EP4148210B1 - Door lock and latch for a door lock - Google Patents

Description

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

A door lock usually has a bolt that moves into an opening in a strike plate when the door lock is in a closed position. Typically, the door lock with the extendable bolt is attached to the door and the striking 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 spring force and has a starting slope in its front section, through which the latch is initially pressed in when the door is closed. As an alternative, magnetic traps are known, which are moved into the striking plate using magnetic forces after the door is closed.

The latch is often coupled with a handle in the lock and a handle above it 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 applying appropriate pressure or pull on it without pushing down the handle, even if the latch is retracted into the striking plate. In hospitals or other public buildings, for example, this can serve as a protective measure against infections from germs that could be on the handles.

From the publication DE 20 2021 101 478 U1 a trap of the type mentioned is known, in which the front section is designed to be pivotable. The publication describes a latch with a starting slope through which the latch is pressed in when the door is closed, so that the door can be closed even without operating the latch. This section of the latch, which has the starting slope, is pivotable and spring-loaded so arranged on a base body of the latch that when pressure is applied to the closed door in the opening direction, this pivotable section swings open and releases the door. In this way, the door can be opened by pressing against it with e.g. B. the shoulder or the foot possible, even without having to touch the handle. A spring is provided which holds the pivoting section in the position that this section would have in a trap which 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 only release the door when there is sufficient pressure to open it. Otherwise, differences in air pressure or something similar would be enough to open the door. By using a spring with a high spring force and appropriate preload, the trigger point can be selected appropriately, but a relatively high force is then required to continue the pivoting process until the latch moves out of the striking plate and the door can be opened . In addition, such a spring with a corresponding spring constant requires a relatively large installation space compared to the size of the trap and is therefore not easy to integrate into a trap.

It is an object of the present invention to create a trap of the type mentioned at the outset, which is triggered when a certain pressure or pulling force is applied against the door and, after being triggered, can be moved out of the striking plate with as little force as possible. It is another task to describe a door lock with such a trap.

This task is solved by a latch or a door lock with the respective features of the independent claims. Advantageous designs and further developments are the subject of the dependent claims.

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

Compared to the spring-loaded holding of the front section in a basic pivoting position known from the prior art, this results Through the use of the magnets, an advantageous force-angle functional relationship between a necessary force to swing open the front section depending on a pivot angle of the front section. When using a spring, the force required to fold over the front section increases with the pivot angle. By using the magnets according to the invention, however, a large holding force is achieved for the front section in the basic pivoting position. As soon as this has been overcome and the front section begins to open, the force required for further swinging is reduced rapidly as the pivot angle increases due to the large distance dependence of the magnetic forces. 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 installed 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 over, it then levers the base body into the door lock against the disengagement direction of the latch into a housing, whereby the door can be opened without the latch running the risk of jamming in the striking plate.

In a further advantageous embodiment of the trap, a base plate to which the hinge is attached is arranged on the base body. The at least one magnet is then preferably arranged in the front section of the trap and/or in the base plate. A magnet that is located in the base plate or the front section is basically sufficient if a ferromagnetic counter-element is arranged in the 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 the front section, which attract each other.

In a further advantageous embodiment, the trap has a damper which dampens the movement of the front section back into the basic pivoting position. The damper can, for example, be a linear damper which is inserted with a cylinder into a recess in the base body and acts on the front section with a piston rod. The damper will cause a possible Prevents annoying noise when the front section is folded back.

The damper can be inserted into the recess together with a spring arrangement, such that the damper is pressed towards the base plate by the spring arrangement. This spring arrangement biases the damper in the direction of the base plate, so that when the front section is folded back, the spring arrangement is initially 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. A cap made of a softer material can also be placed on the piston rod, which already reduces noise.

In a further advantageous embodiment, the latch has a blocking option, through which the front section can be firmly coupled to the base body in the basic pivoting position. This means that 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 relative to the base body. In a further development, provision can be made to block the pivotability of the front section relative to the base body in a controlled manner via an electrical, magnetic and/or electromagnetic component. The additional function of contactless opening according to the invention can then advantageously be provided or prevented automatically, for example in a time-controlled manner, 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 door lock has the advantages explained above in connection with the latch. The door lock is preferably designed as a mortise lock and can therefore 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 latch according to the application;

Fig. 1b

a detailed view of the Figure 1a ;

Fig. 2, 3

various sectional views of a latch of the door lock according to Figures 1a , b;

Fig. 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 front side of the door 1 there is a milling 3 into which the door lock 4 is mounted in the manner of a mortise lock.

The door lock 4 has a retractable and extendable latch 10, which moves into an opening in the strike plate 7 when the door 1 is closed. In the example shown, the striking plate 7 is mounted on the frame 5 in the area of a recess 6.

The latch 10 has a slider 11 with which it is mounted in the door lock 4 in a longitudinally displaceable manner. At a front end of the slide 11 pointing in the direction of the striking plate 7, a base plate 12 is arranged, on which a front section 13 of the latch 10 is pivotally 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 in the installed position of the latch 10 and lies on the side of the latch 10 that leads when the door 1 is closed. The front section 13 of the latch 10 shown has a starting slope through which the latch 10 can be opened by simply pressing the door 10 closed is first pressed into the door lock 4 against a spring force, in order then to move into the opening of the strike plate 7 under 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 tension 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 latch 10 being able to be opened using a door handle, not shown here.

