DE102009016812B4 - Door lock for a thermal cooking and/or baking device - Google Patents

Abstract

Door lock for a thermal cooking and/or baking appliance, with a door handle (24) rotatably mounted in a lockable door (2), with a locking pin (14) which has at least one locking link (16, 20) with a latching recess (17). and a locking bracket (22) designed to correspond to the locking pin (14), characterized in that the door lock is equipped with a rotary mechanism (1) whose rotary angle positions enable the door (2) to be automatically locked or opened, the locking bracket (22) is formed in two parts and has two legs (34, 35) positioned in a V-shape relative to one another.

Description

The invention relates to a door lock for a thermal cooking and/or baking appliance, with a door handle rotatably mounted in a lockable door, with a locking pin that has at least one locking link with a latching recess and a locking bracket designed to correspond to the locking pin.

Such closures are about from the EP 1 111 175 A1 known. This closure comprises a closure pin fastened to the device housing and a U-shaped spring clip forming the locking element. The latter is constructed on the shaft of a handle mounted in the door leaf in such a way that its crossbar can be deflected in a resilient manner perpendicular to the axis of rotation. In addition to this actual locking mechanism, there are additional requirements with regard to the cleaning of these devices in the case of baking ovens that can be used commercially. This is done using aggressive chemical substances, so it is important to be able to reliably lock the door during this time. Solutions known to date, for example from DE-OS 10 2006 013 519, provide separate mechanisms for this purpose, as a result of which closures of this type are comparatively complicated in construction and complex and expensive to produce.

From the EP 1 111 175 A1 a closure is known which allows opening a door with one or two pivoting movements of the handle. To simplify the lock design and increase reliability, the locking pin is fixed to the device body. In addition, a spring clip that can be moved by the handle is used as a locking element.

the DE 29 49 773 A1 deals with a locking mechanism for a pyrolytically self-cleaning oven, which automatically locks the oven door with a motor-driven locking hook sliding over a sliding surface when a predetermined operating temperature is reached in the oven.

The object of the present invention is therefore to create a closure for an appliance door that meets special requirements in terms of security against opening, e.g. B. is sufficient for certain cleaning processes.

This object is achieved in that the door lock is equipped with a rotary mechanism, the angular positions of which allow automatic locking or opening of the door, the locking bar being designed in two parts and having two legs positioned in a V-shape relative to one another.

By means of this rotary mechanism, it is now possible to hold the actual lock in the locked position and thus additionally secure it against unlocking when cleaning the device, if the door must not be opened under any circumstances. Unintentional opening of the door or one caused by a technical failure is impossible because the unlocking mechanism prevents the door from being opened thanks to the turning mechanism.

A special variant of the invention provides that a driven shaft serves as the rotary mechanism. Locking is associated with the adjustment of this shaft, preferably by rotation or components assigned to it. By rotating and/or longitudinally shifting this shaft, in interaction with the locking bar, the position mentioned can be achieved, in which the shaft blocks the locking bar.

Among other things, it is contemplated that the shaft has a connecting link arranged coaxially to the locking pin and/or supported axially by the latter. After a corresponding rotation of the shaft, this connecting link can assume the positions described, with components arranged eccentrically in the transverse direction to the axis of the shaft playing a decisive role. Depending on how the shaft is turned and what position it is in, the connecting link blocks the locking bar, releases it or even supports the opening process.

One proposal for this provides that the connecting link is formed by at least two flanks, which extend in the transverse direction to the axis of the shaft and which are aligned with one another and/or with the locking bracket in such a way that their respective position corresponds to the opening or closing angles described above . This is expediently the case when one flank is positioned in such a way that actuation of the locking bracket is prevented in the corresponding position, while the other flank is even suitable for raising the locking bracket to enable the door to be opened.

The idea is that the flanks are positioned at an angle of about 90° to one another, so that they form a kind of L with a longer and a shorter leg.

In concrete terms, the link is designed in such a way that in a first position of the link, the flanks release the locking bar, so that the door can be opened. In other words, none of the flanks blocks the locking bar in this position.

The situation is different when, in a second position of the link, a first edge of the link blocked the locking bar, preventing the door from being opened. This is e.g. B. necessary if the cooking and / or baking device according to the invention is to be subjected to a cleaning process in which toxic chemicals are used.

As already mentioned, it is also proposed that in a third position of the connecting link the second flank also raises the locking bar so that the door can be opened. The link surface lifts the locking bar out of the position that corresponds to the closed position of the door, so that the locking bar slips out of the locking position on the locking pin; the door can be opened.

An alternative solution for a rotary mechanism provides that the shaft is designed to be adjustable in the direction of its longitudinal axis between a release position and a blocking position. In this variant, the additional locking mechanism is therefore not implemented by a connecting link assigned to the shaft. Instead, the shaft is displaceable in the direction of its longitudinal axis between a release and a blocking position in relation to the locking bracket.

