EP1258685B1 - Household appliance, in particular cooking oven - Google Patents

Description

The invention relates to a household appliance according to the preamble of claim 1.

From JP 10 141 674 A a recording device for a grill is known which is slidably provided in a grill chamber. A grill pan can be pulled out of the grill chamber on the grill handle, this movement being assisted by a spring.

From DE 40 23 949 A1 a household appliance, in particular an oven, is known. The oven has a baking oven muffle, the feed opening is closed by a rigid angle on sliding trains or on a baking cart attached, drawer-like sliding oven door. The sliding trains are guided in sliding tracks below the oven muffle.

Document JP 62 11 9329 A shows an oven with a carriage, which is driven by a spring device in the extension direction. To allow the whereabouts in the closed position, a closing force is applied in the opposite direction by another spring.

Further, the oven has a in the sliding track at least one sliding train arranged, the oven door against a muffle flange oppressive rederrastelnnchtung. The spring locking device has a slotted guide with along the sliding track in opposite directions inclined, spring-loaded guide sections, which cooperate with attached to the sliding trains support rollers.

The object of the invention is to provide a generic household appliance with increased comfort with low design effort. The object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

The invention is based on a household appliance, in particular an oven, with a carriage and a door and a spring device.

It is proposed that the carriage driven by a force of the spring device is extendable, and the spring device acts in the retracted state of the carriage with a smaller force in the extension direction of the carriage than in an at least partially extended state of the carriage.

However, the force acting in the extension direction is reduced in the retracted state of the car by a lever mechanism, in particular by changing with the movement of the carriage lever ratios. With a lever mechanism, a particularly structurally simple and cost-effective mechanism can be achieved.

It can be achieved with a structurally simple design a comfortable home appliance, in which the manual extension is omitted or at least supported. The force may be limited to the retracted state of the car, or performed with the movement of the carriage in its retraction direction decreasing, whereby the car can be retracted particularly comfortable. Further, by the reduced at least in the retracted state force in the opening direction, in particular with a small closing force that can be generated by a weight of the car, a locking mechanism and / or a closing spring, a secure closing of the door can be achieved. The force acting in the extension direction can be reduced stepwise or continuously with various devices that appear appropriate to a person skilled in the art, for example by means of a device which displaces a spring support of a spring generating the force in the extension direction when the vehicle retracts or the spring is released or released Spring with a corresponding spring characteristic, etc.

In a further embodiment of the invention, it is proposed that the lever mechanism has hingedly interconnected levers which essentially form a quadrangle, advantageously a rhombus, wherein a first diagonal of the quadrangle extends parallel to the extension direction and in a second, perpendicular to the extension diagonal of the Rectangular a lever tensioning tension spring is introduced. It can be avoided structurally simple with a few components relative movement at a pivot point between the lever mechanism and the car and at a pivot point between the lever mechanism and a housing part of the household appliance. In principle, however, other, the expert appear appropriate sense lever mechanism conceivable, for example, the lever mechanism may be formed by a single pivoting lever, etc.

It is also proposed that the door is loaded in its closed position on the spring device with a closing force, making them particularly safe, with a high sealing effect can be closed.

If the spring device has at least one bistable spring unit, both a force in the closing direction of the door and a force in the direction of extension of the carriage can be achieved with a spring unit, in particular with a spring. Additional components and installation space can be saved.

However, the spring device comprises at least a first, acting in the closing direction of the door and a second, acting in the extension of the carriage spring unit, the different acting forces can be achieved particularly simple design and possibly also different dimensions. Further, in particular, the closing force of the first spring unit can advantageously be made reducible via an operating unit for opening the door, so that the car can automatically extend after a reduction of the closing force, driven by the second spring unit. In principle, however, a bistable spring unit with a corresponding actuator unit can be performed. Further, it is conceivable to combine a bistable spring unit with a second spring unit, whereby in a position or over a distance of the carriage, the spring units can mutually complementarily act on the car and / or on the door.

