ES2583357T3 - Electrical connection of a safety switching device - Google Patents

Abstract

Safety switching device with at least one switching chamber (3) with at least two switching surfaces which, in case of contact, activates a switching signal that is transmitted to an evaluation unit, the switching surfaces being connected by the end of the switching zone by means of a plug (21) to two switching lines (25) and placing the plug (21) at the end on the switching chamber (3) and fixing it in the switching chamber ( 3), characterized in that the support part (29) is inserted in the end zone of the hollow profile of the switching chamber (3), because the support part (29) has at least one threaded channel (30a, 30b ) that interacts with a threaded hole (28a, 28b) of pin 21 and why a screw is screwed through the threaded hole (28a, 28b) into the threaded channel (30a, 30b).

Description

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DESCRIPTION

Electrical connection of a safety switching device

The invention relates to a safety switching device with at least one switching chamber with two switching surfaces which, especially in case of a contact caused by deformation of the switching area, activates a switching signal that is transmitted to a unit of evaluation, the switching surfaces being connected by the end of the switching area by means of a plug to respectively a switching line and plugging the plug by the end onto the switching chamber to engage it in the switching chamber. The invention also relates to an assembly procedure for a safety switching device of this type.

A safety switching device of these characteristics is known from US 2001/0017587 A1. This safety switching device is designed for a car window. The safety switching device has been designed in the form of an upper rubber profile that is in the window opening and which, in the event of imprisonment, stops the electrically operated moon from the corresponding window. For the establishment of an electrical connection with the safety switching device, a plug is provided that can be connected at one end to the safety switching device. To do this, the plug can be inserted with a connector in the safety switching device. The plug can have two stirrup-shaped terminals in the connector area which, in the inserted state of the connector, must prevent the plug from leaving the safety switching device.

From GB 2 323 214 A, a similar safety switching device is known which also has a plug that can be inserted unilaterally with a connector into the safety switching device. The plug is connected to connection cables that can be short-circuited through a resistor.

Document DE 200 13 310 U1 shows a switching strip in which a contact component can be inserted. Once the contact component is inserted in the switching strip, a forming ring is placed on the switching strip in the area of the contact component, which finally deforms in a plastic manner. For eventual disassembly of the contact component it is necessary to leverage and remove it.

EP 0 539 887 A2 describes a needle contact element for a contact rail that can be mounted in the electrically conductive area of a contact rail rib. The needle switching element has, opposite to an insertion tip, a fitting for the connection of an electric cable.

The aim of the invention is to provide an improved safety switching device against the state of the art, especially as regards the duration and operation of the electrical connections. It is also about proposing an assembly procedure for a safety switching device of this type.

This objective is achieved by the fact that a support piece is inserted into the final hollow profile area of the switching chamber, because the support piece has at least one threaded channel that interacts with a threaded hole in the plug and why a Screw is screwed into the threaded channel through the threaded hole. The plug can be plugged into the switching chamber of the safety switching profile for the establishment of an electrical connection and locked in the switching chamber. A plug like this considerably simplifies the establishment of an electrical connection with the switching area. A connection like this, for example, can be made and, where appropriate, also separated, at any time and place without further auxiliary means, unlike a weld joint. In a general embodiment variant, the plug is configured so that it has contact surfaces that interact with the switching surfaces of the switching chamber. Since the plug also fits into the switching chamber, a firm, tight, durable joint is created. With regard to the duration, for example in the face of an adhesive bond that can show signs of detachment over time, this union is clearly better. The safety switching profile preferably has on one side, then the switching chamber, a hollow profile of an elastomeric material and, on the other hand, a fixing area. However, within the scope of the invention the switching chamber can also be performed independently or combined with other functional components. The support piece, which functionally collaborates with the interlocking pin, has an outer contour that corresponds, at least approximately, to the inner contour of the switching chamber. This ensures, on the one hand, that the switching chamber maintains in all circumstances its original contour in the area in which the support piece is inserted, for example in the event that a very tight housing of the plug Compress the switching chamber or switching surfaces. On the other hand it is achieved by means of a union between the plug and the support piece, which will be explained later, a secure and durable fixing of the plug in the safety switching profile. Preferably, two threaded channels are provided in the support piece and in the corresponding threaded holes of the plug. The assembly procedure provides that when the screws are screwed into the threaded channels, the support piece inserted deeply into the switching chamber is removed again from the switching chamber until it fits into a bottom wall of the plug housing. In this way the walls of the switching chamber located between the support piece and the housing are increasingly secured in the support piece and the housing thanks to the trapecial shape of the support piece provided according to an improved embodiment variant.