In this context, it is recommended that the locking pin is designed in two parts and is equipped with latching surfaces on its inside. If the locking clip has reached the position in which it rests against the latching surfaces of the locking pin, the shaft can now be adjusted in the direction of the locking clip or locking surfaces on the inside of the locking pin in order to achieve the locking position described above. The shaft does not release the locking bar from its position on the latching surfaces of the locking pin. In other words, the shaft blocks the locking bracket from slipping out of the latching surfaces of the locking pin. Corresponding to the locking pin, the locking bracket has two spring-loaded parts and has a kind of V-shape, so that it can rest behind the latching surfaces of the locking pin.

In this context, it should also be understood that the shaft is designed to correspond to the latching surfaces. This applies in particular with regard to the function described, in which the shaft, in its blocking position, prevents the blocking bracket from slipping out of the position on the latching surfaces.

Various designs for the actual door lock provide that the door handle is firmly connected to the locking pin and/or the door handle to the locking bar and/or the locking bar to the shaft and/or the door to the locking bar and/or the door to the locking pin is.

In order to be able to realize particularly favorable spring properties for the locking clip, it is provided that the locking clip is designed as a leaf spring. For the variant described, in which the locking bracket is intended to snap into place on the inside of the locking pin, it is also contemplated that the locking bracket is designed in two parts, ie has two legs positioned in a V-shape relative to one another.

Further embodiments of the invention provide that the locking link is designed as a body running helically to the axis of the shaft or that the locking pin has a locking link in addition to the locking link.

The invention is characterized in particular by the fact that a particularly suitable mechanism is created, via which an automatic locking or opening of the door for a baking and/or cooking appliance can be made possible. For this purpose, a rotating mechanism in the form of a shaft is used, depending on the angular positions of which the door is blocked or opened. The shaft either has a connecting link, which is formed by flanks arranged transversely to its longitudinal axis and, depending on their positions, the opening or closing of the door is made possible or not. Or the shaft is displaceable between a release and a blocking position in the direction of its longitudinal axis, e.g. B. by rotation. The latter embodiment assumes that the locking pin is designed in two parts, so that a locking clip, also designed in two parts, can engage on the inside of the locking pin, where it is then fixed by the shaft that is displaced in the direction of the locking clip. This creates a closure for an appliance door with which a particularly sophisticated, technically uncomplicated and cost-effective safeguard for the appliance is realized, which under certain circumstances must be kept closed to avoid certain dangers, for example when cleaning or pyrolyzing ovens.

• 1 den Zustand der Kulisse eines nicht erfindungsgemäßen Türverschlusses zum Öffnen der Tür von Hand,
• 2 eine verdrehte Kulisse eines nicht erfindungsgemäßen Türverschlusses, sodass der Sperrbügel blockiert ist,
• 3 eine verdrehte Kulisse eines nicht erfindungsgemäßen Türverschlusses, sodass der Sperrbügel hinausgedrückt und die Tür zu öffnen ist,
• 4 einen zweiteiligen Sperrbügel in Funktion,
• 5 den Zustand des Öffnens der Tür von Hand bei zweiteiligem Verschlusszapfen und Sperrbügel,
• 6 die Darstellung gemäß 5 in blockierter Position,
• 7 die Darstellung gemäß 5 mit automatischem Öffnen,
• 8 die Ansicht eines Teils einer Gerätevorderwand und -tür,
• 9 eine Darstellung gemäß 8 mit einer abgewinkelten Antriebswelle,
• 10 eine 9 entsprechende Ansicht mit einer weiteren Ausführungsform eines Türverschlusses,
• 11 Vorderansichten und Draufsichten von unterschiedlich ausgelegten Sperrbügeln,
• 12 unterschiedliche Positionen einer Verschlusskulisse zum Türgriff,
• 13 eine 8 entsprechende Darstellung mit einer Variante der Verschlusskulisse und
• 14 einen Türverschluss mit zwei Verschlusszapfen.

Further details and advantages of the invention result from the following description of the associated drawings, in which a preferred exemplary embodiment with the necessary details and individual parts is shown. Schematic representations show:

• 1 the condition of the backdrop of a door lock not according to the invention for opening the door by hand,
• 2 a twisted link of a door lock not according to the invention, so that the locking bar is blocked,
• 3 a twisted link of a door lock not according to the invention, so that the locking bar is pushed out and the door can be opened,
• 4 a two-part locking bar in function,
• 5 the state of manual opening of the door with a two-part locking pin and locking bar,
• 6 the representation according to 5 in blocked position,
• 7 the representation according to 5 with automatic opening,
• 8th the view of a part of a device front wall and door,
• 9 a representation according to 8th with an angled drive shaft,
• 10 one 9 corresponding view with another embodiment of a door lock,
• 11 Front and top views of differently designed locking brackets,
• 12 different positions of a locking link to the door handle,
• 13 one 8th corresponding representation with a variant of the locking link and
• 14 a door lock with two locking pins.

