DE2719438A1 - Safety device for automatic doors - has compression strip having decreased electrical resistance under pressure - Google Patents

Abstract

The signal transmitter consists of an elastic strip which is located over the whole length of a door joint. The signal terminals are connected through electrodes to a supply voltage and to a control unit which sounds an alarm or reverses or cuts out the automatic movement of the door. The shape of the elastic strip is to be suitable for the edges of the doors and may be circular or rectangular or flat. The electrodes are covered with insulating material. The circuit is such that current flows along the elastic compression element at all times, and the current is increased when the element is under pressure such as when some object is caught in the closing door.

Description

Security device

The invention relates to a safety device on crushing, Shear and / or closing edges @ei power-operated devices, such as door and gate systems, Pressing and / or the like., With one arranged substantially along the entire edge Signal transmitter that drives the power-operated device via a control unit connected is.

In known safety devices of this type, the signal transmitter is a pneumatically acting element, namely a hose wrapped with air, the possibly connected to the control unit for the drive via a pressure wave switch is. If the hose is compressed, for example by the fact that at one Vehicle for transporting a person between the person who is firing Doors is located, this of course results in a pressure wave with which Help after conversion through a mechano-electrical element of the A @@@ ie @ @tillosed or is controlled in the opposite direction. A @such security device is Although Ko @ tengünsti and thus economically @ buildable and deployable, it has the disadvantage that it cannot monitor itself. For example, does the air-filled claws a senadna-like, for example a leak, that's how it is possible that the pressure wave occurring due to the compression of the rubber hose the mcchano-electric converter n @@ ht reached because the compressed air or a too A large part of the pressure can escape at the leak. this @ indicates, however, that the safety device is inoperative, a @ s @ fails, without anyone noticing. This danger exists especially in the case of such kraf @@ e @ actuated devices, such as door and gate systems arranged outdoors and thus exposed to the weather in a considerable way are, so that after a long period of operation there is a high probability that the used Aircraft is no longer tight. The guidelines of the Beru @ sgenossensehaft very @@ ben ongoing monitoring and testing of the security facility before, however this is very time-consuming and complex and would have to take place within relatively short time intervals take place.

It is true that safety devices are known that monitor themselves can, such as so-called. Light and ultrasonic sh @ anken. However, these are known facilities on the one hand very expensive, so that therefore their possible use remains restricted, and on the other hand, it is not possible with ililen to create longitudinal edges to secure their entire area equally, as they are only in sections and so that they can be used selectively.

It is an object of the present invention to provide a safety device of the type mentioned at the beginning, who are self-monitoring I-ann and the nevertheless in an economical way to secure the entire length evenly can be used by crushing, shearing and / or closing edges.

To solve this problem, the invention provides that the Signalgebe @ has at least two electrical conductor elements that are elastic on one deformable insulating bodies are kept at a certain distance when at rest, and that the conductor elements are connected to a voltage source in the region of their one end and connected to one another in the area of their other end via a measuring resistor are.

The safety device according to the invention works according to the Closed-circuit principle, whereby the closed-circuit, the the self-monitoring made possible by connecting the conductor elements via a measuring resistor @ and built up is.

This is done on an edge of a power operated device to be secured arranged signal transmitter element compressed at any point of its longitudinal area, so the two conductor elements come into contact with each other, which is a change of the resistance in the closed circuit. This change of electrical Resistance is used for signal gahe, for example via a Rclais Drive the power-operated device is stopped or reversed. Even damage to the conductor elements results in a change in resistance, since then one the two conductors are separated and the circuit is interrupted. This means, that the safety device according to the invention can monitor itself. So long the change in resistance exists is an operation of the power operated device, such as windows, doors @, gates and the like are not possible. This is an essential one Requirement of the safety regulations met, according to which a power-operated Operation must not be possible as long as a safety device is activated or as long as this is defective. So this is a self-monitoring security device created that can be produced with the lowest possible effort and thus economically deployable is.

