DE3828484C2 - Fire protection roller door operator - Google Patents

Description

The invention relates to a fire protection roller door drive according to the Oberbe handle of claim 1.

Fire protection roller shutters are mainly used in buildings with public traffic such as hypermarkets Like. Used as protection against fire and in the alarm case, which is triggered by appropriate sensors, for example actively closed to prevent the spread of fire and correspond to provide adequate protection.

Drives for fire protection roller doors are known, in which after Closing the roller door of the operator only via a manual operation can be made ready by the anchor plate of the intended Haftmag is brought back to the latter. Since the drive is dec is attached on the opposite side, the adhesive plate is difficult to reach, so that putting the roller shutter back into operation is relatively lengthy and laborious is.

In addition, these known drives are difficult to adjust and therefore also so far not very user-friendly.

The object of the invention is a fire protection roller door drive according to the Generic preamble of claim 1, which is more user-friendly and ins especially after the alarm is easier to make ready for operation.

This object is in accordance with the characterizing part of claim 1 solved.

This ensures that after the automatic, purely mechanical Close the roller door of the anchor plate of the holding magnet by pressing one concealed switch and the resulting movement of the roller shutter in its defined lower end position again in contact with the holding magnet  brought to have the roller door ready for operation again and thus open to be able to. Since automatic closing also occurs if the battery power fails of the roller shutter, it is also convenient here if the roller shutter simply goes through switching on the power again and driving to the lower defined end position can be operated again.

Further embodiments of the invention are described below exercise and the subclaims.

The invention is illustrated below with reference to the accompanying figures illustrated embodiment explained in more detail.

Fig. 1 shows partially in section a fire protection roller door drive in side view.

FIG. 2 shows a detail of a front view of the drive from FIG. 1.

The fire protection roller door drive shown comprises an electric motor 1 which is provided with a spring-loaded, electrically ventilable brake 2 . The brake 2 has a pivotable release lever 3 which can assume three positions, one in which the brake 2 is released (left position in FIG. 1), one in which the brake 2 is manually released (right in FIG. 1), and a third neutral position with respect to the brake 2 . Via a hitch be 4 , which is also designed as a centrifugal brake, the motor 1 is coupled to a gear 5 . In addition, there is a working current brake 6 , which is fed by battery power. The motor 1 , on the other hand, is supplied by mains current.

The gear 5 is a three-stage spur gear or planetary gear, the output shaft 7 serves on the one hand for actuating a roller door, for example via an external chain drive, and on the other hand carries a chain wheel of an internal chain drive 8 , which leads from the gear 5 into an automatic control unit 9 , the housing 10 of which is screwed to the housing of the transmission 5 .

The control unit 9 contains a threaded spindle 11 rotatably mounted therein, which carries at one end a sprocket 12 arranged in a separate chamber of the housing 10 of the inner chain drive 8 . A switch nut 13 is adjustable on the threaded spindle 11 and has switch cams 16 for actuating two limit switches 14 and 15 . The limit switches 14 , 15 limit the lower and upper position of the roller door. In addition, two further limit switches can be provided for safety's sake, which take over the function of the limit switches 14 , 15 if they should be run over. The control unit 9 also contains two contactors for clockwise and anti-clockwise rotation, as well as a motor protection switch that can be manually switched at all poles, and a shunt release.

Furthermore, a pull rod 17 is provided, which is articulated on the one hand on the release lever 3 and, on the other hand, is guided into the housing 10 of the automatic control unit 9 and passed there through the switching nut 13 and is provided at the end with an adjustable nut 18 as a stop. On the outside of the Ge housing 10 is a 24 V battery powered magnet 19 is arranged, which has an end face, movable in the direction of the tie rod 17 and against pivoting Ver secured anchor plate 20 through which the tie rod 17 is passed with play. The pull rod 17 provided with the corresponding thread has two stops formed by nuts 21 , 22 , with a spring 23 located between the lever 21 on the release lever side and the anchor plate 20 , which presses the anchor plate 20 against the further housing-side nut 22 , where between the latter and a further spring 24 is arranged in the housing 10 . When current-applied holding magnet 19 presses its armature plate 20 via the housing-side nut 22 and against the force of the spring 24, the release lever 3 into a neutral position in which the brake disc of the brake 2 is held by spring force.

The roller shutter is normally operated via corresponding switches 25 for "open", "stop" and "closed". When the "Up" switch is actuated, a check is first made to determine whether sensors sensitive to fire or smoke are active. If this is not the case, the brake 2 and the motor 1 receive current, so that the roller gate is raised until the limit switch 15 provides for the interruption of the current. - When the "Closed" switch is actuated, the motor 1 is reversed, the roller shutter closes with motor power until the limit switch 15 switches off the current for the motor 1 and the brake 2 . - When the "Stop" switch is actuated, the current for motor 1 and brake 2 is interrupted, the latter engages.

