EP0443050B1 - Assembly for the operation of a damper door - Google Patents

Abstract

An assembly serves for operation of a damper door, in particular an air hole damper door or dome, which can be pivoted about a fixed first rotation axis (2) from a closed position into an alarm position and back again, with at least one linear drive element. At its end a first traverse part (1) of the damper door is fitted pivotably at a point on the damper door remote from the rotation axis (2), whilst its second end is fitted pivotably about a first pivot axis (11) on a supporting lever (12), which in turn can pivot about a fixed second pivot axis (13) close to the rotation axis of the damper door. In order to achieve a large opening angle of the damper door with only the single linear drive element, a supplementary deflection lever (15) is fitted with a first end pivotably on the first pivot axis (11) of the door. The second end of the deflection lever engages pivotably on the traverse part (1) of the damper door at a distance from its rotation axis (2) and from the fixing point (7a) of the first end of the drive element. <IMAGE>

Description

The invention relates to a joint arrangement for actuating a flap, in particular a smoke flap or dome, which can be pivoted about a fixed, first axis of rotation from a closed position into an alarm position and back, with at least one linear drive element, one end of which at a point remote from the axis of rotation the flap is pivotally attached to a cross member of the flap and which, on the other hand, is pivotally attached to a support lever about a first pivot axis, which in turn is pivotable about a fixed, second pivot axis in the vicinity of the pivot axis of the flap.

In order to achieve the alarm position required in certain countries for SHEV systems with an opening angle of approximately 165 ° using known joint arrangements of this type, complex additional measures are required. For example, a known joint arrangement of the type mentioned at the outset has a second drive element designed as a cylinder, which on the one hand pivotably engages at one end of the support lever and on the other hand on a bracket which extends downward from the vicinity of the axis of rotation of a dome. With this second cylinder, the support lever can be pivoted upward, together with the first cylinder, which is also pivotably mounted approximately in the middle of the support lever and which, on the other hand, extends to an upper cross member of the skylight dome. - The expense for such an RWA device is high because of the second air cylinder.

At this point, it is pointed out that the designation joint arrangement chosen in the application is a synonym, in particular for an RWA device. The joint arrangement can also be used in other devices with a flap actuation.

In another, prior art joint arrangement of a fire protection device, in addition to a first cylinder, a gas spring is provided for actuating a skylight dome, which engages at the end of a support lever. In order to be able to open or close a dome light of such a known fire protection device beyond 120 °, a third actuating element - motor or cylinder - is required. - This results in an even higher effort. - In addition to the state of the art, it is noted that the light flap cannot be closed automatically with all heat protection devices in SHEV systems and corresponding joint arrangements, but instead manual closing and mechanical locking are required.

In the case of a smoke and heat extraction device which is similar to the joint arrangement of a fire protection device discussed above, a stand frame can be opened by approximately 170-180 ° with a pressure medium cylinder which is articulated on a bracket or support lever which is articulated on a curb. A piston rod of the pressure medium cylinder is pivotally connected to the mounting frame. An additional damping cylinder is connected on the one hand to the first common swivel axis between the pressure medium cylinder and the support lever and on the other hand to a fixed cross member of the curb. The support lever serves as a support during the opening stroke of the print media cylinder. After the opening stroke has been carried out by the pressure medium cylinder, the stand frame with skylight dome can roll over into its fully open end position, the complete opening being supported by the kinetic energy which is generated by the extension of the piston rod of the pressure medium cylinder. The rollover movement of the support frame, which begins after the piston rod has been fully extended, is damped with the damping cylinder (DE-A-3 143 318).

In another known closure arrangement, a compression spring in a tube always tries to press a closure flap into an open position via a piston rod and a first connecting lever and a second connecting lever (US-A-2 544 500). Therefore the opening movement is limited by a chain or a cable. In particular, one end of the tube, in which the compression spring is accommodated, is articulated on the flap, while the opposite end of the piston rod forms a common first pivot axis with the first connecting lever. The opposite end of the first connecting lever is pivotable about a fixed axis. Near the center of the first connecting lever, which can be regarded as a support lever, the second connecting lever is pivotably attached to this. The opposite end of the second connecting lever is in turn hinged to the flap.

