EP1212973A1 - Door latch - Google Patents

Abstract

The door lock has the rotary components such as a closing lever (14) and the active region (22) of a gripping device (18) arranged so that the force transmitted to move from closed to open and from the open to closed positions is roughly equal. The components can be arranged so that the bearing friction and contact face friction also matches in both directions. Preferably the rotatable components are rotatable by means of a bearing and/or the contacting surfaces cooperate by means of bearings arranged between them.

Description

Field of the Invention

The present invention relates to a door lock for electrical household appliances such. B. washing machines, dishwashers and tumble dryer. In particular, the present invention a door lock for electrical Household appliances that are for full opening and Closures of an appliance door to open and close the acting forces required essentially the door lock correspond.

State of the art

A disadvantage of known door locks for household appliances is as they e.g. B. in DE 195 40 843 C2 and DE 198 37 248 C2 that are described for a complete Opening process of an appliance door (i.e. a transition of the door lock from the closed position to the open position) Forces are greater than that for closing (i.e. a transition from the open position to the closed position) required forces.

The different forces for opening and closing the Door lock result, among other things, from the fact that appliance doors of electrical household appliances usually in an open Condition, i.e. when the door lock is open, see above are biased that the appliance door and thus the door lock close automatically. If a predetermined opening angle for the appliance door and falls below Snap point for the door lock will be reached by the Door lock creates pulling forces that are sufficient to close the appliance door completely pull in without being pulled by a user Forces are to be exerted. Furthermore, usually lies in the closed position of the door lock, i.e. in the closed Condition of the appliance door, a large force in front of the appliance door lock securely. Typically these are with the Locking position present locking forces so large that a Door seal for the appliance door is compressed, for example the undesired escape of water in washing machines and dishwashers or heated air To prevent tumble drying.

When opening the appliance door, a user has to exert forces, to overcome the locking and closing forces of the door lock, until the snap point is reached.

The disadvantage here is that for the door lock acting forces results in a force-displacement function that at least for the closing and locking forces that occur during the closing process Overcoming the snap point generated by the door lock be, and the opening process by the user until When the forces to be applied are reached a hysteresis having. As described above, the door lock generated pulling and locking forces are large, is an opening the appliance door is uncomfortable for a user.

Another disadvantage is that the force-displacement function generally over the entire, usually the same length Opening and closing paths have a hysteresis. this leads to to that even for a full opening Overcoming the snap point of the door lock by a user Forces are to be exerted.

To solve this problem, it is known to use a servo motor use which is activated before the door lock is opened and by the powers he provides, those of one Opening forces to be applied by users are reduced. This constructively complex and expensive solution is prone to errors because the servo motor and components required for its operation are to be arranged together with the door lock in an appliance door. Therefore, there may be improper closing of the appliance door ("Slamming" of the appliance door) to damage. Further this approach increases the weight of the appliance door, and can due to the additional space required for larger dimensions the appliance door. Accordingly, this solution is not for Appliance doors suitable where the weight and / or the dimensions should be minimized.

Object of the invention

The object of the present invention is a door lock provide their force-displacement function for on the door lock acting forces no or at least a minimized Hysteresis for at least the sections in which to apply forces from a user during an opening operation are.

Brief description of the invention

The solution according to the invention is based on the knowledge that in door locks, as for example from DE 195 40 843 C2 and DE 198 37 248 C2 are known, the one described above undesired hysteresis of the force-displacement function avoided or at least can be minimized if the at Transitions from open positions to closed positions and vice versa Transitions (friction) forces are minimized and / or avoided. Here lies the present Invention of the approach based on (friction) forces in bearings for rotating components of door locks and / or that act between surfaces that are movable relative to each other, at least to reduce. In this way it is achieved that for a transition from a closed position to an open position required forces essentially correspond to forces, for a transition from the open position to the closed position required are.

Starting from the door lock according to DE 198 37 248 C2 the present invention a door lock with a contact area and a gripping device that has an effective area includes. The effective area is shaped so that it is in Combination with the contact area, the gripping device and thus the door lock in an open position and one Closed position holds. Furthermore, the gripping device and in particular the effective area is shaped so that the gripping device, who contacts the contact area in the open position, during a transition from the open position to the closed position loses contact with the contact area, and at one Transition from the closed position to the open position of the Contact is made (again).

According to the invention, the contact area and / or the effective area designed in such a way that those required to bring about a transition from the Forces in the closed position in the open position correspond to essential forces required for a transition the open position in the closed position are required.

