TELESCOPIC RAIL

Abstract

A telescopic rail has first, second, and third rail elements, and a drive device. The first and second rail elements are mounted together such that the first and second rail elements are linearly displaceable relative to one another in and counter to a pull-out direction. The third and second rail elements are mounted together such that the third and second rail elements are linearly displaceable relative to one another. The drive device, mounted on the first rail element, causes a linear movement of the second rail element relative to the first rail element. A traction element, fixed to the first and third rail elements, is guided on the second rail element parallel to the pull-out direction such that a displacement movement of the second rail element relative to the first rail element leads to a displacement movement of the third rail element relative to the second rail element.

Claims

1. A telescopic rail (4) comprising a first rail element (1), a second rail element (2), a third rail element (3), and a drive device (13); wherein the first rail element (1) and the second rail element (2) are mounted together such that the first rail element (1) and the second rail element (2) are linearly displaceable relative to one another in and counter to a pull-out direction (7); wherein the third rail element (3) and the second rail element (2) are mounted together such that the third rail element (3) and the second rail element (2) are linearly displaceable relative to one another in and counter to the pull-out direction (7); wherein the drive device (13) is mounted on the first rail element (1) or is mountable on a holding element connectable to the first rail element; wherein the drive device (13) is configured such that, in an operation of the telescopic rail (4), the drive device (13) causes a linear movement of the second rail element (2) relative to the first rail element (1) in or counter to the pull-out direction (7); wherein the telescopic rail (4) comprises a traction element (5); wherein the traction element (5) is fixed to the first rail element (1) and to the third rail element (3); wherein the traction element (5) is guided on the second rail element (2) in a direction parallel to the pull-out direction (7) such that a displacement movement of the second rail element (2) relative to the first rail element (1) leads to a displacement movement of the third rail element (3) relative to the second rail element (2); and the drive device is selected from a spindle drive, a tooth belt drive, a rack-and-pinion drive, a flexible shaft, a push rod, a push element, a traction element, a cable pull, a gas compression spring, a hydraulic or pneumatic cylinder, a receptacle for a linear motor, an electromagnetic linear drive, or a combination thereof.

2. The telescopic rail (4) according to claim 1, characterized in that the second rail element (2) comprises a first guide element (10, 18) having a first deflection surface (21) and a second guide element (9, 17) having a second deflection surface (22), wherein the first guide element (10, 18) is configured such that a pulling force in the pull-out direction (7) can be transmitted from the second rail element (2) to the traction element (5) by means of the first guide element (10, 18), wherein the second guide element (9, 17) is configured such that a pulling force counter to the pull-out direction (7) can be transmitted from the second rail element (2) to the traction element (5) by means of the second guide element (9, 17), and wherein the traction element (5) is deflected by the first and second deflection surfaces (21, 22) such that a displacement movement of the second rail element (2) relative to the first rail element (1) causes a transmission of a pulling force from the traction element (5) to the third rail element (3) in or counter to the pull-out direction.

3. The telescopic rail (4) according to claim 2, characterised in that at least the first guide element (10, 18) or the second guide element (9, 17) comprises a pair of oppositely disposed traction element guide surfaces (23, 24) which face one another, wherein the traction element guide surfaces (23, 24) are configured such that they guide the traction element (5) in a direction perpendicular to the pull-out direction (7).

4. The telescopic rail (4) according to claim 2, characterised in that at least the first guide element (10, 18) or the second guide element (9, 17) comprises a stationary holding portion (29) which is fixed to the second rail element (2) and a deflection portion (30) which is fixed to the holding portion (29) such that it can be moved in the pull-out direction (7), wherein the deflection portion (30) comprises the first and second deflection surfaces (21, 22) of the guide element (9, 17), and wherein the deflection portion (30) is resiliently pretensioned relative to the holding portion (29) in or counter to the pull-out direction (7) by means of a spring element (31), such that the traction element (5) is tensioned.

