WO2018210565A1

WO2018210565A1 - Lifting mechanism for a shelf of a piece of furniture or domestic appliance, piece of furniture or domestic appliance, and drawer

Info

Publication number: WO2018210565A1
Application number: PCT/EP2018/061168
Authority: WO
Inventors: David Krüger; Arnold GURR
Original assignee: Paul Hettich Gmbh & Co. Kg
Priority date: 2017-05-15
Filing date: 2018-05-02
Publication date: 2018-11-22
Also published as: DE102017110498A1

Abstract

The invention relates to a lifting mechanism (1) for a shelf (3) of a piece of furniture or domestic appliance, having a shearing mechanism with at least two crossed shearing levers (5, 6) which are connected together in a rotatable manner for lifting and lowering the shelf (3). A first end (52) of a first shearing lever (5) is arranged on a base (2) in a rotatable and movable manner, and a first end (62) of a second shearing lever (6) is arranged on the base (2) in a stationary and rotatable manner. A second end (53) of the first shearing lever (5) is arranged on the shelf (3) in a stationary and rotatable manner, and a second end (63) of the second shearing lever (6) is arranged on the shelf (3) in a rotatable and movable manner. The lifting mechanism also has a pivot lever (4), which is coupled to the shearing mechanism and which can be pivoted in a lifting direction (A) in order to lift the shelf (3) from a lower end position into an upper end position and in a lowering direction (S) in order to lower the shelf from an upper end position into a lower end position, and at least one energy storage element (7), which is coupled to the shearing mechanism. The pivot lever (4) is connected to the first shearing lever (5) in a pivotal manner, and the shearing lever (5) has a section (42) which extends from the pivotal connection of the pivot lever (4) to the first shearing lever (5) at an angle to the main longitudinal direction (LS) of the shearing lever (5). A first end (73) of the at least one energy storage element (7) is rotatably secured to the first shearing lever (5), and a second end (74) is rotatably secured to the section (42) of the pivot lever (4). When the pivot lever (4) is positioned at the dead center of the lifting movement of the shelf (3), a torque (M) which counteracts a return pivot of the shearing lever (4) in the lowering direction (S) acts on the pivot lever (4), or the energy storage element (7) acts as a self-closing mechanism in the region of the lower end position when the shelf (3) is lowered. The invention further relates to a piece of furniture or domestic appliance and a drawer.

Description

Lifting mechanism of a shelf of a piece of furniture or household appliance, furniture or household appliance and drawer

The present invention relates to a lifting mechanism of a shelf of a piece of furniture or household appliance according to the preamble of claim 1 and a furniture or household appliance or a drawer. A generic lifting mechanism with a tray is known for example from DE 10 2015 102 500 A1. Known from this document lifting mechanism has a scissors mechanism with two crossed and rotatably interconnected scissor levers for raising and lowering the tray.

For manual lifting and lowering of the tray is a pivot lever.

A disadvantage of the lifting systems of the prior art is that for secure locking of the lifting system or the tray in an upper end position, the scissors mechanism must be pivoted beyond a so-called Hubwegtotpunkt out or an additional locking element is needed.

As Hubwegtotpunkt while a position of the pivot lever is referred to, in which the attached to the scissors mechanism storage is in a maximum raised position and conditionally pivoted by Weiterverschwenken of the pivot lever in the lifting direction, the shelf by the scissor mechanism is slightly lowered again. Object of the present invention is to further develop a lifting mechanism to the effect that the pivotal movement of the pivot lever and associated with this scissors mechanism is further optimized.

This object is achieved by a lifting mechanism of a shelf of a piece of furniture or household appliance with the features of claim 1 and claim 2.

The object is further achieved by a furniture or household appliance or a drawer with the features of claims 10 and 11. The lifting mechanism according to the invention has a scissors mechanism with at least two crossed and rotatably interconnected scissor levers for raising and lowering the tray.

A first scissor lever is rotatable and displaceable at a first end and a second scissor lever at a first end fixed and rotatably arranged on a base. A second end of the first scissor lever is fixed and rotatable, and a second end of the second scissor lever is rotatably and slidably disposed on the tray.

A coupled to the scissors mechanism pivoting lever of the lifting mechanism is pivotally for lifting the tray from a lower end position to an upper end position in a lifting direction and for lowering from an upper end position to a lower end position in a lowering direction.

The lifting mechanism furthermore has at least one energy store coupled to the scissors mechanism. The pivot lever is pivotally connected to the first scissor lever, for example in the region of a side arm or a planar element, wherein the scissor lever has an angled from the pivotal connection of the pivot lever with the side arm to its main longitudinal direction of the scissor lever section.

