EP3955773B1 - Retraction device for a movable part - Google Patents

Description

The present invention relates to a retraction device for a movable part, in particular for a furniture part, with a lever rotatably mounted on a housing, which can be coupled to the movable part in an angular range between two end positions in order to brake or accelerate the movable part, wherein the Lever is pre-stored into an end position via an energy accumulator, the lever being articulated with a connecting element guided along a guide track formed on the housing, the guide path being linear and the energy accumulator being connected to the connecting element on the side facing away from the lever.

From the DE 10 2012 111 551 A1 a pull-out guide with a damping device is known, in which a driver that can be coupled to the pull-out guide is linearly guided on a housing, the driver transmitting damping forces of a linear pressure damper via a rotatably mounted lever. In order to have good leverage, the distance between the pressure damper and the driver must be comparatively large.

The EP 1 816 927 discloses a drive device for a pull-out guide, in which a tilting segment can either be moved along a guide track with an arcuate end section or is mounted rotatably about an axis. In both cases there is the problem that the tilting segment, which is prestressed by a force accumulator, releases the forces on a driver quite abruptly, which is noticeable to the user when moving the movable furniture part. This also shows a similar tilting device for holding a drawer GB 1,117,071 .

DE 10 2013 103989 A1 discloses a locking device for furniture according to the preamble of claim 1.

It is therefore the object of the present invention to create a retraction device which, with a compact design, enables a smoother transition between a decoupled position and a coupled position of a movable part.

This task is achieved with a retraction device with the features of claim 1.

In the retraction device according to the invention, a rotatably mounted lever is provided which has a predetermined angular range between two End positions can be coupled to a movable part, the lever being articulated with a connecting element guided along a guide track. As a result, force can be transmitted to the lever via the connecting element, in particular through the energy storage and optionally a damper. This enables the coupling between the linearly acting energy storage and the rotatably mounted lever.

When the rotatably mounted lever moves from a first end position to a second end position, the energy storage preferably passes through a maximum in terms of spring force. The rotatably mounted lever can thus be held in an end position by the tensioned energy storage when a dead center is exceeded. The dead center is the point at which the energy storage exerts the greatest force on the rotatable lever. If this is exceeded, the direction of action of the energy storage on the rotatable lever changes. The rotatable lever is thus prestressed in a first end position in a first direction of rotation by the energy accumulator and in an opposite second end position it is prestressed in the opposite second direction of rotation. This ensures a stable fixation of the rotatable lever and thus also the movable part coupled to it in the respective end position.

In a further embodiment, the lever of the retraction device can be decoupled from the movable part in both end positions. This means that, for example, an end position of a drawer can be specified by other stops and the retraction device only serves to brake the drawer. This enables the elimination of slippage between the rails of a drawer slide.

In an embodiment according to the invention, the energy storage is connected to the connecting element on the side facing away from the lever. As a result, the connecting element and the energy storage can be arranged adjacently, which leads to a compact design.

In an embodiment according to the invention, the lever is rotatably mounted on a housing on which the guide track for the connecting element is formed. According to the invention, the guideway only runs linearly. The connecting element can be connected in an articulated manner to a carriage guided in the guide track. The connecting element can, for example, be designed as a rod which can be moved together with the carriage on one side and is connected in an articulated manner to the lever on the opposite side. In a one-piece design of the carriage and connecting element, the connecting element can also have a molded-on bearing element, for example can be moved and rotated in the guideway using a pin.

In a preferred embodiment, a damper is provided which brakes the movement of the lever towards an end position. The damper can be connected to the connecting element on the side facing away from the lever, so that the damper and the connecting element are arranged adjacent to one another.

According to the invention, the lever can be moved over an angular range between the end positions of 60° and 120° in order to be coupled to the movable part. The lever can be coupled, for example, by the lever having a groove-shaped or slot-shaped receptacle into which a projection or pin of the movable part engages over this angular range. If the movable part is guided linearly, the relationship between the rotary movement of the lever and the linear movement of the movable part changes, so that when the movable part is released, the forces occur less abruptly than if a driver preloaded by a force accumulator linearly along a guide track with a angled end section is guided.

The retraction device according to the invention is preferably used in pull-out runners such as those used for furniture or household appliances. The retraction device can also be used for sliding doors or other movable components.