In another known arrangement, only a single tension spring is used for positioning doors or the like, in particular for opening (FR-A-1 467 870). Its first end is connected to a fixed swivel axis near the axis of rotation of the door. The opposite end of the tension spring is pivotally attached to a rod about a pivot axis, which can be regarded as a support lever. One end of an additional lever, which can be regarded as a deflection lever, is arranged on the latter pivot axis. A second end of the additional lever or reversing lever is pivotally connected to the door at a distance from its axis of rotation. The fixed pivot axis, about which the tension spring can be pivoted, is higher and closer to the first axis of rotation, about which the door can be pivoted, than the pivot axis, about which the rod corresponding to the support lever can be pivoted.

Furthermore, in a known flap support bracket in which the flap is in the closed position in a vertical position, a gas spring is pivotally attached at one end to a toggle arm which can be regarded as a support lever (DE-A-2 633 787). The other end of the gas spring is pivotable about a pivot axis in the vicinity of the pivot axis of the flap. In the vicinity of the pivot axis for the gas spring on the toggle lever arm there is a further pivot axis for a second, smaller toggle lever arm, the second end of which is articulated on the flap away from its axis of rotation. The fixed pivot axis, about which one end of the gas spring can be pivoted on a bearing plate, is not further than the pivot axis, about which the toggle lever arm corresponding to the support lever can be pivoted, with respect to the first axis of rotation of the flap.

Finally, US-A-4,429,491 discloses a joint arrangement with the features of the preamble of claim 3 and FR-A-2,469,543 a joint arrangement similar to this. Both known objects have a drive element, a support lever and a bell crank. The subject of US-A-4,429,491, however, lacks a fixed third pivot axis with the features that can be gathered from the characterizing part of claim 3. The subject of FR-A-2.469.543 has a fixed pivot axis on which the drive element is arranged, but here the drive element does not engage with its other free end on the pivot axis common to the deflection lever and the support lever. In addition, the fixed pivot axis for the drive element is not located at a local distance from the axis of rotation of the dome, which is between the distance of the fulcrum for the bellcrank and the fulcrum for the support lever to the axis of rotation of the dome.

The object of the present invention is to create a joint arrangement of a device with a flap which can be operated completely independently in and from an alarm position and which can be opened and closed over a large swiveling range, which can be up to approximately 165 °, with only one drive element allowed.

This object is achieved according to the invention for a joint arrangement of the type mentioned in the preamble of claim 1 in a first variant in that the joint arrangement has only one linear drive element, on the first pivot axis of which an additional deflection lever is pivotably arranged with a first end, the second end End pivotally engages the cross member of the flap at a distance from its axis of rotation and to the attachment point of the first end of the drive element.

This makes it possible to pivot the bearing point or the suspension point of the drive element on the support lever with the same drive element that is on the flap or directly attacks the cross member connected to the flap.

A completely automatic opening or closing of the flap in the alarm position or out of it is thus achieved with only one additional passive element, namely the bell crank.

To adjust the opening and closing force and the swiveling speed in individual operating phases, the positions of the two swiveling axes, the axis of rotation and the fulcrum, which form a four-bar linkage, can be selected when designing the joint arrangement.

In particular, in the aforementioned first variant of the joint arrangement according to claim 7, the first pivot axis, on which the drive element is mounted, is located at one end of the support lever. The support lever does not need to protrude bulky beyond the pivot axis.

In a second variant, the stated object is achieved for a hinge arrangement of the type mentioned in the preamble of claim 2 in that the hinge arrangement has only one linear drive element which is long in construction, the first pivot axis of which lies approximately in the middle of the longitudinal extent of the support lever that an additional bellcrank is pivotally arranged with a first end at an end of the support lever remote from the second pivot axis, and that a second end of the bellcrank is pivotable on the cross member of the flap at a distance from its axis of rotation and to the attachment point of the first end of the drive element attacks.