5. The telescopic rail (4) according to any one of claim 2 characterised in that at least the first or the second deflection surface (21, 22) is configured such that first or second deflection surface (21, 22) deflects the traction element by 180, wherein the first or second deflection surface (21, 22) comprises a recess (25, 26), so that the traction element (5) is in frictional engagement with the first or second deflection surface (21, 22) over an angular range of less than 180.

6. The telescopic rail (4) according to the claim 5, characterised in that the traction element (5) comprises a latching projection (27) on a surface (28) which comes into frictional engagement with the first or second deflection surface (21, 22).

7. The telescopic rail (4) according to claim 2, characterised in that the telescopic rail (4) comprises a rolling element cage with rolling elements received there-in and guided between the running surfaces of the second rail element (2) and the third rail element (3), wherein at least the first guide element (10, 18) or the second guide element (9, 17) forms a stop (35) for a movement of the rolling element cage (34) in or counter to the pull-out direction (7).

8. The telescopic rail (4) according to claim 2, characterised in that the drive device is a spindle drive (13) comprising a threaded spindle (19) which is rotatable relative to the first rail element (1) and is stationarily mounted in the pull-out direction (7) and an internal thread (38) which is fixed on the second rail element (2) in the pull-out direction (7), wherein the internal thread (38) is mounted as a portion of a spindle nut (20) such that it floats in at least one direction perpendicular to the pull-out direction (7).

9. The telescopic rail (4) according to claim 8, characterised in that the internal thread (38) is mounted as a portion of a spindle nut (20) in the first or second guide element (1, 2) such that it floats in at least one direction perpendicular to the pull-out direction (7) with a nut clearance, wherein the threaded spindle (19) is guided through the guide element (17, 18) in a spindle receiving bore (41), wherein the threaded spindle (19) in the spindle receiving bore (41) has a spindle clearance and wherein the spindle clearance is less than or equal to the nut clearance.

10. The telescopic rail (4) according to claim 8, characterised in that the internal thread (38) is a portion of a spindle nut (20), wherein the spindle nut (20) comprises a torque arm which introduces torque transmitted from the threaded spindle (19) to the spindle nut (20) into the first or second guide element (17, 18).

11. The telescopic rail (4) according to claim 8, characterised in that the spindle nut (20) is a clasp nut as an overload protection.

12. The telescopic rail (4) according to claim 1, characterised in that the traction element (5) is configured in two parts with a first traction element portion (11) guided around the first guide element (10, 18) and a second traction element portion (12) guided around the second guide element (9, 17), wherein the first and the second traction element portion (11, 12) are respectively fixed on the first rail element (1) and the third rail element (3).

13. The telescopic rail (4) according to claim 1, characterised in that the second rail element (2) comprises an axial bearing for the threaded spindle (19), wherein the axial bearing preferably comprises a bearing plate (42) bent out of a rail back of the first rail element (1).

14. The telescopic rail (4) according to claim 1, characterised in that the traction element (5) is configured such that both pulling forces and pushing forces can be transmitted by means of the traction element (5), wherein the second rail element (2) comprises a guide element (17, 18), wherein the guide element (17, 18) is configured such that a pulling force and a pushing force can be transmitted from the second rail element (2) to the traction element (5) by means of the guide element (17, 18), and wherein the traction element (5) is deflected by the guide element (17, 18) such that both a pulling force acting on the traction element (5) and a pushing force acting on the traction element (5) causes a displacement movement of the third rail element (3) in or counter to the pull-out direction (7) relative to the second rail element (2).

15. A pull-out assembly comprising a holding element, in particular a carcass, and a receiving element, in particular a drawer, which can be moved relative to the holding element, and two telescopic rails (4) which are disposed opposite to one another and with parallel pull-out directions (7) according to claim 1, wherein the first rail element (1) of each telescopic rail (4) is connected to the holding element and the third rail element (3) of each telescopic rail (4) is connected to the receiving element.