As explained below, this is achieved in that those occurring between the contact area and the effective area Frictions and the resulting forces at least during a transition from the closed position to the open position be minimized. The transition from Open position in the closed position a comparable reduction occurring friction and resulting forces provided. So, in the event of a transition from the closed position friction forces occurring in the open position are reached, which essentially correspond to frictional forces which during a transition from the open position to the closed position occur.

The contact area can be rotated on a circumferential line mounted axis or on a circumference of one relative to an axis rotatably mounted bearing can be provided. The by the rotating characteristic of the axis or the bearing achieved friction minimization can be achieved through a suitable choice the surface quality of the contact area and / or the Effective range can be improved.

The desired minimization of friction can also be achieved using a by contact with the contact area rotatable device in Effective range can be reached. For this you can in the effective range one or more bearings (e.g. roller, roller bearings) attached be rotated upon contact with the contact area and thereby the friction between the corresponding Minimize areas of the effective area and the contact area.

In addition, there is a desired force-displacement function for the Door lock if the contact area and / or the gripping device during a transition from the closed position to the Open position are moved relative to each other so that the of function provided in the contact area and the effective area is lifted to maintain the closed position and thereby frictional forces occurring between the contact area and the effective range can be minimized or avoided.

An example of this is a door lock in which the Gripping device is rotatable and has a recess and in which the contact area is rotatable on a circumferential line supported axis is provided. Is in the closed position the axis is arranged in the recess and contacts it preferably to secure the door lock in the closed position to keep.

To open the door lock, i.e. for a transition out the closed position to the open position, the gripping device and / or the axis moves relative to one another so that the axis at least in the region of the recess from the gripping device moved away and preferably from the area of Recess is removed. This way at least the between the axle and the gripping device for transitions friction and (contact) forces acting in the closed position avoided.

It is also possible to use the axis and / or the gripping device to move so that the transition from the closed position in the open position between the contact area (Axis) and the effective area forces (significantly) reduced become. In this case there is contact between the Contact area (axis) and the effective area are provided.

It is also provided that the contact area and / or the Gripping device for a transition from the open position in the closed position are moved relative to each other so that the contact of the effective area and the contact area for the Open position is lifted.

If the gripping device is a gripping device rotatable about an axis is, can, alternatively or in addition to the previous ones solutions mentioned, one between the axis for the gripping device and this arranged bearing can be used to the to achieve the desired balance of power.

Also the use of a bearing between one axis pivotable locking lever for pivoting the gripping devices is a solution according to the invention.

Starting from DE 195 40 843 C2, the invention provides a Door lock ready with a locking lever on a frame is stored between a closed position and a Open position for the door lock can be swung back and forth is. According to the storage of the locking lever in the Frame designed so that the transition from the Forces in the closed position in the open position correspond to essential forces required for a transition the open position in the closed position are required.

For this purpose, preferably between the locking lever and the Bearings arranged in frames (e.g. roller bearings, roller bearings, ball bearings) used, for example on the pivot pin of the locking lever and / or bearing holes in the frame are attached.

Alternatively or additionally, the desired balance of power can be for transitions between the above positions for the door locking can be achieved when a pivotable on the frame stored tensioning lever is mounted accordingly. For this you can Roller, ball and roller bearings and other types of bearings between the frame and the clamping lever can be arranged, for example on the pivot pin of the tensioning lever and / or in bearing bores of the frame are attached.

In such a door lock, preferably one Handlebar that is articulated on the one hand with the locking lever and on the other hand is guided on the clamping lever, so with the Locking lever connected that at transitions from the closed position occurring in the open position and in reverse transitions Frictional forces are minimized. Such Reduction of frictional forces can be achieved by Axle journal of the handlebar and / or in the bearing holes in the locking lever Rolling bearings, ball bearings or the like can be arranged.

A further improvement can be achieved if the at the guidance of the handlebar on the clamping lever forces occurring be reduced when the door lock is actuated. in this connection can, if the guide of the handlebar on the clamping lever Crank pin of the handlebar in a groove guide of the clamping lever is provided, a ball bearing, roller bearing or the like be arranged on the crank pin of the handlebar.

