DE102005009995B4 - Locking / releasing device for a swing latch of a door opener - Google Patents

Abstract

Locking / release device (10) for a pivot latch of a door opener for use in fire protection doors with a pivotable locking lever (12) which locks or releases the pivot latch, with an electromagnet with an armature for unlocking the lock / release device (10), and with an emergency lock (20) which automatically locks the locking lever (12) in the event of a fire by means of a temperature-active means (24, 26, 28), characterized in that the emergency lock (20) comprises a bolt (22), the temperature-active means (24 , 26, 28) is designed to operate the bolt (22), and that the bolt (22) of the emergency lock (20) is designed to lock the locking lever (12) in such a way that the locking lever (12) is pivoted for Release of the swivel latch is blocked.

Description

The invention relates to a locking / releasing device for a pivoting latch of a door opener according to the preamble of patent claim 1.

There is a lock / release device for a swing latch of a door opener is known, which includes a locking lever which locks or releases the pivot latch, wherein the locking lever is pivotable by means of an electromagnet in a position releasing the pivot latch.

Electric door openers are well known and in use. One differentiates between working current and quiescent current version. Basically, the function of the electric door opener based on that a locking lever is held in the pivoting range of the pivot latch of the door opener, whereby the pivot latch is locked. Thus, a pivoting of the pivot latch is not possible and held in the pivot latch latch of the door remains locked. Here, the locking lever is often held by applying a spring force in this (rest) position. If a current is supplied to the electromagnet, then the locking lever can be pivoted, whereby a pivoting of the pivot latch is released. Here, the necessary mechanical force must overcome the applied spring force. The locking of the door is thus canceled and the door can be opened.

Fire doors should prevent the spread of fire in case of fire at least over a given period of time. In order to check their protection regulations, fire doors are subjected to a fire test with regard to their fire-prevention function or, in general, their fire-protection function. In this test, the effects of the effect of flame on the electric door opener are shown again and again. These are exposed to heavy loads (eg deformations) during the fire test and are often prone to unlock undesirably by disengaging the pivotal latch from engagement with the locking lever or the pivoting lever with the armature of the electromagnet and thus releasing the pivoting latch.

The otherwise reliable and safe working electric door openers can therefore not or only partially be used in fire doors. In order to keep the fire door closed, the door opener must have a stable trap, a high resistance and low trap clearance and the overlap between door latch and lock latch should be as large as possible. However, these demands are difficult to reconcile with increasing miniaturization of the door opener.

From the DE 103 21 802 A1 is a door opener assembly for fire doors with a locking lever and the locking lever locking hinged armature known, in which the locking lever and the hinged armature are each acted upon by a heat-expanding element in the direction of their mutual detent position. In case of fire, the elements expand, whereby even with a melting of the hinged armature and the locking lever acting springs locking of locking lever and hinged armature takes place. In this case, however, the elements must be designed so that they can exert relatively large forces on locking lever and hinged armature to ensure a reliable locking in case of fire for a sufficient period of time. This is not always the case in practice. Therefore, the heat-expanding elements, for a safe locking of the door opener in case of fire, must be made relatively large in order to apply sufficiently large forces on locking lever and hinged armature, which in turn is difficult to reconcile with the general miniaturization of door openers. This problem is exacerbated by the fact that at least two heat-expanding elements must be provided in the door opener.

It is an object of the invention to provide a generic locking / releasing device, which is compact and locks the fire doors effectively and safely in case of fire.

The solution of this problem arises from the features of claim 1, while advantageous embodiments and modifications of the invention are the dependent claims.

According to the invention, this object is achieved in that the lock / release device for a swing latch of a door opener further includes an emergency lock with a latch and a temperature-active means for latch actuation, wherein the emergency lock is designed to lock the locking lever. A lock in the immediate vicinity of the force introduction point between the pivot latch and locking lever prevents elasticity of a door opener and thus a door open.

