DE3418589A1 - Monitoring strip for accident protection of a motor-driven gate leaf, door leaf or the like - Google Patents

Abstract

A monitoring strip for accident protection of a motor-driven gate leaf, door leaf or the like, which can be fitted at least to an edge (20) pointing in the direction of the closing movement, of the gate leaf, door leaf or the like in order to detect an obstruction located in the movement path of the leaf, and which has a section which extends away over virtually the entire edge length and is easily deformable in the event of impact against an obstruction directed onto the edge, said section especially being in the form of a hollow rubber bead, in which at least one pair of electrical conductors - also in the form of conductor groups - which extend over its length are provided, which are held at a distance from one another during obstruction-free operation and to which a signal evaluation apparatus can be connected, which monitoring strip is designed for a construction which can be produced cost-effectively, is maintenance free, operates reliably, is independent of environmental influences and can easily compensate for fluctuations, for example of the temperature, in such a manner that the conductors are held at a distance from one another, without making contact, along their longitudinal extent, in every deformation position of the section.

Description

The invention relates to a monitoring strip for

the accident protection of a motor-driven gate or door leaf with the features of the preamble of claim 1.

Accident prevention monitors are everywhere required when motor-driven doors, e.g. sliding doors, Gates, in particular gates that can be moved vertically or overhead, sliding gates and the like especially during the closing process pass through a room in which unpredictably an object or an object during the movement of the gate or door leaf Person can get. In this case the movement of the gate or door leaf must stopped immediately or the drive direction reversed to avoid the detected obstacle to release again.

For this purpose one has already on the or the edges of the gate or Door leaf, which points in the direction of movement to be monitored, a monitoring strip attached by compressing a correspondingly deformable portion emits a signal when it encounters an obstacle, which stops the drive motor or the drive direction reverses.

The deformable section of the bar is used as the sensing element a so-called air switch has already been used, i.e. a hose that is connected to Compression experiences a corresponding reduction in its internal volume, as a result of which an air pressure pulse is passed on to a switch that responds to it. However, such a compressed air wave occurs just impulsively on it it is only possible for the door or door leaf edge to hit an obstacle ascertain. If this impact is gentle, the impulse may be too weak so that the switch-off or switchover does not take place and the gate continues to run, although the hose remains compressed. So it's just dynamic palpation of the obstacle possible. In addition, there is such a monitoring device requires maintenance because a leak in the hose is not automatically indicated will. In addition, changes in temperature and air pressure cause difficulties.

On the other hand, more reliable working monitoring strips work with switching foils, connected switching elements or with materials that change their electrical resistance or contact resistance under pressure. This leaves in the simplest case by two electrical conductors, which in the undeformed state of the bar practically extend over its length and brought into contact with one another when deformed by hitting an obstacle will. These electrical switching elements and conductors can be arranged one behind the other in this way switch that if an element fails or a line is interrupted, a corresponding one Closed circuit is opened, so that a connected signal receiving and switching device switches off the drive. The disadvantage here is contamination and the risk of corrosion existing contact surfaces. Even if it is hermetically sealed against external influences Bar cavity and / or sealing of such switching elements in foils and the like especially changes in humidity occur in such small climate rooms Corrosion and at least impairment of the resistance conditions draw. Above all, however, those are based on changes in resistance Scanning devices in known practical designs are expensive to manufacture and require a cost-intensive use of materials.

The invention is based on the object of a monitoring strip of the type mentioned to make available, which can be produced inexpensively is maintenance-free and reliable and is independent of environmental influences or can be easily compensated for fluctuations, for example in temperature.

Based on a monitoring bar with the features of the generic term of claim 1, this object is achieved according to the invention by its characterizing features Features solved.

The monitoring strip according to the invention, which operates on an electrical scanning basis avoids metallic contacts and thus the measurement of a change in resistance in the Case of deformation by an obstacle. Rather, field sizes are scanned, with the result that the conductors or groups of conductors are each completely insulated can be encased. Even an oxidation and a certain change in humidity stay inside the ledge cavity - at least when scanning the magnetic Field - without influence. This monitoring strip works practically maintenance-free. Its structure is easy to design; changes in temperature only have an influence the electrical resistance of the conductors and leads and let through Compensate known measures.

