PULL-OUT GUIDE

Abstract

The invention relates to a pull-out guide for pulling out an extractable furniture part (5) from a furniture carcass (4), the pull-out guide comprising a first rail (1) and a second rail (2), wherein the pulling of the first rail (1) out of the second rail (2) is limited by a stop element (13) of the first tail (1) striking a pull-out stop (12) of the second rail (2). A securing part (14) is mounted on the second rail (2) so as to be rotatable about an axis of rotation (15), which securing part can be rotated, counter to the force of a spring element (16), from a blocked position, in which lifting of the front end of the first rail (1) is blocked, in a rotational opening direction into a release position, in which the front end of the first rail (1) can be lifted and the stop element (13) of the first rail (1) can be moved over the pull-out stop (12) of the second rail (2). A holding device is provided which, in a holding state, holds the securing part (14), totaled into the release position, in the release position.

Claims

1. A pull-out guide for pulling out an extractable furniture part (5) from a furniture carcass (4), comprising a first rail (1) and a second rail (2), wherein the first rail (1) can be pulled out from the second rail (2) in a pull-out direction (6) starting from an inserted position into an extracted position in which a further pulling out of the first rail (1) from the second rail (2) is delimited by a stop element (13) of the first rail (1) striking a pull-out stop (12) of the second rail (2), and wherein a securing part (14) is mounted on the second rail (2) so as to be rotatable about an axis of rotation (15), which securing part can be twisted counter to the force of a spring element (16) from a blocked position in which a lifting of the front end of the first rail (1) is blocked, in an opening direction of rotation into a release position in which, for complete removal of the first rail (1) from the second rail (2) starting from the extracted position of the first rail (1), the front end of the first rail (1) can be lifted and the stop element (13) of the first rail (1) can be moved over the pull-out stop (12) of the second rail (2), characterized in that a holding device is provided which, in a holding state, holds the securing device (14) twisted into the release position in the release position.

2. The pull-out guide according to claim 1, characterized in that during twisting of the securing part (14) from the blocked position into the release position, the holding device automatically adopts the holding state.

3. The pull-out guide according to claim 2, characterized in that the holding device is configured as a snap connection.

4. The pull-out guide according to claim 3, characterized in that in order to form the snap connection the securing part (14) has an elastic tongue (17) which has a locking tab (18) which, in the holding state of the holding device, cooperates with a retaining surface (2a) disposed on the second rail (2).

5. The pull-out guide according to claim 1, characterized in that the pull-out guide has a third rail (3) wherein the second rail (2) can be pulled out in the pull-out direction (6) from the third rail (3) starting from an inserted position into an extracted position, wherein in the inserted position of the first and second rail (1, 2) a closed position of the pull-out guide a closed position of the pull-out guide exists and in the extracted position of the first and second rail (1, 2) an open position of the pull-out guide exists and wherein preferably during movement of the first rail (1) with respect to the second rail (2) the second rail (2) moves synchronously with respect to the third rail (3).

6. The pull-out guide according to claim 5, characterized in that in a central region of its longitudinal extension, the second rail (2) has a rotatably mounted load-transmitting differential roller (7) which has some play in the vertical direction with respect to the second rail (2) and rolls between a track (1a) of the first rail (1) and a track (3a) of the third rail (3).

7. The pull-out guide according to claim 3, wherein the pull-out guide has a third rail (3) wherein the second rail (2) can be pulled out in the pull-out direction (6) from the third rail (3) starting from an inserted position into an extracted position, wherein in the inserted position of the first and second rail (1, 2) a closed position of the pull-out guide a closed position of the pull-out guide exists and in the extracted position of the first and second rail (1, 2) an open position of the pull-out guide exists and wherein preferably during movement of the first rail (1) with respect to the second rail (2) the second rail (2) moves synchronously with respect to the third rail (3), and characterized in that during insertion of the second rail (2) into the third rail (3) starting from a state in which the second rail (2) is located in the extracted position and the securing part (14) is located in the release position, a section of the third rail (3) approaches a section of the snap connection and opens the snap connection, wherein the spring element (16) twists the securing part (14) into the blocked position.

8. The pull-out guide according to claim 4, wherein during insertion of the second rail (2) into the third rail (3) starting from a state in which the second rail (2) is located in the extracted position and the securing part (14) is located in the release position, a section of the third rail (3) approaches a section of the snap connection and opens the snap connection, wherein the spring element (16) twists the securing part (14) into the blocked position, and characterized in that during insertion of the second rail (2) into the third rail (3) starting from a state in which the second rail (2) is located in the extracted position and in which the securing part (14) is located in the release position, the front end of an upper horizontal web (3b) of the third rail (3) approaches the elastic tongue (17) of the securing part (14) and opens the snap connection.

