EP4044869B1

EP4044869B1 - Telescopic guide for drawer

Info

Publication number: EP4044869B1
Application number: EP20807496.3A
Authority: EP
Inventors: Giovanni Ronda
Original assignee: Ronda SpA
Current assignee: Ronda SpA
Priority date: 2019-10-17
Filing date: 2020-10-16
Publication date: 2023-11-01
Anticipated expiration: 2040-10-16
Also published as: WO2021074885A1; EP4044869A1; ES2971701T3; IT201900019184A1

Description

The present invention relates to a telescopic guide for drawers.
The guides for drawer are used to support the weight of the drawers and at the same time to allow and facilitate the sliding thereof to and from an external support structure such as for example a piece of furniture for kitchens or furnishing.
The need is felt to reduce the dimensions of these guides, in order to make furnishing more compact and at the same time maximize the capacity of the drawers. A further need felt consists in giving the possibility of full access to the drawer, extracting it almost completely from the piece of furniture.
For these reasons, it is common to use telescopic guides, i.e. extendable guides formed by two or more elements that slide into one another so as to move the guides between a closed position in which the drawer is retracted in a piece of furniture to an extended position in which the drawer is open.
Said telescopic guides must rigidly support the drawers to which they are fixed, and must minimize friction in the sliding direction of the drawer in the piece of furniture. Furthermore, the need is felt to realize a guide that is relatively cheap to manufacture and simple to assemble, and at the same time robust and durable over time.
In this context, the invention is most suitably placed in the furnishing sector for catering structures and professional kitchens, in which the telescopic guides are required to be arranged laterally to the drawers. Furthermore, in this context it is desirable that the telescopic guides can be disassembled to allow frequent maintenance and cleaning of said drawers and of the guides themselves.
It is known the use of rollers interposed between the elements of the telescopic guide in order to facilitate the sliding of the guide itself. However, under certain conditions, such as for example in the case of a lateral impact against the drawer, the presence of non-pivoted rollers can cause lateral derailing of one or more elements of the telescopic guide from their sliding channel in the guide itself. Said derailing known in the jargon as "slip off" interrupts the correct functioning of the telescopic guide.
To obviate this drawback, the use of opposing rollers has been proposed. However, this solution entails a considerable lateral overall dimension of the guide, which must therefore be placed under the drawer instead of to the side of the drawer. Consequently, this solution is unsuitable for the catering and professional kitchen sector.
Examples of known guides are disclosed in DE 25 36 743 A1 or AT 361 171 B .
The technical problem underlying the present invention is therefore that of providing a telescopic guide for drawers that is structurally and functionally conceived to at least partially obviate one or more of the drawbacks complained of with reference to the cited prior art.
Within the scope of this problem, the main object of the present invention is to realise a telescopic guide which is particularly suitable for being mounted on the sides of the drawer.
A further object is to provide a drawer which is resistant to possible lateral impacts avoiding, or in any case minimizing, the risk of derailings.
It is also an object of the present invention to provide a telescopic guide which can be easily disassembled for periodic cleaning and any maintenance.
This problem is solved by the invention and these and other objects are achieved by means of a telescopic guide for drawer realised in accordance with the attached claims.
According to the invention, this problem is solved by realising a telescopic guide for a drawer of a piece of furniture, comprising a base support, a floating support, and a plurality of grooved rollers.
The base support can be fixed to the side of the piece of furniture and comprises a pair of base rails, said pair of base rails comprising an upper base rail and a lower base rail.
Advantageously, the floating support is interposed between the upper base rail and the lower base rail so as to reduce the lateral overall dimension of the telescopic guide.
The floating support comprises a pair of floating rails, said pair of floating rails comprising an upper floating rail and a lower floating rail.
The plurality of grooved rollers comprises at least three grooved rollers, divided between upper rollers and lower rollers, which are interposed between said pair of base rails and said pair of floating rails.
Preferably, the upper grooved rollers are interposed between the upper base rail and the upper floating rail, while the lower grooved rollers are interposed between the lower floating rail and the lower base rail.
The grooved rollers have respective horizontal rolling axes perpendicular to a sliding direction of the telescopic guide. In this way, a rolling of said grooved rollers about the respective horizontal rolling axes advantageously allows relative sliding between the floating support and the base support in parallel with said sliding direction. Each base rail and each floating rail comprise a sliding surface, preferably convex, which extends in parallel with said sliding direction. Furthermore, each grooved roller comprises a peripheral groove which is configured to match to a respective sliding surface. Advantageously, this expedient limits a lateral play between said peripheral groove and said respective sliding surface. According to a further advantageous aspect, the grooved rollers have a minimum lateral overall dimension.
The characteristics and the advantages of the invention will become clearer from the following detailed description of a preferred but not exclusive embodiment thereof illustrated, by way of non-limiting example, with reference to the accompanying drawings in which:

Fig. 1 is an overall perspective view of the telescopic guide in extended position according to an embodiment of the invention;
Figs. 2A and 2B are overall perspective views of the telescopic guide of Figure 1 in closed position;
Figs. 3A and 3B are a front view and an overall rear view of the telescopic guide of Figure 2A, respectively;
Figs. 4A and 4B are a sectional view according to the line IVA-IVA and a sectional view according to the line IVB-IVB of the telescopic guide of Figure 2A, respectively;
Fig. 5 is a sectional view along the line V-V of the telescopic guide of Figure 3A;
Figs. 6-12 are perspective views of details of the telescopic guide of the preceding figures;
Fig. 13 is an overall perspective view of the telescopic guide in extended position according to a further embodiment of the invention;
Figures 14 and 15 are a front view and an overall rear view of the telescopic guide of Figure 13, respectively;
Fig. 16 is a sectional view along the line XVI-XVI of the guide of Fig. 14;
Fig. 17 is a perspective view of a detail of the guide of Fig. 13 in a partially closed position.

In the figures, 100 generally indicates a telescopic guide for a drawer of a piece of furniture.
The telescopic guide 100 comprises a base support 10 and a floating support 20, shown in Figure 1 in the extended position and in Figure 2A in the closed position. The base support 10 can be fixed to the side of the piece of furniture and comprises a pair of upper and lower base rails 11, 12, respectively.
Advantageously, the floating support 20 is interposed between the upper base rail 11 and the lower base rail 12 so as to reduce the lateral overall dimension of said telescopic guide 100, i.e. the overall dimension occupied by said telescopic guide 100 in a horizontal direction transversal to a sliding direction X of said telescopic guide 100.
Similarly, the floating support 20 comprises a pair of upper and lower floating rails 21, 22 respectively.
The telescopic guide 100 also comprises a plurality of grooved rollers which are interposed between said pair of base rails 11, 12 and said pair of floating rails 21, 22.As will be illustrated in greater detail below, the presence of at least three grooved rollers is required to allow a linear sliding of the floating support 20 with respect to the base support 10. However, it may be preferable to use a higher number of grooved rollers to increase load distribution.
As mentioned above, the grooved rollers comprise at least one upper grooved roller 1 which is interposed between the upper base rail 11 and the upper floating rail 21 and at least one lower grooved roller 2 which is interposed between the lower floating rail 22 and the lower base rail 12, the upper grooved roller 1 and the lower grooved roller 2 being preferably substantially equal to each other.
Furthermore, on the basis of what has been illustrated above, at least one additional grooved roller is provided to be selected from an additional upper planar roller 1 which is interposed between the upper base rail 11 and the upper floating rail 21 or an additional lower planar roller 2 which is interposed between the lower floating rail 22 and the lower base rail 12.
An embodiment of the grooved rollers 1, 2 is shown in Fig. 10.The grooved rollers 1, 2 have respective horizontal rolling axes H which are perpendicular to the sliding direction X of the telescopic guide 100 so that a rolling of the grooved rollers 1, 2 about the respective horizontal rolling axes H allows relative sliding between the floating support 20 and the base support 10 in parallel with said sliding direction X. Advantageously, the presence of at least three grooved rollers 1, 2 which are interposed between the base rails 11, 12 and the floating rails 21, 22 prevents a rotation of the floating support 20 with respect to the base support 10 about an axis parallel to the horizontal rolling axes H.
Each of the base rails 11, 12 and of the floating rails 21, 22 comprise a sliding surface 23, preferably convex, which extends in parallel with said sliding direction X. In other words, the sliding surface 23 is formed by a convexity in relief with respect to a lateral portion of the respective rail.
Each of the grooved rollers 1, 2 comprises a peripheral groove 3 which is configured to match to a respective convex sliding surface 23 so as to limit lateral play, i.e. in a direction parallel to the rolling axis, between the peripheral groove 3 and said respective sliding surface 23.
According to a further advantageous aspect, the coupling between the grooved rollers 1, 2 and the respective sliding surfaces 23 prevents, or in any case significantly limits, a derailing (also called "slip off") of the floating support 20 from its operating position in the fixed support 10 in the event of a lateral impact against the telescopic guide 100 or against the drawer supported by it.
Preferably, the grooved rolls 1, 2 are substantially axially symmetrical with respect to their respective horizontal rolling axes H. In preferred embodiments, the peripheral groove 3 can be axially symmetrical with respect to the horizontal rolling axes H of the grooved rollers 1, 2.
Preferably, as shown in Fig. 4A the peripheral groove 3 defines a substantially H-shaped contour at any section 30 of the grooved rollers 1, 2 which are intersected by any plane which passes through the horizontal rolling axis H of the grooved rollers 1, 2.
