EP0179357A2 - Chair - Google Patents

Abstract

The seat furniture is provided with a seat-plate backrest inclination-adjusting mechanism (6), a single-column supporting device (2) and a supporting foot (1). The backrest is composed of a backrest bottom part (16) and a backrest top part (14), and when the backrest inclination is fixed the backrest top part (14) can additionally be moved, counter to the pressure exerted by a restoring-spring arrangement (13), so as to swing freely to the rear between a first and a second stop position of an adjusting-spring device (22).

Description

The invention relates to seating that is defined by the preamble of claim 1.

Such high-class seating furniture are generally provided with a seat plate / backrest adjustment mechanism. It is characteristic that the backrest tilt adjustment is in a rigid proportionality to the backrest tilt adjustment, which is also oriented backwards. Such seating furniture can be found in Swiss Patent No. 629 945, in which a work chair for steplessly changing the seat plate and backrest inclination adjustment is described. The associated adjustment mechanism contains, in addition to a gas pressure spring, a helical compression spring connected in parallel with the latter, the gas pressure spring also fulfilling the function of an actuator in addition to its function as a spring element. The aforementioned spring element parallel connection aims to increase the backrest deflection to the rear against a progressively increasing spring force, the resulting adjustment movement being effected by moving the upper body of the chair user backwards. By relieving the load on the backrest, it, together with the seat plate, returns to a position with a lower backward inclination or finally to its approximately perpendicular starting position. The movement game can run with free the gas pressure spring can be repeated as required. By switching the gas pressure spring as an actuator, the movement play can be stopped in any backrest inclination position, thereby fixing the backrest position.

Thus, it is possible to prevent the pendulum movement of the seat-backrest combination or the adjustment mechanism from continually swinging, which can be undesirable, in particular if the weight is shifted slightly, by the user. At the same time, however, the seating furniture loses an essential comfort component: the automatic adjustment of the backrest inclination if the user wants to lean back for a short time without unblocking the adjustment mechanism. There is a need for such mobility of the backrest, in particular, if the seating furniture is to offer the possibility of being adaptable to different forms of use quickly and without actuating the adjusting means.

The problem to be solved according to the invention on a piece of seating furniture of the type defined at the outset is therefore to improve the function of the backrest by further developing the adjustment mechanism in such a way that the section serving the shoulder support and the support of the middle region of the spine of a user also with a blocked adjustment mechanism and regardless of its blocking position, it can still be pivoted backwards depending on the pressure.

A further task is that, based on a basic construction that enables the aforementioned additional backrest pivoting, a To create control and support device for a headrest on the seat, which is pivotally arranged above said backrest section.

A third object to be achieved according to the invention relates to the design of an armrest in which the ends of an armrest and a support section are mounted on pivot pins which are attached to points of the seating structure which can be pivoted relative to one another.

Finally, the object to be achieved according to the invention relates to the design of a single-column support foot for the seating furniture, which can be provided with interchangeable support elements.

The solutions to these problems are defined by the characterizing features of independent claims 1, 11 and 15. Auafuehrungeformen thereof emerge from the respectively associated dependent claims.

• Fig. la, lb das Sitzmöbel nach der Erfindung in einer ersten Ausführungsform, teilweise in der Vertikal-Mittenebene geschnitten, in zwei Extremstellungen von Sitzplatte und Rückenlehne,
• Fig. 2a, 2b das Federaggregat der Rückenlehnen-Pendelvorrichtung in grösserem Massstab, in zwei um 90° zueinander stehenden Schnittdarstellungen,
• Fig. 3 einen vereinfachten Schnitt nach der Linie III-III in Fig. la,
• Fig. 4, 4a einen Horizontalschnitt nach der Linie IV-IV in Fig. la, und einen Vertikalschnitt nach der Linie a-a in Fig. 4,
• Fig. 5a, 5b das Sitzmöbel nach der Erfindung in einer zweiten, mit einer Kopfstütze versehenen Ausführungsform, in gleicher Darstellungsweise wie in den
• Fig. la, lb, Fig. 6, 6a-6c die Armlehne am Sitzmöbel nach den Fig. la und 5a im Längsschnitt, einer Querschnittsdarstellung (Fig. 6a) und Detaildarstellungen der Armlehnenkern-Führungstasche im Grundriss (Fig. 6b) und Gelenkbereich (Fig. 6c), und
• Fig. 7, 7a, 7b den Tragfuss des Sitzmöbels nach den Fig. la und 5a in einer Partialdarstellung eines Tragarms in Seitenansicht (Fig. 7), im Vertikal-Längsschnitt (Fig. 7a) und im Querschnitt (Fig. 7b).