Figur 1

eine perspektivische Ansicht einer erfindungsgemäßen Einzugsvorrichtung;

Figur 2

eine perspektivische Explosionsdarstellung der Einzugsvorrichtung der Figur 1;

Figuren 3A bis 3E

mehrere Ansichten der Einzugsvorrichtung der Figur 1 ohne Gehäusedeckel in unterschiedlichen Positionen;

Figuren 4A bis 4D

mehrere Ansichten der erfindungsgemäßen Einzugsvorrichtung mit einer Auszugsführung;

Figur 5

eine perspektivische Ansicht einer modifizierten Ausführungsform einer erfindungsgemäßen Einzugsvorrichtung;

Figur 6

eine perspektivische Explosionsdarstellung der Einzugsvorrichtung der Figur 5;

Figuren 7A bis 7E

mehrere Ansichten der Einzugsvorrichtung der Figur 5 ohne Gehäusedeckel in unterschiedlichen Positionen;

Figur 8

ein Diagramm zum Kraftverlauf bei einer Einzugsvorrichtung mit einem linear geführten Mitnehmer, und

Figur 9

ein Diagramm zum Kraftverlauf einer erfindungsgemäßen Einzugsvorrichtung.

The invention is explained in more detail below using an exemplary embodiment with reference to the accompanying drawings. Show it:

Figure 1

a perspective view of a retraction device according to the invention;

Figure 2

a perspective exploded view of the retraction device Figure 1 ;

Figures 3A to 3E

several views of the feed device Figure 1 without housing cover in different positions;

Figures 4A to 4D

several views of the pull-in device according to the invention with a pull-out guide;

Figure 5

a perspective view of a modified embodiment of a retraction device according to the invention;

Figure 6

a perspective exploded view of the retraction device Figure 5 ;

Figures 7A to 7E

several views of the feed device Figure 5 without housing cover in different positions;

Figure 8

a diagram of the force curve in a pull-in device with a linearly guided driver, and

Figure 9

a diagram of the force curve of a retraction device according to the invention.

A retraction device 1 comprises a housing 2 on which a lever 3 is rotatably mounted about an axis 4. The lever 3 comprises a receptacle 31 into which a movable part 5 can be inserted, which is designed as a pin or projection which engages in the receptacle on the rotatable lever 3 and can be moved together with it. The movable part 5 is displaceably arranged on the receptacle of the rotatably mounted lever 3.

The retraction device 1 is shown in detail in the exploded view Figure 2 shown. The housing 2 includes a housing part 21 and a housing cover 20, which form a cavity in the assembled position. An energy storage device 7 in the form of a spring, in particular a helical spring, is arranged in the housing 2 and is fixed with a first end 70 to a wall in the housing 2 at a receptacle 22. The energy accumulator 7 is connected at the opposite end 71 to a connecting element 6, which is designed as a rod and has a holder 61 at one end in which the end 71 of the energy accumulator 7 can be fixed. The connecting element 6 is articulated at the opposite end to the rotatably mounted lever 3, for which purpose a pin 60 on the connecting element 6 engages in an opening 32 on the lever 3, which is arranged at a distance from the axis 4 of the lever 3. The axis 4 of the lever 3 corresponds to its axis of rotation, which results from an opening 30 on the lever 3 and a pin 25 on the housing part 21, one end of the lever 3 protruding laterally from the housing 2 in the area of a recess 23 in the housing 2 , around to accommodate the movable part 5 over a predetermined angular range, according to the invention between 60° and 120°.

The retraction device 1 further comprises a damper 8, which is designed as a linear pressure damper, for example as a fluid damper, which comprises a cylindrical housing 80 on which a piston rod 81 connected to a piston is slidably mounted. The damper 8 can be fixed to a receptacle 24 of the housing 2, the piston rod 81 being connected to a slide 9 via a connecting element 82. For this purpose, the carriage 9 has a receptacle 91 into which an end section of the connecting element 82 is inserted. The carriage 9 further comprises an opening 90 into which a bolt 62 of the connecting element 6 is inserted, so that the connecting element 6 is mounted in an articulated manner on the carriage 9. The carriage 9 is guided in a linear guide track 26 on the lower housing part 21.

In Figure 3A the retraction device 1 is shown with a tensioned energy storage device 7, which is arranged essentially parallel and adjacent to the connecting element 6. The movable part 5 was moved linearly, essentially parallel to a longitudinal direction of the housing 2, and independently of the lever 3 towards the retraction device and is located on the rotatably mounted lever 3 before being picked up, while the lever 3 is held in an end position. If the movable part 5, which is coupled, for example, to a movable furniture part, such as a drawer or a sliding door, is now to be moved further into an end position, for example the maximum opening position or the closed position, a relative movement takes place between the movable part 5 and the Housing 2 instead, like this comparison Figures 3B and 3C shows. In Figure 3C the lever 3 was rotated slightly counterclockwise, for example between 1° and 5°, so that the connecting element 6 was also pivoted and is now no longer aligned parallel to the energy accumulator 7. A dead center was exceeded, i.e. the point at which the energy storage 7 is maximally tensioned. This leads to an unlocking of the unit consisting of lever 3, connecting element 6 and energy accumulator 7, so that the energy accumulator 7 can now transmit a force to the lever 3 via the connecting element 6 in order to rotate it in a counterclockwise direction of rotation.

