EP1102910B1 - Spring monitoring device - Google Patents

Abstract

An arrangement for monitoring a condition of a counterbalance torsion spring in an overhead door or gate and preventing the door or gate from accidentally slamming shut or dropping too rapidly when the spring fails. The arrangement includes a drum mounted on a shaft which transmits the torque of the spring to the drum. During normal operation a sensor and release assembly maintains a catcher in a inactive position and when the spring fails, the sensor and release assembly allows the catcher to move to an active position and engage a grabber disposed on an inside surface of the drum to block rotation of the drum and therefore movement of the door or gate.

Description

The invention relates to a spring monitoring device for a biased operated Spring of a gate, a door or the like, especially for a Weight compensation spring for a one- or multi-part movable head Door leaf or a roller door curtain provided torsion spring, to prevent the Slamming or falling of the door or gate leaf or the like, with an in In the course of the opening and closing movement of the door leaf or the like together with one loaded by the unbroken spring Torque transmission element - especially a cable or chain pull shaft or similar torsion shaft - blocking element rotatable about an axis of rotation, which is used to block this rotary movement and thereby the movement of the Door leaf or the like via a toothing in particular Detection device is preferably positively detectable and blockable, one Interceptor that comes from an operating position in which it is from the detection device is solved, can be moved into a catch position in which it is the detection device detected for blocking the door leaf or the like, and a tension sensor Tripping device for sensing the spring tension of those to be monitored Spring and triggering the movement of the catch member from the operating position in the Snap position in response to one detected via the voltage sensing Spring break.

Such a spring monitoring device is known from EP 0 151 427 A1 and the latter corresponding patent specification known, on the two disclosure content explicit and full reference is made.

The known spring monitoring device is used in a practical application mainly to break one up to balance a balance movable door leaf provided on a shaft for a traction means such as a torsion spring attacking a cable pull the door leaf crashing prevent. Especially with very heavy door leaves, e.g. multi-unit industrial gates, significant torques can be absorbed. So Some spring monitoring devices must be designed to withstand torques of to withstand over 800 Nm and a spinning of the cable shaft on which this Torques can attack due to the gravity of the gate To block.

The previous solutions are based on the fact that a wave is included in the scope Pawl teeth provided ratchet wheel is set in which a pawl as Can snap into the blocking member. In the operating position, the pawl against a spring preload acting in the direction of the ratchet wheel held a bolt. The bolt is part of a tension sensing and Tripping device that the tension of the torsion spring to be monitored monitors and the bolt in the event of spring breakage for movement from the detection with the Pawl releases and triggers it. The bolt is preferably directly with this a spring seat for the torsion spring - usually in the form of a spring cone - connected and is captured by the preload of the torsion spring in the Pawl pressed. With one already with some spring break protections for In addition, the spring cone is realized in an industrial version Angular range around a swivel axis offset parallel to the axis of rotation pivotable so that the bolt one of the circumferential direction about the axis of rotation can perform various swivel movements and so easier from the Area of influence of the pawl is movable to trigger the same.

For the voltage sensing and triggering device there are also various other training courses possible, for example electrical, electropneumatic or pneumatic type, at which the voltage sensor instead of as a mechanical link e.g. as a strain gauge or pressure sensors or the like can be formed.

US Pat. No. 5,697,476 discloses a braking mechanism for braking a garage door Failure of a counterbalance mechanism known with a drum-shaped Braking element on one with respect to the axis of rotation when the door leaf moves rotating torsion shaft radially inward wall with a Toothing detection device is provided, and with a catch member, that from an operating position in which it is detached from the detection device into a Start position is movable, in which it is the detection device for braking the Door leaf detected, and the one radially inside the inward wall arranged, in the course of the movement in the catching position radially outwards in the Detection with the detection device movable catch section has. It is as Pawl trained catch attached to the torsion shaft and radially inward spring-loaded elastically biased and against it away from the detection device directional bias movable by centrifugal force towards the detection device. The Braking element is held by means of a fixed to the outer circumference of the Brake drum designed brake elements guided brake loop can be braked.