A first possibility of resistance-free scanning of the deformation state consists in the monitoring of the electric field, in dcm one dcls three-wire pair as Capacitor operates. The conductors are arranged in such a way that they are spaced apart change from each other when the bar or its deformable section is deformed, so that the resulting change in capacitance by a corresponding signal receiving device can be evaluated. For this purpose, the capacitor formed from the conductors Be part of an oscillating circuit with a certain resonance frequency in the normal Operating state oscillates. If the bar is deformed by hitting an obstacle If the resonance frequency changes, the frequency deviation may be due to known electrical Switching measures are recorded and used to switch the motor off or over. By ensuring a certain leakage current, for example by specifically dimensioned High-resistance bridges between the conductors, the device can also break the conductor monitored, for example by a superimposed direct current.

In a preferred embodiment, the scanning of magnetic value changes, caused by deformation of the monitoring strip by hitting an obstacle are used to generate a corresponding signal. Be for this purpose the conductors joined together to form a coil turn, in such a way that they extend in the longitudinal direction the bar extending conductor form the longitudinal branches of such a coil turn. By arranging several such series branches of turns in parallel and connecting them in series to a corresponding multi-layer coil, the sensitivity can be significant raise. The parallel in the direction of the direction of rotation longitudinal branches of the windings then form a group of leaders.

The two conductors or groups of conductors are arranged in this way in the direction of deformation the bar lying one behind the other that when it hits an obstacle and thus When the deformation occurs, the conductors or groups of conductors approach each other if you move the winding plane in the direction of deformation, you get when Deformation is a reduction in the area encompassed by the turn or coil, which leads to a change in the self-induction of this winding or

Coil leads. This self-induction change can in turn by a Signal recording device detected accordingly and in a down or reversing signal for the Drive motor are reshaped. The coil preferably forms part of a Resonant circuit with a certain resonance frequency, which is created by changing the coil windings encompassed area experiences a corresponding deviation, which in a known manner can be determined by an electrical circuit.

Another preferred embodiment is the magnetic To change the resistance of the magnetic circuit of the single or multi-layer coil. To this Purposes, the coil is arranged in the bar in such a way that the direction of deformation is directed approximately perpendicular to the coil plane. One roughly the length of the monitoring strip and thus the obstacle course to be monitored is one-part or multi-part Strip of magnetically conductive material, such as soft iron, is so arranged on the bar or the deformable section that it is in the event of deformation changes its distance to the coil plane. This also increases the coil inductance influences what in a corresponding signal evaluation, for example according to the above Kind that is detectable.

Instead of or in addition to a strip of the aforementioned Art, a strip made of permanent magnetic material can be used Arrangement in the case of deformation a tension in the single or multi-layer coil induces what can initially be evaluated as a dynamic signal. Additionally changes the magnetic resistance of the magnetic field of the coil.

Instead of such a permanent magnetic strip can also Arrange a magnetic field excitation coil accordingly, which is also a dynamic one Signal in case of deformation induced in the sensing coil and a static display of the deformation state by means of an alternating magnetic field enables.

These and other preferred embodiments of the invention result from the subclaims, in particular in connection with those reproduced in the drawing Exemplary embodiments, the following description of which explains the invention in more detail. 1 shows a schematic cross section through a first exemplary embodiment a monitoring strip; 2 shows a schematic longitudinal section through the exemplary embodiment limited according to Figure 1 to the coil used; 3 shows a schematic cross section by a further embodiment of the monitoring strip; Fig. 4 is a schematic Longitudinal section through the embodiment of FIG. 3 limited to reproduction the coil and the metal strip used; 5 shows a schematic diagram of a signal evaluation device to which the conductors can be connected according to the aforementioned exemplary embodiments.