In one aspect, the base support 10 can be fixed to the lateral wall of a piece of furniture by means of fixing means such as screws or rivets. The fixing means can pass through a pair of fixing holes 19 provided in a lateral wall 18 of the base support 10.In the condition in which the telescopic guide 100 is closed, the fixing holes 19 can be advantageously accessible through a pair of through holes 29 provided in a lateral wall 28 of the floating support 20.
According to a further advantageous aspect, the telescopic guide 100 comprises a bracket 40 which can be fixed to the drawer which extends telescopically from the base 10 and floating supports 20.The bracket 40 in turn comprises a pair of upper and lower abutment surfaces 41, 42, respectively, which are mutually opposing and extending in parallel with the sliding direction X.
Advantageously, the pair of abutment surfaces 41, 42 is interposed between the upper floating rail 21 and the lower floating rail 22 so as to reduce the lateral overall dimension of the telescopic guide 100.
In some preferred embodiments, the bracket 40 has an L-shaped cross section visible in Fig. 3A.Said L-shaped cross section comprises the abutment surfaces 41, 42 on a -in use- horizontal plane, and also a vertical surface 43 which is configured to be fixed to a lateral wall of a drawer.
Advantageously, planar rollers 51, 52 are provided, also in this case preferably in a number equal to at least three which are interposed between the floating support 20 and said bracket 40.
Similarly to what is illustrated with reference to the grooved rollers, the planar rollers 51, 52 comprise at least one upper planar roller 51 which is interposed between the upper floating rail 21 and the upper abutment surface 41 and at least one lower planar roller 52 which is interposed between the lower abutment surface 42 and the lower floating rail 22, the upper planar roller 51 and the lower planar roller 52 preferably being substantially equal to each other.
In addition, at least one additional planar roller is provided to be selected from an additional upper planar roller 51 which is interposed between the upper floating rail 21 and the upper abutment surface 41 or an additional lower planar roller 52 which is interposed between the lower abutment surface 42 and the lower floating rail 22. An embodiment of the planar rollers 51, 52 is shown in Fig. 11.The planar rollers 51, 52 have respective horizontal rolling axes H' which are perpendicular to the sliding direction X. In this way, a rolling of the planar rollers 51, 52 about the respective horizontal rolling axes H allows relative sliding between said bracket 40 and the floating support 20 in parallel with said sliding direction X.
According to a further advantageous aspect, each of the floating rails 21, 22 comprises a sliding surface 24 which is opposite a respective sliding surface 23, and each of the planar rollers 51, 52 comprises a rolling surface 54 which is configured to engage in a respective sliding surface 24, as shown in Fig. 3A.Advantageously, the sliding surface 24 of the floating rails 21, 22 has a shape which is complementary with respect to the surface 23, said sliding surfaces preferably being the former concave and the latter convex. Similarly, the rolling surface 54 of the planar rollers 51, 52 preferably has a shape which is complementary with respect to the sliding surface 24 of the floating rails 21, 22. Also in this case it is therefore possible to have convex and concave surfaces, respectively. This expedient prevents lateral play between the convex rolling surface 54 and the respective concave sliding surface 24. It will also be appreciated that also in this case the term concave surface and convex surface is intended to indicate a surface which forms a concavity or a convexity, respectively, with respect to a corresponding adjacent portion.
Preferably, at least one lateral roller 6 is interposed between the floating support 20 and the bracket 40. An embodiment of the lateral roller 6 is shown in Fig. 12.
The lateral roller 6 has a vertical rolling axis V so that a rolling of the lateral roller 6 about the vertical rolling axis V allows relative sliding between the floating support 20 and the bracket 40 in parallel with the sliding direction X. Advantageously, the at least one lateral roller 6 facilitates the sliding of the bracket 40 along the floating support 20 in the presence of a horizontal load transversal to said sliding direction X. In one aspect, a first runner 7 is provided which is interposed between the base support 10 and the floating support 20 so as to secure the floating support 20 for translational movement with respect to the base support 10 in the sliding direction X.
The first runner 7 is secured for translational movement with respect to the base support 10 in said sliding direction X. The first runner 7 comprises an upper cage 71 which is configured to define a position of the upper grooved rollers 1 and a lower cage 72 which is configured to define a position of the lower grooved rollers 2. Preferably, the first runner 7 further comprises a structural connection 73 between the upper cage 71 and the lower cage 72.
In one embodiment, as shown in Figures 6 and 7, the upper cage 71 and the lower cage 72 comprise first sides 75 which are configured to prevent a horizontal displacement of said grooved rollers 1, 2 with respect to the first runner 7 in a direction transversal to the sliding direction X.