The previously known spring monitoring devices have the disadvantage that they are relative take up a lot of space and material, especially when there are high Torques a large radius for the ratchet wheel or the like blocking element is desirable is and accordingly a correspondingly more complex catch element is necessary If access from outside is to be excluded, there is also a housing for It is necessary to enclose the known blocking devices (catch element and blocking element).

The object of the invention is to provide a spring monitoring device of the type mentioned in the introduction to further develop that it takes up less space and preferably less material and nevertheless a blocking of high torques occurring in the event of spring breaks allows.

This task is accomplished by a spring monitor with the features of Claim 1 solved.

According to the invention, the blocking element is thus part of a traction mechanism drum on which another end with the door leaf or the like preferably at its closed position connected lower means is held windable, and preferably integrally formed with the same. The blocking element is therefore not a separate component more, but can be integrated into an existing traction roller. The invention Spring monitoring device is e.g. can also be fully integrated inside the traction roller, i.e. completely enclosed by this. In particular, the traction drum or role itself e.g. in the form of a kind of ratchet ring gear as a blocking element or usable. This is a corresponding to the spatial conditions of the rope drum or the same traction drum large ratchet wheel with a large radius created. This brings a large lever arm with respect to the torsion axis. Another big advantage this invention. Design lies in the extremely short force path. When catching the flow of force from the gate or the like goes via the traction mechanism to the traction mechanism drum and from there directly onto the catch member, which has the power to support it derives. The force flow is therefore in the spring monitoring device according to the invention not on the torsion shaft. It would be if the torque transmission from the spring is otherwise realized on the traction mechanism drum, also an embodiment without the torsion shaft conceivable.

Advantageous embodiments of the invention are the subject of the dependent claims.

In a spring monitoring device designed according to the invention, this Blocking element directed essentially radially inward with respect to the axis Wall on which the detection device is formed and has the catch member a radially arranged inside the inward wall or can be arranged, in the course of the movement into the catching position radially outward into the Detection with the capture device movable catch section.

In contrast to the additional component known from EP 0 151 427 A1, on its circumference with ratchets or the like provided ratchet wheel is here described blocking element provided in its interior with the detection device, in which engages the catch member with an outward movement when the spring breaks. With the same detection radius, the catch element can be much smaller and less material than be trained in the prior art. A low-mass catch member also has the Advantage of lower inertia, so that faster blocking is possible. Besides, is the blocking device formed from the blocking element and catch member in the inner region of the Blocking element relatively well protected against access or external influences, so that no separate housing needs to be provided for this purpose. This is According to the invention further provided that the blocking element as a ring section, as Pot-shaped, preferably accessible from the outside hollow housing or as a drum is trained.

Preferred because independent of external energy such as compressed air or electrical voltage, the catch element is mechanically designed, the Catch section on a radially outward with respect to the axis of rotation, in particular spring-loaded, pre-tensioned pawl for detecting at the radially inward wall to form the detection device protruding ratchet teeth is formed.

To quickly and safely release the blocking device in the event of a spring break ensure, it is further preferred that the catch member is provided with a support surface is in the operating position to support a broken spring the tension sensing and triggering device from the trajectory of the Catch member movable holding element is used and so in relation to the direction of movement of the retaining element is inclined obliquely that the latter at Release after spring break by moving the catching element into the catching position is pushed out of the trajectory. So e.g. as catcher one pivotable outside of a serving as a torque transmission element Traction shaft mounted pawl used as in the prior art one on the spring cone, which is also pivoted outside the shaft attached bolt used as a retaining element held in the operating position is, only a transverse component of the pretensioning force of the pawl is applied applied this bolt, in such a way that the pawl on the not Support surface on the bolt running perpendicular to the pawl pivot point is applied. Breaks the spring and moves the spring cone with the bolt over the intended angular range around its swivel axis in the final locking position, this movement is supported by the ratchet pretension.