The second variant is therefore based on the same principle as the first variant, according to which only a single linear drive element for opening and closing the smoke flap or Dome around a large swivel range is sufficient by making use of an additional deflection lever as a passive element which is articulated at a location of this support lever which is remote from the second swivel axis about which the support lever can be pivoted. The bell crank also has the effect here that a longitudinal expansion of the drive element has an effect in lifting and opening the smoke flap and, conversely, shortening the drive element in retracting or closing the smoke flap.

The second variant, in which the cylinder pivot point is moved approximately to the center of the support lever, is particularly advantageous if a cylinder with a longer stroke is selected, since the cylinder can be extended downward beyond its first pivot axis on the support lever. In the closed state of the smoke flap, the cylinder is arranged obliquely so that it does not protrude far down. In addition, there is no risk that the lower end of the drive element abuts a cross member on which the flap is pivotally mounted when opening or closing.

A third variant is based on a joint arrangement for actuating a flap, in particular a smoke flap or dome, which can be pivoted about a fixed, first axis of rotation from a closed position to an alarm position and back, with at least one linear drive element, one end of which is around a first Pivot axis is pivotally attached to a support lever which in turn is pivotable about a fixed, second pivot axis in the vicinity of the axis of rotation of the flap.

For this third variant of the joint arrangement, the stated object is achieved in that the joint arrangement has only one linear drive element, on the first pivot axis of which there is an additional deflection lever with a first one End is pivotally arranged, the second end pivotally engages the cross member of the flap at a distance from the first axis of rotation, and that the drive element with its second end is pivotable about a fixed, third pivot axis which is in fixed connection with a fixed, second cross member , to the first axis of rotation, about which the flap can be pivoted, is arranged deeper and horizontally further, ie at a greater horizontal distance than the second pivot axis, about which the support lever can be pivoted.

Again, the task is solved according to the same principle as in the first two variants, namely with a single linear drive element to achieve a large swivel range and with an additional deflection lever, one end of which is pivotally connected to the support lever and the other end of which Truss part of the smoke flap is articulated. Compared to the first variant, the third variant differs essentially only in a different arrangement and mounting of the linear drive element. The third variant advantageously achieves a large ratio of the torques exerted on the smoke flap when opening to the torques when closing. This advantageously takes into account the greater load when opening, in particular due to snow or ice. - However, the third variant of the joint arrangement takes up more installation space than the first variant, which is therefore cheaper in this regard.

In all variants of the joint arrangement, the second pivot axis, about which the support lever can be pivoted, is preferably attached to a support bracket approximately below the axis of rotation of the flap or its cross member.

In SHEV systems with a flap that can be pivoted about an axis of rotation from the closed position into a normal ventilation position and also into the alarm position and back, a double-stroke cylinder is advantageously used as a linear drive element.

In the case in which a lifting cylinder, in particular a double lifting cylinder, is used as the drive element, the first and the second pivot axis can simultaneously serve to supply the compressed air to the lifting cylinder, according to claim 7, the first pivot axis and the second pivot axis each serving as rotary unions for the supply of the pressure medium to which the lifting cylinder is designed. Between the pressure feedthroughs on the first pivot axis and those on the second pivot axis there is a line of the pressure medium which pivots together with the support lever.

Appropriately, a locking device can be arranged near the first end of the linear drive element on the cross member such that the locking device can be actuated by the drive element. Thus, the drive element has an additional function, namely the automatic actuation of the locking device, which is necessarily synchronized with the opening and closing movement.

Further features and advantages of the variants of the joint arrangement according to the invention result from the following description in conjunction with the drawing.

