EP1350444B1 - Bottom-slide for extensible furniture - Google Patents

Abstract

The drawer rail system comprises two rails (20) attached to the carcass, two rails (10) attached to the bottom of the drawer and two intermediate rails (30). Two wheels (41, 41') are mounted at the front end of each intermediate rail whose axes are at equal angles to the horizontal, but in opposite directions, two similar wheels (43, 43') halfway down it and a single upright roller (42) at its back end. A similar roller (44) is mounted halfway down it. The rail attached to the drawer has surfaces bent to cooperate with the front set of sloping and upright wheels while the rail attached to the carcass has similar surfaces which cooperate with the middle wheels.

Description

The invention relates to a Unterbodenausziehführung for pull-out furniture parts, especially drawers and drawers, fastened to the furniture body carcass rail, attachable to the underside of the extendable furniture part pull-out rail and between the carcass rail and the pull-out rail and between these differentially running center rail on both sides of the extendable Furniture part, being provided to allow the mutual displacement of the rails rollers.

Unterbodenausziehführungen have arranged opposite to the side walls of the extendable furniture part pull-out the advantage that the usable width of the pull-out furniture part is not reduced. For this occurs in Unterbodenausziehführungen the problem that their installation height should be as low as possible. On the one hand, they can be arranged in the installed state invisible behind this provided veneers on the extendable furniture part, on the other hand, the required distance from stacked extendable furniture parts to provide the installation height for the pull-out, kept low.

This problem occurs to a particular extent in full extracts, which have a fixed between the stationary carcass rail and the pull-out furniture part drawer rail a center rail. In order nevertheless to achieve a low overall height of the pull-out guide, relatively small cage-held rolling elements are usually used in their dimensions for displaceable mounting of the rails, which roll between mutually facing raceways of the rails. Both cylindrical and spherical rolling elements are used. Such underfloor full extension is known for example from DE 39 21 859 A1. In one of the embodiments shown also rotatably mounted on the middle rail, on the one hand on the carcass rail on the other hand on the pull-out rail rolling rollers are provided to move the extension rail at the same time the center rail in each case by half way the pull-out rail. Without such synchronized rollers, the pull-out rail and middle rail are removed Type of telescopic extension in succession, which is disadvantageous in terms of ease of use.

In addition to such roller-mounted pull-out guides, so-called roller pull-out guides are known in which the rollers are rotatably mounted on the rails by means of axles attached to the rails. Such roller extension guides usually have relatively large heights and are usually used mainly for to be arranged on the side walls of the pull-out furniture parts pull-out, especially if it is a full extension. Roller full extension with different running medium rail have become known in different embodiments. For example, the CH 679 735 A5 shows a fastened to the side walls of the extendable furniture part differential extract, in which all rollers are arranged on the center rail. In the region of its front end, a front roller is rotatably mounted on the center rail, which projects beyond the center rail downwards. In the area of its rear end, a rear roller is rotatably mounted, which projects beyond the middle rail upwards. In a central region of the middle rail upper and lower middle rollers are rotatably mounted, of which the lower roller is designed as a play with respect to its axis rotatably mounted differential role. The carcass rail is U-shaped and surrounds the middle rail. The pull-out rail has a horizontal land having a downwardly-directed track for engagement with the front roller and the lower middle track roller of the center rail and an upwardly-directed track for engagement with the upper center track roller of the center rail. The differential extract shown in CH 679 735 A5 has a relatively large height and the differential extension is only slightly stable compared to laterally acting forces.

In Unterbodenausziehführungen better lateral guides are further required in comparison to be mounted on the side cheeks pull-out guides to allow an exact running behavior of these guides and absorb laterally acting forces. In ball-bearing pull-out guides, as they are known for example from the aforementioned DE 39 21 859 A1, very small manufacturing tolerances are required to achieve the desired guiding properties in the vertical and horizontal directions.