In order to operate the actuator unit with a small force, this is advantageously carried out with an actuator, for example with an electromagnetic, electromotive, pneumatic and / or hydraulic actuator, etc. It is also possible to perform the actuator purely manually operated, for example with a Bowden cable and / or an actuating linkage, etc.

The door is advantageously attached to the car and mounted with this displaceable. In an oven baking trays can be hung directly in the door, a side, the baking trays supporting frame can be saved and it can be achieved advantageous accessibility. Furthermore, the closing force can advantageously be transmitted to the door via the car. However, the door can also be designed to be pivotally mounted. The car can be on the door or an additional unit, such as a spring unit and / or a latch unit, etc., are kept in its retracted state.

From the retracted state of the carriage, the spring device acts only in a first part, advantageously up to about half of the total distance with the force in the extension direction on the carriage, can easily achieve a harmonious movement of the carriage and in particular can in the direction of extension to the end of the route automatically before a final position a reduced speed of the car can be achieved.

Furthermore, the harmonious movement of the carriage can be further improved with a brake unit which brakes the carriage in the extension before its end position over a distance. It can be achieved a particularly smooth transition of the car in its final position. In addition, with the brake unit unwanted closing or retraction of the car can be avoided.

In a further embodiment, it is proposed that the car is decoupled from at least one position in the extension direction of the spring device, whereby this can be easily removed completely without much effort, for example, to clean the car, etc.

The solution according to the invention can be used in various household appliances which appear suitable to the person skilled in the art, for example in dishwashers, etc., but especially in ovens whose oven door can be closed particularly securely by a corresponding spring device and comfortably opened together with a baking cart.

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

einen schematisch dargestellten Backofen in einer Seitenansicht mit einem Teilschnitt,

Fig. 2

eine Federvorrichtung des Backofens aus Fig. 1 schräg von oben in einer einem ausgefahrenen Backwagen zugeordneten Stellung,

Fig. 3

die Federvorrichtung aus Fig. 2 in einer Draufsicht in einer dem eingefahrenen Backwagen zugeordneten Stellung,

Fig. 4

einen Schnitt entlang der Linie IV-IV in Fig. 3,

Fig. 5

einen Ausschnitt V aus Fig. 2 von vorn mit einem Aktuator in einer Verriegelungsstellung,

Fig. 6

den Ausschnitt V mit dem Aktuator in einer Entriegelungsstellung,

Fig. 7

eine schematische Darstellung einer zu Fig. 2 alternativen Federvorrichtung kurz vor einer einem eingefahrenen Backwagen zugeordneten Stellung,

Fig. 8

die Federvorrichtung aus Fig. 7 in einer dem eingefahrenen Backwagen zugeordneten Stellung.

Show it:

Fig. 1

a schematically illustrated oven in a side view with a partial section,

Fig. 2

a spring device of the oven of FIG. 1 obliquely from above in a position assigned to an extended baking carriage,

Fig. 3

2 in a plan view in a position assigned to the retracted baking carriage,

Fig. 4

a section along the line IV-IV in Fig. 3,

Fig. 5

2 shows a section V from the front with an actuator in a locking position, FIG.

Fig. 6

the detail V with the actuator in an unlocked position,

Fig. 7

a schematic representation of an alternative to FIG. 2 spring device shortly before a retracted baking carriage assigned position,

Fig. 8

the spring device of Fig. 7 in a retracted baking carriage associated position.

Fig. 1 shows a schematically illustrated oven in a side view with a partial section. The oven has an oven muffle 10, which is open to the front of the oven and limited by a muffle flange 84. Further, the oven has a baking tray 11, to which a baking oven door 12 is fixed and designed to be displaceable with the baking tray 11. On the oven door 12 hook-shaped holding elements 31 are fixed, where food supports 32 are suspended. The baking cart 11 has two horizontally extending sliding cables 33, 85 (FIGS. 1 and 3), which are rigidly connected to the oven door 12. Each shift train 33, 85 immersed in a below the oven muffle 10, housing-fixed displacement track 34 and is horizontally movable therein by means of a roller guide. For this purpose, each sliding train 33, 85 has a roller 35, while a support roller 36 is fixedly arranged on each sliding track 34.

