Pull out the guide

Abstract

The present invention relates to a pull-out guide (1), comprising: a rail (2) that can be fixed to a furniture body; an intermediate rail (3) that is mounted so as to be movable on the guide rail (2); and a running rail (4) that is mounted so as to be movable on the intermediate rail (3) and to which a drawer element can be fixed, wherein at least one supporting element (13) is arranged between the running rail (4) and the intermediate rail (3), and when the running rail (4) moves in the pull-out direction and reaches a tilting point, the supporting element limits the rear side of the running rail (4) from rising, wherein the supporting element (13) comprises a guide portion (23) and a supporting portion (19) adjacent thereto, and the guide portion (23) of the supporting element (13) is movably guided on a guide (14) on the intermediate rail (3). According to the present invention, when the pull-out guide moves in the pull-out direction, sudden tilting of the running rail can be prevented.

Description

Technical Field

[0001] The present invention relates to a pull-out guide comprising: a guide rail that can be fixed to a furniture body; an intermediate rail that is movably mounted on the guide rail; and a running rail that is movably mounted on the intermediate rail and to which a pushing element can be fixed, at least one supporting element being arranged between the running rail and the intermediate rail and restricting rear elevation of the running rail when the running rail reaches a tilting point when moving in a pull-out direction. Background Art

[0002] EP 2 779 867 B1 discloses a pull-out guide for a drawer, comprising a main rail, an intermediate rail, and a drawer rail, each of which is movably mounted on the other via rolling elements. Two supporting profiles are arranged on the intermediate rail as independent structural units, which interact with the rolling elements to prevent the running rail from lifting off the intermediate rail when reaching a tilting point. However, installing the additional supporting profiles requires considerable effort, as they are welded to the intermediate rail.

[0003] US 2005 / 0231083 A1 discloses a pull-out guide in which rollers are fixed to a middle rail and clamped below by the running rails. This means that during the pull-out movement, when the tilting point is reached—that is, when gravity on the running rails causes the rear section to lift—the rollers can limit the lifting of the running rails in the rear section. However, the rigid arrangement of the rollers in the pull-out direction has the disadvantage that the support span at the tilting point can vary in length. The support span is the distance between the frontmost rolling element and the supporting rollers in the pull-out direction between the running rail and the middle rail. The support span changes as the running rails move from the closed position to the fully opened position. The position of the tilting point cannot be determined by the pull-out guide manufacturer because it depends on the weight of the front panel and the load of the drawer. Therefore, particularly in short pull-out guides, when the tilting point is reached and the support span is small, a sudden tilting movement of the running rails can occur. Summary of the Invention

[0004] It is therefore an object of the present invention to provide a pull-out guide in which the sudden drop of the running rail when the tilting point is reached is reduced.

[0005] This object is achieved by a pull-out guide having the features of claim 1 .

[0006] In the pull-out guide according to the present invention, at least one support element is arranged on the middle rail, and when the running rail moves in the pull-out direction, when the tilting point is reached, the support element limits the rear lifting, the support element having a guide portion and a support portion adjacent thereto, and the guide portion of the support element is displaceably guided on the guide on the middle rail. When the running rail moves in the pull-out direction, the support element also moves in the pull-out direction on the middle rail. Therefore, the support span, that is, the distance between the frontmost rolling element or the frontmost roller between the running rail and the middle rail and the contact surface of the support element with the running rail, as viewed in the pull-out direction, can be kept large, for example greater than 50 mm, so that even if the tilting point is reached too early, a sudden drop of the running rail in the front area is prevented. The movability of the support element can therefore be used to increase the support span.

[0007] Preferably, the support element is held on the center rail so that it is displaceable in the pull-out direction along a guide in the form of a groove. This allows the support element to be moved relative to the center rail to increase the support span. This results in a compact design, as the support element engages and is guided in the recess of the center rail, thus eliminating the need for additional installation space for guidance.

[0008] The supporting element can be guided linearly along the central rail, but can also be bent or aligned obliquely relative to the extension direction in order to compensate for a drop in the running rail in the front region.

[0009] The support element preferably comprises a guide portion and a support portion. The guide portion and the support portion of the support element can be arranged axially adjacent to each other, with the guide portion extending at least partially, in particular completely, through the recess, while the support portion forms a contact surface for the running rail. However, instead of a multi-part design of the support element, a one-piece design is also possible.

[0010] In a preferred embodiment, the support span, i.e. the distance between the contact surface of the foremost rolling element in the pull-out direction and the support element as viewed in the pull-out direction, remains essentially constant during the pull-out movement of the running track. To this end, the support element can be moved relative to the intermediate track at approximately half the speed of the running track, for example together with the 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 track and the intermediate track, wherein the support element is preferably 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 intermediate track during the pull-out movement. However, the support element can also be moved separately from the rolling element cage by other drive means, such as cables of a device for synchronizing the track movement.

