EP2215930B1 - Seating furniture with frame and backrest - Google Patents

Description

The invention relates to seating furniture with a frame and with a backrest attached to the frame in a backrest receptacle.

Such seating is e.g. Chairs, on whose frame a backrest is screwed on. After attaching the back, for example, screws through the backrest and the frame are inserted through and secured with nuts.

The document GB 2 346 322 A discloses a chair with frame and back according to the preamble of claim 1.

The present invention is therefore based on the problem to develop seating, which allow easy and safe installation of the backrest and in which the connecting means between the back and the frame after installation are not visible.

This problem is solved with the features of the main claim. For this purpose, the frame in the region of the backrest receiving a adjacent to a free frame end Hintergriffsnut. The backrest comprises at least one of these attached and / or molded-on sliding block with a rear handle strip. The free frame end is closed with a cap. This cap has at least one arm on both the rear handle bar and on a rear grip surface the Hintergriffsnut rests and thus the position of the backrest to the frame non-positively and / or positively secures.

Figur 1:

Stuhl;

Figur 2:

Dimetrische Ansicht des Gestells;

Figur 3:

Detail des Gestells;

Figur 4:

Dimetrische Ansicht der Lehne;

Figur 5:

Detail aus Figur 4;

Figur 6:

Dimetrische Ansicht der Sicherungsleiste;

Figur 7:

Dimetrische Ansicht der Kappe;

Figur 8:

Detail der Lehne mit einem Nutenstein;

Figur 9:

Rückansicht der Lehnenbefestigung;

Figur 10:

Längsschnitt der Lehnenbefestigung;

Figur 11:

Schnitt von Figur 9.

Further details of the invention will become apparent from the dependent claims and the following description of schematically illustrated embodiments.

FIG. 1:

Chair;

FIG. 2:

Dimetric view of the frame;

FIG. 3:

Detail of the frame;

FIG. 4:

Dimetric view of the backrest;

FIG. 5:

Detail off FIG. 4 ;

FIG. 6:

Dimetric view of the fuse strip;

FIG. 7:

Dimetric view of the cap;

FIG. 8:

Detail of the backrest with a sliding block;

FIG. 9:

Rear view of the backrest attachment;

FIG. 10:

Longitudinal section of the backrest attachment;

FIG. 11:

Cut from FIG. 9 ,

The Figures 1 - 8 show a chair (10), eg a chair (10). This comprises a frame (20), a seat shell (13) and a backrest (40).

The frame (20) of the illustrated chair (10) has on each side a pair of legs (21). The single leg pair (21) is made for example of a bent, anodized square tube made of aluminum. The tube here has a width normal to the plane of the FIG. 1 of 30 millimeters and a height of 21 millimeters. Its wall thickness is two millimeters.

The single leg pair (21) has two legs (22, 23) which together make an angle of e.g. 30 degrees and are connected by means of a longitudinal member (24). The latter is inclined, for example, by two degrees to the standing plane (1) of the chair (10). At the front of the chair (10), the upper side of the longitudinal member (24) in the exemplary embodiment is 454 millimeters above the standing plane (1).

On the inner sides of the pair of legs (21) in each case a spacer (39) and a Sitzflächen- and backrest support (25) is attached. Here, the fastening means, such as screws from the inside of the seat and backrest support (25) mounted so that they in the side view of FIG. 1 are not visible. The two pairs of legs (21) are also connected to each other by means of two transverse bars (14, 15).

Optionally, the frame (20) may only have one e.g. central seat and backrest support (25).

In the illustrated embodiment, the single Sitzflächen- and backrest support (25) has the same cross section as the single pair of legs (21) and is made of the same material as this. The dimensions and the material of the seat back and backrest support (25) may also differ from those of the leg pair (21).

In the front area of the chair (10) follows in the side view of the FIG. 1 the Sitzflächen- and backrest support (25) of the contour of the leg pair (21). In the rear region of the chair (10), for example, it projects upwards by 180 mm, wherein the backrest receptacle (26) and the seat surface receptacle (27), for example, enclose an angle of 100 degrees.

