ES2309436T3 - DOOR OPENING / CLOSING DEVICE IN AN ELECTRIC OVEN. - Google Patents

Abstract

An electric oven (1) including a door opening / closing apparatus, said electric oven (1) having a cavity (3) in which a high temperature situation is formed, a door (30) for selectively opening / closing the cavity (3), and a door opening / closing structure for exactly opening / closing the door (30), the door opening / closing apparatus comprising: a coupling part (65) formed on the door (30) ; a hook (60) arranged to selectively grab the hitch part (65); a cam guide (73); and a cam (72) inserted in the cam guide (73), to move the cam guide (73), said cam (72) being adapted to be rotated by an external force; characterized in that said engagement part (65) is formed on an inner side of the door (30); and said cam guide (73) is formed in a hook body (60).

Description

Door opening / closing device in an oven electric.

Background of the invention Field of the Invention

The present invention relates to an apparatus of door opening / closing in an electric oven, and more particularly, to a door opening / closing apparatus in a electric oven, which can indicate exactly a state of opening / closing the electric oven door and protect from Safe way a cavity when the door is closed. Besides, the The present invention relates to an opening / closing apparatus of door in an electric oven, in which the electric oven is not operates with the involuntary use of a user so that the oven Electric can be used more safely.

Description of the related technique

In general, an electric oven is a device for cooking food by heating a heating element electric with food placed inside a cavity. He electric oven can perform a gratin function ("grill") or oven using radiant heat of the element electric heating or convection hot air injection of a convection fan. Also, in case you additionally provide a magnetron, a wave is radiated electromagnetic generated from the magnetron into the cavity, so cooking food can be done even more quickly.

In general, a door is formed on one side front of the electric oven and an operation of opening / closing the door in an upward / towards direction below by a hinge provided on a lower part of the door. A bolt forms on top of the door and it inserted in and hooks into a bolt housing hole provided on a front side of a main oven machine electrical, so that a state can be stably maintained closed the door. When a user intends to open the door, it releases the bolt by a predetermined mechanism so that A user can open the door. In addition, the system is known in which is provided a default door switch to detect  that the bolt is inserted in the housing hole of the bolt, so if the bolt is inserted into the hole of the latch housing, the door is considered to have been closed and the electric oven starts to operate and if the bolt is not inserted, the electric oven does not operate even if a button is pressed Of start.

Meanwhile, the following problems exist when using the general electric furnace of the related technique described above. When the temperature inside the cavity reaches a high temperature and a user who still does not notice the high temperature opens the door, there is a risk of burning. To prevent such a risk, another related technique of US Patent No. 6,315,336 entitled " motorized self-cleaning oven latch " has been suggested. However, the previous US patent is difficult to make and the manufacturing cost is high due to its complicated structure.

Furthermore, even in the event that a careless user inserts a long rod into the hole of the bolt, the electric furnace of the related technique can detect the case as a closed door state. In that case, the electric oven can operate unexpectedly and the user can burn. Moreover, if the case described above occurs when the oven is overheated, there is a risk that a
fire.

The document EP-A-0617235 unveils an oven with a door and a device to block the door. He device includes a hook that pivots around a spindle under the action of the sliding movement of an element of sliding displaced linearly on the side of the cavity and that lock a protrusion from the appropriate hook to the hitch section. He hook selectively engages a locking piece located in the outer periphery of the oven door. The element of sliding moves linearly by means of an equipped motor with a cam inserted in an opening of the element of glide. The engine is started if the temperature inside the oven is higher than a point temperature of adjustment.

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Summary of the invention

It is an object of the present invention provide an electric oven that includes an appliance of door opening / closing that operates reliably and prevents safe way the damage to the body of a user that can be generated due to involuntary use, or the risk of a fire that may start in a room due to a high temperature generated by the electric oven.

In addition, one aspect of the present invention is provide a door opening / closing device for an oven electric, which can reduce manufacturing costs and improve the comfort in product application further simplifying a structure of the oven door opening / closing apparatus electric.