In the position according to 1 the locking bracket 22 can be unlocked by turning the door handle 2 around the in 1a be brought into the position illustrated by the arrow 28 so that the door 2 can be opened. This is the described first position of link 6, in which flanks 12, 13 release locking clip 22 and switch 45 is switched. This is illustrated in 1a by the locking bracket provided with the reference number 22'. The rotating mechanism 1 is implemented in the form of the shaft 4 in such a way that it has the coaxially arranged connecting link 6 . The reference number 43 denotes the position sensor of the link position for the automatic opening of the door, and the reference number 44 denotes the position sensor of the link position for the blocked closure. The reference number 45 carries the position sensor of the connecting link support for manual operation. The motor drive 46 of the backdrop is below.

In the representation according to 2 the door 2 is shown in the closed state. This corresponds to the second position described, in which the flank 12 of the connecting link 6 blocks the locking bar 22 . The connecting link 6 is brought into a position in which the switch 44 is switched. The eccentric surface in the form of the flank 12 is brought into a position in which the locking clip 22 cannot slip out of its position even when the door handle 2 is rotated. The door 2 remains closed despite the door handle being actuated, because the edge 12 prevents the locking bracket 22 from being able to leave its position.

3 shows schematically a position of the link 6, which has been described above as the third position and in which the switch 43 is switched and the link surface in the form of the flank 13 of the link 6 lifts the locking bar 22 from the position in which it is when the door is closed located. The locking bar 22 slips out of the locking pin 14 here; the door can be opened.

Shows another locking bar 4 . The locking clip 22 is formed there by two legs 34, 35 which are prestressed towards one another and are arranged in a V-shape towards one another. The functional reliability can thus be increased and the force load on the carrier of the locking bracket 22 and the prestressing force of the locking bracket 22 can be reduced.

Also in the representation according to 5 , 6 and 7 the locking bracket is designed in two parts and consists of the two legs 34 and 35 and the spreader 49 provided between them. The same applies here to the locking pin consisting of the two parts 47 and 48. The representation according to 5 corresponds in turn to the possibility of opening the door by hand, in that the locking bracket 22 with the legs 34, 35 can leave the position on the inside 30 of the locking pin 14, more precisely on the latching surfaces 16, 20, without this being due to training or position of the rotary mechanism 1 in the form of the drive shaft 4 could or should be prevented.

Different then in the representation according to 6 . The shaft 4 as the rotary mechanism 1 is pushed forward in the direction of its longitudinal axis 29 and blocks the locking bar 22 in such a way that it cannot leave its position on the latching surfaces 16, 20 on the inside 30 of the locking pin 14 with its legs 34, 35. The latter is formed by two parts 47 and 48 which, illustrated by 6a , are one above the other and thus block the door from opening in conjunction with the spring locking brackets 22 . The spring spreader between the two legs 34, 35 is also designated by the reference number 49.

A possible automatic opening is in 7 shown. The two parts 47 and 48 of the locking pin 14 are like 7 illustrate light, shifted from each other and thus give the locking bar 22 free.

In 8th a closure structure is shown in which a non-rotatable bearing holder 7 is fastened to the front wall 3 of the device, which is otherwise not shown in detail. The drive shaft 4 and the locking pin 14 firmly connected to the drive shaft 4 are rotatably guided by the bearing 8 in the bearing holder 7 . The drive shaft 4 is driven by a drive motor 11 . A clutch 10 and a positioning device 9 are provided between the drive shaft 4 and the motor 11 . Using the latter, the values of the opening angles can be set via the position switches 38, 39, 40. The clutch 10 protects the drive motor from overload; in the event of a fault, door 2 can be opened with a suitable tool via a flat area. A variant in the form of a two-stage closure has two links that are offset in the axial direction, namely a locking link 15 and a locking link 16 . The locking link 15 keeps the door 2 open by a gap via the locking bracket 22 . The door 2 is drawn against the door seal by the locking link 16 .

In 9 a comparable structure is shown, but with the difference that the drive shaft 4 is angled between the clutch 10 and the drive motor 11 . The torque of the drive motor 11 is transmitted to the drive shaft 4 via a bevel gear 36 .

This differs from the representation in 10 in that the locking pin 14 is connected to the rotatable door handle 24 and the locking bar 2 is connected to the drive shaft 4 .

In 11 are different versions of a locking bar 2 play. In the representation according to 11a is indicated by the diameter of a small circle of the diameter of the locking recess 17, while the diameter of the large circle corresponds to the outer diameter of the slides 15, 16 and 20. In 11a the locking bar 22 has a curved front part, which is better guided by the round contour of the locking recess 17 (small circle). In the variant in 11b an angled front part of the locking bar 22 is better guided by the locking pin 14 than in the straight variant in 11c .