A Unterbodenausziehführung in the form of a full extension with arranged between the rails in cages roller-shaped rolling elements is known from DE 296 16 756 U1. To achieve the side guide, the cages also extend into the areas between the vertical flanges of the adjacent guide rails and have between these vertical flanges rolling about vertical axes rotatable rollers. It is a telescopic extension without differential movement of the middle rail.

From DE 44 32 821 A1 a Unterbodenausziehführung in the manner of a telescopic extension without a differential movement of the center rail is known in which the middle rail is ball-mounted on the carcass rail. On vertical webs of the middle rail, the middle rail rollers are rotatably mounted on both sides about horizontal axes, along which the pull-out rail runs off. Furthermore, rotatably mounted guide rollers are provided to form a side guide between the center rail and the slide rail on the center rail about vertical axes.

A guide for extendable furniture parts in the form of a single extension is known from EP 0 196 412 A1. Between the carcass rail and the pull-out rail arranged in a cage rolling elements are provided, whose axes are aligned perpendicular to each other and which are alternately supported on two opposite of the four running surfaces of the rails. The treads are each offset by 90 ° from each other and have angles of 45 ° to the vertical or horizontal.

Another pull-out guide in the form of a single extension with rolling elements arranged in cages is known from EP 1 066 773 A1. From this document goes u.a. an embodiment (as shown in FIG. 9), in which the pull-out rail has two mutually facing downwardly facing raceways and an upwardly directed track and the carcass rail has two angularly mutually facing upwardly facing tracks and a downward career.

From DE 25 22 414 A1 goes further a Unterbodenausziehführung for drawers, in which rotatably mounted on rails rollers are provided, whose axes are inclined relative to the horizontal. This should an extract be created in which the lateral friction is eliminated, without the need for separate roles are required.

An extension guide of the type mentioned is known from AT 404 222 B. This has next to the middle rail about horizontal axes rotatably mounted rollers, which roll on facing horizontal flanges of the carcass rail and the pull-out rail, also between horizontal flanges of the center rail on the one hand and horizontal flanges of the carcass rail or pull-out rail on the other rolling rollers, which are arranged in roller cages , In addition to rollers rotatable about horizontal axes, these guide cages also have rollers which are rotatable about vertical axes and which roll between mutually opposite vertical flanges on the one hand of the middle rail and on the other hand of the carcass rail or pull-out rail, thereby achieving lateral guidance. This pull-out guide has a relatively complex structure, which also results from the simultaneous use of rotatably mounted on a rail rollers and arranged in cages rolling elements.

The object of the invention is to provide a Unterbodenausziehführung of the aforementioned type, which has very good operating characteristics at a low height and in which a good lateral guidance is achievable, this with a simple structure.

According to the invention, this is achieved by a Unterbodenausziehführung with the features of claim 1.

The inventive construction an underfloor differential extension is provided in the form of a roller pull-out, which makes do without the use of arranged in cages rolling elements and due to the use of rotatably mounted on a rail rollers excellent running characteristics, of which arranged at an angle to the horizontal rollers also lateral forces can be absorbed. An extension guide according to the invention can also be formed in a small height, which may correspond to that of conventional commercially available underbody guides. The lowest heights of common on the market underbody full extensions are about 27 to 28mm, which value can also be achieved in a pull-out according to the invention.

Advantageously, in an extension guide according to the invention, all rollers can be rotatably mounted on the center rail, which leads to a rational production of a pull-out guide according to the invention, in particular in connection with a design of the rails of a pull-out guide according to the invention in the form of folded sheets.

Fig. 1

eine perspektivische Darstellung eines ersten Ausführungsbeispiel der Erfindung im ausgezogenen Zustand der Schienen;

Fig. 2

eine Ansicht von vorne;

Fig. 3

eine Draufsicht auf die Mittelschiene;

Fig. 4

einen Schnitt entlang der Linie AA von Fig. 3;

Fig. 5

eine perspektivische Darstellung der Mittelschiene in einer Ansicht von schräg vorne (von der gegenüber Fig. 1 gegenüberliegenden Seite);

Fig. 6

die zusammengesetzten Schienen im ausgezogenen Zustand in einem Schnitt entsprechend Fig. 4;