In order to prevent unwanted opening, for example due to a draft, the front section 13 may only open relative to the base body 12 when a certain force acts on the front section 13 in the transverse direction. According to the application, for this purpose the front section 13 is held in the non-folded basic pivot position by at least one magnet 15, which are 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 more detail in various representations. Figure 2 shows a sectional view through the latch 10 in a horizontal sectional plane (with the latch normally installed in a vertically oriented door), Figure 3 shows a vertical section through the trap 10 and Figure 4 a spatial exploded view of the trap 10. The ones in the Figures 2 and 3 The illustrated, not unfolded pivot position of the front section 13 is also referred to as the basic pivot position in the context of this application.

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

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

Comparable depressions can also be formed in the front section 13 in order to accommodate two more of the magnets 15. The magnetization direction of the magnets 15 is chosen so that the magnets 15 in the base plate 12 and those in the front section 13 attract each other and thus the front section 13 is held in the non-folded basic pivot position by the magnets. In alternative embodiments, round magnets can also be used instead of the cuboid magnets 15. Furthermore, the number of four magnets 15 is purely an example. 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 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 pivot position under spring force lies in a suitable functional context of a necessary force for pivoting the front section 13 open depending on a pivot angle. When using a spring, the force required to fold over the front section 13 increases with the pivot angle. By using the magnets 15 according to the application, however, 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 unfold, the force required for further pivoting is reduced rapidly as the pivot angle increases due to the large distance dependence of the magnetic forces. 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 easily and a shaky opening process is prevented.

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

In order to prevent a potentially 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 spring force. When pressure is applied to the piston rod 162 in the direction of the cylinder 161, the piston rod 162 retracts into the cylinder 161 in a damped manner. The damper 16 is arranged with its cylinder 161 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 rests against its base in the basic pivoting position of the front section 13. If the front section 13 folds over, the piston rod 162 of the damper can extend through the bore 123 and protrudes accordingly 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 guided in a dampened manner into the basic pivoting position. In order to avoid noise as much as possible when the front section 13 hits the piston rod 162, in the exemplary embodiment shown, 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, a spring arrangement 17 is also present in the direction of insertion 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 first 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 small magnetic forces when the front section 13 is folded back, 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 further approach each other, are then sufficient to actuate the damper 16, so that the further folding back of the front section 13 is dampened by the damper 16.

It can be provided to block the pivoting of the front section 13 in order to prevent the opening of the door 1 according to the application under pressure or tension. For this purpose, for example, a screw or a pin can be guided through a hole in the front section 13 into the base plate 12 or the base body 11. Other facilities to pivot Blocking the front section 13 is conceivable, for example via a rotary lever or slider, which enables a simple change between permitted and blocked pivoting 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 trap with a starting slope 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 a magnetic trap. With a suitable arrangement, the at least one magnet that holds the front section of the latch in the basic pivoting position can simultaneously serve as a magnet that pulls the latch into the opening of the striking plate or that participates in this retraction process with its magnetic forces.

Reference symbol list

1

door

2

fishing rod

3

milling on the front

4

Door lock

5

Frame

6

recess

7

strike plate

10

Cases

11

Slider

111

front side

112

Recess for damper

12

base plate

121

hinge eye

122

deepening

123

drilling

13

front section

14

Pivot axis

15

magnet

16

mute

161

cylinder

162

Piston rod

163

cap

17

Spring arrangement

Claims (14)

1. 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 pivot position with a holding force, wherein the front section (13) folds over when the holding force is overcome if sufficient pressure or tension is exerted on a door (1) in which the door lock (4) with this latch (10) is inserted.
2. Latch (10) according to claim 1, in which the front section (13) is connected to a base body (11) via a hinge.
3. Latch (10) according to claim 2, in which a pivot axis (14) of the hinge is aligned vertically in the installation position of the latch (10).
4. Latch (10) according to claim 3, in which the pivot axis (14) is arranged in the installation position of the latch (10) on the side of the latch (10) that faces forwards when the door lock (4) is closed.
5. Latch (10) according to one of claims 2 to 4, in which a base plate (12) is arranged on the base body (11), to which the hinge is fastened.
6. Latch (10) according to any one of claims 1 to 5, wherein the at least one magnet (15) is arranged in the front section (13) and/or in the base plate (12).
7. Latch (10) according to one of claims 1 to 6, comprising a damper (16) which dampens a return movement of the front section (13) into the basic pivot position.
8. Latch (10) according to claim 7, wherein the damper (16) is a linear damper which is inserted with a cylinder (161) into a recess (112) of the base body (11) and acts with a piston rod (162) on the front section (13).
9. Latch (10) according to claim 8, in which the damper (16) is inserted into the recess together with a spring arrangement (17) in such a way that the damper (16) is pressed in the direction of the base plate (12) by the spring arrangement (17).
10. Latch (10) according to any one of claims 1 to 9, comprising a blocking means by which the front section (13) can be firmly coupled to the base body (11) in the basic pivot position.
11. Latch (10) according to claim 10, wherein a pin, bolt or screw is provided to block the pivotability of the front section (13) relative to the base body (11).
12. 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.
13. Door lock (4) for a door (1), comprising a latch (10) according to one of claims 1 to 12.
14. Door lock (4) according to claim 13, designed as a mortise lock.

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