Fig. 1 shows the cross-sectional contour of a monitoring strip in shape a hollow rubber bead, which with the help of undercut trained snap-in knobs or strips 2 in appropriately designed receiving openings in the side area of the edge pointing in the closing movement direction of a not shown The gate or door leaf can be fixed in a latching manner. Between the latching strips 2 having profile webs extends the bottom area 3 of the bar or of the Bead that rests on the edge surface of the door or gate leaf when installed. I) (^ m Bodenborei ch 3 is a section spaced in the direction of movement of the door edge 4 opposite, which when it encounters an obstacle in the course of the movement of the door or door leaf is deformed, elastic. In the profile side areas the bottom area 3 and the section 4 are connected to one another via webs 21, so that a cavity 5 is formed between the webs, the bottom area and the section which, if the profile is undeformed, has a circular or

Has elliptical cross-section. Walk to the side of section 4 the webs 21 in thin-walled flaps 23, those of the sealing system in the closed state of the door or gate leaf and possibly also the additional scanning of a Serve as an obstacle.

In the example of FIG. 1, there is once approximately in the longitudinal center of the floor area 3 and in the longitudinal center of section 4 each one in the longitudinal direction of the bar continuous recess 6 for the reception of conductors 7 and 7 'provided.

The electrical conductors 7 and 7 'thus run in the longitudinal direction of the hollow rubber bead or the bar 1 over practically their length and lie parallel with regard to the direction of deformation 22 when encountering an obstacle spaced one behind the other. If the deformable section 4 of the hollow rubber bead meets 1 in the course of the door and door leaf movement perpendicular to the edge face on Obstacle, so the ladder 7 'in section 4 against the ladder 7 in the floor area 3 of the bead 1 offset, at least in areas, as shown at 12 in Fig. 2 is indicated.

The two conductors 7 and 7 'can be "plates" of a capacitor, between which an electric field is built up across the cavity 5. The conductors 7 and 7 'are then expediently designed in the form of a band and with their broad surfaces facing each other. In this case the cond <'n.'; At orbe t r 1 eh end the Head 7 and 7 'free at one end of the hollow rubber bead 1, while at the other The end of the bead is connected to a feed and evaluation circuit 11 via connections 10 an example of this is given in FIG. This feed and evaluation circuit 11 applies a voltage to the conductors 7 and 7 ', which the electric field passes through the cavity 5 causes. The capacitor made up of conductors 7 and 7 'is part of one Resonant circuit together with other associated elements in the detector circuit 17 of the feed and evaluation circuit 11 (Fig. 5). The resonance frequency of this oscillating circuit is set when section 4 is undeformed. Steps when encountering an obstacle a change in distance between the conductors 7 and 7 ', then due to this caused by the change in capacitance of the resonant circuit, which is determined by the detector circuit perceived in a known manner and converted into a modulation signal for a relay 18 is, which in turn interrupts a closed circuit 20 for the supply of the motor or reverses its direction of rotation, as is indicated schematically in FIG. 5.

In a preferred embodiment, the conductors 7 and 7 'are branches as longitudinal a coil turn, i.e. they are at one end of the hollow rubber bead 1 connected to each other and at the other end of the bead 1 with the connections 10, as illustrated in FIG. The single-layer coil thus formed 8 (Fig. 2) can also be multilayered, i.e. consist of several turns, one behind the other are connected and each have series branches 7 and 7 '. The sum of the longitudinal branches 7 forms a group of conductors of the pair of conductors 7, 7 ', while the other longitudinal branches 7 'the other group of leaders form. By increasing the number of turns the self-induction coefficient of this coil is increased considerably. At this Embodiment, the conductors 7, 7 'or the wires of the turn are primarily with round cross-section and in particular designed as a stranded wire, which increases the deformability elevated.

The coil is via a connecting path 9 and the connections 10 wound with a feed and evaluation circuit 11, as shown in Fig. 5 is reproduced. The coil forms together with corresponding components in the detector 17 of the circuit 11 in turn a resonant circuit, the resonance frequency depends on the self-inductance of the coil 8. This self inductance is depending on the area encompassed by the coil turns, that is to say essentially from the area between the conductor branches 7 and 7 '. In the undeformed state of the Section 4 or the rubber hollow bead 1 with full cross section of the cavity 5, as shown in FIG. 1, a certain resonance frequency now occurs by hitting an obstacle, the section 4 on the bottom area 3 of the bead 1 deformed, the area between the coil branches 7 and 7 'is correspondingly reduced, which leads to a detuning of the resonance circuit and thus a corresponding one Change in the resonance frequency previously recorded as normal operating value in the undeformed state leads. This deviation is evaluated in the detector 17 of the circuit 11 (FIG. 5) and converted into a signal for the energization of the relay 18, thereby thereby caused switching state of the feed circuit 20 of the drive motor interrupted or the direction of rotation is switched.