Fig. 7

eine etwas modifizierte Ausbildung der Mittelschiene in einer Ansicht entsprechend Fig. 5;

Fig. 8

eine perspektivische Darstellung eines Auszugs gemäß einer weiteren Ausführungsvariante der Erfindung im ausgezogenen Zustand;

Fig. 9

eine Ansicht des Auszugs von Fig. 8 von vorne;

Fig. 10

eine Draufsicht auf die Mittelschiene gemäß der weiteren Ausführungsvariante der Erfindung;

Fig. 11

einen Schnitt entlang der Linie BB von Fig. 10 und

Fig. 12

die zusammengesetzten Schienen im ausgezogenen Zustand in einem Schnitt entsprechend Fig. 11.

Further advantages and details of the invention are explained below with reference to the embodiments illustrated in the accompanying drawings. In the drawing show:

Fig. 1

a perspective view of a first embodiment of the invention in the extended state of the rails;

Fig. 2

a view from the front;

Fig. 3

a plan view of the center rail;

Fig. 4

a section along the line AA of Fig. 3;

Fig. 5

a perspective view of the center rail in a view obliquely from the front (from the opposite side of FIG. 1 side);

Fig. 6

the composite rails in the extended state in a section corresponding to Fig. 4;

Fig. 7

a somewhat modified design of the center rail in a view corresponding to Fig. 5;

Fig. 8

a perspective view of an extract according to another embodiment of the invention in the extended state;

Fig. 9

a view of the extract of Figure 8 from the front.

Fig. 10

a plan view of the center rail according to the further embodiment of the invention;

Fig. 11

a section along the line BB of Fig. 10 and

Fig. 12

the composite rails in the extended state in a section corresponding to FIG. 11.

The Unterbodenausziehführung according to the invention according to the embodiment shown in FIGS. 1 to 6 has a pull-out rail 10, a carcass rail 20 and a middle rail 30 which is partially surrounded by the pull-out rail 10. The drawer rail 10 has a horizontally formed in this embodiment lower web 12, a lateral connecting web 15 and an upper web 11, which comprises a horizontal portion and two thereto by 45 ° downwardly bent portions. The middle rail 30 facing surface of the lower web 12 forms an upwardly directed track 14 of the slide rail 10 and the middle rail 30 facing surfaces of the obliquely downwardly angled portions of the upper web 11 form (obliquely) downwardly facing raceways 13, 13 ', thus at embodiment shown include an angle of 90 °. The horizontal portion of the upper web 11 forms a support flange with which the pull-out rail 10 can be fastened to the underside of an extendable furniture part 2 schematically indicated in FIG. 2 (the holes provided for this purpose in the pull-out rail 10 and the screws are not shown in the figures) ). On the underside of the pull-out furniture part 2 extendable rails are mounted on both sides of middle rails and carcass rails (not shown in the Fig.).

The carcass rail 20 is provided with a mounting leg 21 having a fastened to a furniture body 1 vertical portion and a laterally projecting at the lower end of the vertical portion portion to which a triangular-folded leg 22 connects. This has a horizontal web 25 and two inclined webs 26, 27 which are aligned parallel to the obliquely downwardly bent portions of the upper web 11 of the drawer rail 10 and at their upper side surfaces (obliquely) upwardly oriented tracks 23, 23 'form. The lying parallel to the lower web 12 of the drawer rail 10 horizontal web 25 of the triangular folded leg 22 has at its lower side surface a downward career 24. This downwardly oriented track 24 has by bending the horizontal web 25 formed lateral elevations with the downwardly facing raceway 24 in the embodiment shown include an angle of 45 °.

The center rail 30 has upper and lower support legs 33, 34 which are interconnected on one side of the center rail. The lower support leg 34 is U-shaped with a horizontal base leg. The upper support leg 33 has a central horizontal portion and U-shaped sections adjoining it on both sides, the base legs 35, 36 of the two U-shaped sections being parallel to the downwardly facing raceways 13, 13 'and the upwardly directed raceways 23, 23 'lost.

