This application claims the priority, under 35 U.S.C. § 119, of European Patent Application EP 21157161.7, filed Feb. 15, 2021; the prior application is herewith incorporated by reference in its entirety.
The invention relates to a door lock having a frame configured to be fixed to a housing of a household appliance and including a latch for cooperating with a clamp attached to a door pivotably connected to the housing and for locking the door by being inserted along an insertion direction, the latch being movable in a lock plane parallel to the insertion direction and including at least one first guiding pin slidable in a linear first guide section of a guide included in the frame, the first guide section being parallel to the insertion direction and including a stop point for the first guiding pin at a distal end defined by the insertion direction, and at least one second guiding pin slidable in a curved second guide section of the guide, the second guide section curved parallel to the lock plane and outwardly from the insertion direction, and a spring device being attached between the frame and the latch and biasing the latch in the insertion direction.
Further, the invention relates to a household appliance having a housing, a door pivotable around a door axis for closing the housing, and a door locking device for locking the door including the door lock according to the invention fixed to the housing and a clamp fixed to the door for cooperating with the door lock.
U.S. Pat. No. 8,702,134 B2 discloses a door lock and a household appliance which may specifically be embodied in a laundry drying machine of the generic type as defined above. In the door lock device disclosed, the latch is carried by the door of the household appliance, and a frame fixed to the frame of the household appliance is provided with a striker device for the latch, the striker device being a pair of opposite jaws carried by the frame adjacent to each other and movable against the bias of an elastic device. The frame is provided with a guiding device for the jaws adapted to cause the jaws to be driven apart from each other in response to a traction exerted in use on the latch, the elastic device, and the guiding device are disposed so that the movement of the jaws occurs on a plane.
German Patent DE 10 2010 051 518 B4 discloses a door lock and a household appliance such as a laundry dryer including such a door lock. The door lock disclosed includes a closing spring configuration tensioned in an open position of the door lock, which relaxes when the door is closed, and a gripping unit which grips a closing element when the door is closed and releases the gripping element when the door is opened again. In an open position of the door lock, the gripping unit is in blocking engagement with a blocking element due to the force of the closing spring configuration and thus prevents relaxation of the closing spring configuration. When the door is closed, the closing element causes the gripping unit to rotate about an axis of rotation, the gripping unit coming out thereby of blocking engagement with the blocking element and enabling the closing spring configuration to be relaxed. The force of the relaxing closing spring configuration causes a subsequent closing movement of the gripping unit.
In the present context a household appliance is an appliance intended for use and operation in a private household to provide a specific and predetermined material purpose. Examples of such household appliances are laundry care machines such as laundry washers and dryers, cooling appliances such as refrigerators and freezers, cooking appliances such as ovens, microwave devices, and steamers, and dishwashers.
In many cases regulations and practice require that a door of a household appliance, while properly closing an interior wherein some treatment process such as cooling or treating laundry or dishes by water or some watery solution is being done, needs to allow the door being opened by an application of force at some appropriate amount. One reason therefor may be allowing access to the interior for adding or removing items to be processed, or ascertaining safety for a person of appropriate size who is undesirably locked into the interior.
Prior art door locks such as those referred to above are complicated in construction and manufacture, even if they provide the functions desired from them. Accordingly, there is a need for a door lock for application in a household appliance of the generic type as defined above which is simple in construction, easy to manufacture, and durable in function, and provides the required functions reliably.
It is accordingly an object of the invention to provide a door lock for a household appliance and a household appliance equipped with the door lock, which overcome the hereinafore-mentioned disadvantages of the heretofore-known door locks and appliances of this general type and in which the door lock is simple in construction, easy to manufacture, durable in function, and provides its required functions reliably.
For the purpose of accomplishing this object, the present invention provides an electrical machine of the generic type as defined in the generic part of the appended independent claim which also includes the features of the body of the independent claim.
Preferred embodiments of the invention are defined in the appended dependent claims as well as in the subsequent disclosure. Such preferred embodiments may also be applied in mutual combinations insofar as possible under technical considerations to any extent, even if not specified herein explicitly.