Advantageously, the first sides 75 are structurally connected through first partitions 76 which are configured to prevent a horizontal displacement of the grooved rollers 1, 2 with respect to the first runner 7 in a direction parallel to the sliding direction X. Preferably, as shown in Fig. 4A, the first sides 75 at their internal surfaces 75' turned towards the grooved rollers 1, 2 comprise first bulges 74.Said first bulges 74 are configured to engage in respective axial cavities 4 of the grooved rollers 1, 2 so as to prevent a radial displacement of the grooved rollers 1, 2 with respect to the first runner 7.In advantageous embodiments, the first bulges 74 and the axial cavities 4 are axially symmetrical. Preferably, the diameter of the axial cavities 4 is greater than the diameter of the first bulges 74 so as to allow radial play of the grooved rollers 1, 2.
In one aspect, the first bulges 74 allow to achieve a snap coupling, i.e. of the "snap-fit" type, between the first runner 7 and the grooved rollers 1, 2. This expedient eliminates the need to use a securing rotatable pin of the grooved rollers 1,2 and reduces the number of components so as to achieve a simple and economical coupling. Furthermore, the snap fit coupling reduces the assembly, disassembly and maintenance times of the first runner 7 and of the grooved rollers 1, 2. Advantageously, the base support 10 comprises an upper edge 13 and a lower edge 14 which extend along the upper base rail 11 and along the lower base rail 12, respectively. The upper edge 13 and the lower edge 14 are configured to limit tilting of the upper cage 71 and the lower cage 72, respectively, transversely to said sliding direction X so as to prevent a derailing of said first runner 7 from said pair of base rails 11, 12. This expedient advantageously prevents a release of the floating support 20 from the first runner 7 transversely to said sliding direction X.
According to a further advantageous aspect, a second runner 8 is provided which is interposed between the floating support 20 and the bracket 40. The second runner 8 is configured to define the position of the planar rollers 51, 52.
In one embodiment, as shown in Figures 8 and 9, the second runner 8 comprises second sides 85 which are configured to prevent a horizontal displacement of the planar rollers 51, 52 with respect to said second runner 8 in a direction transversal to the sliding direction X.
Advantageously, the second sides 85 are structurally connected through second partitions 86 which are configured to prevent a horizontal displacement of the planar rollers 51, 52 with respect to the second runner 8 in a direction parallel to the sliding direction X.
Preferably, the second sides 85 at their internal surfaces 85' turned towards the planar rollers 51, 52 comprise second bulges 84 which are configured to engage in respective axial cavities 53 of the planar rollers 51, 52 so as to prevent a vertical displacement of the planar rollers 51, 52 with respect to the second runner 8. In advantageous embodiments, the second bulges 84 and the axial cavities 53 are axially symmetrical. Preferably, the diameter of the axial cavities 53 is greater than the diameter of the second bulges 84 so as to allow radial play of the planar rollers 51, 52.
According to a further advantageous aspect, the second runner 8 comprises horizontal walls 89 which are configured to prevent a vertical displacement of the at least one lateral roller 6 with respect to said second runner 8.
Advantageously, the horizontal walls are structurally connected through lateral partitions 87 which are configured to prevent a horizontal displacement of the at least one lateral roller 6 with respect to the second runner 8 in a direction parallel to the sliding direction X.
Preferably, the horizontal walls 89 at their internal surfaces 89' turned towards the lateral roller 6 comprise second bulges 84 which are configured to engage in respective axial cavities 64 of the lateral roller 6 so as to prevent a horizontal displacement of the lateral roller 6 with respect to the second runner 8 transversely to the sliding direction X.
Preferably, the diameter of the axial cavities 64 is greater than the diameter of the second bulges 84 so as to allow radial play of the lateral roller 6.
In one aspect, the second bulges 84 allow to achieve a snap coupling, i.e. of the "snap-fit" type, between the second runner 8 and the planar rollers 51, 52 and/or the lateral roller 6.This expedient eliminates the need to use a securing rotatable pin of the planar rollers 51, 52 and/or of the lateral roller 6 and reduces the number of components so as to achieve a simple and economical coupling. Furthermore, the snap coupling reduces the assembly, disassembly and maintenance times of the second runner 8, of the planar rollers 51, 52 and/or of the lateral roller 6. Preferably, as shown in Fig. 3A, the second runner 8 comprises a tongue 81 which is configured to engage in a concave sliding surface 24 of the pair of floating rails 21, 22.The tongue 81 allows to secure the second runner 8 for translational movement with respect to the floating support 20 in the sliding direction X of the telescopic guide 100.Advantageously, the tongue 81 is resiliently deformable in order to allow inserting the second runner 8 in the floating support 20 transversely to the sliding direction X, i.e. inserting the second runner 8 laterally in the floating support 20 without having to fit the second runner 8 into the floating support 20 in the sliding direction X. If necessary, the tongue 81 is resiliently deformable in order to allow the lateral release of the second runner 8 from the floating support 20, i.e. the release of the second runner 8 from the floating support 20 transversely to the sliding direction X.