It sc @ afft the possibility of @cutting down the relevant drive or to change direction, regardless of where - also selectively - a pressure on the signal @ @er by @@ nen in the vicinity of the edge in question or person is exercised. The device according to the invention also has the advantage that the signal @ to the For @@@ relevant squeeze, shear and / or closing edge an @ pa @ t or can be cut, even if the edge to be secured is one of has a shape deviating from a straight line, as is the case, for example, with door edges of Tramways and buses are the case, which are curved in the lower area.

In a preferred embodiment of the present invention the conductor elements are bundled by band-shaped electrodes, which are shown, for example, in Grooves of a single insulating body are opposite each other or on each other opposite surfaces of a multi-part insulating body are arranged.

It is possible to have two electrodes in a longitudinal central area of the insulating body to order; In some cases, however, cs can also be useful, two by two in the form of a ribbon Arrange electrodes symmetrically to the longitudinal center plane on the insulator and parallel to switch. The electrodes can be made of copper foil, for example are glued to the insulating body, but they can also by on the insulating body Conductive material sprayed on in the relevant area can be formed.

In another preferred embodiment of the present invention are the conductor elements by means of two elastically formable foam strips, preferably from a linear polymer material, which are impregnated with a conductive varnish and which are kept at a distance by an insulating body. In this embodiment so the conductor elements themselves are elastically deformable in such a way that they sc? i at touch a certain pressure and thus a change in resistance in the closed circuit can evoke.

The signal transmitter constructed in this way is expedient embedded in an elastically deformable hollow profile, for example made of rubber in particular on its attachment side essentially the shape of a pneumatic May have safety devices used hose.

On the one hand, this protects the signal transmitter against external influences and on the other hand it is possible in a simple manner to use power-operated V @ directions umzuriisten to the security device according to the invention. The elastically deformable Profile, which can be relatively stiff depending on the desired minimum pressure, sits between its mounting side and the flue area that accommodates the signal transmitter a resilient area that prevents the inevitable overtravel of power operated Can accommodate devices after they have been switched off or reversed. This will a further protection is achieved through the individual formation of the profile.

Further details and embodiments of the invention are as follows Refer to the description in which the invention is based on the illustrated in the drawing Embodiments will be described and explained in more detail. It times: Fig. 1 in schematic representation of the application of a safety device according to the invention in the case of a door on a rail vehicle, FIG. 2 in a perspective illustration a security device according to the invention used according to FIG. 1 according to a Embodiment of the present invention and Fig. A -) -C in a schematic representation further exemplary embodiments of a signal transmitter of the safety device according to the invention.

The safety device according to the invention shown in the drawing is on crushing, shearing, closing or similar edges on power-operated devices, such as door and gate systems, presses and / or the like. Usable.

In Fig. 1, the safety device according to the invention is for example represented by a double 112, as it is in rail vehicles, such as trams, Subway trains and the like., Or is used in buses. The two wings of the double door 112, which approach each other during the closing movement, are each separated via a drive not shown in further detail in FIG. 1, for example a pneumatic one Drive, Can be actuated via a reversing valve located in the course of the compressed air line. At her facing closing edges 11 @ have the two wings of the double door 112 each one that has an electrical effect and runs over the entire length of the edge Beeper 111 that cracked over one in.

Control unit, also not shown, with the relevant one Drive or both drives connected is-b.

When the signal generator 111 responds during the closing movement of the Double door 112 or in the event of a defect in the signal generator 111 wirt uer drive for the Double door shut down and / or CLOSED stroke movement reversed in the opposite direction.