9. The pull-out guide according to claim 4, wherein the pull-out guide has a third rail (3) wherein the second rail (2) can be pulled out in the pull-out direction (6) from the third rail (3) starting from an inserted position into an extracted position, wherein in the inserted position of the first and second rail (1, 2) a closed position of the pull-out guide a closed position of the pull-out guide exists and in the extracted position of the first and second rail (1, 2) an open position of the pull-out guide exists and wherein preferably during movement of the first rail (1) with respect to the second rail (2) the second rail (2) moves synchronously with respect to the third rail (3), and characterized in that the upper horizontal web (3b) of the third rail (3) has a clearance (19) which in the inserted position of the second rail (2) and in the release position of the securing part (14) receives at least an end portion of the elastic tongue (17) of the securing part (14).

10. The pull-out guide according to claim 9, characterized in that during extraction of the second rail (2) from the third rail (3) starting from a state in which the second rail (2) is located in the inserted position and the securing part (14) is located in the release position, approaches a free end of the elastic tongue (17) on the upper horizontal web (3b) of the third rail (3) and opens the snap connection, wherein the spring element (16) twists the securing part (14) into the blocked position.

11. The pull-out guide according to claim 4, wherein in a central region of its longitudinal extension, the second rail (2) has a rotatably mounted load-transmitting differential roller (7) which has some play in the vertical direction with respect to the second rail (2) and rolls between a track (1a) of the first rail (1) and a track (3a) of the third rail (3), and characterized in that starting from a state in which the first rail (1) is removed from the second rail (2) and the securing part (14) is located in the release position, during insertion of a rear end of the first rail (1) between the differential roller (7) and a support roller (8) located thereover, the central rail lifts and the free end of the elastic tongue (17) is pressed against the upper horizontal web (3b) of the third rail (3), wherein the snap connection opens.

12. The pull-out guide according to claim 1, characterized in that the preferably band-shaped spring element (16) running in a curved shape, and the securing part (14) are configured in one piece, preferably in one piece of material, wherein an end of the spring element (16) remote from the securing part (14) is supported on the second rail (2).

13. The pull-out guide according to claim 1, characterized in that the securing part (14) has a stop surface (14a) with which it cooperates in the blocked position with a support surface (lb) of the first rail (1) and blocks any lifting of a front end of the first rail (1) by abutment of the support surface (lb) on the contact surface (14a), wherein the securing part (14) in a side view seen in the direction parallel to the axis of rotation (15) has an external contour which has a greater distance from the axis of rotation (15) in the region of the contact surface (14a) than in regions adjacent to the contact surface (14a).

14. The pull-out guide according to claim 13, characterized in that in the blocked position of the securing part (14) when a force acts on the contact surface (14a) perpendicularly upwards, a torque is applied to the securing part (14) which acts contrary to the opening direction of rotation and which is supported by abutment of a stop of the securing part (14) on a stop surface disposed on the second rail (2).

15. The pull-out guide according to claim 1, characterized in that during insertion of the removed first rail (1) into the second rail (2) from the rear end of the first rail (1), the securing part (14) located in the blocked position can be twisted into the release position.

Description

[0014] Further advantages and details of the invention are explained hereinafter with reference to the appended drawings. In the figures:

[0015] FIG. 1 shows an oblique view of an exemplary embodiment of a pull-out guide according to the invention in the closed position of the pull-out guide;

[0016] FIG. 2 shows an oblique view similar to FIG. 1 in the open position of the pull-out guide;

[0017] FIG. 3 shows a front-side view of the pull-out guide, wherein parts of a furniture carcass and an extractable furniture part are indicated by dashed lines;

[0018] FIGS. 4 and 5 show oblique views of the third rail from different viewing directions;

[0019] FIGS. 6 and 7 show oblique views of the second rail from different viewing directions;

[0020] FIGS. 8 and 9 show oblique views of the first rail from different viewing directions;

[0021] FIG. 10 shows an enlarged section of a front section of the second rail in side view (at right angles to the pull-out direction) in the blocked position of the securing part;

[0022] FIG. 11 shows a diagram similar to FIG. 10 in the release position of the securing part;