With the foregoing and other objects in view there is provided, in accordance with a first aspect of the invention, a door lock having a frame configured to be fixed to a housing of a household appliance and including a latch for cooperating with a clamp attached to a door pivotably connected to the housing and for locking the door by being inserted along an insertion direction, the latch being movable in a lock plane parallel to the insertion direction and including at least one first guiding pin slidable in a linear first guide section of a guide included in the frame, the first guide section being parallel to the insertion direction and including a stop point for the first guiding pin at a distal end defined by the insertion direction, and at least one second guiding pin slidable in a curved second guide section of the guide, the second guide section being curved parallel to the lock plane and outwardly from the insertion direction, and a spring device being attached between the frame and the latch and biasing the latch in the insertion direction. Further, the latch is U-shaped and includes a first tab configured for gripping the clamp by movement along the insertion direction, and a second tab configured for being pushed by the clamp by movement along the insertion direction, and the second guide section is curved by more than 90° and provides an arrest point for the second guiding pin at a petal end defined by the insertion direction.
With the objects of the invention in view, there is also provided, as a second aspect, a household appliance having a housing, a door pivotable around a door axis for closing the housing, and a door locking device for locking the door including the door lock according to the first aspect of the invention being fixed to the housing and a clamp fixed to the door for cooperating with the door lock, wherein the clamp includes an eyelet configured for cooperating with the latch in case of the door being opened by pushing the second tab for moving the second guiding pin from the arrest point, and by being gripped by the first tab for pulling the clamp along the insertion direction for the first guiding pin to reach the stop point and lock the door.
Advantages of the invention include simplicity in construction and ease of manufacture which are attained by providing only one latch instead of two striker devices, and shaping the latch in hook-fashion and the clamp cooperating with the latch in eyelet-fashion for providing a solid and reliable grip between the latch and the clamp. Simplicity of manufacture is also provided by having the latch move in a plane parallel to the direction of insertion which lends itself to a particularly compact space-saving construction. Reliability of function is also attained by providing an arrest point for the second guiding pin which defines an open position for the door lock that is stable over time.
Principally, the invention may be applied to any household appliance. In particular, the household appliance may be a laundry care machine such as a laundry washer or laundry dryer, a cooling appliance such as a refrigerator or a freezer, a cooking appliance such as an oven, a microwave device, or a steamer, and a dishwasher.
Applying the invention otherwise in a locking device of any housing with a swiveling door such as a cupboard or other piece of furniture, is not excluded.
In a preferred embodiment of the invention the second guide section is curved by between 100° and 150°. More preferred, is the second guide section being curved by about 120°.
In another preferred embodiment of the invention the second guide section is open against the insertion direction. Thereby advantage is taken from the fact that the second guiding pin being biased by the spring devices is forced against the guide's structural parts at a side limiting the guide in the insertion direction, making guiding devices in the opposite direction superfluous. Thereby the structure and construction of the frame is simplified, which may allow manufacturing the frame by injection molding with reduced further shaping effort.
In a further preferred embodiment of the invention the latch is placed adjacent to at least one inner side of the frame which is plane and parallel to the lock plane. Thereby the latch glides on an inner side as it moves, thereby even better defining its location within the door lock and improving reliability and durability of its function. It is more preferred if the latch is placed between two mutually parallel inner sides of the frame, thereby being retained in space from two opposite sides.
In an additional preferred embodiment of the invention the inner side is formed at a flat section of the frame, the guide is formed as a cut-out in the flat section, and the first guiding pin and the second guiding pin protrude through the guide and are exposed from the section at an outer side opposite to the inner side. Thereby a particularly robust guide is provided, improving retention and movement of the latch still more. It is more preferred if the spring device includes a helical spring having holders fastened to a lug fixed at the outer side and to the second guiding pin. Thereby proper function of both the latch and the spring device are ascertained. It is noted that fastening the helical spring to the second guide pin is not mandatory, since a third guide pin might be provided at the latch, and also configured to protrude through the guide for attaching the spring device. Applying the second guiding pin, however, simplifies construction and maintenance further.
In yet another preferred embodiment of the invention the first guide section and the second guide section are combined into a single structure for guiding both the first guiding pin and the second guiding pin. This also simplifies construction and manufacture. It is more preferred if the single structure is J-shaped.
In yet a further preferred embodiment of the invention, when the first guiding pin is located at or near the stop point each of the first tab and the second tab extends substantially orthogonal to the insertion direction; and when the second guiding pin is located at or near the arrest point each of the first tab and the second tab extends at an acute angle with the insertion direction, the acute angle opening backwards of the insertion direction, and the second tab being exposed by the first tab along the insertion direction. It is more preferred if the acute angle is between 45° and 60°. In such a configuration a reliable and well-defined closing of the door is provided by locating the first guiding pin properly at the stop point, and smooth interaction of the latch and the clamp is provided as the clamp is inserted in the insertion direction during closing of the door.
