EP2339239A2 - Door locking device for a domestic appliance - Google Patents

Abstract

The door lock (1) has a treatment room (5) arranged in a body. The treatment room is closed by a door. A door sensor device is provided to detect whether the door is locked. A lock device is provided for locking the door in a secured manner. The locking device comprises a locking hook, which is incorporated between the opening position and the locking position in a pivoted and longitudinally displaceable manner. An independent claim is also included for a household appliance has a housing.

Description

The present invention relates to a door lock for a household appliance and a household appliance equipped therewith. In particular, the present invention is used on ovens with pyrolysis function, but can also be used on other household appliances for locking the door of a treatment room. For example, the door of a washing machine or dishwasher or other household appliance can be equipped with a door lock according to the invention.

Especially in ovens with pyrolysis function, it is important to lock the door of the cooking chamber during the implementation of pyrolysis in order to reliably protect the user from the pyrolysis in the extremely high temperatures. To comply with the maximum surface temperatures of the cooking chamber is still flows around in carrying out the pyrolysis of an air flow in air ducts, so that the outer surface of the oven has tolerable temperatures.

Due to the additional air ducts, the overall space requirement is limited, so that the installation space of the components used is an important parameter.

With the DE 10 2006 024 899 B3 is a door lock for a household appliance has become known, the door lock allows a reliable and safe operation. In this known door lock a rotatably received on a shaft closing piston is pivoted during the door lock from its horizontal position to a vertical orientation and pulled in the vertical orientation to the rear to reliably lock the door. This door lock provides safe operation, however, the space requirement is relatively large and it is a variety of interacting components needed.

Against the background of this known prior art, it is the object of the present invention to provide a further door lock available, with which a relatively small footprint and in particular a relatively low height can be achieved.

This object is achieved with a door lock according to the invention with the features of claim 1. Preferred developments are subject of the dependent claims. Further advantages and features of the present invention will become apparent from the embodiment.

The door lock according to the invention is particularly intended for use on a household appliance, which has a treatment chamber arranged in a body, which can be closed by a door. At least one door sensor device is provided to detect if the door is closed. At least one closure device is provided to securely lock the door. In this case, the closure device is movable at least from a locking position into at least one open position. The closure device comprises at least one closure hook, which is received by means of a rotatable eccentric between the open position and the locking position pivotable and longitudinally displaceable. In this case, the locking hook is moved during the rotation of the eccentric from the open position to the locking position along its longitudinal direction.

The door lock according to the invention has many advantages. A significant advantage of the door lock according to the invention is the simple structure and the overall smaller space requirement. The rotatable eccentric also makes it possible to remove a drive of the eccentric from the plane of the closure device and to arrange it in a vertically offset plane.

In particular, the eccentric is driven by a particular electric motor with which the eccentric is rotatably connected. The electric motor can be arranged vertically above the closure device. It is possible, for example, that the door lock above the treatment room is at least partially disposed in an air inlet duct. The rotatable eccentric makes it possible to arrange the motor above the top wall of the air inlet duct. As a result, the space within the air inlet duct decreases significantly, so that the treatment room can be increased, for example.

Preferably, the eccentric on at least one driver which acts on at least one position sensor via at least one lever. As a result, a detection of the position of the eccentric and thus also of the locking hook is advantageously made possible. For example, it is important in ovens with pyrolysis if, before starting the pyrolysis function, the position of the at least one locking hook is queried and the implementation of the pyrolysis program is only possible when the locking hook is in the locked position.

Preferably, at least two limit switches are provided as position sensors for the position of the locking hook. Preferably, different limit switches are activated at least in the two end positions, namely the open position and the locking position. But it is also possible that intervening positions are detected by suitable position sensors.

In preferred developments, the closure hook can be preloaded with a preloading spring into the locking position. Such a configuration is very advantageous because the lock is ensured even in the de-energized state via the bias spring. This means that even with power failure and the like, there is still a reliable lock. On the other hand, e.g. In case of power failure, the force of the preload spring are overcome manually to release the lock if necessary.

Preferably, the door sensor device comprises at least one Taststößel, wherein the Taststößel is movable in particular between a closed position and an open position. The closed position indicates that the door is closed and the open position indicates that the door is open. Advantageously, at least one position sensor for detecting at least one position of the Taststößels is provided to interrogate, for example, before the start of the pyrolysis function, the result of a second sensor for safety's sake.