The oven door 12 is loaded in its closed position via a first spring unit 18 of a spring device 13 with a closing force (FIG. 3). The first spring unit 18 has in the rear, lower portion of the oven a horizontal, transverse to the direction of movement the back carriage 11 extending guide channel 37, in which a linkage 38 is guided displaceably (Fig. 1, 2 and 3). On the linkage 38 is laterally outwardly each a spring support 39, 40 attached. On the spring support 39, 40 a helical compression spring 41, 42 is supported, which acts laterally outwardly on a run in the guide channel 37 carriage 43, 44, which protrudes with one end of the guide channel 37. At the outwardly projecting end of the carriage 43, 44, a roller 45, 46 is rotatably mounted, which cooperates in the closed position of the oven door 12 or in the retracted state of the baking carriage 11 with a cam slide train 33, 85 integrally formed cam track 47, 48 and the baking tray 11 thereby loaded in its retraction 16 and the force acting on the oven door 12 closing force.

The linkage 38 is connected between the carriages 43, 44 in a recess 49 of the guide channel 37 via pivotable levers 50, 51 with an electromagnetic actuator 21 of an actuating unit 20 (FIGS. 2, 3 and 5). The actuator 21 is mounted in the assembled state via a retaining plate 79 on a housing wall of the oven, not shown.

The baking tray 11 is loaded in the retracted state via a second spring unit 19 of the spring device 13 in its extension direction 15 with a force. The second spring unit 19 is arranged in the rear, lower portion of the oven and has a lever mechanism 22 with articulated levers 23, 24, 25, 26 which form a rhombus substantially, wherein a first diagonal 27 of the rhombus is parallel to the extension direction 15 and in a second, perpendicular to the extension direction 15 extending diagonal 28 of the rhombus, a lever 23, 24, 25, 26 spanning tension spring 29 is fixed.

The rear levers 23, 26 are articulated on the side facing away from the baking carriage 11 on a bottom plate 53, which also forms a rear wall 54 to which the guide channel 37 of the first spring unit 18 is attached. On the baking carriage 11 side facing the rear levers 23, 26 each have a T-shaped sheet metal part 55, 56 hingedly connected to the front levers 24, 25. In the T-shaped sheet metal parts 55, 56, the tension spring 29 is mounted in holes 57, 58. The front levers 24, 25 are articulated on their side facing the baking carriage 11 on a carriage 59, the two guide bolts 62, 63 formed by screws 60, 61 along two guide the first diagonal 27 is guided. The carriage 59 is formed by a sheet metal part and is guided on a T-shaped plastic bottom plate 64 which is fixed on a metal floor 65. Instead of sheet metal, the carriage could also be made of plastic and be guided directly on a sheet metal base plate. Towing carriage 11 towards the carriage 59 has an angled portion 66 which forms a contact surface 67 for the baking tray 11.

If the oven muffle 10 is to be opened and the baking tray 11 is extended, an operating button 52 of the actuating unit 20 is actuated by an operator (FIG. 1). The actuator 21 is activated, and a plunger 86 of the actuator 21 is electromagnetically retracted (Fig. 6). The levers 50, 51 are pivoted, and the spring supports 39, 40 are displaced in the guide channel 37 in the direction of the actuator 21, whereby the helical compression springs 41, 42 are relaxed, and the closing force generated by the first spring unit 18 is reduced, so that the baking tray 11, driven by the second spring unit 19, can extend. The actuator 21 is driven to save energy with a short pulse and after the baking tray 11 with its curved paths 47, 48 and after a vertex of an inwardly directed arc of the cam track 47, 48 has passed the rollers 45, 46, back to its original position , It would also be conceivable, however, that the actuating unit 20 holds the helical compression springs 41, 42 in their relaxed position until the baking carriage 11 has passed the rollers 45, 46 after entering the apexes of the curved paths 47, 48.