Brief description of the figures

Fig. 1a

eine schematische Darstellung einer Ausführungsform einer erfindungsgemäßen Türverriegelung in der Offenstellung,

Fig. 1b

eine schematische Darstellung der Ausführungsform von Fig. 1a in der Schließstellung,

Fig. 2a

eine grafische Darstellung einer Kraft-Weg-Funktion einer Türverriegelung gemäß dem Stand der Technik,

Fig. 2b

eine grafische Darstellung einer Kraft-Weg-Funktion der erfindungsgemäßen Türverriegelung aus Fig. 1a und 1b,

Fig. 3a

eine schematische Darstellung der Ausführungsform der erfindungsgemäßen Greifeinrichtung von Fig. 1a in der Offenstellung,

Fig. 3b

eine schematische Darstellung der Ausführungsform der erfindungsgemäßen Greifeinrichtung von Fig. 1b in der Schließstellung,

Fig. 4a, 4b bis Fig. 8a, 8b

schematische Darstellungen weiterer Ausführungsformen erfindungsgemäßer Greifeinrichtungen in der Offenstellung (a) und in der Schließstellung (b),

Fig. 9a bis 9e

schematische Darstellungen von Zuständen einer Ausführungsform einer erfindungsgemäßen verschiebbaren Greifeinrichtung,

Fig. 10a

eine schematische Darstellung einer weiteren Ausführungsform einer erfindungsgemäßen Türverriegelung in der Offenstellung,

Fig. 10b

eine schematische Darstellung der Ausführungsform von Fig. 10a in der Schließstellung, und

Fig. 11 und 12

perspektivische Ansichten der Ausführungsform von Fig. 10b.

In the following description of preferred embodiments of the invention, reference is made to the accompanying figures, in which:

Fig. 1a

1 shows a schematic representation of an embodiment of a door lock according to the invention in the open position,

Fig. 1b

1 a schematic representation of the embodiment of FIG. 1 a in the closed position,

Fig. 2a

a graphic representation of a force-displacement function of a door lock according to the prior art,

Fig. 2b

a graphical representation of a force-displacement function of the door lock according to the invention from Fig. 1a and 1b,

Fig. 3a

1 a schematic representation of the embodiment of the gripping device according to the invention from FIG. 1 a in the open position,

Fig. 3b

1b shows a schematic representation of the embodiment of the gripping device according to the invention from FIG. 1b in the closed position,

4a, 4b to 8a, 8b

schematic representations of further embodiments of gripping devices according to the invention in the open position (a) and in the closed position (b),

9a to 9e

schematic representations of states of an embodiment of a displaceable gripping device according to the invention,

Fig. 10a

1 shows a schematic illustration of a further embodiment of a door lock according to the invention in the open position,

Fig. 10b

a schematic representation of the embodiment of Fig. 10a in the closed position, and

11 and 12

perspective views of the embodiment of Fig. 10b.

Description of preferred embodiments

The door lock shown in Fig. 1a in an open position 1 comprises a fastening device 10 for receiving the in following described components of the door lock 1. The Fastening device 10 can be, for example, a frame Frame or housing. In the fastening device 10 a locking lever 14 pivotable about an axis 12 is arranged. A closing spring 16 is in the open position shown between the end of the closing lever opposite the axis 12 14 and the fastening device 10 so tensioned that the locking lever 14 in Fig. 1a pressed counterclockwise becomes.

A gripping device described in more detail below 18 is housed rotatably about an axis 20. The axis 20 is between the end contacting the closing spring 16 and the arranged with the axis 12 connected end of the locking lever 14. A torsion spring, not shown here, is with the gripping device 18 connected and exerts these forces in order to, as in described below, rotations of the gripping device 18 according to Fig. 1 clockwise at least to support or rotational forces to exercise in a clockwise direction on the gripping device 18.

The gripping device 18 has two in an effective area 22 Recesses 24 and 26. The effective area 22, more precisely that Recesses 24 and 26 serve to grip the gripping device 18 and thus the door lock 1 in that shown in Fig. 1a Open position and in a closed position shown in Fig. 1b to keep.

In order to provide this function of the gripping device 18, an axis 28 is arranged on the fastening device 1. The Axis 28 is attached to the fastening device by means of a suitable one 10 attached bearings (not shown) rotatable about their longitudinal axis.

The recess 24 is an eccentric indentation in the Circumferential line of the gripping device 18. The recess 24 is in Dependence of the outer circumference of the axis 28 in the area of Gripping device 18 dimensioned and shaped so that it in the open position shown in Fig. 1a due to the force effect the closing spring 16 areas of the outer peripheral surface of the Axis 28 contacted in the region of the gripping device 18. The at least partially in contact with the recess 24 The outer circumferential area of the axis 28 is hereinafter referred to as the contact area 30 designated. The recess 24 also has a Slip edge 32 on the circumferential line of the gripping device 18 runs radially inwards and here an arc describes about axis 20. The slip edge 32 serves as described below in support of the transition of the Door lock 1 from the open position to the closed position and vice versa. The slip edge 32 goes into a stop edge 33 over that here in the open position as a stop for the Axis 28 can serve. Such a stop can also be caused by an external stop will be provided that is not on the Gripping device 18, but executed separately from this and e.g. is arranged on the fastening device 10.

