EP3071767B1 - Edge bolt and door sealing system - Google Patents

Description

TECHNICAL AREA

The present invention relates to an automatically actuated flush bolt and a door sealing system with such a flush bolt.

STATE OF THE ART

Out EP 1 308 590 a combination of a square bolt with an automatically lowerable door seal is known. For this purpose, the door seal has a through opening through which a locking bolt of the flush bolt passes. The door seal is activated via a release button protruding from the side of the door when the door is closed and opened. The flush bolt is lowered and raised independently of this by means of a manually operated lever.

Furthermore, automatically lowerable flush bolts are known from the prior art. So revealed U.S. 4,445,717 a flush bolt with an automatic release when the door is closed. For this purpose there is a nose which protrudes from the side face of the door leaf and which is connected to the locking bolt via a toggle lever. The bolt is lowered against a spring force. When the door is opened, the bolt is raised again due to the spring return force. This device also has a safety mechanism in the event of misalignment of the locking bolt. If the bolt comes to lie next to the locking recess when the door is closed, the multi-part bolt is pushed together against a second spring force.

In U.S. 6,409,231 there is also a safeguard for misalignment, whereby the bolt is raised in the event of a misalignment, whereby a compression spring arranged on the toggle lever is tensioned. A similar arrangement is also disclosed U.S. 4,005,886 .

U.S. 5,004,277 discloses a slot along which a vertical connecting rod can move to compensate for misalignment.

DISCLOSURE OF THE INVENTION

It is an object of the invention to create an automatically actuatable flush bolt with a bridging of the actuation mechanism in the event of a misalignment, which can be manufactured relatively easily and inexpensively.

This object is achieved by a flush bolt with the features of claim 1 and a door sealing system with the features of claim 13.

The automatically actuated flush bolt according to the invention has a fastening rail for fastening the flush bolt in or on a door leaf, an operating mechanism and a locking bolt with a longitudinal center axis. The actuating mechanism comprises a release element for the automatic displacement of the locking bolt from an initial position into a locking position and a return spring for returning the locking bolt from the locking position to the initial position. The flush bolt also has an automatic bridging mechanism which automatically bridges the actuating mechanism in the event of a misalignment of the locking bolt in order to prevent the locking bolt from being completely lowered into the locking position. The actuating mechanism has a displacement element on which the locking bolt rests with a driver, whereby the locking bolt can be brought into the locking position by moving the displacement element and wherein the displacement element can be brought into the starting position by means of the return spring together with the driver and the locking bolt resting on it. The locking bolt is relative together with the driver displaceable to the displacement element in the direction of the longitudinal center axis, the bridging being effected by this displaceability.

The locking bolt is thus lowered when the sliding element moves downwards. In the case of an opposing force, e.g. if the locking bolt is incorrectly positioned, it remains in its position even if the sliding element moves further downwards. When the sliding element is raised, it takes the locking bolt back into the starting position if the locking bolt is in an intermediate position.

A misalignment of the locking bolt occurs, for example, if there is no locking recess or an incorrectly placed locking recess. A misalignment is also present, for example, if the locking trough is designed too shallow in comparison to the bolt length and the bolt can therefore not penetrate deep enough into the trough.

Preferably, the displacement element forms a support surface which is slidably penetrated by the locking bolt and on which the driver rests. The support surface preferably has a through opening through which the locking bolt can move. This arrangement is easy to assemble and differently shaped locking bolts can be used.

In a preferred embodiment, the return spring is a compression spring, the displacement element pressing on this return spring. This minimizes the number of parts required.

In a preferred embodiment, the displacement element is U-shaped and has an upper and a lower leg. The lower leg slides against a stop surface of the fastening rail and the upper leg is made longer than the lower leg and slidably penetrated by the locking bolt. This is a simple way of enabling the dual function of the displacement element, ie actuation of the locking bolt and tensioning of the return spring, with as little effort as possible.

The displacement element is preferably a pressure plate which acts on the compression spring. Thanks to this arrangement, the height of the square bolt can be minimized. In particular, the release element of the actuation mechanism can be the top element of the flush bolt, with the exception of the fastening rail. In addition, the assembly of the square bolt is simplified thanks to the pressure plate.