Fig. 1

ein bevorzugtes Ausführungsbeispiel der ersten Variante der Gelenkanordnung mit einem Doppelhubzylinder in drei verschiedenen Stellungen, wobei die geschlossene Grundstellung mit durchgezogenen Linien dargestellt ist und eine Normal-Lüftungsstellung sowie eine Alarmstellung jeweils mit unterbrochenen Linien, in einer Seitenansicht;

Fig. 2

eine Einzelheit der Gelenkanordnung nach Fig. 1, nämlich ein Traversenoberteil in einer Seitenansicht;

Fig. 3

einen Schnitt durch das Traversenoberteil in der Schnittebene A-A in Fig. 2;

Fig. 4

eine weitere Einzelheit der Gelenkanordnung nach Fig. 1, nämlich ein Traversenunterteil in einer Seitenansicht;

Fig. 5

eine Draufsicht auf das Traversenunterteil nach Fig. 4;

Fig. 6

eine weitere Einzelheit der Gelenkanordnung nach Fig. 1, nämlich einen Stützhebel in einem Schnitt durch eine Mittelebene;

Fig. 7

den Stützhebel nach Fig. 6 in einer Draufsicht, worin die Mittelebene mit B-B bezeichnet ist;

Fig. 8

eine weitere Einzelheit der Gelenkanordnung nach Fig. 1, nämlich einen Umlenkhebel in einem Schnitt durch eine Mittelebene;

Fig. 9

eine Ansicht auf eine Stirnseite des Umlenkhebels nach Fig. 8;

Fig. 10

eine Draufsicht auf den Umlenkhebel nach Fig. 1, in welcher die mittlere Schnittebene mit C-C bezeichnet ist;

Fig. 11

ein bevorzugtes Ausführungsbeispiel der zweiten Variante der Gelenkanordnung mit einem Hubzylinder in zwei verschiedenen Stellungen, wobei die geschlossene Grundstellung mit durchgezogenen Linien dargestellt ist und die am weitesten geöffnete Alarmstellung mit unterbrochenen Linien, in einer Seitenansicht und

Fig. 12

ein bevorzugtes Ausführungsbeispiel der dritten Variante der Gelenkanordnung mit einem Hubzylinder, ebenfalls in der geschlossenen Grundstellung mit durchgezogenen Linien sowie in der Alarmstellung mit unterbrochenen Linien.

The three variants are explained below using a drawing with twelve figures. Show it:

Fig. 1

a preferred embodiment of the first variant of the joint arrangement with a double-stroke cylinder in three different positions, the closed basic position is shown with solid lines and a normal ventilation position and an alarm position with broken lines, in a side view;

Fig. 2

a detail of the joint arrangement of Figure 1, namely a cross member top in a side view.

Fig. 3

a section through the upper cross member in the section plane AA in Fig. 2;

Fig. 4

a further detail of the joint arrangement of Figure 1, namely a cross member bottom in a side view;

Fig. 5

a plan view of the truss lower part of FIG. 4;

Fig. 6

a further detail of the joint arrangement of Figure 1, namely a support lever in a section through a central plane.

Fig. 7

the support lever of Figure 6 in a plan view, wherein the central plane is designated BB.

Fig. 8

a further detail of the joint arrangement of Figure 1, namely a bell crank in a section through a central plane.

Fig. 9

a view of an end face of the bell crank according to FIG. 8;

Fig. 10

a plan view of the bell crank according to Figure 1, in which the central section plane is designated CC.

Fig. 11

a preferred embodiment of the second variant of the hinge arrangement with a lifting cylinder in two different positions, the closed basic position is shown with solid lines and the most open alarm position with broken lines, in a side view and

Fig. 12

a preferred embodiment of the third variant of the joint arrangement with a lifting cylinder, also in the closed basic position with solid lines and in the alarm position with broken lines.

In Fig. 1, the elements of the first variant of the joint arrangement are denoted in the closed representation with simple numbers, the same elements in a normal ventilation position with the same numbers, but with a dash and the same elements in the alarm position with the same numbers, but with two dashes.

The hinge arrangement serves to actuate a smoke flap, which is not itself shown, but which is firmly connected to a cross member 1, which extends in the middle of the smoke flap between two opposite sides of this smoke flap. The upper cross member and with it the smoke flap can be rotated about an axis of rotation 2. The turning range is with a dash-dotted circle segment 3 indicated. It extends over about 165 °.