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According to an improved variant of the invention, the safety switching device is intended to be used especially in force-driven installations, such as roll-up doors, roll-up grilles, doors, work and lifting platforms, etc.

In a preferred improved variant of the invention, the plug has pins that can be introduced into electrically conductive areas of the switching surfaces. These pins are specially made of a non-corrosive metal, for example stainless steel, tin, nickel or other similar material, are preferably cylindrical, but they can also be, for example, slightly conical, the tip of the cone being able to be arranged, for an introduction more simply, in the conductive areas on the opposite side of the plug or, for a good grip, in the electrical areas on the side facing the plug.

In another variant embodiment of the invention, the plug is connected to the switching line. The switching line has two insulated switching wires attached to the pins, for example by welding. The free end of the switching line is especially connected to a safety device that assumes that a rolling shutter door is closing, for example, against an obstacle and that the switching surfaces come into contact with each other due to at a deformation of the switching chamber, which triggers a switching signal, for the closing movement of the rolling door and reopening the rolling door. However, the switching line can also be connected with its free end to a second pin for the connection of two safety switching devices.

In another variant embodiment, the pins are connected to a resistor. A plug configured in this way is plugged into the switching chamber as a terminal opposite to the wired plug with a switching line. With this element the switching surfaces are electrically connected to each other in a defined manner, it being possible that in case of deterioration of one of the switching surfaces, for example, the safety device assesses and detects an interruption of the switching surfaces. This function is performed independently of the detection of a dangerous situation caused by mutual contact of the switching surfaces.

In the context of the invention, it is also provided, for example, to connect two pins directly to each other for the formation of an angular piece for the connection of two safety switching devices. Other combinations can also be carried out.

In an improved variant of the invention, the plug has a housing containing the end of the switching chamber. This housing establishes, as an interlock, a close connection with the switching chamber and especially prevents the penetration of dirt of any kind and / or liquid into the hollow profile of the switching chamber.

In an improved variant of the invention, the support piece is configured, at least in a partial area, in a trapezoidal manner, the support piece being introduced with the wide trapezoidal base in front of the switching chamber. Thanks to this configuration and arrangement, a particularly reliable fixing of the plug in the safety switching profile is possible, as will be explained later. Instead of the trapezoidal configuration, which preferably comprises all the longitudinal and transverse sides of the support piece, a conical configuration or a configuration that narrows conically can also be chosen.

In another variant embodiment, or as an alternative, the plug or its housing can be made inside of a trapezoidal or conical narrowing, specifically in reverse of the corresponding trapecial configuration or of another form of the support piece. That is, the narrowest cross section of the wall is disposed adjacent to the bottom wall of the plug. As a result, a firm and impermeable joint (to liquids) is obtained between the plug and the safety switching profile which, in terms of durability and tightness, is more reliable than, for example, an adhesive joint. In this way the electrical connections are also protected in a particularly durable way.

Alternatively, the support piece can be made in the form of one or several plugs inserted in the switching chamber and opened respectively by means of a screw that is screwed into the plugs through the threaded hole. When the studs are opened, the interlocking of the components occurs. The corresponding assembly procedure preferably provides that the plug, the plug and the screw are pre-assembled and that the pre-assembled unit is placed on or inside the switching chamber and then secured.

Another alternative provides that the support piece and the plug are configured in one piece. For example, an elastic mass (of rubber) is provided in at least some partial areas of the inner part of the plug, which on the one hand is attached to the bottom wall of the plug and, on the other hand, to a plate . After placing the plug thus configured on the switching chamber or, with the support piece, inside the switching chamber, the plate is drawn towards the bottom wall of the plug by at least one screw screwed into the plate through a threaded hole of the plug, thereby deforming the elastic mass to produce an interlocking with the walls of the switching chamber. However, other means and devices for this interlocking are also provided within the framework of the invention. All the variants of realization have in common that the plug is firmly attached (also in case of application of traction forces) and impervious to the switching chamber, but that in case of necessity it can also be disassembled by loosening the screw . If this is not necessary or not desired, at least one of the screws can be locked to prevent loosening. In this case, it is also possible to replace the screw with a cord as a self-tie cable tie. He

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Cord is fixed on the support piece, while the threaded hole is configured as a self-locking passage hole.

In another perfected variant of the invention, a cap covering the area of inertial rotation is fixed on the pin. With this hood the area of inertial rotation is effectively protected against the penetration of dirt, the hood also offering a nice optical aspect of this end of the safety switching device. The hood covers the area of rotation by inertia, so as to ensure an air circulation between the interior space of the zone of rotation by inertia and the environment. Possible deformations of the inertia rotation zone are not prevented in any way.