Advantageously, the Taststößel is biased in the open position, so that the Taststößel is movable only against the force of a preloading in the closed position.

In certain embodiments, the Taststößel may have at least one locking lug which limits at least in the open position a rotational movement of the eccentric. Such a configuration is particularly advantageous because it can be prevented by the limitation of the rotational movement of the eccentric that the locking hook moves into the locking position, although the door is not closed.

It is also possible that the biasing device prevents a rotational movement of the eccentric depending on their position. For example, the biasing device may be designed as a tension spring and act on a lever depending on their position, so that the lever only certain rotational movements of the eccentric permits.

In other embodiments, it is preferred that the Taststößel is biased with the tension spring in the open position. This has the advantage that a basic position, namely the open position, is specified via the tension spring. By direct contact of the tension spring with the lever for limiting the rotational movement of the eccentric can be reliably avoided that the position sensor for detecting the position of the Taststößels a closed door pretends, although the door is not closed, for example, forgetting the tension spring during assembly has been. Missing the tension spring during assembly, this leads in this embodiment to the fact that the rotational movement of the eccentric is limited, so that the eccentric his Can not reach locking position. This in turn means that the limit switch is not activated and thus can not start the pyrolysis function.

Consequently, a reliable and safe operation of the household appliance according to the invention is ensured by means of these simple means.

In preferred embodiments, the door lock according to the invention is used in a household appliance, which has a housing and a treatment space provided thereon with a feed opening. A door closing the feed opening is provided, which can be opened to feed the treatment room. A door lock, as described above, serves to secure the closure of the loading opening.

In preferred embodiments, the locking latch of the door latch is provided in an air intake passage above the treatment space, and the motor for driving the cam lock eccentric is provided in a space above the air intake passage. The local separation of the engine and the eccentric with the locking hook a particularly low height can be achieved in the air intake duct. In a specific embodiment, it has been possible to achieve a space in the vertical direction in the air inlet duct of 35 mm.

The eccentric leads during its movement to a longitudinal displacement of the locking hook. The longitudinal displacement is preferably greater than 2 mm and is preferably in a range of 3 mm and 10 mm and is particularly preferably about 5 mm.

In all embodiments, the engine may be designed as a synchronous motor. It is possible that the motor reverses its direction of rotation when overloaded. Then the direction of rotation with which it starts can be dependent on the current phase position of the network and thus be random. When the door lock is closed and the door lock is to be opened, the motor will either run in the right direction, or it will change direction after it has gone against an end stop. The same applies to the transfer of the closure hook from the open position to the locked position.

Further advantages and features of the present invention will become apparent from the embodiment, which will be explained below with reference to the accompanying figures.

Fig. 1

eine schematische Ansicht eines Herdes mit einem integrierten Backofen;

Fig. 2

eine schematische Seitenansicht des Backofens nach Fig. 1;

Fig. 3

eine schematische Frontansicht des Backofens nach Fig. 1;

Fig. 4

ein schematische Draufsicht auf die Türverriegelung des Backofens nach Fig. 1;

Fig. 5

ein weitere schematische Draufsicht auf die Türverriegelung des Backofens nach Fig. 1;

Fig. 6

die Türverriegelung des Backofens nach Fig. 1 in einer schematischen Draufsicht in Öffnungsstellung;

Fig. 7

die Türverriegelung des Backofens nach Fig. 1 in einer schematischen Draufsicht in Verschlussstellung; und

Fig. 8

die Türverriegelung des Backofens nach Fig. 1 in einer schematischen Draufsicht in Verriegelungsstellung.

Show:

Fig. 1

a schematic view of a stove with an integrated oven;

Fig. 2

a schematic side view of the oven according to Fig. 1 ;

Fig. 3

a schematic front view of the oven according to Fig. 1 ;

Fig. 4

a schematic plan view of the door lock of the oven after Fig. 1 ;

Fig. 5

a further schematic plan view of the door lock of the oven after Fig. 1 ;

Fig. 6

the door lock of the oven behind Fig. 1 in a schematic plan view in the open position;

Fig. 7

the door lock of the oven behind Fig. 1 in a schematic plan view in the closed position; and

Fig. 8

the door lock of the oven behind Fig. 1 in a schematic plan view in the locked position.