Around the door lock 1 from the open position shown in Fig. 1a to bring into the closed position shown in Fig. 1b, is the gripping device 18 according to these figures against the Turned clockwise. The gripping device 18 slips with the sliding edge 32 along the axis 28 until the axis 28 reaches the radially outer end of the sliding edge 32. A further rotation of the gripping device 18 causes the Axis 28 to a transition area designed here as a corner 34 passes between the recesses 24 and 26. This transition area, i.e. here the corner 34, serves as a snap point, the causes the closing spring 16 to relax, thereby the locking lever 14 rotates about the axis 12. It slips the gripping device 18 with a sliding edge 36 of the recess 26 along that located in the area of the gripping device 18 Outer circumference of the axis 28 until this is a stop edge 38 of the recess 26 reached. The sliding edge 36 runs at an angle of a tangent to the circumference of the Gripping device 18 radially inward, and goes into the Stop edge 38 over, which extends to the circumference of the Gripping device 18 extends. Around the sliding edge 36 and / or to press the stop edge 38 against the axis 28, the aforementioned torsion spring, not shown here, for the gripping device 18 can be used. The door lock is now in place 1 in the closed position shown in Fig. 1b.

To the previously described transition from the open position in To effect the closed position, the gripping device 18 a gripping trap 40. The gripping trap 40 is eccentric Indentation formed in the scope of the gripping device 18. The Opening of the grip latch 40 shows in the open position (FIG. 1a) in a direction in which they have a locking block or locking hook 42 can accommodate a door, not shown, the to be locked by means of the door lock 1. To close the appliance door and thus the door lock 1 is the Locking block 42 (for example by one in the fastening device 10 correspondingly arranged, not designated Opening) into the receiving area of the gripping trap 40, where he presses on a contact surface 44 and the gripping device 18th 1a rotates counterclockwise. Because of the the locking block 42 (and possibly due to the optional torsion spring) caused rotation of the gripping device 18 results the above-described operation of the gripping device 18.

When opening door lock 1, i.e. at a transition out the closed position (Fig. 1b) in the open position (Fig. 1a), the locking lever 14, for example using a Opening lever, not shown, about the axis 12 clockwise rotated, whereby the closing spring 16 is compressed becomes. The gripping device 18 slips with the sliding edge 36 along that located in the area of the gripping device 18 Circumferential surface of the axis 28 up to that as a snap point serving corner 34. Then the gripping device 18 in Turned clockwise so that the gripping device 18 behind the corner 34 with the slip edge 32 along the axis 28 until it slides in the recess according to the open position 24 is positioned. The rotation of the gripping device 18 can here by removing the locking block 42 from the Gripping latch 40, possibly together with a pushing the housing door away Seal (not shown), and / or by the above Torsion spring for the gripping device 18 can be reached.

As explained at the beginning, the force-displacement function, which the acting forces acting on the door lock 1, for a Closing (i.e. a transition from the open position to the Closed position) and a subsequent opening (i.e. one Transition from the closed position to the open position) Hysteresis. Therefore, they are in the transition from the open position forces required in the closed position less than the transition from the closed position to the open position required forces. Such a force-displacement function is exemplified in Fig. 2a, where there is a complete Closing process by functional sections I and II and complete opening process by functional sections III and IV are reproduced.

To close the door lock 1, a user applies the forces represented by section I of the illustrated function by means of the locking block 42 until the snap point provided by the corner 34, referred to here as SP _s , is reached. Then the closing spring 16 relaxes, as a result of which the door lock 1 is closed and held in the closed position. The forces occurring here are represented by the function course II.

To open the door lock 1, the user has the by Functional section III reproduced forces to to move the gripping device 18 and the closing lever 14, forces to be overcome by the closing spring 16 are. As can be clearly seen in Fig. 2a, those for the Section III of the opening process required by one Forces to be exerted by users are significantly greater than the forces that when closing in section II through the door lock be applied and as closing and locking forces Act.

This hysteresis is partly due to the fact that in the closed position of the door lock 1 a large closing force is provided to securely lock the appliance door. This closing force is usually the same dimensioned that in the closed position a seal for the Appliance door is compressed. Furthermore, the hysteresis of the Force-displacement function also caused by the appliance door is normally biased so that it starts from a predetermined one Opening angle independently, i.e. without power by a user, closes.