Advantages, objects and additional features of the invention will be set forth in part in the description to then and in part they will become apparent to experts in the technique after examining the exposure that follows or can be learned with the implementation of the invention. These goals and others advantages of the invention can be realized and achieved by the structure indicated in particular in the description and written claims thereof as well as in the drawings attached.

To get these objects and other advantages and according to the purpose of the invention, as performed and described extensively in this document, an electric oven with a Door opening / closing device has the characteristics of the claim 1.

According to the present invention, the safety of operation of the electric oven in which a high is generated temperature can be improved even more. Also, the apparatus of Door opening / closing is done more reliably, so which can further enhance the comfort of the oven user electric.

In particular, according to the present invention, damage to a user's body can be reduced due to use involuntary, or the risk of a fire.

In addition, a structure of the apparatus is simplified opening / closing of the electric oven door, so reduces manufacturing cost and increases comfort in the electric oven application.

It should be understood that both the description previous general as the following detailed description of the present invention are exemplary and explanatory and are provided to provide a further explanation of the invention as vindicate

Brief description of the drawings

The attached drawings, which are included for provide a further understanding of the invention and it incorporate in, and constitute a part of, this application, illustrate embodiment / embodiments of the invention and together with the description they serve to explain the principle of the invention. In the drawings:

Figure 1 is a perspective view of a electric oven to which the present invention is applied;

Figure 2 is a cross-sectional view, taken along line I-I 'of figure 1, and which illustrates a construction of a bolt;

Figure 3 is a cross-sectional view, taken along line II-II 'of the figure one;

Figure 4 is a view illustrating a state before a bolt is not inserted into a second structure of door opening / closing;

Figure 5 is a view illustrating a state in which a bolt is inserted to a certain extent and a first micro switch is on;

Figure 6 is a view illustrating a state in which a bolt is fully inserted and the Both first and second micro switches are on;

Figures 7 and 8 are views illustrating that a foreign material is inserted into the second structure of door opening / closing;

Figure 9 is a cross-sectional dress, taken along line III-III 'of the figure one;

Figure 10 is a side view of a first door opening / closing structure; Y

Figures 11 to 13 are views illustrating sequentially a procedure of movement of a hook in the First door opening / closing structure.

Detailed description of the invention

Reference will now be made in detail to the Preferred embodiments of the present invention, examples of the which are illustrated in the attached drawings.

Figure 1 is a perspective view of a electric oven to which the present invention is applied.

Referring to figure 1, an oven 1 Electric according to the present invention includes: a cavity 3 which It has a heating element inside; a door 30 formed on one side of cavity 3, to open / close selectively so that food can be introduced and removed; a pair of bolts 20 provided on an inner side of the door 30; and a housing hole 6 provided on one side of a housing 5, to fix the door 30 housing the latch 20. In addition, a part of hitch such as a ring 65 formed approximately in one part center of the inner side of the door 30, and a hook 60 for selectively engage with the hitch part 65 in its inside and grab the hitch part 65 so that the door 30 cannot be opened when door 30 is in a closed state.

The operation of the opening / closing device Door according to the present invention will be briefly described continuation. If a user closes cavity 3 by taking the door 30 with one hand, bolt 20 is inserted into hole 6 of accommodation and is fixed by a second structure of default door opening / closing formed in hole 6 of accommodation. When bolt 20 is inserted in hole 6 of housing, the second door opening / closing structure detects the insertion of the bolt 20, thereby checking the door detection 30. In addition, the second structure of door opening / closing performs the function of determining that the door is not closed when a foreign material is inserted, not the bolt 20.

In addition, to avoid dangerous circumstances unexpected such as a case where the cavity heats up up to high temperature during oven operation electric and a user does not recognize such high temperature and opens the cavity, a first opening / closing structure of door that makes the hooking part 65 catch on the hook 60. The first door opening / closing structure can form in an electrical equipment unit in a top of The cavity.

The first opening / closing structure of door can be understood as a door locking device and the second door opening / closing structure can be understood as a door interlock device. More specifically, the door interlock device is a default structure to prevent the door from being detected as closed using a door switch formed inside hole 6 of accommodation when a user involuntarily inserts a rod in the hole 6 of accommodation. If the door is detected as closed due to involuntarily inserted rod and oven electric starts to operate, a circumstance may occur dangerous such as a fire in a room. Therefore the door it should be detected exactly as closed only when the bolt 20 is reasonably inserted.