The invention is explained below, for example with reference to the drawing. It shows:

• La, lb the seating furniture according to the invention in a first embodiment, partially cut in the vertical center plane, in two extreme positions of the seat plate and backrest,
• 2a, 2b the spring assembly of the backrest pendulum device on a larger scale, in two sectional views at 90 ° to each other,
• Fig. 3 shows a simplified section according to the Line III-III in Fig. La,
• 4, 4a is a horizontal section along the line IV-IV in Fig. La, and a vertical section along the line aa in Fig. 4,
• Fig. 5a, 5b, the seating furniture according to the invention in a second embodiment provided with a headrest, in the same representation as in the
• Fig. La, lb, Fig. 6, 6a-6c the armrest on the seat according to Figs. La and 5a in longitudinal section, a cross-sectional view (Fig. 6a) and detailed views of the armrest core guide pocket in the plan (Fig. 6b) and joint area ( Fig. 6c), and
• 7, 7a, 7b the supporting foot of the seating furniture according to FIGS. La and 5a in a partial representation of a supporting arm in a side view (FIG. 7), in a vertical longitudinal section (FIG. 7a) and in cross section (FIG. 7b).

Parts of the same configuration that have the same or the same function in the different figures are identified by the same reference number.

The seating furniture shown in FIGS. 1 a and 1 b is supported on a single-column support foot 1, which is supported by a height-adjustable support column 2, for example a gas spring, with the seat cap 3.1 of a support arm 3 on a seat support frame, generally designated 4. The support column 2 is expediently surrounded by a casing 5 which is formed, for example, from two telescopically interlocking tubular members. Terms Details of a preferred embodiment of the support foot are made to FIGS. 7, 7a and 7b.

The seat support frame 4 contains components of a device, also referred to below as a synchronous adjustment mechanism 6, of which FIGS. shows a controllable gas spring 7 with the piston rod 8 in the extended position. At the distal end of the aforementioned piston rod 8, the lever arm 9 of a backrest connection structure 10 is articulated, which is pivotably mounted about a shaft 11. Through the synchronous adjustment mechanism 6, of which one embodiment is described in CH-PS No. 636 252, the elements of the seat plate and the backrest 14, 16 constructed on the seat support frame 4 are pivoted in the same direction and as a function of one another. The lever arm 9 is firmly connected to a support tube 12. An angled upper back part 14, shown in detail in FIG. 2, is also connected to it.

A lever (not shown) also present on the seat support frame 4 enables an overflow valve in the gas spring to be actuated, which allows the piston rod 8 of the gas spring 7 to be displaced in the open position, but blocks the piston rod in the closed position. Pushing the piston rod 8 inward (see FIG. 1b) into the gas spring cylinder causes the backrest connection structure 10 to pivot clockwise and thus to move the backrest 14, 16 into the position according to FIG. 1b. However, this swiveling movement only occurs if, when the overflow valve of the gas spring 7 is open, a swiveling force P is applied at the same time, preferably by leaning back the user of the seating furniture.

Back to Fig. La: The ejected gas spring piston rod 8 has the consequence that the slide assembly 13 together with the support arrangement 16 of the frame 17 of the upper part of the backrest connected to it is pushed into an approximately vertical position. The latter contains a shell-shaped rounded component 17 'which is pivotally articulated on the side ends of the support arrangement 16 via a pair of hinges 19 at the bearing point 18. The component 17 'is expediently a plywood shell, the lower edge of which is supported at 21 on the slide member 20. An actuating spring device 22 has the effect that the backrest frame 1T is always held firmly against the slide member 20. The spring device 22 consists essentially of an elongated leaf spring 23 which is screwed onto the slide assembly 13 at the bottom and extends up into the backrest frame 17, and a guide pocket 24 fastened thereon, the details of which can be seen in FIGS. 4 and 4a and are described later. .

For the time being, however, the construction of the slide assembly 13 will be explained with reference to FIGS. 2a and 2b. 3 shows its installation in the support arrangement 16.

