DE19617740C1 - Device for switching off the motor drive of electrically powered blind - Google Patents

Abstract

The device has a switching element which acts against an adjustable spring force on a switch which closes the motor current circuit and forms a rotation element coupled to the coupling element via which the motor drives the blind. The torque acting on the switching element when the blind reaches its end position, or when the motor is blocked at any position, opens the switch. The device contains a double switching element arrangement contg. dual switches and springs acting in opposite senses. The roller shaft (13) has an associated rotation stop in the fully deployed position of the blind (14), which causes an increased motor (24) torque demand .

Description

The invention relates to a device for drive shutdown of awnings, awning isolates and. the like, So from opening covers or shading, the windable surface - the awning cloth - although train forces, but can not transmit pressure forces.

The invention is based on EP 0 534 894 A1. This document describes devices accordingly the preamble of claim 1 of the present invention. Such a known device is suitable indirectly for torque-controlled end or malfunction shutdown of shutters, roller doors or the like unrollable surface elements that both tensile forces can also transmit pressure forces. For the engine circuit when retracting the awning cover are prin basically the same conditions as for pulling up  hen a roller shutter. Additional considerations are required the final shutdown of an extended awning fabric.

In this regard, the invention uses accordingly EP 0 534 894 A1 the tension of the awning fabric in the extended position of the folding arm awning and strikes in addition a special switch arrangement in front of the egg ner of the two switches an NC contact and the on their switch both an NC contact and one Has normally open contact, the normally closed contacts are connected in parallel so that each NC contact temporarily clocks the function of the other NC contact can take over.

Starting from a common basic principle, ent speaking the preamble of claim 1 present Invention, are to shut down shutters, Roller gates or the like on the one hand and awnings or the like on the other on the other hand, two different shutdown devices necessary.

Except for awnings that have articulated arms, wel tensile tension not inconsiderable on the awning fabric exercises that are used for the limit switch there are also awnings. at them this is not possible, at least not to the same extent is. These include simple vertical awnings and Mar isolates. The latter is perpendicular Awnings with a lower, at an angle to the outside tiltable display part. To switch off the lower one The deployment position of such facilities would not be the one intended for roller shutters, roller shutters or the like, in  The switch-off device described in EP 0 534 894 A1 also describes the other direct arm awnings to use.

The present invention is now based on undertook to point out a way that for roller shutters, Rolling gates or the like. suitable and specific surfaces that can be wound up and unwound Switch-off device (the so-called "shutter shutdown") according to EP 0 534 894 A1, that is to say the device which only one switch each with an NC contact calls for immediate shutdown of the on drive motor of all kinds of awnings - folding arm awnings, Vertical awnings, awning isolates or the like - also in the Extend position to be able to use this without direction itself would have to be specially adapted.

The solution to this problem is in claim 1 give and characterized by that the winding shaft at almost or completely Renem awning fabric immediately a rotation is ordered, which gives the engine a higher torque demands.

The principle of the invention is therefore based on for the torque-controlled shutdown of the extension the winding shaft of such an awning Way to hinder that the engine torque increases. This leads to the application of a counter torque over the engine mount onto the the torque arm forming switching element of the shutdown device with the in the case of roller shutters or the like. known sequence of shutdown  in the event of an intermediate or final opposition stood up when lowering.

The awning fabrics typically lack missing properties The ability to transmit pressure forces is specified in ge chic for the purpose of using a simple Chen torque cut-off replaced by that Rotation of the winding shaft so hampered or inhibited that the motor consequently needs to be switched off counter torque on the switch-off device wearing.

After a very well-suited further education the This basic principle consists of a rotation obstruction with the winding shaft rotating and axial screw movable, pre-adjustable end stop. It is on drives for marquettes on the market that are above sol screw spindle running in the winding shaft have blows. These are very easy to get into represent and have the purpose in the case of systems which have several such marrow isolates include ensuring that all marcisolettes, e.g. B. on the same floor or at the entire facade of a building, in the sense of an speaking appearance same extension and Show installation position. Also this "hiking stop" useful to make a readjustment if the awning fabric lengthened over the course of the operating time and this changes the awning extension position Has.

