EP3258826B1 - Sliding and lifting mechanism of a shelf of an item of furniture or household device, item of furniture and household device - Google Patents

Description

The invention relates to a sliding and lifting mechanism of a shelf of a piece of furniture or household appliance with a scissors mechanism for removing the tray from a body of the furniture or household appliance and for lifting the tray. The invention further relates to a piece of furniture or a household appliance with such a sliding and lifting mechanism.

Such a sliding and lifting mechanism with scissors mechanism is from the document JP 2006 204 591 A known. The sliding and lifting mechanism is there for lifting a dish rack in a dishwasher. The basket is arranged on a scissors mechanism and can be pulled out together with this in a trough-like extract from the body of the dishwasher. When pulled out trough-like extract the basket can be lifted by a handle, whereby the scissors mechanism extends. In an upper position, the basket can be fixed by means of laterally exposed connecting means, for example bolts, in the upper area of the drawn-out tub. In this position, loading or unloading of the crockery basket can take place in an upright position of the user that relieves the back muscles and the spine.

Depending on the loading condition of the dish rack, lifting the dish rack on the handle may be cumbersome for a user. In addition, the said trough-shaped extension is required for locking the dish rack in the upper position. For a free-standing, for example, on an open door of the dishwasher guided dish rack is such an excerpt with high side walls for locking not available.

From the publication US 1,953,024 A is known a drawer extension, which is height adjustable by a scissors mechanism. The scissors mechanism is actuated by a lever which is arranged in the rear region of the drawer. The mechanism has a pin which serves to lock the mechanism in the intended height.

Also the publication US 2006/0043848 A1 shows a drawer extension, in which a tray can be extended via a scissors mechanism upwards from the opened drawer. For locking in the upper position is a locking mechanism which is arranged on a front of the drawer. For this purpose, however, the front of the drawer must be just as high as the shelf extended by the scissors mechanism can be. In a free-standing, guided on an open door of a dishwasher crockery basket such a lock is not feasible.

The pamphlets US 5,115,822 A and US 5,971,513 A describe in each case a liftable by a scissors mechanism crockery basket, which is guided on an open door of a dishwasher. In both cases, a locking in an upper position is achieved by blocking a displaceable end of a scissor lever in its horizontal movement. This is achieved by pressing the appropriate blocking lever on both sides. However, the operation with the upper basket raised at the same time is not very user-friendly.

The publication JP H10 179495 A also discloses a crockery basket that can be raised in an extended position by a scissors mechanism. There is an operating lever with a guideway into which a pin attached to the dish rack pin engages. The crockery basket can be easily raised by swinging down the operating lever. A lock in the upper position is not apparent from the Scriptures.

From the publication DE 297 19 804 U1 is a cabinet with an extendable shelf, which serves as a seat known. The seat is guided vertically displaceable by a scissors mechanism. After extension, the seat is raised by opening another padded tray by the pivoting movement of the other tray is transmitted via a lever system to a knee joint, which acts independently of the scissor mechanism on the seat. When fully pivoted another tray, the knee joint takes an overstretched position, whereby the seat is locked. By transmitting the pivoting movement of the other tray on the knee joint by means of the lever system results in a complex construction.

It is therefore an object of the present invention to provide a sliding and lifting mechanism of the type mentioned above, which allows a simple lifting and lifting the shelf in an upper position. In particular, a locking in the upper position should also be possible if an extract with high side walls for locking is not available.

This object is achieved by a sliding and lifting mechanism or a furniture or household appliance with such a sliding and lifting mechanism with the features of the independent claims. Advantageous embodiments and further development are specified in the dependent claims.

An inventive sliding and lifting mechanism of the type mentioned above is characterized in that it comprises a knee joint which is coupled to the scissors mechanism and locks the tray in a raised position. The knee joint, with a simple mechanical construction in an overstretched (locked) position, allows the tray to be locked in the up position without the need for a sidewall or similar high element to fix the tray in the up position can.