In Fig. 1 is a highly schematic way an inventive household appliance 2 shown, which includes a 3 oven. Here, the household appliance 2 is designed as a standalone unit and has four separate cooking zones 30 for cooking. But it is also possible that the household appliance 2 is designed as a built-in appliance and has only a treatment room 5 or 3 oven.

The feed opening 28 of the treatment chamber 5 is closed by a door 6, which may be partially transparent or completely transparent, to allow an insight into the interior of the treatment chamber 5.

The household appliance 2 has a housing 27. The oven 3 may have its own body 4. The body can also be identical to the housing 27 of the household appliance 2.

In particular, the setting of a pyrolysis function is thus possible in which, under particularly high temperatures, residues in the treatment chamber 5 are burned in order to clean the treatment chamber 5 in this way. Due to the high temperatures acting during a pyrolysis function, it is important to ensure the correct closure of the door 6 during the pyrolysis function so that the pyrolysis function can not be activated when the door 6 of the household appliance 2 is not closed.

For locking a door lock 1 is provided, with respect to the Fig. 2 to 8 will be explained in more detail below.

In Fig. 2 Fig. 2 is a side view of the household appliance 2, with individual components omitted to facilitate clarity.

On the body 4, the door 6 is provided. Above the door 6, the front panel 35 is arranged. Vertically between the door 6 and the front panel 35, an air inlet 32 is provided, behind which the door lock 1 is arranged.

The door lock 1 is provided substantially in the air inlet duct 29, which is arranged above the treatment chamber 5 to cool the outer parts of the household appliance 2 during the pyrolysis function, to ensure that the permissible surface temperature of the household appliance 2 is not exceeded even during the pyrolysis function ,

Above the air inlet duct 29, the electric motor 14 for driving the door lock 1 is arranged here. This makes it possible that the space in the vertical direction in the air inlet channel 29 can be significantly reduced and more than halved in the selected embodiment. The drive shaft of the motor 14 stands with the axis of rotation 34 of the eccentric 12 (see Fig. 4 ff.) in rotary connection.

In Fig. 3 is a front view of the treatment room 5 with the door 6 open. A seal 36 serves for sealing between the body 4 of the household appliance 2 and the door 6.

In Fig. 4 the door lock 1 is shown with the locking hooks 11, the motor 14 has been omitted for clarity. At the in Fig. 4 shown position is the Taststößel 22 executed door sensor device 7 in the open position 24. In this position, the Taststößel 22 protrudes significantly forward.

The locking hook 11 is in Fig. 4 shown in the closed position 9, in which the locking hook 11 can engage behind a vertically arranged locking bolt.

The locking hook 11 is arranged on the eccentric 12 verschenkbar. The eccentric 12 allows a displacement of the locking hook 11 in the longitudinal direction 13 of the locking hook. In the illustrated embodiment, the longitudinal displacement is about 5 mm. This reliably ensures that, for example, during a pyrolysis function, the door 6 rests tightly against the body 4.

Position sensors 17 are provided for detecting an end position of the Taststößels 22 and the end positions of the locking hook 11. A lever 16 transmits the position of the eccentric 12 and thus of the locking hook 11 in the end positions on the limit switches 18 and 19.

When the tactile plunger 22 of the in Fig. 4 shown open position in the in Fig. 5 shown closing position 23 is transferred, the key of the plunger 22 associated position sensor 17 and outputs to the control electronics signal that the door 6 is closed.

The Taststößel 22 is on the tension spring 26 in the in Fig. 4 shown open position 24 biased.

The eccentric 12 is arranged rotatably about the axis of rotation 34 and is on the in 4 and 5 Motor 14, not shown, driven.

With reference to the Fig. 6 to 8 The following explains how it works. It is in Fig. 6 the door lock 1 in turn without motor 14 shown. In Fig. 6 The locking latch 11 is pivoted back into the open position 10 and can be passed, for example, to a locking bolt to then engage behind him and thus lock the door. The Taststößel 22 is in the open position 24th

For better clarity was in Fig. 6 to 8 omitted the tension spring 26, which the Taststößel 22 in the open position 24 (see. Fig. 4 ) preloaded. One end of the tension spring 26 engages a locking lug 25 of the Taststößels. This locking lug 25 leads in the in Fig. 6 Open position shown 24 to the fact that the driver 15 of the eccentric 12 abuts in a further rotation against the locking lug 25 and thus prevents further rotation of the eccentric 12 in the locking position 21. Similarly, it is possible that the lever 16 prevents further rotational movement of the eccentric 12 when the driver 15 abuts against the lever 16.