Meanwhile, the electric oven 1 of the present invention further includes: an operating unit 4 for operating the electric oven 1 according to the intention of a user; a hole 2 outlet to steam out generated water while they are cooking food inside cavity 3; a fan 7 convection formed inside the cavity 3, to make circulate by convection air inside the cavity 3. In addition, if necessary, a hot plate (not shown) is provided on a upper surface of the electric oven so that it can be placed a kitchen utensil such as a pot and the foods.

Figures 2 to 8 are views illustrating a door interlocking apparatus according to the present invention. In reference to figures 2 to 8, the apparatus will be described in detail Door interlock.

Figure 2 is a cross-sectional view, taken along line I-I 'of figure 1, and which illustrates a construction of a bolt. In reference to the Figure 2, the bolt 20 is formed inside the door 30 and the bolt 20 can operate stably in a position of adjustment. To maintain the stable operation of bolt 20, they provide a bolt 21 of the bolt that functions as a pivot of the bolt 20 in a central position of an operation of the bolt, and a bolt spring 22 connecting a rear end of the bolt 20 with a bolt fixing part 23 to operate the bolt 20 elastically. The bolt 20 turns slightly in a clockwise around pivot 21 of the bolt during a door closing operation 30 and once the bolt 20, bolt 20 rotates again counterclockwise. At that point, since force is constantly applied by the that bolt 20 would rotate counterclockwise through the spring 22 of the bolt, a position of the bolt 20. In addition, a head 24 of the hook-shaped bolt it is formed at a front end of the bolt 20, therefore it can a bolt insertion operation stably performed 20 and after the bolt 20 is inserted, a operation is engaged and a door position can be fixed 30

Figure 3 is a cross-sectional view, taken along line II-II 'of figure 1 and illustrating a second door opening / closing structure. Referring to Figure 3, a plate 40 of the bolt is formed inside the housing hole 6. Plate 40 of bolt performs the function of detecting if bolt 20 is inserted or not, together with the function of setting a position of the bolt 20. Also, if a foreign material such as a plug, not bolt 20, bolt plate 40 can perform the function to detect that the door is not closed.

The bolt plate 40 includes: a plurality of operating parts 45, 48 and 50 to be displaced by the bolt head 24 when bolt 20 is inserted inside of the housing hole 6; micro switches 41 and 42 for detect the insertion of the bolt 20 by movements of accommodation of operating parts; and a piece 53 of latch latch to guide the insertion operation of the bolt 20 and fix a position of the inserted bolt 20.

More specifically, the pieces of operation include: a first operating part 45 that it will be touched first when bolt 20 is inserted; a third operating part 50 pressed in cooperation with the first operating part 45; and a second operating part 48 that moves sequentially after the first one moves operating part 45. In addition, the first piece 45 of operation, which is a plate-shaped element, rotates on a first pivot 46, and a pressure piece 51 extends from a predetermined position of the first operating part 45. The second operating part 48 has an end that touches the head 24 of the bolt and another end that touches a second button 44 of switch of the second micro switch 42 to be rotated around the second pivot 49. In the third piece 50 of operation, one end is fixed to the first micro switch 41 and another end is pressed by the pressure piece 51 to make a first switch button 43 turn on. The pieces of operation are formed in the form of plates, so the cooperative operation of the operating parts can perform quickly.

In addition, a spring 47 is interposed between another end of the first operating part 45 and the plate 40 of the bolt. A position of the first piece 45 of operation by spring 47. For example, if bolt 20 not inserted, the first operating part 45 fits to rotate counterclockwise on the first pivot 46. By of course, since the first operating part 45 is made turn counterclockwise, pressure piece 51 and third operating part 50 do not touch each other, therefore the first micro switch 41 is in an off state. In addition, in a state in which the first operating part 45 is rotated in counterclockwise, a terminal of the pressure piece 51 pushes the second operating part 48 so that the second part 48 operating can be turned counterclockwise. By therefore, the second micro switch 42 is also in a state off.