In the closed position shown, the upper cross member lies on a lower cross member 4, from the left side of which a support bracket 5 extends vertically downward. The support bracket is stiffened with a support 6, which is guided obliquely upwards to the cross member 4.

On the right-hand side, opposite to the axis of rotation 2, a piston rod 8 is articulated to the upper cross member 1 and belongs to a double-stroke cylinder 9 - a compressed air cylinder. The double-stroke cylinder 9 represents a linear, straight-line drive element of the joint arrangement, namely its only one. A lower end 10 of the double-stroke cylinder 9 lies in an imaginary first pivot axis 11, which is designed as a rotary feedthrough for supplying the compressed air to the double-stroke cylinder. The pivot axis or the rotary leadthrough is arranged at one end of a support lever 12, the opposite end of which is mounted on the second end of the support bracket 5 on a second pivot axis 13, which is also realized by a rotary leadthrough.

A deflection lever 15 also extends between the first pivot axis 11 and a pivot point 14 in the cross member 1. The deflection lever 15 thus represents a passive connecting element between the first pivot axis 11 and the cross member 1 in addition to the active connecting element, namely the double-stroke cylinder 9, whereby there are different points of attack on the top of the truss. The pivot point 14 is closer to the axis of rotation 2 than the center of the upper cross member.

The axis of rotation 2, the first and the second pivot axis 11, 13 and the pivot point 14 form a four-bar linkage. The mutual Distances of the axis of rotation, the two pivot axes and the pivot point can be selected in certain ranges in order to specify the angular velocities of the pivoting movement of the upper cross member 1 and the forces occurring during this movement, which are exerted in particular by the double-stroke cylinder 8 on the upper cross member.

In the area of the piston rod 8 there is a locking device 16 on the right side of the upper cross member in FIG. 1 in the vicinity of the piston rod in such a way that the locking device can be unlocked by an initial movement of the piston rod.

Accordingly, when the double-stroke cylinder 9 is pressurized with compressed air so that the piston rod 8 is pushed out of it, the locking device that allows the upper cross member 1 and the smoke extraction flap connected to it to pivot is released first. The double lifting cylinder 9 is supported on the support lever 12 on the pivot bearing 11, which, however, cannot deflect downwards in a clockwise direction because of the bell crank 15. Rather, the elements connected to the first pivot axis 11 at the bottom are pivoted counterclockwise, which has an effect on the right side 7 of the cross member 4 in FIG. 1 in a pivoting movement in the direction of an arrow 17. In other words, the force deflection by means of the deflection lever 15 generates a thrust force in the support lever, which is supported on the support bracket in the region of the second pivot axis 13. With the described opening movement by lifting the first pivot axis 11 and the elements connected to it, the normal ventilation position is reached, in which the upper cross member is denoted by 1 '. (As mentioned, the reference symbols of the other elements in the normal ventilation position are also marked with a line.)
With a further stroke, which is carried out by the double-stroke cylinder with increased pressurization, the fully open alarm position is finally reached at approximately 165 °, in which the upper part of the cross member is denoted by 1˝. The piston rod 8˝ is now fully extended from the double stroke cylinder 9˝. The position of the support lever 12˝ and the bell crank 15˝ is shown in FIG. 1. It can be seen how the alarm position can only be achieved with these elements, ie only with one drive element.

To close or partially close the smoke vent flap by pivoting the upper part of the crossbar in the opposite direction, the processes described proceed in the opposite direction when the double-stroke cylinder is pressurized with compressed air. No further drive element is required for the closing movement either; the closing movement takes place by means of the double-stroke cylinder 9 as the only drive element in a convenient manner without manual operation. During the closing movement, the piston rod 8˝ is retracted, the bell crank 15˝ rotating about the pivot point 14˝ and thus dragging the support lever 12˝ back in a circular path about the second pivot axis 13. The support lever 12˝ forms a translation of the drive movement by the double-stroke cylinder. As a result, the upper cross member can be moved back into the closed position, in which the locking device 16 engages automatically. The locking force depends, as mentioned, on the mutual distances between the axis of rotation 2, the first and second pivot axes 11, 13 and the pivot point 14 and can thus be influenced in terms of design.