2a and 2b show the slide assembly 13 on a larger scale and in two cuts at 90 ° to each other. A perpendicular rectangular tube 25 is welded onto the support tube 12 of the synchronous adjustment mechanism 6. In this, the slide member 20 is mounted for longitudinal movement over a distance of approximately 1.5 ÷ 2 cm. The path of movement is given by elongated holes 27 which are penetrated by tubular bolts 28 mounted in the rectangular tube 25. The slide member 20 is under pressure from strong coil springs 29, the zwi see its underside provided with spring guides 31 and the support tube 12 are inserted with bias. As already mentioned, the upper end 32 of the slide member 20 is in pressure contact with the lower end of the component 17 ′ from the backrest frame 17.

The position of the slide unit 13 within the support arrangement 16 can be seen in FIG. 3. In this figure, 12 denotes the support tube which is mounted in fork brackets 33 of the synchronous adjustment mechanism 6 mentioned. With 9 'corresponding to the lever arm 9 of Fig. La tabs, and with 34 a pair of brackets parallel to the tabs 9' of the synchronous adjustment mechanism 6 according to CH Patent No. 636 252. The support arrangement 16, which is welded sideways to the rectangular tube 25, contains a frame construction 35, not shown in detail, of individual supports, each of which is connected to a vertical frame member 36 at its outer ends. An axle pin 38 sits on this in a casing 37, which carries a hinge element 39 on its inwardly projecting end for articulating the backrest frame 17 shown with a broken line. The outwardly projecting end 40 is intended for receiving the upper joint sleeve 41 on the armrest (FIG. 6). FIG. 3 further shows the fastening of the elongated leaf spring 23 to the rectangular tube 25 of the slide unit 13.

In Fig. 4, the backrest frame 17 is shown in section along the line IV-IV in Fig. La. The component 17 ', which is shaped, for example, as a plywood shell, is, as mentioned, at the bottom / outside each in a dashed line and is detailed in FIG described pivot bearing 37/38/39 held. The guide pocket, generally designated 24, for the leaf spring 23 is attached essentially centrally to the backrest component 17 '. According to FIG. 4a, it consists of a stop housing 42 with an elongated cavity 43, in which a cam 44 placed or formed on the leaf spring 23 can move longitudinally between two end stops 45.1, 45.2. The cam position at the lower end stop 45.1 fixes the backrest position in approximately axial alignment with the slide unit 13, while the cam position at the upper end stop 45.2 coincides with an approximately clockwise deflection of 15t20 ^{0 of} the upper backrest part 14 'into the position shown in broken lines.

The functioning of the described seating furniture can now be explained. For this purpose, it is assumed that the synchronous adjustment of the relative inclinations of seat plate 15 and backrest 14, 16 mentioned at the outset is known and therefore no longer needs to be shown. In other words: The creation of the different seat plate and backrest inclinations on the seated furniture shown in solid lines in FIGS. 1a and 1b is assumed to be known. It is thus clear that, in any of these inclined positions, the Achsialausrichtung between the Schieberaggre ^g at 13 and the seat back frame 17 remains the same, if not above the bearing 18 a pressure force Q is exerted on the seat back upper part fourteenth Such a force Q occurs when the user of the seating furniture with a locked gas spring, i.e. a fixed inclination position or with a full inclination adjustment and free-running gas spring piston rod 8 (to additionally) want to move further back to take a more relaxed body position. When the force Q is exerted, the lower end of the backrest frame component 17 'which can be pivoted backwards about the bearing point 18 acts at the point 21 on the spring-loaded slide member 20 (see FIG. 2) of the slide unit 13. When a compressive force Q is reached, at which the bias of the coil springs 29 is overcome, the backrest 14 begins to pivot clockwise. In this case, the slide member 20 is pushed downward against the progressively increasing preload of the springs 29 into an equilibrium position corresponding to the size of the pressure force Q, ie the additional inclination of the backrest is dependent on the pressure force Q and disappears again when the latter becomes zero.

As already mentioned at the description of Fig. 2, the movement path of the Schieberglie- is limited _I of 20 by the length of the oblong holes 27. The utilization of the possible slide path would mean that the backrest upper part 14 would be hit hard with full deflection. This is avoided by the actuating spring device 22 as follows: The leaf spring 23 has two kink points 46.1 and 46.2 above the slide unit 13, by means of which the leaf spring 23 is given longitudinal elasticity in addition to a clockwise bias. The latter has the result that a soft braking effect results when the cam 44 hits the upper end stop 45.2 (FIG. 4a). Said pivoting bias causes the leaf spring 23 not to bend outwards but rather inwards against the component 17 'when the longitudinal pressure increases.

