EP4110138B1 - Pull-out guide - Google Patents

Description

The present invention relates to a pull-out guide with a guide rail that can be fixed to a furniture body, a middle rail that is movably mounted on the guide rail and a running rail that is movably mounted on the middle rail and on which a push element can be fixed, at least one support element being arranged between the running rail and the middle rail, which limits rearward lifting of the running rail when the running rail is moved in an extension direction when a tipping point is reached, the support element having a guide part and a support part adjacent thereto and the guide part of the support element being displaceably guided on a guide on the middle rail.

The EP 2 779 867 B1 discloses a pull-out guide for a drawer, in which a body rail, a middle rail and a drawer rail are provided, each of which is movably mounted on one another via rolling elements. Two support profiles are arranged on the middle rail as separate structural units, which work together with a rolling element to prevent the running rail from lifting off the middle rail when a tipping point is reached. However, installing additional support profiles requires considerable effort because they are welded to the center rail.

The US 2005/0231083 A1 discloses a pull-out guide in which a roller is fixed to the middle rail, which is gripped under by a running rail. As a result, during an extension movement, the roller can limit the lifting of the running rail in the rear area when a tipping point is reached, i.e. when the weight forces on the running rail cause lifting in the rear area. However, the rigid arrangement of the roller in the extension direction has the disadvantage that the support width at the tipping point can be of different lengths. The support width is the distance from the frontmost rolling element between the running rail and middle rail and the support roller in the extension direction. The support width varies as the running rail moves from the closed position to the maximum open position. The position of the tipping point cannot be determined by the manufacturer of the drawer runner, as it depends on the weight of the front panel and the load of the drawer. Therefore it can Especially with short pull-out runners, when a tipping point is reached and a small support width is reached, an abrupt tilting movement occurs on the running rail.

GB515899 , GB628939 and JPS4946933U disclose roller guides for rails that can be moved relative to one another.

EP 3 153 067 A1 discloses a pull-out guide with rolling elements between rails that can be moved relative to one another and can be locked to one another via a locking mechanism.

WO2015/052047 A1 discloses a pull-out guide with rolling element cages and a support element in the form of a roller.

It is therefore the object of the present invention to create a pull-out guide in which a sudden lowering of the running rail when the tipping point is reached is reduced.

This task is solved with a pull-out guide with the features of claim 1.

In the pull-out guide according to the invention, at least one support element is arranged on the middle rail, which limits rear lifting when the running rail moves in a pull-out direction when a tipping point is reached, the support element having a guide part and a support part adjacent thereto and the guide part of the support element being displaceable a guide on the middle rail. When the running rail moves in the extension direction, the support element is also moved in the extension direction on the middle rail. As a result, the support width, i.e. the distance between a front rolling element or a front roller between the running rail and the middle rail, and a contact surface on the support element with the running rail viewed in the pull-out direction, can be kept relatively large, for example more than 50mm, so that even with one Reaching the tipping point early prevents the running rail from suddenly lowering in the front area. The mobility of the support element can thus be used to increase the support width.

Preferably, the support element is held on the center rail so as to be displaceable in the pull-out direction along a guide in the form of a recess. This allows the support element to be moved relative to the center rail in order to increase the support width. This leads to a compact structure the support element engages in the recess of the center rail and is guided there, so that no additional space is necessary for the guidance.

The support element can be guided linearly along the middle rail, but a curved or inclined orientation in relation to the extension direction is also possible in order to counteract the lowering of the running rail in the front area.

The support element consists of a guide part and a support part. The guide part and the support part of the support element are arranged adjacently, the guide part at least partially, in particular completely, extending through the recess, while the support part forms a contact surface for the running rail.

In a preferred embodiment, a support width, i.e. a distance viewed in the extension direction, remains essentially constant between a rolling element at the forefront in the extension direction and a contact surface of the support element during an extension movement of the running rail. For this purpose, the support element can be moved relative to the middle rail at essentially half the speed of the running rail, for example together with a rolling element cage. A front rolling element cage with rolling elements and a rear rolling element cage with rolling elements can be arranged between the running rail and the middle rail, the support element preferably being movable together with the rear rolling element cage. The rolling element cage can be mechanically connected to the support element so that the support element is displaced along a guide on the center rail during an extension movement. However, the support element can also be moved separately from the rolling element cage by other drive means, for example a cable pull of a device for synchronizing the movement of the rails.

