EP0331104A1 - Fusskreuz für Stühle - Google Patents

Fusskreuz für Stühle Download PDF

Info

Publication number
EP0331104A1
EP0331104A1 EP89103487A EP89103487A EP0331104A1 EP 0331104 A1 EP0331104 A1 EP 0331104A1 EP 89103487 A EP89103487 A EP 89103487A EP 89103487 A EP89103487 A EP 89103487A EP 0331104 A1 EP0331104 A1 EP 0331104A1
Authority
EP
European Patent Office
Prior art keywords
base
fact
spokes
sheaths
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89103487A
Other languages
English (en)
French (fr)
Inventor
Emilio Badulli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kosmik Ruote SNC Di Badulli Enrica & Badulli Emilio
Original Assignee
Kosmik Ruote SNC Di Badulli Enrica & Badulli Emilio
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kosmik Ruote SNC Di Badulli Enrica & Badulli Emilio filed Critical Kosmik Ruote SNC Di Badulli Enrica & Badulli Emilio
Publication of EP0331104A1 publication Critical patent/EP0331104A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/002—Chair or stool bases
    • A47C7/004—Chair or stool bases for chairs or stools with central column, e.g. office chairs

Definitions

  • This invention concerns a supporting base for chairs and relates in particular to a spoke-type base for swivel chairs, of the type comprising a central hub for an upright bearing the seat.
  • spoke-type bases for swivel chairs and similar articles, with wheels and without pivotable wheels comprise a metal frame having a central hub made up of an annular element to which are rigidly fixed, for example by welding, arms or angularly spaced peripheral spokes, which extend radially from the above-mentioned ring; before the spokes are welded, the central ring must be suitably made conical in shape to receive the conical lower end of the swivelling upright bearing the seat.
  • the radially external end of each spoke is provided with a hole in which a pivot for a wheel or for a foot of the chair may be inserted.
  • a protective covering formed, for example by means of a paint coating, a chrome covering, or a plastic tubular sheath member, can also be provided for each spoke.
  • a first problem concerns the correct accomodation in the central hub of the upright bearing the seat; in fact, the central ring of the hub is produced starting from a cylindrical tubular element which must be deformed and shaped according to a pre-set conical angle so as to fit with the conical shape of the lower end of the upright.
  • the operation for giving the central ring of the hub a conical shape is mainly undertaken in special dies so as to enable economic and low-cost production of the workpiece; however, this operation does not allow a very precise check on the conical shape of the ring, which frequently fits poorly with the conical shape of the lower end of the upright, so making the latter unstable or incorrectly fixed to the base.
  • the tubular element from which the conical ring is obtained has variable or inconstant dimensions and characteristics which affect the shaping operation of the ring to the required conical form.
  • the operation for giving the central ring a conical shape can have other disadvantageous effects because the narrowing of the diameter at the lower end frequently causes scoring and striations on the internal surface that damage the seat-bearing upright or result in it being wrongly positioned.
  • the main object of this invention is to obviate these drawbacks by providing a structure for a spoke-type base for chairs and similar articles, of simplified design, such as to allow easy and rapid fixing of the peripheral spokes to the central ring of the hub which does not need to be deformed as happens with traditional bases.
  • a further object of this invention is to provide a base as previously defined, in which the hub has a perfectly conical seating, able to fit exactly with the conical surface of the lower end of the seat-bearing upright.
  • reference number 10 indicates the overall spoke-type base for swivel chairs, provided by a metal frame comprising a central ring 11 to the periphery of which are fixed, for example by welding, five radial spokes 15 angularly spaced apart and made up, in the example shown, of tubular elements.
  • the central ring 11, forming part of the hub for the upright bearing a seat, not shown, is in the form of a cylindrical ring member of requisite height, obtained by cutting it from a tubular element of matching diameter; in this way the ring 11 is delimited internally and externally by cylindrical surfaces concentric to the longitudinal axis of the hub.
  • a plastic sleeve member 12 having an external cylindrical surface 13a which fits within the internal cylindrical surface 13b of the ring 11; the sleeve 12 also has an internal conical surface 14 tapering downwards, which constitutes the seating accomodating an upright bearing the seat (not shown).
  • the use of a sleeve 12 obtained by moulding plastic guarantees a perfect internal conical shape corresponding to that of the seat-bearing upright, so eliminating the complex and costly mechanical working operations previously necessary.
  • the plastic sleeve 12 must be suitably fixed inside the metal ring 11 in such a way that it cannot come away under the weight of the seat or of a person sitting on it. Accordingly, as shown in figure 2, the sleeve 12 can be fixed internally to the ring 11 and can, outside its upper edge, have a shaped annular flange 12a that fits with the upper edge of the central ring 11 as well as against the upper surface of the spokes 15.