By mutually optimal adjustment of the bias of the coil springs 29 and the length of the elongated holes 27 on the slide assembly 13, the size of the longitudinal elasticity of the leaf spring 23 and its pivoting bias by means of the kinks 46.1 and 46.2, and the free movement of the cam 44 in the guide pocket 24 can achieve a value for the deflection pressure force Q and a largely impact-free braking of the deflection movement of the upper backrest part 14 in its position 14 '.

5a and 5b can be provided with relatively simple means with an ergonomic criteria headrest 51 according to the principle described above. It is thus possible in a simple manner to create a seating furniture that meets the highest comfort requirements and in which the same or adapted components of the construction described are used. The explanations below are therefore fundamentally based on the construction according to FIGS. 1 a and 1 b, and components already described there are only mentioned or discussed below if they have to meet different requirements.

5a and 5b, the seating furniture parts are designed from the bottom up to the height of the lines KK as described above. At the upper end of the backrest frame 17, a headrest frame 53, which carries the headrest padding 53 ", is built up via a hinge joint 52 provided on both sides. The headrest frame 53 can in principle contain a plywood shell part 53 'bent according to the component 17' La, lb with 23 designated leaf spring is extended beyond the guide pocket 24 to about 1/3 the height of the headrest frame 53 and hereinafter referred to as 54. Up to the height of the line KK, it also corresponds in shape to the leaf spring 23. At the height of the hinge joints 52, it is provided with a pre-curvature 55 which is stiff enough on the one hand to support the basic position of the leaf spring, which is still only supported by the hinge joints 52 Headrest scaffolding. Furthermore, the leaf spring 54 is fixedly connected to the headrest frame 53 at its upper end.

When the backrest frame 17 is pivoted back into the position shown with broken lines, the leaf spring 54 also moves upward analogously to the displacement of the cam 44 in the guide pocket 24. Since the hinge joints 52 only allow the distance to be increased in the middle of the backrest of the curved shell parts 17 'and 53', the leaf spring 54 must be aligned precisely with this zone. When the leaf spring 54, which is firmly connected to the headrest frame 53, is pushed upward, the headrest frame 53 pivots into a pivoting position, narrowing the pre-curvature 55, in which it is approximately parallel to the basic position at a distance. The counterclockwise inclination of the headrest 51 in its position shown with a broken line depends - apart from the movement path of the leaf spring 54 - essentially on the horizontal distance of the connecting line between the hinge joints 52 and the leaf spring 54. In other words, the headrest tilt adjustment can be done by moving the pivot point forwards or backwards on the hinge joints 52 can be selected.

Both the seating furniture according to FIGS. La, 1b and according to FIGS. 5a, 5b can be provided with armrests 61 on both sides. These armrests are articulated on the one hand at the front end of the seat frame 4 on the synchronizing mechanism 6 at 62, and on the other hand on the bearing point 18 of the backrest frame 17. In accordance with the mutual adjustability of the two bearing points 18 and 62, which results from the description of FIGS. La, lb, the armrests 61 are also articulated in order to be able to follow the adjustment movement mentioned. Since these armrests, which emerge from FIG. 6 in a schematic longitudinal sectional illustration, are designed in the same way for the left and for the right side of the furniture, only one armrest should preferably be referred to below.

In FIG. 6, 41 denotes the upper joint bushing at the “rear” end of the armrest, which was already mentioned in connection with the description of FIG. 3. It is mounted on the journal 38 shown there. An articulated bushing 63, which is of basically the same design, fixes the front end of the armrest 61. The articulated sleeve 63 is mounted in the bearing 62 (FIGS. 1 a, 5 a) on a further axle journal, not designated, which is connected to the seat frame 4 and is similar to the axle journal 38. Both joint bushes 41, 63 each carry a leg core 64, 65, for example in the form of a flat iron band, at the distal end of which a leg bend 66, 67 is provided. The leg bends 66, 67 each of 1 to 2 cm in length are practically the same and at an angle of 35 to 60 ° from the straight line steered, and placed at the armrest bending point 68 one above the other so that the underside of the bend 66 of the upper leg core 64 is opposite the upper side of the bend 67 of the lower leg core 65. Both thigh cores are on the one hand held in exact alignment with one another by the joint bushes 41, 63 and on the other hand are held in their mutual relationship in a pocket 69 made of a flexible covering material, for example a plastic-coated textile.