The backrest receptacle (26) of the Sitzflächen- and backrest support (25) is in the FIG. 3 shown. Adjacent to the open end (28), the backrest side (29) has, for example, a 115 mm long longitudinal slot (31) with a width of 10 millimeters. Two, for example, semicircle-shaped bulges (32) of the longitudinal slot (31), which are spaced from each other, for example by 25 millimeters, have a width of 16 millimeters. The backrest receptacle (26) thus comprises a Hintergriffsnut (35), which is formed by the longitudinal slot (31) and the interior (33) of the carrier (25). In the exemplary embodiment, this Hintergriffsnut (35) is designed as a T-shaped groove (35), wherein the rear grip surfaces (34) on the longitudinal slot (31) adjacent inner surfaces of the square tube, see. FIG. 11 ,

On the backrest receptacle (26), the backrest (40) is attached. The in the FIG. 4 illustrated backrest (40) is for example an injection molded part made of a thermoplastic material, for example polypropylene. This material can be glass fiber reinforced. In the exemplary embodiment, the backrest (40) has a backrest shell (41) with a thickness of 6 millimeters. At its upper end, the back shell (41) has a constant radius of curvature of 445 millimeters. The back shell (41) can be covered with fabric, leather, etc.

In the side areas of the rear side (42), in each case four equally spaced guide blocks (43-46) are integrally formed on the backrest shell (41), cf. the FIGS. 4 and 5 , They are produced, for example, together with the back shell (41) in an injection molding process. The width of the in the Anspritzbereich (54), for example, 15 millimeters long and, for example, 12 millimeters high guide blocks (43 - 46) is in the embodiment 9.5 millimeters. All guide blocks (43 - 46) are in the injection area (54) a transversely arranged recess (47) into which a threaded bore (48) opens.

The guide blocks (43-46) can also be screwed to the back shell (41). For example, then the single guide block (43 - 46) has a through hole and the back shell (41) has a thread or a threaded insert. For example, this back shell (41) may be a wooden shell.

It is also conceivable to use only one guide block for each backrest attachment, which is then e.g. the length of all four molded guide blocks (43 - 46) has.

The uppermost (43) and the lowermost guide block (46) each have an outwardly excellent nose (49, 56). In the exemplary embodiment, the uppermost guide block (43) has a rectangular centering shoulder (51) and the lowermost guide block (46) has a round centering shoulder (52).

The two middle guide pads (44, 45) are e.g. constructed identically to each other. At their upper end they have a transverse strip (53) adjacent to the injection region (54), whose height is e.g. 2.4 millimeters and the width is 16 millimeters.

On the guide blocks (43-46) sits, for example, a positive fit on the Zentrierabsätzen (51, 52) a fuse strip (61), see. FIG. 8 , This is for example by means of fastening screws, such as Allen head screws (62) with hexagon socket attached to the guide blocks (43 - 46). In the exemplary embodiment, the sliding surface (68) of the securing strip (61) facing the back shell (41) encloses an angle of, for example, one degree with this region of the back shell (41). in this connection is the imaginary vertex of the enclosed angle below the backrest (40). The guide pads (43-46) and the fuse strip (61) together form a T-nut (71). The securing strip (61) forms the rear grip strip (61) of this sliding block (71).

The fuse strip (61) is made for example of a thermoplastic material by injection molding. It is as an item in the FIG. 6 shown. Their total length is in the exemplary embodiment 114 millimeters, their largest width is 20.5 millimeters and their thickness is seven millimeters. On its upper side it has recesses (63) for the fastening screws (62). The fuse strip (61) may also be wedge-shaped.

For example, open the recesses (63) on both sides in paragraphs (69) on which rest the screw heads. The paragraphs (69) are asymmetrical to the center line of the fuse strip (61). This can be adjusted by turning the fuse strip (61) to different strengths of the fabrics of the back shell (41).

The fuse strip (61) may also be integrated in the backrest (40), e.g. it can be molded to these. The connecting means (62) and the centering shoulders (51, 52) of the guide blocks (43 - 46) are then not required.

On both longitudinal sides (64) of the fuse strip (61) each have a spring hook (65) is arranged. This comprises an outwardly projecting locking cam (66). In the unloaded state, cf. FIG. 6 , the spring hook (65) protrudes to the outside. For receiving the loaded spring hook (65) has the side portion of the fuse strip (61) recesses (67). In the loaded condition the locking cams (66) immersed in the recesses (67) are flush with the side surfaces (64).

The free end (28) of the frame (20) is closed by means of a cap (80), cf. the FIGS. 1 . 9 and 10 , This cap (80) is as an item in the FIG. 7 shown. It has a head portion (81) and two long, mirror-inverted arms (85).