According to a further advantageous aspect, the floating support 20 comprises an internal rear wing 25 and an internal front wing 26 which are configured to delimit the path of the second runner 8 with respect to the floating support 20 in said sliding direction X under the condition in which the telescopic guide 100 is extended and under the condition in which the telescopic guide 100 is closed, respectively.
In one aspect, as shown in Fig. 5, a first stop 77 is provided which is fixedly joined to the base support 10 and is configured to delimit the path of the first runner 7 with respect to the base support 10 in the sliding direction X. The first stop 77 is removable to allow the first runner 7 to be removed from the base support 10 in parallel with the sliding direction X.
Preferably, the first stop 77 is intended to collide alternatively with a first front end stop surface 78' or with a first rear end stop surface 78" of the first runner 7 so as to stop the travel of the first runner 7 with respect to the base support 10 in the sliding direction X at a predetermined point. Preferably, the first stop 77 comprises a first block 78 intended to collide with the first front end stop surface 78'.Preferably, a first stop hole 15 is provided through one of the base rails 11, 12 which is configured to receive the first block 78.According to a further advantageous aspect, the first stop 77 comprises a hook 79 intended to collide with the first rear end stop surface 78".The hook 79 is configured to engage in a first hooking hole 15' provided in said base rail, the hook 79 being configured to fix in a removable way the first stop 77 to said base support 10.
According to a further advantageous aspect, as shown in Fig. 5, the floating support 20 comprises a pair of external wings 27 which are configured to engage on respective abutment surfaces 27' of said first runner 7 so as to stop the advancement of said floating support 20 with respect to the first runner 7 at a predetermined point. Preferably, the external wings 27 are located at one end of the floating support 20 in the sliding direction X.
In one aspect, the upper base rail 11 and the lower base rail 12 comprise an upper longitudinal groove 31 and a lower longitudinal groove 32, respectively, which extend in parallel with the sliding direction X. Furthermore, as shown in Fig. 3B, the floating support 20 comprises an upper tooth 33 and a lower tooth 34 which are configured to engage in a sliding manner in the upper longitudinal groove 31 and in the lower longitudinal groove 32, respectively, so as to prevent a derailing of the floating support 20 with respect to the pair of base rails 11, 12.Preferably, the upper tooth 33 and the lower tooth 34 extend from the upper 21 and lower 22 floating rail, respectively, in the vertical direction away from the respective rail, until they engage in the respective groove. Preferably, the upper tooth 33 and the lower tooth 34 are located at one end of the floating support 20 in the sliding direction X. According to a further advantageous aspect, the upper tooth 33 and the lower tooth 34 are molded in rigid plastic material and are configured to be keyed onto the pair of external wings 27.
In some embodiments, as shown in Fig. 5, a second stop 88 is provided which is fixedly joined to the bracket 40 and configured to delimit the path of said bracket 40 with respect to said second runner 8 in said sliding direction X.
Preferably, the second stop 88 is molded in rigid plastic material and is keyed to a keying wing 17 provided in the bracket 40.
Preferably, the second stop 88 is intended to collide alternatively with a second front end stop surface 82' or with a second rear end stop surface 82" of the second runner 8 so as to stop the travel of the bracket 40 with respect to the second runner 8 in the sliding direction X at a predetermined point.
According to a further advantageous aspect, as shown in Fig. 4B, the second runner 8 comprises a longitudinal edge 97 which extends in parallel with said sliding direction X, said longitudinal edge 97 being configured to secure the second stop 88 for sliding in the sliding direction X so as to prevent a release of the bracket 40 from the second runner 8 transversely to the sliding direction X. Advantageously, this expedient ensures that the bracket 40 remains connected in a sliding manner to the second runner 8 even in the event of a lateral impact against the telescopic guide 100.
Preferably, the second stop 88 is removable so as to allow the bracket 40 to be removed from the second runner 8 in the sliding direction X.
In one aspect, the first runner 7 and the second runner 8 slide inside the base support 10 and inside the floating support 20, respectively, so as to reduce the lateral overall dimension of the telescopic guide 100.