6a shows the section along the lines ^a ₁ -a ₁ and a ₂ -a ₂ in FIG. 6, FIG. 6b shows the pocket in the stretched-out position when empty, and FIG. 6c shows the pocket profile at the bending point 68 in on a larger scale.

6a, the leg cores 64, 65 are surrounded by the relevant pocket sections 69.1 and 69.2 (FIG. 6b) and embedded in a foam casing 70. The latter is surrounded by a cushion cover 71, which extends over the entire armrest and expediently leaves the two joint bushes 41, 63 free. 6b and 6c show the design of the pocket 69. Longitudinal seams 72 define the width, and transverse seams 74.1, 74.2 define the longitudinally overlapping lengths for the receiving openings 73.1, 73.2 (see also FIG. 6c) for the leg cores 64, 65 . 6c that the upper leg core 64 and the lower leg core 65 or their end bends 66, 67 are separated from one another at the armrest bending point 68 by a pocket double 75 located between the transverse seams 74.1 and 74.2. The pocket double 75 avoids direct contact of the leg end bends 66, 67 (FIG. 6) and is expediently appropriately reinforced.

7, 7a and 7b is the supporting foot 1. from Fig. La and a leg 81 of the preferably five leg support leg shown on a larger scale and with more details. Each of the legs 81 is connected to a central support hub 82, which is provided for receiving the preferably height-adjustable support column 2 mentioned earlier. For this purpose, the support foot 1 contains for each leg 81 a spoke designated 83, which projects radially from the hub 82 and is firmly connected to the latter. The spoke 83 is expediently a rectangular tube and is designed as a base element on which a radial extension and support of a support element 84, e.g. a pendulum roller, a claw member 85 is attached. The spoke 83 further carries the lower part 86 of the support pillar casing designated by 5 in FIG. 1 and a basic casing 87, which (in a manner not shown) is connected to the lower casing part 84 in such a way that both parts 86, 87 both with one another and with the spoke 83 are in clamp engagement and are removably connected to them.

The claw member 85 is a shell body with an essentially semicircular shell wall 88, on the inside of which a rib structure 89 for the fastening parts of the support element (roller) 84 and a plug centering 91 are formed. The shell wall 88 also carries a mounting pin 92 which passes through an opening 93 on the top of the spoke 83 and extends to the underside 83 'thereof. In the assembled state of the claw member 85, the plug centering 91 engages in the front end of the spoke cavity 83 ″, whereby a tilt-proof mounting of the claw member 85 on the spoke 83 can be achieved Side of the spoke 83 penetrating and engaging in the mounting pin 93 screw 93 and spoke claw 85 are firmly connected.

The advantage of such a support foot design is that support feet with legs 81 of different lengths and for differently designed support elements 84 can be assembled on a support foot base provided with spokes 83 of uniform length and shape. On such support elements 84, only the parts 91 and 92 necessary for attachment to the spoke 83 need to be designed identically in order to rationally design support feet for different purposes.

Claims (17)