In a preferred embodiment, the actuating mechanism has a toggle lever with a first leg or arm and with a second leg or arm pivotably connected to the first arm, the first arm being provided with the release element which protrudes from the fastening rail, and the second arm is operatively connected to the sliding element. This enables optimal power transmission and minimizes the space required. The second arm can be fixedly or detachably connected to the displacement element. Preferably it just rests loosely.

The fastening rail preferably has a front plate for resting on an end face or a side surface of the door leaf. It can also be arranged recessed. The locking bolt is preferably arranged at a distance from this front panel in such a way that the toggle lever is located between the longitudinal center axis of the locking bolt and the front panel. The toggle lever is thus made so small that the locking bolt can move upwards past the toggle lever in the direction of its central longitudinal axis. This also minimizes the overall size of the square bolt.

The return spring is preferably arranged at a distance from the longitudinal center axis. The return spring is preferably arranged between the fastening rail and the locking bolt. Thanks to this arrangement, the locking bolt can be arranged offset to the fastening rail without significantly increasing the overall space required by the square bolt. The offset takes place in the direction perpendicular to the longitudinal center axis. A small design of the square bolt is particularly welcome in modern architecture, since the use of a small square bolt does not significantly affect the flexibility in the design of the door.

This arrangement of the locking bolt and the return spring simplifies interaction with a door seal, in particular one that can be lowered automatically Drop-down seal. The locking bolt can also be combined with other types of door seals, for example with manually operated drop-down seals or with sliding seals. Since the locking bolt, thanks to its lateral offset, penetrates the door seal at a distance from the end of the seal on the door face, this face area of the door leaf can also be adequately sealed when the door is closed. However, the flush bolt according to the invention can also be used without lowering seals.

In a preferred embodiment, the flush bolt also has a force transmission spring which acts with a first end on the locking bolt and with a second end acts on the displacement element. This force transmission spring serves to at least partially transmit the lowering force that acts on the displacement element when the release element is activated to the locking bolt. If the locking bolt hits an obstacle while lowering, the force transmission spring first pushes the bolt further down. A small obstacle or one that can be moved with little force can be overcome by the bolt. This is particularly advantageous when using the square bolt with a seal in order to overcome frictional forces between elements of the seal and the locking bolt during lowering. However, if the obstacle can only be overcome with increased force, the bridging intervenes and the locking bolt stops and is thus displaced relative to the sliding element, which is lowering further down. Such larger obstacles are, for example, the above-mentioned misalignments of the bolt.

The power transmission spring preferably surrounds the locking bolt, the power transmission spring resting against the sliding element with a first end on a side of the sliding element opposite the driver and resting with a second end on a supporting surface that surrounds the locking bolt and is firmly connected to it. The force transmission spring is preferably a compression spring. This simplifies the assembly of the door sealing system and minimizes the size of the system.

The restoring spring and the force transmission spring preferably each have a longitudinal axis which are spaced apart and parallel to one another.

In a preferred embodiment, the fastening rail has a first Guide element and the driver on a second guide element which is in engagement with the first guide element. When the actuating mechanism is bridged, the locking bolt can be displaced in a straight line along its longitudinal center axis by means of these two guide elements. This guide is advantageous in all embodiments of the flush bolt according to the invention. It is particularly useful when used with a door seal, since here too the flush bolt cannot move transversely to the longitudinal direction due to the parts of the seal to be passed through.

The spring force of the return spring can be selected independently of the spring force of the force transmission spring. In particular, relatively light springs can be used.

The door sealing system according to the invention has a door seal and a flush bolt, the door seal having a sealing housing and a sealing element, and the sealing housing and the sealing element having a feed-through opening for the locking bolt to pass through. The door seal preferably has a carrier rail with a sealing element arranged thereon, the carrier rail being able to be lowered and raised together with the sealing element automatically with respect to the seal housing. The sealing element is preferably lowered and raised independently of the actuation of the locking bolt.