The lock / release device is effectively locked by automatically extending the latch of the emergency lock by the temperature-active means. The temperature-active agent acts directly on the bar. The locking / releasing device also proves to be advantageous in that it manages with only a few elements and thus is inexpensive. Nevertheless, the lock / release device works very reliable because it works purely mechanically when exposed to heat, so in case of fire. Namely, the lock / release device can operate independently of fire detectors, their function in case of fire unreliable can be. For example, in a conventional lock / release device where the emergency lock is operated in response to fire detectors, malfunctions may occur because signal lines between the lock / release device and the fire detectors may be damaged (eg, by fire). Furthermore, only a temperature-active means is necessary, which acts centrally on the one latch of the emergency lock. It must therefore not be acted upon separately locking lever and armature separately. In addition, the force applied to the bolt by the temperature-active material may be much lower than when the locking lever or armature is directly loaded, whereby the temperature-active agent may be relatively small. Accordingly, the door opener can be made very compact with the present lock / release device.

The bolt locks in case of emergency locking a pivoting of the locking lever to release the pivot latch. Thus, an effective locking of the pivot latch is maintained by low design effort.

Preferably, the temperature-active agent expands when exposed to heat, whereby the latch moves into a correspondingly provided receptacle for locking the locking lever.

The temperature-dependent activation of the bolt can be done for example via a powder-coated bolt, which is self-holding pressed into a bore and when exceeding a trip temperature (for example in the case of a fire) by means of the temperature-active agent moves to the outside. The bolt moves wegbegrenzt against a lid and hinders the lateral movement (pivoting) of the locking lever, whereby a rigid force absorption of the door opener trap is given.

In an advantageous embodiment, the temperature-active agent expands at a heat exposure of preferably 100 ° C to 250 ° C. Thus, it can be ensured that the locking / release device is really effectively and reliably locked only in case of fire. The temperature-active material should have a large displacement or volume change in temperature.

Malfunctions, which can occur, for example, in connection with additionally provided fire detectors are thus bypassed. It is also particularly advantageous that an unnecessary locking of the locking / release device, and thus the fire door, due to a false alarm can be excluded. In many cases, smoke detectors issue a fire alarm, even though there is no fire. The reason for this is in many cases due to the fact that the smoke detectors detect smoke and / or steam, which, however, was created without fire or by a controlled (small) fire. However, in many facilities, especially commercial kitchens, smoke or steam often occurs without fire. In case of a false alarm then fire doors are closed and locked in a conventional manner unnecessary and partially unlocked only after the lapse of a long period of time. Such unnecessary locking is annoying, time-consuming and therefore expensive, especially in the working environment.

Preferably, the temperature-active agent is an intumescent material. This material is known in the art. In case of fire, intumescent materials inflate to about 5 to 10 times the original volume and form on their surface a stable and hard crust. They are commercially available in the form of rods, strips, pasty sprays, paints, adhesives, etc. The previous use of intumescent materials essentially comprises their use as cold or hot gas seals, d. H. in case of fire, the spread of hot flue gases in the sealed components, such as plastic pipes, cable ducts and ventilation shafts, should be prevented.

In a further embodiment, the temperature-active agent is a bimetallic spring. Such a spring consists of two firmly interconnected parts of metals or metal alloys with different coefficients of expansion. When the temperature changes, the two parts change their extent differently. This difference creates a change in shape and / or length.

In another embodiment, the temperature-active agent is a shape-memory spring. Such a spring expands upon heat treatment. If you use a two-way shape memory spring, it will return to its original shape at normal temperature.

In a further embodiment, the temperature-active agent provides a pyrotechnic effect.

In a further embodiment, the temperature-active agent contains a plastic material. This material should contain a large change in distance or volume when exposed to heat.

Preferably, the emergency interlock further includes a heating element responsive to a signal from at least one tripping device emits a heating energy, the temperature-active medium expanding in response to this heating energy. Thus, the temperature-active means can be heated remotely, if an alarm of a fire alarm device or a << NOT CLOSE >> in case of danger.

