Pull-out guide

Abstract

The invention relates to a pull-out guide (1) comprising: a stationary guide rail (2) that can be fixed to a body; a middle rail (3) that is held on the guide rail (2) such that it can be moved via first rolling elements (5); a running rail (4) that is held on the middle rail (3) such that it can be moved via second rolling elements (6); and a bearing block (20) that is fixed to the middle rail (3) and has a rotatable support roller (11) for supporting the running rail (4) over at least part of the movement path of the running rail (4), wherein the support roller (11) extends through an opening at an upper portion of the middle rail (3), wherein the support roller (11) can be moved in a vertical direction and is held in a raised position by at least one spring element (27). This allows the support roller (11) to be substantially held at the height at which it is arranged in the retracted position between the running rail (4) and the guide rail (2).

Description

[0001] Drawer guide

[0002] The present invention relates to a pull-out guide comprising a stationary guide rail which can be fixed to a body, a central rail which is held on the guide rail so as to be movable via first rolling elements, a running rail which is held on the central rail so as to be movable via second rolling elements, and a bearing block which is fixed to the central rail and has a rotatable support roller for supporting the running rail at least over part of the travel path of the running rail, wherein the support roller passes through an opening in an upper section of the central rail.

[0003] DE 10 2019 124 732 A1 discloses a pullout guide with a stationary guide rail, a center rail, and a running rail, which are movable relative to one another via rolling elements. To align the running rail in the retracted position, a support element with a roller is fixed to the center rail, which can roll along a groove on the running rail. This enables the running rail to be supported on the guide rail via the roller. For the vertically movable mounting of the roller, a U-shaped bearing block, which is secured via webs, is inserted into an upper recess in the center rail. Due to the delicate webs, the bearing block must be installed with great precision. If the support roller hits the guide rail and is lifted, unwanted impact noises can occur.

[0004] It is therefore an object of the present invention to provide a pull-out guide in which the support roller is guided on the bearing block in an improved manner.

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

[0006] In the pull-out guide according to the invention, the support roller on the bearing block is movable in a vertical direction and is held in a raised position by at least one spring element. As a result, when the pull-out guide is moved, the support roller on the center rail can be held at a height that essentially corresponds to the height when it is arranged between the guide rail and the running rail and supports the running rail in the retracted position of the pull-out guide. The support roller is therefore permanently in the raised position and can be pressed down onto the guide rail for support without the support roller hitting an end face of the guide rail during a closing movement, which would create impact noises. The support roller can also be lowered against the force of the spring element if necessary, for example when rolling elements run over the support roller.

[0007] Preferably, the spring element is connected to the bearing block on one side and formed to rest against the support roller on the other. The spring element can optionally be formed integrally with the bearing block and comprise a flexible spring bar which optionally rests against an outer circumference of the support roller in the lower area or against a pin of the support roller which forms the axis of rotation. When the support roller moves downwards, the free end of the spring element can then be deflected. Optionally, the spring element can also be mounted on the bearing block as a separate component. The spring element can also be arranged in a groove or slot on the bearing block and act, for example, on a bearing of the support roller or directly on the support roller. A spring can thus also be arranged in a vertical guide for the support roller, which can optionally also be inclined to the vertical or curved.

[0008] The support roller preferably comprises at least one pin pivoting about a rotational axis and mounted for displacement in a vertical guide. The vertical guide can be formed by a groove or a slot in the bearing block. Preferably, pins are formed on opposite sides of the support roller, each of which is displaceable in a vertical guide. The pin can be formed integrally with the support roller. In another preferred embodiment, the pin can be mounted in the support roller as a separate axle. The support roller can also be guided substantially vertically via a groove arranged at an angle to the vertical or via a curved track.

[0009] In a further embodiment, when the pull-out guide is in the extended position, at least some of the second rolling elements can be moved between the running rail and the middle rail over the support roller, wherein the support roller can be lowered against the force of the spring element. Thus, maximum vertical movement essentially only occurs in an extension position, in particular a few centimeters before the maximum extension position, since only then does the foremost rolling element arrive at a front end of the middle rail and strike the support roller, which is then lowered so that the rolling elements can travel over it. During a movement in the closing direction, the support roller is held in a raised position by the spring element, in particular in a middle extension position, in which the underside of the support roller is arranged at essentially the same height as a track on the guide rail for the support roller.In a preferred embodiment, the support roller can rest on the guide rail, particularly in a middle extension position in the raised position, and does not rest on the guide rail.