For smooth movement of the running rail and low frictional forces, the support element is designed according to the invention as a rotatable roller. The roller can be mounted on an axle that engages in a slot-shaped guide on the center rail. The axis of the roller can be aligned horizontally in the mounted position and perpendicular to the pull-out direction.

To ensure that the running rail is lifted backwards during a pull-out movement To avoid this, a web can be formed on the running rail Support element reaches underneath. For this purpose, the running rail can, for example, be U-shaped or C-shaped in cross section with legs projecting downwards, with an inwardly projecting web being formed on at least one leg, which engages under the support element. This means that tipping protection can be implemented using simple means in a compact design.

Preferably, at least two support elements are arranged on the middle rail and are provided on opposite sides of the middle rail.

For good support, the support element can lie in a rear area of the center rail when the center rail is fully inserted, in particular in a rear area of less than 40% of the center rail length in relation to the longitudinal direction.

For good support when the center rail is fully extended, the support element can be arranged in a rear area greater than 40% of the center rail length.

Figur 1

eine perspektivische Ansicht einer erfindungsgemäßen Auszugsführung;

Figur 2

eine Explosionsdarstellung der Auszugsführung der Figur 1;

Figuren 3A und 3B

zwei Ansichten der Auszugsführung der Figur 2 in der montierten Position;

Figuren 4A und 4B

zwei Ansichten der Auszugsführung der Figur 1 in einer eingefahrenen Position;

Figuren 5A bis 5C

mehrere Ansichten der Auszugsführung in einer mittleren Auszugsposition, und

Figuren 6A und 6B

zwei Ansichten der Auszugsführung in einer maximal ausgefahrenen Position.

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 pull-out guide according to the invention;

Figure 2

an exploded view of the pull-out guide Figure 1 ;

Figures 3A and 3B

two views of the extract guide Figure 2 in the mounted position;

Figures 4A and 4B

two views of the extract guide Figure 1 in a retracted position;

Figures 5A to 5C

several views of the pull-out guide in a middle pull-out position, and

Figures 6A and 6B

two views of the drawer guide in a maximum extended position.

A pull-out guide 1 comprises a guide rail 2, a middle rail 3 and a running rail 4, which can each be moved relative to one another and are preferably made from a bent sheet steel.

Like from the Figure 2 can be seen, the guide rail 2 has an angular design with a leg 20, which can be fixed to a wall of a furniture body or a household appliance, and an angled support leg 21, on which several raceways 22 for the first front and rear rolling elements 6 and 8 in the first front and rear rolling element cages 5 and 7 are formed. On the guide rail 2, a first front rolling element cage 5 with first front rolling elements 6 and a first rear rolling element cage 7 with first rear rolling elements 8 are provided, the first front and rear rolling elements 6 and 8 being designed as cylinders in the exemplary embodiment shown, but also as Spheres, barrels or other geometry can be used.

The middle rail 3 can be moved relative to the guide rail 2 via the first front and rear rolling elements 6 and 8, a second front rolling element cage 9 with second front rolling elements 10 and a second rear rolling element cage 11 with second rear rolling elements 12 being arranged on the central rail 3, which are used for movable storage of the running rail 4 on the middle rail 3. A push element, for example a drawer, can be fixed on the running rail 4.

A ramp 16 is embossed in the front area of the running rail 4, which cooperates with a rotatably mounted roller 15 on the middle rail 3 in order to support the running rail 4 in the retracted position on the roller 15 and thus reduce the load on the rolling elements 10, which is too could lead to flattening. Optionally, the ramp 16 and the roller 15 can be omitted.

A support element 13 in the form of a roller is also provided on the middle rail 3 and can be displaced along a guide 14, which is designed here as an elongated hole. The support element 13 consists of a support part 19, a guide part 23 and an axis 17. The components 17, 19 and 23 can also be designed integrally in a single component. Furthermore, the support element 13 can also be designed as a plain bearing.

In Fig. 3A The running rail 4 has not been shown. As shown here, the support element 13 is located in the retracted position of the pull-out guide 1 at one end of the guide 14. On the second rear rolling element cage 11 a driver 18 is formed, which lies behind the support element 13 in the longitudinal direction of the middle rail 3 and can move the support element 13 along the guide 14 when moving in the pull-out direction.

As seen in the sectional view of the Figure 3B can be seen (here with running rail 4), the support element 13 is located in the form of the roller between the running rail 4 and the guide rail 3. An axis 17 of the roller passes (partially) through the middle rail 3 and has a widened end section which is on the The side opposite the roller prevents the axis 17 from being pulled out and serves as a guide part 19.

