Patent Grant
11889965
This application claims priority to German Patent Application 10 2021 104 747.1, filed on Feb. 26, 2021, the contents of which are incorporated by reference herein.
The invention relates generally to domestic electrical appliances which have a door for selectively closing and freeing access to a process chamber formed inside a main body of the domestic appliance. Specifically, the invention relates to those domestic appliances which are equipped with a door latch which allows the closed door to be held closed and which are designed with suitable means for overcoming the holding-closed action of the door latch and allowing the door to be opened at least slightly without the involvement of a user.
In washing machines and dishwashers for domestic use, there is a growing need for solutions to automatically open the door of the machine slightly on completion of a cleaning program in order that heat or/and moisture can escape from the interior of the machine. In dishwashers, this assists with the desired drying of the dishes, which are still wet at the end of the cleaning program, and allows the energy outlay required for actively drying the dishes to be reduced. Within the context of general efforts to lower the energy consumption of domestic electrical appliances, the drying phase at the end of a program run of a dishwasher has emerged as a source of possible relevant savings. However, adequate cooling and ventilation of the dishwashing chamber of the dishwasher can only be ensured if the door is opened by more than only a gap of a few millimeters. Generally, an opening gap of several centimeters is required at least in the region of the top edge of the door (assuming that the door—as is conventional in domestic dishwashers—is pivotably mounted in the region of its bottom edge on the dishwashing container of the dishwasher) in order to ensure an air exchange in a sufficient amount between the dishwashing chamber and the external environment.
Some conventional dishwashers have in the region of the door hinge, by means of which the door is mounted on the dishwashing container, one or more hinge springs which exert on the closed door a biasing force acting in the opening direction. The hinge springs are not strong enough to overcome, when the door is closed, the holding-closed action of the door latch, that is to say the action which the door latch opposes to an attempt at opening the closed door. However, if the holding-closed action is overcome in a different way (e.g. by manual intervention by the user or by means of a motor-driven pusher), the force of the hinge springs may be sufficient in such conventional dishwashers to open the door, driven by spring force, from a still largely vertical position, in which the transmission of force via the door latch is only just released, to such an extent that the air exchange required for air drying of the dishes is possible through the opening gap that has formed.
However, where dishwashers are not equipped with such hinge springs acting in the opening direction of the door, other solutions are required in order to allow the door to be opened by the required amount without the assistance of the user.
An object of the invention is to show a way in which, in a domestic electrical appliance, and in particular in a domestic dishwasher, the door can automatically be opened by a sufficiently large amount without door-opening hinge springs being a necessary requirement therefor.
In order to achieve this object, the invention provides a mechanism for a door of a domestic electrical appliance, wherein the mechanism comprises: a door latch for holding the door closed; a latch opener mechanism which, when the door is closed, is configured to be transferred from an inactive position into an active position while at least partially overcoming a holding-closed action of the door latch; an electrically controllable actuator for displacing the latch opener mechanism from the inactive position into the active position; a movably, in particular linearly movably, arranged pusher, which is separate from the latch opener mechanism and is motionally decoupled therefrom, for force transmission, in the sense of opening of the door, in a force transmission path which bypasses the door latch; and a spring drive configured to provide a spring force which acts on the pusher and which, after the holding-closed action of the door latch has been overcome, permits the door to be pushed open by the pusher.
When the door is closed, the door latch provides a resistance against an attempt at opening the door. This resistance can be referred to as the holding-closed action of the door latch. For opening the door, this resistance must be overcome. At least under normal, regular operating conditions, the spring drive is not strong enough to overcome the holding-closed action of the door latch. In order nevertheless to be able to overcome the holding-closed action of the door latch automatically, the mechanism according to the invention comprises a latch opener mechanism with an associated electrically controlled actuator. The actuator and the latch opener mechanism provide at least part of the force which, starting from the closed door, is required to overcome the holding-closed action of the door latch. By operating the actuator when the door is closed, the door latch is thus brought into a state in which the resistance provided by the door latch to opening of the door is overcome at least partially. In some embodiments, the actuator and the latch opener mechanism are intended and adapted to overcome the holding-closed action of the door latch completely. After the holding-closed action of the door latch has been overcome, further force assistance by the actuator and the latch opener mechanism is no longer required. Instead, the force of the spring drive is sufficient to push the door open sufficiently wide after the holding-closed action of the door latch has been overcome.
