DE8900144U1 - Chair, especially swivel chair - Google Patents

Description

DIPL-ING. P.-C. SROKA. DR. H. FEDER, DIPL.-PHYS. DR W.-D. FEDER

PATENT ATTORNEYS & EUROPEAN PATENT ATTORNEYS DOMIN1KANERSTR. 37. P.O. BOX &Igr;&Igr;&Igr;&Ogr;3&bgr;

D-4000 DÜSSELDORF II phone «0211) 5740 22

telex 8584 550

fax (O2il) 570316

YOUR SIGN:

11-990

company

Grahl GmbH

Seating factory

3074 Steyerberg/Voiqtei

Chair, especially swivel chair

The innovation concerns a chair, in particular a swivel chair, whose seat part rests on a central

Column which is placed on a base which has several foot braces with rollers attached to the ends.

Such chairs, especially office chairs or typewriter chairs, usually have a base with four or five spokes or radiating outwards from a central hub for reasons of strength and stability.

ZO aligned foot braces, at the ends of which rollers are

- 5 are fixed or stored.

In the case of a foot with five foot struts, there is only a relatively limited circumferential area in the hub area of the foot for each strut to attach this foot strut to the central hub part, which can lead to breakages in the area of the connection points between the foot struts and the central hub part if the chair or the chair foot is subjected to higher loads.

The innovation is based on the task of designing a chair or a chair foot with the required number of foot braces in such a way that the greatest possible strength is guaranteed in the area of the connection points of the foot braces and the central hub part.

To solve this problem, the chair according to the innovation is characterized in that a total of six external foot braces are attached in pairs to three internal main braces. Since only three main braces are now attached to the central hub part, there is a sufficiently large angle area for each of these main braces to connect to the central hub part. The individual main brace can therefore be made wider than if, for example, five foot braces were attached directly to the central hub part.

The individual main strut has a radial length which is preferably less than 50 % of the radius determined by the outer ends of the outer foot struts attached to that main strut.

Further features of the innovation arise from the subclaims.

^r > The Nnuerumi is described below using the drawing, whereby the representation and description of the entire chair is omitted and only the design of the chair's foot is shown.
ID Fig. 1 a top view of a chair leg; Fig. 7. in enlarged view a cross-sectional

view along line 11-11 in Fig. 1; Fin. 3 a partial bottom view of a

chair foot, and
Ib Fi ti. k, 5 and 6 each type of cut see according to

lines IV-IV, V-V and VI-VI in Fiq.

The foot of a new office or typewriter chair shown in the drawing

2 ^r l has a central insertion or fastening sleeve 2 for the column of the chair (not shown). The insertion sleeve Z essentially forms the hub for three main struts 3 fastened to it, which are arranged at equal angular distances from one another. The insertion sleeve 2 is preferably surrounded by a stiffening ring 20. The end of each main strut 3 is followed by two foot struts 4 which enclose an angle of essentially 90 between them and which have bearing openings 10 for castors (not shown) at their outer ends.

Each foot brace 4 consists of a U-profile with downward-facing profile legs, between which a longitudinal stiffening longitudinal

rib 5 is arranged. Each base strut also has stiffening transverse ribs Cy distributed over its length and directed transversely to the profile legs.

Each main strut also consists of a U-profile with downward-facing profile legs between which two longitudinal stiffening ribs 7 are arranged. Each main strut also has stiffening transverse ribs B distributed over its length and directed transversely to the profile legs.

The longitudinal ribs 5 of two base struts 4 combined in pairs cross each other and extend to the intersection points between longitudinal ribs 7 and transverse ribs 8 of the associated main strut 3. The two longitudinal ribs of a main strut 3 extend to the intersection points between longitudinal and transverse ribs 5 and 6 of the base struts 4. The base struts (\ preferably have a width of essentially 45 to 55 mm, preferably 40 mm, while the main struts 3 have a width of essentially 35 to 65 mm, preferably 60 mm.

Each foot brace 3 is divided approximately in the middle into an inner section of greater width and an outer section of smaller width. According to the innovation, a foot protection sleeve 9 is pushed over these outer ends or sections of each foot brace 3.

Claims (11)

chutzs &pgr; sayings 1. Chair, in particular a swivel chair, the seat part of which is attached to a central column which is placed on a foot which has several foot struts with rollers attached to their ends, characterized in that a total of six external head struts (4) are each attached in pairs to three internal main struts (Z). 2. Chair according to claim 1, characterized in that the two foot struts (4) each attached to a main strut (3) enclose an angle of substantially 90. 3. Chair according to claim 1, characterized in that each foot brace (4) consists of a U-profile with downwardly directed profile legs, between which a longitudinal stiffening longitudinal rib (5) is arranged. 4. Chair according to claim 3, characterized in that each foot strut (4) has stiffening cross ribs (6) distributed over its length and directed transversely to the profile legs. 5. Chair according to claim 1, characterized in that each main strut (3) consists of a U-profile with [ downward-facing profile legs, between which two longitudinal stiffening ribs (7) are arranged. 35 6. Chair according to claim 5, characterized in ··· * » · till , , j * ( I » Il »It» -Z- d a 0 each main beam (3) has stiffening transverse ribs (B) distributed over its length and directed transversely to the profile legs. 7. Chair according to claim 1, characterized in that the main struts (3) and the foot struts (4) consist of U-profiles with downwardly directed profile legs, between which two stiffening elements (1,2,3) are arranged on each main strut (3). and a longitudinal stiffening rib (5) is arranged at each foot strut (4), that the main struts (3) and the foot struts (4) have stiffening transverse ribs ( ^b and 6) distributed over their length and directed transversely to the profile handles, and that the longitudinal ribs (5) of two foot struts (4) combined in pairs intersect and extend to the intersection points between the longitudinal ribs (7) and transverse ribs (8) of the associated main strut (3), while the two longitudinal ribs (7) of the main strut (2) extend to the intersection points between the longitudinal and transverse ribs ( b, 6) of the foot struts (4). Z5 8. Chair according to claim 1, characterized in that the foot struts (4) have a width of essentially 35 to 45 mm, preferably 40 mm, and the main struts (3) have a width of essentially 55 to 65 mm, preferably 60 mm. 9. Chair according to claim 1, characterized in that the outer ends of the foot braces (4) have a smaller width than the inner sections of the foot braces, and that over the outer ends of the foot braces foot protection sleeves - 3 (9) are pushed over. 10. Chair according to claim 1, characterized by a central insertion sleeve (2) for the chair column and by a stiffening ring (20) surrounding the insertion sleeve (2), to which the main struts (3) are connected. 11. Chair according to claims 5 and 10, characterized characterized in that the stiffening longitudinal rib (7) extends to the central insertion sleeve (2).