Which in the representation of the FIG. 7 For example, downwardly tapering arms (85) have a length of 125 millimeters, a height of 16 millimeters and a width of 8 millimeters. The distance between the two arms (85) to each other is for example 9.5 millimeters.

Both arms (85) have on the sides facing each other a shoulder (86) with a bearing surface (87) and a normal to the top (89) oriented guide surface (88). The wedge-shaped bearing surfaces (87) with the top (89) and the bottom (91) of the arms (85) each at an angle of one degree. In the area of the guide surfaces (88), the width of the arms (85) is reduced by half.

At least approximately centrally in each guide surface (88), a locking groove (92) oriented normal to the upper side (89) is arranged. Their width is e.g. 4 millimeters.

The head region (81) has an eg stepped transverse bore (82). This can be closed, for example, with a closure lid. Also, it can be attached to an armrest. With the arms (85) facing contact surface (83), the mounted cap (80) rests on the frame tube (25). There it is centered eg in the recesses (37).

To mount the chair (10), first the frame (20) is mounted. At this then, for example, the seat (13) is attached.

On the guide blocks (43-46) of the backrest (40), the securing strips (61), e.g. fastened by means of the fastening means (62). The two-sided guide pads (43-46) and / or the fuse strips (61) may be identical or e.g. be mirror images of each other. After assembly, the securing strips (61) have no backlash (40), so that the neck (72) of the T-nuts (71) after attachment of the fuse strip (61) to the backrest (40) has a fixed length.

The length of the neck (72), depending on the reference (55) of the back shell (41), see. FIG. 11 , be different. For example, the neck (72) cover-free back shell (41) may be shorter than in a back shell (41) with a thick leather cover. To adjust the neck length to the cover (55), the height of the guide pads (43-46) and / or the height of the safety strip (61) may be adjusted. Optionally, the height compensation can also be done by means of an adapter component.

The backrest (40) is attached to the free ends (28) of the frame (20) in such a way that the T-slot nuts (71) protrude into the T-shaped grooves (35). The backrest (40) is pushed so far until the transverse strips (53) engage in the bulges (32) of the longitudinal slots (31), cf. FIG. 9 , For example, the lower end (56) projecting beyond the lower end (36) additionally secures the backrest (40) against lifting off, cf. FIG. 10 , For example, the upper lug (49) is flush with the upper end (28) of the seat back and back support (25). This can eg as additional control for the correct seat of the backrest (40) can be used. The backrest (40) is so - fixed without tools - in the frame (20).

Now the cap (80) is placed on the free end (28). In this case, the arms (85) are introduced into the inner space (33) of the frame tube (25) such that the bearing surfaces (87) face the sliding surface (68) of the securing strip (61) and the guide surfaces (88) face the lateral surfaces (64). the fuse strip (61) facing. At the same time, the lower sides (91) of the arms (85) face the rear grip surfaces (34).

When inserting the cap (80), the wedge-shaped bearing surfaces (87) pull the backrest (40) against the frame (20) by means of the T-slot nuts (71). In this case, the bearing surfaces (87) slide along the wedge-shaped sliding surfaces (68) of the sliding blocks (71). By means of this wedge gear (68, 87), the backrest (40) is pulled firmly against the frame (20). The pull-out protection (11) formed by the transverse strips (53) and the bulges (32) in this case prevents the backrest (40) from slipping relative to the frame (20) in a form-fitting manner.

Upon further insertion of the cap (80), the spring hooks (65) are pressed until the locking cams (66) - when further inserted - engage in the locking grooves (92), cf. FIG. 9 , The locking cams (66) and the locking grooves (92) thus form a positive-fit cap pull-out protection (12). The cap (80) is after insertion with the contact surface (83) on the frame tube (25). It can not be pushed further, nor can it be pulled out. This assembly can be done without tools.

Optionally, the chair (10) can be designed so that the backrest (40) after its insertion with the necks (72) of the T-nuts (71) at the lower ends (36) of the T-shaped grooves (35) is seated. The chair can then be designed without the transverse strips (53) and the bulges (32).

It is also conceivable to carry out the chair (10) without the pull-out safety device (11) and the cap pull-out safety device (12). Optionally, the wedge angle of the wedge gear (68, 87) is then smaller than described. The position of the backrest (40) relative to the frame (20) is then secured only frictionally. This assembly may require the use of a hammer.

Instead of the described wedge gear, the wedge gear can also be arranged between the cap (80) and the rear grip surface (34). For this purpose, on the rear grip surface (34), for example, a wedge-shaped adapter, e.g. glued.