If bolt 20 is inserted in a state of this type, the first operating part 45 and the second part 48 operating sequentially touch the head 24 of the bolt. The first operating part 45 continuously moves the third 50 piece of operation. After that; the micro switch 41 it is switched on by the third operating part 50, and the second micro switch 42 is switched on by the second part 48 of operation. The micro switches 41 and 42 light up sequentially, so that gate 30 can be detected as closed normally. Of course, the ignition operations of the micro switches 41 and 42 are supplied to a controller of the electric oven, and a range of the detection signal is evaluated continuous supplied, so that door 30 is detected as closed. If a foreign material such as a spoon is inserted into the housing hole 6, the operating parts 45 and 48 They do not operate continuously. In that case, the Door 30 is not closed because other material is inserted, not the bolt 20.

Figures 4 to 6 are views that sequentially illustrate a bolt insertion process. Figure 4 illustrates a state just before the bolt is inserted, Figure 5 illustrates a state in which the bolt is inserted to a certain extent and the first micro switch 41 is turned on, and Figure 6 illustrates a state in which the bolt is fully inserted and the second micro switch 42 is also on as well as the first micro switch
41.

Referring to figure 4, before it insert the bolt 20, the first operating part 45 is made turn counterclockwise using spring 47 and part 51 of pressure only touches the third operating part 50, no thereby applying no force on the third piece 50 of functioning. At this point, micro switches 41 and 42 first and second they are all in an off state. In reference to the Figure 5, the head 24 of the bolt touches the first piece 45 of operation, and the first operating part 45 is made turn clockwise on the first pivot 46. If the first operating part 45 is rotated, the pressure part 51 is spins clockwise in general, pressing the third 50 piece of operation. So, the third piece 50 of operation presses the first mode switch button 43 the first micro switch 41 can be turned on. Referring to the Figure 6, if it is inserted further, the head 24 of the bolt pushes the second operating part 48 to rotate it in clockwise At this point, a terminal part of the second operating part 48 presses the second button 44 of switch so that the first micro switch can be turned on 42. In addition, if bolt 20 is fully inserted, head 24 of the bolt is hooked on the bolt coupling part 53, of so that the bolt 20 can be separated only when a default external force. Therefore, it can be set so stable a closed door position 30.

Meanwhile, micro switches 41 and 42 are turn on sequentially during a series of operations of the 45, 48 and 50 operating parts. According to an experiment, it generates a time difference of approximately 4 ms. The signal of Continuous detection of the micro switch is supplied to the controller of the electric oven so that it can be detected if the door is closed normally. Of course, since a continuous supply of the detection signal may have an error to some degree, may be considered a time difference of 4 ± 1 ms as closing of the door.

It is expected that the sequential operation of the micro switch via an interlock device of the second door opening / closing structure prevents a circuit to stop a safety device provided inside the micro switch connect simultaneously. If the circuit for the device security operating in cooperation with the micro switch is connected simultaneously to operate, a false switch is operated power, so that a region of formation of electric arc, in which the electric oven operates automatically Without an instruction from a user.

Meanwhile, in an opening operation of the door, a hitch position of the hitch part 53 of the bolt and head 24 of the bolt is released, and head 24 of the bolt is rotated clockwise a predetermined amount to be expelled through the hole 6 of the housing. In at this point, the first operating part 45 is rotated in counterclockwise direction by force of spring 47, the second operating part 48 is also rotated in the direction counterclockwise by means of a pressure operation of part 51 of pressure, and the third operating part 50 is restored to its original position through its own elasticity.

Figures 7 and 8 illustrate a sequence of operation of the second door opening / closing structure when a pin is inserted, not the bolt, in the second Door opening / closing structure. In reference to the figures 7 and 8, if a foreign material such as a pin P is inserted by error in hole 6 of accommodation by a user, the first micro switch 41 can be turned on normally by the first operating part 45. However, it is easily expected that the P plug requires a little more time to operate the second operating part 48 than bolt 20 because it may take longer time until the first operating part 45 is pushed to its end using pin P to push the second operating part 48, and such time may be at least more than 4 ms. In addition, the second operating part 48 may not push through pin P, depending on the cases.