The middle rail 30 has in the region of its front end 31 two rotatably mounted on their upper support legs 33 front wheels 41, 41 '. The axes 37, 37 'of the front rollers 41, 41' are fixed to the side legs of the two U-shaped portions of the upper support leg 33 and aligned parallel to the downwardly facing raceways 13, 13 'and the upwardly facing raceways 23, 23' , These axes 37, 37 'are inclined by opposing angles 38, 38' relative to the horizontal, said angle 38, 38 'in the illustrated embodiment is 90 °. Preferably, these angles 38, 38 'are inclined in the range between 30 and 60 °. The front rollers 41, 41 'cooperate with the downwardly facing raceways 13, 13' of the slide rail 10 and support the slide rail 10 in the extended state of the rails against tipping down from.

In the region of its rear end 32, the middle rail 30 has a rear roller 42 rotatably mounted on its lower support leg 34 about a horizontal axis 39, which cooperates with the downwardly oriented track 24 of the carcass rail 20 and in the extended state of the rails, the rear end 32nd the middle rail is supported on the carcass rail 20 with respect to pivoting upwards.

In a central region of the middle rail 33, first middle rollers 43, 43 'are rotatably mounted on the upper support leg 33, whose axes 47, 47' are aligned parallel to the axes 37, 37 'of the front rollers 41, 41'. The first middle rollers 43, 43 'are rotatably mounted with play with respect to their axes 37, 37' and form so-called differential rollers, both with the downwardly facing raceways 13, 13 'of the slide rail 10 and with the upwardly facing raceways 23, 23 'of the carcass rail 20 cooperate and ensure the differential run of the center rail 30. At the lower support leg 34 of the middle rail 30 is in a central region of the center rail, in the illustrated embodiment, vertically below the first middle rollers 43, 43 ', a second middle roller 44 rotatably supported about a horizontal axis 48. This second middle roller 44 forms in the extended state of the rails an abutment for the upward trajectory 14 of the drawer rail 10 (against a pivoting upward).

Furthermore, at the upper support leg 33 of the middle rail 30 auxiliary rollers 45, 45 'with play on their axes 49, 49' rotatably mounted, the axes 49, 49 'parallel to the axes 37, 37' of the front rollers 41, 41 'are aligned. The auxiliary roller 45 'is in a range between the upper middle roller 43' and the rear end 32 rotatably mounted on the center rail 30 and serves to support against tilting down of the second end 32 facing portion of the slide rail 10 and the center rail 30 in the retracted state or only slightly extended state of the pull-out. The auxiliary roller 45 is rotatably mounted in the region of the second end 32 of the middle rail 30 at this. In principle, an arrangement of the auxiliary roller 45 in a same region of the longitudinal extension of the central rail 30 as the auxiliary roller 45 'would be possible. The arrangement in the region of the second end 32 has the advantage of a lesser game with respect to the side guide caused by this auxiliary roller 45 due to the more favorable lever ratios.

By the double existing and aligned with opposite angles to the horizontal rollers 41, 41 ', 43, 43' and 45, 45 'in conjunction with the associated downwardly facing raceways 13, 13' and the upwardly facing raceways 23, 23 'is a side guide between the rails 10, 20, 30 causes. To effect further lateral guidance (between the center rail 30 and the carcass rail 20), the rear caster 42 and the second center caster 44 are profiled in accordance with the downwardly facing raceway 24, d. H. they have lateral chamfers 40 for abutment with the lateral elevations of the downwardly directed track 24 of the carcass rail 20.

In principle, other auxiliary rollers 45, 45 'could be provided. Conceivable and possible it would in principle also, instead of the auxiliary roller 45, 45 'shown to arrange at least one auxiliary roller on the lower support leg 34 in the region between the lower middle roller 44 and the front end 31 of the middle rail 30, the tilting of the center rail and the drawer rail in retracted or largely retracted state of the pull-out guide by supporting between the upward career 14 and the downward career 24 prevents, with a side guide function by lateral chamfers on the roller and lateral elevations of the lower track of the carcass rail and possibly also the upward career 14 of the drawer rail 10 could be achieved.