According to FIG. 2, the signal generator 111 consists of an elastically deformable one Insulating body 116, which is designed like a strip, approximately rectangular in cross section and is made of a foam or foam rubber. The insulator 416, whose length corresponds to the length of the door edge 113, has transverse to the longitudinal center plane 117 two grooves 118 running symmetrically to the transverse center plane, the two of which are one above the other Side walls occupied with band-shaped electrodes, for example against each other electrically isolated bel-lives are. In each groove 118 there are two / electrodes 119 in the direction the longitudinal center plane 117 one above the other. The electrodes 119 can, for example be made of copper foil, but they can also / on the insulating body 116 on the relevant point be formed sprayed conductive material. Even the electrodes 119 run over the entire length of the insulating body 116. On their the electrodes 119 lying one above the other are at one end in pairs connected to a control device 121, not shown, which is connected to an internal Voltage source is given away. The control unit 121 is in turn @ the drive 122 connected, where @gf. an electro-pneumatic converter unit interposed is. The other end of the two pairs of electrodes connected in parallel is given away with a measuring resistor l23, which the @@@ en lying on top of each other Electrodes of each pair of electrodes connects to each other.

The signal generator III is in a longitudinal cavity 128 one elastic profile 129, for example made of a rubber, preferably under bias inserted by gently compressing the elastic insulating body 116. Because of The correct cross-section of both parts can be attached to the insulating body 116 in the cavity 128 do not twist. The profile 129 has a rounded one at its free end Sealing lip 133, which forms a further, approximately crescent-shaped cavity. At the Opposite, firmly clamped long side, the profile 129 has a double T-bar 132, by means of which the profile in a corresponding undercut retaining profile 134 can be attached to each of the closing edges 113 of the double door 112.

Between the double T-bar 132 and the cavity 128 is a second one Cavity 136 is provided, which serves to slow down the disconnected drive 122 yielding to catch. the Fastening strip 132 of the profile 129 is s @ trained in an advantageous way that it goes against the previous ones and in a different way, air hoses for Drue @ we @ lensienerne @ t facilities are attached can be exchanged.

The @ un @@ safety device provided with the signal transmitter III is ionized in the following way: In the @unesustand, that means for example in the @opened @ustand of the double door 112, as shown in FIG 119 of each pair of electrodes held in a @@@@@@ mten Abs @ and. Because the electrodes 119 are connected to a voltage source at one end and at the other end are bridged by the measuring resistor 123, a certain quiescent current flows, the via the control unit 121 causes the drive 122 for the double door 112 to Senli @@@ n the double door can be operated. Is now in the process of closing the double door 112 between the two sc @@ icßkanten 113 of the in Fig. 1 in a schematic Representation and partially shown rail vehicle 114 a person or an object, when the hollow profile 129 strikes one or both Wing @ of the double door 112 on the person or object first the sealing lip 133 and then the elastically deformable insulating body 116 of the signal body III this point in question compressed. The compression of the insulator 116 causes that the superposed electrodes 119 Move at least one pair of electrodes towards each other @ and finally @ touch each other. Touching the electrodes 119 means that the measuring resistor 123 bridges, i.e. short @circuited. The short circuit in turn causes an increase in the Current compared to the flowing in the idle state, which is not shown Way via the control unit 121 @ is acted, because by dropping or reversing a polarity Relay the drive 122 is stopped or reversed. Successful in both cases a certain overrun of the drive 122 or the double door 112 in the direction of the closing movement, which, however, is resiliently absorbed by the profile 129 due to the second cavity 136 can be. If the compression or squeezing of the signal generator 111 stops, so the idle state is restored, in which the drive 122 is actuated again can be. 5 it is understood that the size of the measuring resistor 123 depends on the selected Data of certain elements in the control unit 121 is dependent on iss.

If, on the other hand, the signal transmitter 111 is damaged in any way, for example, in that from the insulating body lló including the electrodes 119 a section is torn out, this also changes the volume resistance.

But this is not now, but rather infinite, which means that the safety device due to the change in quiescent current, for example.

comes into operation via a relay. Damage to the signal transmitter 111 in this way therefore causes the double door 112 not more closes. Since the voltage supply at one end of the electrodes 119 and the measuring resistor 12 @ is arranged at the other end, the inventive @ Signa @ geber 111 able to unrestrictedly seli, ;;, monitor, also for example when the measuring resistor 123 is defective. The function of the signal generator lll is regardless of the point at which the insulating body 116 are compressed and regardless of whether this printing is purely, linear or flat. Furthermore, the response of the signal generator 111 is independent of whether it is only pressed together on one or at the same time on both wings of the double door 112 will. It goes without saying that it is also possible to use the signal generator according to the invention To be used on single-leaf, i.e. simple doors.

