DE20309359U1 - Drive device with belt transmission, especially for overhead garage doors, includes continuous free wheel or locking device for maintaining belt tension - Google Patents

Abstract

The free-wheel or locking device (34) used to maintain belt tension is a continuous one. The belt tensioning device (10) includes a first accumulator (32) for supplying tension to a slackening belt and a free-wheel or locking device movable in the tensioning direction in order to maintain belt tension.

Description

The Known door drive has a traction mechanism, the traction means is automatically tightened when the tension decreases. To do this a traction device of the known door drive one or two springs as energy storage for retensioning the traction device tension and a freewheel device in the form of a locking device, the one for that ensures that only a further tightening, but not a loosening of the traction device allows is. The well-known traction device has been found in gate drives proven, is however with regard to the adaptation to different traction means improvable.

Based on the state of the art according to the EP 1 094 245 A2 it is an object of the invention to improve a door drive of the type mentioned in the preamble of claim 1 with regard to the adaptation of the traction means tension to specific traction means.

This Task is achieved by a door drive with the features of the claim 1 solved.

According to the invention Door drive provided with a traction mechanism and a traction device, the first energy storage device for supplying a further-tension force with decreasing tension and a locking in one direction and maintainable freewheel device movable in the other direction which has a clamping force. In contrast to those in the prior art Technology provided with the freewheel device stepped locking device In the invention, the freewheel device is designed continuously.

As Toothed belts and toothed belts are increasingly used in door drives used. With the training according to the invention a slight tension on the different divisions of these timing belts or adjust tooth belts; this has sometimes occurred in the prior art Difficulties because it was difficult to find the rest of the Adapt locking device to the timing belt pitch. The gradually In some cases, the overvoltage is either too large or adjusted traction tension too low, so that the Teeth of Toothed belt or toothed belt were too heavily loaded or too low stress on the teeth a drive pinion skipped to have. Just skipping of teeth of a drive pinion poses a safety problem with gate drives Door drives are usually provided with a safety shutdown, that when the door leaf opens onto an obstacle and the switch off or reverse the resulting load increase. For this purpose, the load on the drive motor is usually recorded. When driving up the force from the door leaf over the Traction mechanism transmissions are transmitted to the drive motor. This is problematic if the tension is too low. Fatal is that in many gate operators the travel path for the purpose of control and control is only tapped on the motor shaft. at Slip in the traction mechanism transmission, as occasionally in the prior art due to mismatching of the traction device tension, which can only be retightened in stages has occurred, the path of the motor shaft is no longer correct with the actual Gate path. With stepless re-tensioning, this does not result in a problem because also the traction tension values between the individual stages are automatically achievable, and thus always the optimal traction tension is automatically adjustable, so slip in the traction mechanism preferably to avoid.

advantageous Embodiments of the invention are the subject of the dependent claims.

Instead of the previous positive engagement between locking lugs and corresponding Counter bearings are preferred here that the freewheel device in the blocking direction by means of frictional locking. A frictional connection allows blocking a return in any position without any steps. Preferably is blocked via a thread engagement. The axis around which the thread engagement is screws, is preferably approximately parallel to the clamping direction and thus also the opposite direction of tension. As a result, the threads run depending on Thread stroke more or less transverse to the clamping direction and thus reinforce the interlocking adhesion between the interlocking Forms threads.

Further it is preferred that the freewheel device is infinitely variable adjusting stop for a leading the traction device, by means of the first force accumulator against the tension of the traction means movable guide element having. The stop is provided such that the guide element through the traction means tension is applied against the stop. On in this way the attack prevents the slackening of the Traction means. Leaves but the traction means tension continues, the stop becomes corresponding continuously adjusted.

