EP4148210A1 - Door lock and latch for a door lock - Google Patents

Abstract

The invention relates to a latch (10) for a door lock (4). The latch (10) has a pivotable front section (13) and at least one magnet (15) which holds the front section (13) in a basic pivoted position. The invention also relates to a door lock (4) with such a latch (10).

Description

The invention relates to a latch for a door lock, which has a pivotable front section. The invention also relates to a door lock with such a latch.

A door lock generally has a bolt which, when the door lock is in a locked position, moves into an opening in a striking plate. The door lock with the retractable bolt is usually attached to the door and the locking plate is attached to a door frame. The reverse arrangement is also conceivable.

A latch in a door lock is a bolt that automatically moves into the opening of the strike plate when the door is closed. This can be achieved, for example, in that the latch is pressed out of the door lock under the action of spring force and has a starting bevel in its front section, through which the latch is first pressed in when the door is closed. As an alternative, magnetic latches are known, which are moved into the locking plate by magnetic forces after the door has been closed.

The latch in the lock is often coupled to a follower and above it to a handle so that it can be pulled back to open the door.

In certain situations, it may be desirable to be able to open the door by pressing or pulling it accordingly without depressing the handle, even if the latch has been retracted into the locking plate. In hospitals or other public buildings, for example, this can serve as a protective measure against contamination from germs that could be on the handles.

From the pamphlet DE 20 2021 101 478 U1 a case of the type mentioned is known, in which the front section is designed to be pivotable. The publication describes a latch with a starting bevel, through which the latch is pushed in when the door is closed, so that the door can also be closed without actuating the latch. This section of the latch, which has the starting bevel, is pivotable and spring-loaded on a base body of the latch so that when pressure is applied to the closed door in the opening direction, this pivotable section swings open and the door is released. In this way, opening the door by counter-pressing with z. B. the shoulder or the foot is possible without having to touch the latch. A spring is provided to hold the pivotable section in the position that this section would have in a latch that has a fixed front section.

The disadvantage of the arrangement described is that a spring with a relatively high spring force and preload must be used in order to release the door only when there is sufficient pressure to open it. Otherwise, differences in air pressure or the like would be enough to open the door. By using a spring with high spring force and corresponding preload, the trigger point can be chosen appropriately, but a relatively high force is then required to continue the pivoting process until the latch moves out of the strike plate and the door can be opened . In addition, such a spring with a corresponding spring constant requires a relatively large amount of space compared to the size of the latch and is therefore not easy to integrate into a latch.

It is an object of the present invention to create a latch of the type mentioned at the outset, which is triggered by a certain pressure or tensile force against the door and can be moved out of the locking plate with as little force as possible after it has been triggered. Another object is to describe a door lock with such a latch.

This object is achieved by a latch or a door lock with the respective features of the independent claims. Advantageous configurations and developments are the subject matter of the dependent claims.

A latch according to the invention of the type mentioned at the outset with a pivotable front section is characterized by at least one magnet that holds the front section in a basic pivoted position. Due to the pivotability, the front section of the latch can fold over if there is sufficient pressure or train on a door in which a door lock with this latch is used. This removes the latch's engagement with a strike plate, allowing the door to be opened without having to use a door handle that would otherwise pull the latch back to open the door.

In contrast to the spring-loaded holding of the front section in a basic pivoting position, which is known from the prior art, this results by using the magnets, an advantageous force-angle functional relationship between a necessary force for pivoting open the front section as a function of a pivoting angle of the front section. When using a spring, the force required to fold down the front section increases with the swing angle. By using the magnets according to the invention, on the other hand, a large holding force is achieved for the front section in the basic pivoted position. As soon as this has been overcome and the front section begins to swing open, the force required for further swinging open reduces rapidly as the swing angle increases, due to the great dependence of the magnetic forces on the distance. For the opening process of the door, this means that after overcoming a holding force with which the door is held closed, the door can then be opened easily.

In an advantageous embodiment of the latch, the front section is connected to a base body via a hinge, with a pivot axis of the hinge preferably being aligned vertically in the installation position of the latch and being arranged on the side of the latch that leads when the door lock is closed. When the front section is folded down, it then levers the base body into a housing in the door lock, counter to the disengagement direction of the latch, as a result of which the door can be opened without the latch running the risk of jamming in the striking plate.

