DE102015201944B4 - Door lock with door detection - Google Patents

Abstract

Door lock for household appliances, comprising: - a housing (12) having an opening (14) for inserting a hook, which is held by a door of a household appliance; - A cam (16) which is rotatable relative to the housing (12) about a first axis (A) between a holding position and a release position, wherein in the stop position, the cam (16) is adapted to the hook in the position locked at a closed door, - a slider (20) which cooperates with the cam (16) and is movable between an unlocked position and a closed position, wherein in the closed position, the slider (20) locks the cam (16) in the holding position A locking pin (28) adapted to lock the slider in the locking position, and a door detecting device (30) having a door detecting pin (32) which is disposed between a position at an open door and a position at a closed position Door is movable, characterized in that the slide (20) carries a hysteresis element (34) which relative to the slide (20) between a first Po position and a second position is movable and elastically pushed to the first position, wherein the hysteresis element (34) has a flat surface (40), an inclined ramp (42) which ends at the flat surface (40), and a Step (44) between the flat surface (40) and the inclined ramp (42), wherein the door detection pin (32) is urged into contact with the hysteresis element (34), wherein during the movement of the slider (20) of the unlocked position into the lock position, the hysteresis element (34) is in the first position and the door detection pin (32) lies on the flat surface (40) of the hysteresis element (34), and during movement of the slider (20 ) from the lock position to the unlocked position, the door catch pin (32) abuts the inclined ramp (42) and holds the hysteresis element (34) in the second position.

Description

Field of the invention

The present invention relates to a door lock for household appliances, such. As washing machines, dryers, washer-dryers and the like.

Background of the invention

A door lock for home appliances is an electromechanical device designed to lock the door of a machine in a closed position. In certain cases, the door lock is also provided with a door detection circuit which provides information about the open / closed state of the door.

From the DE 199 60 814 A1 is a door closure for example, a dishwasher known, which has a pivotally arranged with a fixed locking pin cooperating locking lever. Complete monitoring of the movement sequence of the door is possible because a rotary position detector is coupled to the locking lever. Furthermore, a hysteresis can also be taken into account.

• – ein Gehäuse mit einer Öffnung zum Einführen eines Hakens, welcher von der Tür des Geräts gehalten wird;
• – einen Nocken, welcher relativ zum Gehäuse um eine Rotationsachse zwischen einer Halteposition und einer Freigabeposition drehbar ist, wobei in der Halteposition der Nocken so angepasst ist, dass er den Haken in der Position einer geschlossen Tür verriegelt,
• – einen Positionsanzeiger, welcher mit dem Nocken zusammenwirkt und zwischen einer entriegelten Position und einer Verschlussposition beweglich ist, wobei in der entriegelten Position der Nocken sich frei um die Rotationsachse drehen kann, und wobei in der Verschlussposition der Positionsanzeiger den Nocken in der Halteposition verriegelt,
• – einen elektromagnetischen Aktor, welcher einen Verriegelungsstift aufweist, welcher ausgelegt ist, den Schieber in der Verschlussposition zu verriegeln, und
• – einen Türerfassungsstift, welcher mit einem Türerfassungsschieber zusammenwirkt, welcher relativ zum Gehäuse zwischen einer Position einer offenen Tür und einer Position einer geschlossenen Tür beweglich ist.

The WO 2013/181 289 discloses a door lock for household appliances, comprising:

• A housing having an opening for inserting a hook, which is held by the door of the device;
• A cam which is rotatable relative to the housing about an axis of rotation between a holding position and a release position, wherein in the stop position the cam is adapted to lock the hook in the position of a closed door,
• A position indicator which cooperates with the cam and is movable between an unlocked position and a locking position, wherein in the unlocked position the cam is free to rotate about the axis of rotation and in the locking position the position indicator locks the cam in the stop position,
• An electromagnetic actuator having a locking pin which is designed to lock the slider in the closed position, and
• A door detection pin which cooperates with a door detection slide which is movable relative to the housing between an open door position and a closed door position.

A similar solution is also in the document WO 2013/011 528 described.

In the known solutions, the detection of the open / closed state of the door takes place at a constant position of the door. Recently, device manufacturers have required the ability to detect in a differentiated manner the open / closed state of the door during door closing and opening. In particular, it is required that the state of the open door be detected during the opening of the door with a certain hysteresis, compared to the closed state of the door during the closing of the door.

Aim and summary of the invention

The object of the present invention is to provide a device door lock which can provide the door detection hysteresis function with a simple structure and with a reduced number of components.

According to the present invention, this object is achieved by a door lock having the features which form the subject of claim 1.