A second energy store, in particular a spring, is preferably provided for adjusting the stop. Its driving force can preferably, but need not, be less than the driving force of the first energy accumulator. If the traction device is further tensioned by the first energy accumulator when the traction device tension decreases, the stop is relieved at the same time, which, driven by the second energy accumulator, can be readjusted until it reaches a position in which it is again It is widely burdened that the adjustment force is no longer sufficient for further adjustment. It is preferred that the adjusting stop against the traction device tension can be determined by means of a frictional attack. The frictional attack can arise, in particular, due to the load on the stop due to the increasing tension of the traction means or it can be enlarged.

Around a retreat to prevent the attack safely, it is further preferred that the frictional attack on a thread engagement with itself essentially Threads extending transversely to the tension means. additionally to the rubbing attack then a relative rotation of the threaded elements being detected are used, before the attack withdraws. This results in a substantial reinforcement by force or Frictionally generated counter bearing forces.

In easy to implement and therefore preferred preferred design can the freewheel device through a threaded shaft and one for readjustment Have spring force applied to the nut in the direction of rotation, whereby the thread engagement between the threaded shaft and the nut the tension means tension and loaded by the first energy accumulator is relieved when the traction tension decreases. The threaded shaft can e.g. be provided on a screw, the head of one Tensioner roller holder attacks. Or the tension roller holder is itself provided with a threaded pin area having the threaded shaft. Of course kinematic reversal is also possible, with the threaded shaft with the spring-loaded nut, for example, stationary on a guide rail and a counter bearing for this nut can be provided on a movable tensioning roller holder can.

On embodiment The invention is explained in more detail below with reference to the accompanying drawing. In this shows:

1 a perspective view of a traction mechanism for a garage door drive, with the open side pointing downwards in the intended use, as a rule, pointing upwards here for illustration purposes;

2 a bottom view of the traction mechanism of 1 ; and

3 an enlarged detail view of the end usually facing the door leaf (seen from below) of the traction mechanism of 1 ,

The drawings show one with a traction device 10 provided traction mechanism 12 of a door operator, as is already the case in principle EP 1 094 245 A2 is known. For further details, expressly refer to the EP 1 094 245 A2 directed. The present preferred embodiment of the door drive differs from that of FIG EP 1 094 245 A2 known door drive essentially (only) by a modified design of the traction device 10 , The next to the traction mechanism shown 12 Remaining parts of the door drive such as drive motor, linkage for articulating the door leaf (not shown), control housing, controls and accessories are not shown here, however, and in the usual well-known manner, see also the EP 1 094 245 A2 ,

The traction mechanism 12 accordingly has a guide rail 14 , a drive pinion holder 16 with a drive pinion (not shown in detail) stored therein, a deflection roller holder 18 with a deflection roller mounted in it, only indicated by its axis 20 , one only around the drive sprocket and the pulley 20 guided traction means in the form of a toothed belt assembled into an endless loop 22 , one on the tooth belt 22 drive carriage connected for reciprocation 24 with connection means 26 for the door leaf and a slide protection 28 , a fastening device 30 for fastening the traction mechanism 12 at the lintel above the door opening to be closed (not shown) and the traction device 10 on.

The traction device 10 maintains the tension of the tooth belt 22 automatically upright. By means of the traction device 10 becomes the pulley holder 18 towards away from the drive pinion holder 16 biased. The Zugmittelspannvorrich device 10 has a first energy accumulator in the form of a compression spring 32 for retensioning the tooth belt 22 and a stepless freewheel device 34 or locking device on when retensioning the tooth belt 22 a return movement of the guide roller holder 18 towards the drive pinion holder 16 prevented.

The pulley holder 18 and the pulley 20 form a linearly movable guide element, which is used to maintain and re-tension the traction device tension on the traction device, ie here the toothed belt 22 attacks. The free-wheeling or locking device 34 has a stop 36 by a second energy accumulator, here in the form of a spiral spring 38 is so biased that it moves when the guide member 18 . 20 automatically adjusts continuously in the tensioning direction to move the guide element back 18 . 20 in the opposite direction to prevent. To form the stop 36 is a movable element for adjustment, here in the form of a pulley holder 18 assigned first mother 40 , as well as a counterla element, here in the form of a fixed, the guide rail 14 assigned end plate 52 , intended. It is easy to see that it is for the function of the stop 36 it is irrelevant whether the adjusting element is the movable guide element 18 . 20 and the counter bearing element of the stationary guide rail 14 is assigned, or vice versa, the adjusting element is fixed in place and the counter bearing element is assigned to the guide element. The counter bearing element could also have an adjustment function.