In a further advantageous embodiment of the latch, a base plate is arranged on the base body, to which the hinge is attached. The at least one magnet is then preferably arranged in the front section of the latch and/or in the base plate. A magnet located in the base plate or the front section is basically sufficient if a ferromagnetic counter-element is arranged in the respective other element or the element itself is made of a ferromagnetic material. Alternatively, it is also possible to provide at least one magnet in both the base plate and in the front section, which attract each other.

In a further advantageous embodiment, the latch has a damper which dampens the front section moving back into the basic pivoting position. The damper can be a linear damper, for example, which is inserted with a cylinder into a recess in the base body and acts on the front section with a piston rod. By the damper is a possibly disturbing noise when the front section is folded back is prevented.

The damper can be inserted into the recess together with a spring arrangement in such a way that the damper is pressed towards the base plate by the spring arrangement. This spring arrangement prestresses the damper in the direction of the base plate, so that when the front section is folded back, the spring arrangement is first compressed before the damper becomes active when the front section is folded back further. In this way, the impact of the front section on the piston rod can also be reduced in noise. In addition, a cap made of a softer material can be placed on the piston rod, which already brings about a noise reduction.

In a further advantageous embodiment, the latch has a locking option, by means of which the front section can be firmly coupled to the base body in the basic pivoted position. As a result, the additional function of contactless opening of the door lock can be prevented if necessary by the latch according to the invention. A pin, bolt or screw can be provided to block the pivoting of the front section with respect to the base body. In a further development it can be provided that the pivotability of the front section in relation to the base body is blocked in a controlled manner via an electrical, magnetic and/or electromagnetic component. Advantageously, the additional function according to the invention of contactless opening can then be provided or prevented automatically, e.g. time-controlled, for example adapted to operating or office opening times.

A door lock according to the invention is characterized in that it has such a latch. The advantages explained above in connection with the case arise for the door lock. The door lock is preferably designed as a mortise lock and can accordingly be used universally.

Fig.1a

eine Schnittdarstellung einer Tür mit einem Türschloss und einer anmeldungsgemäßen Falle;

Fig. 1b

eine Detailansicht der Figur 1a;

Fig. 2, 3

verschiedene Schnittdarstellungen einer Falle des Türschlosses gemäß den Figuren 1a, b;

Fig. 4

eine räumliche Explosionsdarstellung der Falle der Figuren 2 und 3.

The invention is explained in more detail below using an exemplary embodiment with the aid of figures. The figures show:

Fig.1a

a sectional view of a door with a door lock and a case according to the application;

Fig. 1b

a detailed view of Figure 1a ;

Figures 2, 3

different sectional views of a case of the door lock according to the Figures 1a , b;

4

a spatial exploded view of the trap Figures 2 and 3 .

In the Figures 1a and 1b First, a door 1 with a door lock 4 according to the application is shown in a horizontal cross section. The Figure 1a shows a section through the entire door including part of a frame 5. Figure 1b shows a section figure 1 in the area of the door lock 4.

The door 1 is pivoted about a hinge 2 on a wall or a frame, not shown here. On the face side, a milling 3 is made in the door 1, in which the door lock 4 is mounted in the manner of a mortise lock.

The door lock 4 has a latch 10 that can be retracted and extended and that moves into an opening in the locking plate 7 when the door 1 is in the closed state. In the example shown, the locking plate 7 is mounted on the frame 5 in the area of a recess 6 .

The latch 10 has a slide 11 with which it is mounted in the door lock 4 so that it can be displaced longitudinally. A base plate 12 is arranged on a front end of the slide 11 pointing in the direction of the locking plate 7, on which a front section 13 of the latch 10 is pivotably mounted via a hinge. From the hinge is in the Figures 1a, 1b a pivot axis 14 can be seen. The pivot axis 14 is aligned vertically when the latch 10 is in the installed position and is located on the side of the latch 10 that leads ahead when the door 1 is closed. The front section 13 of the latch 10 shown has a starting bevel, through which the latch 10 can be released by simply pressing the door 10 shut is first pressed against a spring force in the door lock 4, in order to then move into the opening of the locking plate 7 under the action of a spring force.

