DE19956536A1 - Drive arrangement for doors, has pull mechanism, toothed strap for transmitting force, energy accumulator, locking device, tensioning device and catch - Google Patents

Abstract

The drive arrangement (12) incorporates a pull mechanism(10) which has a pull, especially a toothed strap (16) for transmitting force. A tensioning device (26) tensions the pull mechanism and has an energy accumulator (56,57) The blocking device has a snap-in catch arrangement (40,44,42,48) for the stepped tensioning of the pull. The tensioning device has a ratchet arrangement locking and releasing a blocking or free-wheel arrangement (34)

Description

The invention relates to a drive device for driving gates, in particular Garage doors, doors, windows or the like between an opening and one Closed position of movable closures of structures or enclosures, with a Traction mechanism transmission, which is a traction mechanism, in particular a toothed belt, for power transmission and a traction device for maintaining a traction tension of the Traction means comprises, the traction means tensioning device for a force storage element Providing a force that maintains the tension of the traction means. Also concerns the invention a traction device for such a drive device with egg Nem energy storage element for supplying the tension of a traction device to be tensioned Traction maintaining force. Such a drive device and such Traction device tensioning devices are known from EP 0 732 476 A1.

This known drive device is used in particular to open and close a Overhead movable garage doors. This turns a motor driven drive wheel by the traction mechanism in a translational movement a driver that can be connected to the door leaf. This is as a train means a toothed belt is provided, which fits in the drive wheel around it engages laid and is guided at the other end around a pulley. The two ends of the toothed belt are by a coupling device for coupling the driver trained belt buckle connected, so that the traction means a total of endless loop forms. The guide roller is mounted on a guide roller holder. The tooth belt is can be tensioned by a traction device, which has a pulley neck connected bolts, a tension screw, a helical compression spring and a includes stationary bracket. The pulley bracket is in one for guiding the Mit provided provided slidably and over the bolt resilient with respect to the one end of the guide having the fixed holder rail supported. For this purpose, the helical compression spring is on that of the guide roller holder pushed the opposite end of the bolt, the position of the pulley bracket  is adjusted relative to the guide rail via a nut on the bolt is screwed on while storing the helical compression spring.

This traction device tensioning device enables a traction device tension to be adjusted via the Nut adjustable, this traction tension is elastic with the help of the compression spring keep right.

For the correct operation of the drive using the traction device, the rich tractive tension is important. A traction device that is too slack leads to increased vibration and thus u. U. To increased noise by hitting the traction device to the Guide rail. If the tension decreases significantly, it can also lead to a rut the traction device come over the drive wheel, causing damage to the teeth of the traction device cannot be excluded. A too high one set from the start Tension means leads to great mechanical stress.

A disadvantage of the known traction device tensioning device is that the prestressing area closes is small, and the pretensioning of the traction device during the entire period of use of the An To ensure the drive device, maintenance measures such as tensioning the Compression spring or shortening of the traction device.

The invention has for its object a drive device of the aforementioned th type or a traction device tensioning device that can be used therein such that the disadvantages shown above are avoided and a structurally simple and was tion-free traction device is created.

Starting from the drive device, this object is achieved in that the Traction device further a ratchet device or the like in a Rich device blocking and in the opposite direction movable locking or freewheel device summarizes, which is arranged and / or designed such that it is a tension or further tension the traction means by pulling, in particular via a tensioning roller, on the train medium in one clamping direction, but blocks in the opposite direction and that the Force storage element the ratchet, locking or freewheel device in the clamping direction preloaded.

A traction device tensioning device according to the invention is accordingly characterized by a ratchet device or the like blocking in one direction and in the opposite direction  movable locking or freewheel device, which is arranged and / or out is formed that they in particular in tensioning or further tensioning of the traction means by pulling special over to a tension pulley, on the traction means in a tensioning direction, in Ge opposite direction but locks, the force storage element, the creaking, locking or free running device biased in the clamping direction.

These measures ensure that the traction device is automatically re-tensioned can be reached when the tension of the traction device decreases. This is done in a preferred embodiment Post-tensioning gradually. The preload path of the traction mechanism tensioning device can can be designed for any length.