Further embodiments are given in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Figur 1

eine perspektivische Darstellung eines Türdichtungssystems mit einem erfindungsgemässen Kantriegel in Kombination mit einer Absenkdichtung;

Figur 2

eine Vorderansicht des Türdichtungssystems gemäss Figur 1;

Figur 3

eine Seitenansicht des Türdichtungssystems gemäss Figur 1;

Figur 4

verschiedene Varianten eines Querschnitts eines Riegelbolzens gemäss Figur 1;

Figur 5

eine Ansicht des Türdichtungssystems gemäss Figur 1 von oben;

Figur 6

eine erste Variante des Türdichtungssystems in der Ansicht gemäss Figur 5;

Figur 7

eine zweite Variante des Türdichtungssystems in der Ansicht gemäss Figur 5;

Figur 8

eine zweite perspektivische Ansicht des Türdichtungssystems gemäss Figur 1;

Figur 9

einen Längsschnitt durch das Türdichtungssystem gemäss Figur 1 in einer unbetätigten und somit angehobenen Ausgangsposition des Riegelbolzens;

Figur 10

einen Längsschnitt durch das Türdichtungssystem gemäss Figur 1 in einer betätigten und somit abgesenkten Verriegelungsposition des Riegelbolzens und

Figur 11

einen Längsschnitt durch das Türdichtungssystem gemäss Figur 1 bei einer Fehlausrichtung mit überbrücktem Betätigungsmechanismus.

A preferred embodiment of the invention is described below with reference to the drawings, which are only used for explanation and are not to be interpreted restrictively. In the drawings show:

Figure 1

a perspective view of a door sealing system with a flush bolt according to the invention in combination with a lowering seal;

Figure 2

a front view of the door sealing system according to Figure 1 ;

Figure 3

a side view of the door sealing system according to Figure 1 ;

Figure 4

different variants of a cross section of a locking bolt according to Figure 1 ;

Figure 5

a view of the door sealing system according to Figure 1 from above;

Figure 6

a first variant of the door sealing system in the view according to Figure 5 ;

Figure 7

a second variant of the door sealing system in the view according to FIG Figure 5 ;

Figure 8

a second perspective view of the door sealing system according to Figure 1 ;

Figure 9

a longitudinal section through the door sealing system according to Figure 1 in an unactuated and thus raised starting position of the locking bolt;

Figure 10

a longitudinal section through the door sealing system according to Figure 1 in an actuated and thus lowered locking position of the locking bolt and

Figure 11

a longitudinal section through the door sealing system according to Figure 1 in case of misalignment with the actuation mechanism bridged.

DESCRIPTION OF PREFERRED EMBODIMENTS

The figures show a door sealing system according to the invention with a flush bolt according to the invention and with a door seal. Door sealing systems of this type are usually used in multi-leaf doors. The The flush bolt is preferably arranged in the passive leaf, ie in that door leaf of the two-leaf or multi-leaf door which usually remains closed or has to be fixed separately so that the multi-leaf door remains closed. The flush bolt is arranged on the lock side, i.e. facing the other wing, the active wing.

In the solution according to the invention, the flush bolt is raised when the active leaf is opened. This means that the passive leaf can also be moved. This door sealing system is suitable for all types of multi-leaf doors, especially also for fire and smoke protection doors.
In this example, the door seal is a mechanically automatically lowerable door seal. It is attached, for example screwed, to a lower end face or in a groove on the end face of a door leaf. Door seals of this type usually serve as protection against light transmission from one room to another, as sound insulation and as protection against drafts. Such door seals are for example EP 0 338 974 known. If the seal is used in Minergie houses®, it usually has an air duct for air passage from one building room to the neighboring room.

The door seal has, as in the Figures 1 and 2 can be seen, a seal housing 1 with a support rail 3 held therein. Housing 1 and rail 3 are preferably made from an aluminum profile. Both are preferably U-shaped, the housing 1 being open at the bottom and the support rail 3 preferably being open at the top. A one-piece or multi-piece sealing element 2, which is preferably made of an elastomeric material, for example silicone, is fastened to the support rail 3.

The carrier rail 3 can be raised and lowered together with the sealing element 2 relative to the sealing housing 1. For this purpose, there is a lowering mechanism that is not visible and can be automatically activated mechanically, as is also known from the prior art. For example reveal EP 0 509 961 , DE 19 516 530 , DE 35 26 720 such as DE 34 27 938 such lowering mechanisms. Activation is preferably carried out on one side. For this purpose, the seal preferably has a release element in the form of a spring-loaded actuating rod on one end face, which when Closing of the door leaf is pending on the side door frame and is thereby pushed in. The rod is connected to a force transmission rod which runs in the upper region of the housing 1. Furthermore, one or more leaf springs are held in the housing, which are fastened with their respective first end to the power transmission rod and with their respective second end to the housing 1. A central area of the leaf springs is attached to the carrier rail 3. If the actuating rod is pressed in, the leaf springs are compressed and the support rail 3 is lowered. The sealing element 2 lies sealingly on the floor and closes the gap between the underside of the door leaf and the floor. If the door is opened again, the leaf springs are relieved again and the support rail 3 is raised again together with the sealing element 2.