1. Seating furniture with a seat plate backrest inclination adjustment mechanism, by means of which a change of inclination of the seat plate and the backrest that is effective in the same direction and as a function of one another can be achieved, and wherein the inclination adjustment between a first position in which the backrest assumes an at least approximately vertical position and a second Position in which the backrest assumes an inclined position to the rear, takes the form of a pendulum movement, or can be freely selected and fixed by blocking the inclination adjustment mechanism in a desired inclined position of the backrest, characterized in that the backrest consists of a device with the inclination adjustment mechanism (6 ) firmly connected lower backrest part (16) and a pivotable articulated backrest upper part (14), which is acted upon by a compressive force (Q) around a bearing point (18) connected to the lower section (16) between a first one n, can be freely pivoted by a first stop device (44, 45.1) and a second position limited by a second stop device (44, 45.2), the upper backrest part (14) in the first position by a spring-loaded device (13) present in the lower backrest part is held in an essentially axially aligned position with the lower backrest part. 2. Seating furniture according to claim 1, characterized in that the lower backrest part is designed as a support arrangement (16) for the frame (17) of the upper backrest part (14) and the spring-loaded device (13) as part of the support arrangement (16). 3. Seating furniture according to claim 2, characterized in that the spring-loaded device is a slide unit (13) with a slide member (20) movable between two end positions under spring load (29), and that the slide member (20) with the lower end of the backrest shell ( 17 ') is engaged. 4. Seating furniture according to claim 1, characterized in that between the lower back part (16) and the upper back part (14) there is a control member in the form of an adjusting spring device (22), which with the first and the second stop device (44, 45.1; 44 , 45.2) cooperates. 5. Seating furniture according to claim 4, characterized in that the spring device (22) comprises an elongated leaf spring (23) attached to the lower backrest part (16), which on the upper backrest part in one of the first and second stop devices (44, 45.1; 44, 4. _{5 2} ) containing guide pocket (24) is guided lengthwise. 6. Seating furniture according to claim 5, characterized in that the leaf spring (2 ₃ ) between the lower backrest part (16) and said stop devices pair of kinks (46.1, 46.2), of which the lower (46.1) deflects the leaf spring (23) against the backrest frame (17), and the upper (46.2) deflects the leaf spring (23) away from the backrest frame (17). 7. Seating furniture according to claim 2, characterized in that at the upper end of the backrest frame (17) a headrest (51) carried by a headrest frame (53) is pivotally articulated. 8. Seating furniture according to claim 7, characterized in that between the backrest frame (17) and the headrest frame (53) a leaf spring (54) formed from hinge joints (52) and a rear of the hinge joints at a distance formed pivot point is present. 9. Seating furniture according to claim 8, characterized in that the leaf spring (54) on the backrest frame (17) between the first and the second stop device (44, 45.1; 44, 45.2) is longitudinally displaceable and in the region of the said pivot point with a bend (55) is provided, by means of which the headrest frame (53) is pivoted toward the seat plate (15) relative to the backrest frame (17). 10. Seating furniture according to claim 9, characterized in that the extent of said pivoting depends on the extent of the deflection of the upper backrest part (14), and that the degree of curvature of the bend (55) increases with increasing deflection of the upper backrest part (14). 11. Armrest on one of the claims 1 to 10 designed seating, characterized by a at a first bearing point (18) between the lower backrest part (16) and upper backrest part (14) pivotably articulated upper armrest legs, a second bearing point (62) on the front End of the seat support frame (4) pivotably articulated lower armrest legs, and an armrest bending point (68) formed at the abutment point of said armrest legs, at which the upper and lower armrest legs can be pivoted relative to one another. 12. Armrest according to claim 11, characterized in that the upper and lower armrest legs each have an articulated sleeve (41, 63) at the end, that each armrest arm is provided with a leg core (64, 65) connected to the associated articulated sleeve (41, 63) whose distal ends each have an end bend (66, 67) which are arranged one above the other at the armrest bending point (68) such that the upper leg end bend (66) is supported on the lower leg end bend (67) and that the two leg cores ( 64, 65) are held flexibly in a certain mutual position by a guide element (69). 13. Armrest according to claim 12, characterized in that the leg cores (64, 65) consist of a dimensionally stable material, and the guide element is a pocket structure (69) made of a flexible material, in which pocket structure the leg cores (64, 65) at least part of their extent, and are held at a distance from each other at the bending point (68). 14. Armrest according to claim 13, characterized in that the leg end bends (66, 67) are separated from one another by a pocket double (75) formed at the bending point (68). - 15. Supporting foot on a seat designed according to one of claims 1 to 10 with a number of supporting foot legs (81) arranged on a central support hub (82) for receiving a support column (2), characterized in that for each of the supporting foot legs ( 81) there is a spoke (83) on the support hub (82), that each spoke (83) has a claw member (85) with fastening parts (90) for a support element (84) placed on its distal end, and that the spoke ( 83) radially inwards from the claw link (85) together with the central support hub (82) is covered with formwork elements (86, 87) which are in clamping engagement with the spoke (83). 16. Supporting foot according to claim 15, characterized in that the spoke (83) has, at least in its distal end region, a cavity (83 ") which is provided with an opening (93) which makes it accessible from above, and that the claw member (85 ) has a shell wall (88) partially encompassing the spoke end region, on the inside of which holding members (91, 92) for centering and fastening the claw link (85) to the spoke (83) are arranged. 17. Supporting foot according to claim 16, characterized in that the claw member (85) engages in the end cavity (83 ") of the spoke (83) centering part (91), and a mounting pin (92) of a screw connection (94) between the claw link (85) and spoke (83) which extends through said access opening (93). E

Images