[0010] The spring element can also be designed or manufactured as a separate part and separately from the bearing block. It is essential that the spring element moves the support roller into a raised position when the support roller is mounted. For this purpose, the spring element can be arranged as a separate part on the center rail. In this configuration, the support roller can rest against the running rail in the raised position, particularly in a central extension position, and not against the guide rail.

[0011] Alternatively, the spring element can also be arranged on the guide rail, wherein the spring element projects beyond the track of the guide rail so that the support roller is moved into the raised position shortly before it hits the track. The spring element can be designed as a leaf spring, for example. In this embodiment, the support roller is in its lowest position, particularly in a middle extension position up to the fully extended extension position, and does not rest on the guide rail. The spring element can rest on an outer circumference of the support roller or on the pin of the support roller. In this embodiment, the position of the spring element depends on the relative positions of the rails.

[0012] For easy installation of the support roller, it can be secured to the bearing block using a holding section which is formed on a vertical web of the center rail with a recess open towards one end. The holding section on the bearing block can then be pushed into the recess from the end to mount the bearing block with the support roller. The holding section can have a groove which is inserted into an edge of the recess to ensure stable fixation of the bearing block. The holding section can be fixed to the recess in a clamping or locking manner. The recess is preferably designed as an elongated hole which is aligned at an angle to the longitudinal direction of the center rail so that when the holding section is pushed in, the support roller can be lifted towards an opening in the center rail.

[0013] The invention will be explained in more detail below using an exemplary embodiment with reference to the accompanying drawings. They show:

[0014] Figures 1 A to 1 D show several views of a pull-out guide according to the invention;

[0015] Figures 2A and 2B show several sectional views of the pull-out guide of Figure 1 in different positions;

[0016] Figures 3A and 3B show two detailed views of the middle rail in different

[0017] positions;

[0018] Figures 4A and 4B show two views of a section of the center rail in front of the

[0019] Installation of a modified bearing block;

[0020] Figures 5A to 5D show several views of the center rail of Figure 4 with the mounted bearing block;

[0021] Figures 6A to 6C show several views of the mounting of the bearing block of Figure 4 on the middle rail, and

[0022] Figures 7A to 7E show several views of the bearing block for mounting on the

[0023] Center rail according to Figure 4.

[0024] A pull-out guide 1 comprises a guide rail 2 that can be secured to the body of a piece of furniture or a household appliance, on which a center rail 3 is movably mounted via first rolling elements 5. A running rail 4, to which a drawer or other sliding element can be fixed, is movably held on the center rail 3 via second rolling elements 6. A hook 7 for fixing a sliding element is provided in the rear area of ​​the running rail 4. The rolling elements 5 and 6 can be designed as cylinders that roll on flat tracks. Alternatively, the tracks can also have a different geometry, and the rolling elements 5 and 6 can be designed as barrels or balls.On the guide rail 4, a downwardly projecting strip-shaped embossing 8 is provided at a front section in the extension direction. In the retracted position of the pull-out guide 1, this strip-shaped embossing is supported on a support roller 11 in order to align the guide rail 4 with the guide rail 2 in the retracted position. The support roller 11 is rotatably mounted on a bearing block 20, which is fixed to the center rail 3. In the retracted position, the support roller 11 is supported on its underside on a track on the guide rail 2.

[0025] In Figure 2A, the pull-out guide 1 is shown in a slightly extended position, and the support roller 11 has left a track 10 on the upper side of the guide rail 2. The support roller 11 is held in the raised position by a spring element 27 and protrudes upwards above an upper side of the center rail 3. The embossed portion 8 on the guide rail 4, which forms a ramp at least partially inclined to the longitudinal direction of the guide rail 4, is already arranged in this position at a distance from the support roller 11 in the longitudinal direction of the guide rail 2.