In Figs. Ffi> 3a, b, c, further exemplary embodiments are one Signal transmitter 111 shown, with the representation of the hollow profile 129 and of the control unit including the voltage source has been omitted. The function the signal generator of these embodiments is the same as that based on the in Fig. 2 described; it is only the arrangement and design of the electrodes and of the insulator different. Depending on the particular shape and arrangement, @ them on corresponding squeezing, shearing, closing edges or the like. Various power-operated devices Devices, such as for example pressing, but also on others Doors, such as on Fah @ chair doors, roller shutters or the like.

Find use.

According to FIG. 3a, the body carrying the electrodes 119 is. 116 'in several parts educated. The body 116 'consists of two @ insulating strips 141, which are attached to each other facing surfaces 142 in the area @ of the longitudinal center plane with the Elettr @ the 119 can be seen and which are kept at a distance by two strange insulating strips @@ 143. While the insulating strip 143 is similar to the insulating body 116 from an elastic deformable foam or foam rubber, the insulating strips 141, the riiit the electrodes 119 are provided, either also made of an elastic one deformable material, such as foam or foam rubber, or from a solid body. The cross section of this body 116 'corresponds to @em of the insulating body 116. Included In this exemplary embodiment, the two electrodes 119 arranged one above the other in FIG @er longitudinal center plane of the body 116 ', it is sufficient for certain applications, only a pair of electrodes to be provided.

In Fig. 3b, an embodiment is shown in which the signal transmitter 111 also has two insulating strips 141, but only through one insulating strips 143 extending in the longitudinal center plane are kept at a distance.

Unlike in the exemplary embodiment in FIG. @ A, they are the electrons 119 each arranged on the longitudinal sides 144 of the @ s @ lier- @ eisten 141. Are there In each case the Elcktro @@@ 119 elner l @ olierieiste 141 connected in parallel. By pressing together of the insulating strip 143 are the sides that are just opposite each other Electrodes 119 brought into contact.

In Fig. @E an embodiment is shown, @ei which the S @@@ algeber lll instead of the band-shaped electrodes, two lying electrode strips 14 @ verwen @@ t, which are elas @@ en deformable and which by means of an insulating strip 143, which can be elastic or firm, are applied at a distance. The electrode strips 145 consist of an open, flexible foam plastic that is attached to e @ nem electrically conductive lacquer known per se is impregnated. This Leitla @ k is incorporated into the cellular polymer material @ eis @ iels @ eise in this way, preferably inwa @ zt that the walls of the open cells of the foam plastic essentially are completely and evenly covered and by the conductive varnish on the walls adheres, are electrically connected to @@ nander. On the surface of the electrode strips 146 can also provide electrically conductive strips 148 facing away from one another be used as connections for the voltage source on the one hand and the measuring resistor 123 serve at other times. Again, by squeezing and Touching the electrode strips 146 at any point results in a change in the Reached resistance of the closed circuit, which causes a signal. In appropriate Way, the resistance of this closed circuit is also changed when the or the electrode strips 146 are damaged. It goes without saying that of the foam impregnated with a conductive varnish, another made conductive Plastic or some other elastically deformable conductive material is used can be. In addition to mechanical damage, other external influences can also occur lead to a change in resistance in the quiescent current, such as penetration a conductive liquid, in particular water, into the safety device.