In a concrete form, one is like a ratchet or ratchet that moves in allows one direction, but blocks in the opposite direction, acting device proposed to prevent a reduction in the tension of the traction means. Leave that Tension means z. B. due to aging, the creaking, Locking or freewheel device by means of springs or similar energy stores in tension direction moved on. In doing so, she blocks herself from further slackening of the train tels.

Such a traction device is particularly useful when using tooth straps, which consist of a textile band and attached or provided teeth - for example molded teeth made of plastic or the like - advantageous. Also if such tension belts by special measures such as woven into the textile tall fibers or other reinforcing fibers secured against stretching of the belt due to the constant tensile load on the traction device Closing and opening force of the closure to be moved a permanent (permanent) Never completely rule out stretching. Since such drive devices are very easy Long lifespans can also be achieved without special measures almost never completely rule out slackening of the traction device. Other factors, too a slackening of the traction means - e.g. B. also chain - contribute, for. B. Material removal or other signs of wear on the drive, guide, output or deflection crank dern or roles, their bearings or on the traction itself.

Such drive devices used over the lifetime of traction means Extending expansion of the traction device can be done with the traction device according to the invention Compensate the clamping device automatically. It is also advantageous that the support over  the ratchet, locking or freewheel device can be done and not via a screw compression spring as in the prior art, where this spring is initially a tensile load is pressed before the force is transmitted.

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

So the locking or freewheel device is particularly easy to manufacture if it has one Latching device for gradual further tensioning of the traction device when the tension decreases has tension. In principle, there are various configurations of the ratchet, Locking or freewheel device conceivable. For example, one in a mechanical ratchet used ratchet in the form of a ratchet wheel, wherein the energy storage element z. B. a coil spring, a bar spring or a Rope on a shaft of the ratchet wheel attacking weight or the like can. Other examples for forming such a device would be freewheel hubs, such as they are known from vehicle construction.

But since the traction device tensioning device advantageously in an elongated guide Rail should be accommodated, is preferred for space reasons that the Rasteinrich tion is not circular but linear. According to an embodiment, device of the invention, an abutment element and an elongated detection element, in particular in particular a snap or braces, with a row from the form-fitting one tendency of the abutment trained locking or hook members, in particular Saw teeth on. The elongated detection element can be of any length as the space available allows. Over this length and in particular the length of the row of latching or hooked links can then be Select the tension path over which the traction device can be retensioned. Depending on the type or the expected lifespan of the traction device is expected to have a large elongation a correspondingly long row of locking or hook links must be provided.

The elongated detection element snaps on with the respective latching or hook members the abutment element. One of the two elements - detection element or Wi derlagerelement - is assigned to the traction device to retension and the other of these two elements is then stationary. Advantageously, the the latter storage in such a way that the respective arrangement is selectable. On In this way, a basic setting can be made depending on the local conditions Adjust the mounting location of the drive device. For example, by choosing the  Arrangement of the fixed element use a longer traction device, or the reason the tension of the traction mechanism can be increased or decreased.

To ensure secure locking or capture between the abutment element and detection element is according to an advantageous embodiment of the invention see that the locking device further an elastic element, in particular a spring like a leaf spring, for elastic pretensioning of the abutment element and detection element against each other in the locking position.

The elongated detection element can be used to set a basic setting on its free end with a larger compared to the locking or hook members Impact device for detecting the abutment element provided in an initial stage his. This stop device can, for. B. be such that a relative movement of the both elements against the clamping device not possible beyond the initial stage is. For example, the abutment element with a sheet or a plate an opening formed therein, which opening through the elongate sensing element is reached, the stop device having such an extent, that it cannot be passed through the opening. On the other hand, the public but be designed such that the adjoins the anchor device ß series of locking or hook links through the opening in the next locking step can slide, as shown in the accompanying figures.

So that the latching or hooked members over the opening area forming an abutment the abutment element and the elongate detection element not only be movable relative to each other in the clamping direction, but at least in be limited also in a direction perpendicular to this. This is in a concrete advantageous embodiment of the invention enables that with the traction means connected element of the locking device - abutment or detection element - to egg Nem tension roller holder, on which a tension roller is rotatably mounted, pivotable is directed.