From Fig. 1 is still an attachment 18 can be seen, which serves to integrate the four-bar mechanism with the smoke flap in a building, but does not contribute to the essential function of the four-bar system.

For individual components of the joint arrangement described, reference is made below to FIGS. 2-10:
FIGS. 2 and 3 show the upper cross member, which essentially consists of strip-shaped end plates 19, 20 on both sides and an inverted U-shaped support 21 connecting them. The cross member is shown reversed in Fig. 2 compared to the representation in Fig. 1, so that an attachment point 7a of the first end of the double-stroke cylinder on its piston rod in Fig. 2 is on the left side of the cross member. This attachment point 7a forms a pivot bearing. An attachment point for a second end 15b of the deflection lever - see FIGS. 8 and 10 - is therefore located beyond the center of the upper cross member on its right side. The corresponding fulcrum bearing point in the upper cross member for the bell crank is designated 14.

FIGS. 4 and 5 show a corresponding lower cross member 4 on which the described upper cross member comes to rest when the flap is closed. The lower part of the truss essentially consists of two end angle pieces 22 and 23, which are connected to one another by struts 24 and 25 running parallel to one another. The struts also consist of angle profiles. The support bracket 5 projects downward from the end angle piece 22. It is connected to the struts 24 and 25 at its lower end via a support 6, which is designed as a double support. At the lower point of the support bracket is the second pivot axis 13, which is provided for the support lever 12 - see FIG. 1.

In Figures 6 and 7 is the mutually parallel angle profiles 26 and 27, which are mutually by angle pieces 28 and 29 are connected, existing support lever shown. At one end 12a there are bores which form parts of the first pivot axis. Rotary unions for the double-stroke cylinder, not shown, can be mounted in the bores. At the opposite end 12b of the support lever, the second pivot axis 13 is also provided with rotary unions. The longitudinal section in FIG. 6 runs in the section plane BB, which is indicated in FIG. 7.

Finally, FIGS. 8-10 show different views of the deflection lever, of which FIG. 8 in turn shows a longitudinal section along a central plane, here C-C in FIG. 10. The longer section of the bell crank consists of two angle profiles 30 and 31, which are connected to one another by angle pieces 32 and 33 at a parallel distance. The angle piece 32 is oriented so that it forms a closed front. On this a box-shaped end piece 34 is welded, which is so narrow that it fits between the legs of the U-beam 21 of the upper cross member and is easily pivotable between them. The corresponding pivot point 14 - see Fig. 1 - is located at the end 15b of the bell crank. The opposite first end 15a is pivotable about the first pivot axis 11 - see FIG. 1 - and has holes for the pivotable mounting.

The interaction of the components described has been explained in connection with FIG. 1.

Variants, for example in the form of a hydraulic cylinder or an electric motor with a spindle, are possible for the linear, straight-line drive element, which is designed as a pneumatic double-stroke cylinder according to FIG. 1.

As mentioned, the relative positions of the pivot axes, the axis of rotation and the pivot point, which are the four-bar linkage form, selectable so that in particular the opening and closing forces can be influenced.

In a departure from the illustration in FIG. 1, the lower end of the double-stroke cylinder 9 can also be articulated at intermediate points of the support lever 12 between its ends 12a and 12b. It is also possible to pivotally mount the cylinder on an extension of the support lever which extends beyond the end 12a. Corresponding variations of the upper attachment point 7a of the double lifting cylinder on the upper cross member are possible.

The locking device 9a can be designed as a pneumatic or hydraulic or mechanical lock with a separate drive element; However, the actuation discussed by the double-stroke cylinder is expedient.