In a perfected variant of the invention the hood is hooked into the plug. This method constitutes a particularly simple union possibility. For security switching devices of different configurations, for example, different layers can be mounted that all have a switching camera configured in the same way.

Other advantageous embodiments of the invention can be deduced from the description of the drawings in which the embodiments of the invention depicted in the figures are described in greater detail.

It is shown in

Figure 1 a section of a safety switching profile to which a plug, a support piece and a cap can be attached;

Figure 2 a side view of a plug according to the invention;

Figure 3 a view on a plug according to figure 2;

Figure 4 a view on a support piece for the plug;

Figure 5 a side view of a support piece according to figure 4;

Figure 6 a view on a hood;

Figure 7 a side view of a hood according to Figure 6 and

Figure 8 shows a perspective view of a safety switching profile with the support part mounted, as well as with a plug and a hood in a mounting preparation position.

Figure 1 shows a safety switching profile 1 configured in the form of a hollow profile that has a fixing zone 2 followed by a switching chamber 3 and then an inertial rotation zone 4. The safety switching profile 1 It has been made of an elastomeric material, for example of a rubber material.

A switching element 5 that forms the first switching surface and is manufactured in one piece with the wall of the fixing zone 2 has been inserted through the inner surface separated from the fixing area 2 of the switching chamber 3. switching element 5 has been made so wide that it occupies the entire interior wall of the switching chamber 3. The switching element 5 differs from the rest of the wall in that, due to the addition of conductive materials, it is electrically conductive. A wire 6a is also inserted to improve the conductivity. More or less in the center of the switching element 5, projections 7 have been molded as a flange or ribbon which, seen in cross-section, are shaped like a clover and extend along the switching element 5 in the form of dipstick. On the opposite wall of the switching chamber 3 a switching strip 8 is inserted which forms the second switching surface, made in a piece with the wall and also configured electrically conductively by the addition of conductive materials. In the switching strip 8, a bulge-shaped protuberances 9 have been molded which are developed next to the projections 7 and have approximately the same height as the section with the projections 7. In the switching strips 8, a strip is also inserted electrically conductive wire 6b.

In the switching element 5, tubular thickening 10 protrudes 10 protruding next to the protuberances 9 of the switching strip 8 in the direction of the opposite switching strip 8. These tubular thickenings 10 serve to ensure safe contact with the protrusions 9, especially if the switching chamber 3 bends or moves laterally. The thickens 10 have their greatest height near the protrusions 9 and then go down. However, they can also be developed through the switching chamber 3 in a flat manner, that is, at the level of a cross section. The thickening 10 can also have its maximum height further away from the protuberances 9 in the switching strip 8, specifically so that they are distanced from the wall of the switching chamber 3. In this way, a secure contact between the thickening is also achieved. 10 and the bumps 9.

The outer width of the switching chamber 3 corresponds approximately to that of the inertia rotation zone 4. However, the switching chamber 3 has a lower height (internal extension between the fixing zone 2 and the inertial rotation zone 4), while the zone of rotation by inertia 4 is clearly more than double high.

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The side walls of the switching chamber 3 also bend in the form of an arc and are much thinner than the adjacent side walls of the inertia rotation zone 4 made essentially straight. In the curved arc-shaped side walls of the switching chamber 3, notches 11 are provided on their inner faces that have a cross-section in the form of a primitive circle and cause greater elasticity of the side walls of the chamber of switching 3.

In the zone of inertia rotation 4 struts 12 are provided in the form of a strip oriented diagonally extruded in one piece with the zone of rotation by inertia 4 that provide a reinforcement of the zone of rotation by inertia 4 and a precise transmission of the forces to the switching chamber 3, so that especially the forces acting laterally or obliquely on the inertial rotation zone 4 are transmitted by the respective strut 12 and led to the curved wall of the switching chamber 3.

To further improve the flow of force, reinforcement strips 13 corresponding to approximately two thirds of the height between the coupling points of the struts 12 can be arranged on the side walls of the inertial rotation zone 4. this configuration and conformation of the walls of the switching zone 3 and of the inertial rotation zone 4 especially good conditions are obtained for rapid activation of the switching pulses.

By extending one of the walls of the inertial rotation zone 4, a sealing skirt 14 can be formed. The sealing skirt 14 is disengaged from the wall of the inertial rotation zone 4 due to the fact that both sides are provided notches 15 and 16, whereby a defined cross section is obtained for joining the sealing skirt 14 to the wall of the inertial rotation zone 4.