In this case, the knee joint is formed by a pivot lever and a toggle lever, wherein the pivot lever is pivotally connected by a user rotatably connected to the tray and the toggle lever is coupled to the scissors mechanism. By pivoting the pivot lever so the scissor mechanism can be pulled apart and the tray to be raised. With a suitable aspect ratio of the lever sides of the pivot lever, a power transmission can take place, which simplifies the lifting of the tray.

Further, the scissors mechanism is formed by at least two crossed and rotatably connected scissor levers, which are rotatably connected to one or both ends rotatably and slidably connected to the tray. The toggle is hinged to one of the scissor levers to act on the scissors mechanism.

In an advantageous embodiment of the sliding and lifting mechanism, the scissor levers each have at least one roller at their free ends. The roller is used for sliding movement of the sliding and lifting mechanism. By arranging the rollers on the scissor levers, the sliding and the lifting movement can be combined with a few design elements realized.

In a further advantageous embodiment of the sliding and lifting mechanism, an energy store is coupled to the scissors mechanism. Is preferred the energy storage a tension spring which is connected to at least one of the scissor levers. The tension spring may for example be mounted between two scissor levers. It is also possible to connect the tension spring only on one side with one of the scissors lever and on the other side with the toggle lever or the pivot lever.

The energy storage supports the operation of the scissors mechanism, especially in the initial phase of lifting. Advantageously, the energy storage can be designed so that a uniform power requirement when lifting the tray results. When connected to the knee lever or the pivot lever, the energy storage can also advantageously keep the knee joint in the raised position of the tray stretched and thus reduce the risk of unintentional release of the lock.

In a further advantageous embodiment of the sliding and lifting mechanism, a scissors mechanism with knee joint is arranged on each of two opposite sides of the tray. Preferably, each of the knee joints on a pivot lever, wherein the free, pivotable by the user ends of the pivot lever are interconnected by a common bow handle. In this way, the shelf is supported and raised evenly on both sides. The bow handle allows for easy operation and guarantees the synchronous movement of both scissors mechanisms.

An inventive furniture or household appliance has a body and a shelf with a sliding and lifting mechanism, wherein the shelf via the sliding and lifting mechanism from the furniture body can be pulled out and raised. The furniture or household appliance is characterized by a sliding and lifting mechanism described above. This results in the advantages mentioned in connection with the sliding and lifting mechanism.

In an advantageous embodiment of the household appliance, this has a device door, which provides at least one, preferably two raceways for rollers of the sliding and lifting mechanism. Preferably, a stop for the sliding and lifting mechanism is formed on the appliance door at the end of the at least one career. Particularly preferably, the sliding and lifting mechanism engages in an at least partially raised state in the stop so that it is rotatably connected to the stop. By the stop is a safe operation of the sliding and lifting mechanism given. The engagement of the sliding and lifting mechanism on the stop engagement prevents the rollers from being levered out of the raceway upon actuation of the lifting mechanism. The engagement can be realized, for example, by arranging a protruding bolt on a scissors lever of the scissors mechanism of the sliding and lifting mechanism, which engages in a curved guide curve formed in the stop.

Particularly advantageously, the sliding and lifting mechanism can be used in a dishwasher as a household appliance, wherein the tray is a dish rack of the dishwasher. Particularly preferably, the lower dish rack of the dishwasher is equipped with the sliding and lifting mechanism.

Figur 1a

eine Seitenansicht einer Geschirrspülmaschine mit geöffneter Geräteklappe und eingeschobenen Geschirrkörben;

Figur 1b

die Geschirrspülmaschine aus Figur 1a mit ausgezogenem unteren Geschirrkorb, der mit einem Schiebe- und Hubmechanismus ausgestattet ist;

Figur 1c

die Geschirrspülmaschine aus Figur 1a mit herausgezogenem und angehobenem unteren Geschirrkorb;

Figur 2a

eine isometrische Ansicht des unteren Geschirrkorb der in Figur 1 dargestellten Geschirrspülmaschine in einer herausgezogenen und abgesenkten Position;

Figur 2b

eine Detailansicht aus Figur 2a;

Figur 3a, 3b

mit der Figur 2a bzw. 2b vergleichbare Ansichten des Geschirrkorbs in einer teilangehobenen Position;

Figur 4a, 4b

mit Figur 2a bzw. 2b vergleichbare Ansichten des Geschirrkorbs in einer vollständig angehobenen Position;

Figur 5a

eine Seitenansicht des Geschirrkorbs aus Figur 2a in der abgesenkten Position und

Figur 5b

eine Detailansicht aus Figur 5a.