The door latch comprises at least one component which is arranged on the door and which, on closing of the door, comes into closing engagement with at least one component arranged on a main body of the domestic appliance. A process chamber, for example a dishwashing chamber in the case of a dishwasher, is formed in the main body; the door is typically pivotably mounted on the main body and, when it is closed, closes an access opening to the process chamber. The latch opener mechanism, when it is transferred, with the door initially closed, from the inactive position into the active position, overcomes at least part of the resistance of the door latch which a user would have to overcome if he had to open the closed door without any other technical assistance. At least partially overcoming the resistance of the door latch can include, for example, a relative displacement of the components of the door latch that are in closing engagement contrary to a closing spring force. Alternatively or in addition, at least partially overcoming the resistance of the door latch can include, for example, a joint displacement of the components of the door latch that are in closing engagement contrary to a closing spring force.
In some embodiments, the door latch comprises a pair of latch arms which, when the door is closed, grip a latch head and thereby hold the door closed, as is shown and described, for example, in DE 10 2012 016 541 A1. In such embodiments, operation of the actuator starting from the inactive position of the latch opener mechanism can lead, for example, to the latch opener mechanism driving the latch arms apart contrary to a closing spring force. Alternatively or in addition, the latch opener mechanism can, for example, push the latch head out of the grip of the latch arms transversely to the pivot plane of the latch arms. In other embodiments, the door latch comprises a pair of latch arms which, when the door is closed, are caught in a closing mouth, as is shown and described, for example, in DE 10 2011 011 662 A1. In such embodiments, operation of the actuator starting from the inactive position of the latch opener mechanism can lead, for example, to the latch opener mechanism pushing the latch arms together contrary to a closing spring force, so that removal of the latch arms from the closing mouth is at least facilitated. In yet other embodiments, the latch opener mechanism can, for example, displace a rotary gripper, which forms a gripping mouth for capturing a stirrup web which enters the gripping mouth on closing of the door (as shown and described, for example, in DE 198 37 248 A1), in rotation or/and in translation contrary to the force of one or more closing springs of the door latch. In all these examples, the actuator-driven displacement of the latch opener mechanism from the inactive position into the active position causes the holding-closed action of the door latch to be overcome at least partially. The content of the mentioned DE specifications is hereby explicitly incorporated herein in its entirety.
The latch opener mechanism can be a single-membered or multi-membered mechanism. In some embodiments, the latch opener mechanism comprises a single, movably arranged latch opener component, which can be driven by the actuator along a straight or curved path and cooperates directly with a target component in a force-transmitting manner. Examples of such a single-component configuration of the latch opener mechanism are a linear slider and a lever. In other embodiments, the latch opener mechanism is formed by a structure of a plurality of components which are movable relative to one another, wherein this structure as a whole ensures force transmission from the actuator to one or more target components. An example of a multi-part latch opener mechanism is a bent lever mechanism.
The pusher is a mechanical component via which there runs a force transmission path which allows a force transmission, past the door latch, between the door and the main body of the domestic appliance in the sense of opening of the door. In the inactive position of the latch opener mechanism and with the door closed, this force transmission path running via the pusher can still be open, for example because the pusher is still at a distance from a pressure-receiving component with which the pusher must, however, come into contact in order to be able to transmit the spring force provided by the spring drive to the pressure-receiving component and thus push the door open. However, in the inactive position of the latch opener mechanism and with the door closed, the force transmission path running via the pusher can already be closed, wherein in this state, however, as yet no or only a comparatively small force is transmitted via the pusher. Where the pusher and the spring drive are arranged on the main body of the domestic appliance, the pressure-receiving component is arranged on the door or is formed by the door. It is, however, possible to arrange the pusher and the spring drive on the door; in this case, the main body of the domestic appliance forms or comprises the pressure-receiving component.