The energy storage element can, as already mentioned, ge in various ways be educated. So would be B. easily pneumatic, hydraulic, pyrotechnic or electrical energy storage conceivable. For reasons of reliability, however, weight or mechanical force storage elements utilizing tension forces are preferred. So downward movable weights or the like would also be conceivable. For space reasons  and because of the simpler installation, it is further preferred that the energy accumulator element at least one spring, in particular at least one helical tension spring points, which biases the ratchet, locking or freewheel device in the clamping direction. In principle, of course, a single tension spring would suffice. Because of the The provision of greater possibilities for distributing forces evenly is little tens of two coil springs advantageous, the one end fixed and the other Are attached to the tensioner pulley end.

In the basic setting, the energy storage element is set so that it generates a force just below the tensioning device tension preset by the factory. Once this Traction means tension decreases by stretching the traction means or the like, that pulls Force storage element the ratchet, locking or freewheel device to the next level. Even a break in one of the springs of the energy storage element would then not come to an end in the case of the drive, since the traction means tension through the lock of the locking device tion is still maintained. This lock also has the effect of the springs the energy storage device is not constantly under maximum voltage, so that a Feather breakage is also little to fear.

The drive device further preferably has a motor in a manner known per se drive unit for driving a drive wheel, wherein the traction means to the drive wheel and is guided around a pulley serving as the tension pulley. The train Then a coupling device is preferably attached to which one to one Wing of the closure, especially on a door leaf - in the case of a garage door operator bes -, connectable, guided in a guide rail for translational movement Driver can be coupled. The deflection roller is then in this embodiment of the invention more preferably connected to the ratchet, locking or freewheel device. The arrangement is such that the ratchet, locking or freewheel device is a mutual Removing the pulley and drive wheel permits - this would cause further tension of the traction means correspond, but against moving the pulley and of the drive wheel locks.

An embodiment of the invention is explained below with reference to the accompanying figures. Therein: Figure 1 is a partially sectional bottom view of a traction drive of a garage door drive with a traction means tightening device in a factory preset initial stage.

Figure 2 is a partially sectioned bottom view of the traction device during a tensioning process. and

Fig. 3 is a view comparable to Fig. 2 of the traction device in an end position.

In Fig. 1, a traction mechanism 10 of a gate drive designated overall by 12 is shown. The door drive 12 comprises a C-profile-shaped guide rail 14 , within which an unillustrated but sufficiently known, coupled to the door leaf can be moved from an open position to a closed position and vice versa. To drive the driver, the traction mechanism 10 has a traction device in the form of a toothed belt 16 , which is placed at one end 18 of the guide rail 14 around a drive 20 mounted in a holder 20 , driven by a schematically illustrated motor drive unit 64, drive wheel 22 . At the other end 24 of the guide rail 14 , the traction mechanism gear 10 has a traction mechanism tensioning device 26 , by means of which the tension of the toothed belt 16 can be set and maintained by moving a deflection roller 28 acting as a tensioning roller.

The toothed belt 16 is guided around the deflection roller 28 at the second end 24 of the guide rail 14 . The two ends 30 , 31 of the toothed belt 16 are connected together in a manner known per se by means of a belt buckle 32 , which serves as a coupling device for coupling the driver. As a result, the toothed belt 16 is closed to form an endless loop, the belt buckle 32 and thus the driver coupled to it and thus the door leaf (not shown) in a first direction and by rotating the drive wheel 22 in that by moving the drive wheel 22 in one direction opposite direction is movable in a second direction.

The traction means tightening device 26 has a Knarren- or locking device 34, which overlapping with the guide roller 28 Umlenkrollenhalter 36 is connected, and a movement of the deflection roller 28 in a clamping direction 38, ie from the drive wheel 22 away, allows in the opposite direction but blocks.