[0023] FIGS. 12, 13 and 14 show oblique views of the securing part from different viewing directions;

[0024] FIGS. 15 and 16 show a front and rear view of the securing part;

[0025] FIG. 17 shows the pull-out guide in the closed position in side view (at right angles to the pull-out direction);

[0026] FIG. 18 shows a diagram similar to FIG. 17 in the open position of the pull-out guide;

[0027] FIG. 19 shows a diagram similar to FIGS. 17 and 18 during removal of the first rail;

[0028] FIGS. 20 to 22 show side views of the pull-out guide during insertion of the first rail, wherein the third rail is cut in the region of the securing part;

[0029] FIG. 23 shows an enlarged section from FIG. 20 in the region of the securing part;

[0030] FIG. 24 shows an enlarged section from FIG. 22 in the region of the securing part;

[0031] FIG. 25 shows a section of a front end portion of the pull-out guide during insertion of the first rail in the release position of the securing part during approach of the elastic tongue of the securing part to the third rail;

[0032] FIGS. 26 to 28 show side views during insertion of the first rail into the second rail when the securing part is initially in the blocked position.

[0033] An exemplary embodiment of a pull-out guide according to the invention is explained hereinafter with reference to FIGS. 1 to 28. The pull-out guide is configured as a roller pull-out. In a roller guide, rollers which bring about the mutual displaceable guidance of the rails are rotatably mounted on the rails. The pull-out guide comprises a first rail 1, a second rail 2 and a third rail 3 wherein in the exemplary embodiment all the rollers are rotatably mounted on the second rail. The third rail 3 is used for attachment to a furniture carcass 4 of which only a section is indicated by dashed lines in FIG. 3. The first rail 1 is used for attachment to an extractable furniture part 5, for example, a drawer of which only a section is indicated by dashed lines in FIG. 3. The third rail 3 could also be designated as carcass rail, the second rail 2 as middle rail and the first rail 1 as pull-out rail.

[0034] The rails 1-3 are guided synchronously, i.e. during extraction of the first rail 1 from the second rail 2 in a pull-out direction 6, the second rail 2 is displaced synchronously with respect to the third rail 3 in the pull-out direction 6. In this case, with respect to the third rail 3 the second rail 2 covers half the distance of the first rail 1 in each case.

[0035] A differential roller arranged rotatably on the second rail 2 in the central region of its longitudinal extension is used for synchronous guidance of the rails 1 to 3, which roller rolls between a downwardly directed track 1a of the first rail 1 arranged on the underside of a horizontal web 1c and an upwardly directed track 3a of the third rail 3 arranged on the upper side of a lower horizontal web and hereby transfers a part of the load of the first rail 1 directly onto the third rail 3. The differential roller 7 here has some play in the vertical direction. Such pull-outs are also known as “differential pull-outs”.

[0036] Located in a central region of the longitudinal extension of the second rail 2 above the differential roller 7, in the exemplary embodiment somewhat offset towards the front with respect to the differential roller 7 is a support roller 8 which can support the rear end of the first rail 1 in the extracted position of the first rail 1 in the upward direction.

[0037] In the exemplary embodiment, as already mentioned, all the rollers are arranged on the middle rail as is preferred in differential pull-out guides. In particular, a roller 9 cooperating with the same upwardly directed track 3a of the third rail 3 as the differential roller 7 is located in the region of the front end of the second rail 2 and a roller 10 cooperating with a downwardly directed track of the third rail 3 arranged on the underside of an upper horizontal web 3b is located in a rear region of second rail 2. An auxiliary roller 11 which supports the rear end of the first rail 1 in the inserted position of the first rail 1 in the downward direction is preferably rotatably mounted in the region between the differential roller 7 and the rear end of the second rail 2.

[0038] A pull-out stop 12 of the second rail 2 which a stop element 13 of the first rail approaches in the extracted position of the first rail 1 is used to delimit the pulling out of the first rail 1 with respect to the second rail 2 in the extracted position of the first rail 1. Furthermore a securing part 14 is arranged on the second rail 2 which will be explained in detail hereinafter and which, in a blocked position, prevents the front end of the first rail 1 from being able to be raised (apart from a certain play) and the stop element 13 from being able to be moved over the pull-out stop 12.

[0039] The pulling out of the second rail 2 with respect to the third rail 3 and the insertion of the first rail 1 into the second rail 2 and of the second rail 2 into the third rail 3 are also delimited by stops which can be configured according to the prior art and are not explained in detail at this point.