[0011] To ensure smooth movement and low friction on the running rail, the support elements are preferably designed as rotatable rollers. The rollers can be mounted on shafts that engage in grooved guides on the intermediate rails. In the mounted position, the roller shafts can be aligned horizontally and perpendicular to the pull-out direction.

[0012] To reliably prevent the rear portion of the running rail from lifting during the extension movement, a web can be formed on the running rail that engages beneath the support element. For example, the running rail can have a U-shaped or C-shaped cross-section with downwardly projecting legs, with an inwardly projecting web formed on at least one of the legs, which engages beneath the support element. This prevents tilting with simple means and in a compact design.

[0013] Preferably, at least two support elements are arranged on the central rail, said support elements being provided on opposite sides of the central rail.

[0014] For good support, in the fully retracted state of the middle rail, the support element can be located in a rear region of the middle rail, in particular in a rear region which is less than 40% of the length of the middle rail with respect to the longitudinal direction.

[0015] In order to provide good support when the middle rail is fully extended, the support element may be located in a rear region that is greater than 40% of the length of the middle rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is explained in more detail below by way of examples of embodiment with reference to the accompanying drawings.

[0017] Figure 1 shows a perspective view of a pull-out guide according to the invention;

[0018] Figure 2 Shown Figure 1 Exploded view of the pull-out guide;

[0019] Figure 3A and Figure 3B Shown Figure 2 Two views of the pull-out guide in the assembled position;

[0020] Figure 4A and Figure 4B Shown Figure 1 Two views of the pull-out guide in the retracted position;

[0021] Figures 5A to 5C shows multiple views of the pull-out guide in an intermediate extended position, and

[0022] Figure 6A and Figure 6B Two views are shown with the pull-out guide in the maximum extended position. DETAILED DESCRIPTION

[0023] The pull-out guide 1 comprises a guide rail 2 , an intermediate rail 3 and a running rail 4 , each of which is movable relative to the other and which is preferably made of bent steel sheet.

[0024] As from Figure 2 As can be seen in FIG, the guide rail 2 has an angular design of its legs 20, which allows it to be fastened to a furniture carcass or the wall of a household appliance, and an angular support leg 21, on which a plurality of rolling surfaces 22 for the rolling elements 6 and 8 in the rolling element cages 5 and 7 are formed. A front rolling element cage 5 with rolling elements 6 and a rear rolling element cage 7 with rolling elements 8 are provided on the guide rail 2, wherein the rolling elements 6 and 8 are formed as cylinders in the illustrated embodiment, but can also be used as balls, cylinders or have other geometric shapes.

[0025] The middle rail 3 is movable relative to the guide rail 2 via rolling elements 6 and 8. A front rolling element cage 9 with rolling elements 10 and a rear rolling element cage 11 with rolling elements 12 are arranged on the middle rail 3. These cages 9 and 11 are used to movably mount the running rail 4 on the middle rail 3. A thrust element, such as a drawer, can be fixed to the running rail 4.

[0026] A ramp 16 is stamped on the front of the running rail 4 to cooperate with the rotatably mounted rollers 15 on the intermediate rail 3 to support the running rail 4 on the rollers 15 in the retracted position, thereby reducing stress on the rolling elements 10 that could cause flattening. Alternatively, the ramp 16 and the rollers 15 can be omitted.

[0027] A roller-shaped support element 13 is also provided on the central rail 3. This support element 13 can be displaced along a guide 14, which is designed here as an elongated hole. The support element 13 consists of a support portion 19, a guide portion 23, and a shaft 17. Components 17, 19, and 23 can also be designed as a single, integrated component. Furthermore, the support element 13 can also be designed as a plain bearing.

[0028] exist Figure 3A In the drawing, the running rail 4 is not shown. As shown here, the support element 13 is located at one end of the guide 14 in the retracted position of the pull-out guide 1. A driver 18 is formed on the rolling element cage 11. The driver 18 is located 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 during movement in the extension direction.

[0029] As from Figure 3BAs can be seen in the sectional view of FIG (here with the running rail 4), a support element 13 in the form of a roller is located between the running rail 4 and the intermediate rail 3. The shaft 17 of the roller is thus (partially) engaged by the intermediate rail 3 and has a widened end section, which prevents the shaft 17 from being pulled out on the side opposite the roller and serves as a support part 19.