If, when the door lock 1 is opened, the snap point provided by the corner 34, which is denoted by SP _o in FIG. 2a, the user has to apply further forces by means of the locking block 42 in order to bring the gripping device 18 into its position required for the open position , The aforementioned torsion spring for the gripping device 18 is not sufficient for this, since the forces acting on the gripping device 18 due to contact with the axis 28 are too great. The forces to be exerted by the user during this part of the opening process are represented by the functional section IV. This also results in hysteresis for sections I and IV.

The hysteresis of the force-displacement function for sections II and III and I and IV is now avoided in that the between the gripping device 18 and the axis 28 acting friction is reduced that the forces to be applied during the transition in the closed position and in the open position essentially correspond.

As described above, the axis 28 is rotatably supported. Therefore axis 28 rotates in the transition from the open position to the closed position and when moving from the closed position in the open position by contact with the sliding edge 32, the Corner 34 and the slip edge 36.

The rotatability of the axis 28 causes the movement the gripping device 18 occurring friction in contrast to State of the art are no sliding friction. Rather, it rolls Axis 28 when the gripping device 18 moves over the contacted Areas of the recess 24, the corner 34 and the Recess 26 from. Experimental studies have shown that in this way the hysteresis of the force-displacement function described above is essentially avoided. A force-displacement function for a door lock according to the in Fig. 1a and Fig. 1b shown door lock is shown in Fig. 2b.

The sections labeled I, II, III and IV in Fig. 2b the resulting forces give the resulting function for the sections described with reference to FIG. 2a the closing and opening processes again. It is clear here can be seen that the friction reduction described a hysteresis between the gripping device 18 and the axis 28 for the force-displacement function in sections II and III in is substantially avoided.

Furthermore, the friction reduction mentioned causes, upon reaching the Schnappunktes when opening the door lock 1, which is indicated in Fig. 2b by the reference character SP _o, by the user substantially no forces must be applied to the gripping means 18 in its for to bring the open position of the door lock 1 required position. The reduction in the forces acting between the gripping device 18 and the axis 28 also leads to the torsion spring being sufficient for the gripping device 18 to bring it into its position for the open position of the door lock 1. A hysteresis is thus essentially avoided for sections I and IV.

The same result can be achieved if instead of rotatable axis 28 a non-rotatable axis is used the one in the area of the gripping device 18 on its outer circumference arranged bearing (e.g. rolling bearing). At this not shown embodiment rolls the gripping device 18 not as described above on the axis 28, but on the Warehouse.

A further optimization of the door lock 1 is achieved if between the axis 20 and the gripping device 18 and / or between the axis 12 and the locking lever 14 in the figures Bearings not shown, such as. B. ball or roller bearings used become.

As explained, force-displacement functions are reduced or minimized Hysteresis reached when on the gripping device 18 acting friction forces at transitions from the open position be reduced to the closed position and vice versa. Other exemplary embodiments that lead to such Reduce frictional force are listed below 3a / b to 8a / b explained. In these For the sake of clarity, figures are only the gripping device 18 in different designs and the axis 28 or the Function of the axis 28 providing devices shown. As with FIGS. 1a and 1b, those with the addition "a" show designated the gripping device 18 in the open position, while the figures marked with the suffix "b" are the Show gripping device 18 in the closed position.

For a better understanding of the explanation of further embodiments 3 is the gripping device 18 and the axis 28 shown schematically according to the embodiment of FIG. 1.

As can be seen in FIG. 4, the recess 24 can be omitted be, so that the effective area 22 essentially by the Recess 26, the corner 34 and that adjacent to the corner 34 Circumferential line of the gripping device 18 is formed.

Instead of the axis 28, as shown in FIGS. 5 and 6, a stop body connected to the fastening device 10 44 can be used. The stop body 44 has a first Stop surface 46 and a second stop surface 48, the include the contact area 30. The first stop surface 46 works, as described above, in the open position and with one Transition from the open position to the closed position with the Recess 24 and the corner 34 together. It works accordingly second stop surface 48 with corner 34 and recess 26 in the closed position and during a transition from the closed position in the open position together. As with use the axis 28, the recess 24 can also be omitted here be (see Fig. 6).