[0040] In the closed position of the pull-out guide the first rail 1 has its inserted position in which it is completely inserted into the second rail 2 and the second rail 2 has the inserted position in which it is completely inserted into the third rail 3. In the open position of the pull-out guide the first rail 1 has its extracted position in which it is completely extracted from the second rail 2 and the second rail 2 has its extracted position in which it is completely extracted from the third rail 3.

[0041] The securing part 14 is mounted in the region of the front end of the second rail 2 on a base part of the second rail 2 (which in particular is configured as a metal profile) so as to be rotatable about an axis of rotation 15 at right angles to the pull-out direction 6. In the blocked position of the securing part 14, which is shown in FIGS. 1, 2, 6, 7, 10, 17, 18 and 26, a lifting of the front end of the first rail 1 is blocked by the securing part 14 (apart from some play) whereby a contact surface 14a of the securing part 14 cooperates with a support surface 1b of the first rail 1. In the exemplary embodiment the support surface 1b of the first rail 1 is formed by the upper side of a horizontal web 1c of the first rail 1. In particular, the upper side of this horizontal web 1c forms the track for cooperation with the support roller 8 and the underside of this horizontal web 1c forms the track 1a for cooperation with the differential roller 7.

[0042] In a side view seen in a direction parallel to the axis of rotation 15 (cf. in particular FIGS. 14 and 15), the securing part 14 has an external contour which in the region of the contact surface 14a has a greater distance a from the axis of rotation 15 than in regions adjacent to the contact surface 14a. It could also be said that the securing part 14 is mounted eccentrically so as to be rotatable about the axis of rotation 15.

[0043] If the securing part 14, starting from the blocked position, is twisted in an opening direction of rotation in the direction of the release position about the axis of rotation 15, this twisting is accomplished against the retaining force of a spring element 16. In the exemplary embodiment, the spring element 16 is formed in one part, in particular in one piece of material with the securing part 14. In this case, the spring element 16 is formed by a band-shaped portion of the securing part 14 which runs in a curved manner, wherein the securing element 14, at least in this section, consists of an elastic material, in particular elastic plastic. The spring element 16 therefore starts from a main part of the securing part 14 and is released with respect to this. The end of the spring element 16 remote from the main part of the securing element 14 is supported on the second rail 2, for example, whereby a pin-shaped projection of the spring element 16 engages in a bore in the second rail 2.

[0044] The securing part 14 and the spring element 16 can also comprise different materials, even in a one-piece material configuration. The spring element 16 could thus, comprise a plastic, for example, that differs from the securing part and/or a spring element could be injection-moulded from metal.

[0045] If the securing part 14 is twisted about the axis of rotation 15 starting from the blocked position into the release position, a snap connection between the securing part 14 and the second rail 2 is automatically closed, which the securing part 14 holds against the force of the spring element 16 in the release position. The release position of the securing part 14 can be seen from FIGS. 11, 19, 20, 21, 23, 27 and 28. The snap connection thus forms a holding device wherein in the closed state of the snap connection the holding device has a holding state and in this state holds the securing part 14 twisted into the release position in the release position. When twisting the securing part 14 from the blocked position into the release position, the holding state is automatically adopted by the holding device.

[0046] In order to form the snap connection, in the exemplary embodiment the securing part 14 has an elastic tongue 17 which has a locking tab 18. In the closed state of the snap connection the locking tab 18 is snapped into the second rail 2 (directly into the main part of the second rail configured as a metal profile or into a part connected to this) and cooperates with a retaining surface 2a of the second rail 2. In the exemplary embodiment the locking tab 18 is snapped into the front end of an upper horizontal web 2b of the second rail 2 and the retaining surface 2a is formed in the region of the upper side of the front end of the upper horizontal web 2b. This upper horizontal web 2b is a section of a main part which in particular is a metal profile, of the second rail 2. Instead, a connecting part could also be disposed on the main part, in particular metal profile, of the second rail 2, with which the locking tab 18 of the tongue 17 of the securing part 16 cooperates.