The pulley holder 18 is on the drive pinion holder 16 opposite side with a threaded pin in the form of a screw 42 with threaded shaft 44 Mistake. The screw 42 sits with its appropriately trained head twist-proof in a square opening 46 in a back sheet 48 the pulley holder 18 , The threaded shaft 44 passes through a stationary spring counter bearing, here in the form of a downward strutting, stable tab 48 that are fixed to the guide rail 14 is connected, and the counter-bearing element of the stop 36 , so here on the guide rail 14 trained or arranged end plate 52 ,

On the threaded shaft 44 sits between the tab 48 and the end plate 52 a second mother 54 , The second mother 54 is particularly secured against rotation in any way not shown. The second mother 54 holds a spring seat 56 for the compression spring 32 , The compression spring 32 is so between the tab 48 and the second mother 54 clamped and thus clamps the pulley holder 18 in the tensioning direction. On the thread 44 also sits on the tooth belt 22 opposite side of the end plate facing the camber 52 the first mother 40 , The first mother 40 is thus with the threaded shaft 44 in thread engagement. The longitudinal axis of the threaded shaft runs 44 and thus the screw axis or thread axis of the thread engagement between the threaded shaft 44 and first mother 40 essentially parallel to the clamping direction. When the first mother is loaded 40 by striking them on the end plate 52 is the first mother 40 about the then increased frictional attack between the threads of the mother 40 and the threaded shaft 44 and thus secured against twisting by means of a frictional connection. The first mother 40 therefore prevents as part of the attack 36 effective a return movement of the guide roller holder 18 towards the drive pinion holder 16 out.

The coil spring 38 is between a fixed spring stop device, here in the form of a fixed to the end plate 52 connected or integrally formed therewith, substantially perpendicular from the main plane of extension of the end plate protruding pin 58 , and the first mother 40 clamped and tensions the first mother 40 in such a direction of rotation that, in the unloaded state, it automatically moves towards the deflection roller holder on the threaded shaft 44 further screwed.

The following is the function of the traction mechanism tensioning device described above 10 explained.

In the initial state, the tooth belt is manufactured by the manufacturer 22 optimally biased. The first mother 40 is loaded by the tension of the tooth belt 22 on the end plate 52 on. The coil spring 38 is maximally biased. Due to the load on the thread engagement and due to the counteracting tension, it can be the first nut 40 however do not move. The preload of the compression spring 32 can be about the second mother 54 to adjust. The spring force of the compression spring 32 is generally higher than that of the coil spring 38 , An adjusting force for re-tensioning is in the present embodiment primarily by the compression spring 32 delivered. Leaves the tension of the tooth belt 22 at some point during the use of the door operator, then the compression spring presses 32 the pulley holder 18 further away from the drive pinion holder 16 and so tensions the tooth belt 22 to. Through this movement the first mother becomes 40 relieved. The coil spring 38 turns the first mother 40 until they are back on the end plate 52 stops and so a return movement of the guide roller holder 18 prevented. It is easy to see that this re-tensioning and re-adjustment is completely stepless.

Compared to the previous solution of a traction device 10 with step-by-step adjustment has the stepless tensioning device described here 10 the advantage of a better adaptation to the tension means values actually required. In addition, there are no additional opposing forces when continuing to clamp, whereas previously there was to be overcome additional resistance when driving over ratchet teeth. On the contrary, in the present tensioning device 12 the first energy accumulator is supported by the tension of the second energy accumulator, which adjusts the stop.