In 12 various positions of the locking link 16 with respect to the door handle 24 are shown with the corresponding position of the locking bracket 22 . In 12a is the door slammed or closed, in 12d the door is opened by turning the door handle 24. In 12c is the door locked and in 12d it will open automatically without turning the door handle 24. In the representation according to 12a if the door handle 24 is in its vertical starting position, the locking link 16 of the locking pin 14 is in a position corresponding to the angle y1. The door is closed (slammed) and held in this position. In the schematic representation of 12b the door handle 24 is turned as far as it will go, this position corresponding to the angle x1. The locking link has the position corresponding to the angle y1 compared to the angular position in 12a not changed. The locking bar is released. In the representation according to 12c the locking link 16 of the locking pin 14 was brought into the position corresponding to the angle y2. When turning the door handle 24, the locking bar 21 remains in the locking recess 17 of the locking link 16, which means that the door cannot be opened. According to 12d the door handle 24 is in the vertical starting position. The locking link 16 of the locking pin 14 is in a position corresponding to the angle γ3. The locking clip 22 is free and slips out of the locking recess 17. In this case, the door 2 is opened automatically without the door handle 24 having to be turned.

In 13 the locking link 20 is a helical body at a certain angle to the axis of rotation of the drive shaft 4 . As a result, after the door 2 has been closed by turning the locking pin 14 , the locking bar 21 is drawn in with respect to the front wall 3 of the device and the inclined section of the locking link 20 .

Finally shows 14 two locking pins 14 with mirror-inverted corresponding helical links 20. Tangential forces caused by sliding or slipping of the locking bracket 21 on the helical surface deteriorate the hold of the locking bracket 21 in the locking recess 17. The shackle is held in the locking recess 17 by the helical body of the upper locking pin 14 . The locking function and the automatic opening of the door are retained.

Claims (20)

Door lock for a thermal cooking and/or baking appliance, with a door handle (24) rotatably mounted in a lockable door (2), with a locking pin (14) which has at least one locking link (16, 20) with a latching recess (17). and a locking bracket (22) designed to correspond to the locking pin (14), characterized in that the door lock is equipped with a rotary mechanism (1) whose rotary angle positions allow the door (2) to be locked or opened automatically, the locking bracket (22) being constructed in two parts and having two legs (34, 35) positioned in a V-shape relative to one another. door lock after claim 1 , characterized in that a driven shaft (4) serves as the rotary mechanism (1). door lock after claim 2 , characterized in that the shaft (4) has a link (6) arranged coaxially with the locking pin (14) and/or supported axially by the latter. door lock after claim 3 , characterized in that the connecting link (6) is formed by at least two flanks (12, 13) which extend transversely to the axis (29) of the shaft (4). door lock after claim 4 , characterized in that the flanks (12, 13) are positioned at an angle of approximately 90° to one another. door lock after claim 4 , characterized in that in a first position of the connecting link (6) the flanks (12, 13) release the locking bar (22) so that the door (2) can be opened. door lock after claim 4 , characterized in that in a second position of the link (6) a first flank (12) of the link (6) blocks the locking bracket (22), so that the door (2) is prevented from opening. door lock after claim 4 , characterized in that in a third position of the connecting link (6) the second flank (13) is designed to lift the locking bracket (6) so that the door (2) can be opened. door lock after claim 2 , characterized in that the shaft (4) is adjustable in the direction of its longitudinal axis (29) between a release and a blocking position. door lock after claim 1 , characterized in that the locking pin (14) is formed in two parts and is equipped on its inside (30) with latching surfaces (16, 20). door lock after the claims 2 and 10 , characterized in that the shaft (4) is designed to correspond to the latching surfaces (16, 20). door lock after the claims 2 and 10 , characterized in that the shaft (4) in its blocking position prevents the locking bracket (22) from slipping out of the position on the latching surfaces (16, 20). door lock after claim 1 , characterized in that the door handle (24) is connected to the locking pin (14). door lock after claim 1 , characterized in that the door handle (24) is connected to the locking bracket (22). door lock after claim 1 , characterized in that the locking bracket (22) is connected to the shaft (4). door lock after claim 1 , characterized in that the door (2) is connected to the locking bar (22). door lock after claim 1 , characterized in that the door (2) is connected to the locking pin (14). door lock after claim 1 , characterized in that the locking bracket (22) is designed as a leaf spring. door lock after claim 1 , characterized in that the locking link (20) is designed as a body running helically to the axis (29) of the shaft (4). door lock after claim 1 , characterized in that the locking pin (14) has a locking link (15) in addition to the locking link (16, 20).

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