The reduction in friction described above is included in this Cases achieved in that the first stop surface 46th and / or the second stop surface 48 and / or the recess 24 and / or the corner 34 and / or the recess 26 each one Have surface quality, each for itself considered or when interacting with a corresponding ensure a suitable friction reduction on another surface. Such a surface texture of individual, Several or all of the surfaces mentioned can, for example achieved by a suitable coating with materials be the friction forces that occur Reduce movements of the gripping device 18. An additional Improvement is achieved when the transition between first stop surface 46 and second stop surface 48 and / or the corner 34 are rounded.

In the embodiments shown in FIGS. 7 and 8 the stop body 44 or an axis not used, the gripping device 18 in the area of the corner 34 a rotatable axis has a (rolling) bearing or the like. Such a device designated by reference numeral 50 is to be arranged in the area of corner 34 so that it is at transitions from the open position to the closed position and vice versa contacted by the stop body 44 (or the axis) and is rotated so that due to the reduction in occurring Frictional forces a force-displacement function with or without minimized Hysteresis is reached.

In particular in the embodiment shown in FIG. 8 an additional reduction in friction is achieved if the Device 50 of the gripping device 18 in combination with the 1, or as described above, arranged on a non-rotatably mounted axis Bearing is used.

As described above, these are when a door lock is opened Forces usually to be applied are greater than those for Closing forces to be applied. Another solution that at an opening process, i.e. a transition from the closed position in the open position, a door lock required Minimizing forces is when opening the Door locking a contact of the gripping device with a to avoid the corresponding contact area.

The solution described below, in which the gripping device 18 during a transition from the closed position to the Open position in a direction radial to its circumference is moved is more complex than the solutions described above. This additional effort can be beneficial if the Embodiments described above based on the respective Apply the friction reduction not to the extent necessary provide and / or if based on the respective application the additional effort (e.g. for security reasons, the Comfort etc.) is justified.

9a to 9e, the operating states (positions) of the Gripping device 18 for a transition from the open position in the closed position and back to the open position schematically shown. For the sake of simplicity, the following Description of the stop body 44 and the gripping device 18 based on recess 24.

Starting from Fig. 9a, which shows the open position, how described above, the gripping device 18 in the in Fig. 9b shown closed position brought. In this is the stop body 44 in the recess 26 and locked by Contact with the stop edge 38 and / or with the slip edge 36 the door lock, not shown in FIG. 9.

To open the door lock, i.e. from the closed position to open position, as described above, the closing lever 14 is rotated about the axis 12. The Gripping device 18 in a direction radial to its circumferential line (i.e. in a direction perpendicular to the longitudinal axis of the Axis 20) moves. Such a direction of movement of the gripping device 18 is indicated by the arrow P in FIG. 9c. alternative according to the vertically downward movement Fig. 9c it is provided that for opening the door lock 1st the gripping device 18 is also moved in other directions, as long as the effect described below is achieved. For example, the gripping device 18 can be straight and / or not rectilinear in directions with vertical and / or horizontal motion components are moved.

As seen in Fig. 9c, the movement of the gripping device 18 whose spatial position relative to the stop body 44 changed so that the desired in the closed position Interaction between the stop body 44 and the recess 26 is not maintained. Rather, it allows spatial change in position of the gripping device 18, as above described, a clockwise rotation for the open position. This is shown schematically in Fig. 9d.

During the rotation of the gripping device 18 or after completion the rotational movement when the gripping trap 40 is a distance from the Closing block 42 permits, the gripping device 18 again in their starting position, which they assume in the open position, moved back. The state of the door lock shown in Fig. 9e 1 corresponds to that shown in Fig. 9a Open position.

These movements of the gripping device 18 when opening the Locking device 1 causes that during a transition the gripping device from the closed position to the open position 18 the stop body 44 (or comparable devices) not contacted so that due to the nonexistent Friction the forces to be applied to open the door lock 1 can be reduced. This reduction avoids force-displacement functions with hysteresis. Depending on the respective application this embodiment, more precisely that in connection with Device door used in this embodiment can be on this Thus, the forces to be applied for opening are reduced that they are smaller than those to be closed Powers are.

To the gripping device 18 in the manner described above move, for example, a type of link circuit used be used to guide the axis 20 relative to the Lock lever 14 is used. The axis 20 is also provided arranged in a longitudinal direction of the locking lever 14 Lead slot and the movements of the gripping device 18th to generate by spring elements, depending on the respective Position of the door lock 1 forces on the gripping device 18 and / or exercise the axis 20.

The door lock shown in FIGS. 10 to 12 has a frame 100, in which two parallel side walls 102 are provided for the storage of various axle journals.