The claims form an integral part of the teachings given in connection with the invention.

Brief description of the drawings

The present invention will now be described in detail with reference to the accompanying drawings, given only as a non-limiting example, in which

1 is an exploded perspective view of some components of the door lock according to the present invention, and

2 to 8th perspective views of the arrow II in 1 specified portion showing the order of operation of the door detection device.

Detailed description

Regarding 1 denotes the number 10 a door lock for household appliances according to the present invention. The door lock 10 has a housing 12 with an opening 14 for introducing a hook (not shown) which is held by the door of the device.

The door lock has a cam 16 on, which relative to the housing 12 is rotatable about a first axis of rotation A between a holding position and a release position. The cam 16 has an engaging part 18 , which interacts with the hook of the door. The cam 16 is a feather assigned (not shown). The spring has a bi-stable function. When the door of the device is in the open position, the spring pushes the cam into the release position. When the door of the unit is closed, the spring pushes the cam to the stop position.

If the hook in the opening of the door 14 as a result of closing the door enters, enters the engagement part 18 of the cam 16 engaged with the hook and the cam 16 turns about the axis A from the release position to the stop position.

The door lock 10 has a slider 20 on, which relative to the housing 12 is rotatable about a second axis of rotation B, which is oriented at 90 ° with respect to the first axis of rotation A. The slider 20 is rotatable about the second axis B between a lock position and an unlock position. A feather 22 pushes the slider 20 elastic towards the closed position. The slider 20 has a first locking part 24 and a second locking part 26 which are arranged on opposite sides with respect to the second rotation axis B. The first locking part 24 should the cam 16 Contact the cam 16 to lock in the holding position.

The second locking part 26 of the slider 20 is designed so that it has a locking pin 28 contacted. The locking pin 28 is movable in a straight line direction C parallel to the second rotation axis B, and is movable between a release position and a lock position. When the locking pin 28 with the second locking part 26 of the slider 20 engaged is the slider 20 locked in the locked position. The locking pin 28 is by an electromagnetic actuator (not shown) in the in WO 2013/181 289 controlled manner described.

The door lock 10 has a door detection device 30 which is designed to detect the open / closed state of the door. The door detection device 30 has a door detection pin 32 on, a hysteresis element 34 and an elastic element 36 , The door detection pin 32 is movable in the direction indicated by the double arrow D between a position of the open door and a position of the closed door. The door detection pin 32 acts with a door detection circuit (not shown), which in the WO 2013/181 289 is described, together. The door detection pin 32 is elastically pressed into contact with the hysteresis element.

The hysteresis element 34 gets off the slider 20 worn and is relative to the slider 20 along a direction F perpendicular to the direction D, along which the door detection pin 32 is movable, movable. The hysteresis element 34 is relative to the slider 20 movable between a first and a second position. The elastic element 36 , which may for example consist of a helical compression spring is between the hysteresis element 34 and the slider 20 inserted and pushes the hysteresis element 34 elastic towards the first position. The slider 20 has a seat 38 in which the hysteresis element 34 slidably along a direction F is performed.

Regarding 2 to 8th has the hysteresis element 34 a flat surface 40 a sloping ramp 42 which are on the flat surface 40 ends, and one step 44 between the flat surface 40 and the inclined ramp 42 ,

The operation of the door lock 10 according to the present invention will now be described with reference to 2 to 8th described.

2 shows the door lock 10 in the configuration in which the appliance door is open. In this configuration, the cam is 16 in the release position and the slide 20 is in the unlocked position. The cam 16 can rotate freely about the first rotation axis A. The hysteresis element 34 is by the spring 36 pushed to the first position. The locking pin 28 is in the unlocked position and the door detection pin 32 is with the flat surface 40 of the hysteresis element 40 arranged in contact and in the position of the open door. The door detection circuit connecting the door detection pin 32 is assigned is open.

3 shows the position of the door lock 10 while closing the door. The door hook is with the engaging part 18 of the cam 16 engaged and turns the cam 16 about the axis A in the direction indicated by the arrow G direction. The slider 20 rotates about the second axis of rotation B under the force of the spring 22 in the direction indicated by the arrow H. The feather 36 Holds the hysteresis element 34 in the first position. The door detection pin 32 stays with the flat surface 40 of the hysteresis element 34 in contact and the door detection circuit remains open.

4 shows the position of the door lock 10 in the position with the door closed. The cam 16 is in the stop position. The slider 20 is in the closed position. In this position, the door detection pin arrives 32 over the step 44 of the hysteresis element 34 and moves immediately from the open door position to the door closed position in the direction indicated by the arrow K. The door detection pin 32 is with the lower part of the inclined ramp 42 of the hysteresis element 34 in contact. The movement of the door detection pin 32 in direction K closes the door detection circuit. At this point, the electromagnetic actuator connecting the door detection pin 32 controls are activated.