In this regard, it is the merit of the invention that to have recognized that this, completely different goal  directional, stop in excellent Way is suitable for switching off the torque by means of one per se lowered for the limit switch Roller shutters, roller shutters or the like direction to be used.

Attachments that do not (yet) have such a stop directions, can be equipped with it or possibly even retrofitted and with the "roller shutter scarf tion ", with which the double effect of off Fallagen attitude on the one hand and the simple Endab circuit to the other can be achieved. Execution is without except for vertical awnings and awnings can also be used with articulated arm awnings.

With regard to articulated arm awnings, however characterized in particular by the fact that the tension springs the articulated arms impose additional forces on the system or increased engine power are required to like them to move in, the invention proposes a special easy way to use the "roller shutter-Ab circuit ", which consists in the fact that the rotating obstructions Formation of the awning fabric itself, the Extension length is dimensioned so that the cloth is still (slightly) bent articulated arms is tightened.

With articulated arm awnings, the articulated arms may not be stretched, otherwise they won't come back would buckle. In the maximum extension position of the Awning covers are übli on the winding shaft Usually one to one and a half turns of the Mar kisentuch. In the case of the present invention  dispense with this excess cloth: the Mar kise "in the piping". Is this position he is enough, the engine is immediately (i.e. not yet ge stretched articulated arms) by continuing to turn the Wind the awning fabric in the opposite direction again roll up and retract the awning. There at the latest at those arise within the meaning of the invention wanted forces that the necessary counter torque exercise on the "shutters shutdown" and to drive shutdown.

This problem solution according to the invention also has the beneficial side effect of saving relatively expensive awning cloth.

The invention is described below in the Exemplary embodiments shown in the drawings explained further. The drawings show:

Figure 1 is a front view of a shutdown device according to the present invention.

Fig. 2 shows the view according to Fig. 1, partially broken away to make visible in FIG. 1, not visible parts,

Fig section line a section designated by the apparatus of Fig. 1 taken along the III-III there with. 3,

Fig. 4 is a schematic representation of a with schraubbeweglichem end stop and the switch-off device for a winding device is provided (not shown) awning cloth,

Fig. 5 is a schematic representation of an articulated arm awning with extended and tightened Mar kisentuch, and

Fig. 6 is a schematic representation of the arrangement of the shutdown device on the winding shaft.

The generally designated 10 device according to Fig. 1 to 3 is based on a circular base or mounting plate 11 with only about 85 mm ⌀, with bolt apertures 12 for lateral attachment next to the winding shaft 13 for an awning fabric 14 with respect attached to an awning bracket in a fixed position.

On the preferably made of a die-cast base plate 11 , a switching element 15 is pivotally mounted about a small circumferential angle about the central axis 16 . The switching element 15 is assigned a stop 17 which is fixed, preferably integrally-materially connected to the base plate 11 . Stop 17 and switching element 15 are fen through by a screw, the head of which is designated 18 . Between the screw head 18 and the stop 15 , a compression spring 19 penetrated by the screw shaft is clamped - here in the form of a compression coil spring, but instead of the z. B. could be provided a plate spring assembly. Consequently, the switching member 15 is against the action of the spring 19 on the fixed and fixed stop 17 of the base plate 11 . The spring force can be adjusted within certain limits by adjusting the screw.

To the switching element 15 and connected to this one piece each include a bearing plate 20 and an impact 21 , which will be discussed further below. The bearing plate 20 serves to hold two opaque switches 22 and 23 , which are each designed as openers and keep the circuit closed when the switching element is pressed. If the switches 22 , 23 are actuated in the sense of the invention, their contacts open and interrupt the circuit to the drive motor 24 . The actuator 25 for the first located on the bearing plate 20 switch 22 is attached to the base plate, mainly immediately formed on it.