The invention will be explained in more detail using an exemplary embodiment with reference to figures. The figures show:

FIG. 1a

a side view of a dishwasher with open device flap and inserted baskets;

FIG. 1b

the dishwasher off FIG. 1a with extended lower crockery basket, which is equipped with a sliding and lifting mechanism;

Figure 1c

the dishwasher off FIG. 1a with lower basket raised and raised;

FIG. 2a

an isometric view of the lower dish rack of the dishwasher shown in Figure 1 in an extended and lowered position;

FIG. 2b

a detailed view FIG. 2a ;

Figure 3a, 3b

with the FIG. 2a and 2b comparable views of the dish rack in a partially raised position;

Figure 4a, 4b

With FIG. 2a and 2b comparable views of the dish rack in a fully raised position;

FIG. 5a

a side view of the crockery basket FIG. 2a in the lowered position and

FIG. 5b

a detailed view FIG. 5a ,

In the following description of the figures, terms such as top, bottom, left, right, front, back, etc. refer exclusively to the exemplary representation and position of the sliding and lifting mechanism or the tray chosen in the respective figures. The terms mentioned are not meant to be limiting. Through different working position and / or a mirror-symmetrical design of the illustrated sliding and lifting mechanism, these references can change.

In the figures, an embodiment of a sliding and lifting mechanism with scissors mechanism in different working positions and different views is shown. In all figures, like reference numerals designate the same or equivalent elements.

Shown is a dishwasher 1 as an example of a household appliance, in which the sliding and lifting mechanism is used for moving or lifting a crockery basket. It is noted that the sliding and lifting mechanism according to the application is also used in other household appliances, e.g. Cooking appliances, or even in a piece of furniture can be used. In this sense, the crockery basket, which can be moved or raised over the sliding and lifting mechanism, as an example of a shelf to understand. Other examples of a shelf are food carriers or drawers or other extracts that can be moved out of a carcass and lifted.

FIG. 1a shows the dishwasher 1 with body 2 and opened door 3 in a side view. From the body 2, only one side wall 21 is visible in this view. Inserted into the body 2 of the dishwasher 1 are two extendable crockery baskets 4 and 5, of which the upper is movable in a known manner in the horizontal direction, in order to open or close dishes.

The lower dish rack 5 is equipped with a sliding and lifting mechanism according to the application. The lower dish rack 5 is also horizontally movable and can be pulled out of the body 2. To this Purpose are formed in the door 3 in this view not visible careers. Furthermore, in the front area (in the FIG. 1a on the left), a stop 31 projecting upwards with the appliance door 3 open is formed with stop surface 32. Usually two parallel raceways are formed, wherein preferably a stop 31 is arranged on each of the raceways. Alternatively, it is also possible to provide such a stop 31 on only one of the two raceways.

FIG. 1b shows in the same way as the FIG. 1a in a side view, the dishwasher 1 with pulled out lower dish rack. 5 Figure 1c shows the dishwasher 1 with pulled out and raised lower dish rack. 5

The lower rack 5 includes a wire basket 51, in which the dishes to be cleaned can be sorted. Laterally on the wire basket 51 side frames 52 are mounted. The side frames 52 may be, for example, plastic elements that are connected to the wire basket 51 via, for example, screw or snap-in connections. In the presentation of the FIG. 1b only one of the side frames 52 is visible. On the opposite side of the wire basket 51 to the visible side frame 52 mirror-image side frame is provided.