The spring drive can have a single spring element for generating the entire drive force which is provided by the spring drive for pushing out the pusher and—consequently—for pushing open the door. Alternatively, the spring drive can comprise for this purpose a plurality of spring elements which cooperate to generate this drive force. An example of a configuration of a spring element of the spring drive is a helical spring, which is placed under compressive stress or tensile stress in order to generate at least part of the driving force of the spring drive and, on relaxing, can transmit a movement impetus directed along its helix axis to the pusher. An alternative configuration of a spring element of the spring drive is a helical spring which is placed under tension by winding about its helix axis and, on relaxing, can drive, for example, a drive pinion which is in meshing engagement with the pusher.
When the door is closed and the latch opener mechanism is inactive, the spring drive can be substantially free from tension or already under spring tension. If the spring drive is substantially free from tension when the door is closed and the latch opener mechanism is inactive, activation of the latch opener mechanism, that is to say transfer of the latch opener mechanism from the inactive position into the active position, is accompanied by an action on the spring drive by means of which at least one spring element of the spring drive is placed under spring tension. At the latest when the active position of the latch opener mechanism is reached, the spring drive then has sufficient spring tension to permit the desired pushing open of the door. If the spring drive already has a spring tension when the door is closed and the latch opener mechanism is inactive, activation of the latch opener mechanism can be accompanied by an increase in this spring tension; however, the spring tension that prevails when the door is closed and the latch opener mechanism is inactive can alternatively already be the greatest tension to which the spring drive is subject under normal, regular operating conditions of the mechanism according to the invention.
The spring force (drive force) provided by the spring drive is sufficiently great in some embodiments to move the pusher by a distance such that an opening gap of at least 3 cm or at least 4 cm or at least 5 cm or at least 6 cm is formed between the door and the main body of the domestic appliance. The actuator, on the other hand, only has to be able to transfer the latch opener mechanism from the inactive position into the active position. In some embodiments, this requires an actuation stroke of the actuator that is shorter, in particular considerably shorter, than the distance by which the pusher must be advanced by the spring drive in order to achieve the mentioned size of the opening gap of the door. The stroke required to transfer the latch opener mechanism from the inactive position into the active position can be limited in some embodiments, for example, to several millimeters to about 1 to 2 cm. Accordingly, it can be sufficient in some embodiments to use a comparatively short-stroke linear actuator, for example in the form of a wax motor. It will be appreciated that other types of actuator, for example an electric motor, for operating the latch opener mechanism are not excluded at all.
In some embodiments, the holding-closed action of the door latch is overcome in the active position of the latch opener mechanism. In other embodiments, it can be that part, in particular a large part, of the holding-closed action of the door latch has already been overcome when the latch opener mechanism reaches the active position. However, a residual part of the holding-closed action of the door latch may still be present when the latch opener mechanism reaches the active position, although this residual part is sufficiently weak to be overcome by the force of the spring drive.
In some embodiments, the mechanism according to the invention further comprises a movably arranged blocking member which is separate from the latch opener mechanism and which, in a blocking position with the door closed, is able to exert on the pusher a blocking action such that a relaxation of the spring drive that is required for pushing open the door is prevented. With the door initially closed, the blocking member moves, in dependence on a displacement of the latch opener mechanism from the inactive position in the direction towards the active position, into a release position in which the blocking action of the blocking member on the pusher is lifted. When the blocking member is in the blocking position (with the door closed), the force transmission path of the pusher can be free of force transmission. In particular, the pusher can in this situation be at a distance from a pressure-receiving component to which the pusher transmits the force of the spring drive as it pushes the door open. This allows predefined specifications for the force conditions of the door latch to be observed precisely even within the context of mass production.
In some embodiments, the blocking member can be moved back into the blocking position by closing the previously pushed-open door. This makes it possible, after the door has automatically been pushed open, to transfer the pusher into a retracted position, by subsequently closing the door manually, in which it remains as a result of blocking by the blocking member and from which it is not pushed forward again by the force of the spring drive if the door is subsequently opened again manually by the user. Each time the user wishes to place individual pieces of crockery into the dishwasher, he opens the door, optionally pulls out the crockery baskets located in the dishwashing container, places the pieces of crockery into them, pushes the crockery baskets back in and closes the door again. This operation may be repeated several times before the machine is completely full and the user starts a new program run. It is advantageous if the pusher is not moved by the spring drive from a retracted position into an advanced position each time the door is opened by hand. This can be prevented in that closing the previously pushed-open door effects a return of the blocking member into the blocking position. The blocking of the pusher by the blocking member is then maintained until the latch opener mechanism is activated again.