This coil formation of the conductors 7 and 7 'has the advantage of a particular simple monitoring of the system for operational readiness. When a coil wire breaks or in the area of the connection line etc. the oscillating circuit is interrupted, What leads to a fault indication by the relay 18 via the contact device 19. The operational readiness of the system is thus monitored automatically.

This automatic operational monitoring also applies to the exemplary embodiment according to Figures 3 and 4. In this latter embodiment, there are receiving openings 13 for conductors 14 or 14 ', which form a single or multi-layer coil 15 (Fig. 4), in the longitudinal edge sections near the bottom area 3 of the hollow rubber bead 1 in whose longitudinal direction is designed to run so that the with their longitudinal branches the Head or

Conductor groups 14 and 14 'forming coil 15 with regard to the winding plane is located such that the deformation of the section 4 upon impact on a Obstacle is directed approximately perpendicular to the coil plane according to arrow 22, that is around 900 compared to the coil plane of the example according to Figures 1 and 2, in which the direction of deformation is parallel to the coil plane, rotated.

Opposite the coil plane is in the deformable section 4 a strip extending over the longitudinal extent of the conductors 14 or 14 ' made of magnetically conductive material, for example soft iron sheet, arranged, which can be subdivided in the transverse and / or longitudinal direction for better deformability can. In the undeformed state, the strip 16 is correspondingly far from the coil plane removed, there is a certain self-inductance of the coil 15 which together with further components in the detector 17 of the circuit 11 (Fig. 5) an oscillating circuit with a certain resonance frequency that forms the undeformed and thus ready for operation Condition of the hollow rubber bead 1 corresponds. Is generated by striking an obstacle If the section 4 is deformed in the direction of arrow 22, the strip moves 16 to the coil plane, whereby the induction of the coil 15 is changed. the the resulting detuning of the oscillating circuit leads to a Frequency deviation, which is evaluated in the detector 17 and converted into a response signal for the relay 18 is reshaped, which then the feed circuit 20 of the drive motor interrupts or reverses the direction of rotation.

Instead of a strip 16 made of magnetically conductive material, like sheet iron, this strip can be made from a modified version of a permanent magnet material be formed or contain one. In the case of deformation, in the coil 15 induces a voltage, which in turn is generated by an evaluation circuit can be determined and converted into a switch-off signal. The strip 16 can with regard to its material property be designed such that in addition to the dynamic Voltage pulse also changes the inductance of the coil of a static nature takes place, as in connection with the strip of magnetically conductive material has been described above. You can therefore hit an obstacle by means of an impulse and at the same time a permanent detuning corresponding to the deformation of an oscillating circuit.

In Fig. 4, the strip 16 is shown hatched in front of it to clarify the background of the coil level.

It may be added that in the case of the above-mentioned Operation of the conductors 7 and 7 'as a capacitor, the connection line shown in FIG 25 between the corresponding conductor ends of the conductors 7 and 7 'is not present.

The evaluation of the impact on an obstacle and thus deformation of the hollow rubber bead 1 changing the electric or magnetic field was described in connection with an oscillating circuit operation, are to the expert therefor supply and evaluation circuits in a variety of ways execution known. Another evaluation of these field changes can also be carried out, which does not need any further explanation here.

Instead of a strip 16 made of or with the use of a permanent magnet Material, a coil can be used at the appropriate point in the section, which is indicated at 24 in FIG. This coil generates with the appropriate supply a magnetic field similar to that of the permanent magnetic strip on the Coil 15 acts.

To this extent, there is also a mutual influence of the coils 15 and 24 instead, which provides additional variability in the design of the dining and Evaluation circuit enabled.

It is of particular advantage that the deformation of section 4 does not occur must be carried out approximately up to the bottom area 3 to generate a deformation signal trigger. Depending on the design of the threshold value, a smaller approximation can already be made the section 4 to the bottom area 3 suffice to hit an obstacle display so that the device works accordingly sensitively and a follow-up section is given by residual deformation of the hollow rubber profile.