  • the upper flange 12a need not be included, or can be differently shaped, with other axial fixing means for the sleeve 12 being provided, for example by making the opposing surfaces 13a and 13b of ring 11 and the sleeve 12 conic in shape and downwardly tapering; given the adaptability of the plastic of the sleeve 12, said surfaces 13a and 13b do not require careful, high-precision working.
  • Reference number 16 indicates tubular sheath members providing a protective covering for the radial spokes 15; the radially external end 17 of the sheaths 16 is closed, while their other end 18 is open and is arch-shaped, so fitting around the ring 11 to form a continuous protective surface around the central hub.
  • the peripheral flange 12a of the sleeve 12 has projections 12b on its upper portion circumferentially spaced apart; the height of each projection 12b is less than that of the enlarged upper edge of the sleeve 12 and has an inclined front-facing surface terminating in a horizontal length which, with the edge of the sleeve 2, defines an annular stopping shoulder for the end 18 of the sheath 16.
  • the inclined front-facing surface of the projections 12b allows the open edge 18 of the sheaths to slide, so facilitating their assembling.
  • the sleeve 12 is provided with two downwardly oriented parallel tongues 19 which are positioned along both sides of the respective spoke 15, said tongues 19 having their lower ends engaging apertures 20 in the bottom face of the sheath 16, so as to prevent the latter slipping out of place.
  • other means can be provided for centring and attaching the sheaths 16 and the central sleeve 12 to the hub.
  • each spoke 15 is provided with a plug 21 firmly fixed, for example by pressure fitting or by other means, independently of the sheath 16; the plug 21 comprises a hole 22 that opens downwards and is aligned with a hole 16b in the bottom face of the sheath 16 for inserting the pivot (not shown) of a revolving wheel or of a support foot.
  • the sheaths 16 covering the spokes 15 may be in plastic material; accordingly, they can be easily made by moulding without any special manufacturing difficulties, because said sheaths can be moulded independently of the end sealing plug 21.
  • a base for chairs and similar articles comprising a metal frame having a central hub with radial spokes preferably provided with tubular covering sheaths, said hub comprising an external cylindrical ring integral with the spokes, and an inner plastic sleeve positioned coaxial to and inside the ring; the sleeve has an external surface that fits with the inner surface of the central ring, and an internal frusto-conical surface for accomodating the seat-bearing upright; attaching means may be provided for holding the sleeve and the covering sheaths connected to the metal frame.
  • the attaching means are formed integrally with the sleeve 12; according to the embodiments of the remaining figures said attaching means comprise separate attaching members, in a position corresponding to the bottom face of each tubular sheath 16 covering the spokes, said means being able to engage with apertures in the bottom side of the spokes and with aligned apertures of the centring tongues or of the spokes.
  • the base 10 still comprises an internal metal frame comprising the cylindrical ring 11 and radial spokes 15.
  • Reference number 12 still indicates the internal plastic sleeve of the hub. At its upper end the sleeve 12 has an annular flange 12a that fits against the upper surface of the spokes 15, said flange 12a being positioned with its protrusions 12b between the spokes and the edges of the covering tubular sheaths.
  • retaining means in the form of attaching members independent of the sleeve 12, positioned on the lower side of the spokes.
  • Said retaining means comprise, for example, a ring element 23 which fits against the lower edge of the cylindrical ring 11 or of the sleeve 12; on its upper side the ring 23 has two opposing tongue members 24 positioned against the respective sides of the spoke to hold the ring centred.
  • each tongue member 24 extends downwards for a short length, with a tongue portion 24a intended to engage in a corresponding hole 20 in the bottom side 16a of each tubular sheath 16.
  • the ring 23 serves to radially hold the tubular sheaths 16 on the spokes 15 which, in their turn, by resting against the annular flange 12a of the sleeve 12 prevent the flange from slipping out of position.
  • the retaining ring 23 for the tubular sheaths is internally positioned, that is, between the spokes 15 and the internal surface of the sheaths; however, by suitably modifying the centring tongues 24, for example by eliminating the protruding portions 24a, the ring 23 could be positioned outside the covering sheaths with the tongues 24 forced into or attached to the apertures 20 in the sheaths.
  • FIGS 7 and 8 of the drawings show another embodiment; in these figures the same reference numbers are used to indicate similar or equivalent parts as in the preceding figures.
  • the retaining means are in the form of pegs 25 which pass through apertures 20 in the bottom face 16a of each tubular covering sheath 16 and which are pressure fitted into, or attached to, a hole or a corresponding seating 25′ which opens at one end of cylindrical tongues 26 integral with the flange 12a of the conical sleeve.
  • the pegs 25 may be made entirely independently or can form part of the ring 25a as diagrammatically shown in figure 8.
  • the pegs 25 could be forced into, or snap fitted into aligned apertures in the tubular sheaths 16 and in the metal spokes 15.