In some embodiments, the pusher, as a result of the door being pushed open, moves into an advanced position in which it is within reach of an operator of the domestic appliance. In the blocking position of the blocking member, on the other hand, the pusher can be fixed in a retracted position in which the pusher is out of reach of the operator. In the retracted position, the pusher is arranged, for example, so that it is sufficiently recessed that it is out of reach of the hands of the user when the user is loading or unloading the domestic appliance.
In some embodiments, the latch opener mechanism, when it is displaced with the door closed from the inactive position in the direction towards the active position, acts in a force-exerting manner on a component of the door latch. For example, where the door latch is configured with a pair of spring-biased latch arms which are movable relative to one another (as disclosed, for example, in DE 10 2012 016 541 A1 or DE 10 2011 011 662 A1), the latch opener mechanism, when activated, can act on one or on both of the latch arms. In such embodiments, the blocking member can be capable of being urged by the latch opener mechanism, in dependence on the displacement thereof from the inactive position in the direction towards the active position, from the blocking position into the release position, wherein the blocking member in the release position allows the latch opener mechanism to be displaced back into the inactive position. For example, the latch opener mechanism can have a movably arranged latch opener component having a control ramp running at an angle to the direction of movement thereof for controlling the position of the blocking member.
In other embodiments, the latch opener mechanism, when it is displaced with the door closed from the inactive position in the direction towards the active position, can act in a force-exerting manner on the pusher. In these embodiments, the latch opener mechanism works indirectly against the resistance of the door latch in that it does not act directly on a component of the door latch by physical contact but initiates opening of the door by force transmission in the force transmission path containing the pusher. The blocking member can thereby be capable of being urged from the blocking position into the release position by an exertion of force on the pusher imparted by the latch opener mechanism.
In some embodiments, the blocking member has or comprises a linearly movable slider component, in particular a slider component which is displaceable between the blocking position and the release position in a direction perpendicular to the direction of movement of the pusher. In other embodiments, the blocking member is or comprises a pivot component or a rotary component.
The blocking member can be under a spring bias which biases the blocking member into the blocking position, for example. In some embodiments, the blocking member can also be under a spring bias in the release position, which biases the blocking member against leaving the release position. Accordingly, the blocking member can be spring-biased in a monostable or bistable manner.
In some embodiments, a coupling assembly is provided between the latch opener mechanism and the spring drive in order to build up or increase a spring tension of the spring drive in dependence on a displacement of the latch opener mechanism from the inactive position in the direction towards the active position with the door closed. The coupling assembly comprises, for example, a tensioning lever which is pivotable about a lever axis and which can be coupled in terms of movement with the latch opener mechanism at a point that is relatively closer to the axis and which can act on the spring drive at a point that is relatively further away from the axis. In the region of the point that is relatively further away from the axis, the tensioning lever can be coupled in terms of movement with a support member which is arranged so as to be linearly movable in the same direction of movement as the pusher, wherein a drive spring of the spring drive is supported between the support member and the pusher. Alternatively, it is conceivable that a drive spring of the spring drive is supported directly on the tensioning lever without the interposition of a separate support member.
Some embodiments provide that the door latch comprises a closing mechanism which is arranged so as to be displaceable between a closed state and an open state and which in the closed state retains a counter-body for holding the door closed, which on closing of the door comes into closing engagement with the closing mechanism, and in the open state releases the counter-body for opening of the door. The closing mechanism can have, for example, a pair of latch arms which are arranged so as to be movable relative to one another, as disclosed in DE 10 2012 016 541 A1 or DE 10 2011 011 662 A1. In such embodiments, the counter-body—depending on the direction of the spring biasing of the latch arms (towards one another or away from one another)—can be formed by a latch head according to DE 10 2012 016 541 A1 or by a mouth body forming a closing mouth according to DE 10 2011 011 662 A1. Alternatively, the closing mechanism can comprise a rotary gripper which is able to grip with a gripping mouth a stirrup web serving as the counter-body, according to DE 198 37 248 A1. It will be appreciated that the invention is not limited to these exemplary configurations of the closing mechanism and of the counter-body and that other configurations of the door latch are possible at all times.