In addition, a mounting strip 17 is provided which, by means of projections 18, fits into lateral grooves 19 of the fixing area 2. By the outer surface of the wall facing the projections 18, they are arranged between the fixing area 2 and the switching zone 3, ribbed ribs 20 that reach the projections 18 and supporting the switching zone 3, so that the tubular thickening 10 has a rear support on the projections 18. The mounting strip 17 is fixed in the installation to be secured, for example by screwing it.

Figure 2 shows a side view of a pin 21 that can be placed on the end of the switching chamber 3 of the safety switching profile 1. Figure 3 shows a corresponding view on the pin 21 in its inner zone. The plug 21 is made of a plastic material and has a housing 22 in whose bottom wall 23 two pins 24a, 24b are inserted. The pins 24a, 24b are joined to a switching line 25 that leaves laterally from the housing 22. The pins 24a, 24b can be joined alternately through a resistor. The pins 24a, 24b are so long that they protrude from the housing 22. The housing 22 has an inner contour 26 corresponding to the outer contour of the switching chamber 3. Pin 21 overlaps with the housing 22, as will be explained later in in relation to figure 8, in the switching chamber 3 until the outer walls of the switching chamber 3 fit the inner bottom wall 23 of the housing 22. During the overlapping process the pins 24a, 24b are introduced into press on the wires 6a, 6b and establish an electrical contact between the switching line 25, the switching element 5 and the switching strip 8.

Pin 21 also has terminal fixing grooves 27a, 27b on the outer wall on the side of the switching line where a cap can be fitted, which will be described later. In the bottom wall 23 two threaded holes 28a, 28b are finally made through which the screws for coupling to a support piece can be passed, which will also be explained below.

Figure 4 shows a view on the support piece 29 and Figure 5 a corresponding side view. The support part 29, also made of a plastic material, is introduced into the hollow profile area of the switching chamber 3, as shown in Figure 8. The support part 29 has an outer contour largely adapted to the inner contour of the switching chamber 3, especially of the switching element 5 and the switching strip 8. The support piece 29 also has two threaded channels 30a, 30b into which the screws for fixing the pin 21 are screwed In prolongation of the threaded channels 30a, 30b the support piece 29 has two appendices 31a, 31b also provided with threads. The support part 29 is inserted, with the protruding appendages 31a, 31b in front, into the hollow profile area of the switching chamber 3. The support part 29 is further configured (on the side oriented towards the switching element 5 ) in the form of a trapezoid, the wide trapezoidal base being arranged on the side of the appendices 31a, 31b. The support piece 29 is inserted, with the protruding appendages 31a, 31b in front, into the hollow profile area of the switching chamber 3 approximately so deeply that it is outside the contact area (through the area of hollow profile) with the side walls of the pin 21 placed below. The plug 21 is placed on the hollow profile area until its adjustment to the bottom wall 23. When the plug 21 placed on the switching chamber 3 is then screwed on the support piece 29, the support part 29 is it is removed from the hollow profile area of the switching chamber 3 until it also fits the bottom wall 23 of the housing 22 of the pin 21. In the extraction process the trapecial configuration of the support piece 29 causes a clamping and increasing compression of the elastic walls of the switching chamber 3 between the support piece 29 and the side walls of the housing 22 of the pin 21. In this way the pin 21 is firmly and imperviously attached to the profile of safety switching 1.

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Figure 6 shows a view on a hood 32 and Figure 7 the corresponding side view. The cap 32 is made of a rubber material and is placed on the area of one of the sides of the inertial rotation zone 4. The cap 32 has an inner contour corresponding to the outer contour of the inertial rotation zone 4. The bottom of the hood 33 shrinks, starting from a central area towards the side walls of the hood 32, approximately to the center of the side walls of the hood, as can be seen especially in Figure 7. This configuration serves to make the cap can also be deformed without problems in case of a deformation of the inertia rotation zone 4. At the same time the switching line 25 can be installed without problems. For the internal fixation in the inertia rotation zone 4, the cap 32 has three souls 34 that rest on the inner wall of the inertial rotation zone 4. Finally, the cap 32 has, on the side facing the pin 21, two fixing flanges 35a, 35b which They can be inserted in the fixing slots 27a, 27b. Between the two fixing flanges 35a, 35b the cap 32 has no side wall. As a consequence, in this zone an air-impermeable union is not established, but only a dust-tight union with respect to the interior of the inertial rotation zone 4, whereby the air can circulate without problems in case of a deformation of the area of rotation by inertia.