As in 5 shown, the electromagnetic actuator moves the locking pin 28 in the direction indicated by the arrow L. The locking pin 28 moves to the locked position, in which it is with the second locking part 26 of the slider 20 is engaged. The slider 20 is therefore locked in the closed position. The cam 16 is locked in the stop position and the hook of the door can not be disengaged with the door lock.

Regarding 6 At the end of the working cycle of the machine, the electromagnetic actuator moves the locking pin 28 towards the unlocked position, indicated by the arrow M in FIG 6 indicated direction. At this point is the slider 20 unlocked and the cam 16 can turn to the release position.

As in 7 shown, the cam rotates 16 when the door is opened to the first axis of rotation A in the direction indicated by the arrow N direction. The cam 16 rotates the slider 20 about the second rotation axis B in the direction indicated by the arrow P. While the slider 20 turns around the axis B in the direction P, the door detection pin passes 32 with the stage 44 of the element 34 engages and pushes the hysteresis element 34 towards the second position, causing the spring 36 is compressed. During the rotation of the slider 20 in direction P is the door detection pin 32 at the inclined ramp 42 at. The door detection pin 32 moves up, and when the door detection pin 32 reaches the door open position, the door detection circuit opens.

The opening of the door detection circuit takes place in an angular position of the slider 20 instead, which depends on the angular position of the slider 20 distinguishes in which the closing of the door detection circuit takes place. In this way, there is a hysteresis between the position of the slider 20 , which determines the closing of the door detection circuit, and the position of the slider 20 which determines the opening of the door detection circuit.

Regarding 8th the cam returns 16 when the door is open, return to the release position, and the slider 20 returns to the unlocked position. The door detection pin 32 gets to the flat surface 40 of the hysteresis element 34 engaged and the spring 36 leads the hysteresis element 34 back to the first position.

The present invention is susceptible of numerous variations, with reference to those described and illustrated, without departing from the scope of the invention as defined by the following claims. The slider 20 For example, it may be movable in a rectilinear direction instead of being pivotable about axis B. The hysteresis element 34 may be along a curved direction with respect to the slider 20 be movable instead of along a straight line direction.

Claims (4)

Door lock for household appliances, comprising: - a housing ( 12 ) with an opening ( 14 ) for inserting a hook which is held by a door of a household appliance; - a cam ( 16 ), which relative to the housing ( 12 ) is rotatable about a first axis (A) between a holding position and a release position, wherein in the holding position of the cam ( 16 ) is adapted to lock the hook in the position with a closed door, - a slider ( 20 ), which with the cam ( 16 ) and is movable between an unlocked position and a closed position, wherein in the closed position the slider ( 20 ) the cam ( 16 ) locked in the holding position, - a locking pin ( 28 ) which is designed to lock the slider in the locking position, and - a door detecting device ( 30 ), which has a door detection pin ( 32 ) which is movable between a position at an open door and a position at a closed door, characterized in that the slider ( 20 ) a hysteresis element ( 34 ), which relative to the slider ( 20 ) is movable between a first position and a second position and is pushed elastically to the first position, wherein the hysteresis element ( 34 ) a flat surface ( 40 ), a sloping ramp ( 42 ), which on the flat surface ( 40 ) ends, and a stage ( 44 ) between the flat surface ( 40 ) and the inclined ramp ( 42 ), whereby the door detection pin ( 32 ) in contact with the hysteresis element ( 34 ) is pushed, during the movement of the slide ( 20 ) from the unlocked position to the closed position, the hysteresis element ( 34 ) is in the first position and the door detection pin ( 32 ) on the flat surface ( 40 ) of the hysteresis element ( 34 ) and during the movement of the slide ( 20 ) from the lock position to the unlocked position of the door catch pin (FIG. 32 ) on the inclined ramp ( 42 ) and the hysteresis element ( 34 ) in the second position. Door lock according to claim 1, characterized in that the hysteresis element ( 34 relative to the slider ( 20 ) is movable along a rectilinear direction (F). Door lock according to claim 2, characterized in that the door detection pin ( 32 ) along a rectilinear direction (D) at right angles with respect to the direction of movement (F) of the hysteresis element ( 34 ) is movable. Door lock according to any one of the preceding claims, characterized in that the slide ( 20 ) relative to the housing ( 12 ) is rotatable about an axis of rotation (B), which at 90 ° to the axis of rotation (A) of the cam ( 16 ) is arranged.

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