In some embodiments, the door latch further comprises a closing spring assembly which provides a resistance to a displacement of the closing mechanism from the closed state in the direction towards the open state. In such embodiments, the latch opener mechanism is able to urge the closing mechanism, by physical contact, from the closed state against the resistance of the closing spring assembly in the direction towards the open state. The displacement stroke of the latch opener mechanism between the inactive position and the active position is in some embodiments at least sufficient to effect a transfer of the closing mechanism from the closed state into the open state when the door is closed.
According to a further aspect, the invention provides a mechanism, which can be implemented independently of the actuator-driven latch opener mechanism, for a door of a domestic electrical appliance, comprising: a door latch for holding the door closed; a movably, in particular linearly movably, arranged pusher; a pressure receiver, wherein one of the pusher and the pressure receiver is arranged on the door and the other of the two is arranged on a main body of the domestic appliance which holds the door in a movable manner; a spring drive for providing a spring force which acts on the pusher and which, after a holding-closed action of the door latch has been overcome, permits the door to be pushed open by the pusher, wherein, for pushing open the door, the pusher is configured to transmit the spring force to the pressure receiver by physical contact in a force transmission path which bypasses the door latch, wherein the pusher and the pressure receiver are movable into a relative stand-by position in which they are free of force transmission when the door is closed.
Such a relative position of the pusher and the pressure receiver that is free of force transmission is present inter alia when there is no physical contact between the pusher and the pressure receiver, that is to say when they are arranged at a distance from one another. Freedom from force transmission can also be present when the pusher and the pressure receiver are in mutual contact but no pushing forces are transmitted between them. The state of freedom from force transmission between the pusher and the pressure receiver (when the door is closed) facilitates the observance of predefined specifications in respect of the force conditions of the door latch.
The pressure receiver is a body to which the pusher transmits the spring force of the spring drive in order to push open the door. If the pusher is arranged on the main body of the domestic appliance (e.g. in the case of a dishwasher on the dishwashing container), the pressure receiver can be formed, for example, by a lining panel which lines the door on the door inner side facing the main body.
In some embodiments, the pusher has an associated spring-loaded retraction member which, in dependence on a closing of the door and contrary to a spring action of the spring drive, is able to urge the pusher out of physical contact with the pressure receiver. The retraction member ensures that the pusher is at a distance from the pressure receiver after the door has been closed.
In some embodiments, the retraction member has a blocking function for the pusher and is arranged so as to be movable between a blocking position and a release position. The retraction member, in the blocking position with the door closed, is able to exert on the pusher a blocking action such that a relaxation of the spring drive that is required for pushing open the door is prevented. In the release position of the blocking member, on the other hand, the blocking action on the pusher is lifted. In dependence on a closing of the door, the retraction member is able to perform a movement from the release position into the blocking position, wherein, on moving from the release position into the blocking position, it is able to exert a retraction stroke on the pusher. By configuring the retraction member with such a blocking function, it can be ensured that, after the door has been closed, the physical distance between the pusher and the pressure receiver is maintained, because the retraction member moves into its blocking position in dependence on the closing of the door and in the blocking position blocks the pusher. Following operation of the pusher which has led to the door being pushed open, the pusher can be brought into a retracted position and locked in that position by manually closing the door once. Therefore, when the door is subsequently opened manually, the pusher remains in its retracted position and does not protrude in such a manner that it could cause injury into the space in which the user moves his hands, for example in order to load or unload the domestic appliance.
In other embodiments, the spring drive has a drive spring which is supported between the pusher and a movably arranged support member. The support member is coupled in terms of driving with an electrically controlled actuator by means of which the support member is movable from a relative rest position with respect to the pusher into a relative tensioning position in order to build up or increase a spring tension of the drive spring. In the relative rest position of the support member, with the door closed, the pusher and the pressure receiver are able to assume the relative stand-by position. In these embodiments, the spring drive, when the support member assumes the relative rest position and the pusher and the pressure receiver are in the relative stand-by position, can be free from tension or already under spring tension. The support member can be coupled with the actuator via a lever drive, for example. By suitably configuring the lever drive, a comparatively large movement stroke of the support member and thus a sufficient build up or increase of tension in the spring drive can be achieved with a comparatively small actuation stroke of the actuator.
