DE102009016812A1 - Door latch for thermal cooking and/or baking device, has rotating mechanism comprising multiple angle of rotation positions, where driven shaft serves as rotating mechanism and is connected to locking lug - Google Patents

Abstract

The latch has a door handle (24) which is rotatably supported in a lockable door (2) using a latch pin (14). The latch pin has a latch connecting rod (16) comprising a locking recess and a locking lug that is formed at the latch pin. A rotating mechanism (1) has multiple angle of rotation positions, where a driven shaft (4) serves as the rotating mechanism and is connected to the locking lug. The driven shaft has a connecting rod (6) which is supported by the latch pin and/or is arranged coaxial to the latch pin.

Description

The The invention relates to a door lock for a Thermal cooking and / or baking device, with one in one lockable door rotatably mounted door handle, with a locking pin, the at least one shutter backdrop having a detent recess and a corresponding to the locking pin trained locking bracket.

Such closures are approximately from the EP 1 111 175 known. This closure comprises a closure pin fastened to the device housing and a U-shaped spring clip which forms the locking element. The latter is constructed on the shaft of a handle mounted in the door leaf such that its crossbar is deflectable resiliently perpendicular to the axis of rotation. In addition to this actual locking mechanism exist in commercial ovens additional requirements with regard to the cleaning of these devices. This is done by means of aggressive chemical substances, so that it is important to be able to reliably lock the door while doing so. So far from the DE-OS 10 2006 013 519 known solutions for this purpose provide separate mechanisms, whereby such closures build comparatively complicated and expensive and expensive to produce.

In order to The object of the present invention is to provide a closure for a door to create that special Requirements for security against opening, z. B. is sufficient for certain cleaning processes.

These Task is solved in that the door lock equipped with a rotating mechanism whose angular positions an automatic locking or opening the door enable.

through This turning mechanism is now possible in the frame cleaning the device, if it is not an opening the door may come, the actual closure in the locked position and thus additionally against to secure unlocking. An accidental or even by technical failure conditional opening of the door is excluded, because thanks to the rotating mechanism unlocking the opening of the door is prevented.

A particular variant of the invention provides that as a rotation mechanism a driven shaft is used. With the adjustment of this wave preferably by rotation or its associated components goes the lock associated. By a rotation and / or longitudinal displacement of this Shaft can be used in conjunction with the locking bar the addressed Position be realized, in which the shaft is the locking bolt blocked.

Under Another idea is that the shaft is coaxial with the locking pin has arranged and / or axially supported by this backdrop. This backdrop, after appropriate rotation of the shaft described Occupy positions, being transverse to the axis of the shaft, eccentric arranged components play a significant role. ever after how the shaft is rotated and in what position it is is located, the backdrop blocked the locking bar, gives it free or even supports the opening process.

One Proposal for this provides that the scenery by at least two Flanks is formed, which is transverse to the axis of the Shaft extend and so to each other and / or to the locking bracket that their respective positions correspond to the previously described opening or locking states corresponds. This is on purposeful Such is the case when an edge is positioned so that an actuation the locking bracket is prevented in the appropriate position, while the other flank is even suitable, the locking bar with lift to allow the door to open.

It It is thought that the flanks at an angle of approx. 90 ° to each other, so that they are a kind L with a longer and a shorter leg form.

Concrete the backdrop is designed so that in a first position of the Setting the flanks release the locking bar, so that an opening the door is enabled. In other words, none the flanks blocked in this position the locking bar.

Different it looks, if in a second position the scenery a first Flank of the backdrop blocks the locking bar, allowing it to open the door is prevented. This is z. B. necessary if the cooking and / or baking device according to the invention subject to a cleaning process in which toxic chemicals to be used.

As already mentioned, it is also suggested that in a third position of the scenery, the second flank of the locking bar with raises, so that an opening of the door allows is. The sliding surface lifts the locking bracket from the position that the closed position of the door corresponds to, so that the locking bar from the detent position slips out on the locking pin; the door can be opened.

An alternative solution for a rotary mechanism provides that the shaft is adjustable in the direction of its longitudinal axis between a release and a blocking position. In this variant, the additional locking mechanism is therefore not by a shaft associated with the backdrop realized. Instead, the shaft is slidable in the direction of its longitudinal axis between a release and a blocking position with respect to the locking bracket.