The running rail 4 is C-shaped in cross section and has downwardly projecting legs 41, on each of which an inwardly projecting web 42 is formed. On the in Figure 3B On the right side, the web 42 engages under the support element 13 and can prevent the running rail 4 from being raised from the back if a tipping point is reached and a rearward lifting would occur due to the weight forces on the running rail 4.

A middle horizontal section 40 of the running rail 4 rests on an upper cylindrical rolling body 10 in a rolling body cage 9, which rolls on the underside on a horizontal middle section 30 of the middle rail 3.

The middle rail 3 is essentially U-shaped in cross section and has two downwardly projecting legs 31, with an outwardly projecting web 32 being formed on the leg 31 with the support element 13. On the opposite side, an inwardly projecting web 33 is formed on the leg 31, which engages under a section 22 of the guide rail 2, so that the middle rail 3 can also be secured against being lifted backwards.

In the Figure 4A the entire pull-out guide 1 is shown in a fully retracted position. In Figure 4B the same position is shown, but without showing the running rail 4. The support element 13 is arranged at the right end of the guide 14 and is located adjacent to the driver 18 on the second rear rolling element cage 11. The running rail 4 is now moved in the extension direction, i.e. after left in Figure 4A , the rolling element cages 9 and 11 move to the left due to the rotation of the rolling elements, so that the support element 13 is moved along the guide 14 via the driver 18. The distance between the second front rolling element 10 in the second front rolling element cage 9, in Seen in the pull-out direction, and a contact surface on the underside of the support element 13 with the web 42 describes the support width L of the system.

In the Figures 5A to 5C the pull-out guide 1 is shown in a middle pull-out position. Figures 5B and 5C show the pull-out guide 1 without the running rail 4. It can be seen that the running rail 4 was moved to the left via the movement of the rolling elements 10 and 12 in the second front and rear rolling element cages 9 and 11. The support element 13 was moved on the second rear rolling element cage 11 using the driver 18 and is now arranged in a central region of the guide 14. The support width L between the retracted position and the middle extended position remained constant. By moving the support element 13 together with the second front and rear rolling body cages 9 and 11, the distance between the second front rolling body 10 and the support element 13 essentially does not change.

During the pull-out movement of the running rail 4, a tipping point can arise at a position unknown to the manufacturer of the pull-out guide 1 if the weight loads on the running rail 4 ensure that the running rail 4 is raised at the back. Due to the constant design of the support width L, an abrupt lowering of the running rail 4 in the front area can be prevented. The support width L is proportional to the length of the running rail 4. For a nominal length of the running rail 4 between 250 mm and 300 mm, the support width L is preferably more than 40 mm over the entire travel path of the running rail, for example between 60 mm and 100 mm. A support width between 70 mm and 90 mm is particularly preferred because this means that lowering of the running rail 4 can be reduced by optimizing leverage ratios.

In the Figures 6A and 6B the pull-out guide 1 is shown in a fully extended position, where the running rail 4 rests against a stop. The support element 13 is moved to the end position along the guide 14, with the support width L between the second front rolling body 10 and the support element 13 also in this position essentially corresponding to the support width L in the other extension positions, i.e. has essentially not changed. When the pull-out guide is retracted from the maximum pull-out position, the support element 13 is moved again along the guide 14 into the starting position. For this purpose, the support element 13 can be connected to the second rear rolling element cage 11 be connected, for example via a cable.

In the exemplary embodiment shown, the support element 13 is designed as a roller that can roll on the web 42 of the running rail 4 in order to keep the frictional forces low. It is possible to provide a support element 13 on opposite sides of the running rail 4, i.e. on both webs 42.

The guide 14 does not have to run exclusively linearly in the extension direction, but can also be curved or inclined, for example to counteract a lowering of the running rail 4 in the front area.

In the exemplary embodiment shown, only cylindrical rolling elements 6, 8, 10 and 12 are used. It is of course also possible to design the geometry of the rolling elements differently, in particular as barrels or balls. In addition, the arrangement and number can be varied.

To move the support element 13, instead of a rolling element cage 9 or 11, another mechanical drive element can be used, for example a gear with a rack, with a relative movement of the running rail 4 to the middle rail 3 ensuring a movement of the support element 13 along the middle rail 3.

In the exemplary embodiment shown, the axis 17 is formed as a separate component on the support element 13, which is designed as a roller. It is also possible to design the roller and the axle 17 in one piece.