A locking lever 104 is designed as a two-armed lever and has a control arm 106 and one in the control arm 106 trap arm 108 pointing approximately in the opposite direction. One end of the trap arm 108 is in the form of a trap with a Locking lug 110 and a locking lug 112 are fork-shaped.

The link arm 106 of the locking lever 104 consists of two parallel, partial arms designed in mirror image, which by the Latch arm 108 are interconnected so that an open, U-shaped frame is formed.

Two axle pins 114 of the locking lever 104 each engage in one a bearing bore of the side walls 102, not shown in the figures and ensure that the locking lever 104 is pivoted about an (imaginary) pivot axis 116.

A handlebar 118 is designed as a U-shaped crank. He points two side journals 120, two cylindrical rolling surfaces 122, a crank pin 124 and two side cheeks 126 on, each one end of the crank pin 124, each with an axle pin 120 connect. Each connected to the journal 120 The ends of the crank pins are rounded and form the Rolling surfaces 122. The axle journals 120 each engage in a bearing bore near one end of each of the arm arms 106 and are pivoted there. A (thought and concerned with a pivoting of the locking lever 104 shifting) Pivot axis 128 of the handlebar 118 runs through both axle journals 120th

A tension lever 130 has a hollow tubular guide arm 132 with a cross section in the form of a square with rounded Corners on. Along the guide arm 132 is on both sides a projection is formed, each with a sliding surface 134 for the Rolling surfaces 122 forms. A pivot axis 136 removed End 138 of guide arm 132 has a groove guide 140, that of two in one side surface of the guide arm 132 arranged, approximately perpendicular to the pivot axis 136 Recesses is formed. The crank pin 124 of the Handlebar 118 engages in the groove guide 140 and can perform both a rotary and a longitudinal movement.

A spring 142 designed as a compression coil spring is shown in FIG tubular interior of the guide arm 132 between one end 144 and the crank pin 124 of the handlebar 118 tensioned.

The end 142 of the guide arm 132 goes into an operating arm 146 of the clamping lever 130, one at each of the lateral ends Axle journal 148 is arranged. The axle journals 148 each engage a bearing bore, not shown here, on the side walls 12 of the frame 10 and are rotatably supported there.

The actuating arm 146 of the clamping lever 130 engages with sliding surfaces 150 each in a recess 152 of an actuating device 154, which by means of two axle journals 156 in one bearing bore each engages on the side walls 12 of the frame 10.

A lock fitting 158 of an electrical household appliance has a locking pin 160 which in the through the locking lug 110 and engage the latch 112 formed case capable of locking the door.

11 and 12 are in the perspective views the locking lever 104, the handlebar 118 and the tensioning lever 130 in the locked position of the closure according to FIG. 10b shown. Fig. 12 shows a view approximately in the direction of arrow A in Fig. 10b, while Fig. 13 is a view approximately in the direction of arrow B.

To explain how this door lock works referred here to DE 195 40 843 C2.

To be comparable to the door lock described above To achieve balance of power, in which there is one Transition from the closed position to the open position required Forces and for a transition from the open position forces required in the closed position essentially correspond between the axle 114 of the locking lever 104 and the corresponding bearing holes in the side walls 102 roller bearings, roller bearings or the like arranged. alternative or in addition between the axle 148 of the Clamping lever 130 and the corresponding bearing holes in the Side walls 12 such bearings used. An additional Optimization is achieved when the side journals 120 of the handlebar 118 in the bearing bores of the partial arms of the handlebar arm 106 are pivotally arranged by means of bearings.

Since the crank pin 124 of the link 118 in the groove guide 140 of the clamping lever 130 also perform rotary movements there Frictional forces occurring when reduced on the crank pin 124 bearings of suitable types are attached. Also the Use of bearings between the actuator journal 156 154 and corresponding bearing holes of the Frame 100 represents an optimization.

Claims (20)

