DIFFERENTIAL PULL-OUT GUIDE

Abstract

The invention relates to a differential pull-out guide (1) for pull-out furniture parts, having a body rail (3) that can be attached to a furniture body, a pull-out rail (4) that can be attached to a pull-out furniture part and a middle rail (5) arranged between the body rail (3) and the pull-out rail (4) in accordance with claim 1, characterised in that a lateral guide roller (13) of the middle rail (5) is arranged in the pull-out path (14) on the middle rail (5) in such a way that it is in contact with a rear end region (16) of the pull-out rail (4) in the open position.

Claims

1. A differential pull-out guide (1) for pull-out furniture parts, with a body rail (3) able to be mounted on a furniture body, a pull-out rail (4) configured to be mounted on a pull-out furniture part, and a middle rail (5) arranged between the body rail (3) and the pull-out rail (4), wherein the body rail (3) has an upper track (6) and a lower track (7), wherein the pull-out rail has an upper track (6) and a lower track (7), wherein the middle rail (5) comprises upper rollers (8), lower rollers (9) and a differential roller (10), wherein these rollers (8,9,10) respectively feature an upper contact point (11) and a lower contact point (12), wherein the upper rollers (8) of the middle rail (5) run in the upper track (6) of the body rail (3) and contact the latter with their upper contact points (11), and the lower rollers (9) of the middle rail (5) run in the lower track (7) of the body rail (3) and contact the latter with their lower contact points (12), wherein the upper rollers (8) of the middle rail (5) contact the upper track (6) of the pull-out rail (4) respectively with their lower contact points (12), and the lower rollers (9) of the middle rail (5) contact the lower track (7) of the pull-out rail (4) respectively with their upper contact points (11), wherein the differential roller (10) of the middle rail (5) runs in the lower track (7) of the body rail (3) and contacts the latter with its lower contact point (12), wherein the differential pull-out guide (1) is able to be taken along a pull-out path (14) in a pull-out direction (15) from a closed position, in which the rails (3,4,5) are pushed together maximally, into an open position in which the rails (3,4,5) are pulled apart maximally, wherein the open position is an over pull-out of the pull-out rail (4), so that a rear end (17) of the pull-out rail (4) is situated beyond the differential roller (10) and an upper roller (8) associated with the differential roller (10), wherein the middle rail (5) is configured shorter than the body rail (3) and shorter than the pull-out rail (4), wherein a rear end of the middle rail (5) in the closed position is offset forward with respect to a rear end of the body rail (3) and the rear end (17) of the pull-out rail (4), and wherein a lateral guide roller (13) of the middle rail (5) is arranged in the pull-out path (14) on the middle rail (5) in such a way that in the open position it is touching a rear end region (16) of the pull-out rail (4) at least in the position of use.

2. The differential pull-out guide (1) according to claim 1, wherein the middle rail (5) comprises a lower front roller (9) in a front end region, and a lower rear roller (9) in a rear end region of the middle rail (5) in such a way that the front roller (9) contacts the pull-out rail (4) in the open position, and the rear roller (9) contacts the pull-out rail (4) in the closed position respectively spaced apart from a front or respectively rear end of the pull-out rail (4).

3. The differential pull-out guide (1) according to claim 1, wherein the middle rail (5) comprises a front upper roller (8), having a rotation axis arranged in front of a rotation axis of the lateral guide roller (13) when viewed along the pull-out path (14).

4. The differential pull-out guide (1) according to claim 1, wherein sides of the circumferences of the upper roller (8) and of the lateral guide roller (13) assigned to one another are spaced apart from one another here radially less than 5 cm.

5. The differential pull-out guide (1) according to claim 1, wherein a further lateral guide roller (13) is provided, which is touching the rear end (16) of the pull-out rail (4) in open position.

6. The differential pull-out guide (1) according to claim 1, wherein the lateral guide rollers (13, 13, 13) are structurally identical, and the rollers (8,9) are structurally identical with respect to one another.

Description

[0025] FIG. 1 shows a differential pull-out guide 1 according to the invention, in a closed position. The side of the differential pull-out guide 1 pointing to a furniture part which is able to be pulled out can be seen. A body rail 3 has a main surface 18, on which two secondary surfaces 19, 20 are arranged. The upper secondary surface 19 has an upper track 6, the lower secondary surface 20 has a lower track 7.