The invention will be further explained by means of embodiments which are illustrated in the drawing. This shows schematically:

1a a locking / release device in the normal case in a cross-sectional view in the longitudinal direction along a section line AA according to 2a . 2 B in an embodiment of the invention;

1b the lock / release device of 1a when exposed to heat;

2a a lock / release device in a view from above in an embodiment of the invention, wherein the lock / release device is in the locked state;

2 B the lock / release device of 2a in the unlocked state;

3 the lock / release device in a three-dimensional representation in an embodiment of the invention;

4a an emergency lock in the normal case in a longitudinal cross-sectional view, wherein the temperature-active agent is an intumescent material, in an embodiment of the invention;

4b the emergency lock of 4a when exposed to heat;

5a an emergency lock in the normal case in a longitudinal cross-sectional view, wherein the temperature-active means is a bimetallic spring, in an embodiment of the invention;

5b the emergency lock of 5a when exposed to heat;

6a an emergency lock normally in a cross-sectional view in the longitudinal direction, wherein the temperature-active means is a shape-memory spring, in an embodiment of the invention; and

6b the emergency lock of 6a when exposed to heat.

1a and 1b each show a locking / unlocking device 10 an electric door opener in the normal case and at a heat. The term "normal case" here means a state within a normal temperature range. The term "exposure to heat" in this case means the presence of a fire in the immediate vicinity of the locking / unlocking device. In this case, temperatures of above 100 ° C are present. The locking / unlocking device 10 contains a swiveling locking lever 12 which locks or releases a pivotal latch (not shown). The locking lever 12 , which can also be referred to as a change, is designed as an angle and contains an anchor arm 14 and a blocking arm 16 (for a better illustration see 2a and 2 B ). To unlock the locking / unlocking device 10 Normally, an armature of an electromagnet, not shown, acts on the armature arm 14 , When the armature locks the anchor arm, the lock arm locks 16 the pivotal trap. The anchor gives the anchor arm 16 free, the pivotal latch can the blocking arm 16 Press and release from its locked position.

In the housing of the lock / release device 10 is in the area below the barrier arm 16 provided a blind hole, within an emergency lock 20 is used. The emergency lock 20 includes a latch 22 and a temperature-active agent 24 . 26 . 28 , In this embodiment, the latch is as a bolt 22 formed in the hole 21 is mounted longitudinally displaceable. The emergency lock 20 is disposed within the bore such that the bolt 22 at the in the 1a Normal case shown no contact with the blocking arm 16 has, so the locking lever 12 is freely swiveling.

1b shows the lock / release device 10 when exposed to heat. When exposed to heat, the temperature-active agent expands 24 . 26 . 28 inside the hole, causing the bolt 22 is pushed out a bit. The upper end of the bolt moves 22 into a receptacle which at the lower end of the barrier arm 16 is trained. This locks the bolt 22 the barrier arm 16 and thus the entire locking lever 12 , More precisely, the inserted bolt locks 22 the pivoting range of the locking lever 12 , where the bolt 22 in the space between barrier arm 16 and housing enters. If the bolt from the blocking arm 16 is supported, it rests against the housing. Thus, the pivot latch remains reliably locked, whereby the door remains tightly closed.

In a further embodiment, the emergency lock 20 be arranged so that the extended bolt 22 in any spaces between locking lever 12 and housing can retract to a pivoting of the locking lever 12 to prevent. In yet another embodiment, the emergency lock 20 such within the lock / unlock device 10 be arranged that the extended bolt 22 directly prevents a release of the pivoting latch. For this example, the lock / release device 10 be arranged in the area of the pivot latch, so that the extended bolt 22 directly pivoting the pivot latch locks.

2a and 2 B each show the lock / release device 10 of the 1a and 1b in a view from above. 2a shows the lock / release device 10 in a state in which the locking lever 12 the pivot latch (not shown for purposes of illustration) locks. More specifically, the barrier arm locks 16 of the locking lever 12 the pivotal trap. This state is generally called the rest position, with a spring, not shown, exerting a force on the locking lever. 2 B whereas the lock / release device shows 10 in a state in which the locking lever 12 (blocking arm 16 ) releases the pivot latch. To allow this condition to be taken, an armature of an electromagnet (not shown) releases the armature arm 14 the locking lever 12 free, causing the locking lever 12 can be pivoted into a release position of the pivot latch.