[0026] If the pull-out guide 1 is moved further in the pull-out direction, the position shown in Figure 2B is reached. The rolling elements 6 between the guide rail 4 and the center rail 3 have reached the area of ​​the support roller 11, with the track for the rolling elements 6 located in the area of ​​the support roller 11. When the frontmost rolling element 6 hits the support roller 11, the support roller 11 is pressed downward against the force of the spring element 27, so that the rolling elements 6 can travel over the area of ​​the support roller 11 and an opening 13 in the center rail 3. If the pull-out guide 1 is moved back into the retracted position, the rolling elements 6 move away from the support roller 11, which is then pushed upwards by the spring element 27, so that the support roller 11 can be moved back to the guide rail 2 and the track 10 for the support roller 11 arranged there, via the position shown in Figure 2A.

[0027] Figure 3A shows the center rail 3 with the guide rail 2 in a retracted position, in which the support roller 11 protrudes through the opening 13 on the upper section 30 of the center rail 3, which is horizontal in the installed situation, and also rolls on the raceway 10 on a horizontal section of the guide rail 2. The raceway 10 has a downward bend 12 at its front end, which prevents the support roller 11 from hitting a sharp edge. Due to this bend, the raceway 10 is curved downwards at the end. Figure 3B shows the center rail 3, in which the rolling elements 6 between the center rail 3 and the guide rail 4 are in a maximum extension position. The guide rail 4 is not shown here, and it can be seen that at least some of the rolling elements 6, which are arranged at the front in the extension direction, have passed over the opening 13 with the support roller 11.The rolling elements 6 are held on a rolling element cage 17. In addition to the upper rolling elements 6, which roll on an upper horizontal section 30 of the center rail 3, at least two rolling elements 18 with a vertical axis are also provided on the rolling element cage 17. These rolling elements roll on the webs 31 and 32 of the center rail 3 to provide lateral guidance. Other geometries of rolling element cages 17 can also be used.

[0028] Figures 4A and 4B show the bearing block 20 mounted on the center rail 3. The center rail 3 has an upper horizontal section 30 and two vertical webs 31 and 32. A recess 14 is provided on the vertical web 32, open toward one end of the center rail 3, with a locking receptacle 16 formed on the edge. Furthermore, an optional horizontal web 33 is integrally formed on the vertical web 32.

[0029] The bearing block 20, on which the support roller 11 is rotatably mounted, is mounted on the center rail 3. The bearing block 20 has a lateral holding section 22 comprising a spring bar 23 with a locking projection 24. For assembly, the holding section 22 with the spring bar 23 is inserted into the recess 14, and the locking projection 24 is locked to the locking receptacle 16.

[0030] Figures 5A to 5D show the bearing block 20 in its assembled position. The retaining section 22 is located with the spring bar 23 in the recess 14, with the locking projection 24 inserted into the locking receptacle 16. The support roller 11 extends through an opening in the upper section 30 of the center rail 3.

[0031] Figures 6A to 6C show the individual steps of assembling the bearing block 20. In Figure 6A, the retaining section 22 is located in front of the recess 14 and is inserted into it. In Figure 6B, the locking projection 24 is arranged on the end face of the center rail 3 and is now pressed inward due to its shape, so that the spring bar 23 is bent. By further inserting the retaining section 22, the locking projection 24 reaches the area of ​​the locking receptacle 16 and can be locked there, so that the retaining section 22 is secured against removal from the recess 14.

[0032] Figures 7A to 7E show the bearing block 20 in detail. The bearing block 20 comprises the holding section 22 arranged on one side with the spring web 23, wherein the holding section 22 has a groove 25 on an upper side into which an edge of the recess 14 can be inserted. The groove 25 engages around the edge of the recess 14 on the upper side. Optionally, a further groove can be provided on the underside of the holding section 22 in order to fix the bearing block 20 to the recess 14 in a rotationally secure manner; for example, a stop can bear against an inner side of the essentially vertical web 32. The support roller 11 is held here on the bearing block 20 via a pin 29 in the vertical guide 291.

[0033] A flexible spring element 27 is integrally formed on the bearing block 20 adjacent to the support roller 11 and is arranged adjacent to a circumference of the support roller 11 on a frame around the support roller 11. The spring element 27 is preferably attached to a stop 26 on the side of the support roller 11 facing away from the end face of the center rail 3. The spring element 27 rests with a free end 28 on the outer circumference of the support roller 11 and holds it in a raised position on the bearing block 20. As a result, the support roller 11 can be held substantially at the same height as in the retracted position when it is arranged between the running rail 4 and the guide rail 2, even when the support roller 11 moves away from the guide rail 2.