Landscapes

  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
EP89103487A 1988-03-01 1989-02-28 Fusskreuz für Stühle Withdrawn EP0331104A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2075888U IT213716Z2 (it) 1988-03-01 1988-03-01 Struttura di basamento a raggera per sedie girevoli.
IT2075888U 1988-03-01

Publications (1)

Publication Number Publication Date
EP0331104A1 true EP0331104A1 (de) 1989-09-06

Family

ID=11171636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103487A Withdrawn EP0331104A1 (de) 1988-03-01 1989-02-28 Fusskreuz für Stühle

Country Status (2)

Country Link
EP (1) EP0331104A1 (de)
IT (1) IT213716Z2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659368A1 (de) * 1993-12-21 1995-06-28 Shepherd Products, Inc. Fussstern für einen Stuhl
US6637072B2 (en) * 2000-09-29 2003-10-28 Formway Furniture Limited Castored base for an office chair
DE19859473B4 (de) * 1998-12-22 2005-04-14 Innovation Technik Design Itd Gmbh Geräteständer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084776A (en) * 1976-01-21 1978-04-18 Cook Specialty Company Furniture base and method of making the same
DE3324981A1 (de) * 1982-07-12 1984-01-12 Guy-Raymond Engineering Co.Ltd., Norfolk Auseinandernehmbarer stuhlunterbau
US4534533A (en) * 1983-03-15 1985-08-13 Frank Doerner Cover for chair leg

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084776A (en) * 1976-01-21 1978-04-18 Cook Specialty Company Furniture base and method of making the same
DE3324981A1 (de) * 1982-07-12 1984-01-12 Guy-Raymond Engineering Co.Ltd., Norfolk Auseinandernehmbarer stuhlunterbau
US4534533A (en) * 1983-03-15 1985-08-13 Frank Doerner Cover for chair leg

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659368A1 (de) * 1993-12-21 1995-06-28 Shepherd Products, Inc. Fussstern für einen Stuhl
AU672541B2 (en) * 1993-12-21 1996-10-03 Leggett & Platt Canada Co. (Societe Leggett & Platt Canada) Chair base
RU2116742C1 (ru) * 1993-12-21 1998-08-10 Шеферд Продактс, Инк. Основание стула
DE19859473B4 (de) * 1998-12-22 2005-04-14 Innovation Technik Design Itd Gmbh Geräteständer
US6637072B2 (en) * 2000-09-29 2003-10-28 Formway Furniture Limited Castored base for an office chair

Also Published As

Publication number Publication date
IT8820758V0 (it) 1988-03-01
IT213716Z2 (it) 1990-01-22

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Effective date: 19900307