3 shows the lock / release device 10 in a three-dimensional representation in an embodiment of the invention. In this form of representation is the lock / release device 10 shown in a state in which the locking arm 16 of the locking lever 12 the pivot latch (not shown) locks and locks.

4a and 4b each show an emergency lock 20 a lock / release device (not shown) in the normal case and at a heat. The emergency lock 20 contains a bar 22 , which is mounted longitudinally displaceably in a bore of the locking / release device. In this and the following embodiments, the latch is as a bolt 22 educated. Between the bolt 22 and the end of the bore is a temperature-active agent 24 inserted. In normal condition (see 4a ) is the temperature-active agent 24 in the compressed state. In this state, the front end of the bolt closes 22 flush with the open end of the bore and does not provide any locking function.

4b shows the emergency lock 20 when exposed to heat. When exposed to heat, the temperature-active agent expands 24 inside the hole, causing the bolt 22 is pushed out of the hole a bit. The front end of the bolt moves 22 in a recording, not shown, of the locking lever 12 (not shown) and locks it.

The temperature-active agent in this embodiment is an intumescent material 24 used, which expands when exposed to heat. Preferably, an intumescent material should be used which expands at a temperature greater than 100 ° C.

5a and 5b show an emergency lock 20 in the normal case and when exposed to heat. This emergency lock 20 is constructed as explained above. In this embodiment, the emergency lock contains 20 a temperature-active agent, which is a bimetallic spring 26 is that between the end of the hole and the bolt 22 is inserted.

Normally (see 5a ) is the bimetallic spring 26 compressed and the front end of the bolt 14 terminates flush with the open end of the bore.

When exposed to heat (see 5b ) is the bimetallic spring 26 in the expanded state, causing the bolt 22 a bit far out of the hole.

6a and 6b show an emergency lock 20 in the normal case and when exposed to heat. This emergency lock 20 is constructed as in the cases explained above. In this embodiment, the emergency lock contains 20 a temperature-active agent, which is a shape memory spring 28 is that between the end of the hole and the bolt 22 is inserted.

Normally (see 6a ) is the shape memory spring 28 compressed and the front end of the bolt 22 terminates flush with the open end of the bore.

When exposed to heat (see 6b ) is the shape memory spring 28 in the expanded state, causing the bolt 22 a bit far out of the hole.

Claims (9)

Locking / releasing device ( 10 ) for a swing latch of a door opener for use in fire doors with a pivotable locking lever ( 12 ), which locks or releases the pivotal latch, with an electromagnet with an armature for unlocking the lock / release device ( 10 ), and with an emergency interlock ( 20 ), which in case of fire, by means of a temperature-active agent ( 24 . 26 . 28 ) the locking lever ( 12 ) automatically locks, characterized in that the emergency lock ( 20 ) a bolt ( 22 ), wherein the temperature-active agent ( 24 . 26 . 28 ) for actuating the bolt ( 22 ), and that the bolt ( 22 ) of the emergency interlock ( 20 ) for locking the locking lever ( 12 ) is formed in such a way that thereby pivoting of the locking lever ( 12 ) is locked to release the pivot latch. Locking / releasing device ( 10 ) according to claim 1, characterized in that the temperature-active agent ( 24 . 26 . 28 ) expands when exposed to heat while the bolt ( 22 ) in a correspondingly provided receptacle for locking the locking lever ( 12 ) emotional. Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the temperature-active agent ( 24 . 26 . 28 ) is expanded at a heat of preferably 100 ° C to 250 ° C. Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the temperature-active agent is an intumescent material ( 24 ). Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the temperature-active means a bimetallic spring ( 26 ). Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the temperature-active agent is a shape memory spring ( 28 ). Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the temperature-active agent provides a pyrotechnic effect. Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the temperature-active agent contains a plastic material. Locking / releasing device ( 10 ) according to one of the preceding claims, characterized in that the emergency locking ( 20 ) further includes a heating element which in response to a signal from at least one triggering device emits a heating energy, wherein the temperature-active means ( 24 . 26 . 28 ) expands in response to this heating energy.

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