Since the closing of the door can be detected exactly by the second structure of Door opening / closing described above, evil is reduced operation associated with the door.

Figures 9 to 13 illustrate the first door opening / closing structure such as an apparatus for door lock It is intended that the first structure of door opening / closing prevent the door from opening even by an external force of a user while performing a thermal decomposition cleaning in the cavity, so that it can further improve user safety.

Figure 9 is a cross-sectional view. taken along line III-III 'of the figure 1, which illustrates the first door opening / closing structure. Referring to Figure 9, the first structure of Door opening / closing includes: hook 60 hooked selectively in the coupling part 65; and a unit 80 of hook operation to generate an external force through the which hook 60 is operated. The hook operating unit 80 includes: a motor 70 to generate power; a tree 71 of extended cam operation on a lower side of engine 70 of so that the hook 60 can be operated in cooperation with the engine 70; a cam 72 in an eccentric position from which the tree is formed 71 cam operation; and a cam guide 73 in which insert cam 72 so that an operation of default hook. In addition, a guide groove 61 having a elongated shape in an upward and downward direction is formed on each side of cam guide 73, and an element is provided 82 guide fixed to the hook operating unit 80 in the guide groove 61 to guide a movement of the hook 60, is provide. In addition, a micro switch 81 that performs the operation on / off according to a rotation angle of cam 72 se provides to control the closing / release of the door.

Meanwhile, the guide groove 61 is formed of oblique way at a predetermined angle of? so that the hook 60 can move in an inclined direction of an angle predetermined.

Figure 10 is a side view of the first Door opening / closing structure. In reference to the figure 10, the engine 70, the cam operating shaft 71 is illustrated extending downward from the engine 70, the cam 72 formed in one end of the cam operating shaft 71, and the micro switch 81.

In reference to the first structure of door opening / closing described above, will be described briefly an operation of the first structure of door opening / closing. When motor 70 is turned, it is made rotate the cam operating shaft 71. Tree 71 of cam operation rotates cam 72 in general and cam 72 pushes cam guide 73 so that hook 60 can move completely in directions up and down. Further, when the hook 60 moves in the directions up and towards below, the hook 60 is moved only in one direction predetermined by the interaction between guide slot 61 and the guide element 82, whereby the hook 60 can be engaged exactly on the hitch part 65. In addition, it is possible to make motor 70 rotation is stopped when rotation is detected on shaft 71 of cam operation by micro switch 81, and It can be considered that the door has been completely closed.

Figures 11 to 13 sequentially illustrate a hook movement process. Referring to figures 11 a 13, hitch part 65, cam 72, tree 71 of cam operation and guide element 82 are fixed and only hook 60 moves.

Referring to Figure 11, the hook 60 is hooked on the engagement part 65 so that the door 30 is closed. In such a state, even if a user intends to open the door, the door would not open. The inside of the cavity may be in a state where food debris is thermally decomposing by high temperature. The cam operating shaft 71 is rotated, so that the cam 72 is rotated around the cam operating shaft 71. The cam operating shaft 71 forces the hook 60 to generally move by a push / pull operation of the cam guide 73. The hook 60 moves in a predetermined direction by an interaction between the guide element 82 and the guide slot 61. In particular, since the guide groove 61 is formed obliquely from the upper left to the lower right, the hook 60 also moves
in the direction inclined towards the upper left to separate completely from the coupling part 65.

Figure 12 illustrates that the hook 60 has been moved half the entire distance of movement with the cam rotated approximately 90 °, and Figure 13 illustrates that the hook 60 it has completely moved the entire distance of movement with the cam rotated approximately 180º.

In addition, although Figures 11 to 13 illustrate that the hook moves to a door opening direction, it is expected easily that the hook will move in a closing direction of door by moving cam 72 in one direction opposite.

Meanwhile, although the present embodiment explains that the hitch part is formed in the door and the hook is formed in the main oven machine, the hook and the hitch part can also be formed, of course, in the door and main machine, respectively. The configuration above can be applied in the same way to the second structure Door opening / closing.