[0047] The complete removal of the first rail 1 starting from the closed position of the pull-out guide is explained by reference to FIGS. 17-19. If, starting from the closed position of the pull-out guide shown in FIG. 17, in which the first and second rail 1, 2 have their inserted position, the first rail 1 is pulled out and in so doing, at the same time the second rail 2 moves out from the third rail 3, the pulling out of the first rail 1 in the extracted position of the first and second rail 1, 2 is delimited by the stop element 13 of the first rail 1 striking the pull-out stop 12 of the second rail 2, as shown in FIG. 18. In order to enable the first rail 1 to hang out, the securing part 14 is twisted by the user from the blocked position into the release position wherein the snap connection snaps in between the securing part 14 and the second rail 2. The front end of the first rail 1 can now be raised and the stop element 13 can be moved over the pull-out stop 12 past this in the pull-out direction, cf. FIG. 19. The first rail 1 can now be completely removed from the second rail 2.

[0048] Insertion of the first rail 1 completely removed from the second rail 2 into the second rail 2 is shown in FIGS. 20 to 22. When the first rail 1 is inserted into the second rail 2, the second rail 2 is preferably located in the inserted position in the third rail 3, cf. FIG. 20. In FIG. 20 the securing part 14 is shown before insertion of the first rail 1 in the release position. It can be brought into this position in advance by the user. In the region of its longitudinal extension in which the securing part 14 is located in the inserted position of the second rail 2, the upper horizontal web 3b of the third rail 3 has a clearance 19 for receiving the end portion of the elastic tongue 17, as can be seen in particular from FIG. 23. In the exemplary embodiment this clearance 19 is configured as an upward protrusion of the upper horizontal web 3b, whereby a receiving space is formed underneath this protrusion in the end portion of the elastic tongue 17 lies.

[0049] The first rail 1 can now be inserted into the second rail 2. For this purpose, the front end of the first rail 1 is raised, cf. FIG. 21, i.e. in the horizontal position of the second rail 2 the first rail 1 lies obliquely with respect to the horizontal. In this state, the stop element 13 can be moved past the pull-out stop 12 contrary to the pull-out direction 6. FIG. 21 specifically shows the state in which the rear end of the first rail 1 reaches the gap between the differential roller 7 and the support roller 8 located thereabove. If the first rail 1 in this position is inserted further into the gap between the differential roller 7 and the support roller 8, this has the result that the second rail 2 is raised somewhat with respect to the third rail 3 enlarging this gap between the differential roller 7 and the support roller 8 (the differential roller 7 has some play in the vertical direction). As a result, the free end of the elastic tongue 17 is pressed against the upper horizontal web 3b of the third rail 3 and the tongue 17 is bent, with the result that the locking tab 17 can come out of engagement with the retaining surface 2a of the second rail 2. This is in particular apparent from the enlarged section of FIG. 24. The snap connection is thus opened. When the front end of the first rail 1 is lowered after travel of the stop element 13 over the pull-out stop 12, the spring element 16 turns the securing part 14 about the axis of rotation 15 from the release position into the blocked position. The first rail 1 can further be inserted completely into the second rail 2 until it occupies the inserted position.

[0050] Should the snap connection of the securing part 14 not have been opened during insertion of the first rail 1 into the second rail 2 (since the second rail 2 has not been raised sufficiently or the free end of the tongue 17 has not been or has not been pressed in sufficiently strongly), the snap connection is opened when the pull-out guide is pulled out from the closed position the next time. In the closed position of the pull-out guide, the second rail 2 and the third rail 3 and the securing part 14 located in the release position would occupy the state as shown in FIG. 23 (wherein in addition the first rail 1 would also be located in the inserted position). If during opening of the pull-out guide, the second rail 2 now moves with respect to the third rail 3 in the pull-out direction 6, in the region of the front end of the clearance 19 the free end of the resilient tongue 17 approaches the upper horizontal web 3b of the third rail 3 and is thereby pressed in. As a result of this pressing-in of the elastic tongue 17, the locking tab 18 is brought out of engagement with the retaining surface 2a and the snap connection is opened. The spring element 16 then twists the securing part 14 from the release position into the blocked position.

[0051] If, in the open position of the pull-out guide, i.e. when the first and second rail 1, 2 are located in the extracted positions, the securing part 14 should be located in the release position, during closure of the pull-out guide an opening of the snap connection takes place automatically and thus an adjustment of the securing part 14 from the release position into the blocked position. And specifically for this purpose, in the region of its free end shortly before reaching the inserted position of the second rail 2, the elastic tongue 17 approaches the front end of the upper horizontal web 3b of the third rail 3, cf. FIG. 25. The resilient tongue 17 is thereby pressed in and the locking tab 18 is brought out of engagement with the retaining surface 2a. The spring element 16 then turns the securing part 14 into the blocked position.