16. A telescopic rail (4) comprising a first rail element (1), a second rail element (2), a third rail element (3), and a drive device (13); wherein the first rail element (1) and the second rail element (2) are mounted together such that the first rail element (1) and the second rail element (2) are linearly displaceable relative to one another in and counter to a pull-out direction (7); wherein the third rail element (3) and the second rail element (2) are mounted together such that the third rail element (3) and the second rail element (2) are linearly displaceable relative to one another in and counter to the pull-out direction (7); wherein the drive device (13) is mounted on the first rail element (1) or is mountable on a holding element connectable to the first rail element; wherein the drive device (13) is configured such that, in an operation of the telescopic rail (4), the drive device (13) causes a linear movement of the second rail element (2) relative to the first rail element (1) in or counter to the pull-out direction (7); wherein the telescopic rail (4) comprises a traction element (5); wherein the traction element (5) is fixed to the first rail element (1) and to the third rail element (3); wherein the traction element (5) is guided on the second rail element (2) in a direction parallel to the pull-out direction (7) such that a displacement movement of the second rail element (2) relative to the first rail element (1) leads to a displacement movement of the third rail element (3) relative to the second rail element (2); and the drive device is selected from an elastic string drive, a chain drive, a belt drive, a flat belt drive, a V-belt drive, or a combination thereof.

17. The telescopic rail (4) according to claim 16, characterized in that the second rail element (2) comprises a first guide element (10, 18) having a first deflection surface (21) and a second guide element (9, 17) having a second deflection surface (22), wherein the first guide element (10, 18) is configured such that a pulling force in the pull-out direction (7) can be transmitted from the second rail element (2) to the traction element (5) by means of the first guide element (10, 18), wherein the second guide element (9, 17) is configured such that a pulling force counter to the pull-out direction (7) can be transmitted from the second rail element (2) to the traction element (5) by means of the second guide element (9, 17), and wherein the traction element (5) is deflected by the first and second deflection surfaces (21, 22) such that a displacement movement of the second rail element (2) relative to the first rail element (1) causes a transmission of a pulling force from the traction element (5) to the third rail element (3) in or counter to the pull-out direction.

18. The telescopic rail (4) according to claim 17, characterised in that at least the first guide element (10, 18) or the second guide element (9, 17) comprises a pair of oppositely disposed traction element guide surfaces (23, 24) which face one another, wherein the traction element guide surfaces (23, 24) are configured such that they guide the traction element (5) in a direction perpendicular to the pull-out direction (7).

19. The telescopic rail (4) according to claim 18, characterised in that at least the first guide element (10, 18) or the second guide element (9, 17) comprises a stationary holding portion (29) which is fixed to the second rail element (2) and a deflection portion (30) which is fixed to the holding portion (29) such that it can be moved in the pull-out direction (7), wherein the deflection portion (30) comprises the deflection surface (21, 22) of the guide element (9, 17), and wherein the deflection portion (30) is resiliently pretensioned relative to the holding portion (29) in or counter to the pull-out direction (7) by means of a spring element (31), such that the traction element (5) is tensioned.

20. A pull-out assembly comprising a holding element, in particular a carcass, and a receiving element, in particular a drawer, which can be moved relative to the holding element, and two telescopic rails (4) which are disposed opposite to one another and with parallel pull-out directions (7) according to claim 16, wherein the first rail element (1) of each telescopic rail (4) is connected to the holding element and the third rail element (3) of each telescopic rail (4) is connected to the receiving element.

Description

[0065] Further advantages, features, and possible applications of the present invention will become apparent from the following description of an embodiment and the associated figures. In the figures, identical elements are identified with the same reference numerals.

[0066] FIG. 1 is a schematic lateral view of a telescopic rail according to one embodiment of the present invention.

[0067] FIG. 2 is an isometric view of a telescopic rail according to one embodiment of the present invention in the fully pushed-in state.

[0068] FIG. 3 is a partially broken away isometric view of the telescopic rail of FIG. 2 in the partially pulled-out state.

[0069] FIG. 4 is an isometric view of the telescopic rail from FIGS. 2 and 3 in the fully pulled-out state.

[0070] FIG. 5 is a partially broken away isometric view of the telescopic rail from FIGS. 2 to 4 in the fully pulled-out state.

[0071] FIG. 6 is an isometric view of a partially pulled-out embodiment of a telescopic rail according to a further embodiment of the present invention.

