DE3301446C2 - Gate operator - Google Patents

Abstract

Gate drive with a drive motor unit for gates or the like, which is connected via a belt drive with a towing device for the door leaf, the belt being guided on the drive side via a belt drive wheel provided on the output shaft of the drive motor and on the output side via a driven wheel, the latter with a drive wheel for the towing device is in gearbox connection, which is provided with a braking device fixed to the housing to prevent a movement that occurs due to the springing back of the door leaf in the opposite drive direction, which engages a gear part between the drive motor shaft and the door leaf and undergoes elastic deformation when the direction of rotation is reversed through a maximum torque.

Description

The invention relates to a door drive with the features of the preamble of claim 1.

Doors that are equipped with such known door drives - DE-GM 78 17 731 -. get with a certain top speed after switching off the drive motor - for example by a corresponding travel-dependent limit switches - in the open or closed position and run in opposite directions there a resistance that, like the entire transmission system, has a certain resilience, so that the gate is inclined, due to a spring back movement a little bit out of the Remove end position in reverse direction of movement. Even if such goals, for example overhead goals, are provided with a counterbalance device, this phenomenon is practically unavoidable, especially not if there is no locking device for this end position of the door leaf movement is provided. As an example, anti-slip elements that act when the door leaf is closed

are beaten, are only mentioned sealing beads

Such an application of the disconnected drive in the reverse direction is then readily possible master when the gear travel from the door leaf to the motor is subject to corresponding resistance, such as which can be the case, for example, when using a worm reduction gear. Simpler ones and in particular drives that can be produced more cheaply, for example with a toothed belt reduction drive

ίο work, however, offer one in the opposite direction to the output direction of movement occurring movement against less resistance, which is why it occurs can that the door or gate leaf from the respective final position reached by a little again moved back and stops in this imperfect end position.

In a known door drive - US-PS 25 88 880 - A belt drive is placed under tension, in such a way that a certain amount of pressure is applied against the force of a spring Locking torque is exerted on the door leaf when it reaches the end division. This measure is relatively complex and requires a corresponding basic conception of the drive. After a Also known proposal - DE-GM 18 27 338 - is to be a ring gear of the with the shaft of the The driving sprocket connected to the electric motor is formed as a spatial spiral rjs, which is formed by a smallest radius after a largest radius and back again, so that with an opening or Closing process run through the entire spiral in one or the other direction of the chain will. Such a solution is positionally complex and involves the entire door leaf movement in the solution to the problem.

It is the object of the invention, even with such drives, due to the springing back of a door leaf or similar movement occurring in the opposite drive direction do not offer sufficient resistance, to prevent such a movement with simple means, so that even one does not fall into a lock latch arriving gate leaf in its respective end reached position persists.

Based on a door drive of the type mentioned with the features of the preamble of Claim 1, this object is achieved according to the invention by its characterizing features.

The braking device provided according to the invention has a brake pad that passes through a maximum braking torque when the direction of rotation is reversed, so that a

5J Backward movement of the drive when the drive is switched off Motor is only possible against an increasing braking torque and is therefore prevented. On the other hand is natural the drive motor strong enough, with a targeted reversal of the direction of rotation, the maximum braking torque the braking device to overcome.

In a preferred embodiment, this braking device takes effect on the driven gear. behind a reduction gear between this output gear and the drive motor is provided. In favor of off guide, it is about a tooth nemcntneb.

The braking device can very simply consist of a holder in which an elastically deformable one Brake pad material is incorporated, for example polyurethane.

Further refinements of the invention emerge from the subclaims in connection with that in FIG Drawing reproduced exemplary embodiment, on

33 Οί 446

which is specifically referred to and the following description explains the invention in more detail. It shows

F i g. 1 is a schematic, perspective view of a gate with a drive of the type in question here Kind;

2 shows a general view of a rope here as Alis guide example selected drag chain drive,

F i g. 3 shows a horizontal section looking towards the chassis part of a motor drive unit in FIG Question in question;

F i g. 4 another design of a brake pad.

To illustrate the area of application of the drive in question, FIG. 1 in perspective view of a single-leaf overhead door when closed, its door leaf 14 in the upper edge area on the right and left with horizontal rollers Guide rails 92 is guided. In the side frame area 93 links 94 are provided, which the door leaf 54 a further measure! to lead.

A towing link 12 is articulated on the door leaf 14 and extends along a path parallel to the guide rails 52 extending retaining rail 2 is guided longitudinally. The towing link 12 is connected to an endless chain 2, around a pulley at the gate end and a drive pinion at the opposite end the holding rail 1 is guided, which is from the Motorantrifcbsaggregat 98 is driven.

The overall view of an exemplary embodiment for such a drive according to FIG. 2 shows, in a rough subdivision, the holding rail 1, along which the chain 2 is guided. The aluminum alloy holding rail 1 is clamped at both ends, on the one hand in a connection part 3 of the housing part 4 (clamping screw 6) which rotatably supports the drive pinion 5 for the chain 2 and on the other hand on a connection piece 7 which connects the pulley 8 for the chain 2 keep rotatable. The connecting piece 7 is connected to a wall mounting plate 10 via a hinge St , so that an exact alignment / u of the wall mounting device 11 of the housing part 4 is not required in the course of assembly. The drag link 12 is fixed to the chain 2 and forms the connection to the door leaf 14 via a drag device designated as a whole by 13.