Optionally, the chair (10) can be designed without wedge gear. The support surface (87) is then e.g. parallel to the top (89). Likewise, the sliding surface (68) is then parallel to the back shell (41). The position of the individual components (20, 40, 80) to each other is then e.g. only positively secured by means of the pull-out protection (11) and the cap pull-out protection (12). The dimensions and tolerances of the cap (85) and the sliding block (71) are then e.g. chosen so that after mounting a rattle is effectively prevented.

The cap (80) may comprise a single arm (85) instead of two arms (85). This is then, for example, with its underside (91) on a rear grip surface (34) and with the support surface (87) on a sliding surface (68).

The sliding block (71) may be L-shaped. For example, the rear grip strip (61) then projects only on one side over the guide blocks (43-46).

Likewise, it is conceivable to form the T-shaped groove (35) described Hintergriffsnut (35) L-shaped. For example, it then has only one side in the interior (33) to the longitudinal slot (31) adjacent the rear grip surface (34).

In the assembled state, cf. the FIG. 1 and the back view of the FIG. 9 , neither on the back shell (41) nor on the frame (20) fastening means for attaching the backrest (40) on the frame (20) are visible.

Combinations of the various embodiments are conceivable.

LIST OF REFERENCE NUMBERS

1

Ground level

10

Seating furniture, chair

11

pull-out protection

12

Cap runner safety

13

seat

14

transverse spar

15

transverse spar

20

frame

21

pair of legs

22

leg

23

leg

24

longitudinal beams

25

Seat and backrest support, support, frame tube

26

back support

27

Seat recording

28

Free end of frame, free end of (25)

29

backrest side

31

longitudinal slot

32

Bulges, groove widening

33

inner space

34

Behind grips

35

Rear grip groove, T-shaped groove

36

lower end of (35)

37

recesses

39

spacer

40

rest

41

backrest shell

42

back

43

guide block

44

guide block

45

guide block

46

guide block

47

recess

48

threaded hole

49

nose

51

centering

52

centering

53

Stop bar, cross bar

54

injection area

55

reference

56

nose

61

Rear handle strip, fuse strip

62

Fixing screws, pan head screws

63

recesses

64

Long sides, side surfaces

65

spring hooks

66

locking cams

67

recesses

68

Sliding surface, wedge surface, part of the wedge gear (68, 87)

69

paragraphs

71

T-nut, T-slot nut

72

Neck of (71)

80

cap

81

head area

82

cross hole

83

contact surface

85

poor

86

paragraph

87

Bearing surface, part of the wedge gear (68, 87)

88

guide surface

89

Top of (85)

91

Bottom of (85)

92

locking notch

Claims (8)

1. Seating furniture (10) comprising a frame (20) and a backrest (40) secured to frame (20) by a backrest receiving mechanism (26), characterized in that

   - frame (20) has therein in the region of backrest receiving mechanism (26) a grip-behind groove (35) which extends to a free frame end (28);

   - backrest (40) has at least one sliding block (71) secured thereto and/or formed integral therewith, said sliding block comprising a grip-behind ledge (61);

   - free frame end (28) is closed by means of a cap (80);

   - said cap (80) has at least one arm (85) engaging both ledge (61) and an grip-behind surface (34) of groove (35), thereby securing the position of backrest (40) relative to frame (20) in a positive fit and/or an interference fit.
2. Seating furniture (10) as claimed in claim 1, characterized in that backrest (40) has an abutment ledge (53) gripping into an expanded portion (32) of grip-behind groove (35).
3. Seating furniture (10) as claimed in claim 1, characterized in that grip-behind groove (35) comprises a T-groove (35).
4. Seating furniture (10) as claimed in claim 3, characterized in that sliding block (71) comprises a T-block (71).
5. Seating furniture (10) as claimed in claim 1, characterized in that sliding block (71) has at least one catch lobe (66) engaged by cap (80).
6. Seating furniture (10) as claimed in claim 1, characterized in that backrest (40) comprises a backrest shell (41), said backrest shell having at least a portion of sliding block (71) formed integral therewith.
7. Seating furniture as claimed in claim 1, characterized in that cap (80) has two spaced arms (85) shaped to form wedges.
8. Seating furniture as claimed in claim 1, characterized in that cap (80) and sliding block (71) jointly form a wedge-type transmission.

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