The baking tray 11 can be extended without operating the operating knob 52. The carriages 43, 44 are deflected via the cam tracks 47, 48, counter to the spring force of the helical compression springs 41, 42.

The second spring unit 19 acts, starting from the retracted state of the baking carriage 11 only in a first part of the entire distance in the extension direction 15 on the baking tray 11, on a connected to the sliding trains 33, 85 cross member 68 of the back carriage 11 (Fig. 3). , After the baking tray 11 has overcome approximately half of its entire distance in the extension direction 15, the carriage 59 of the second spring unit 19 comes with the screws 60, 61 at the end of the guide grooves 62, 63 to the system (FIG. 2), and the baking carriage 11 is in the extension 15 of the second spring unit 19 and der decouples the entire spring device 13 and moves through its kinetic energy further in the extension direction 15th

Shortly before its end position, the baking carriage 11 runs with its cross member 68 on spring-loaded brake shoes 69, 70 of a brake unit 30 and is gently braked over a defined distance (Fig. 3). The brake shoes 69, 70 are formed by plastic shells which are hooked at a front end with a molded hook 71 in a projection 72 of a lower, attached to the bottom plate 65 plastic tray 73 (Fig. 4). At a rear end, the brake shoes 69, 70 are latched via a latching connection 74, 75 to the lower plastic shells 73 and are pivotally mounted on the latching connection 74, 75. Between the brake shoes 69, 70 and the lower plastic shell 73, a helical compression spring 76 is arranged, via which the brake shoes 69, 70 are spring-loaded upwards in the direction of the backing carriage 11.

When retracting the back carriage 11 this is pushed by an operator with its cross member 68 of the brake shoes 69, 70. Subsequently, the cross member 68 comes with the contact surface 67 of the carriage 59 to the system, and the second spring unit 19 is biased during the further retraction of the baking carriage 11. By acting in the lever mechanism 22 and during movement changing lever arms acting in the extension 15 force of the second spring unit 19 decreases with the movement of the baking carriage 11 in the retraction 16 from. Between the rear and the front levers 23, 24, 25, 26, an acute angle, and the tension spring 29 acts substantially in the longitudinal direction of the lever 23, 24, 25, 26th

The baking tray 11 can be easily inserted, and the oven muffle 10 can be safely closed with the oven door 12 via the spring unit 18 with a small closing force. The baking tray 11 comes at the end of its path in the retraction direction 16 with its cam tracks 47, 48 with the rollers 45, 46 of the first spring unit 18 in abutment, and the carriage 43, 44 of the first spring unit 18 are in the guide channel 37 against the spring force of the helical compression springs 41, 42 inserted, namely, until, viewed from the rollers 45, 46 from a slope 80, 81 of the cam tracks 47, 48 is overcome, the rollers 45, 46 on a slope 82, 83 of the cam tracks 47, 48 come to rest and the helical compression springs 41, 42 via the carriages 43, 44, the rollers 45, 46 and on the slope 82, 83 of the cam tracks 47, 48 generate a closing force.

The spring device 13 and the spring units 18, 19 and the brake unit 30 are designed as an assembly that can be mounted as a unit in the oven and disassembled.

FIGS. 7 and 8 schematically show an alternative spring device 14 with a bistable spring unit 17. Substantially identical components are basically numbered with the same reference numerals. Furthermore, reference can be made to the description of the embodiment in FIGS. 1 to 6 with respect to the same features and functions. The following description is essentially limited to the differences from the exemplary embodiment in FIGS. 1 to 6.

The spring unit 17 has a lever mechanism 22 with hingedly interconnected levers 23, 24, 25, 26, which form a rhombus substantially, wherein a first diagonal 27 of the rhombus extends parallel to the extension direction 15 and in a second, perpendicular to the extension 15 extending diagonals 28 of the rhombus, a lever 23, 24, 25, 26 spanning tension spring 29 is attached.