The locking device 34 has an essentially formed by a stationary abutment element 40 and a rack 42 , which can be latched to the abutment element 40 , formed on the locking device. The abutment element 40 is formed by a relative to the Füh guide rail 14 in a selectable arrangement fixable clamping plate 44 , which is net within a fixable in the area of the gate opening (not shown) U-profile piece 43 extending transversely to the longitudinal direction of the guide rail 14 and an opening 45th , through which the rack 42 extends.

The toothed rack 42 is fastened to the deflection roller holder 36 by means of a bolt 46 so that it can pivot about an axis 60 . It has a series of locking or hook members in the form of saw teeth 48 , which are each provided with a start-up shoulder 49 and a detection surface 50 for engaging engagement of the parts of the clamping plate 44 bordering the opening 45 . At the free end, the toothed rack 42 is provided with a flange formation 52 which acts as a stop device and which has a greater transverse extent than the extent of the opening 45 . The saw teeth 48 , on the other hand, are provided with a smaller transverse extent than the opening 45 , so that they can slide with the start-up shoulder 49 over the edge of the opening 45 until the gripping surface 50 engages behind the opening edge.

A leaf spring 54 biases the rack in its detection position with the abutment element 40 , that is, in particular the edge of the opening 45 before.

The traction means tensioning device 26 further comprises an energy storage element formed by two helical tension springs 56 and 57 . The two screw tension fields 56 , 57 are attached at one end to the stationary tensioning plate 44 . With the other end, the two coil tension springs 56 , 57 are fastened to the tensioning roller holder 36 . The tension of the tension springs 56 , 57 is dimensioned such that it is in the initial setting shown in FIG. 1 at the factory set just below the tension of the toothed belt 16 acting counter to the tensioning direction 38 .

The traction means tensioning device 26 thus essentially consists of the toothed rack 42 , which can also be referred to as a step hook, the deflection roller holder 36 , with a connecting pin 59 provided for gripping through the bolt 46 , the leaf spring 54 , the coil tension springs 56 , 57 and the tensioning plate 44 . The rack 42 is pivotally connected to the deflection roller holder 36 by the bolt 46 about the axis 60 .

Due to the closing or opening force of the door to be moved (not shown), the toothed belt 16 is subjected to tension. The toothed belt 16 is thereby stretched in the course of the lifetime of the drive device 12 . Inelastic expansion leads to an extension of the toothed belt 16 .

Fig. 1, the factory-set preload shows the pulling means, that is of the toothed belt sixteenth The set preload is somewhat greater than the tensile force of the two tension springs 56 , 57 . As a result, a detection surface 61 of the flange formation 52 rests on a support surface 62 of the clamping plate 44 that borders the opening 45 .

If the traction tension decreases over time, the tensile force of the screws tension springs 56 , 57 becomes greater than this traction tension. The process that then takes place automatically is indicated in FIG. 2. The coil springs 56 , 57 pull the deflection roller holder 36 further in the clamping direction 38 , the edges of the opening 45 sliding over the starting shoulder 49 of the saw tooth 48 following the flange formation 52 until it has passed through the opening 45 and with its detection surface 50 the support surface 62 engages in the clamping plate 44 . During the sliding of the sawtooth 48 on its start-up shoulder 49 , the toothed rack 42 is pivoted about the axis 60 against the bias of the leaf spring 54 .

When the toothed belt 16 is lengthened to the extent that the tensioning device 26 is further tensioned in the tensioning direction 38 by the double division of the teeth 48 of the toothed rack 42 , the second saw tooth 48 engages on the tensioning plate 44 . The leaf spring 54 always brings the rack 42 - which can also be referred to as a step hook - again in the locked position.

Fig. 3 shows the end position in which the last saw tooth 48 grips the clamping plate 44 .