The at least one energy store is rotatably mounted with a first end on the first scissor lever and with a second end on the portion of the pivot lever, wherein in a position of the pivot lever at the dead center of the lifting movement of the tray acts a pivoting back of the scissor lever in the lowering direction counteracting torque on the pivot lever.

With such a lifting mechanism, a secured upper end position is already reached at Hubwegtotpunkt. A pivoting movement of the pivot lever on this Hubwegtotpunkt addition is therefore no longer necessary to achieve a secure upper end position. Also, this can be dispensed with the attachment of an additional locking element.

The torque acting on the pivot lever in this dead center of the lifting movement, which is caused by the energy storage, can be extremely be small, since in principle at this point any small force would be sufficient to keep the lifting mechanism in this upper end position.

By thus skillful arrangement of the energy storage, it is possible to design the energy storage so that before reaching the upper end position of the energy storage, which also serves to support the lifting movement, can develop a relatively weak effect in this area to achieve a gentle stop on reaching to effect the upper end position.

This arrangement of the energy storage additionally or alternatively, a self-closing of the lifting mechanism is achieved in the lower end position.

Advantageous embodiments of the invention are the subject of the subclaims.

According to an advantageous embodiment of the energy storage is designed as a tension spring. A design as a compression spring, as a gas spring or as Gaszugfeder is also possible.

According to a further preferred embodiment, the lifting mechanism has at least one damping element coupled to the scissors mechanism. According to an advantageous embodiment of the invention, the damping element is designed as acting in the compression direction damping element and the first end on the second scissor lever, for example at the free end of a side branch of a side arm or on a flat area or at the transition of a side arm in a main arm of the second ten Scissor lever, rotatably mounted.

Characterized both a damping of the lifting movement in the upper end position and a lowering movement is realized in a lower end position with a single single-acting damping element. Thus, a damped upper end position and a damped Selbsteinzug is realized in the lower end position. Overall, it is particularly advantageous if the bearings of energy storage and damping element in the upper and lower end position are not in the force action lines of the scissors levers. For easy operation of the lifting mechanism, a handle is attached according to a preferred embodiment of a free, pivotable by a user end of the pivot lever.

To stabilize the tray, a scissors mechanism is arranged according to a further preferred embodiment variant on each of two opposite sides of the tray.

The furniture or household appliance is characterized by a lifting mechanism as described above.

The drawer, with a lifting mechanism with a tray is characterized by a lifting mechanism as described above.

Hereinafter, preferred embodiments of the invention are explained in detail with reference to the accompanying drawings. Show it :

Figure 1 a) is a perspective view of an embodiment of a

Lifting mechanism with attached tray in a lower end position,

FIG. 1 b) shows a side view of the lifting mechanism according to FIG. 1 a),

characters

2a and 2b) Figures 1 a) and 1 b) corresponding representations of the lifting mechanism of Figure 1 in a partially raised position of the tray,

characters

3a and 3b) Figures 1 a) and 1 b) corresponding representations of the lifting mechanism in the upper end position and partially tensioned energy storage,

characters 4a) to 6b) Figures 1 a) to 3b) corresponding representations of a variant of a lifting mechanism with energy storage and a damping element for damping the pivoting in the upper and lower end position and

characters

7a) to 9b) to Figures 4a) to 6b) corresponding representations of another embodiment of a lifting mechanism with an energy storage and two separate damping elements for damped Einschwenkung in the upper and lower end position.

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 lifting mechanism, the scissors lever, the pivoting lever, the damping element, the tray and like. These terms are not meant to be limiting, that is to say, by different working positions or the mirror-symmetrical design or the like, these references may change.

In Fig. 1 b is designated by the reference numeral 1 a total of a variant of a lifting mechanism according to the invention. The lifting mechanism 1 has, as exemplified in all of the figures, a scissor mechanism with at least two crossed and rotatably interconnected scissor levers 5, 6, which serve to raise and lower a tray 3.

The tray 3 can, as shown for example in FIGS. 1 a) and 1 b), be designed as a container. It is also conceivable to design the tray 3 as a basket, for example a dish rack in the case of the use of such a lifting mechanism 1 in a household appliance designed as a dishwasher or else as a tray.

As shown in all of the figures, a first shearing lever 5 is rotatably and slidably disposed on a base 2 at a first end 52.

A second scissor lever 6 is stationary at a first end 62 and rotatably disposed on this base 2. As a base 2 can, as shown by way of example in Fig. 2a), a bottom 21 serve with laterally mounted strips 22 in which a guide groove 23 serves to guide the first end 52 of the first scissor lever 5. It is also conceivable to form the base as a running rail of a rail system, which is movable with a mounted in a body of a piece of furniture or household appliance guide rail and with the tray 3 together with the lifting mechanism 1 from a carcase interior of the furniture or household appliance can be pushed out.