Figure 8 shows a somewhat simplified perspective view of the safety switching profile 1 with the support piece 29 inserted in the junction zones of the switching chamber 3. It is also shown that in the junction zones of the switching chamber 3 with the adjacent fixing zone 2 and the inertial rotation zone 4 are cut or milled, for example, grooves 36a, 36b. These slots 36a, 36b allow the placement of the pin 21 on the switching area 3 for which the side walls of the pin 21 are inserted into these slots 36a, 36b.

The pin 21 and the cap 32 are placed on the safety switching profile 1, as represented respectively by means of an arrow, the fixing flanges 35a, 35b being introduced into the fixing grooves 27a, 27b. Finally, the pin 21 is fixed on the support piece 29 with two screws not shown and the support piece 29 is removed from the safety switching profile 1 until it fits to the bottom wall 23 of the pin 21 to establish a waterproof fastener.

 Reference List

 one

 Safety switching profile 24a, 24b Pin

 2

 Fixing zone 25 Switching line

 3

 Switching chamber 26 Internal contour

 4

 Inertial rotation zone 27a, 27b Fixing groove

 5

 Switching element 28a, 28b Threaded hole

 6a, 6b

 Thread 29 Support piece

 7

 Outgoing 30a, 30b Threaded Channel

 8

 Switching strip 31a, 31b Appendix

 9

 Extrusion 32 Hood

 10

 Thickening 33 Hood Cap

 eleven

 Notch 34 Soul

 12

 Strut 35a, 35b Fixing flange

 13

 Reinforcement strips 36a, 36b Slot

 14

 Shutter skirt

 fifteen

 Notch

 16

 Notch

 17

 Mounting strip

 18

 Outgoing

 19

 Groove

 twenty

 Ribbed strip

 twenty-one

 Plug

 22

 Case

 2. 3

 Background wall

Claims (11)

5 10 fifteen twenty 25 30 35 40 1. Safety switching device with at least one switching chamber (3) with at least two switching surfaces which, in case of contact, activates a switching signal that is transmitted to an evaluation unit, connecting the switching surfaces by the end of the switching zone by means of a plug (21) to two switching lines (25) and the plug (21) being placed at the end on the switching chamber (3) and fixing it in the camera of switching (3), characterized in that the support piece (29) is inserted in the end zone of the hollow profile of the switching chamber (3), because the support piece (29) has at least one threaded channel (30a , 30b) which interacts with a threaded hole (28a, 28b) of the pin 21 and by which a screw is screwed through the threaded hole (28a, 28b) into the threaded channel (30a, 30b). 2. Safety switching device according to claim 1 for force-driven installations such as roll-up doors, roll-up grilles, doors, lifting and working platforms and the like. 3. Safety switching device according to claim 1 or 2, characterized in that the plug (21) has pins (24a, 24b) that are introduced into the electrically conductive areas of the switching surfaces. 4. Safety switching device according to claim 3, characterized in that the pins (24a, 24b) are connected to the switching line (25). 5. Safety switching device according to claim 3, characterized in that the pins (24a, 24b) are connected to a resistor (). 6. Safety switching device according to any of the preceding claims, characterized in that the plug (21) has a housing (22) surrounding the end of the switching chamber (3). 7. Safety switching device according to any of the preceding claims, characterized in that the support part (29) has an outer contour that corresponds at least approximately to the inner contour of the switching chamber (3). 8. Safety switching device according to any one of the preceding claims, characterized in that the support piece (29) is configured at least in a trapezoid-shaped partial area and that the support piece (29) is inserted with the Wide trapezoidal base in front of the switching chamber (3). 9. Safety switching device according to any of the preceding claims, characterized in that a cap (32) covering the area of inertial rotation (4) is fixed on the plug (21). 10. Safety switching device according to claim 9, characterized in that the cap (32) is held in the plug (21). 11. Mounting procedure for a safety switching device according to any of the preceding claims, with at least one switching chamber (3) with at least two switching surfaces that in case of contact activate a switching signal that is transmitted to an evaluation unit, the switching surfaces being connected by the end of the switching zone by means of a plug (21) to two switching lines (25), characterized in that the support piece (29) is inserted in the area end of the hollow profile of the switching chamber (3), because the plug (21) is placed on the end of the switching chamber (3) and finally the support piece (29) with the pin (3) it is held to establish a firm and waterproof interlock between the plug (3) and the safety interlock device (1).