The Figures 1a and 1b show a state of the door 1 in which, starting from the closed state, a force is exerted on the door in the opening direction, such as is symbolized by an arrow in the figures. Due to the pivotability of the front section 13 of the latch 10, when there is sufficient pressure or train on the door 1, the front section 13 pivots about the pivot axis 14 relative to the base plate 12 and thereby levers the slide 11 of the latch 10 into the housing of the door lock 4. whereby the door 1 can be opened without the case 10 being able to be opened by means of a door handle, not shown here.

In order to prevent undesired opening, for example due to a draft, the front section 13 may only fold open relative to the base body 12 when a certain force acts on the front section 13 in the transverse direction. For this purpose, according to the application, the front section 13 is held in the non-folded basic pivoting position by at least one magnet 15 which is embedded in the front section 13 and/or the base plate 12 .

In the Figures 2-4 an exemplary embodiment of a trap 10 according to the application is shown in various illustrations in more detail. figure 2 shows a sectional view through the latch 10 in a horizontal sectional plane (with the usual installation position of the latch in a vertically aligned door), figure 3 shows a vertical section through the case 10 and figure 4 a spatial exploded view of the case 10. The in the Figures 2 and 3 illustrated, not unfolded pivot position of the front section 13 is referred to in this application as the basic pivot position.

In particular figure 4 an end face 111 of the slide 11 can be seen, onto which the base plate 12 is mounted, in particular screwed. The base plate 12 has hinge eyes 121 through which the pivot axis 14 is inserted. The front portion 13 has similar lugs through which the pivot axis 14 also passes to form the hinge. The slider 11, the base plate 12 and the front section 13 are advantageously made of plastic.

Next are in figure 4 Recesses 122 can be seen in the base plate 12, in which two cuboid magnets 15 are used here. The depressions 122 can be formed with undercuts, so that the magnets 15 can be pressed and clipped into the depressions 122 and held by the undercuts. Alternatively or additionally, gluing in the magnets 15 is possible.

Similar indentations may also be formed in the front portion 13 to accommodate two more of the magnets 15. The direction of magnetization of the magnets 15 is chosen so that the magnets 15 in the base plate 12 and in the front section 13 attract each other and the front section 13 is thus held by the magnets in the non-folded basic pivoted position. In alternative configurations, round magnets can also be used instead of the cuboid magnets 15 . Furthermore, the number of four magnets 15 is purely exemplary. Ultimately, a magnet 15, which is arranged in the base plate 12 or the front section 13, is sufficient if a ferromagnetic counter-element is arranged in the respective other element or the element itself is made of a ferromagnetic material.

An advantage of using the magnets 15 compared to holding the front section 13 in the basic pivoting position under the action of a spring force lies in a suitable functional relationship of a necessary force for pivoting open the front section 13 as a function of a pivoting angle. When using a spring, the force required to fold down the front section 13 increases with the pivoting angle. By using the magnets 15 according to the application, on the other hand, a large holding force is achieved for the front section 13 in the basic pivoting position. As soon as this has been overcome and the front section 13 begins to swing open, the force required for further swinging open reduces rapidly as the swing angle increases, due to the great dependence of the magnetic forces on the distance. For the opening process of the door 1, this means that after overcoming a holding force with which the door 1 is held closed, the door 1 then opens slightly and a sluggish opening process is prevented.

After the door 1 is opened, the magnetic forces are sufficiently large, even when the front section 13 is folded over, to bring the front section 13 back into the basic position.

In order to prevent any disturbing noise when the front section 13 is folded back, a damper 16 is provided in the exemplary embodiment shown here. The damper 16 is designed as a linear damper and has a cylinder 161 from which a piston rod 162 extends under the action of spring force. With pressure on the piston rod 162 in the direction of the cylinder 161, the piston rod 162 moves damped back into the cylinder 161. The cylinder 161 of the damper 16 is arranged in a corresponding recess 112 in the slide 11 .

The free end of the piston rod 162 protrudes through a bore 123 in the base plate 12 and, in the basic pivoting position of the front section 13, rests against its base. When the front section 13 folds over, the piston rod 162 of the damper can extend through the bore 123 and protrudes correspondingly over the surface of the base plate 12. When the front section 13 is folded back, it first hits the piston rod 162 and is then cushioned and guided into the basic pivoted position. In order to avoid noise as far as possible when the front section 13 hits the piston rod 162, a cap 163, for example made of a softer plastic or a hard rubber material, is additionally placed on the end of the piston rod 162 in the exemplary embodiment shown.