[0030] The cross section of the running rail 4 is C-shaped and has downwardly protruding legs 41, each of which is formed with an inwardly protruding web 42. Figure 3B On the right-hand side of the running rail 4 , the web 42 engages under the supporting element 13 and can prevent the running rail 4 from lifting rearwards when reaching the tilting point and lifting rearwards due to the weight on the running rail 4 .

[0031] The middle horizontal section 40 of the running rail 4 rests on the upper cylindrical rolling elements 10 in the rolling element cage 9, which roll on the underside of the horizontal middle section 30 of the middle rail 3. The middle rail 3 is approximately U-shaped in cross section and has two downwardly projecting legs 31, with outwardly projecting webs 32 formed on the legs 31 by the support elements 13. On the opposite side, inwardly projecting webs 33 are formed on the legs 31, which engage under the section 22 of the guide rail 2, so that the rear part of the middle rail 3 is also prevented from lifting.

[0032] exist Figure 4A In FIG, the entire pull-out guide 1 is shown in the fully retracted position. Figure 4B In FIG, the same position is shown, but without the running rail 4. The support element 13 is located at the right end of the guide rail 14 and adjacent to the drive 18 on the rolling element cage 11. If the running rail 4 is now moved in the pull-out direction, i.e. Figure 4A If the front rolling element 10 in the front rolling element cage 9 moves to the left, 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 displaced along the guide 14 by the drive 18. The distance between the front rolling element 10 in the front rolling element cage 9 and the contact surface with the web 42 on the underside of the support element 13, seen in the pull-out direction, describes the support span L of the system.

[0033] exist Figures 5A to 5C In FIG, the pull-out guide 1 is shown in an intermediate extended position. Figure 5B and Figure 5CThe pull-out guide 1 is shown without the running rail 4. It can be seen that the running rail 4 is moved to the left by the movement of the rolling elements 10 and 12 in the rolling element cages 9 and 11. During this process, the support element 13 has been moved on the rolling element cage 11 with the help of the drive 18 and is now positioned in the middle area of ​​the guide 14. As a result, the support span L remains constant between the retracted position and the intermediate extended position. By moving the support element 13 along with the rolling element cages 9 and 11, the distance between the frontmost rolling element 10 and the support element 13 remains essentially unchanged.

[0034] During the pull-out movement of the running rail 4, if the weight load on the running rail 4 causes the running rail 4 to lift at the rear, a tilting point may occur at a location unknown to the manufacturer of the pull-out guide 1. By maintaining a constant support span L, a sudden drop of the running rail 4 in the front area can be prevented. The support span L is proportional to the length of the running rail 4. For a nominal running rail 4 length between 250 mm and 300 mm, the support span L is preferably greater than 40 mm over the entire travel distance of the running rail, for example, between 60 mm and 100 mm. A support span between 70 mm and 90 mm is particularly preferred because it allows the lowering of the running rail 4 to be reduced through an optimized leverage ratio.

[0035] exist Figure 6A and Figure 6B In the figure, the pull-out guide 1 is shown in the fully extended position in which the running rail 4 rests against the stop. The support element 13 has been moved along the guide 14 to the end position, and in this position, the support span L between the frontmost rolling element 10 and the support element 13 is essentially the same as the support span L in the other extended positions, i.e., it has not changed substantially. When the pull-out guide is retracted from the maximum extended position, the support element 13 is moved backward along the guide 14 to the starting position. For this purpose, the support element 13 can be connected to the rolling element cage 11, for example, by a cable.

[0036] In the embodiment shown, the support elements 13 are designed as rollers that can roll on the webs 42 of the running rail 4 to maintain low friction. Alternatively, sliding elements can also be provided as support elements 13 that are not rotatably mounted. Support elements 13 can also be provided on opposite sides of the running rail 4, i.e., on both webs 42.

[0037] The guide 14 does not have to extend only linearly in the extension direction, but can also be oriented in a curved or inclined manner, for example in order to compensate for a lowering of the running rail 4 in the front region.

[0038] In the example shown, only cylindrical rolling elements 6, 8, 10 and 12 are used. Of course, the geometry of the rolling elements can also be designed differently as cylinders or balls. In addition, the arrangement and number can be changed.

[0039] Instead of rolling element cage 9 or 11 , another mechanical drive element, for example a gear with a rack, can be used to move support element 13 , wherein the relative movement of running rail 4 and central rail 3 provides movement of support element 13 along central rail 3 .

[0040] In the embodiment shown, the shaft 17 is formed as a separate component, which is designed as a roller, on the support element 13. It is also possible to form the roller and the shaft 17 in one piece.