[0026] A middle rail 5 runs in the body rail 3 on its upper rollers 8 and lower rollers 9. The middle rail 5 has a differential roller 11. This transfers a portion of the load of the pull-out rail 4 directly to the corpus rail 3. The differential roller 10 preferably has a play in vertical direction. The middle rail 5 has, in the region above the differential roller 10, an upper roller 8, offset somewhat forward with respect to the latter, which upper roller in the open position supports the rear end of the pull-out rail 4 against a pivoting upward.

[0027] The pull-out rail 4 runs between lower contact points 12 of the upper rollers 8 and upper contact points 11 of the lower rollers 9 of the middle rail 5, and is thus guided between these (see FIG. 3). It has a main and a secondary surface 18, 19, the latter carries the two tracks 6, 7 of the pull-out rail (see FIG. 3). The pull-out furniture part which is to be fastened would be fastened directly on the main surface of the pull-out rail 4, however this could also have a lower horizontal web as second secondary surface, on which the pull-out furniture part would then lie in a fastened manner.

[0028] In the closed position, the rails 3,4,5 are pushed together maximally, wherein the front ends of these rails are aligned. The middle rail 5 is configured shorter than the other two rails and thus leaves a space at the rear end in particular for an automatic retraction device. Fastening possibilities 21 can be seen in the pull-out rail 4 and in the body rail 3, which are configured primarily as through-openings with or without an internal thread, and which serve for the fastening of a pull-out furniture part on the pull-out rail 4 and the differential pull-out guide on a furniture body. The furniture parts are not illustrated.

[0029] FIG. 2 shows a differential pull-out guide 1 according to the invention in its open positionthe over pull-outwith maximally pulled-apart rails 3, 4, 5. In the part of the body rail 3 illustrated on the right, the components such as stop means for path delimitation, self-retraction means, blocking devices, etc., are situated, which are initially not relevant for the invention and are therefore not described more closely.

[0030] In the middle rail 5, the differential roller 10 can be seen, which runs in the lower track 7 of the body rail 3. In the open position, the lower contact point 12 of the differential roller 10 is situated at a front end of the lower track 7 of the body rail 3. An upper roller 8 is associated with the differential roller 10. This upper roller contacts with its lower contact point 12 the upper track of the pull-out rail 4 and, with its upper contact point 11, the upper track 6 of the body rail 3 at its end. The differential roller 10 and associated upper roller 8 define for the pull-out rail 4 the position of the normal pull-out, in which the rear end of the pull-out rail 4 is situated between both rollers.

[0031] It can be further seen that the lower roller 9 of the middle rail 5, contacting the pull-out roller 5 further forward, contacts this in the region between the rear end of the pull-out rail and its centre, preferably rather in the region of its longitudinal centre. This increases the load bearing capability of the differential rail according to the invention. The front stops, which prevent a further pulling out of the pull-out rail 4, can not be seen in FIG. 2. The middle rail 3 has the lateral guide roller 13 according to the invention, which enables a lateral guidance of the pull-out rail 4 in the last region of the pull-out path before and on reaching the open position. A further assisting roller 13 can be provided between the lateral guide roller 13 according to the invention and the front lower roller 9 (see FIG. 3).

[0032] Provision is made that over preferably 100% of the pull-out path, always at least one lateral guide roller 13, 13 and 13 is operative, at least however over the last 10% in the region of the open position. Preferably, two lateral guide rollers are operative over 100% of the pull-out path.

[0033] FIG. 3 shows an individual illustration of the three rails 3, 4 and 5 with the previously mentioned features. It can be seen that the middle rail 5 consists of a canted profile, on which the rollers 8,9 are fastened in a mounted manner, in particular mounted on one side. In this embodiment, the pull-out rail 4 and the body rail 3 are of equal length. In the closed position, they terminate flush with one another both at their front ends and also at their rear ends. It would also be conceivable to configure the body rail 3 to be shorter than the pull-out rail 4, so that the latter, in the closed position, would be offset forward with respect to the rear end of the pull-out rail.