Thus, in an even more preferred embodiment of the invention, the catch member is around a lever axis offset parallel to the axis of rotation, into which Catch position spring-biased lever element with a first, the Lever arm having catch section and in particular forming the pawl educated. If, in addition, the lever element has a second lever arm, the to interact with the trigger mechanism of the voltage sensing and Tripping device is used, in particular has the support surface is the Available space is more usable and it can be used to trigger the Blocking device usable movements are redirected. The second lever arm serves the purpose of e.g. a spring cone movement in the event of spring break, preferred as described in such a way that a small component of the Pawl preload force on an inclined plane (the support surface) on the Bolt of the cone acts.

In the event of a broken spring, it can happen that the trigger mechanism, i.e. the Example of the bolt attached to the spring cone or another Holding device or the other holding element not only in his or her Release position but also kicked back or bouncing back becomes. So that such a rebounding trigger mechanism once released cannot reach the second lever arm again, this is preferably such trained that he in the catch position when moving the lever element entirely from the sphere of influence of the trigger mechanism, in particular from the Path of movement of the retaining element, pivots out.

It is further preferably provided that the lever element is mounted such that the first lever arm in the catch position by the movement of the to be blocked Door leaf or the like is resilient to pressure. Such one is under pressure Lever arm offers further advantages compared to a ratchet lever loaded under tension in terms of material savings, since a barb element like it on a train loaded ratchet lever would be necessary is avoided. Instead of such a can simply the free end of the lever arm as an engagement area for gripping the pawls be trained.

In a further embodiment of the invention with regard to this first lever arm preferred that the first lever arm designed as a pawl has a locking lug for gripping one of the ratchet teeth, the locking nose with a bevel is provided, which after the pivoting of the lever element Spring break glides over a complementary bevel on the ratchet tooth, whereby the lever element can be guided into the final catch position before a significant torque is transmitted. As a locking nose that can Catch section forming free end of the first lever arm itself, or this free end can be, for example, in the form of a bent part have formed locking lug.

The configuration with the complementary bevels is particularly important its advantageous that the traction device drums are often made of die-cast a material that is more prone to breakage than sheet metal, for example. It is therefore advantageous if the forces that are really to be absorbed are possible first in the case of a large-scale intervention between the locking nose and the corresponding one Pawl tooth flank can be initiated. That is why the latter moves advantageous embodiment of the invention, the detection device on oblique flank of the tooth, the correspondingly obliquely formed locking nose first radially outwards to the ratchet tooth base, so that you have a large Contact surface between the locking lug and the ratchet tooth flank by means of a corresponding Slip feed achieved. This is particularly advantageous in connection with a pressure resilient lever arm, because with a lever arm resilient to tension, the bevel should be made so inclined on the ratchet tooth flank that in In extreme cases the rupture strength of the ratchet teeth could suffer.

The one carrying (or forming) the detection device pointing radially inwards Incidentally, the wall does not have to be present throughout, it can be with Breakthroughs may be provided or only in a partial area of the circumference of the blocking element can be provided. The wall does not have to be exactly geometrical sense radially inward. It can e.g. everywhere with Pawl areas should be provided so that they are not a single perpendicular to the radial has directed area piece. It is important that they are essentially or in its entirety is directed inward that the trained Detection device is accessible from the radially inside.

Instead of a constantly radially inside the inward wall arranged catch section, a catch section can also be provided, whose rest position in normal operation e.g. axially offset outside of the wall enclosed area, but at least in the course of Trigger movement can be arranged in this area, so in the course of Release movement in this area and in relation to the The rotational movement axis is moved radially outward into the detection position.

Fig. 1

eine Prinzipdarstellung, die eine entlang der Linie A-B-C-D-E-F von Fig. 2 geschnitten dargestellte Ansicht eines seitlichen Endbereichs einer mit einem Federüberwachungsgerät versehenen Torsionsfeder-Torblattgewichts-Kompensations-vorrichtung darstellt,

Fig. 2

eine Prinzipdarstellung der Vorrichtung nach Fig. 1 in einer Querschnittsansicht entlang der Linie G-I-H in Fig. 1,

Fig. 3

eine Draufsicht auf ein in der Vorrichtung nach Fig. 1 als Fangglied verwendetes Hebelelement, und

Fig. 4

eine Vorderansicht des Hebelelements von Fig. 3.