It is of course also possible that the flush bolt according to the invention is used with a door seal which has a different mechanically automatically activated lowering mechanism. Likewise, only one sliding seal can be arranged in the housing 1, which cannot be raised and lowered relative to the housing. Furthermore, it is possible that a magnetic seal is arranged in the housing 1 or that the seal is activated electrically.

The flush bolt according to the invention has a housing, here called fastening rail 4, for fastening on or in an end face of the door leaf, not shown here. It is preferably attached to a lateral face in the lower or upper end area of the door leaf. The fastening rail 4 is preferably a U-shaped profile rail which is designed to be open towards the door leaf. It is preferably made of steel. It can be attached to the door leaf by means of a screw 42, for example.

A fastening plate 41 is provided at a lower end of the fastening rail 4. It is preferably designed in one piece with the rest of the fastening rail 4. It rests on an upper surface of the seal housing 1. A through opening 411 in the form of an elongated hole is present in the fastening plate 41. In the assembled state of the flush bolt, this opening 411 lies above a through opening 10 in the housing rail 1 and is preferably made much larger than a lower end of a locking bolt 6. One upwards into the door leaf The protruding screw 45 penetrates the fastening plate 41. The sealing housing 1 can be fastened to the door leaf by means of this screw 45.

In the front, end-face area of the fastening rail 4, there is a U-shaped fastening bracket 44. This engages with one leg in the fastening rail 4 and with a second leg running parallel to the first leg in the housing rail 1. This bracket 44 thus connects the rail 4 and housing 1 to one another in their front area. The elongated hole 411 and the bracket 44 enable simple assembly of the flush bolt and seal.

The flush bolt according to the invention also has an actuating mechanism 5. This comprises a release element 50 which penetrates a through opening of a front plate 40 of the fastening rail 4 and which protrudes.

The trigger element 50 can be configured in different shapes, such as the examples in FIG Figures 5 to 7 demonstrate. According to the Figures 5 and 6 be designed asymmetrically and have a beveled or even curved sliding flank 501 in the direction of movement of the inactive leaf when this inactive leaf is closed. It can, however, according to Figure 7 also be designed symmetrically with two opposite inclined sliding flanks 501, which end in a common point. The flush bolt shown here is activated mechanically in that the release element 50 is pressed in when the inactive leaf or the pedestrian leaf is closed or by other external forces. If the flush bolt is operated electrically, for example by using a motor, the release element does not have to protrude. In this case, the release element can be a switch which can be activated manually and / or by means of a signal.

The trigger element 50 is, as in Figure 3 is clearly visible, part of a toggle lever 51. This is arranged behind the front plate 40 and comes to lie in a corresponding groove of the door leaf. The trigger element 50 forms the extension of a first leg 510 of the toggle lever 51. This first leg 510 can be pivoted about a pivot axis 512 that is firmly connected to the fastening rail 4. At the free end of the first leg 510 opposite the release element 50 is a second leg 511 pivotally connected to this. An end of the second leg 511 opposite this connection is operatively connected to a displacement element 52. In this example, the displacement element is a pressure plate 52. Said end of the second leg 511 preferably lies loosely on this pressure plate 52 and can roll on it. A corresponding roll axis is provided with the reference symbol 513. A stop pin 53 serves as the upper stop for the first leg 510, with the leg 510 resting on the stop pin 53 when the release element 50 protrudes from the fastening rail 4, ie in an initial position, and when the element 50 is completely pushed in, ie in a locking position.

The pressure plate 52 runs approximately perpendicular to the front plate 40 and is held within the fastening rail 4 so as to be movable relative to the latter. It is preferably U-shaped, with a first upper limb 520 being longer than a second lower limb 521. The lower limb 521 preferably rests with its free end in a sliding manner on a rear stop surface 43 of the fastening rail 4 and is thereby vertical Movement led
The lower leg 521 presses on a first end of a return spring 55, here a compression spring. This return spring 55 extends parallel to the front plate 40 of the fastening rail 4 and stands with its second end on the fastening plate 41.

