.

In addition, the pressure wave strips in their mode of operation are very easily susceptible to failure. If the plastic hose is damaged, it can the pressure medium escape and the entire monitoring has become ineffective. This malfunction can only be detected by additional equipment, otherwise the system behaves with a damaged pressure wave bar as whether there is any malfunction. This can mean that when you close the Tores the gate hits an obstacle and, because the monitoring device has failed is, the movement of the gate will not be stopped, making it too substantial Damage to property and personal injury can occur.

The present invention is based on the problem with monitoring devices of the type mentioned to achieve that the monitoring function of the device is inevitably ensured. In other words, for example, the uncertainty excluded a pressure wave strip working with a pressure medium on a gate so that an obstacle in the path of the gate outside the actual light path the light barrier, when it comes into contact with the moving gate, always leads to the further movement of the gate is interrupted or - as desired - the gate in is moved in the opposite direction.

Furthermore, a monitoring device is to be created which has little failure-prone parts, in particular no lines from the movable object may be required for surveillance.

This is achieved by a device of the type mentioned at the beginning achieved that a reflector or mirror on Item arranged is, which in its aligned position, the light from the light source to the light receiver reflected, and that one on contact with an object or with a person im Movement path appealing part arranged at the front end of the object is, which in turn adjusts this directly or via connecting parts with the mirror is connected or covers this by means of a movable cover part.

With the help of such a device can in the simplest way ensure that there is an obstacle in the path of movement of the object is located, the part that responds to the touch is changed in its position so that again brought the mirror arranged on the object out of its rest position so that the light beam falling on it from the light source does not reach the light receiver is returned. With the help of this configuration it can be achieved, as it were, that the entire area of the movement path of the object is monitored, wherein a light path is used for the monitoring itself, which is only known can monitor a small space or essentially a line.

Is particularly essential in the device according to the invention however, that the device according to the invention operates on the open-circuit principle, i. e. inevitably, works. When the object comes into contact with an obstacle or if the light barrier is interrupted, this inevitably leads to a response on this disturbance, so that the desired counter-control of the drive is carried out can be.

No operating case is conceivable in which the monitoring device according to the invention fails due to a defect, so that the object is unimpeded could hit an obstacle.

It is also important that only the mirror is on the object itself attached to the touch sensitive part, electric or pneumatic Lines must not to be fixed by the moving object Facilities are transferred.

According to a preferred embodiment of the invention, the is on the touch-responsive part is designed in the form of a bar that is pivotable attached to a gate. This bar can in turn via a lever device be connected to the storage of the mirror, so that when the bar is touched Mirror swung out of its set position or through a cover is covered. It can be useful here to use the individual transmission elements To be dimensioned so that a relatively small movement - a relatively brings large deflection of the mirror with it, so that a relatively high Response accuracy of the monitoring device can be achieved according to the invention can.

The invention is illustrated below with reference to the drawing, for example explained.

The drawing shows a front view of a gate 7, which on a roller on a base in the direction of a post 9 can be moved or can be moved away from this. Located on the front edge of the gate is a bar 5. It is preferably a plastic, steel or aluminum part, which is attached to the gate 7 in a pivotable manner via two levers 1 is, so that when pressure is applied to the bar 5, the bar 5 leaves its position and the lever 1 pivoted clockwise. At the other end of the lever 1 is a balance rod 2 attached. It is essentially a tube or a flat bar, which connects the two levers 1 so that they are to the same extent be swiveled. A lever 6 can be pivoted at the upper end of the compensating rod 2 attached, which is connected to the storage of a mirror 4 so that upon rotation the lever 1 or pivoting of the lever 6 of the mirror 4 changes its position. A housing 3 for the is purely schematic Mirror 4 shown to the relatively sensitive mirror against mechanical damage from the outside to protect forth, a window being left free on part of the housing.

The mirror 4 is in alignment with a light transmitter and a light receiver, the device having been designated as a whole by 8. The light transmitter and light receiver is attached to the post 9, i.e. in a stationary manner. When responding to an interruption of the light path, this device generates 8 a signal which is used to influence the drive for gate 7, i.e. stopping the gate or even moving it in the opposite direction.

In the normal, trouble-free state, a light beam emanates from the device 8 which strikes the aligned mirror 4. The reflected beam of light finally arrives at the light receiver in the device 8, which in this case indicates no malfunction. If the light barrier is interrupted, this will be mentioned Signal generated by the device 8. If, however, the bar 5 is touched or reached if you hit an obstacle, it changes its position, the levers 1 continue to be pivoted, and finally the lever 6 causes the mirror 4 to be in its aligned position leaves so that the reflected light beam cannot reach the device 8 and addresses them in the aforementioned manner.