A second end 53 of the first scissor lever 5 is stationary and rotatably arranged on the tray 3. Accordingly, a second end 63 of the second scissor lever 6 is rotatably and slidably disposed on the tray 3. For displacement of the second end 63 of the second scissor lever 6, a guide groove 32 is formed in a side wall 31 of the tray 3, in which the second end 63 of the scissors lever 6 is held slidably received.

Instead of such a guide groove 32, it is also conceivable to form on the outside of the side wall 31, a guide rail or fasten.

The first scissors lever 5 and the second scissors lever 6 are pivotable relative to each other via a pivot 10 of a plane parallel to the side wall 31 of the tray.

To raise or lower this scissor mechanism is a pivot lever 4, which is coupled to the scissors mechanism. In this example, a handle 43 is present in the upper region of the pivot lever 4. The pivoting lever 4 is connected directly to the first scissor lever 5, in particular to a side arm 54 of the first scissor lever 5 or to a planar area, and via a knee joint 82 to the second scissor lever 6. This knee joint 82 is thereby formed by a pivot lever 4 rotatably mounted toggle lever 8 and a rotatably mounted thereto side arm 64 of the second scissor lever 6.

The side arm 64 of the second scissor lever 6 extends at an angle from a main arm 61 of the second scissor lever 6 in a range between the attached at the intersection between the scissor levers 5, 6 pivot 1 0 and the second end 63 of the second scissor lever. 6

At a first end of the toggle lever 8, the axis of rotation of the knee joint 82 is arranged. The second end 83 of the toggle lever 8 is pivotally connected to the pivot lever 4.

As can be seen in FIGS. 1 a) and 1 b), a side branch 65 branches off from the side arm 64 of the second scissor lever 6.

As shown in FIGS. 1 a) to 9 b), the lifting mechanism 1 furthermore has an energy store 7 coupled to the scissors mechanism.

The energy store 7 is rotatably mounted with a first end 71 on the first scissor lever 5 and with a second end 72 on the portion 42 of the pivot lever 4. By this positioning acts in a position of the pivot lever 4 at the dead center of the lifting movement of the tray 3 a pivoting back of the scissor lever 4 in the lowering S counteracting torque M on the pivot lever 4, as shown in Figures 3a) and 3b). Thus, a secured upper end position of the tray is already reached at Hubwegtotpunkt scissor mechanism. A pivoting movement of the pivot lever in lifting direction A beyond this Hubwegtotpunkt addition is thus no longer necessary to achieve a secure upper end position. In Figure 1 a) and 1 b), the lower end position of the tray 3 with the lifting mechanism 1 is shown. The energy storage 7 acts through the arrangement described above in the lowering S as Selbsteinzug in this lower end position. The energy storage 7 is preferably designed as a spring element, in particular as a tension spring.

As shown in FIGS. 4 a) to 6 b), the lifting mechanism 1 furthermore has at least one damping element 9 coupled to the scissors mechanism.

This damping element 9 is designed as a simple acting in the pulling direction or compression direction damping element. The damping element 9 is connected to a first end 93 on the side arm 64 of the second scissor lever 6 and rotatably attached at a second end to the bellcrank 8 so as to dampen lifting of the tray 3 from the lower end position shown in Figs. 4a) and 4b to the upper end position shown in Figs. 6a) and 6b).

The damping element 9 is preferably designed as acting in the pressure direction damping element. A first end 93 of this damping element 9 is rotatably mounted at a transition of the side arm 64 in a main arm 61 of the second scissor lever 6.

In this particular positioning of the first damping element 9, the damping element 9 can be used both for a damping of the lifting movement in the upper end position and for the lowering movement from the upper end position to the lower end position. In combination with the energy store 7, a damped, secured upper end position and a damped self-closing into the lower end position are realized.

In this arrangement, as shown in FIGS. 5a) and 5b), the damping element 9 is maximally deflected in an intermediate position of the scissors mechanism between the upper and lower end positions.

Accordingly, both the further pivoting of the scissor mechanism in the upper end position, shown in Figures 6a) and 6b), as well as the lowering movement in the lower end position shown in Figures 4a) and 4b), causes the damping plunger 92 of the damping element 9 is retracted into the damper housing 91 of the damping element 9.

This is a single-acting damping element 9 can be used in two ways.

Furthermore, FIGS. 7a) to 9b) show a second damping element 11 for effecting a damping of the lowering movement of the tray 3 into the lower end position, which is coupled to the scissors mechanism. In this case, a first end of this designed as a pressure damper second

Damper element 1 1 rotatably mounted near the first end 62 of the second scissor lever 6. The second end of the second damping element 1 1 is close to the arranged at the intersection of the scissor levers 5, 6 pivot 10 between the pivot 10 and the second end 53 of the first Scissors lever 5 rotatably mounted, so that when raising the tray 3 using the scissor mechanism, a plunger of the second damping element 1 1 is pulled out of a housing of the second damping element 1 1 without damping effect and when lowering the tray 3 in the lower end position while exerting a damping force is pushed back into the housing of the second damping element 9.