In addition to the first middle rollers 43, 43 ', the second middle roller 44 could also be mounted with play relative to its axle 48. In this case, the first middle rollers 43, 43 'could play on their axes be stored, between the tracks and the rollers then only a very small game should be to the load change when undressing (focus of the extendable furniture moves from the area behind the middle rollers in the area in front of the middle rollers) a tilt-free movement of the guide to reach.

A somewhat modified embodiment of a center rail 30 is shown in FIG. The middle rail here consists of a box profile, which is open on one side via a slot 3. The middle rail 30 is thus formed by an upper U-shaped support legs 33 and a lower U-shaped support legs 34 which are on one side (on the opposite side of the slot 3) connected to each other. The axes of the upper support leg 33 arranged, slanted rollers 41, 41 ', 43, 43', 45, 45 'are attached to punched out of the sheet of the middle rail 30 and opposite this each bent by 45 ° lobes 4.

The embodiment according to FIGS. 8 to 13 corresponds to a kinematic reversal of the previously described embodiment, wherein the previous pull-out rail now forms the carcass rail and the previous carcass rail now forms the pull-out rail. The rails have additionally been rotated by 180 ° about an axis extending in the longitudinal direction of the pull-out guide and the mounting flange 21 has been adapted accordingly, as will be described below. Like-acting parts are designated in this second embodiment with the same reference numerals.

The carcass rail 20 is formed in this embodiment by the outer, the middle rail 30 partially surrounding rail that corresponds in shape approximately to the 180 ° rotated pull-out rail of the first embodiment. The drawer rail 10 is fastened with its lateral connecting web 15 to a furniture body 1, by means of screws screwed through holes 5 (not shown in FIGS.). The now overhead web 12, on which the downwardly oriented raceway 24 is arranged, is now provided with bends to form lateral elevations of this career, where the bevels 40 of the rear roller 42 abut.

The mounting flange 21 of the slide rail 10 has a horizontal portion 28 disposed above the carcass rail 20, for which purpose corresponding bends are provided (which differ from the folds of the mounting flange 21 of the carcass rail 20 of the first embodiment). The upwardly directed track 14 of the carcass rail 20 could also be formed here without the lateral elevations (analogous to the upward-pointing track 14 of the carcass rail 20 of the first embodiment).

The middle rail 30 with the rollers mounted on it corresponds in its construction to the middle rail described in connection with the first exemplary embodiment, which has been rotated by 180 ° about its longitudinal axis.

Various modifications of the embodiments shown are conceivable and possible without departing from the scope of the invention. Thus, for example, it would be conceivable and possible to provide two opposing angles to the horizontal inclined rear rollers and second middle rollers, two obliquely downward tracks 24 of the carcass rail 20 and two obliquely upward tracks 14 of the drawer rail 10 would be provided with these Cooperating rollers and inclined at corresponding angles to the horizontal.

Legend to the reference numbers:

1

furniture body

2

Extendible furniture part

3

slot

4

cloth

5

drilling

10

pull-out rail

11

web

12

web

13, 13 '

Downhill career

14

Upward career

15

connecting web

20

cabinet member

21

fastening leg

22

leg

23, 23 '

Upward career

24

Downhill career

25

Horizontal jetty

26

Inclined bridge

27

Inclined bridge

28

Horizontal section

30

middle rail

31

Front end

32

Rear end

33

upper support leg

34

lower support leg

35

base leg

36

base leg

37, 37 '

axis

38, 38 '

angle

39

axis

40

bevel

41.41 '

Front caster

42

Rear caster

43, 43 '

first middle roller

44

second middle roller

45, 45 '

auxiliary role

47, 47 '

axis

48

axis

49, 49 '

axis

Claims (10)

1. A pull-out base guide for pull-out furniture parts, particularly cabinets, drawers and shelves, having a carcass rail (20) which may be mounted on the furniture carcass (1), a pull-out rail (10) which may be mounted on the underside of the pull-out furniture part (2), and a centre rail (30), which is arranged between the carcass rail (20) and the pull-out rail (10) and runs differentially between these latter, on both sides of the pull-out furniture part (2), rollers (41-45) being provided for mutual displacement of the rails (10, 20, 30), characterised in that