A second switching element 26 interacts with the stop 21 . This also exists in the game Ausführungsbei on a metal die-cast part and is inserted with a central bearing pin 27 in the central bore 28 of the first switching element 15 with rotational movement play. On the side opposite the journal 27 , the switching element 26 has an internal polygon 38 for the pluggable coupling for rotary driving with the polygon (square) on the motor side. The switching element 26 is in principle a (pivotable) one-armed lever, which is supported against the stop 21 against the action of a helical compression spring 30 (or a plate spring assembly). Here too, the spring 30 is penetrated by a spring-force adjusting screw ( 31 denotes the head) which engages in the stop 21 .

The switching member 26 is mounted across the switch 23 on the bearing plate 20 switch net zugeord 22nd The switch actuator 32 is formed in the Darge illustrated embodiment of the end leg of a substantially L-shaped - broken away in Fig. 2) bracket 33 which is integrally attached to the switching member 26 .

Looking to the FIGS. 1 and 2 it can be seen that the compression spring 19, the switching member holds 15 in the clockwise direction against the stop 17, wherein the switching member of the switch 22 is held against the on the base plate 11 befindli chen stop 25. This corresponds to the switch position not actuated; the circuit to motor 24 is closed. At the same time, the spring 30 presses the switching member 26 in the counterclockwise direction against the stop 21 and the Schaltbetäti supply leg 32 against the switching element of the switch 23rd This also corresponds to the unactuated switch position in the sense of closing the motor circuit.

In order to maintain this "normal state" (closed contacts of both switches 22 and 23 ), since the stop 21 against which the spring 30 presses the switching element 26 is part of the pivotable switching element 15 , the force of the spring 30 must be less than the spring 19 . This is very practical to set up, because the switching element 15 with the stronger spring can be assigned to switch off the upper end position of the awning (retracted position), in which the higher (switching) forces occur anyway.

The function of the switch-off device is understood as follows: If a counter torque arises on the motor square due to an increased motor torque, this is introduced into the switching element 26 via the internal polygon 29 .

If this counter torque, which is assumed to exert forces which exceed those of the springs 19 and 30 , is oriented clockwise with respect to FIGS. 1 and 2, the switching element 26 is pivoted clockwise, and the switch 22 by removing the Switch actuator 32 is actuated, which then interrupts the circuit to the motor 24 , which leads to the immediate drive shutdown. The second switching device has not moved here.

Is the counter torque with reference to FIGS. 1 and 2 directed counterclockwise moves the ver pivoting switching member 26 due to pressurization of the stop 21, the switching member 15 with, and the scarf ter 23 is led away from the base-fixed switch actuation stop 25 with the result that he is now pressed more and the circuit to the motor 24 öff net. In the assignment of the switch 23 to the actuating member 32 , nothing has changed, since the switch 23 is mounted on the bearing plate 20 connected to the switching element 15 .

In each of the two directions of rotation of the drive motor 24 , the motor circuit can be interrupted in this way and the drive can be stopped as soon as the torque exerted by the motor 24 via the motor square and inserted into the inner square 29 of the switch-off device 10 is the respective preloaded spring 19 or 30 stretches even further. The correspondingly necessary forces or moments always occur at the end of retracting an awning cover as soon as, for example, the drop bar, which is attached to the end of the awning cover, strikes an obstacle.

In order to achieve a torque-controlled limit switch of the drive motor even when the awning cover is extended, according to the invention the winding shaft 13 is immediately assigned a rotation obstruction in the case of a fully or nearly extended marki cover 14 , which requires the motor 24 to have a higher torque, which is required in the switch-off Expressed against the torque of the square motor.

According to a first embodiment, the Drehbe hindrance consists of a co-rotating with the winding shaft 13 and axially screw-movable, presettable end stop, which can also be referred to as a "moving rotary stop". Fig. 4 shows the principle.