Reference Hub mechanism base

ground

strip

Guide groove storage

Side wall

Guide groove pivot lever

section

Handle first scissors lever

first end

second end

Side arm second scissor lever

main arm

second end

sidearm

Side branch energy storage

first end

second end toggle

knee

second end

damping element

damper housing

damping plunger 93 first end

94 second end

10 swivel

1 1 second damping element

A lifting direction

M torque

S lowering direction

Claims

claims

Lifting mechanism (1) a shelf (3) of a piece of furniture or household appliance, comprising

a scissor mechanism with at least two crossed and rotatably interconnected scissor levers (5, 6) for lifting and lowering the tray (3),

- wherein a first scissor lever (5) at a first end (52) rotatable and displaceable and a second scissor lever (6) at a first end (62) is fixed and rotatably arranged on a base (2),

- Wherein a second end (53) of the first scissor lever (5) stationary and rotatable and a second end (63) of the second scissor lever (6) is rotatably and slidably disposed on the tray (3),

- A pivoting lever (4) coupled to the scissors mechanism for raising the tray (3) from a lower end position to an upper end position in a lifting direction (A) and for lowering from an upper end position to a lower end position in a lowering direction (S) is pivotable,

at least one energy store (7) coupled to the scissor mechanism,

characterized in that

- The pivot lever (4) is pivotally connected to the first scissor lever (5),

- wherein the scissors lever (5) has a portion (42) extending at an angle from the pivotal connection of the pivoting lever (4) to the first scissor lever (5) to its main longitudinal direction (LS) of the scissor lever (5),

- wherein the at least one energy store (7) with a first end (73) on the first scissor lever (5) and with a second end (74) on the portion (42) of the pivot lever (4) is rotatably mounted,

- In a position of the pivot lever (4) at the dead center of the lifting movement of the tray (3) a pivoting back of the scissors lever (4) in the lowering direction (S) counteracting torque (M) acts on the pivot lever (4).

Lifting mechanism (1) a shelf (3) of a piece of furniture or household appliance, comprising a scissor mechanism with at least two crossed and rotatably interconnected scissor levers (5, 6) for lifting and lowering the tray (3),

- Wherein a first scissor lever (5) at a first end (52) rotatable and displaceable and a second scissors lever (6) at a first

End (62) fixed and rotatable on a base

(2) is arranged

- At least one coupled to the scissor mechanism energy storage

(7)

characterized in that

- The pivot lever (4) is pivotally connected to the first scissor lever (5),

- wherein the scissor lever (5) has an angle (42) extending from the pivotal connection of the pivoting lever (4) with the first scissor lever (5) to its main longitudinal direction (LS) of the scissor lever (5),

- wherein the at least one energy store (7) with a first end (73) on the first scissor lever (5) and with a second end (74) on

Section (42) of the pivot lever (4) is rotatably mounted

- Where the energy storage (7) when lowering the tray

(3) acts as a self-closing in the area of the lower end position.

Lifting mechanism according to claim 1 or 2, characterized in that the energy store (7) is designed as a tension spring.

Lifting mechanism according to one of the preceding claims, characterized in that the pivot lever

(4) directly to the first scissor lever (5) and via a knee joint (82) with the second scissor lever (6) is connected.

5. lifting mechanism according to claim 3, characterized in that the

Knee joint (82) of one of the pivot lever (4) rotatably mounted toggle lever (8) and a rotatably mounted thereto side arm (64) of the second scissor lever (6) is formed.

6. Lifting mechanism according to one of the preceding claims, characterized by at least one coupled to the scissor mechanism damping element (9).

7. lifting mechanism according to claim 6, characterized in that the

Damping element (9) as a pressure-direction single-acting damping element with the first end (93) on the second scissor lever (6), in particular in the region of a side arm (64) of the second scissor lever (6) is rotatably mounted.

8. lifting mechanism according to one of the preceding claims, characterized in that on each of two opposite sides of the tray (3) is arranged in each case a scissor mechanism.

9. lifting mechanism according to one of the preceding claims, characterized in that the base (2) is designed as a bottom or guide rail.

10. Furniture or household appliance having a body and a tray (4) with a lifting mechanism, wherein the tray (4) via the lifting mechanism can be raised and lowered, characterized in that the lifting mechanism is designed according to one of claims 1 to 9.

1 1. Drawer with a lifting mechanism with a tray (3), wherein the tray (3) via the lifting mechanism from the drawer is raised and lowered into this, characterized by at least one arranged in a receiving space, in particular on a bottom of the drawer lifting mechanism according to one of the claims 1 to 9.