In the second variant of the joint arrangement according to fig. 11 and in the third variant of the joint arrangement according to FIG. 12, the same parts as in the first variant are provided with the same reference numerals. The elements in the fully open alarm position are again distinguished from the same elements in the rest position in that the reference numerals of these elements are provided with two lines in the alarm position.

The second variant according to FIG. 11 differs from the first variant of the joint arrangement according to FIG. 1 essentially in that in the second variant a first pivot axis 35 of a lifting cylinder 36 serving as the drive element is laid approximately in the middle of the longitudinal extent of a support lever 37. The lifting cylinder 36 is not supported with its lowermost end on the first pivot axis 35, but further up towards its center. As a result, the lifting cylinder 36 is not in the closed position here illustrated flap to save space at an angle. When the flap is opened, when a piston rod 38 moves out of the lifting cylinder into the position 38˝ and thus moves the upper cross member into the fully open alarm position 1˝, the lower section of the lifting cylinder 36 cannot hit the lower cross member 4. The mode of operation of the support lever 37 and a deflection lever 39 is basically the same here as described in connection with the first variant of FIG. 1 above, so that repetition can be dispensed with here. The position of the second pivot axis 13 on the support lever 37 and the pivot point 14 of the deflection lever 39 on the cross member 1 is also the same as in the first variant in Fig. 1, so that for the second pivot axis 13 and the pivot point 14 of the second variant the same reference numerals are used. Likewise, in the second variant, the location of the piston rod 38 on the cross member 1 is designated 7a. The lower end of the deflection lever 39, which in the second variant is not mounted on the support lever 37 at the same point as the lifting cylinder 36, has a third pivot axis 40 on this support lever, specifically at the end of the support lever remote from the second pivot axis 13 37.

The particular advantage of the second variant according to FIG. 11 is due to the recognizable space-saving position of the lifting cylinder, which can be pivoted freely out of the lower part of the truss, that the length of the lifting cylinder and its stroke are largely freely selectable, so that even cylinders with a relatively long length Hub can be used.

The third variant of the joint arrangement according to FIG. 12 differs from the first variant according to FIG. 1 essentially in that in the third variant a lifting cylinder 41 with a lower end 42 is not pivotably mounted on a pivotable support lever, but on one with the Truss lower part 4 firmly connected drive carrier 33 or in another suitable manner, but in any case firmly on the truss lower part. The corresponding third pivot axis, which is used for mounting the lifting cylinder 41 on the drive carrier, is designated here by 44. It is also noteworthy about the third variant that a piston rod 45 of the lifting cylinder 41 is not connected to the upper cross member 1 as in the first variant of the joint arrangement, but with a first pivot axis 46 at an end of a support lever 47 remote from the second pivot axis 13 The arrangement of the second pivot axis of the support lever 47 is here again the same as in the first variant on the lower support bracket 5, so that here the second pivot axis is also provided with the reference number 13. In other words, the piston rod 45 of the lifting cylinder 41 is not directly connected to the upper cross member 1 in the third variant of the articulated arrangement, but is only connected to it via a deflection lever 48, which is further supported here at the center at a pivot point 49 on the upper cross member is.

A major advantage of the third variant is that when the flap, which is also not shown here, is opened from the position of the elements of the joint arrangement shown in solid lines in FIG. 12 into a wide-open alarm position, which is shown with broken lines, torques on the upper part of the truss 1 are exercised, which are relatively large compared to the torques when closing from the alarm position.

It follows from the above descriptions of the three variants that the upper cross member, the lower cross member, the support lever and the bell crank can be of the same or at least quite similar design in all three variants. The support lever of the second variant has one between pivot axis 35 located at its two ends, in contrast to the pivot axis of the first and third variants. The attachment point of the piston rod is missing on the upper cross member of the third variant; on the other hand, a drive carrier for mounting the lifting cylinder is fixedly attached to the lower cross member, in contrast to the first and second variant.