An embodiment of the invention is explained below with reference to the accompanying drawings. It shows:

Fig. 1

2 shows a basic illustration which shows a view of a lateral end region of a torsion spring door leaf weight compensation device provided with a spring monitoring device, cut along the line ABCDEF from FIG. 2,

Fig. 2

1 shows a basic illustration of the device according to FIG. 1 in a cross-sectional view along the line GIH in FIG. 1,

Fig. 3

a plan view of a lever element used in the device according to FIG. 1, and

Fig. 4

3 shows a front view of the lever element from FIG. 3.

Fig. 1 gives the one side end portion of a torsion spring door leaf weight compensation device again, such as with a roller shutter or a sectional door is used. One for compensation is shown of the door leaf weight serving preloaded torsion spring 1, the torque is transmitted to a cable drum 3 via a torsion shaft 2. Not that one shown) door leaf hangs with its weight on a rope 4, which on the Rope drum 3 is held windable. To support the torsion shaft 2 is a Shaft holder 5 provided. The torsion spring 1 on her, not shown Is connected to the torsion shaft 2, sits, as shown, with its other, the end facing the cable drum 3 on a cone 6. Except for The axis of rotation A of the torsion shaft 2 is the cone 6 by means of a first bolt 7 a parallel to the axis of rotation A parallel pivot axis Ak pivotally mounted. With respect to the axis of rotation A of the torsion shaft 7, the first pin 7 A second bolt 8 is arranged opposite to the cone 6 and in a curved slot 9 (see FIG. 2) in the shaft holder 5 in such a way led that the cone 6 around a small angular range Can pivot pivot axis Ak. The torsion spring 1 tensions the Cone 6 in such a way that the second bolt 8 fixed to a first end 10 of the Elongated hole 9, as shown in Fig. 2, abuts.

The cable drum 3 is connected to the torsion shaft 2 for common rotation, e.g. it is flying or as in the manner explained in more detail below. On an area accessible from the side facing the torsion spring 1 its radially inner wall 11 has a detection device 12 which a plurality of ratchet teeth 13 arranged circumferentially distributed, each with one in Unwinding direction of rotation Ra, i.e. in the direction of rotation of the cable drum 3, in which they are Closing the door leaf while unwinding the rope 4 is rotated, directed to seen in the radial direction has beveled ratchet tooth flank 14.

To block the cable drum movement in the event of a spring break, a catch element is used Lever element 15 is provided. The lever element 15 is by means of a third bolt 16 pivoted about a lever axis Ah, which is also offset and parallel to the axis of rotation A. A spring element 17 clamps the lever element 15 in a catch position (not shown) in which it is the on the cable drum 3rd provided detection device 12 detects the cable drum 3 blocking, i.e. the lever element 15 is opposite in the illustration of FIG. 2 in the pivoting direction biased clockwise. The lever element 15 has - as best from its separate representation in FIGS. 3 and 4 - a first Lever arm 18 and a second lever arm 19 running at an angle to it on.

The first lever arm 18 has a (see FIG. 4 in connection with FIG. 1) with a Catch section acting, protruding into the interior of the cable drum 3 Barrier 26 provided free end 20. In the example shown is the end 20 bent so that only the bent part forming the locking lug 26 into the Rope drum 3 extends into it, but the rest of the lever element 15 axially outside the Cable drum 3 is arranged. One pointing against the unwinding direction Ra Edge of the free end 20 (the locking lug 26) is with a bevel 21 provided, which are designed complementarily corresponding to the ratchet tooth flank 14 is.