In Figure 3D an intermediate position is shown in which the movable part 5 has been displaced radially inwards in the receptacle on the lever 3 and is moved over the lever 3. This movement takes place via the energy storage 7 and the connecting element 6, wherein the connecting element 6 is moved via the carriage 9 along the guide track 26. The movement of the lever 3 takes place up to an end position in which the movable part 5 is held. In Figure 3E the movable part 5 is shown in its end position, whereby it is still arranged in the receptacle of the lever 3.

The movable part 5 can initiate extension from the retraction device 1 in the event of an externally applied opposing force movement, for example a closing movement of a push element, such as a drawer, exerted by the user. The energy accumulator 7 is tensioned by a corresponding counterclockwise movement of the lever 3 until the lever 3 exceeds the dead center and then in the opposite first end position Figure 3B is fixed. A decoupling then takes place between the movable part 5 and the receptacle 31 on the lever 3 according to Figure 3B and the movable part 5 can again be independent of the lever 3, as in Figure 3A shown, moved.

The movement of the rotatable lever 3 can be braked by the damper 8, which can be designed as a compression and/or tension damper depending on the damping direction. Optionally, the damper 8 can also be omitted.

In Figure 4A the pull-in device 1 is shown together with a pull-out guide 10, which has a stationary rail 11, which can be fixed, for example, to a furniture body or a household appliance. On the stationary rail 11, a middle rail 12 is movably mounted, on which a further movable rail 13 is arranged, on which a push element, such as a drawer, or another component can be fixed. The pull-out guide 10 can only include two rails or more than three rails instead of three rails. In this embodiment shown, the retraction device 1 is arranged on the movable rail 13 and the part 5, which is movable relative to the retraction device 1, is connected to the stationary rail 11 via a schematically shown connecting means 14.

The pull-out guide 10 is located in the in Figure 4A Position shown shortly before reaching its end position, the energy accumulator 7 being tensioned, and the lever 3 being in the in Figure 3A shown first end position. If the rail 13 moves further into its end position, further away from the stationary rail 11, the movable part 5 couples to the lever 3 and moves thus the rotatably mounted lever 3 out of its end position, which leads to the connecting element 6 being moved with the lever 3 beyond the dead center, so that the energy storage device 7 then drives the connecting element 6 and the lever 3. In Figure 4C a middle position is shown in which the retraction device has been unlocked and the energy storage drives the connecting element 6, whereby the lever 3 is supported on the movable part 5 and thereby moves the rail 13 towards the end position.

The movement of the lever 3 relative to the movable part 5 continues until the in Figure 4D Position shown is reached, which is essentially the Figure 3E corresponds. The rail 13 has reached its end position and is held in position via the lever 3 and the part 5 coupled to it.

To extend from the end position, here inserting the pull-out guide 10, the movement sequence is reversed, that is, the pull-in device 1 is moved with the rail 13 in the direction of the stationary rail 11, and by coupling the movable part 5 with the receptacle of the rotatably mounted lever 3 , the energy accumulator 7 is then tensioned via the rotatable mounted lever 3 and the connecting element 6 until the dead center is exceeded and the in the Figures 4B and 3B position shown is reached. Then the movable part 5 can be removed from the receptacle of the lever 3, so that the retraction device 1 with the rail 13 can be moved independently of the movable part 5.

In Figure 5 A modified embodiment of a retraction device is shown, with the same components being designated by the same reference numbers. A lever 3 rotatably mounted on a housing 2 includes a receptacle 31 for a movable part 5. The movable part 5 is designed as a cylindrical bolt and includes a flat 50, which facilitates the engagement of the movable part 5 on the lever 3.

The feed device 1 of the Figure 5 is in detail in the exploded view Figure 6 shown. The housing 2 comprises a shell-shaped housing part 21 and a housing cover 20, which surround a cavity in which an energy accumulator 7 is arranged in the form of a spring. A first end 70 of the energy accumulator 7 is fixed to a receptacle 22 and an opposite end 71 is connected to a holder 43 on a connecting part 40. The connecting part 40 is guided essentially linearly in a channel-shaped receptacle on the housing 2.

The connecting part 40 has a pin 41 which engages in an opening 42 on the connecting element 6 designed as a rod and connects the two in an articulated manner. The connecting element 6 has a further opening 44, which is articulated to a pin 32 'on the lever 3. The lever 3 is rotatably mounted around the pin 25.

Furthermore, a damper 8 with a housing 80 and a piston rod 81 movable relative to the housing is present. The damper 8 is fixed in a receptacle 24 of the housing 2 and the piston rod 81 is coupled to the connecting part 40.