In In this framework, it is recommended that the locking pin in two parts is formed and on its inside with locking surfaces equipped. Is the locking bar in the position reaches, in which it rests against the locking surfaces of the closure pin, so now, to achieve the closure position described above, the shaft in the direction of locking bar or locking surfaces be adjusted on the inside of the plug. there The shaft does not release the locking bar from its position at the locking surfaces of the spigot free. In other words, the shaft blocks slipping out of the locking bracket from the locking surfaces of the locking pin. corresponding to the closure pin, the locking bracket has two springy stored parts and has a kind of V-shape, so that he behind can rest against the locking surfaces of the closure pin.

In In this context, it should also be understood that the wave is corresponding is formed to the locking surfaces. This is especially true in the With regard to the described function, in which the shaft in their blocking position slipping out of the locking bracket prevented from the position on the locking surfaces.

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

Around particularly favorable spring properties for the To be able to realize a locking bar is provided that the locking bar is designed as a leaf spring. For the variant described, in which the locking bracket on the inside of the plug is supposed to engage as well thought that the locking bar formed in two parts is, so two V-shaped to each other positioned leg having.

Further Embodiments of the invention provide that the shutter backdrop as a helical to the axis of the shaft Body is formed or that the closure pin in addition has a Arretierkulisse to the shutter backdrop.

The Invention is characterized in particular by the fact that a particular appropriate mechanism is created, over which an automatic locking or opening the door for a baking and / or cooking appliance can be enabled. For this purpose, a turning mechanism used in the form of a wave, depending on their Turn angle positions the door blocked or open is. The shaft has either a backdrop on, by in the transverse direction is arranged to its longitudinal axis arranged flanks and depending on their positions opening or Closing the door is possible or Not. Or the shaft is between a release and a blocking position displaceable in the direction of its longitudinal axis, z. B. by Rotation. The latter embodiment requires that the Lock pin is formed in two parts, so also one Two-piece trained locking bracket on the inside of the Locking pin can snap, where he then by in the direction Locking bracket shifted shaft is fixed. This is one Closure for a door created, with a particularly sophisticated, technically uncomplicated and cost-effective fuse for the device This is done under certain circumstances to avoid certain dangers is to be kept closed, for example in the context of Cleaning or pyrolysis of stoves.

Further Details and advantages of the invention will become apparent from the following Description of the accompanying drawings in which a preferred embodiment with the necessary Details and items is shown. Each show schematic representations:

1 the state of the gate to open the door by hand,

2 a twisted backdrop so that the locking bar is blocked

3 a twisted gate so that the locking bar is pushed out and the door is open,

4 a two-piece locking bar in operation,

5 the state of opening the door by hand with two-part plug and locking bracket,

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 a 9 corresponding view with a further embodiment of a Türver statements,

11 Front views and top views of differently designed pegs,

12 different positions of a shutter backdrop to the door handle,

13 a 8th corresponding representation with a variant of the shutter backdrop and

14 a door lock with two locking pins.

In the position according to 1 can the locking bar 22 by turning the door handle 2 around the in 1a with the arrow 28 illustrated angles are brought into the position that opening the door 2 is possible. It is the described first position of the scenery 6 in which the flanks 12 . 13 the locking bar 22 release and the switch 45 is switched. This is illustrated in 1a by the reference numeral 22 ' provided locking bar. The turning mechanism 1 is in the form of the wave 4 realized to the effect that this coaxially arranged backdrop 6 having. With the reference number 43 is the position sensor of the sliding position for the automatic opening of the door, with the reference numeral 44 the position sensor of the link position for the blocked closure called. The reference number 45 The position sensor of the link plate supports the manual mode. The motor drive 46 the scenery is below.

In the illustration according to 2 will be the door 2 shown in closed condition. This corresponds to the described second position, in which the flank 12 the scenery 6 the locking bar 22 blocked. The scenery 6 is placed in a position in which the switch 44 is switched. The eccentric surface is in the form of the flank 12 placed in a position in which also when turning the door handle 2 the locking bar 22 can not slip out of position. The door 2 remains closed despite the operation of the door handle, because the flank 12 prevents the locking bar 22 can leave his position.