In the illustrated embodiment, the tab 48 , the fastener 30 and the end plate 52 combined in one piece to form a structural unit, here as a tensioning plate 60 referred to as. The tension plate 60 is initially slidable in the guide rail 14 added to a simple initial tension of the tooth belt by the manufacturer 22 to allow, and after this adjustment of the tension with self-tapping screws 62 or the like on the guide rail 14 been fixed.

It is therefore a door operator with a train tel transmission ( 12 ) and a traction device ( 10 ), the first energy storage ( 32 ) for supplying a further tensioning force with decreasing traction tension and a free-wheeling or locking device which locks in the opposite tensioning direction and can be moved in the tensioning direction ( 34 ) to maintain the traction tension. In order to achieve a better adaptation than previously to different clamping force values required, for example, because of the tooth pitch of the traction means, it is proposed that the freewheeling or locking device ( 34 ) is stepless.

10

traction means tightening device

12

traction drives

14

guide rail

16

Pinion holder

18

Umlenkrollenhalter

20

idler pulley

22

toothed belt (Traction means)

24

drive carriage

26

connection means for door leaf

28

door security

30

fastening device

32

compression spring (first lift mechanism)

34

stepless Freewheel device or locking device

36

attack

38

spiral spring (second lift mechanism)

40

first mother

42

screw

44

threaded shaft

46

square opening

48

flap

52

end plate

54

second mother

56

spring seat

58

pen (Anchor device for Coil spring)

60

clamping plate

62

sheet metal screws

Claims (10)

Door drive with a traction mechanism gear ( 12 ) and a traction device ( 10 ), the first energy storage ( 32 ) for supplying a further tensioning force with decreasing traction tension and a free-wheeling or locking device which locks in the opposite tensioning direction and can be moved in the tensioning direction ( 34 ) for maintaining the traction means tension, characterized in that the free-wheeling or locking device ( 34 ) is stepless. Door drive according to claim 2, characterized in that the free-wheeling or locking device ( 34 ) locks in the opposite direction by means of a frictional connection. Door drive according to one of the preceding claims, characterized in that the free-wheeling or locking device ( 34 ) in the opposite clamping direction by means of a thread engagement, which preferably has a thread axis running essentially parallel to the clamping direction. Door drive according to one of the preceding claims, characterized in that the free-wheeling or locking device ( 34 ) a continuously adjustable stop ( 36 ) for a the traction device ( 22 ) leading, by means of the first energy store ( 32 ) movable guide element against the tension of the traction device ( 18 . 20 ) in such a way that the guide element ( 18 . 20 ) due to the traction mechanism tension against the stop ( 36 ) is applied. Door drive according to claim 4, characterized in that a second energy accumulator, in particular a spring ( 38 ), to readjust the stop ( 36 ) is provided. Door drive according to one of the preceding claims, characterized in that the adjusting stop ( 36 ) against the traction device tension can be determined by means of a frictional attack. Door drive according to claim 6, characterized in that the frictional attack on a threaded engagement essentially involves itself Threads extending transversely to the tension means. Door drive according to one of the preceding claims, characterized in that the freewheeling or locking device has a threaded shaft ( 44 ) and a first nut for adjustment by spring force in the direction of rotation ( 40 ), the thread engagement between the threaded shaft ( 44 ) and the mother ( 40 ) loaded by the tension means and by the first energy accumulator ( 32 ) is relieved when the traction tension decreases. Door drive according to one of the preceding claims, characterized in that the driving force of the first energy store ( 32 ), especially with a second mother ( 54 ), is adjustable. Traction device tensioning device for a door drive according to one of the preceding claims, with a first energy store ( 32 ) for supplying a tensioning force with decreasing traction tension and a free-wheeling or locking device that locks in the opposite tensioning direction and can be moved in the tensioning direction ( 34 ) to maintain the traction mechanism tension, characterized in that the freewheeling or locking device ( 34 ) is stepless.