Claims (8)

1. Assembly for the operation of a damper door, especially a fume extraction damper door or cupola which can be swivelled about a stationary, first pivot (2) from a closed position into an alarm position and back with at least one linear drive element (9), the one end (8) of which, at a position of the damper door removed from the pivot (2), is attached to a first traverse part (1) of the damper door and which at the other end is attached to a supporting lever (12) so that it can be swivelled about a first pivot (11) whereby the supporting lever for its part can be swivelled about a stationary, second pivot (13) in the vicinity of the pivot of the damper door, characterized in that the assembly is only provided with the one linear drive element (9), at the first pivot (11) of which the first end (15a) of an additional guide lever (15) is disposed so that it can be swivelled, the second end of which (15b) engages so that it can be swivelled at the traverse part (1) of the damper door at a distance from its pivot (2) and from the attachment position (7a) of the first end of the drive element.
2. Assembly for the operation of a damper door, especially a fume extraction damper door or cupola which can be swivelled about a stationary, first pivot (2) from a closed position into an alarm position and back with at least one linear drive element (36), the one end (38) of which, at a position (7a) of the damper door removed from the pivot (2), is attached to a first transverse part (1) of the damper door and which at the other end is attached to a supporting lever (37) so that it can be swivelled about a first pivot (35) whereby the supporting lever for its part can be swivelled about a stationary, second pivot (13) in the vicinity of the pivot of the damper door, characterized in that the assembly is only provided with the one linear drive element (36), of which the first pivot (35) is located approximately in the middle of the longitudinal extension of the supporting lever (37), in that a first end of an additional guide lever (39) is disposed so that it can be swivelled at an end (40) of the supporting lever (37) which is at a distance from the second pivot (13) and in that a second end (14) of the guide lever (39) engages so that it can be swivelled at the transverse part (1) of the damper door at a distance from its pivot (2) and from the attachment position (7a) of the first end of the drive element.
3. Assembly for the operation of a damper door, especially a fume extraction damper door or cupola, which can be swivelled about a stationary, first pivot (2) from a closed position into an alarm position and back with a single linear drive element (41), the one end of which is attached to a supporting lever (47) so that it can be swivelled about a first pivot (46), whereby the supporting lever for its part can be swivelled about a stationary, second pivot (13) in the vicinity of the pivot (2) of the damper door and an additional guide lever (48), the first end of which is disposed so that it can be swivelled at the first pivot (46) and the second end of which engages so that it can be swivelled at the transverse part (1) of the damper door at a distance from its first pivot (2), characterized in that the second end (42) of the drive element (41) can be swivelled about a stationary, third pivot (44) which is disposed in a fixed connection to a stationary, second transverse part (lower transverse part 4) in a lower position and in a further removed position than the second pivot (13) from the first pivot (2), about which the damper door can be swivelled, whereby the supporting lever (47) can be swivelled about the second pivot (13) in such a way that the distance of the third pivot (44) from the first pivot (2) is greater than the distance of the point of rotation (49) of the guide lever (48) at the transverse part (1) from the first pivot (2) and is greater than the distance of the second pivot (13) from the first pivot (2).
4. Assembly for the operation of a damper door, which can be swivelled about a pivot (2) from the closed position into a normal ventilation position and in addition into the alarm position and back according to one of the preceding claims, characterized in that a double-stroke cylinder (9) is provided as a linear drive element.
5. Assembly according to one of claims 1 to 4, characterized in that the second pivot (13), about which the supporting lever (12, 37, 47) can be swivelled, is attached to a supporting bracket (5) approximately below the pivot (2) of the damper door.
6. Assembly according to claim 1, 3 or 4, characterized in that the first pivot (11, 46) is located at one end (12a) of the supporting lever.
7. Assembly with a lifting cylinder as linear drive element according to claim 1 or 2, characterized in that the first pivot (11, 35) and the second pivot (13) are in each case constructed as a rotary leadthrough for supplying a pressure medium to the lifting cylinder.
8. Assembly with a mechanical locking device of the damper door according to claim 1 or 2, characterized in that the locking device is disposed near the first end (attachment position 7a) of the linear drive element at the first traverse part (1) in such a way that the locking device (16) can be operated by the drive element.

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