In one aspect, the first runner 7 and/or the second runner 8 comprise a joint 9 which is interposed between the seats of two grooved rollers 1, 2 or of the two planar rollers 51, 52, respectively. Advantageously, the joint 9 has a length in the sliding direction X which is adjustable so as to adjust a horizontal distance D between the two grooved rollers 1, 2 or between the two planar rollers 51, 52, respectively.
According to a further advantageous aspect, the joint 9 is of the telescopic type, i.e. it comprises a rod 92 which slides along a track 91 in a direction parallel to the sliding direction X so as to vary the length of the joint 9 in the sliding direction X. Preferably, the track 91 and the rod 92 comprise an internal surface 93 and an external surface 94, respectively, in contact with each other. The internal surface 93 and the external surface 94 are specularly corrugated in order to engage one on the other so as to prevent a translation of the rod 92 with respect to the track 91 unless a force is applied in the sliding direction X, said force having a value equal to or greater than a minimum pre-established threshold for adjusting the length of the joint 9. Preferably, the track 91 comprises a reading surface 95 on which a graduated scale 96 is reproduced, which is configured to allow the reading of a position of said rod 92 along the track 91.
The internal surface 93 and the external surface 94 which is specularly corrugated as well as the graduated scale 96 allow adjusting the length of said first runner 7 and/or said second runner 8 quickly and without the aid of further tools, thus facilitating the assembly and the maintenance of the telescopic slide 100.
In preferred embodiments, the base support 10, the floating support 20 and the bracket 40 are obtained by mechanical processing of a metal sheet such as for example a stainless steel sheet. Preferably, the base rails 11, 12, the floating rails 21, 22 and the abutment surfaces 41, 42 are produced by blanking and bending said metal sheet. According to a further advantageous aspect, the first runner 7 and the second runner 8 are produced by molding plastic materials. In this way, the manufacturing process of the telescopic guide 100 is advantageously quick and economical.
Advantageously, the grooved rollers 1, 2, the planar rollers 51, 52 and the at least one lateral roller 6 are made of a material such as Teflon which is configured to minimize the friction coefficient among the rollers 1, 2, 51, 52, 6 and the steel metal sheet of the base support 10, of the floating support 20 and of the bracket 40.
A more preferred example of embodiment of the invention is described below with reference to Figures 13 to 17.
In this example, the first stop 77 which delimits the path of the first runner 7 with respect to the base support 10 in the sliding direction X, is fixedly joined to the front longitudinal end 98 of the base support 10, preferably at the upper base rail 11.In this way, the first stop 77 prevents the first runner 7 from coming off the base support 10 during the extension phase of the telescopic guide 100 and the opening phase of the relative drawer.
It should be noted that, in this context, the terms "front" and "rear" refer to the opposing sides of the telescopic guide 100 turned towards the opening and closing direction, respectively, of the guide itself and of the relative drawer.
As highlighted in Fig. 17, the bracket 40 preferably comprises: the abutment surfaces 41, 42 on a - in use - horizontal plane; the vertical surface 43 which is configured to be fixed to a lateral wall of a drawer; and also a second vertical surface 44 which in use is parallel and adjacent to the lateral wall 28 of the floating support 20.
In one aspect shown in Fig. 13, the second vertical surface 44 develops along a portion of the longitudinal length of the bracket 40 comprised between the front longitudinal end 99 of the bracket 40 and the fixing point of the second stop 88. Advantageously, an anti-slip device 101 is provided, which is fixedly joined to the floating support 20 and is configured to prevent the bracket 40 from slipping off, as shown in Fig. 17.
In one aspect, the anti-slip device 101 is removably fixed to the front longitudinal end 90 of the floating support 20, preferably by means of a shape coupling.
A saddle 105 which is configured to support the lower abutment surface 42 of the bracket 40 sliding in the sliding direction X is defined in the anti-slip device 101.
Advantageously, a projection 102 develops from the saddle 105 which projection 102 is configured to engage in a sliding manner in a longitudinal slot 103 defined in the bracket 40 in the sliding direction X. In use, the projection 102 is oriented vertically so as to secure the bracket 40 for translational movement in the direction X without allowing lateral deviations of the bracket.
According to a further advantageous aspect, the anti-slip device 101 has a shoulder 104 facing the saddle 105 and configured to abut the upper profile 106 of the second vertical surface 44 of the bracket 40 during the sliding thereof in the sliding direction X.
In order to ensure a better anchoring of the anti-slip device 101 to the floating support 20, the anti-slip device 101 can include a protrusion 103 which fits into the upper floating rail 21.
The invention thus solves the proposed problem achieving numerous advantages including:

the elimination of the risk of slipping off, i.e. of the risk of a derailing of the guide transversally to the sliding direction following a lateral impact,
the reduction of the lateral overall dimension of the telescopic guide,
the reduction of the manufacturing costs of said guide,
the simplification of the guide assembly process,
a better sliding of the guide,
the possibility of at least partially disassembling the guide without having to remove it.

Claims

A telescopic guide (100) for a drawer of a piece of furniture comprising:
• a base support (10) which can be fixed to the side of said piece of furniture, said base support (10) comprising a pair of base rails (11, 12) which include an upper base rail (11) and a lower base rail (12),

• a floating support (20) comprising a pair of floating rails (21, 22) which include an upper floating rail (21) and a lower floating rail (22),

• at least three grooved rollers (1, 2) which are interposed between said pair of base rails (11, 12) and said pair of floating rails (21, 22), said grooved rollers (1, 2) having respective horizontal rolling axes (H) which are perpendicular to a sliding direction (X) of said telescopic guide (100), each of said base rails (11, 12) and of said floating rails (21, 22) comprising a sliding surface (23) which extends in parallel with said sliding direction (X), each of said grooved rollers (1, 2) comprising a peripheral groove (3) which is configured to match to a respective sliding surface (23) and in contact therewith so as to limit lateral play between said peripheral groove (3) and said respective sliding surface (23).
A telescopic guide (100) according to claim 1, wherein said peripheral groove (3) defines a substantially H-shaped contour (31) at any section (30) of said grooved rollers (1, 2) which are intersected by any plane which passes through the horizontal rolling axis (H) of said grooved rollers (1, 2).
A telescopic guide (100) according to claim 1 or claim 2, comprising:
• a bracket (40) which can be fixed to said drawer, said bracket (40) comprising a pair of abutment surfaces (41, 42) which are mutually opposing, said pair of abutment surfaces (41, 42) comprising an upper abutment surface (41) and a lower abutment surface (42), said abutment surfaces (41, 42) extending in parallel with said sliding direction (X),

• at least three planar rollers (51, 52), said planar rollers (51, 52) comprising at least one upper planar roller (51) which is interposed between said upper floating rail (21) and said upper abutment surface (41) and at least one lower planar roller (52) which is interposed between said lower abutment surface (42) and said lower floating rail (22) and at least one additional planar roller to be selected from an additional upper planar roller (51) or an additional lower planar roller (52), said planar rollers (51, 52) having respective horizontal rolling axes (H) which are perpendicular to said sliding direction (X) so that a rolling of said planar rollers (51, 52) about said respective horizontal rolling axes (H') allows relative sliding between said bracket (40) and said floating support (20) in parallel with said sliding direction (X).
A telescopic guide (100) according to the preceding claim, wherein each of said floating rails (21, 22) comprises an additional sliding surface (24) which is opposite a respective sliding surface (23), each of said planar rollers (51, 52) comprising a rolling surface (54) which is configured to engage in a respective additional sliding surface (24) so as to prevent lateral play between said rolling surface (54) and said additional respective sliding surface (24), said additional sliding surface (24) being preferably concave.
A telescopic guide (100) according to claim 4, wherein said rolling surface (54) has a shape which is complementary with respect to said additional sliding surface (24), said rolling surface (54) being preferably convex.
A telescopic guide (100) according to any one of claims 3 to 5, comprising at least one lateral roller (6) which is interposed between said floating support (20) and said bracket (40), said lateral roller (6) preferably having a vertical rolling axis (V) so that a rolling of said lateral roller (6) about said vertical rolling axis (V) allows relative sliding between said floating support (20) and said bracket (40) in parallel with said sliding direction (X).
A telescopic guide (100) according to any one of the preceding claims, comprising a first runner (7) which is secured for translational movement with respect to said base support (10) in said sliding direction (X), said first runner (7) comprising:
• an upper cage (71) which is configured to define a seat of the at least one upper grooved roller (1),