[0072] FIG. 7 is a partially broken away, enlarged isometric view of the first guide element of the telescopic rail of FIG. 6.

[0073] FIG. 8 is a partially broken away, enlarged top plan view of the first guide element of FIG. 7.

[0074] FIG. 9 is a partially broken away, enlarged partial sectional view of the first guide element of FIGS. 7 and 8.

[0075] FIG. 10 is a partially broken away, enlarged partial sectional view of the second guide element of the telescopic rail from FIGS. 6 to 9.

[0076] FIG. 11 is a partially broken away, enlarged lateral view of the bearing of the threaded spindle of the telescopic rail from FIGS. 6 to 10.

[0077] FIG. 12 is a sectional view of the telescopic rail from FIG. 6 in the region of the spindle nut.

[0078] FIG. 13 is a partially broken away, sectional view of the telescopic rail from FIG. 6 in the region of the first guide element.

[0079] FIG. 14 is a partially broken away, sectional view of an alternative embodiment of the traction element.

[0080] FIGS. 15a and 15b show an embodiment of a two-piece traction element.

[0081] The telescopic rails 4 discussed below with reference to the illustrations from the figures all comprise exactly three rail elements, namely a first rail element 1, a second rail element 2, and a third rail element 3. In these embodiments, the first rail element 1 forms an outer rail, the second rail element forms a centre rail, and the third rail element 3 forms an inner rail of the telescopic rail 4.

[0082] The considered embodiments of the telescopic rail 4 are fully pulled-out embodiments, i.e., the third rail element 3 can be pulled out to its full length relative to the first rail element 1, such that it no longer has an overlap with the first rail element 1 in the pull-out direction 7. In the illustrated embodiments, the first rail element 1 is a fixed rail element, for example connected to a carcass of a piece of furniture.

[0083] The rail elements 1, 2, 3 are each displaceably mounted to one another in pairs. The second rail element 2 is thus displaceably mounted on the first rail element 1, and the third rail element is displaceably mounted on the second rail element 2.

[0084] In the illustrated embodiment, the centre rail element 2 consists of two rails connected to one another in a material-locking fashion at the back, each having two running surfaces.

[0085] The schematic diagram of FIG. 1 illustrates the principle underlying the invention, namely the coupling of a displacement movement of the second rail element 2 to the first rail element 1 to a displacement movement of the third rail element 3 to the second rail element 2.

[0086] For the subsequent considerations, it is initially irrelevant how the second rail element 2 is moved relative to the first rail element 1, in particular how a drive of the second rail element 2 is configured for a displacement movement of this rail element 2 relative to the first rail element 1.

[0087] The coupling between the two displacement movements is carried out via a traction element; in the embodiment shown, this is done via a transversely elastic belt 5 made of nylon. This elastic belt 5 is fixed with the aid of a rivet 6 at the front end of the first rail element 1 in the pull-out direction 7. In addition, the belt 5 is also fixed with a rivet 8 at the back end of the third rail element 3 in the pull-out direction 7.

[0088] The belt 5 is now additionally guided around two guide elements in the form of a first pin 10 and a second pin 9, which are provided so as to be stationary on the second rail element 2. In the sense of the present application, the first pin 10 forms a first guide element and the second pin 9 forms a second guide element. If the second rail element 2 is now moved in the pull-out direction 7 opposite the first rail element 1, the first pin 10 presses the belt 5 in the pull-out direction 7 and thus exerts a pulling force over the belt 5 and the rivet 8 on the third rail element 3, so that the third rail element 3 is also displaced in the pull-out direction 7 relative to the second rail element 2.

[0089] During a movement of the second rail element 2 in the pull-out direction, a first portion 11 of the belt 5, which extends from the rivet 6 on the first rail element via the first pin 10 to the rivet on the third rail element 3, forms a load run 11. A second portion of the belt 5, which extends from the rivet 6 on the first rail element 1 via the second pin 9 to the rivet 8 on the third rail element 3, forms an empty drum in this direction of movement. If one reverses the direction of movement of the second rail element 2 so that it shifts counter to the pull-out direction 7 to the first rail element 1, the load run 11 becomes the empty run and the empty run 12 becomes the load run.