3 schematically shows a location of the backdrop 6 , which has previously been described as a third position and in which the switch 43 is switched and the sliding surface in the form of the flank 13 the scenery 6 the locking bar 22 from the position in which he is with the door closed. The locking bar 22 slips out of the plug 14 out; the door can be opened.

Shows another locking bar 4 , There is the locking bar 22 by two mutually prestressed, V-shaped legs arranged to each other 34 . 35 educated. The reliability can thus be increased and the power load of the carrier of the locking bracket 22 and the biasing force of the pawl 22 be reduced.

Also in the illustration according to 5 . 6 and 7 the locking bar is formed in two parts and consists of the two legs 34 and 35 as well as the spreader provided in between 49 , The same applies here to the two parts 47 and 48 existing plugs. The representation according to 5 in turn corresponds to the possibility to open the door by hand by removing the locking bar 22 with the thighs 34 . 35 the position on the inside 30 of the locking pin 14 , more precisely on the locking surfaces 16 . 20 can leave without this due to due to training or position of the rotary mechanism 1 in the form of the drive shaft 4 could or should be prevented.

Otherwise then in the presentation according to 6 , The wave 4 as a turning mechanism 1 is in the direction of its longitudinal axis 29 pushed forward, thereby blocking the locking bar 22 to the effect that this with his thighs 34 . 35 its position on the locking surfaces 16 . 20 on the inside 30 of the locking pin 14 can not leave. The latter is through two parts 47 and 48 formed by, illustrated by 6a , lie one above the other and thus in interaction with the spring locking clips 22 block the door against opening. With the reference number 49 is still the spring spreader between the two thighs 34 . 35 designated.

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

In 8th is shown a closure construction, in which on the front wall 3 of the device not otherwise shown a non-rotatable bearing holder 7 is attached. Through the warehouse 8th in the storekeeper 7 is the drive shaft 4 and with the drive shaft 4 firmly connected stoppers 14 rotatably guided. The drive shaft 4 is powered by a drive motor 11 driven. Between drive shaft 4 and engine 11 are a clutch 10 and a positioning device 9 intended. By means of the latter can via the position switches 38 . 39 . 40 the values of the opening angle can be adjusted. The coupling 10 protects the drive motor from overloading; in the event of a fault, the door can be flattened with a suitable tool 2 be opened. A variant in the form of a two-stage closure has two staggered in the axial direction scenes, namely a Arretierkulisse 15 and a shutter backdrop 16 on. The Arretierkulisse 15 holds over About the locking bar 22 the door 2 one gap width open. Through the shutter backdrop 16 will be the door 2 used on the door seal.

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

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

In 11 are different versions of a locking bracket 2 play. In the illustration according to 11a is the diameter of a small circle, the diameter of the detent recess 17 indicated, while the diameter of the large circle the outside diameter of the scenes 15 . 16 and 20 equivalent. In 11a has the locking bar 22 a curved front part, the better through the round contour of the detent recess 17 (small circle) is guided. In the variant in 11b becomes an angled front part of the pawl 22 from the plug 14 better managed than the straight variant in 11c ,

In 12 are different positions of the shutter scenery 16 concerning the door handle 24 with appropriate position of the locking bracket 22 played. In 12a the door is closed or closed, in 12d Turn the door by turning the door handle 24 open. In 12c the door is locked and in 12d It will open automatically without the door handle 24 is turned. In the illustration according to 12a is the door handle 24 in its vertical starting position, the shutter scenery 16 of the locking pin 14 is in a position corresponding to the angle y1. The door is closed (slammed) and kept in this position. In the schematic representation of 12b is the door handle 24 turned to the stop, this position corresponds to the angle x1. The shutter backdrop has the angle corresponding to the angle y1 relative to the angular position in 12a not changed. The locking bar is released. In the illustration according to 12c was the shutter backdrop 16 of the locking pin 14 placed in the angle corresponding to the y2 position. When turning the door handle 24 the locking bar remains 21 in the detent recess 17 the shutter backdrop 16 which means that the door can not be opened. According to 12d is the door handle 24 in the vertical starting position. The shutter backdrop 16 of the locking pin 14 is located at a position corresponding to the angle y3. The locking bar 22 is free and slips out of the detent recess 17 out. In this case, the door will be 2 automatically opened without the door handle 24 must be twisted.

