DE102009059313A1 - Door lock for a household appliance - Google Patents

Abstract

Door lock (1) for a household appliance (2) with a treatment room (5) arranged in a body (4), which can be closed by a door (6). A door sensor device (7) is provided to detect whether the door (6) is closed. A locking device (8) is provided to securely lock the door (6), the locking device (8) being movable from a locking position (21) to an open position (10). The locking device (8) comprises a locking hook (11) which is pivotably and longitudinally displaceable between the open position (10) and the locking position (21) by means of a rotatable eccentric (12), the locking hook (11) during the rotation of the eccentric ( 12) is moved from the open position (10) into the locking position (21) along its longitudinal direction (13).

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. It is also possible that between them 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, for. B. 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 can not reach its 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.

Show:

1 a schematic view of a stove with an integrated oven;

2 a schematic side view of the oven according to 1 ;

3 a schematic front view of the oven according to 1 ;

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

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

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

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

8th the door lock of the oven behind 1 in a schematic plan view in the locked position.

In 1 is in a highly schematic way an inventive household appliance 2 pictured, which has an oven 3 includes. Here is the household appliance 2 designed as a standard unit and has four separate cooking zones 30 to cook up. It is also possible that the household appliance 2 is executed as a built-in device and only a treatment room 5 or oven 3 features.

The loading opening 28 the treatment room 5 will be over a door 6 sealed, which can be made partially transparent or completely transparent, to gain insight into the interior of the treatment room 5 to enable.

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

controls 31 serve to control the household appliance 2 , In particular, the setting of a pyrolysis function is thus possible in the case of particularly high temperatures residues in the treatment room 5 be burned to the treatment room 5 to clean so. Due to the high temperatures acting during a pyrolysis function, it is important to have the door properly closed 6 during pyrolysis to ensure that the pyrolysis function can not be activated when the door 6 of the household appliance 2 not closed.

To lock is a door lock 1 provided with reference to the 2 to 8th will be explained in more detail below.

In 2 is a side view of the household appliance 2 shown, with individual components have been omitted to facilitate the overview.

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

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

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

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

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

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

The locking hook 11 is about the eccentric 12 arranged as a gift. The eccentric 12 allows a shift of the locking hook 11 in the longitudinal direction 13 of the lock hook. In the illustrated embodiment, the longitudinal displacement is about 5 mm. This reliably ensures that during, for example, a pyrolysis the door 6 close to the body 4 is applied.

position sensors 17 are for detecting an end position of the Taststößels 22 and the end positions of the locking hook 11 intended. A lever 16 transfers the position of the eccentric 12 and thus the lock hook 11 in the end positions on the limit switches 18 and 19 , When the tactile plunger 22 from the in 4 shown open position in the in 5 shown closed position 23 is transferred, which switches the Taststößel 22 assigned position sensor 17 and gives the signal to the control electronics that the door 6 closed is.

The tactile plunger 22 is about the mainspring 26 in the in 4 illustrated open position 24 preloaded.

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

With reference to the 6 to 8th The following explains how it works. It is in 6 the door lock 1 again without engine 14 shown. In 6 is the door lock 1 Total in the open position 10 , The locking hook 11 is in the open position 10 pivoted back and can be passed, for example, on a locking bolt to then engage behind him and thus lock the door. The tactile plunger 22 is in the open position 24 ,

For better clarity was in 6 to 8th the tension spring 26 omitted the stylus 22 in the open position 24 (see. 4 ) preloaded. One end of the tension spring 26 accesses a locking nose 25 of the Taststößels. This locking nose 25 leads in the in 6 shown open position 24 to that the driver 15 of the eccentric 12 in a further rotation against the locking lug 25 pushes and thus a further rotational movement of the eccentric 12 in the locking position 21 prevented. It is equally possible that the lever 16 another rotary motion of the eccentric 12 prevents when the driver 15 against the lever 16 strikes.

To another rotation of the eccentric 12 to enable the tactile plunger 22 from the in 6 shown open position 24 in the in 8th shown closed position 23 be transferred.

When the pestle 22 in the open position 24 Although there is a rotational movement of the eccentric 12 from the in 6 illustrated opening position in the in 7 illustrated Verschließstellung 9 possible, but a transfer to the locked position 21 can not. Only in the locked position 21 is about the limit switch 19 executed position sensor 17 the signal is output that the door is locked. For safety, the signal of the position sensor can be used simultaneously 17 of the Taststößels 22 be queried, which only outputs the signal "closed" when the Taststößel 22 in the in 8th shown closing position 23 located.

The transfer of the eccentric 12 in the in 8th illustrated locking position 21 This is made possible by the locking nose 25 or the tension spring 26 far enough into the door lock 1 was pushed in, so that the blocking effect was lifted.

Overall, the invention provides a reliable and simple door lock 1 for household appliances, wherein the engine can be arranged above the air inlet duct, 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.

LIST OF REFERENCE NUMBERS

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

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006024899 B3 [0004]

Claims (11)

Door lock ( 1 ) for a household appliance ( 2 ) with a in a body ( 4 ) arranged treatment room ( 5 ), through a door ( 6 ) is closable, wherein at least one door sensor device ( 7 ) is provided to detect whether the door ( 6 ) is closed, wherein at least one closure device ( 8th ) is provided to the door ( 6 ), whereby the closure device ( 8th ) at least from a locking position ( 21 ) in at least one open position ( 10 ), characterized in that the closure device ( 8th ) at least one locking hook ( 11 ), which by means of a rotatable eccentric ( 12 ) between the open position ( 10 ) and the locking position ( 21 ) is received pivotably and longitudinally displaceable, wherein the closure hook ( 11 ) during the rotation of the eccentric ( 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 an engine ( 14 ) is provided, with which the eccentric ( 12 ) is rotatably connected. Door lock ( 1 ) according to claim 1 or 2, wherein the eccentric ( 12 ) a driver ( 15 ), which via at least one lever ( 16 ) to at least one position sensor ( 17 ) acts. Door lock ( 1 ) according to at least one of the preceding claims, wherein at least two limit switches ( 18 . 19 ) as position sensors ( 17 ) are provided. Door lock ( 1 ) according to at least one of the preceding claims, wherein the closure hook ( 11 ) with a preload 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 ) at least one Taststößel ( 22 ), wherein the Taststößel ( 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 ) into the open position ( 24 ) is preloaded. Door lock ( 1 ) according to at least one of the preceding claims, wherein the Taststößel ( 22 ) at least one locking nose ( 25 ), which at least in the open position ( 24 ) a rotary movement of the eccentric ( 12 ) limited. Door lock ( 1 ) according to at least one of the preceding claims, wherein the Taststößel ( 22 ) with a tension spring ( 26 ) into the open position ( 24 ) is preloaded. Household appliance ( 1 ) with a housing ( 27 ) and a treatment room ( 5 ), and a loading opening ( 28 ) and one of the loading opening ( 28 ) closing door ( 6 ), which are used to charge the treatment room ( 5 ) can be opened, with a door lock ( 1 ) for the secure closure of the loading opening ( 28 ) is provided according to one of the preceding claims. Household appliance ( 1 ) according to claim 10, wherein the closure hook ( 11 ) of the door lock ( 1 ) in an air intake duct ( 29 ) and the engine ( 14 ) above the air inlet duct ( 29 ) are provided.

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