According to a further aspect, the invention provides a mechanism for a door of a domestic electrical appliance, wherein the mechanism comprises: a door latch for holding the door closed, wherein the door latch comprises a pair of spring-biased latch arms which are arranged so as to be pivotable relative to one another between a closed state and an open state and which in the closed state retain a counter-body for holding the door closed, which comes into closing engagement with the latch arms on closing of the door, and in the open state release the counter-body for opening of the door; a latch opener mechanism which cooperates mechanically with the latch arms and which, when the door is closed, is configured to be transferred from an inactive position into an active position in order thereby to urge the latch arms from the closed state in the direction towards the open state; and a wax motor for driving the latch opener mechanism.
According to yet a further aspect, the invention provides a mechanism for a door of a domestic electrical appliance, comprising: a movably, in particular linearly movably, arranged pusher; a spring drive which acts on the pusher; a movably arranged blocking member which, in a blocking position with the door closed, is able to exert on the pusher a blocking action such that a relaxation of the spring drive that is required for pushing open the door is prevented; and an electrically controllable actuator for exerting a force on the pusher in order to overcome the blocking action of the blocking member on the pusher.
A further aspect of the invention provides a mechanism for a door of a domestic electrical appliance, comprising: a movably, in particular linearly movably, arranged pusher; a spring drive which acts on the pusher; a movably arranged blocking member which, in a blocking position with the door closed, is configured to exert on the pusher a blocking action such that a relaxation of the spring drive that is required for pushing open the door is prevented; a movably arranged control member, separate from the pusher, for controlling the position of the blocking member; and an electrically controllable actuator for exerting a force on the control member in order to overcome the blocking action of the blocking member on the pusher.
Finally, the invention also provides a domestic dishwasher which comprises: a dishwashing container which delimits a dishwashing chamber; a door which is mounted on the dishwashing container so as to be pivotable about a horizontal pivot axis close to the floor; and a mechanism of the type explained hereinbefore. It can be optionally provided that the door is free of the action of a hinge spring assembly which biases the closed door in the opening direction. Such a hinge spring assembly for the door can consequently be omitted; even without hinge springs with an opening action it is possible by means of the mechanism according to the invention to achieve a sufficiently large opening gap of the door without the assistance of the user.
The invention will be explained in greater detail hereinbelow with reference to the accompanying drawings, in which:
Reference will first be made to
In
The mentioned door latch is composed of two basic components which come into engagement with one another on closing of the door 22 for the purpose of holding the door 22 closed, namely a latch unit 26 and a counter-body 27. In
With the door 22 closed, when the counter-body 27 is caught in the latch unit 26, the latch unit 26 provides resistance to opening of the door 22. A user who wishes to open the door 22 by hand must overcome this resistance. To this end, the user must manually apply a certain opening force.
The dishwasher 10 additionally has an automatic door opening function which allows the door 22 to be opened at least slightly without manual intervention by the user. Because of the absence of hinge springs with an opening biasing action, it is not sufficient for the door opening function of the dishwasher 10 simply to overcome the holding-closed action of the latch unit 26, since there would then still not be a sufficiently large opening gap between the door 22 and the dishwashing container 12. Instead, the door opening function of the dishwasher 10 must be suitably configured to provide the door 22 with a certain movement impetus, by which the door 22 is pushed open by the required amount, after the holding-closed action of the latch unit 26 has been overcome.
In order to achieve the door opening function, the dishwasher 10 has an opener unit 28, indicated schematically in
It will be appreciated that the opener unit 28 can alternatively be arranged on the door 22. In this case, part of the container wall of the dishwashing container 12 serves as the pressure receiver, for example part of a front wall of the dishwashing container 12 that is situated beneath the container top 14 but above the dishwashing chamber 16. If the latch unit 26 and the opener unit 28 are both arranged on the dishwashing container 12 or are both arranged on the door 22, the two units 26, 28 can be structurally integrated in a joint latch and opener module. However, it is of course equally possible to design the latch unit 26 and the opener unit 28 as separate structural modules which are mounted separately from one another on the dishwashing container 12 or on the door 22.