The upper leg 520 has a through opening 522 (see Figure 9 ), which is penetrated by the locking bolt 6. The locking bolt 6 has a longitudinal center axis a, which extends parallel to the longitudinal axis of the return spring 55.

The locking bolt 6 has an upper area, the bolt neck 60, and an adjoining lower area, the bolt body 61. The bolt neck 60 preferably has a round cross-section and it is held so as to be displaceable relative to the pressure plate 52 within the through opening. The bolt neck 60 is firmly connected to a driver 8 which is arranged above the upper leg 520 of the pressure plate 52 and rests loosely thereon in an initial position. The driver 8 is preferably designed as a plate. The bolt neck 61 has an external thread 63, which an internal thread of the driver 8 meshes. As a result, the length of the section of the bolt 6 that projects downward from the pressure plate 52 can be adjusted. Thus, the flush bolt can be adapted to the lowering stroke of the door seal and the distance between the bottom B and the bottom of the door. This adjustability is in Figure 3 represented by the circular arrow.

The driver 8 has a protruding lug 80 which engages in a vertically running gap 46 formed in the stop surface 43 of the fastening rail 4 and is guided in this gap 46 and can be displaced. Gap 46 and nose 80 thus form a groove / sliding block connection and form an anti-twist device for the locking bolt 6. This is shown in FIG Figure 8 recognizable.

At the upper free end of the bolt neck 60, a ring 62 protruding radially outward is arranged. It serves as an upper stop when the height of the locking bolt 6 is adjusted by means of the thread 63.

In the lower area of the stud neck 60, i. Below the pressure plate 52 there is a first stop ring 70 for a force transmission spring 7. This force transmission spring 7 is also preferably a compression spring. It surrounds the bolt neck 60 and rests on the underside of the upper leg 520 of the pressure plate 52. A second stop ring 71 can be attached to the force transmission spring 7 for this purpose. The force transmission spring 7 is preferably pretensioned.

The cross section of the bolt body 61 can be round, rectangular, oval or square, as shown in FIG Figure 4 is shown. It can also have a different shape. It not only penetrates the through opening 411 of the fastening plate 41, but also through openings in the drop-down seal. For this purpose, the seal has a through opening 10, 20 each in the housing as well as in the sealing element 2 and optionally in the support rail 3, which are aligned with one another and with the elongated hole 411 of the fastening plate 41. It is also possible for a guide element to be arranged in the lowering seal in order to guide the locking bolt in its movement relative to the seal. This is already over EP 1 308 590 known.

In this example, the bolt body 61 is already in the raised state, i.e. in the starting position, the sealing element 2 below. This does not necessarily have to be the case; it can also end inside or even above the seal or it can be flush with the lower edge of the sealing element.

Based on Figures 9 to 11 the functioning of the flush bolt according to the invention and the door sealing system according to the invention is described below:
The reference symbol B denotes a building floor and L is a locking trough, ie a recess in this floor B, in which the locking bolt 6 is intended to engage when the door leaf is closed.

In Figure 9 shows the situation with the door open, ie the starting position. At least the pedestrian wing is open. The flush bolt shown and also the door seal of the standing sash are in the raised position. The actuating element 50 protrudes from the front plate 40. The actuating rod of the seal, not shown, also projects from the housing 1 in the longitudinal direction of the seal. This rod usually protrudes from the other end of the seal (not shown here).

The toggle lever 51 is in Figure 9 unloaded and the return spring 55 relaxed. The pressure plate 52 is thus in its upper position. The force transmission spring 7 is also unloaded and the locking bolt 7 penetrates the seal; however, its lower end is at a distance from the floor B and the locking recess L.

In the situation according to Figure 10 the active leaf, not shown, and the passive leaf are closed, ie the locking position is shown. The actuating rod of the lowering seal is pressed in by resting on the door frame and the sealing element 2 is lowered. It rests on the floor B with a seal. The trigger element 50 of the flush bolt is also on the door frame, not shown, and is thereby pressed in. The toggle lever 51 is activated and now presses the pressure plate 52 downwards. The return spring 55 is tensioned. The driver 8 and the locking bolt 6 lower together with the pressure plate 52. The driver 8 moves along in a guided manner the gap or the guide groove 46 and, together with the force transmission spring 7, serves as an anti-twist device for the locking bolt 6. The locking bolt 6 engages in the locking depression L without resting on the bottom of the depression. The passive leaf is now locked.