Claims (10)

1. Drive device ( 12 ) for driving gates, in particular garage doors, doors, windows or the like between an open and a closed position be movable closings of buildings or enclosures, with a traction mechanism ( 10 ) which a traction means, in particular a toothed belt ( 16 ) for power transmission and a traction means tensioning device ( 26 ) for maintaining a traction means tension of the traction means ( 16 ), wherein the traction means tensioning device ( 26 ) has a force storage element ( 56 , 56 ) for supplying a force maintaining the traction means tension, characterized in that
that the traction device ( 26 ) further comprises a ratchet device or the like in one direction blocking and movable in the opposite direction locking or freewheeling device ( 34 ), which is arranged and / or designed such that it tension or further tensioning the traction device ( 16 ) by pulling, in particular via a tensioning roller, on the traction means ( 16 ) in one tensioning direction ( 38 ), but blocking in the opposite direction
and that the energy storage element ( 56 , 57 ) prestresses the ratchet, locking or freewheel device ( 34 ) in the tensioning direction ( 38 ). 2. Drive device according to claim 1, characterized in that the blocking device (34) a latching device (40/44/42/48 ) for incrementally Wei ters span of the traction means (16) with decreasing tensile stress. 3. Drive device according to claim 2, characterized in that the latching device (40/44/42/48 ) an abutment member (40) and an elongated He socket member (42), in particular a detent or rack (42) with a number of for the form-fitting, snap-in engagement of the abutment ( 40 ) formed latching or hook members ( 48 ), in particular saw teeth ( 48 ), the abutment element ( 40 ) or the detection element ( 42 ) being connected to the traction means ( 16 ) for tensioning the same and the other of these two elements ( 40 , 42 ) is stationary, in particular for an adjustable stationary arrangement. 4. Drive device according to claim 3, characterized in that the latching device (40/44/42/48 ) further comprises a resilient member (54), in particular a spring, more in particular a leaf spring (54), for resiliently biasing of the abutment element (40) and / or detection element ( 42 ) in the locking position. 5. Drive device according to one of claims 3 or 4, characterized in that the elongate detection element ( 42 ) at its free end with a larger than the locking or hook members ( 48 ) larger stop means ( 52 ) for detecting the abutment element ( 40 ) in has an initial stage. 6. Drive device according to one of claims 3 to 5, characterized in that the element (42) connected to the traction means (16) of the latching device (40/44/42/48 ) on a tension roller holder (36) on which a tension roller ( 28 ) is rotatably mounted, is pivotally articulated. 7. Drive device according to one of claims 1 to 6, characterized in that the energy storage element has at least one spring, in particular at least one helical tension spring ( 56 , 57 ), which the ratchet, locking or Freilaufeinrich device ( 34 ) in the clamping direction ( 38 ) preloaded. 8. Drive device according to claim 6 and claim 7, characterized in that the energy storage element has two helical tension springs ( 56 , 57 ), each of which is fixed at one end and fixed at the other end to the tensioning roller holder ( 36 ). 9. Drive device according to one of claims 1 to 8, characterized by a motor drive unit ( 64 ) for driving a drive wheel ( 22 ), the traction means ( 16 ) being guided around the drive wheel ( 22 ) and a deflection roller ( 28 ) serving as a tensioning roller and a coupling device ( 32 ) for coupling a traction means ( 16 ), which can be connected to a wing of the closure, in particular to a door leaf, and is arranged in a guide rail ( 14 ) is fastened, the deflecting roller being connected to the ratchet, locking or freewheel device ( 34 ) is connected so that the ratchet, locking or freewheel device ( 34 ) allows a translational movement of the deflection roller ( 28 ) away from the drive wheel ( 22 ), but against a translational movement of the deflection roller ( 28 ) to the drive wheel ( 22 ) locks out. 10. traction means tensioning device for a drive device according to one of claims 1 to 9, with a force storage element ( 56 , 57 ) for supplying a force maintaining the traction means tension of a traction means ( 16 ) to be tensioned, characterized by a ratchet device or the like blocking in one direction and in the Locking or free-wheeling device ( 34 ) which can be moved in the opposite direction and which is arranged and / or designed in such a way that it tensions or further tensions the traction means ( 16 ) by pulling, in particular via a tensioning roller, on the traction means ( 16 ) in a tensioning direction ( 38 ) allows, but blocks in the opposite direction, the force storage element ( 56 , 57 ) pretensioning the ratchet, locking or freewheel device ( 34 ) in the tensioning direction ( 38 ).