The second lever arm 19 is designed such that it in the in the figures shown operating position (the rope drum 3 is without detection by the lever element 15 freely rotatable) on the first by the torsion spring 1 End 10 of the slot 9 held second bolt 8 abuts. This is also the free end 22 of the second lever arm 19 bent, in that on the Torsion spring 1 directed axial direction. So is on the lever axis Ah facing side of the bend 23 a support surface 24 for supporting the second lever arm 19 and thus the entire lever element 15 against the Bias is formed by the spring element 17 on the second bolt 8. The However, as shown, support surface 24 does not exactly point to lever axis Ah, Rather, it is designed to run obliquely so that it looks like a crooked one Plane is supported on the bolt 8 and the same with a transverse component of the Spring force of the spring element 17 against its abutment at the first end 10 of the elongated hole 9 applied.

The lever element 15 also has a third lever arm 25, which for Handling the lever element 15 between the shaft holder 5 and the Rope drum 3 protrudes.

For the rotationally fixed connection of the torsion shaft 2 and the cable drum 3 are on both of these elements 2, 3 groove regions 27 and 28 formed into the Closure element in the form of a stop wedge 29 or the like is driven. In addition to preventing a relative rotation of the elements 2, 3, the Wedge formation of the closure element 29 also for jamming the elements 2, 3 in such a way that relative displacements are prevented. In addition to this is the cable drum 3 with a clamping screw 30 to prevent displacement the torsion shaft 2 provided.

The shaft holder 5 is for mounting the torsion shaft with a pressed Ball bearing 31 provided.

For further explanation and for alternative training, especially the one here parts of no interest, the torsion spring door leaf weight compensation device will expressly refer to the number 0 151 427 published European published application.

During normal operation of the torsion spring door leaf weight compensation device transmits the torsion spring 1 its supporting force via the bolt 7 and at the end 20 of the elongated hole 9 bolt 8 on the shaft holder 5. This is the Cable drum 3 biased against the unwinding direction Ra; the one on the rope 4 the weight of the door leaf is compensated. That the latter is easy move between the open and closed positions, with the rope 4 rotating the cable drum 3 is wound up or unwound accordingly. The lever element 15 is in the operating position by the second bolt 8 as a retaining element held.

Without a device for monitoring the torsion spring 1 would break if Torsion spring 1 load the full weight of the door leaf without a counter bearing on the rope 4, and it would crash at full force in the event of a broken spring. To a To prevent the door leaf from falling in the event of spring breakage is the case here Torsion spring door leaf weight compensation device on one of the lever element 15 and the detection device 12 comprising blocking device and one the cone 6 in connection with the slot 9, 10 and the bolts 7 and 8 Spring monitoring device formed voltage sensing and triggering device intended. The voltage sensing and tripping device 6-10 feels a constant contact with the torsion spring 1 Spring voltage drop same immediately and releases the blocking device 15, 12 to Blocking an unwinding movement of the cable drum 3 and a falling movement of the door leaf.

If the torsion spring 1 breaks, the cone 6 is released for this purpose moves jerkily within the predetermined by the slot 9 Angular range around its pivot axis Ak. As a result, the second bolt 8 comes out its detection with the first end 10 of the elongated hole 9 and moves in the Elongated hole 9 away from this end 10. This movement is caused by the creation of the Lever element 15 over the support surface acting as an inclined plane for the bolt 8 24 and the bias of the spring element 17 still supported until the support surface 24 gets out of contact with the bolt 8. Then moves the lever element 15 driven by the spring element 17 into its catch position. The second lever arm 19 swings completely out of the area of the elongated hole 9 and thus the area of influence of the trigger mechanism having the bolt 8 to release the blockage, so that even a rebound of the Trigger mechanism does not trigger the movement of the lever element 15 once triggered disturbs. In the further course of this movement of the lever element 15 from the Operating position in the catching position, the bevel 21 is at the free end 20 of the first lever arm 18 in contact with one of the complementary Bevel trained ratchet tooth flanks 14. Due to the bevel 21 matching course of the ratchet tooth flank 14, this pulls the first Lever arm 18 radially outwards so that the lever element 15 is driven by a kind of "inclined plane detection" of the ratchet tooth flank 14 and the Bevel 21 (there are also pivotal or lever movements curved or curved forms of the "bevels" conceivable and provided) and finally by the spring element 17 in its catch position emotional. In this, the free end 20 of the first lever arm 18 is supported by the Bevel 21 on the ratchet tooth flank and over which the bevel 21 bearing edge on the ratchet tooth base over a large area on the detection device 12, i.e. on the inward wall 11 of the cable drum 3 and blocks the latter, the then fully occurring torque load directly from the cable drum 3 and their teeth over the first loaded under pressure Lever arm 18 and the third pin 16 is transmitted to the shaft holder 5. The The path of the flow of force in the catching situation is therefore very short. In particular, the force to be dissipated not via the torsion shaft 2. The short force flow path also bears to a quick undelayed response. Plus, fewer will be Parts loaded, so that the spring monitoring device more reliable than previous ones Systems works.