If the active leaf or the inactive leaf is opened again, the external force on the release element 50 does not apply. The restoring spring 55 relaxes again and presses the release element 50 outwards. The pressure plate 52 is raised and, thanks to the driver 8, also raises the locking bolt 6 back into its starting position. In addition, independently of this, the support rail 3 with the sealing element 2 is raised by relieving the actuation rod. That means the starting position according to Figure 9 is reached again.

If, however, there is no or too little recess in the floor B when the standing wing and the active wing are closed, the bridging or securing system is used. This situation is in Figure 11 shown. The bridging or securing is essentially formed by the displaceability of the locking bolt 6 relative to the pressure plate 52. If the release element 50 is pressed in by a stop, for example the pedestrian wing, when the standing wing is closed, the locking bolt 6 is first lowered together with the pressure plate 52. As soon as it is on the ground or another massive obstacle and the spring force of the force transmission spring 7 is too low, the locking bolt 6 remains in this position while the pressure plate 52 lowers further. The pressure plate 52 is thus distanced from the driver 8. The carrier rail 3 with the sealing element 2 can nevertheless be lowered, since the actuating rod and the corresponding lowering mechanism of the seal function independently of the flush bolt.

When the standing wing or the active wing is opened, the seal rises again. In addition, the restoring spring 55 of the flush bolt is also relaxed here, whereby the pressure plate 52 is raised. As soon as it has reached the driver 8, which has remained in an intermediate position, it takes it and thus also the locking bolt 6 upwards into the starting position. The trigger element 50 is pivoted out of the front plate 40 again.

The force transmission spring 7 is not absolutely necessary. However, if it is present as shown in this example, the force transmission spring 7 acts as a force-transmitting member on the locking bolt 6 when the pressure plate 52 is lowered. If the locking bolt 6 encounters an obstacle that can be overcome or if it has to overcome lateral friction forces when penetrating the seal, it will move down as long as these forces are less than the spring force of the force transmission spring 7. In the Figures 9 and 10 the force transmission spring 7 is thus relaxed or slightly pretensioned. In Figure 11 the bottom forms an insurmountable obstacle for the bolt 6. As a result, the force transmission spring 7 is now compressed by the further displacement of the pressure plate 52 and thus tensioned. If the door is opened again or the pressure plate 52 is raised, the force transmission spring 7 can also relax again or return to its starting position. This spring 7 also serves as an anti-twist device for the bolt 6.

The flush bolt according to the invention and the sealing system according to the invention can also be used on an upper end face of the door. In this case, the pretensioned force transmission spring 7 is mandatory and provides a counterforce to the weight of the locking bolt. The terms used in the description and in the claims, such as "raise", "lower" and the like, thus also relate to this type of use, with "raise" as drawing the sealing element into the housing rail and "lowering" as extending the sealing element from the housing rail is to be understood in a sealing position.

The flush bolt according to the invention is particularly suitable for use with door seals, preferably with drop seals. REFERENCE LIST 1 Seal housing 513 Roll axis 10 Through opening 52 printing plate 2 Sealing element 520 first leg 20th Through opening 521 second leg 3 Support rail 522 Through opening 4th Mounting rail 53 Stop pin 40 Front panel 55 Return spring 41 Mounting plate 6th Locking bolt 411 Long hole 60 Bolt neck 42 screw 61 Bolt body 43 Stop surface 62 ring 44 Mounting bracket 63 thread 45 Fastening screw 7th Power transmission spring 46 gap 70 first stop ring 5 Operating mechanism 71 second stop ring 50 Release element 8th Carrier 501 Sliding flank 80 nose 51 Knee lever 510 first leg B. ground 511 second leg L. Locking recess 512 Swivel axis a Longitudinal central axis

Claims (15)