In the lower region of the side frames 52, two intersecting scissors levers 53, 54 are arranged. At the point of intersection of the two scissor levers 53, 54, these are rotatably connected to each other via a pivot joint 55, whereby a scissors mechanism is formed. The scissors lever 54 is rotatably mounted on the side frame 52 in a pivot point 54 ', whereas the scissor lever 53 is rotatably and horizontally slidably fixed to the side frame 52. For this purpose, a sliding guide 521 is formed on the side frame 52, which in the Figure 1c can be seen. In this slide guide 521, a bearing plate is slidably guided, on which the scissor lever 53 is rotatably mounted in a pivot point 53 '.

At the free lever arms of the scissor levers 53, 54 in each case two rollers 56 are arranged here. The outer of the rollers 56 are arranged substantially at the end of the scissor levers 53, 54 rotatably. These outer rollers 56 are also on raised wire basket 51 on the door 3. The inner of the rollers 56 take only in the lowered state of Crockery basket 5 load on. In this condition, however, they minimize the leverage forces acting on the scissors mechanism.

In the in FIG. 1b shown fully extended state of the lower dish rack 5 is this with a front in the extension direction portion of the scissors lever 53 at stop 31 at. For example, it can be provided that an axle bolt, on which the front wheel 56 is mounted, bears against the trough-like contact surface 32 of the stop 31. The trough shape of the abutment surface 32 prevents that in the lifting operation shown below, the free end of the scissor lever 53 - is raised - for example, in unfavorable load distribution in the crockery basket 51 - with. On the in the Figures 1a - 1c not visible side of the sliding and lifting mechanism are also provided additional means for fixing the free end of the scissor lever 53, in connection with the Figures 2-5 be explained in more detail.

After pulling out of the crockery basket 5 with the sliding and lifting mechanism this can, as in Figure 1c represented, are raised by pivoting the pivot lever 57. The pivot lever 57 is pivotally connected to the side frame 52 at the fulcrum 57 '. On the pivot lever 57, a longer free lever arm is formed, which is operated by the user, and a shorter lever arm, which is rotatably connected at its end with a toggle lever 58. The rotation takes place in a knee joint 59. The other end of the toggle lever 58 in turn is rotatably connected to the scissor lever 54 articulated.

By a pivoting movement of the pivot lever 57 of the scissors levers 53, 54 formed scissors mechanism is pushed apart and so the side frames 52 is raised to the wire basket 51. In Figure 1c the fully raised position is shown in which the wire basket 51 is preferably at the same height as the upper dish rack 4. In the fully raised position, the pivot lever 57 is pivoted so far back towards the body 2 of the dishwasher 1 that he when loading or unloading the wire basket 51 is not in the way.

Like from the Figure 1c can be seen, the knee joint 59 formed from the shorter lever arm of the pivot lever 57 and the toggle lever 58 assumes an overstretched position in which the knee joint is fixed by a stop in the position shown. The wire basket 51 remains accordingly in the illustrated upper position. Only when Vorschwenken the pivot lever 57, the knee joint 59 is moved back over the dead center and the Wire basket 51 is discharged by further pivoting the pivot lever 57 again.

The stop, which holds the knee joint 59 in the illustrated overstretched position, may be disposed on various elements of the knee joint 59. For example, a stop in the region of the knee joint 59 may be formed on the corresponding ends of the pivoting lever 57 or the toggle lever 58. It is additionally or alternatively also conceivable to provide on the side frame 2 a stop on which the pivot lever 57 abuts.

The aspect ratio of the actuated lever arm of the pivot lever 57 and the lever arm connected to the toggle lever 58, as well as the articulation point of the toggle lever 58 on the scissor lever 54 cause a force transmission, which facilitates a lifting of the wire basket 51.