• a lower cage (72) which is configured to define a seat of the at least one lower grooved roller (2),

• a structural connection (73) between said upper cage (71) and said lower cage (72),
said first runner (7) securing said floating support (20) for translational movement with respect to said base support (10) in said sliding direction (X).
A telescopic guide (100) according to claim 7, wherein said base support (10) comprises an upper edge (13) and a lower edge (14) which extend along said upper base rail (11) and along said lower base rail (12), respectively, said upper edge (13) and said lower edge (14) being configured to limit tilting (T) of said upper cage (71) and of said lower cage (72), respectively, transversely to said sliding direction (X) so as to prevent a release of said floating support (20) from said first runner (7) transversely to said sliding direction (X).
A telescopic guide (100) according to any one of claims 3 to 8, comprising a second runner (8) which is configured to define seats of said planar rollers (51, 52), said second runner (8) comprising a tongue (81) which is configured to engage in said concave sliding surface (24) so as to secure said second runner (8) for translational movement with respect to said floating support (20) in said sliding direction (X), said tongue (81) being resiliently deformable in order to allow a release of said second runner (8) from said floating support (20) transversely to said sliding direction (X).
A telescopic guide (100) according to any one of claims 3 to 9, comprising at least one device to be selected from a first stop (77) which is fixedly joined to said base support (10) and a second stop (88) which is fixedly joined to said bracket (40), said first stop (77) delimiting a path of said first runner (7) with respect to said base support (10) in said sliding direction (X), said first stop (77) being removable in order to allow said first runner (7) to be removed from said base support (10) in parallel with said sliding direction (X), said second stop (88) delimiting a path of said bracket (40) with respect to said second runner (8) in said sliding direction (X).
A telescopic guide (100) according to the preceding claim, wherein said second runner (8) comprises a longitudinal edge (97) which extends in parallel with said sliding direction (X), said longitudinal edge (97) being configured to secure said second stop (88) for sliding in said sliding direction (X) so as to prevent a release of said bracket (40) from said second runner (8) transversely to said sliding direction (X).
A telescopic guide (100) according to any one of the preceding claims, when dependent on claim 3 and either claims 7 or claim 9, wherein said first runner (7) or said second runner (8) comprises a joint (9) which is interposed between the seats of two grooved rollers (1, 2) or of two planar rollers (51, 52), respectively, said joint (9) having a length in said sliding direction (X) which is adjustable so as to adjust a horizontal distance (D) between said two grooved rollers (1, 2) or between said two planar rollers (51, 52), respectively.
A telescopic guide (100) according to any one of the preceding claims, wherein said grooved rollers (1, 2) comprise at least one upper grooved roller (1) which is interposed between said upper base rail (11) and said upper floating rail (21) and at least one lower grooved roller (2) which is interposed between said lower floating rail (22) and said lower base rail (12) and at least one additional grooved roller to be selected from an additional upper grooved roller (1) or an additional lower grooved roller (2).
A telescopic guide (100) according to any one of the preceding claims, wherein said upper base rail (11) and said lower base rail (12) comprise an upper longitudinal groove (31) and a lower longitudinal groove (32), respectively, which extend in parallel with said sliding direction (X) and in which said floating support (20) comprises an upper tooth (33) and a lower tooth (34) which are configured to engage in a sliding manner in said upper longitudinal groove (31) and in said lower longitudinal groove (32), respectively, so as to prevent a derailing of said floating support (20) with respect to said pair of base rails (11, 12).
A telescopic guide (100) according to any one of the preceding claims, wherein said sliding surface (23) has a convex shape and preferably defines a relief with respect to respective lateral portions of said base rails (11, 12) and of said floating rails (21 ,22).