Close to one end of the tubular winding shaft 13, the drive motor 24, a so-called. Tubular motor, is introduced and out infected before that end of the winding shaft 13, the cut-off device 10 to the motor spindle. In the other end of the winding shaft 13 , an end stop device is housed. It includes a Ge threaded spindle 35 whose outwardly projecting end 36 is held in a non-rotatable bearing, not shown. Inside the winding shaft 13 , a fixed and also non-rotatable stop 3 is attached to the threaded spindle 35 . On the threaded spindle 35 , an adjustable end stop 38 is screw-mounted like a traveling nut. This end stop 38 is now axially movable in the direction of the spindle 35 , but is non-rotatably held in the winding shaft 13 . If this rotates, the end stop 35 moves, depending on the direction of rotation of the winding shaft 13 in one or the other direction along the thread despindel 35 .

It is assumed that the end stop 38 moves to the right towards the fixed stop 37 when the awning cover 14 is extended. Then the initial position of the end stop 38 on the spindle 35 , that is, the initial distance of the end stop 38 from the fixed stop 37 , has been set once, so that when the stops 38/37 run against each other, the awning failure has the desired length or position has reached. The motor 24 can 13 does not continue to rotate the winding shaft Now, it operates with an increased torque or blocked and passes into the motor spindle and therefore in the shut-off device 10, a counter-torque one, which leads to the activation of the switch-off device 10th

The switching mechanism by means of end stop 38 is known per se in the case of awnings, but can also be easily integrated into the winding shafts 13 of vertical awnings or folding arm awnings.

To limit the drive of articulated arm kisen the invention, however, proposes a special solution, which is to be explained in particular with reference to FIG. 5. FIG. 6 shows, similar to the left part of FIG. 4, the assignment of the shutdown device 10 to the winding shaft 13 or to the tubular motor 24 .

In a conventional manner, an articulated arm awning has a mounting 39 for the winding shaft 13 to be mounted on the building and at least two articulated arm arrangements 42 each consisting of an upper arm 40 and a forearm 41 . By means of a usual Kederbe fastening 43 , 44 , the awning fabric 14 is attached to the winding shaft 13 on the one hand and, on the other hand, to a drop bar or a drop tube 45 mounted on the outer end of the forearm. The rotary obstruction provided according to the invention for the torque-controlled drive switch-off, which is directly associated with the winding shaft 13 , is now formed by the awning fabric 14 itself. For this, the extension length of the awning fabric 14 as be measured, that the cloth 14 is stretched taut in at least yet sufficiently bent hinge arms, the Marki sentuch 14 thus "in the piping runs". This can be seen clearly from FIG. 5.

Already by the "driving into the piping" arise so large forces due to the tensile forces of the awning fabric 14 that the motor 24 is a higher torque abver, which leads to the switching reaction of the switching device 10 . In any case, the test of the motor 24 would be enough to roll up upon further rotation of the winding shaft 13, the awning fabric 14 to the shaft 13 again, because then in addition, the clamping forces of the articulated arms 42, which must work against the engine rotational moment effectively.

Claims (3)

1. Device for switching off the drive by means of a coupling member, such as polygon, in a torque-acting motor bearing motor suspended motor electrically operated awnings, awnings and. Like. By means of a switching element which acts against the action of a spring adjustable in its restoring force on a switch closing the circuit of the motor acting the torque arm, which is coupled to the coupling member to carry along, the -. B. as a result of reaching an end position, other inhibition or the like. - blocked motor or when reaching an adjustable tensile force of the awning fabric acting on the switching element torque actuates the switch (vented) and the device comprises a double switching element arrangement in which Switches and an adjustable springs double - each acting against each other - are available, characterized in that the winding shaft (13) is associated with an entirely or almost driven awning fabric ( 14 ), a rotation obstruction is assigned to the motor ( 24 ) higher torque is required. 2. Device according to claim 1, characterized in that the rotation hindrance consists of a co-rotating with the winding shaft ( 13 ) and axially screwing union, pre-adjustable end stop ( 38 ). 3. Apparatus according to claim 1, characterized in that the rotation hindrance of the awning fabric ( 14 ) itself is formed, the extension length is be measured so that the fabric ( 14 ) is still (slightly) ge bent articulated arms ( 42 ) is tightened .