[0041] Reference Signs List

[0042] 1 Pull out the guide

[0043] 2 guide rails

[0044] 3 Middle Track

[0045] 4 running tracks

[0046] 5 Rolling element cage

[0047] 6 Rolling elements

[0048] 7 Rolling element cage

[0049] 8 Rolling elements

[0050] 9 Rolling element cage

[0051] 10 Rolling elements

[0052] 11 Rolling element cage

[0053] 12 Rolling elements

[0054] 13 Support elements

[0055] 14 guides

[0056] 15 Roller

[0057] 16 Slope

[0058] 17 Axis

[0059] 18 Driver

[0060] 19 Support part

[0061] 20 legs

[0062] 21 Support Leg

[0063] 22 sections

[0064] 23 Boot section

[0065] 30 middle section

[0066] 31 legs

[0067] 32 belly plate

[0068] 33 belly plate

[0069] 40 horizontal sections

[0070] 41 legs

[0071] 42 belly plate

[0072] L Support span.

Claims

1. A pull-out guide (1), comprising: a guide rail (2) that can be fixed to a furniture body; an intermediate rail (3) that can be displaceably mounted on the guide rail (2); and a running rail (4) that can be displaceably mounted on the intermediate rail (3) and on which a pushing element can be fixed, wherein a first front rolling element holder (5) with a first front rolling element (6) and a first rear rolling element holder (7) with a first rear rolling element (8) are provided on the guide rail (2), and the intermediate rail (3) can be moved relative to the guide rail (2) by means of the first front rolling element (6) and the first rear rolling element (8), wherein the intermediate rail (3) is provided with a second front rolling element retainer (9) with a second front rolling element (10) and a second rear rolling element retainer (11) with a second rear rolling element (12), the second front rolling element retainer (9) and the second rear rolling element retainer (11) are used to movably retain the running track (4) on the middle track (3), between the running track (4) and the middle track (3), at least one supporting element (13) is movably arranged on the middle track (3), when the running track (4) moves in the pulling direction and reaches the tilting point, the supporting element (13) limits the rear lifting of the running track (4), wherein, The support element (13) has a guide portion (23) and a support portion (19) adjacent thereto, the support element (13) being formed as a rotatably mounted roller separated from the second rear rolling element retainer (11) having the second rear rolling element (12), and the guide portion (23) of the support element (13) being displaceably guided on the guide member (14) on the intermediate rail (3).

2. The pull-out guide according to claim 1, wherein The guide (14) is formed by a recess in the intermediate rail (3).

3. The pull-out guide according to claim 1 or 2, characterized in that The guide portion (23) and the support portion (19) of the support element (13) are arranged axially adjacent to each other and are connected to each other in a penetrating manner via the guide (14).

4. The pull-out guide according to claim 1, wherein A support span (L) between the second front rolling element (10) furthest forward in the pulling-out direction and the contact surface of the support element (13) or the support portion (19) in the pulling-out direction between the intermediate rail (3) and the running rail (4) remains substantially constant during the pulling-out movement.

5. The pull-out guide according to claim 1, wherein The support element (13) is displaceably guided in the pull-out direction by the second rear rolling element retainer (11) which is movable relative to the intermediate rail, and the support element (13) in the guide (14) absorbs the tilting moment of the support portion (19) during displacement.

6. The pull-out guide according to claim 1, wherein The supporting element (13) is arranged separately from the second front rolling element retainer (9) having the second front rolling element (10) and the second rear rolling element retainer (11) having the second rear rolling element (12) between the running track (4) and the intermediate track (3), and the supporting element (13) moves together with the second rear rolling element retainer (11).

7. The pull-out guide according to claim 6, wherein The support element (13) moves synchronously with the second rear rolling element cage (11), for example, via a cable.

8. The pull-out guide according to claim 1, wherein The roller has an axle (17) which passes through a slotted guide (14) on the intermediate track (3).

9. The pull-out guide according to claim 1, wherein The axis of the roller in the mounted position is aligned horizontally and perpendicular to the pull-out direction.

10. The pull-out guide according to claim 1, wherein A web (42) is formed on the running rail (4), and the web is engaged below the supporting element (13).

11. The pull-out guide according to claim 1, wherein The running rail (4) has a cross-section of C-shaped design with downwardly protruding legs (41), wherein an inwardly protruding web (42) engaging below the supporting element (13) is formed on at least one of the legs (41).

12. The pull-out guide according to claim 1, wherein At least two opposing support elements (13) are arranged on the intermediate rail (3).

13. The pull-out guide according to claim 1, wherein In the completely inserted state of the central rail (3), the support element (13) is located in a rear region of the central rail (3) that is less than 40% of the length of the central rail.

14. The pull-out guide according to claim 1, wherein In the fully extended state of the central rail (3), the support element (13) is located in a rear region that is greater than 40% of the length of the central rail.

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