1. An automatically actuable flush-bolt mechanism
   having a fastening rail (4) for fastening the flush-bolt mechanism in or on a door leaf,
   having an actuating mechanism (5), and
   having a locking bolt (6),
   wherein the actuating mechanism (5) comprises a triggering element (50) for automatically displacing the locking bolt (6) from a starting position into a locking position, and also comprises a restoring spring (55) for restoring the locking bolt (6) from the locking position into the starting position,
   wherein the flush-bolt mechanism has an automatic override function which, in the event of misalignment of the locking bolt (6), automatically overrides the actuating mechanism in order to prevent the locking bolt (6) from being lowered all the way into the locking position, wherein the locking bolt (6) has a longitudinal center axis (a),
   characterized
   in that the actuating mechanism has a displacement element (52), on which the locking bolt (6) rests by way of a driver (8), wherein the locking bolt (6) can be brought into the locking position by virtue of the displacement element (52) being moved, and wherein the displacement element (52) can be brought into the starting position, together with the driver (8) resting thereon and the locking bolt (6), by means of the restoring spring (55),
   in that the displacement element (52) can be displaced in the direction of the longitudinal center axis (a) relative to the locking bolt (6) and driver (8), and in that overriding takes place by virtue of this displacement capability.
2. The flush-bolt mechanism as claimed in claim 1, wherein the displacement element (52) forms a bearing surface, which has the locking bolt (6) passing through it in a displaceable manner and on which the driver (8) rests.
3. The flush-bolt mechanism as claimed in claim 2, wherein the locking bolt (6) passes through a through-opening (522) of the displacement element (52) in a displaceable manner.
4. The flush-bolt mechanism as claimed in one of claims 1 to 3, wherein the restoring spring (55) is a compression spring, and wherein the displacement element (52) presses onto the restoring spring (55).
5. The flush-bolt mechanism as claimed in one of claims 1 to 4, wherein the displacement element (52) is of u-shaped design and has an upper and a lower limb (520, 521), and wherein the lower limb (521) butts with sliding action against a stop surface (43) of the fastening rail (4), and wherein the upper limb (520) is designed to be longer than the lower limb (521) and has the locking bolt (6) passing through it in a displaceable manner.
6. The flush-bolt mechanism as claimed in one of claims 1 to 5, wherein the actuating mechanism (5) has a toggle lever (51) with a first arm and a second arm, which is connected in a pivotable manner to the first arm, wherein the first arm is provided with the triggering element (50), which projects in front of the fastening rail (4), and wherein the second arm is operatively connected to the displacement element (52).
7. The flush-bolt mechanism as claimed in claim 6, wherein the fastening rail (4) has a front plate (40) for bearing on or in a door leaf, and wherein the locking bolt (6) is spaced apart from said front plate (40) such that the toggle lever (51) is located between the longitudinal center axis (a) of the locking bolt (6) and the front plate (40).
8. The flush-bolt mechanism as claimed in one of claims 1 to 7, wherein the restoring spring (55) is spaced apart from the longitudinal center axis (a).
9. The flush-bolt mechanism as claimed in claim 8, wherein the fastening rail (4) has a front plate (40) for bearing on or in a door leaf, and wherein the restoring spring (55) is arranged between the front plate (40) and the locking bolt (6).
10. The flush-bolt mechanism as claimed in one of claims 1 to 9, wherein a force-transmitting spring (7) is present, said spring acting on the locking bolt (6) by way of a first end and acting on the displacement element (52) by way of a second end.
11. The flush-bolt mechanism as claimed in claim 10, wherein the force-transmitting spring (7) surrounds the locking bolt (6), wherein the force-transmitting spring (7) butts, by way of a first end, against the displacement element (52), on a side of the latter which is located opposite the driver (8), and rests, by way of a second end, on a bearing surface (71), which surrounds the locking bolt and is fixed thereto.
12. The flush-bolt mechanism as claimed in one of claims 1 to 11, wherein the fastening rail (4) has a first guide element (46), and wherein the driver (8) has a second guide element (80), which is in engagement with the first guide element (46), and wherein the locking bolt (6), in the case of the actuating mechanism being overridden, can be displaced rectilinearly along its longitudinal center axis (a) by means of said two guide elements (46, 80).
13. A door-sealing system having a door seal and a flush-bolt mechanism as claimed in one of claims 1 to 12, wherein the door seal has a seal housing (1) and a sealing element (2), and wherein the seal housing (1) and the sealing element (2) each have a through-passage opening (10, 20) through which the locking bolt (6) passes.
14. The door-sealing system as claimed in claim 13, wherein the door seal has a carrier rail (3), wherein the sealing element (2) is arranged on said carrier rail (3), and wherein the carrier rail (3), together with the sealing element (2), can be lowered and raised automatically in relation to the seal housing (1).
15. The door-sealing system as claimed in claim 14, wherein the operation of lowering and raising the sealing element (2) is independent of the actuation of the locking bolt (6).

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