So some things work together in the embodiment shown here, to be particularly small, yet with a relatively large ratchet arm and to be able to work safely and extensively with regard to the force to be introduced, without rebounding the breaking torsion spring once can inhibit triggered lock intervention.

Zum Bilden eines Geräts zum Überwachung einer insbesondere zum Gewichtsausgleich für ein Torblatt oder dergleichen vorgesehen Feder (1) wird ein Federüberwachungsgerät vorgeschlagen, bei dem ein radial nach außen beweglicher Fangabschnitt (18) eines Fangglieds (15) bei Bruch der Feder (1) in eine an einer radial nach innen weisenden Wandung (11) eines sich mit der Öffnungs- und Schließbewegung des Torblatts oder dergleichen drehenden Blockierelementes (3) ausgebildeten Erfassungseinrichtung (12) blockierend eingreift. Vorteilhafterweise wird als Blockierelement eine ohnehin vorhandene Zugmitteltrommel (13) verwendet, bei der die Erfassungseinrichtung (12) an einem vorzugsweise von außen zugänglichen Bereich einer radial inneren Wandung (11) ausgebildet ist.

Important aspects of the spring monitoring device described here are summarized again below with reference to the illustration in FIG. 1:

In order to form a device for monitoring a spring (1) provided in particular for weight compensation for a door leaf or the like, a spring monitoring device is proposed, in which a catch section (18) of a catch member (15) that is movable radially outwards in the event of the spring (1) breaking into a on a radially inwardly facing wall (11) of a blocking device (3) formed with the opening and closing movement of the door leaf or the like, blocking device (12) engages in a blocking manner. An already existing traction mechanism drum (13) is advantageously used as the blocking element, in which the detection device (12) is formed on a region of a radially inner wall (11) that is preferably accessible from the outside.

LIST OF REFERENCE NUMBERS

1

torsion spring

2

torsion

3

cable drum

4

rope

5

shaft Supports

6

cone

7

first bolt

8th

second bolt

9

Long hole

10

first end of the elongated hole

11

radially inner wall

12

detector

13

ratchet tooth

14

Ratchet tooth flank

15

lever member

16

third bolt

17

spring element

18

first lever arm

19

second lever arm

20

free end of the first lever arm

21

bevel

22

free end of the second lever arm

23

bend

24

supporting

25

third lever arm

26

locking tab

27

Groove area in torsion shaft

28

Groove area in rope drum

29

stop wedge

30

clamping screw

31

pressed-in ball bearing

Ah

lever axis

ak

Swivel axis of the cone

A

Axis of rotation of the torsion spring

Ra

Direction of rotation for unwinding the rope

Claims (10)