[0034] The bearing block 20 can be fixed to the center rail 3 without welding, gluing, or other fastening means. For mounting the support roller 11, the holding section 22 is inserted into the recess 14 at an angle to the longitudinal direction of the center rail 3, so that the support roller 11 is lifted during mounting of the bearing block 20 and positioned at or in the opening 13.

[0035] The spring element can also be designed as a separate part and separate from the bearing block 20. It is essential that, when the support roller 11 is mounted, the spring element moves the support roller 11 into a raised position. For this purpose, the spring element can be arranged as a separate part on the center rail 3. Alternatively, the spring element can also be arranged on the guide rail 2, with the spring element projecting beyond the track 10 of the guide rail 2 so that the support roller 11 is moved into the raised position shortly before it hits the track 10. The spring element can be designed, for example, as a leaf spring.

[0036] List of reference symbols

[0037] 1 drawer guide

[0038] 2 guide rails

[0039] 3 middle rail

[0040] 4 guide rail

[0041] 5 rolling elements

[0042] 6 rolling elements

[0043] 7 hooks

[0044] 8 Embossing

[0045] 10 Career

[0046] 11 Support roller

[0047] 12 Turn

[0048] 13 Opening

[0049] 14 Recess

[0050] 16 locking mount

[0051] 17 Rolling element cage

[0052] 18 rolling elements

[0053] 20 bearing block

[0054] 22 stopping section

[0055] 23 spring bar

[0056] 24 locking projection

[0057] 25 grooves

[0058] 26 stop

[0059] 27 Spring element

[0060] 28 End

[0061] 29 cones

[0062] 291 leadership

[0063] 30 upper section

[0064] 31 vertical bridge

[0065] 32 vertical bridge

[0066] 33 horizontal bridge

Claims

Claims 1. Pull-out guide (1), comprising: a) a stationary guide rail (2) which can be fastened to a body; b) a central rail (3) which is held on the guide rail (2) so as to be movable via first rolling elements (5); c) a running rail (4) which is held on the central rail (3) so as to be movable via second rolling elements (6), and d) a bearing block (20) which is fixed to the central rail (3) and has a rotatable support roller (11) for supporting the running rail (4) at least over part of the travel path of the running rail (4), wherein the support roller (11) passes through an opening in an upper section of the central rail (3), characterized in that the support roller (11) is movable in the vertical direction and is held in a raised position by at least one spring element (27).

2. Pull-out guide according to claim 1, characterized in that the spring element (27) is connected to the bearing block (20) on one side and rests on the support roller (11) on the other side (28).

3. Pull-out guide according to claim 1 or 2, characterized in that at least one pin (29) is arranged on the support roller (11) around an axis of rotation, which pin is displaceably mounted in a vertical guide.

4. Pull-out guide according to one of the preceding claims, characterized in that the spring element (27) is formed integrally with the bearing block (20).

5. Pull-out guide according to one of the preceding claims, characterized in that in an extended position of the pull-out guide (1), at least a part of the second rolling elements (6) can be moved between the running rail (4) and the central rail (3) via the support roller (11) and the support roller (11) can be lowered against the force of the spring element (27).

6. Pull-out guide according to one of the preceding claims, characterized in that the spring element (27) rests on an outer circumference of the support roller (11).

7. Pull-out guide according to one of claims 1 to 5, characterized in that the spring element rests on at least one pin (29) on a rotation axis of the support roller (11).

8. Pull-out guide according to one of the preceding claims, characterized in that the spring element (27) is arranged as a component separate from a bearing block (20) on the central rail (3) or the guide rail (2).

9. Pull-out guide according to one of the preceding claims, characterized in that the central rail (3) has a recess (14) on a vertical web (32) which is open towards one end face and to which the bearing block (20) is fixed by means of a holding section (22).

10. Pull-out guide according to claim 9, characterized in that the holding section (22) has a groove (25) into which an edge of the recess (14) is inserted.

11. Pull-out guide according to claim 9 or 10, characterized in that the holding section (22) is fixed to an edge of the recess (14) by clamping or by means of locking means.

12. Pull-out guide according to one of the preceding claims, wherein the central rail (3) has an upper section (30) which is at least partially designed as a track for the rolling elements (6), wherein the upper section (30) has an opening (13) through which the support roller (11) can pass.

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