In the door opening / closing device of the electric oven according to the present invention, the first structure Door opening / closing, a door lock structure, prevents the locked door from opening, and simultaneously the second door opening / closing structure, a structure of Door interlock, indicates exactly the opening / closing of the door. Thanks to such configuration, the first structure of Door opening / closing is operated only when it is detected that the door is completely closed by the second structure of door opening / closing. However, either the first or the second opening / closing structure can be applied selectively, depending on a specific type of application of the electric oven. That is, assembling the first structure of door opening / closing, it is possible to safely use the electric oven when the door is closed. Riding the second Door opening / closing structure, it is also possible to avoid that the electric oven is operated in an unsafe state that results of an involuntary behavior of a user. Of course all the spirit of the present invention can be fully realized if both the first and the same are used simultaneously second opening / closing structure.

In addition, although the structures of opening / closing first and second perform their operation of opening / closing using the bolt and the hitch part formed separately at the door, the opening / closing structures first and second can also operate in cooperation with each other using a bolt structure formed in a solidary manner in the door.

According to the door opening / closing device of the present invention, an accident can be avoided in advance that may occur due to oven malfunction electrical, and that way the safety can be further improved by Use the electric oven.

In particular, since opening is avoided of the door in case the inside of the cavity is maintained at high temperature due to involuntary use, the safety when using the electric oven. In addition, a erroneous detection that the door is closed due to the insertion of a foreign material, so the risk of a fire in a room due to the high temperature generated d the electric oven.

Moreover, the structure of the device is simplified opening / closing the electric oven door, so that the manufacturing cost can be reduced and the appliance can be applied in Convenient way to products.

It will be apparent to those skilled in the art. that various modifications and variations can be made in the present invention Therefore, it is intended that the present invention cover the modifications and variations of this invention provided that fall within the scope of the appended claims and their equivalent.

Claims (10)

1. An electric oven (1) that includes an appliance opening / closing door, said electric oven (1) having a cavity (3) in which a situation is formed high temperature, a door (30) to selectively open / close the cavity (3), and a door opening / closing structure for open / close the door exactly (30), comprising the opening / closing apparatus of door:

One part (65) hook formed on the door (30);

a hook (60) arranged to selectively grab part (65) of hitch;

a guide (73) of cam; Y

a cam (72) inserted in the cam guide (73), to move the cam guide (73), said cam (72) being adapted to be rotated by means of a external force;

characterized in that said engagement part (65) is formed on an inner side of the door (30); Y said cam guide (73) is formed in a hook body (60). 2. The electric oven (1) according to the claim 1, wherein the hook body (60) comprises a guide slot (61) to guide a movement of the hook (60), and a guide element (82) inserted in the guide groove (61). 3. The electric oven (1) according to the claim 2, wherein the guide groove (61) is formed of oblique way. 4. The electric oven (1) according to any one of claims 1 to 3, further comprising: a bolt (20) formed on an inner side of the door (30); a first (45) and a second (48) pieces of operation arranged to be sequentially operated by the bolt (20); Y a first (41) and a second (42) micro switches arranged to be sequentially switched by the first and second operating parts (45,48). 5. The electric oven (1) according to the claim 4, further comprising a spring (47) for guiding a position of the first operating part (45) connecting the first piece (45) of operation with a plate (40) of the bolt. 6. The electric oven (1) according to the claim 4 or 5, further comprising a third piece (50) of operation to turn on the first micro switch (41) acting in cooperation with the first operating part (45). 7. The electric oven (1) according to any one of claims 4 to 6, wherein the parts (45,48) of First and second operation rotate on a pivot (47) predetermined. 8. The electric oven (1) according to any one of claims 4 to 7, further comprising a part (53) latch latch for smooth bolt insertion (twenty). 9. The electric oven (1) according to any one of claims 4 to 8, wherein the parts (45,48) of first and second operation are arranged to be selectively touched. 10. The electric oven (1) according to any one of claims 1 to 9, wherein the cam (72) is inserted into the cam guide (73) so that the rotation of the cam (72) moves directly the hook (60) engaging and disengaging from the hitch part (65).