[0052] In the exemplary embodiment a manual twisting of the securing part 14 from the blocked position into the release position can be omitted for insertion of the first rail 1 into the second rail 2, as is explained with reference to FIG. 26 to 28. During insertion here the first rail 1 approaches the side surface 14b of the securing part 14 which points in the pull-out direction 6 in the blocked position of the securing part 14. This side surface 14b is configured to be indented and rippled with horizontally running indentations 20. The rear end of the first rail 1 thereby hooks into these structures of the side surface 14b and during insertion of the first rail 1 twists the securing part 14 into the release position in which the snap connection snaps in, cf. FIG. 27. Then as described previously the first rail 1 can be inserted into the second rail 2 with raised front end.

[0053] If an attempt is made to raise the first rail 1 in the blocked position of the securing part 14 with its front end, a force is applied to the stop surface 14a of the securing part 14 which acts at least substantially perpendicularly upwards. As a result of the position of the contact surface 14a relative to the axis of rotation 15, a force acting perpendicularly upwards on the contact surface 14a results in a torque applied to the securing part 14 which acts contrary to the opening direction of rotation. It could also be said that the securing part 14 in the blocked position in relation to the support surface 1b of the first rail 1 has been twisted over the dead point contrary to the opening direction about the axis of rotation 15. In this case, a stop 14c of the securing part is pressed against a stop surface 2c arranged on the second rail 2 (indicated in FIG. 11), with the result that this torque is supported. The spring element 16 therefore does not need to hold the securing part 14 in the blocked position with such a force acting on the securing part 14.

[0054] For rotatable connection of the securing part 14 to the main part of the second rail 2, in the exemplary embodiment an axle pin 14d of the securing part 14 is inserted through an opening in the main part of the second rail and staked. FIGS. 14 to 16 show the axle pin 14d as it is configured before insertion of the securing part 14 and staking. The staked end of the axle pin 14d can be seen in FIG. 7.

[0055] Instead, a twistable connection of the securing part 14 with the main part of the second rail 2 could be made in a different manner, for example by riveting or screwing.

[0056] Various modifications of the exemplary embodiment described are feasible and possible without departing from the scope of the invention as defined in the claims.

[0057] For example, the clearance 19 could also comprise an opening in the upper horizontal web 3b of the third rail 3 or be formed overall by such an opening.

[0058] The snap connection between the securing part 14 and the second rail 2 could also be formed in a different manner. It would fundamentally also be feasible and possible that an elastic snap element is disposed on the second rail 2 which snaps into a contact surface 14a of the securing part 14 in the release position of the securing part 14.

[0059] Instead of a snap connection a holding device configured in a different manner could also be provided which, in a holding state, holds the securing part twisted into the release position in the release position and preferably automatically adopts the holding state during twisting of the securing part from the blocked position into the release position. For this purpose, for example, a spring element initially counteracts a twisting of the securing part 14 from the blocked position in the direction of the release position could be brought over a dead point so that in the release position of the securing part the spring element exerts a torque on the securing part which acts in the opening direction of rotation and presses a stop of the securing part against a counter-stop of the second rail.

[0060] The pull-out guide could fundamentally be configured in a different manner than in the form of a differential pull-out guide. Thus, it could also be provided that the pull-out guide comprises only a first rail and a second rail, wherein the second rail is to be attached to the furniture carcass and could also be designated as carcass rail and the first rail is to be attached to the extractable furniture part and could also be designated as pull-out rail.

REFERENCE LIST

[0061] 1 First rail [0062] 1a Track [0063] 1b Support surface [0064] 1c Horizontal web [0065] 2 Second rail [0066] 2a Retaining surface [0067] 2b Upper horizontal web [0068] 2c Stop surface [0069] 3 Third rail [0070] 3a Track [0071] 3b Upper horizontal web [0072] 4 Furniture carcass [0073] 5 Extractable furniture part [0074] 6 Pull-out direction [0075] 7 Differential roller [0076] 8 Support roller [0077] 9 Roller [0078] 10 Roller [0079] 11 Auxiliary roller [0080] 12 Pull-out stop [0081] 13 Stop element [0082] 14 Securing part [0083] 14a Contact surface [0084] 14b Side surface [0085] 14c Stop [0086] 14d Axle pin [0087] 15 Axis of rotation [0088] 16 Spring element [0089] 17 Tongue [0090] 18 Locking tab [0091] 19 Clearance [0092] 20 Indentation