In contrast to the second spring unit 19, the spring unit 17 generates in addition to a force in the extension direction 15 on a baking tray 11 also has a closing force. The spring unit 17 is connected to a front bearing in the extended state of the baking carriage 11 bearing 77 fixed to the baking carriage 11, wherein in the retracted state of the baking carriage 11, the bearing 77 is moved behind a bearing 78 via which the lever mechanism 22 attached to a housing part of the oven is, so that the tension spring 29 acts on the baking carriage 11 via the lever mechanism 22 in the retraction direction 16 and generates a closing force.

reference numeral

10

oven muffle

11

baking tray

12

oven door

13

spring device

14

spring device

15

of extension

16

Retraction / closing direction

17

spring unit

18

spring unit

19

spring unit

20

operating unit

21

actuator

22

lever mechanism

23

lever

24

lever

25

lever

26

lever

27

diagonal

28

diagonal

29

mainspring

30

brake unit

31

retaining element

32

food support

33

Schie reference

34

sliding track

35

caster

36

supporting role

37

guide channel

38

linkage

39

spring Plate

40

spring Plate

41

Helical compression spring

42

Helical compression spring

43

carriage

44

carriage

45

role

46

role

47

cam track

48

cam track

49

recess

50

lever

51

lever

52

actuating button

53

floor panel

54

rear wall

55

sheet metal part

56

sheet metal part

57

drilling

58

drilling

59

carriage

60

screw

61

screw

62

guide

63

guide

64

Plastic base plate

65

plate floor

66

Area

67

contact surface

68

crossbeam

69

brake shoe

70

brake shoe

71

hook

72

head Start

73

Plastic shell

74

locking connection

75

locking connection

76

Helical compression spring

77

depository

78

depository

79

Halteblech

80

pitch

81

pitch

82

gradient

83

gradient

84

muffle flange

85

Schie reference

86

tappet

Claims (11)

1. Domestic appliance, particularly baking oven, with a carriage (11) and a door (12) as well as a spring device (13, 14), which carriage (11) can be moved out driven by a force of the spring device (13, 14), which in the moved-in state of the carriage (11) acts on the carriage (11) by a lower force in movement-out direction (15) than in the case of an at least partly moved out state of the carriage (11), characterised in that the force acting in movement-out direction (15) is reduced in the moved-in state of the carriage (11) by a lever transmission (22).
2. Domestic appliance according to claim 1, characterised in that the lever transmission (22) comprises articulatedly interconnected levers (23, 24, 25, 26) which substantially form a quadrilateral, wherein a first diagonal (27) of the quadrilateral extends parallel to the movement-out direction (15) and a tension spring (29) tightening the levers (23, 24, 25, 26) is incorporated in a second diagonal (28), which extends perpendicularly to the movement-out direction (15), of the quadrilateral.
3. Domestic appliance according to one of the preceding claims, characterised in that the door (12) in its closed setting is loaded with a closing force by way of the spring device (13, 14).
4. Domestic appliance according to claim 3, characterised in that the spring device (14) comprises at least one bistable spring unit (17).
5. Domestic appliance according to claim 3 or 4, characterised in that the spring device (13) comprises at least one first spring unit (18) acting in closing direction (16) of the door (12) and a second spring unit (19) acting in movement-out direction (15) of the carriage (11).
6. Domestic appliance according to claim 5, characterised in that the closing force of the first spring unit (18) is at least reducible by way of an actuating unit (20) for opening the door (12).
7. Domestic appliance according to claim 7, characterised in that the actuating unit (20) comprises an actuator (21).
8. Domestic appliance according to one of the preceding claims, characterised in that the door (12) is fastened to the carriage (11) and mounted to displaceable therewith.
9. Domestic appliance according to one of the preceding claims, characterised in that the spring device (13), starting from the moved-in state of the carriage (11), acts on the carriage (11) with the force in movement-out direction (15) merely in a first part of the total travel path.
10. Domestic appliance according to one of the preceding claims, characterised in that the carriage (11) is braked in movement-out direction (15), prior to its end setting, by a braking unit (30) over a travel path.
11. Domestic appliance according to one of the preceding claims, characterised in that the carriage (11) is decoupled from the spring device (13, 14) from at least one setting in movement-out direction.

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