In 13 is the shutter backdrop 20 a to the axis of rotation of the drive shaft 4 at a certain angle helically formed body. This will after closing the door 2 by turning the plug 14 the locking bar 21 with regard to the device front wall 3 and the slope portion of the shutter gate 20 used.

Finally shows 14 two locking pins 14 with mirror-image corresponding helical scenes 20 , By tangential forces caused by sliding or slipping of the locking bracket 21 are formed on the helical surface, the stop of the locking bracket 21 in the detent recess 17 deteriorated. Through the helical body of the upper plug 14 the bracket is in the detent recess 17 held. The lock function and the automatic opening of the door are retained.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1111175 [0002]
• - DE 102006013519 A [0002]

Claims (21)

Door lock for a thermal cooking and / or baking appliance, with one in a lockable door ( 2 ) rotatably mounted door handle ( 24 ), with a plug ( 14 ), which has at least one shutter ( 16 . 20 ) with a detent recess ( 17 ) and a corresponding to the closure pin ( 14 ) trained locking bracket ( 22 ), characterized in that the door lock with a rotating mechanism ( 1 ), the angular position of which is an automatic locking or opening of the door ( 2 ) enable. Door lock according to claim 1, characterized in that as a rotary mechanism ( 1 ) a driven shaft ( 4 ) serves. Door lock according to claim 2, characterized in that the shaft ( 4 ) a coaxial with the locking pin ( 14 ) and / or axially supported by this backdrop ( 6 ) having. Door lock according to claim 3, characterized in that the scenery ( 6 ) by at least two flanks ( 12 . 13 ) which extends in the transverse direction to the axis ( 29 ) the wave ( 6 ). Door lock according to claim 4, characterized in that the flanks ( 12 . 13 ) are positioned at an angle of about 90 ° to each other. Door lock according to claim 4, characterized in that in a first position of the scenery ( 6 ) the flanks ( 12 . 13 ) the locking bar ( 22 ), so that opening the door ( 2 ) is possible. Door lock according to claim 4, characterized in that in a second position of the scenery ( 6 ) a first edge ( 12 ) the scenery ( 6 ) the locking bar ( 22 ), so that opening the door ( 2 ) is prevented. Door lock according to claim 4, characterized in that in a third position of the scenery ( 6 ) the second flank ( 13 ) the locking bar ( 6 ) is designed with lifting, so that an opening of the door ( 2 ) is possible. Door lock according to claim 2, characterized in that the shaft ( 6 ) in the direction of its longitudinal axis ( 29 ) is adjustable between a release and a blocking position. Door closure according to claim 1, characterized in that the closure pin ( 14 ) is formed in two parts and on its inside ( 30 ) with locking surfaces ( 16 . 20 ) is equipped. Door lock according to claim 10, characterized in that the shaft ( 6 ) corresponding to the locking surfaces ( 16 . 20 ) is trained. Door lock according to claim 10, characterized in that the shaft ( 6 ) in its blocking position slipping out of the locking bracket ( 22 ) from the position on the locking surfaces ( 16 . 20 ) prevented. Door lock according to claim 1, characterized in that the door handle ( 24 ) with the locking pin ( 14 ) connected is. Door lock according to claim 1, characterized in that the door handle ( 24 ) with the locking bar ( 22 ) connected is. Door lock according to claim 1, characterized in that the locking bracket ( 22 ) with the wave ( 4 ) connected is. Door lock according to claim 1, characterized in that the door ( 2 ) with the locking bar ( 22 ) connected is. Door lock according to claim 1, characterized in that the door ( 2 ) with the locking pin ( 14 ) connected is. Door lock according to claim 1, characterized in that the locking bracket ( 22 ) is designed as a leaf spring. Door lock according to claim 1, characterized in that the locking bracket ( 22 ) is formed in two parts. Door lock according to claim 1, characterized in that the shutter ( 20 ) as one to the axis ( 29 ) the wave ( 6 ) is formed helically extending body. Door closure according to claim 1, characterized in that the closure pin ( 14 ) in addition to the shutter scenery ( 16 . 20 ) a Arretierkulisse ( 15 ) having.