Claims (12)

MONITORING BAR FOR THE ACCIDENTAL PROTECTION OF A MOTOR-DRIVEN OPERATOR GATE, DOOR LEAF OD. DGL. LEAF OD. DGL. CLAIMS 1. Monitoring strip for the accident protection of a motorized driven gate, door leaf or the like, at least one in the closing direction of movement pointing edge of the gate, door leaf or the like to feel one in the Movement path of the sheet located obstacle can be attached and the one practically extending over the entire length of the edge when they hit on an obstacle on the edge trimmed easily deformable section - in particular in the form of a hollow rubber bead - in which at least one pair meets Electrical conductors extending over its length - also in the form of conductor groups - Are provided, which are kept at a distance from each other during unobstructed operation and to which a signal evaluation device can be connected, d u r c h g e k e n n z e i c h -n e t that in every deformation position of section (4) the ladder (7, 7 '; 14, 14') spaced from one another in a contact-free manner along their longitudinal extent are held. 2. Bar according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the conductors (7, 7 ') seen in the deformation direction (22) of the section (4) are spaced apart. 3. Bar according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the conductors (14, 14 ') transverse to the deformation direction (22) of the section (4) are spaced apart. 4. Bar according to one of claims 1 to 3, d a d u r c h g e k e n n z e i h n e t that the conductors (7, 7 '; 14, 14') or groups of conductors each other opposite longitudinal branches of a coil having one or more turns (8; 15) are. 5. Bar according to claims 3 and 4, d a d u r c h g e -k e n n z e i c h n e t that in the deformation direction (22) of the section (4) of the Ladders (14, 14 ') spaced apart point a one-piece or continuously formed Strips (14) made of magnetically conductive or permanent magnetic material are arranged is, which is approximately parallel to the conductors (14, 14 ') over practically the entire Length of the section (4) extends. 6. Bar according to claims 3 and 4, d a d u r c h g e -k e n n z e i c h n e t that in the deformation direction (22) of the section (4) of the Conductors (14, 14 ') spaced a magnetic field generator coil (24) arranged is whose longitudinal branches are approximately parallel to the conductors (14, 14 ') about practically extend the entire length of the section (4). 7. Bar according to one of claims 1 to 6, d a d u r c h g e k e n n z e i c h n e t that the conductors (7, 7 '; 14, 14') or the coil wires as strands are trained. 8. Bar according to one of claims 1 to 6, d a d u r c h g e k e It is noted that the conductors (7, 7 ') have a band shape and have a wide area are arranged opposite one another. 9. Bar according to one of claims 1, 2, 4 and 8, d a -d u r c h it is not indicated that one conductor (7) or one group of conductors of the pair of conductors (7.7 ') in the floor area facing the edge of the door or door leaf (3) the bar (1) and the other head (7 ') or the other group of conductors in the in the deformation direction (22) opposite, when deformed on the bottom area (3) arranged in the movable area of the deformable section (4) of the bar (1) are. 10. Bar according to one of claims 1, 3 and 4 to 8, d a -d u r c h g e k e n n n z e i c h n e t that the conductors (14, 14 ') or the groups of conductors of the Pair of conductors in the floor area facing the edge of the gate or door leaf (3) the bar (1) and the strip (16) made of magnetically conductive or permanent magnet Material or the generator coil (24) in the opposite in deformation direction (22), when deformed onto the floor area (3), the area of the section (4) becomes movable the bar (1) are arranged or vice versa. 11. Bar according to one of claims 1 to 10, d a d u r c h g e k It is noted that the conductors (7, 7 '; 14, 14') or the groups of conductors, the Magnetic strips (16) conductive or permanent magnetic Material or the generator coil (24) in its entirety by a shield against external influences in the form of a metallic covering, a close-meshed one Wire mesh, a film or the like are included on or in the surrounding Outer wall of the bar (1) or its deformable section (4) is arranged. 12. Bar according to one of claims 1 to 11, d a d u r c h g e k It is noted that the conductors or groups of conductors are spiral or meandering are arranged to run.