When the sensors responding to fire or smoke are activated, ie in the event of an alarm, the current to the holding magnet 19 is interrupted. As a result, the pull rod 17 is adjusted to the left by the compression spring 24 , with reference to FIG. 1, as a result of which the release lever 3 releases the brake 2 . The roller door, which is exposed to a torque in the closing direction due to its own weight, external weights or spring preload, falls - braked by the centrifugal brake 4 - down. At the closing end, the pull rod 17 is pulled by the switch nut 13 , since the inner chains are driven by the falling of the roller door 8 and the switch nut 13 comes to rest against the nut 18 , so that the release lever 3 is moved into a position close to its neutral position . In this state, the brake 2 is in the "braked" state. The shaft of the roller shutter is prevented from running.

If the contact strips on the lower edge of the roller door are touched during the closing process, the working current brake 6 is excited by battery power, where it is stopped by the roller door. After releasing the contact strips, the roller door moves further down by itself. The contact strips remain ineffective in the lower end position of the roller door.

If the battery power fails, the holding magnet 19 is de-energized, the brake 2 is accordingly released via the compression spring 24 and the roller shutter closes as in the case of an alarm state caused by the activated sensors.

In order to make the roller door ready for operation again after an alarm or battery power failure, only the battery power for the holding magnet 19 needs to be switched on again via a hidden switch, the roller door simultaneously moving into the defined lower position. As a result, the switching cam 16 moves against the limit switch 15 for the lower position of the roller door and takes the train rod 17 with it, so that the neutral position of the release lever 3 is certainly reached. Then the armature plate 20 has been moved to the holding magnet 19 by the spring 23 . A manual operation of the release lever 3 can therefore be omitted.

A clamping device 26 , consisting of a ver connected to the housing 10 , adjustable by means of a knurled nut, is vorgese hen to clamp the anchor plate 20 of the holding magnet 19 in the position shown in Fig. 1, so that the roller shutter after switching off the network - And the battery power remains open, as it is expedient as construction progresses.

The limit switches 14 , 15 are located on spindles 27 which run parallel to the threaded spindle 11 and are received by corresponding threaded bores in the walls of the housing 10 , the spindles 27 protruding from the housing 10 at one end and by means of a tool, for example a screwdriver , are adjustable from the outside. Otherwise, the spindles 27 are secured against inadvertent rotation by means of appropriate torsion-proof nuts or spring washers.

The adjustment of the nut 18 for the pull rod 17 is carried out in such a way that the roller door is brought into the closed position, the holding magnet 19 is blocked by means of the clamping device 26 and then the mains voltage is switched off. Then the nut 18 is brought into contact with the switching nut 13 and secured.

The roller door can also be operated manually by means of a handwheel 28 .

Adjacent to the anchor plate 20 , a further microswitch 29, which can be actuated by the anchor plate 20 and which emits a signal to actuate a siren and / or a warning lamp which is fed by the battery voltage, can be attached to the housing 10 .

Claims (5)

1. Fire protection roller shutter drive with an electric motor ( 1 ) which is provided with a brake ( 2 ) which can be released via a release lever ( 3 ) which is biased in the release position by a spring ( 24 ) and which is coupled to a gearbox ( 5 ) via a clutch ( 4 ) with centrifugal brake with an auxiliary brake ( 6 ) supplied from a separate power source and with an automatic control unit ( 9 ) with a housing ( 10 ) which has a threaded spindle ( 11 ) which was driven via a chain ( 8 ) with the transmission ( 5 ) is coupled and a switching nut ( 13 ) for the upper and lower position of the rolling gate limiting limit switch ( 14 , 15 ) carries, on the outside of the housing ( 10 ) a holding magnet ( 19 ) with an armature plate ( 20 ), the current-carrying Holding magnet ( 19 ) the spring preload voltage of the release lever ( 3 ) is compensated, arranged, the power supply from the separate power source can be interrupted in the event of an alarm, characterized in that the release lever ( 3 ) is coupled to a pull rod ( 17 ) which passes through the anchor plate ( 20 ) into the housing ( 10 ) and through the switch nut ( 13 ) and with a stop ( 18 ) on the free one in the housing ( 10 ) End is provided, the spring ( 24 ) between an adjacent to the anchor plate ( 20 ) arranged stop ( 22 ) of the tie rod ( 17 ) against which the anchor plate ( 20 ) is spring-biased, and the housing ( 10 ) is clamped. 2. Fire protection roller door drive according to claim 1, characterized in that the pull rod ( 17 ) is provided with a thread and the stops ( 18 , 21 , 22 ) are nuts. 3. Fire protection roller door drive according to claim 1 or 2, characterized in that the Ge housing ( 10 ) has a separate chamber for receiving a with the threaded spindle ( 11 ) engaged chain wheel ( 12 ) of the chain drive ( 8 ). 4. Fire protection roller shutter drive according to one of claims 1 to 3, characterized in that the limit switches ( 14 , 15 ) on threaded spindles ( 27 ) which are received by threaded bores in the housing ( 10 ) and are accessible at one end from the outside, are arranged stably . 5. Fire protection roller door drive according to one of claims 1 to 4, characterized in that an actuatable via a knurled nut clamping device ( 26 ) for the anchor plate ( 20 ) is provided.