In the Figure 1c Furthermore, a arranged between the scissor lever 53 and the toggle lever 58 energy storage 60 can be seen, for example, designed as a tension spring. On the one hand, this energy store 60 holds the knee lever 58 in the illustrated position, in which the knee joint 59 is overstretched. On the other hand, the energy storage 60 supports the actuation of the lifting mechanism, in particular in the initial phase of the lifting. In an already partially raised state, the lever ratios of the pivot lever 57 and the toggle lever 58 with respect to the raising of the dish rack 51 cheaper. In this area, the support from the energy storage device 60 decreases. Advantageously, the leverage of the lifting mechanism and the energy storage 60 may be designed so that over the entire pivoting range of the pivot lever 57 as uniform as possible power requirement when lifting the wire basket 51 results.

In the FIGS. 2a . 3a and 4a in each case an isometric drawing of the crockery basket 5 is shown with the sliding and lifting mechanism. For the sake of clarity, the appliance door 3 is not completely, but only partially shown in the areas of the front rollers 56.

In the FIG. 2a is the lowered state of the wire basket 51 reproduced in the FIG. 3a a partly raised condition and in the FIG. 4a the fully raised state in which the wire basket 51 is in the upper position and in which the knee joint 59 is engaged (overstretched).

From the FIGS. 2a . 3a and 4a In particular, it can also be seen that on each side of the wire basket 51, a substantially mirror-inverted scissors mechanism with knee joint 59 and pivot lever 57 is arranged. The two pivot levers 57 are connected to each other at its free end via a transverse bow handle 61, so that both sides of the sliding and lifting mechanism are moved synchronously. Furthermore, in the FIGS. 2b . 3b and 4b the track for the rollers 56 visible and designated by the reference numeral 30.

Differently on the two sides of the stop 31 is formed. The right in the figures stop is designed as this in the side view of FIGS. 1 and 2 can be seen. The left-hand stop in each of the figures has an additional securing mechanism which securely fixes the free end of the scissor lever 53 to the stop 31 when the wire basket 51 is raised. This additional safety mechanism is in the enlargements of the respective stop area in the FIGS. 2b . 3b and 4b shown in more detail and will be explained below. It should be noted that such a securing mechanism as in this case may be formed only on one of the two sides of the dish rack 5 with sliding and lifting mechanism or on both sides.

The additional security is achieved here by the free end of the scissor lever 53 via the bearing point on which the front wheel 56 is mounted, is extended in the form of a tab 531. In the transition region between the scissor lever 53 and the tab 531, the front wheel 56 is mounted on a bearing pin 533. This bearing pin 533 is for example in the FIGS. 3b and 4b to recognize. At the front end of the tab 531, a securing bolt 532 is fastened, for example, riveted to the tab 531. From the bolt 532 is in the FIGS. 2b . 3b and 4b only the attachment in the tab 531 visible. Towards the opposite side, the bolt 532 protrudes from the tab 531. With this projecting part of the bolt 532 moves when approaching the scissors lever 53 to the stop 31 in a guide cam 33 which is recessed from the stop 31. The guide curve 33 has a shape which corresponds approximately to that of an angle hook. In its upper area, it is substantially straight, with the front end of the straight section (in the FIGS. 2b . 3b and 4b on the left side) is followed by a circularly curved and downwardly pointing section.

Upon complete retraction of the bolt 532 in the upper straight portion of the guide cam 33 and the axle pin 533 abuts against a stop surface on the stopper 31. This stop surface corresponds to the stop surface 32 of the in the FIG. 1a visible stop.

After this stop position is reached, the pivot lever 57 is actuated and raised the scissors mechanism for lifting the wire basket 51. Due to this mounting and the associated pivoting of the scissor lever 53, the pin 532 dives into the curved, downwardly facing portion of the guide cam 33. In this position, for example, in the FIGS. 3b can be seen, the bolt 532 can not be moved horizontally. At the same time, in this position, the axle pin 533 can not move upwards, since it is overlapped by sections of the stopper 31. Accordingly, only one rotation about the axle pin 533 can take place in this position. A translational movement of the axle pin 533 is prevented. The scissor lever 53 is thus rotatably fixed in the stop 31.

FIG. 4b Finally, the arrangement in the maximum pivotal position of the scissor lever 53rd

In the FIGS. 5a and 5b is the position of the sliding and lifting mechanism for in the FIGS. 2a and 2b shown state shown again in a sectional drawing.