[0090] When the second rail element 2 is moved in the pull-out direction 7, the first pin 10 acts as a loose roll, wherein the loose end of the belt 5 pulls the third rail element 3 in the pull-out direction 7. If the direction of movement reverses, this consideration applies to the second pin 9.

[0091] FIGS. 3 to 5 now show isometric views of a telescopic rail 4, which realizes the design principle previously described based on the schematic of FIG. 1.

[0092] In this embodiment, the centre rail 2 is displaceable relative to the first rail element 1 in and counter to the pull-out direction 7 with the aid of a spindle drive 13 in a motor-driven manner. The threaded spindle of the spindle drive 13 is mounted on the first rail element 1 and engages a spindle nut fixed on the second rail element 2, such that when the spindle rotates, the second rail element is displaced relative to the first rail element. In the illustrated embodiment, the spindle nut is fixed in and counter to the pull-out direction 7 on the second rail element, but floats in the transverse direction perpendicular to the pull-out direction 7, i.e., with a clearance, in order to be able to accommodate tolerances in the transverse direction. The spindle is in turn coupled to an electric motor 14 so that the pull-out and push-in movement of the telescopic rail 4 is motor-driven.

[0093] In the illustrations of FIGS. 4 and 5, the telescopic rail 4 is shown placed on the first rail element 1, wherein the upper part of the telescopic rail 4 is shown broken away in FIGS. 3 and 4. A look into the interior of the second rail element 2 is thus possible.

[0094] Inside, a belt of nylon can be seen as a traction element 5, which is fixed at the points marked with reference numerals 15 and 16 on the first 1 and third 3 rail elements, respectively. If the spindle drive 13 now moves the second rail element 2 in the pull-out direction 7, this displacement movement leads to a pull on the belt 5, so that the third rail element 3 is also displaced in the pull-out direction relative to the second rail element 2.

[0095] In FIG. 5, in particular, the two guide elements 17, 18 disposed on the second rail element 2 can be seen. Like the pins 9, 10, the function of which has previously been described for the schematic of FIG. 1, these guide the belt-shaped traction element 5 and support the traction element 5 in a direction parallel to the pull-out direction 7. In this way, forces acting on the second rail element 2 in a direction parallel to the pull-out direction 7 can be transmitted to the traction element 5.

[0096] FIGS. 6 to 13 show various aspects of a further embodiment of the telescopic rail 4. This telescopic rail 4 also consists of a first stationary rail element 1, a second central rail element 2, and a third rail element 3. The three rail elements 1, 2, 3 form a fully telescopic extractor.

[0097] In this embodiment, as well, the drive of a pull-out or push-in movement of the second rail element 2 occurs relative to the first rail element 1 with the aid of a spindle drive 13. The spindle drive 13 comprises a threaded spindle 19, a spindle nut 20, and an electric motor 14. The pull-out or push-in movement of the third rail element 3 relative to the first rail element 1, which is synchronized to the pull-out or push-in movement of the second rail element 2, occurs with the aid of a belt 5 as a traction element, as in the previously described embodiments.

[0098] To guide the belt 5, the embodiment of the telescopic rail 4 from FIGS. 6-13 also comprises two guide elements 17, 18. The first guide element 17 is shown enlarged in FIGS. 7-9. As can be seen in FIGS. 7 and 8, the first guide element 17 comprises two first deflection surfaces 21, 22. In this way, two traction elements can be guided with the first guide element in order to adapt the telescopic rail 4 to various load cases. In the illustrated embodiment, only one belt 5 for synchronizing the pull-out or push-in movement of the third rail element 3 is received on the two guide elements 17, 18.

[0099] In the illustrations of FIGS. 7 and 8, it can be seen that the belt 5 on the first guide element 17, in addition to the deflection surface 22, is also guided laterally with the aid of two traction element guide surfaces 23, 24, which face each other. These lateral traction element guide surfaces 23, 24 prevent skipping or jumping of the belt 5 from the respective deflection surface 21, 22. In addition, the traction element guide surfaces 23, 24 centre the run of the belt 5 on the respective deflection surface 21, 22.