1. A spring monitoring device for a pre-tensioned driven spring of a gate, a door or similar, especially for a torsion spring (1) configured as a weight compensation spring for a one- or multipiece overhead doorleaf or a reinforced roller door, to prevent said door or door leaf, or similar, from slamming shut or dropping,
   with a blocking element (3), acted upon by a torque transmission element - especially a cable or chain hoist shaft or similar torsion shaft (2) - during the opening and closing movement, via the unbroken spring, and rotatable about a rotational axis (A), this blocking element being preferably formlockingly holdable and blockable to block this rotational movement, and thus the movement of the door leaf, via a holding apparatus (12) which especially has toothing,
   a catching member (15), which can be moved from an operating position in which it is released from the holding apparatus (12) in which it holds the holding apparatus (12) into a catching position in order to block the door leaf or similar, and
   a tension sensing and triggering apparatus (6-10) to sense the spring tension of the springs which are to be monitored and to trigger the movement of the catching member (15) from its operating position as a reaction to a breaking spring which is detected by the tension sensor,
   characterised in that the blocking element is surrounded by a traction means drum (3) on which traction means (4), another end of which are attached to the lower area of the door leaf, or similar, in its closed position, are held in a windable manner, and is preferably itself configured as such.
2. A spring monitoring device according to claim 1, characterised in that the blocking element (3) has a wall (11) directed substantially radially inwards with regard to the rotational axis, on which the holding apparatus (12) is configured, and that the catching member (15) has a catching section (20, 26) which is disposed or disposable radially within the inwardly-directed wall (11) and which can be moved radially outwards during the movement into the catching position so that it holds the holding apparatus (12).
3. A spring monitoring device according to claim 2, characterised in that the blocking element is configured as a ring section, as a pot-shaped hollow housing, preferably accessible from outside, or as a drum (3).
4. A spring monitoring device according to one of claims 1 to 3, characterised in that the catching section (20, 26) is configured on a detent pawl (18) which is pre-tensioned elastically, especially in a spring-loaded manner, directed radially outwards with regard to the rotational axis (A), to hold ratchet teeth (14), projecting to form the holding apparatus (12) from the wall (11) which is directed radially inwards.
5. A spring monitoring device according to one of claims 1 to 4, characterised in that the catching member (15) is provided with a supporting surface (24) which serves, when in the operating position, to support against a bracing apparatus (8) which can be moved from the path of movement of the catching member (15) by the tension sensor and triggering apparatus (6-10) in the event of a broken spring, and is inclined obliquely with regard to the direction of movement of the bracing element (8) in such a way that the latter is pressed, on activation after breakage of a spring, into the catching position by movement of the catching member (15), from the movement path of the catching member (15).
6. A spring monitoring device according to one of claims 1 to 5, characterised in that the catching member is configured as a lever element (15), spring-elastically pre-tensioned into the catching position, swivellable about a lever axis (Ah) which is offset parallel to the rotational axis (A), with a first lever arm (18) which has the catching section (20, 26) and which especially forms the detent pawl.
7. A spring monitoring device according to claim 6, characterised in that the lever arm (15) has a second lever arm (19) which serves to work in conjunction with the triggering mechanism of the tension sensor and triggering apparatus (6-10) and especially has the supporting surface (24).
8. A spring monitoring device according to claim 7 and especially claim 5, characterised in that the second lever arm (19) is configured so that on movement of the lever element (15) into the catching position, it swings entirely out of the area of influence of the triggering mechanism, especially out of the path of movement (9) of the bracing element (8).
9. A spring monitoring device according to one of claims 6 to 8, characterised in that the lever element (15) is mounted so that the first lever arm (18) can be pressure-loaded in the catching position by the movement, which is to be blocked, of the door leaf or similar.
10. A spring monitoring device according to claim 4 and one of claims 6 to 9, characterised in that the catching section (20, 26) on the first lever arm (18), configured as a detent pawl, has a free end (20), which works as a blocking nose (26) or which includes this, to grip one of the ratchet teeth (13), wherein the free end (20) is provided with a chamfer (21) which slides over a complementary chamfer (14) on the ratchet tooth (13) on swivelling of the lever element (15) after breakage of a spring, whereupon the lever element (15) can be moved into the final catching position before any significant torque is transmitted.

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