[0034] The two lateral guide rollers 13, 13 are particularly relevant, of which the rear lateral guide roller 13, illustrated on the left side, is essential to the invention. This ensures the secure lateral guidance of the pull-out rail 4 in the last region of the pull-out path 14 on-load, preferably assisted by the one situated axially before. on-load means, vice versa, that the pull-out rail and the middle rail of the differential pull-out guide according to the invention in the non-installed state are connected to one another so loosely and with so much play that the pull-out rail does not necessarily always have to touch the lateral guide roller 13 according to the invention, however always does this on-load, therefore in the installed state with a fastened and in particular laden drawer.

[0035] The three lateral guide rollers 13, 13 and 13 ensure as a whole a lateral guidance of the pull-out rail 4 over the entire pull-out path. Owing to its arrangement, the lateral guide roller 13 which is essential to the invention leads to the pull-out rail 4 not being able to contact the middle rail with the formation of a frictional engagement. This prevents the shared, rigid displacing of both rails, mentioned in the introduction, so that the desired differential function is always able to be carried out.

[0036] On the right-hand side in the region of the upper rollers 8, the middle rail 5 also has a stop means 22, however this is not in accordance with the invention and is therefore not described further. In turn, the fastening possibilities 21 can be seen in the body rail 3 under the pull-out rail 4, which serve for fastening the invention on a body and on a pull-out furniture part, such as a drawer.

[0037] FIG. 4 shows a position of the differential pull-out guide 1 according to the invention in the normal pull-out position, in which the differential effect begins or respectively ends. A rear end 17 of the pull-out rail 4 lies between the differential roller 10 and the upper rollers 8 associated therewith. In an insertion direction, the pull-out rail 4 will cover twice the path of the middle rail 5. In the detail views marked by the letters A, B, the lying of the differential roller 10 on the lower track 7 of the body rail 3 and the lying of the associated upper rollers 8 on the upper track of the pull-out rail 4 are illustrated. An inlet bevel 24 of the pull-out rail 4 can also be seen.

[0038] FIG. 5 shows the open positionthe over pull-outof the differential pull-out guide 1 according to the invention. In this position, an upper roller 8 of the middle rail 5 contacts a rear end region of the upper track of the pull-out rail 4, which according to the invention is also contacted by the assisting roller 13. The partially cut detail illustration B clearly shows in the enlargement 3:1 that the lateral guide roller 13, just as the other lateral guide rollers, has a rotation axis, tilted by 90, compared to the rotation axes of the upper rollers 8, thereby it is aligned parallel to a main surface of the middle rail 5. The lateral guide roller 13 and the additional assisting roller 13 in the detail illustration A thereby contact a main surface of the pull-out rail 4. The assisting roller 13 according to the invention additionally ensures that the pull-out rail 4 is always moved coaxially to the middle rail 5 and no angle forms between the two, which would lead to a canting of the pull-out rail 4.

[0039] In FIG. 6 there is shown finally the installation situation of the assisting roller 13, which is in accordance with the invention and relevant to the invention, from a perspective view from below.

[0040] It can be seen that the middle rail 5 has a recess 25 through which the lateral guide roller 13 passes. Furthermore, two fastening openings 26 can be seen for the mounting of a lateral guide roller mount 27, into which the latter is held in a force-fitting or form-fitting manner. The lateral guide roller mount 27 contains the axle bearings of the lateral guide roller 13.

[0041] Provision is advantageously made that all the lateral guide rollers 13, 13 and 13 are configured identically in construction, in particular consist of the same material, which on the one hand simplifies the warehousing and the exchange, and on the other hand entails uniform rolling characteristics. The lateral guide roller 13 is relevant in particular for the avoidance of the disadvantages on over pull-out, however its effect is amplified in further development of the invention through the lateral guide roller 13.

List of Reference Numbers

[0042] 1 differential pull-out guide [0043] 2 [0044] 3 body rail [0045] 4 pull-out rail [0046] 5 middle rail [0047] 6 upper track [0048] 7 lower track [0049] 8 upper roller [0050] 9 lower roller [0051] 10 differential roller [0052] 11 upper contact point [0053] 12 lower contact point [0054] 13 lateral guide roller [0055] 14 pull-out path [0056] 15 pull-out direction [0057] 16 [0058] 17 rear end pull-out rail [0059] 18 main surface body rail [0060] 19 upper secondary surface [0061] 20 lower secondary surface [0062] 21 fastening possibilities [0063] 22 stop means [0064] 23 [0065] 24 [0066] 25 recess [0067] 26 fastening opening [0068] 27 lateral guide roller mount