The further figures show various exemplary embodiments which provide the door opening function which has been explained. For all the figures, identical components or components which have an identical action are provided with identical reference signs, wherein an appended lowercase letter shows that it is a different exemplary embodiment. Unless otherwise indicated in the description of a specific exemplary embodiment, reference is made for the explanation of such identical components or components which have an identical action to the comments made in connection with a preceding exemplary embodiment.
Reference will now be made to
Opening of the door is possible in that a user pulls the door and thereby removes the latch head 32 from being gripped by the two latch arms 36. In addition to this possibility for manual opening, the latch and opener module 30 offers an automatic opening function. To this end, the latch assembly 30 is designed with an arm ram 44 which is movable forwards and backwards in a linear direction by means of an electrically controllable actuator 46. The arm ram 44 is coupled with a piston 47 (
The arm ram 44 acts in a mechanically controlling manner on the position of a blocking slider 52, which is able to fix a pushing slider 54 in a retracted position shown in
For controlling the position of the blocking slider 52, the arm ram 44 is designed with a control ramp 56 which forms a ramp path which runs at an angle to the direction of movement of the arm ram 44 and along which the blocking slider 52 slides in the manner of a path-path follower engagement when the arm ram 44 is advanced from the inactive position into the active position. The blocking slider 52 is thereby urged to the side and consequently releases the pushing slider 54. In the exemplary embodiment shown, the blocking slider 52 is designed with a sloping surface 57 which runs at substantially the same angle to the direction of movement of the arm ram 44 as the control ramp 56. The sloping surface 57 cooperates with the control ramp 56 of the arm ram 44 in the manner of wedge surfaces which slide on one another in order to convert a movement of the arm ram 44 into a transverse movement of the blocking slider 52.
After the blocking of the pushing slider 54 has been lifted, an opener spring 58 which serves as a spring drive and in the example shown is formed by a helical compression spring can relax by expanding along its helix axis and thereby push the pushing slider 54 forwards. The pushing slider 54 thereby strikes a pressure receiver and transmits an opening force thereto, whereby the door is pushed open. Assuming that the latch and opener module 30 is arranged on the dishwashing container 12 of the dishwasher 10 of
The blocking slider 52 is under the biasing of a biasing spring 60, which biases the blocking slider 52 in the direction towards the blocking position according to
The blocking of the blocking slider 52 by the pushing slider 54 when the pushing slider 54 is in the advanced position does not prevent the arm ram 44 from being able to be moved back into its inactive position, after activation of the opening function of the latch and opener module 30 (i.e. after the door has automatically been pushed open), by operation of the actuator 46. The latch arms 36 are then no longer pushed apart by the arm ram 44 and can return to their closest possible rest position under the action of the closing spring 40. This situation is shown in
If, starting from the situation according to
Because the pushing slider 54 is urged back into its retracted position by such manual closing of the door and the blocking slider 52 as a result moves back into its blocking position, the pushing slider 54 remains blocked in its retracted position according to
Reference will now additionally be made to
Accordingly, the blocking slider 52 at the same time acts as a retraction member for the pushing slider 54. However, the retracting action of the blocking slider 52 on the pushing slider 54 is dependent on the pushing slider 54 first being moved by closing of the door into a position in which the blocking slider 52 is no longer held in the release position by the pushing slider 54. The biasing spring 60 is to be designed to be sufficiently strong that it is able, against the force of the opener spring 58, to urge the blocking slider 52 into the blocking position and thereby urge the pushing slider 54 over the last path portion into the inactive position.
In the variant according to
It will be appreciated that the number of latching depressions 66a is not limited to three, as shown in
In the exemplary embodiment of
In the exemplary embodiment of
In
When the arm ram 44c is driven, the tensioning slider 76c is moved synchronously owing to the movement coupling via the coupling lever 74c. If the arm ram 44c is driven starting from its inactive position and if the door is still closed, the tensioning slider 76c moves closer relative to the pushing slider 54c. The opener spring 58c is thereby tensioned more greatly. The spring tension building up in the opener spring 58c cannot be discharged, however, because the pushing slider 54c is prevented from jumping forwards by the still closed door. It is conceivable that, in the inactive position of the arm ram 44c, the pushing slider 54c is already in physical contact with the pressure receiver. In some embodiments, however, the pushing slider 54c is not in physical contact with the pressure receiver in the inactive position of the arm ram 44c, that is to say it is at a distance from the pressure receiver. In such embodiments, when the arm ram 44c is activated, the “packet” of the pushing slider 54c, the opener spring 58c and the tensioning slider 76c first jointly moves forwards without the blocking slider 76c moving relatively closer to the pushing slider 54c. Only when the pushing slider 54c strikes the pressure receiver can the tensioning slider 76c move relatively closer to the pushing slider 54c, because the still closed door prevents a further forward movement of the pushing slider 54c. As a result of the blocking slider 76c moving relatively closer, the two sliders 54c, 76c move from the relative rest position into a relative tensioned position.