[0100] Each of the deflection surfaces 21, 22 causes a deflection of the belt 5 by 180, wherein 180 is the looping angle of the belt. However, the deflection surfaces 21, 22 each have two recesses 25, 26. These recesses 25, 26 reduce the support surface of the belt 5 on the respective deflection surface 21, 22, so that the friction between the belt 5 and the respective deflection surface 22 is reduced. The recesses 25, 26 shown extend over an angular range of less than 90, respectively.

[0101] The recesses 25, 26 can also provide a latching function, as shown schematically in FIG. 14. In this variant, the traction element 5 comprises a latching projection 27 on its inner surface 28. This latching projection snaps into place upon reaching one of the recesses 25, 26 and positions the belt 5 and thus the pull-out movement of the third rail element 3 relative to the second rail element 2 at a position predetermined by the position of the latching projection 27 on the belt 5.

[0102] It is understood that the second guide element 18 is configured so as to correspond to the first guide element 17. The second guide element 18 also has two deflection surfaces 21, 22, which likewise cause a deflection of the traction element 5 by 180. This can be seen from the sectional view of FIG. 10.

[0103] In the illustrated embodiment of the second guide element 18, it is configured in two parts. The guide element 18 includes a holding portion 29 and a deflection portion. The holding portion is stationarily connected to the second rail element 2, while the deflection portion 30 is displaceably mounted on the holding portion 29 in the pull-out direction. The deflection portion supports the deflection surfaces 21, 22. A spiral spring 31 as a spring element within the meaning of the present application resiliently pretensions the deflection portion 30 in the pull-out direction 7. In this way, the spring 31 keeps the traction element 5 tight under pulling stress. This reduces the clearance of the traction element 5 relative to the three rail elements 1, 2, 3 and thus reduces the clearance of the pull-out movements of the rail elements relative to one another. The movement of the deflection portion 30 under pretensioning is limited by a stopping surface 32 on the holding portion 29, wherein the deflection portion 30 comprises a hook 33, which is configured so as to engage with and abut against the stopping surface 32. The combination of the stopping surface 32 and the hook 33 also serves for simple mounting of the deflection portion on the holding portion. The deflection portion 30 is pushed onto the holding portion 29 and is locked as soon as the axial position of the hook 33 has passed the stopping surfaces 32.

[0104] In the illustrated embodiment, a rolling element cage 34 in the form of a strip ball cage 34 is provided between two rail elements 1, 2, 3, respectively. The first guide element 17 also forms a stop for two strip ball cages 34, which are disposed between the second rail element 2 and the third rail element 3.

[0105] The first guide element 17 also serves to mount the spindle nut 20 on the second rail element 2. This reduces the number of necessary components at and connections to the second rail element 2. The spindle nut 20 supports an internal thread 38, which engages with the threaded spindle 19. The spindle nut 20 is received in the first guide element 17 such that it is fixed in and counter to the pull-out direction such that a rotational movement of the threaded spindle fixedly mounted on the first rail element leads to a linear movement of the spindle nut 20 and thus of the second rail element 2 relative to the first rail element 1.

[0106] By contrast, the spindle nut 20 floats in all directions perpendicular to the pull-out direction 7 on the first guide element 17. Thus, a striking of the threaded spindle 19 against the rail elements is equalized and does not lead to a vibration of the rail elements 1, 2, 3. FIG. 12 shows the bearing of the threaded spindle 20 in the first guide element 17 in a cross-sectional view. When viewed in this manner, the spindle nut 20 floats in both a vertical direction 36 as well as a transverse direction 37.

[0107] The spindle nut 20 is further configured so as to comprise torque supports in the form of projections 39 on two sides. These introduce the torques that have been transmitted from the threaded spindle 19 to the spindle nut 20 into the first guide element 17. Thus, the torques do not need to be transmitted exclusively over the lateral surfaces 40 of the spindle nut. The rail is thus also usable for higher load cases.

[0108] The projections 39 not only serve to form torque supports, but also provide a clear assembly orientation that prevents an incorrect mounting of the spindle nut 20.