Although not shown in the figure, other parts and devices be provided to the device according to the invention an improved safe To lend operational behavior. These are parts that are intended to and for are known in terms of their form and function, although they are related not used to monitor the movement of an object or a gate will.

For example, mechanical parts can be provided in order to be in the open end position of a gate to ensure that when it is reached or leaving this Position of the gate the mirror is brought into the alignment position. For this purpose, for example be present on the gate post belonging to the open end position, the acts on a slide or plunger on the gate to turn the mirror into the one in the figure to bring the position shown. If the mirror is already in this position, so the stop and plunger only serve to check whether the mirror is is in the desired location.

Furthermore, the mirror can be attached so that it can be with the help of a The spring is biased into its alignment position and remains in that position, wherein a pawl device ensures that the mirror more or less in one Locked position is held. There must be the force to overcome the pawl be dimensioned so that the response accuracy of the device does not suffer. With In other words, a slight touch of the bar on the gate should cause with The mirror is brought out of its locking position with the help of the force transmission.

Finally, a permanent magnet can also be attached to the moving object or the door can be provided to the mirror in its aligned when the door is open Able to bring. In other words, the mirror can be in the end position of the gate, i.e. when the door is closed, be positioned so that it is not in alignment to the transmitter and receiver. After a short opening path of a few centimeters the gate is guided past a magnet that acts on the bracket in such a way that it that the mirror is brought into its alignment position.

Finally, it is also possible to use the individual parts of the device according to the invention to be dimensioned so that they are under the effect of their own weight bring the mirror into the aligned position. This should be done by gravity The forces generated act so little on the position of the mirror that the response sensitivity the Device according to the invention does not suffer.

The circuit itself that is used to control the movement of the gate to reverse or terminate, can be designed so that they are on a relatively responds brief impulse, which arises from the fact that the mirror is out of alignment is brought out, whereby it is sufficient that the mirror is only for a very small amount Part of a second is brought out of the aligned position. He can then namely, when the drive control has responded, back into its alignment position fall back, which is now prevented by the circuit that the gate continues to move towards an object.

A special feature of a light barrier device is described below described, which can be used according to the invention to a convenient Control of the gate to reach. When the gate closes, the mirror that is attached to the gate, inevitably brought out of its alignment position and as a result, a switch in the light barrier device switches to its closed position. This switch is now in turn in the circuit that is intended for to operate the drive to open the gate. This means that this normally open contact is in series with a start button. If the start button is pressed, the drive can be powered be supplied precisely because the mirror is in its non-aligned position.

If the gate is in its open position, it can be reached be that the mirror is brought into its alignment position and there mechanically is locked. Shortly after this alignment, the drive is switched via a limit switch switched off for the gate. If the gate is closed, it is the safety device has been put into operation according to the invention.

In a particular embodiment of the invention the Housing 3, which contains the mirror 4, designed so that it is in an appropriate Recess is introduced on the post 9 of the gate, so that no dirt from can reach the outside of the window in the housing 3. Here could be an additional Sealing can be provided so that the device according to the invention from contamination is protected.

On the other hand, the window or the mirror should be through some external Influences are contaminated, the safety device would respond to this, since it detects such pollution as an obstacle in the path of movement and the further drive of the door is blocked or the door is reversed.

Claims (4)

Claims () Device for monitoring the movement of a Object, in particular a horizontally moved, automatically driven Sliding gates, with a controllable drive for the object and with a light path between a light source and a light receiver, which when the light path is interrupted the drive responds reversibly or continuously, characterized in that a Reflector or mirror (4) is arranged on the object (7) in its aligned Location reflects the light from the light source (8) to the light receiver (8), and that one more responsive to contact with an object or with a person in the path of movement Part (5) is arranged at the front end of the object (7), which in turn connected directly or via connecting parts to the mirror (4) so as to adjust it or covers it by means of a movable cover part. 2. Apparatus according to claim 1, characterized in that the at Touch-responsive part in the form of a pivotably arranged on the object (7) Bar (5) is formed. 3. Apparatus according to claim 2, characterized in that a Lever connection (1, 6) between bar (5) and mirror (4) is provided by which the mirror (4) is pivotably arranged. 4. Device rtach claim 3, characterized in that the Lever connection (1, 6) with translation of the movement path of the bar (5) and the Mirror (4) is formed.