As explained in connection with the preceding exemplary embodiments, activation of the arm ram 44c at the same time leads to at least partial forced opening of the latch arms 36c. The holding-closed action of the latch arms 36c thus becomes weaker. From a specific degree of forced opening of the latch arms 36c by the arm ram 44c, the spring tension that has built up in the opener spring 58c is sufficiently great to suddenly push the pushing slider 54c away (into the relative rest position) relative to the tensioning slider 76c and thereby push the door open. It may be that, at the time the opener spring 58c relaxes, the latch arms 36c have not been opened sufficiently far by the arm ram 44c that the latch head—not shown in
The distance of the tensioning body 76c from the lever axis 72c is greater than the distance of the arm ram 44c from the lever axis 72c. In the example shown, the tensioning body 76c is approximately more than twice as far from the lever axis 72c as the arm ram 44c. By suitably dimensioning the lever lengths of the arm ram 44c and of the tensioning body 76c, a comparatively large stroke of the tensioning body 76c can be achieved with a comparatively small stroke of the arm ram 44c. Even when a comparatively short-stroke wax motor is used as the actuator 46c, a sufficiently large stroke of the tensioning body 76c to tension the opener spring 58c sufficiently can then be achieved.
Finally, reference is made to the exemplary embodiment of
The door opener module 78d is a self-contained structural unit with a module housing 80d by means of which the door opener module 78d can be fastened to a superordinate component, for example the dishwashing container 12 of
In the deactivated state according to
In order to hold the pushing slider 54d in its retracted position, the door opener module 78d has a rotary member 84d which is rotatably mounted on the module housing 80d and is spring-biased in a bistable manner by means of a spring element 82d, which in the example shown is in the form of a leg spring. The rotary member 84d serves as the blocking member within the meaning of the present disclosure and is rotatable between a blocking rotary position shown in
The rotary member 84d has a gripping structure 86d which, in the blocking rotary position, is in gripping engagement with a suitably configured engagement structure 88d of the pushing slider 54d. The spring element 82d is sufficiently strong to fix the pushing slider 54d against leaving the retracted position in the blocking rotary position of the rotary member 84d. The force of the opener spring 58d is accordingly not sufficient to overcome the blocking action of the rotary member 84d alone, that is to say without assistance from the actuator 46d, when the rotary member 84d is in the blocking rotary position. Only when the actuator 46 is additionally operated can the blocking action of the rotary member 84d be overcome and rotation of the rotary member 84d into the release rotary position be effected. During this rotation of the rotary member 84d, the engagement between the gripping structure 86d and the engagement structure 88d is released, as is shown in
If the door is then manually closed by the user, the pressure receiver urges the pushing slider 54d from the advanced position according to
| Number | Date | Country | Kind |
|---|---|---|---|
| 102021104747.1 | Feb 2021 | DE | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20160029872 | Kim | Feb 2016 | A1 |
| Number | Date | Country |
|---|---|---|
| 107237561 | Oct 2017 | CN |
| 108661454 | Oct 2018 | CN |
| 19837248 | Feb 2000 | DE |
| 102011011662 | Aug 2012 | DE |
| 102012016541 | Feb 2014 | DE |
| 102014218238 | Oct 2015 | DE |
| 2394559 | Dec 2011 | EP |
| Entry |
|---|
| Machine translation of CN-108661454-A, dated Oct. 2018. (Year: 2018). |
| Number | Date | Country | |
|---|---|---|---|
| 20220273157 A1 | Sep 2022 | US |