   - at least two front rollers (41, 41'), whereof the axes (37, 37') are inclined through opposing angles (38, 38') with respect to the horizontal, are rotatably mounted on the centre rail (30) in the region of its front end (31), at least one rear roller (42) is rotatably mounted on the centre rail (30) in the region of its rear end (32) and at least two first centre rollers (43, 43'), whereof the axes (47, 47') are located parallel to the axes (37, 37') of the front rollers (41, 41'), are rotatably mounted on the centre rail (30) in its centre region, and at least one second centre roller (44), whereof the axis (48) is located parallel to the axis (39) of the at least one rear roller (42) is rotatably mounted on the centre rail (30) in its centre region,

   - the pull-out rail (10) has two mutually angled, downwardly directed tracks (13, 13') cooperating with the front rollers (41, 41') and the first centre rollers (43, 43') and at least one upwardly directed track (14) cooperating with the at least one second centre roller (44),

   - and the carcass rail (20) has two mutually angled upwardly directed tracks (23, 23') cooperating with the first centre rollers (43, 43') and at least one downwardly directed track (24) cooperating with the at least one rear roller (42).
2. A pull-out base guide according to Claim 1, characterised in that the downwardly directed track (24) of the carcass rail (20) has lateral raised portions.
3. A pull-out base guide according to Claim 2, characterised in that the rear roller (42) of the centre rail (30) and preferably also the two centre rollers (44) of the centre rail (30) has/have lateral chamfered portions (40) for lying against the obliquely projecting lateral raised portions of the downwardly directed track (24) of the carcass rail (20).
4. A pull-out base guide according to one of Claims 1 to 3, characterised in that at least two auxiliary rollers (45, 45'), whereof the axes are located parallel to the axes (37, 37') of the front rollers (41, 41') and which cooperate with the downwardly directed tracks (13, 13') of the pull-out rail (10) and with the upwardly directed tracks (23, 23') of the carcass rail (20), are rotatably mounted on the centre rail (30) in the region behind the centre rollers (43, 43', 44), at least one of the auxiliary rollers (45, 45') being arranged in a region of the longitudinal extent of the centre rail (30) which is located between the centre rollers (43, 43', 44) and the at least one rear roller (42).
5. A pull-out base guide according to one of Claims 1 to 4, characterised in that the axes (37, 37') of the two front rollers (41, 41') are inclined through an angle in the range between 30° and 60° with respect to the horizontal, these angles preferably being approximately 45°.
6. A pull-out base guide according to one of Claims 1 to 4, characterised in that axis of the rear roller (42) and the axis (48) of the second centre roller (44) are horizontal.
7. A pull-out base guide according to one of Claims 1 to 6, characterised in that the centre rail (30) has upper and lower supporting limbs (33, 34), the centre rail (30) being surrounded by the pull-out rail (10) and the carcass rail (20) having a limb (22) which projects into the region between the two supporting limbs (33, 34) and on which the tracks (23, 23', 24) of the carcass rail (20) are arranged (Fig. 2).
8. A pull-out base guide according to one of Claims 1 to 6, characterised in that the centre rail has upper and lower supporting limbs (33, 34) which are connected to one another at one side, the carcass rail (20) surrounding the centre rail (30) and the pull-out rail (10) having a limb (22) which projects into the region between the two supporting limbs (33, 34) and on which the tracks (13, 13', 14) of the pull-out rail (10) are arranged (Fig. 9).
9. A pull-out base guide according to one of Claims 1 to 8, characterised in that the first centre rollers (43, 43') and/or the second centre roller(s) (44) is/are mounted with play in relation to their respective axes (47, 47', 48).
10. A pull-out base guide according to one of Claims 1 to 9, characterised in that all rollers (41 to 45) of the pull-out guide are rotatably mounted on the centre rail (30) .

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