The motor drive unit designated as a whole with 98 has a housing part 4 and an electric motor 16. via a drive belt 17 and a pulley 18 on the drive sprocket 5 works. Depending on the Umlaufnchtung of the motor 16, the chain 2 is via the Antriebskeaenrad 5 in one direction or the other moves so that the towing member 12 moves in the corresponding direction along the support rail 1, whereby The door leaf 14 is lifted out of the area of the door opening via the towing device 13 or in this is lowered.

In the embodiment according to FIG. 3 is a drive unit shown here only in terms of their is described in the context of the invention essential parts. The electric drive motor, not shown here (16 in F i g. 2) is shown only with regard to its output shaft 23 and indicated by the arrow 31 as marked such a motor that can be operated in both directions of rotation. On the drive belt 17 engage on both sides of the shaft 23 wheels that are a monitoring device for switching off the Motor are assigned when the door leaf hits an obstacle. These designated facilities are not further described here

The drive belt 17, which is designed here as a toothed belt and in corresponding tooth formations of a on the output shaft 23 correspondingly held or formed belt drive wheel engages, on the other hand guided around the output gear 21, which can also have such a tooth formation. On one Part of the chassis, which is held stationary in the operating state

ίο 22 a brake pad holder 24 is provided in which Quiver-shaped holding opening, a pin-shaped brake pad 25 is inserted. The axis of the brake pad 25 or the quiver-shaped recess of the holder 24 intersects the axis 27 of the output gear 21, see above that the pin-shaped brake pad in the position shown radially on an inner surface 28 of an outer Wheel rim 29 of the output gear 21 is aligned.

In the position shown, the pin-shaped brake pad made of polyurethane is proportionate compressed far in the direction of the bracket This is the position in > If the brake pad exerts the maximum braking torque, the wheel, on the other hand, works in one or the other direction twisted, so the brake pad turns slightly to the side with respect to its longitudinal axis and only has a very slight braking effect on the inner surface of the wheel rim in the constant direction of rotation 29 of the output gear 21 a. The braking losses that occur are very low. Will be the end position of the door leaf in this previous direction of rotation of the driven wheel and the drive motor switched off, the door leaf tries due to a correspondingly elastic stop in the respective reached final position and due to the elasticity in the power transmission path for the drive between the drive motor and the door leaf. to turn the output gear in the opposite direction of rotation, because the door leaf wants to retreat from the end position reached. This endeavors are set accordingly curved obliquely from its longitudinal axis on df inner surface 28 of rim 29 of the output gear 21 adjoining, pin-shaped brake pad 25, because it is carried along by the inner surface 28 in its highly compressed position is influenced. As a result, this backward movement is prevented and with it that Door leaf held in the corresponding end position.

If, on the other hand, the motor is acted upon in the other direction of rotation, the door leaf is removed from the one To transfer the final position of movement to the other, the pin-shaped brake pad is over the illustrated, the Braking torque maxi: num reproducing position out into the other, dotted graphic abkrürr-, i> e position out of its longitudinal axis also transferred, since the drive motor readily accordingly is strong. If the door leaf then reaches the other End position, a jerk movement is now in the same way with regard to the other direction of rotation intercepted as this has already been described * above.

F i g. 4 shows, in the context of a detail view, another design of a brake pad 26, namely in the direction of its longitudinal axis, the holder is designed to be slotted. That way you have one simple possibility in hand to influence the braking force or the braking torque ivlaxirrtiim. Shown is the slotted, pin-shaped brake pad 26 again in its highest load position, so if that Braking torque maximum has just been passed through. in the

33 Ol 446

Otherwise, the brake pad 26 as well as the 25 according to FIG. 3 lies in one or the other depending on the direction of rotation other pivoting direction from its longitudinal axis.

For this purpose 3 sheets of drawings

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Claims (6)

33 Ol 446 claims: 1. Gate drive with a drive motor unit for gates or the like, in particular overhead gates, which is geared via a belt drive or the like, in particular a toothed belt drive, to a towing device, in particular in the form of an endless chain, for the door leaf, the belt on the drive side via a Belt drive wheel arranged or formed on the output shaft of the drive motor and guided on the output side via an output wheel, the latter being in gear connection with a drive wheel for the towing device, characterized in that on a gear part (21) between the drive motor shaft (23) and the door leaf (14 ) a stationary held Brenis device (24 _; 25) engages, the braking force of which passes through a degree when the direction of rotation is reversed with elastic deformation of the brake pad (25). 2. Door drive according to claim 1, characterized in that the braking device (24, 25) engages the output gear (21) 3. Door drive according to claim 1 or 2, characterized in that the braking device (24, 25) has a Holder (24) and a brake block stored in this (25) in the form of a pin made of plastic, in particular polyurethane. 4. Door drive according to claim 2 or 3, characterized gekennzeichpe 'that the brake pad (25) of the Axis (27) of the output gear (21) seen in the radial direction on an inner surface (28) of a Wheel rim (29) of the Abt / iebsrades (21) is aligned. 5. Door drive according to claim 3 or 4, characterized in that the holder (24) is the pin-shaped The brake block (25) encloses it in a quiver-shaped manner. 6. Door drive according to one of claims 1 to 5. characterized in that the brake pad (25) has at least one approximately perpendicular to the brake contact surface (28) extending incision (30) is provided.