Reference symbol list

1

Excerpt guide

2

Guide rail

3

Middle rail

4

Running track

5

first front rolling element cage

6

first front rolling element

7

first rear rolling element cage

8th

first rear rolling element

9

second front rolling element cage

10

second front rolling element

11

second rear rolling element cage

12

second rear rolling element

13

Support element

14

guide

15

role

16

ramp

17

axis

18

taker

19

Support part

20

leg

21

support leg

22

Section

23

leadership part

30

Middle section

31

leg

32

web

33

web

40

horizontal section

41

leg

42

web

L

Support distance

Claims (14)

1. Pull-out guide (1) having a guide rail (2) which can be fixed to a furniture body, a middle rail (3) which is mounted displaceably on the guide rail (2), and a running rail (4) which is mounted displaceably on the middle rail (3) and on which a pushing element can be fixed, wherein a first front rolling element cage (5) with first front rolling elements (6) and a first rear rolling element cage (7) with first rear rolling elements (8) is provided at the guide rail (2), whereby the middle rail (3) is displaceable relative to the guide rail (2) via the first front and rear rolling elements (6, 8), and a second front rolling element cage (9) with second front rolling elements (10) and a second rear rolling element cage (11) with second rear rolling elements (12) is provided on the middle rail (3), which serve to displaceably hold the running rail (4) at the middle rail (3), wherein at least one support element (13) is arranged movably on the middle rail (3) between the running rail (4) and the middle rail (3), which, when the running rail (4) is moved in a pull-out direction, limits a rear lifting of the running rail (4) when a tipping point is reached, wherein the support element (13) has a guide part (23) and a support part (19) adjacent thereto, wherein the support element (13) is formed as a rotatably mounted roller separate from the rolling element cage (11) with rolling elements (12), characterized in that and in that the guide part (23) of the support element (13) is guided displaceably on a guide (14) on the middle rail (3).
2. Pull-out guide according to claim 1, characterized in that the guide (14) is formed by a recess in the middle rail (3).
3. Pull-out guide according to claim 1 or 2, characterized in that the guide part (23) and the support part (19) of the support element (13) are arranged adjacent and are connected to each other in a penetrating manner by the guide (14).
4. Pull-out guide according to one of the preceding claims, characterized in that a support distance (L) between a foremost second front rolling element (10) in the pull-out direction between the middle rail (3) and the running rail (4) and a contact surface of the support element (13) in the pull-out direction remains substantially constant during a pull-out movement.
5. Pull-out guide according to one of the preceding claims, characterized in that the support element (13) is guided displaceably in the pull-out direction with a further component (11) movable relative to the middle rail, the support element (13) absorbing in the guide (14) a tipping moment of the support part (19) during the displacement.
6. Pull-out guide according to one of the preceding claims, characterized in that the support element (13) is arranged separately from a second front rolling element cage (9) with second front rolling elements (10) and a second rear rolling element cage (11) with second rear rolling elements (12) between the running rail (4) and the middle rail (3), and the support element (13) is movable together with the second rear rolling element cage (11).
7. Pull-out guide according to claim 6, characterized in that the support element (13) is moved in synchronization with the second rear rolling element cage (11), for example with a cable pull.
8. Pull-out guide according to one of the preceding claims, characterized in that the roller has an axle (17), the axle (17) passing through the slot-shaped guide (14) on the middle rail (3).
9. Pull-out guide according to one of the preceding claims, characterized in that the axis of the roller in the mounted position is aligned horizontally and perpendicular to the pull-out direction.
10. Pull-out guide according to one of the preceding claims, characterized in that a web (42) is formed on the running rail (4), which engages under the support element (13).
11. Pull-out guide according to one of the preceding claims, characterized in that the running rail (4) is of C-shaped design in cross section with downwardly projecting legs (41), an inwardly projecting web (42) that engages under the support element (13) being formed on at least one leg (41).
12. Pull-out guide according to one of the preceding claims, characterized in that at least two opposing support elements (13) are arranged on the middle rail (3).
13. Pull-out guide according to one of the preceding claims, characterized in that the support element (13), in the fully pushed-in state of the middle rail (3), is located in a rear region of the middle rail (3) smaller than 40% of the middle rail length.
14. Pull-out guide according to one of the preceding claims, characterized in that, in the fully extended state of the middle rail (3), the support element (13) is located in a rearward region greater than 40% of the middle rail length.

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