[0109] In FIG. 7, it can be seen that the threaded spindle 19 is passed through the first guide element via a spindle receiving bore 41, in order to engage the spindle nut 20. The spindle receiving bore 41 is sized such that the clearance of the threaded spindle 19 in the spindle receiving bore 41 is smaller than the clearance of the spindle nut 20 in the vertical direction 36 and the transverse direction 37.

[0110] FIG. 10 shows the bearing of the motor-side end of the threaded spindle 19 on the first rail element 1. This mounting is carried out in the axial direction, i.e., in the pull-out direction, with the aid of a tab 42, which is bent out of the rail back 42 of the first rail element 1, wherein a hollow cylindrical bearing bushing 43 for guiding the spindle 19 is received in this tab 42.

[0111] FIG. 13 clarifies that the guide element 17 has a clearance 44, which allows the third rail element 3 to be mounted on the second rail element 2, which is fully equipped with the guide elements, without a collision of the third rail element 3 against the guide element 17.

[0112] FIGS. 15a and 15b show a two-piece configuration of a belt-shaped traction element 5, wherein the two traction element portions 44, 45 are each connected at their two ends. A fastening element 46 having two hooks 47 serves as the connector for the ends. A suspension loop 48 is provided at each end of the two traction element portions 44, 45 and is suspended in the respective hook 47 of the fastening element 46. The fastening element 46 also comprises a bore, through which a rivet is hit in order to connect the fastening element 46 to the first rail element 1 and the third rail element 3, respectively.

[0113] For the purpose of the original disclosure, it should be noted that all of the features as they become apparent to a person skilled in the art from the present description, the drawings and the claims, even if they have been specifically described only in connection with specific other features, can be combined both individually and in any combination with other features or groups of features disclosed here, insofar as this has not been expressly excluded or technical circumstances make such combinations impossible or pointless. A comprehensive, explicit presentation of all conceivable combinations of features is omitted here solely for the sake of brevity and legibility of the description.

[0114] Although the invention has been presented and described in detail in the drawings and the foregoing description, this representation and description is merely an example and is not intended to limit the scope of protection as defined by the claims. The invention is not limited to the disclosed embodiments.

[0115] Modifications of the disclosed embodiments will be obvious to those skilled in the art from the drawings, the description and the appended claims. In the claims, the word comprise does not exclude other elements or steps, and the indefinite article a does not exclude a plurality. The mere fact that certain features are claimed in different claims does not preclude their combination. Reference numerals in the claims are not intended to limit the scope of protection.

LIST OF REFERENCE NUMERALS

[0116] 1 First rail element [0117] 2 Second rail element [0118] 3 Third rail element [0119] 4 Telescopic rail [0120] 5 Belt as traction element [0121] 6, 8 Rivet [0122] 7 Pull-out direction [0123] 9, 10 Pin [0124] 11 Load run [0125] 12 Empty run [0126] 13 Spindle drive [0127] 14 Electric motor [0128] 15 Fixing point of the belt 5 on the first rail element 1 [0129] 16 Fixing point of the belt 5 on the third rail element 3 [0130] 17, 18 Guide element [0131] 19 Threaded spindle 19 [0132] 20 Spindle nut [0133] 21, 22 Deflection surface [0134] 23, 24 Traction element guide surfaces [0135] 25, 26 Recess [0136] 27 Latching projection of the traction element 5 [0137] 28 Inner surface of the traction element 5 [0138] 29 Holding portion [0139] 30 Deflection portion [0140] 31 Spiral spring [0141] 32 Stopping surface [0142] 33 Hook [0143] 34 Strip ball cage [0144] 35 Stop [0145] 36 Vertical direction [0146] 37 Transverse direction [0147] 38 Internal thread [0148] 39 Projection [0149] 40 Lateral surface of the spindle nut [0150] 41 Spindle receiving bore [0151] 42 Tab for guiding the threaded spindle [0152] 43 Bearing bushing [0153] 44, 45 Traction element portion [0154] 46 Fastening element [0155] 47 Hook [0156] 48 Suspension loop