Door lock for electrical household appliances, such as washing machines, dishwashers and tumble dryers, with: rotatable components and / or contacting surfaces that can be moved relative to one another, which interact during transitions from a closed position for the door lock to an open position for the door lock and from the open position to the closed position, characterized in that the rotatable components are rotatable and / or the contacting surfaces which are movable relative to one another are designed in such a way that forces required for a transition from the closed position to the open position essentially correspond to forces which are required for a transition from the open position to the closed position , Door lock according to claim 1, characterized in that
the rotatable components are so rotatable and / or the mutually movable contacting surfaces are designed so that forces acting in bearings for the rotatable components and / or between the relatively movable contacting surfaces during transitions from the closed position to the open position essentially Correspond to forces that act during a transition from the open position to the closed position. Door lock according to claim 1 or 2, characterized in that
the rotatable components are rotatable by means of a bearing and / or the contacting surfaces which are movable relative to one another interact by means of bearings arranged between them. Door lock for electrical household appliances, such as washing machines, dishwashers and tumble dryers, with: a contact area (30), and a gripping device (18) with an effective area (22) which is in contact with the contact area (30) in an open position of the door lock and cooperates with the contact area (30) in a closed position of the door lock to maintain the closed position, characterized in that the contact area (30) and / or the effective area (22) are designed in such a way that forces required for a transition from the closed position to the open position essentially correspond to forces which are required for a transition from the open position to the closed position. Door lock according to claim 4, characterized in that
the contact area (30) and / or the effective area (22) are designed in such a way that forces occurring between the contact area (30) and the effective area (22) during a transition from the closed position into the open position essentially correspond to forces which occur during a transition occur from the open position to the closed position. Door lock according to one of claims 4 to 5, characterized in that
the contact region (30) is provided on a circumferential line of a rotatably mounted axis (28) or on a circumferential line of a bearing rotatable relative to an axis. Door lock according to one of claims 4 to 6, characterized in that
the effective area (22) has at least one bearing which contacts the contact area (30) at least during a transition from the closed position to the open position. Door lock according to one of claims 4 to 7, characterized in that
the gripping device (18) can be rotated by means of a bearing and / or can be moved by means of a closing lever (14) which can be rotated about an axis (12) by means of a bearing. Door lock according to one of claims 4 to 8, characterized in that
the contact area (30) and / or the gripping device (18) for a transition from the closed position into the open position can be moved relative to one another in such a way that the interaction of the effective area (22) and the contact area (30) is eliminated. Door lock according to claim 9, characterized in that
the contact area (30) and / or the gripping device (18) for a transition from the open position to the closed position can be moved relative to one another in such a way that the contact between the effective area (22) and the contact area (30) is eliminated. Door lock for electrical household appliances, such as washing machines, dishwashers and tumble dryers, with: a frame (100), and a locking lever (104) mounted on the frame (100), which can be moved back and forth between a closed position and an open position for the door lock, characterized in that the locking lever (104) is mounted on the frame (100) in such a way that the forces required for a transition from the closed position to the open position essentially correspond to forces which are required for a transition from the open position to the closed position. Door lock according to claim 11, characterized in that
the mounting of the closing lever (104) is designed such that forces occurring between the closing lever (104) and the frame (100) during a transition from the closed position to the open position essentially correspond to forces which occur during a transition from the open position to the closed position occur. Door lock according to claim 11 or 12, characterized in that
the locking lever (104) is mounted on the frame (100) by means of a bearing. Door lock for electrical household appliances, such as washing machines, dishwashers and tumble dryers, with: a frame (100), and a tensioning lever (130) mounted on the frame (100), which can be moved back and forth between a closed position and an open position for the door locking, characterized in that the tensioning lever (130) is mounted on the frame (100) in such a way that the forces required for a transition from the closed position to the open position essentially correspond to the forces required for a transition from the open position to the closed position. Door lock according to claim 14, characterized in that
the tensioning lever (130) is mounted on the frame (100) in such a way that forces occurring between the tensioning lever (130) and the frame (100) during a transition from the closed position into the open position essentially correspond to forces which arise during a transition from the Open position occur in the closed position. Door lock according to claim 14 or 15, characterized in that
the tensioning lever (130) is mounted on the frame (100) by means of a bearing. Door lock according to one of claims 11 to 16,
characterized in that
a link arm (106), which is articulated on the one hand with the locking lever (104) and on the other hand on the tensioning lever (130), is connected to the locking lever (104) in such a way that forces occurring between the Handlebar arm (106) and the locking lever (104) essentially correspond to forces that occur during a transition from the open position to the closed position. Door lock according to claim 17, characterized in that
the handlebar (106) is connected to the locking lever (104) by means of a bearing. Door lock according to one of claims 11 to 18,
characterized in that
the guide for the handlebar arm (106) on the tensioning lever (130) is designed in such a way that forces occurring between the handlebar arm (106) and the tensioning lever (130) during a transition from the closed position into the open position essentially correspond to forces that occur at a Transition from the open position to the closed position occur. Door lock according to claim 19, wherein
the link arm (106) has crank pins (124) which are guided in a groove guide (140) of the tensioning lever (130),
characterized in that
bearings are arranged on the crank pin (124).

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