L e r s e i t e

Claims (1)

P a t e n t a n s p r ü c h e safety device on crushing, Shear and / or closing edges on power-operated devices, such as door and gate systems, Pressing and / or the like. With a substantially arranged along the entire edge Signal transmitter that controls the drive of the power-operated device via a control unit connected thereby that the signal generator (III) at least has two electrical conductor elements (119, 14b) which are elastically deformable on one Insulating bodies (116, 116 ') are kept at a certain distance in the rest state, and that the conductor elements (119, 14 @) in the region of their one end with a voltage source and connected to one another in the area of their other end via a measuring resistor (123) are. @. Einrlentun @ according to claim 1, da @ ur @@ e @ n e @, @ a @ the conductor elements by @ a @ dfö @ r @@ e Ele @@@@@@@ (119) @e @@@ de @ are. . A @@ e @@@@, according to claims 2, da @ arch g e L e @ nz e c n -n e t that the electrodes (119) cut into one in the elast @ @@ n @ ör @ er (11 @) Nut (11 @) to @ eerdne @ si @ @@ @n Direction of the occurring pressure to @@@@ die @ en. 4. Device according to claim 2 or 3, characterized by @ e @ e @ @ -z e @ E n n e t that the elastic insulating body (11 @) on both sides, with incisions Grooves (11 @) @@ rschen @@, in each of which ribbon-shaped electrodes (11) are attached to @ eordne @ that are connected in parallel with those of the other groove. 5. Device according to claim 2, characterized g e @ e n n z e c h -n e t that the elastic insulating body (11 @) consists of one @@ or two strips (143), through the two insulating strips (141) provided with the electrodes (119) to A @ s @ and are held. 6. Device according to claim 5, characterized in that L- e k e n no e i c nn e t that the electrodes (119) on the mutually facing surfaces of the insulating strips (141) arranged sinu. @. E @@@ @@ according to claim 5, characterized in that g o k e @ z e @ e @ - @ @ @, de Elek @ talk (119) to the ei @@ nder a @ ge @@@ dte @. S @ @@@ @@ of each insulating strip (141) are arranged. . E @@@ e @ do one of the preceding @@ sayings, @@ @@ rc @ @ notices that the elastic insulation - @@@@ er (@ 1) is made of a foam, Schaumgu @@@ or @. bes @ e @ t. . E @@@ @@@ according to claim l, thereby g e k @ n n z e i e n- @ e, @@@ the ladder @ emente themselves jew @ ils by an e @@@@ Le @ tlack soaked, elastic deform @ aren strips (1 @@), mostly made of a cellular polymer material are. @@. E @@ direction according to claim 9, characterized in that g e k e n n z e @ e h -n e t that the two strips (145) preferably through their length an insulating strip (141) are provided at a distance. 1@. Einri @ ntun @ according to claim 9 or 10, characterized in that g e k e n n -z e i c n n e t that the conductive elastic strips (146) at @@ ren facing away from each other Sides are provided with tape-like connection electrodes (148). 12. Device according to one of the preceding claims, characterized not indicated, since the insulating strip (141) is made of an elastic material, such as foam, foam rubber or the like. Is. 13. Device according to one of claims 1 to 11, characterized g e k e It is noted that the insulating strip (141) consists of a solid body. 14. Device according to one of the preceding claims, characterized in that g It is not noted that the signal transmitter (111) is an elastically deformable one Hollow profile (129), for example made of rubber, is embedded. 15. The device according to claim 14, characterized in that it g e k e n n z e i c h -n e t that the elastically deformable profile (129), in particular on its fastening side, essentially the shape of one used in pneumatic safety devices Hose owns. 16. Device according to claim 14 or 15, characterized in that g e k e n n -z e i c h n e t that the elastically deformable profile (129) has a sealing lip (133). 17. Device according to one of claims 14 to 18, characterized g e k It is noted that the elastically deformable profile (129) has an approximately rectangular shape first Hoh @ -raun (128) for receiving a signal transmitter which is also rectangular in cross section (111) owns. 18. Device according to one of claims 14 to 17, characterized o e i e n Ii z e 1 c h n e t that the elastically defor @ - @ are profile (129) in the direction the effect of the trigger pressure behind the signal transmitter (111) a second elastic, preferably has a hollow trailing area (136). 19. Device according to one of claims 14 to 18, characterized e - k It is noted that the elastically deformable profile (129) is relatively stiff is.