In particular in FIG. 5b is at the end of the track 30, shortly before reaching the stop position of the last wheel 56, an increase 34 in the track 30 recognizable. This increase 34 must be overcome when starting or leaving the stop 31. In this case, the height movement, which experiences the tab 531 when driving over the increase 34, taken into account in the guide cam 33.

The increase 34 represents an additional backflow prevention, which already intervenes when the pivot lever 57 is not yet pivoted out of its basic position, the wire basket 51 is therefore still in the fully lowered position.

reference numeral

1

dishwasher

2

corpus

21

Side wall

3

door

30

career

31

attack

32

stop surface

33

guide curve

34

increase

4

dish rack

5

Crockery basket with sliding and lifting mechanism

51

wire basket

52

Drawer side

521

sliding guide

53, 54

crossbars

53 ', 54'

pivot point

55

scissor joint

56

caster

57

pivoting lever

58

toggle

59

knee

60

energy storage

61

bow handle

Claims (13)

1. A sliding and lifting mechanism of a shelf of an item of furniture or household device having a scissors mechanism for pulling the shelf out of a body of the item of furniture or household device and for raising the shelf, wherein the sliding and lifting mechanism has a toggle joint (59), which is coupled to the scissors mechanism and locks the shelf in a raised position, wherein the toggle joint (59) is formed by a pivot lever (57) and a toggle lever (58) and assumes a hyperextended position, in which the toggle joint is fixed by a stop if the shelf is in a raised position, and wherein the scissors mechanism is formed by at least two crossed scissors levers (53, 54), which are rotatably connected to one another, and which are each connected in a rotatable or rotatable and displaceable manner to the shelf at one end, characterized in that the pivot lever (57) is rotatably connected to the shelf so it is pivotable by a user, and the toggle lever (58) is coupled to the scissors mechanism by being linked to one of the scissors levers (53, 54).
2. The sliding and lifting mechanism according to Claim 1, wherein the scissors levers (53, 54) each have at least one roller (56) on free ends.
3. The sliding and lifting mechanism according to Claim 1 or 2, wherein an energy store (60) is coupled to the scissors mechanism.
4. The sliding and lifting mechanism according to Claim 3, wherein the energy store (60) is a compression spring, which is connected to at least one of the scissors levers (53, 54).
5. The sliding and lifting mechanism according to Claim 4, wherein the compression spring is connected to the toggle lever (58) or the pivot lever (57).
6. The sliding and lifting mechanism according to any one of Claims 1 to 5, wherein a scissors mechanism having toggle joint (59) is arranged on each of two opposite sides of the shelf.
7. The sliding and lifting mechanism according to Claims 6, wherein each of the toggle joints (59) has a pivot lever, wherein the free ends of the pivot levers (57) which are pivotable by the user are connected to one another by a common bow handle (61).
8. An item of furniture or household device having a body (2) and a shelf having a sliding and lifting mechanism, wherein the shelf can be pulled out and raised from the furniture body via the sliding and lifting mechanism, characterized in that the sliding and lifting mechanism is designed according to any one of Claims 1 to 7.
9. A household device, in particular a dishwasher (1), according to Claim 8, having a device door (3), which has at least one, preferably two runways (30) for rollers (56) of the sliding and lifting mechanism.
10. The household device according to Claim 9, wherein a stop (31) for the sliding and lifting mechanism is formed on the device door (3) at the end of the at least one runway (30).
11. The household device according to Claim 10, wherein the sliding and lifting mechanism engages in the stop (31) in an at least partially raised state so that it is rotatably connected to the stop (31).
12. The household device according to Claim 11, wherein a protruding pin (532), which engages in a curved guide curve (33) formed in the stop (31), is arranged on a scissors lever (53) of the scissors mechanism of the sliding and lifting mechanism.
13. The household device according to any one of Claims 8 to 12, designed as a dishwasher (1), wherein the shelf is a dish basket (5).

Images