In the exemplary embodiment shown, a spring arrangement 17 is additionally present in the insertion direction of the damper 16 into the receptacle 112 . This spring arrangement 17 biases the damper 16 in the direction of the base plate 12 . It has a relatively small spring constant, so that when the front section 13 is folded back, the spring arrangement 17 is initially compressed before the damper 16 becomes active when the front section 13 is folded back further. In this way, the impact of the front section 13 on the piston rod 162 or the cap 163 can be further reduced in noise. The initially low magnetic forces during the folding back of the front section 13, which under certain circumstances would not be sufficient to actuate the damper 16, are sufficient to initially compress the spring arrangement 17. The restoring forces for the front section 13, which increase as the magnets 15 approach each other further, are then sufficient to actuate the damper 16, so that the further folding back of the front section 13 takes place in a damped manner by the damper 16.

Provision can be made to block the pivoting of the front section 13 in order to prevent the door 1 from being opened in accordance with the application in the event of pressure or tension. For this purpose, for example, a screw or a pin can be guided through a bore in the front section 13 into the base plate 12 or the base body 11 . Other facilities to swivel to block the front section 13 are conceivable, for example via a rotary lever or slide, which allows a simple change between an approved and a blocked pivotability of the front section. Furthermore, it is also possible to carry out the blocking in a controlled manner via an electrical, magnetic and/or electromagnetic component, for example an actuator.

In the exemplary embodiment shown, a case with a starting bevel is shown. However, the basic principle shown of a trap with a pivotable front section can also be implemented in other types of traps, for example in a magnetic trap. With a suitable arrangement, the at least one magnet that holds the front section of the latch in the basic pivoted position can simultaneously serve as a magnet that pulls the latch into the opening of the striking plate or that is involved in this pulling-in process with its magnetic forces.

Reference List

1

door

2

fishing rod

3

face milling

4

door lock

5

Frame

6

recess

7

locking plate

10

Cases

11

slider

111

face

112

Recess for damper

12

base plate

121

hinge eyelet

122

deepening

123

drilling

13

front section

14

pivot axis

15

magnet

16

mute

161

cylinder

162

piston rod

163

cap

17

spring assembly

Claims (14)

Latch (10) for a door lock (4) having a pivotable front section (13), characterized in that the latch (10) has at least one magnet (15) which holds the front section (13) in a basic pivoted position . Latch (10) according to Claim 1, in which the front section (13) is connected to a base body (11) via a hinge. Latch (10) according to Claim 2, in which a pivot axis (14) of the hinge is aligned vertically in the installed position of the latch (10). Latch (10) according to Claim 3, in which the pivot axis (14) in the installed position of the latch (10) is arranged on the leading side of the latch (10) when the door lock (4) is closed. Latch (10) according to one of Claims 2 to 4, in which a base plate (12), to which the hinge is fastened, is arranged on the base body (11). Trap (10) according to one of Claims 1 to 5, in which the at least one magnet (15) is arranged in the front section (13) and/or in the base plate (12). Trap (10) according to one of Claims 1 to 6, having a damper (16) which dampens a return movement of the front section (13) into the basic pivoting position. Trap (10) according to Claim 7, in which the damper (16) is a linear damper which is fitted with a cylinder (161) in a recess (112) of the base body (11) and with a piston rod (162) on the front section (13) works. A trap (10) as claimed in claim 8, wherein the damper (16) is fitted into the recess together with a spring arrangement (17) such that the damper (16) is urged towards the base plate (12) by the spring arrangement (17). becomes. Latch (10) according to one of Claims 1 to 9, having a blocking means by which the front section (13) can be firmly coupled to the base body (11) in the basic pivoted position. Latch (10) according to Claim 10, in which a pin, bolt or screw is provided in order to block the pivoting of the front section (13) with respect to the base body (11). Latch (10) according to Claim 10 or 11, in which the pivotability of the front section (13) relative to the base body (11) can be blocked in a controlled manner via an electrical, magnetic and/or electromagnetic component. Door lock (4) for a door (1), having a latch (10) according to one of Claims 1 to 12. Door lock (4) according to Claim 13, designed as a mortise lock.

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