In the Figures 7A to 7E is the retraction device Figure 5 shown in different positions. The movement sequence essentially corresponds to that Figures 3A to 3E , however, in the second end position there is no locking of the movable part 5 on the lever 3. Here, in both end positions of the lever 3, there is a decoupling between the movable part 5 and the lever 3. If the retraction device is used on a pull-out guide 10, this occurs in the position of Figure 7D not to a stop by the retraction device 1, but to a decoupling. The pull-out guide 10 is then only stopped by other end stops. For example, slip can also be pulled out of the pull-out guide 10 without being hindered by or damaging the pull-in device 1. Furthermore, the flattening 50 on the movable part 5 ensures better threading into the receptacle 31 of the lever 3.

In Figure 8 a diagram of a retraction device is shown with a linearly movable driver, which is movable along a guide track with an angled end section and is biased by an energy storage device. The force of the energy accumulator on the driver and the path when unlocking the retraction device are shown, whereby the diagram must be read from right to left. On the right side, the movable part, for example the drawer, is in its open end position. The force from the energy accumulator on the linearly guided driver initially increases when closing and then drops comparatively abruptly, for example over a distance of 9 mm. In this area, the driver or the tilting segment tilts and releases the movable part. This occurs comparatively abruptly over a short distance.

In Figure 9 a force-displacement diagram of a retraction device 1 according to the invention is shown. Here, too, a drawer is initially assumed to be in the open end position, starting from the right side. When closing, the partially relaxed energy storage is tensioned again, with the force via the connecting element 6 and the lever 3 on the movable part 5 increasing and reaching a maximum. However, the distance between the maximum force of the energy accumulator on the movable part 5 up to the decoupling of the movable part 5 from the lever 3 takes place over a significantly longer distance, for example in a range between 15 mm to 40 mm, preferably 17 mm to 25 mm , so that the power transfer is less abrupt for the user, which is more comfortable to use. The maximum force set by the energy storage device was chosen to be approximately the same at 20 N.

Reference symbol list

1

Feeding device

2

Housing

3

lever

4

axis

5

Part

6

connecting element

7

Energy storage

8th

mute

9

Sleds

10

Excerpt guide

11

stationary rail

12

rail

13

rail

14

lanyard

20

Housing cover

21

Housing part

22

Recording

23

recess

24

Recording

25

Cones

26

guideway

30

opening

31

Recording

32

opening

32`

Cones

40

connecting part

41

Cones

42

opening

43

holder

44

opening

50

flattening

60

Cones

61

holder

62

bolt

70

End

71

End

80

Housing

81

Piston rod

82

connecting element

90

opening

91

Recording

Claims (10)

1. A retraction device (1) for a movable part (5), in particular for a furniture part, having a rotatably mounted lever (3) which is rotatably mounted on a housing (2), which can be coupled to the movable part (5) in an angle range between two end positions to decelerate or accelerate the movable part, wherein the lever (3) is prestored via a force accumulator (7) in one end position, wherein the lever (3) is connected in an articulated manner to a connecting element (6) guided along a guide path (26), wherein the guide path (26) is formed in a linear manner and the force accumulator (7) is connected to the connecting element (6) on the side facing away from the lever (3), characterized in that the angle range between the two end positions of the lever (3) is between 60° and 120°.
2. The retraction device according to Claim 1, characterized in that during the movement of the rotatably mounted lever (3) from a first end position into the second end position, the force accumulator (7) passes through a maximum with respect to the spring force.
3. The retraction device according to Claim 1 or 2, characterized in that the rotatably mounted lever (3) is held in an end position by overcoming a dead center by way of the tensioned force accumulator (7).
4. The retraction device according to any one of the preceding claims, characterized in that the connecting element (6) is connected in an articulated manner to a carriage (9) guided in the guide path (26).
5. The retraction device according to any one of the preceding claims, characterized in that the connecting element (6) is formed as a rod.
6. The retraction device according to any one of the preceding claims, characterized in that a damper (8) is provided, which decelerates the movement of the lever (3) toward an end position.
7. The retraction device according to Claim 6, characterized in that the damper (8) is connected with the end facing away from the lever (3) to the connecting element (6).
8. The retraction device according to any one of the preceding claims, characterized in that the lever (3) is decoupled in both end positions from the movable part (5).
9. A pullout guide (10) having a stationary rail (11) and at least one movable rail (12, 13), characterized in that the movable rail (12, 13) is fixable in an end position via a retraction device (1) according to any one of the preceding claims.
10. A pullout guide (10) having a stationary rail (11) and at least one movable rail (12, 13), characterized in that a movable rail (12, 13) is moved in the direction of an end position via a retraction device (1) according to any one of the preceding claims and is released again before reaching the end position.

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