In yet an additional preferred embodiment of the invention the frame is enclosed by a casing fixed to the frame. Thereby the casing may serve for protecting the internals of the door lock during manufacturing, storing and forwarding to integration into a household appliance.
In still another preferred embodiment of the invention the clamp is configured for cooperating in case of the door being locked with the latch by pulling the first tab against the insertion direction by the eyelet and moving the second guiding pin to the arrest point for opening the door.
In still a further preferred embodiment of the invention the clamp is movably fixed to the door for aligning to the insertion direction upon being inserted into the door lock, thereby providing increased flexibility and reliability in closing the door by interacting the clamp with the door lock.
In still an additional preferred embodiment of the invention the door axis is orthogonal to the insertion direction. This provides an alignment between the door with the latch and the door lock which is particularly suitable for adopting the invention to opening and closing the door.
In again another preferred embodiment of the invention the household appliance including the door lock is embodied as a laundry care machine. It is more preferred if the household appliance is embodied as a laundry drying machine.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a door lock for a household appliance and a household appliance having the door lock, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
Referring now to the figures of the drawings in detail and first, particularly, to
Function and applicability of household appliance 1 are not limited presently except by its suitability to have its door 3 locked by a door lock 7 as exhibited by the figures subsequent to
According to
Latch 11 is U-shaped and includes a first tab 13 configured for gripping clamp 5 by movement along insertion direction 12, and a second tab 14 configured for being pushed by clamp 5 by movement along insertion direction 12. Second guide section 20 is curved by more than 90° and provides an arrest point 21 for second guiding pin 16 at a petal end defined by insertion direction 12.
Second guide section 20 is curved by between 100° and 150° in general, and by about 120° in particular. Thereby arrest point 21 is defined by the curvature of second guide section 20.
First guide section 18 and second guide section 20 may be concatenated or combined to a guide 17 being a single structure for guiding both a respective first guiding pin 15 and a respective second guiding pin 16, such as in
Frame 8 which represents a section of door lock 7 which is immobile with respect to housing 2 and provides fastening and guidance to the movable components of door lock 7 may be provided so as to have latch 11 placed adjacent to at least one inner side 9 of frame 8 which is plane and parallel to the lock plane, or even placed between two mutually parallel inner sides 9 of frame 8 so as to provide full lateral enclosure of latch 11 by frame 8. Inner side 9 is formed at a flat section of the frame 8, guide 17 is formed as a cut-out in the flat section. First guiding pin 15 and the second guiding pin 16 protrude through guide 17 and are exposed from the section at an outer side 10 opposite to the inner side 9.
Spring devices 22 present as a pair in door lock 7 includes a helical spring 23 having holders 24 fastened to a lug 25 fixed at outer side 10 and to second guiding pin 16, respectively. In the embodiments shown spring devices 22 include helical springs 23 which provide bias force by being expanded. Of course, it is also possible to include helical springs 23 which are to be compressed for providing bias force, or other types of springs, as alternatives.
As readily apparent from
As readily apparent from
Integrated into household appliance 1 of
Clamp 5 is also configured for cooperating in case of door 3 being locked with latch 11 as in
Clamp 5 may be movably fixed to door 3 for aligning to insertion direction 12 upon being inserted into door lock 7.
While it is preferred to connect door 3 to household appliance 1 by having door axis 4 orthogonal to insertion direction 12, this is not mandatory, but deviations to the orthogonal may be applied as appropriate in the individual case.
As shown in
Door lock 7 of
Advantages of the novel door lock 7 include simplicity in construction and ease of manufacture attained by providing only one latch 11 for engaging clamp 5, and shaping latch 11 in hook-fashion, and clamp 5 cooperating with latch 11 by eyelet 6 for providing a solid and reliable grip between latch 11 and clamp 5. Simplicity of manufacture is also provided by having latch 11 move in a plane parallel to insertion direction 12, which lends itself to a particularly compact space-saving construction. Reliability of function is also attained by providing arrest point 21 for second guiding pin 16 which defines an open position for door lock 7 that is reliably stable over time.
The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention.
Number | Date | Country | Kind |
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21157161.7 | Feb 2021 | EP | regional |