In order to allow a further rotational movement of the eccentric 12, the Taststößel 22 of the in Fig. 6 Open position 24 shown in the in Fig. 8 shown closed position 23 are transferred.

When the plunger 22 is in the open position 24, although a rotational movement of the eccentric 12 of the in Fig. 6 illustrated opening position in the in Fig. 7 shown Verschließstellung 9 possible, but a transfer to the locking position 21 is not possible. Only in the locking position 21 is executed via the limit switch 19 as Position sensor 17 outputs the signal that the door is locked. For safety, the signal of the position sensor 17 of the Taststößels 22 can be queried simultaneously, which only outputs the signal "closed" when the Taststößel 22 in the in Fig. 8 shown closing position 23 is located.

The transfer of the eccentric 12 in the in Fig. 8 illustrated locking position 21 is made possible by the fact that the locking lug 25 and the tension spring 26 has been pushed far enough into the door latch 1, so that the blocking effect has been lifted.

Overall, the invention provides a reliable and simple door lock 1 for household appliances available, the engine above the air inlet duct can be arranged so that the required space within the air inlet duct is low. As a result, the cooking space can be increased overall. The door lock according to the invention is simple in construction and represents a reliable safeguard against incorrect operation.

reference numeral

1

door lock

2

household appliance

3

oven

4

corpus

5

treatment room

6

door

7

Door sensor device

8th

closure device

9

closed position

10

open position

11

lock jaw

12

eccentric

13

longitudinal direction

14

engine

15

takeaway

16

lever

17

position sensor

18, 19

limit switch

20

biasing spring

21

locking position

22

Taststößel

23

closed position

24

open position

25

locking tab

26

mainspring

27

casing

28

loading port

29

Air inlet duct

30

cooking zone

31

control

32

air intake

33

Ceiling of the treatment room

34

axis of rotation

35

front panel

36

poetry

Claims (11)

Door lock (1) for a domestic appliance (2) with a treatment chamber (5) arranged in a body (4), which can be closed by a door (6), at least one door sensor device (7) being provided to detect whether the Door (6) is closed,
at least one closure device (8) being provided in order to secure the door (6), the closure device (8) being movable from at least one locking position (21) into at least one open position (10),
characterized,
in that the closure device (8) comprises at least one closure hook (11) which is received in a pivotable and longitudinally displaceable manner by means of a rotatable eccentric (12) between the open position (10) and the locking position (21), the closure hook (11) being rotated during the rotation of the Exzenters (12) from the open position (10) in the locking position (21) along its longitudinal direction (13) is moved. Door lock (1) according to claim 1, wherein a motor (14) is provided, with which the eccentric (12) is rotatably connected. Door lock (1) according to claim 1 or 2, wherein the eccentric (12) has a driver (15) which acts on at least one position sensor (17) via at least one lever (16). Door lock (1) according to at least one of the preceding claims, wherein at least two limit switches (18, 19) are provided as position sensors (17). Door lock (1) according to at least one of the preceding claims, wherein the closure hook (11) with a biasing spring (20) in the locking position (21) is preloaded. Door lock (1) according to at least one of the preceding claims, wherein the door sensor device (7) comprises at least one Taststößel (22), wherein the Taststö-βel (22) in particular between a closed position (23) and an open position (24) is movable. Door lock (1) according to at least one of the preceding claims, wherein the Taststößel (22) is biased in the open position (24). Door lock (1) according to at least one of the preceding claims, wherein the Taststößel (22) has at least one locking lug (25) which limits at least in the open position (24) a rotational movement of the eccentric (12). Door lock (1) according to at least one of the preceding claims, wherein the Taststößel (22) with a tension spring (26) is biased in the open position (24). Household appliance (1) having a housing (27) and a treatment space (5) provided thereon, and a charging opening (28) and a door (6) closing the charging opening (28), which can be opened to charge the treatment space (5), wherein a door lock (1) for the secure closure of the feed opening (28) is provided according to one of the preceding claims. Domestic appliance (1) according to claim 10, wherein the locking hook (11) of the door lock (1) in an air inlet duct (29) and the motor (14) above the air inlet duct (29) are provided.

Images