EP0699041B1 - Foot for a rotatable chair - Google Patents

Foot for a rotatable chair Download PDF

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Publication number
EP0699041B1
EP0699041B1 EP94915153A EP94915153A EP0699041B1 EP 0699041 B1 EP0699041 B1 EP 0699041B1 EP 94915153 A EP94915153 A EP 94915153A EP 94915153 A EP94915153 A EP 94915153A EP 0699041 B1 EP0699041 B1 EP 0699041B1
Authority
EP
European Patent Office
Prior art keywords
foot
chair
center part
center
trumpet
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.)
Expired - Lifetime
Application number
EP94915153A
Other languages
German (de)
French (fr)
Other versions
EP0699041A1 (en
Inventor
Helena Kjellman
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.)
Ortus Oy AB
Original Assignee
Ortus Oy AB
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 Ortus Oy AB filed Critical Ortus Oy AB
Publication of EP0699041A1 publication Critical patent/EP0699041A1/en
Application granted granted Critical
Publication of EP0699041B1 publication Critical patent/EP0699041B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/18—Chairs or stools with rotatable seat
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/18—Chairs or stools with rotatable seat
    • A47C3/185—Chairs or stools with rotatable seat self-returning to the original position

Definitions

  • the present invention relates to a foot for a rotatable chair incorporating a hub for the center rod of the chair seat cushion part, and particularly, a base part with an essentially trumpet-shaped contour suited for upholstering with leather or similar material.
  • the invention is particularly related to a base for a TV chair or similar upholstered furniture.
  • the base either has a full-metal structure, or alternatively, comprises a metal stem with a vertical hub suited to accommodate the center shaft of the chair and two square, horizontal, metal support plates which are centered at the stem and are vertically displaced from each other by a given distance, whereby the stem extends through the centerpoint of said plates.
  • Between said support plates are adapted a number of circular pieces of wood so placed and shaped that they provide the peripheral contour of the trumpet-shaped base of the chair.
  • Above the upper support plate is adapted a bearing piece of slightly resilient material and so contoured as to form the inner part of the trumpet-shaped base.
  • This goal is achieved by a chair foot characterized in that said chair foot comprises a trumpet-shaped center part made from injection-moulded material, an outer rim part suited to accommodate the insertion of said center part in such a manner that the contours of both parts adjoin forming the entire trumpet-shaped contour of the chair foot, and further comprises a circular bottom plate to which said parts of the foot are fixed.
  • the chair foot according to the invention includes a hub 1 for the center rod 2 of a rotatable chair, said chair foot having an essentially trumpet-shaped contour suited for upholstering with leather or similar upholstering material.
  • the characterizing property of the chair foot according to the invention is that said chair foot comprises a trumpet-shaped center part 3 fabricated from injection-moulded material, an outer rim part 4 adapted to accommodate the insertion of said center part 3 in such a manner that the contours of both parts 3, 4 adjoin forming the entire trumpet-shaped contour of the chair foot, and further comprises a circular bottom plate 5 to which said parts 3 and 4 of the foot are fixed.
  • the center part 3 By manufacturing the center part 3 from an injection-moulded material, advantageously a composite material such as a glass-fiber-reinforced thermoplastic of extremely high strength, the center part 3 can be advantageously provided with a center cavity suited act as a pivot hub 1 for the center rod 2 of the chair seat cushion part.
  • Suitable thermoplastic for the center part is polypropylene, polyamide or polycarbonate.
  • Sufficient stability is attained by using a number of vertical and radial stiffening ribs 6 which join the outer wall of the chair hub 1 to the inner side of the contoured envelope of the center part 3.
  • the center part 3 can be alternatively made from injection-moulded aluminium or zinc.
  • the rim part 4 which will not be subjected to as high mechanical stresses as the center part 3 can be advantageously injection-moulded from a less costly material such as conventional polypropylene or similar thermoplastic polymer.
  • the base plate 5 can be advantageously made from plywood or similar wood material which makes it possible to fix the lower edge of the upholstering material to the underside of the base plate 5.
  • the base plate 5 and the rim part 4 may be fabricated as a single piece from, e.g., wood, whereby only the contour of the center part 3 will be upholstered with leather or similar material.
  • the upper part of the inner mating surface 7 may be provided with a rabbet 8 running along the entire inner rim of the rim part 4, said rabbet having a diameter compatible with the outer diameter of the center part 3 and its horizontal dimension being compatible with the height of the outer rim of the center part 3.
  • the same center part 3 can be used in conjunction with rim parts 4 of different height and contour of their contour envelope (cf. Fig. 1 and Fig 4).
  • the chair foot can be advantageously provided with a spacing element 15 placed in the space remaining between the stiffening ribs 6 of the center part and the base plate 5.
  • a suitable method of connecting the different elements of the chair foot to each other is by means of screws, e.g., by designing each stiffening rib 6 closest to the perimeter of the center part 3 with a thicker area in which a screw hole 9 is provided.
  • the rim part 4 will be fixed to the base plate 5 when the base plate 5 is fixed by screws to the center part 3.
  • a suitable number of the stiffening ribs 6, and consequently, the screw holes 9 is five or six as illustrated in Fig. 3.
  • the central cavity of the center part 3 is formed into a chair hub 1 suited to accommodate the conventional chair seat cushion part center rod 2, whereby the cavity has a diameter compatible with the diameter of the center rod 2.
  • the center rod 2 may be of the type equipped with a return mechanism such as that illustrated in the drawing, whereby a slightly larger cylindrical cavity must be provided in the center part 3 so that an spring-loaded, axially movable sliding element 10 placed about the center rod 2 can be adapted to the interior of the chair hub 1, said sliding element 10 having at its lower end a spiral cam surface 11 adapted to cooperate with a follower roll 12 mounted on the center rod 2, thus forming a return mechanism of the type described in, e.g., the FI patent publication 83,590.
  • the lower part of the chair hub 1 is provided with a bearing seat compatible with the lower end of the center rod 4, said bearing seat acting as a sliding bearing for the center rod 4, while the upper part of the chair hub 1 is provided with a ball bearing 13.
  • the top of the center part 3 is provided with a collar 14 adapted about the chair hub 1, said collar having a contour which acts as a continuation of the trumpet-shaped contour of the chair base proper.
  • This collar principally serves for three functions, one of which is to mask the point where the chair seat cushion part adjoins the chair base, while the collar on the other hand also facilitates an effective and simple fixing of a shape-sewn leather upholstery tensioned over the chair base. This fixing takes place by folding the upper rim of the leather upholstery over the collar 14 into a cavity formed into the collar 14, after which an annular compression spring is inserted to tension the rim of the leather upholstery against the inner wall of the collar 14.

Abstract

The present invention is related to a foot for a rotatable chair incorporating a hub (1) for the chair center rod (2), and a base part with an essentially trumpet-shaped contour suited for upholstering with leather or similar material. The chair foot is characterized in that the foot comprises a trumpet-shaped center part (3) made from injection-moulded material, an outer rim part (4) suited to accommodate the insertion of said center part (3) in such a manner that the contours of both parts (3, 4) adjoin forming the entire trumpet-shaped contour of the chair foot, and further comprises a circular bottom plate (5) to which said parts (3, 4) of the foot are fixed.

Description

The present invention relates to a foot for a rotatable chair incorporating a hub for the center rod of the chair seat cushion part, and particularly, a base part with an essentially trumpet-shaped contour suited for upholstering with leather or similar material. The invention is particularly related to a base for a TV chair or similar upholstered furniture.
In prior-art foot constructions of cited type of chairs, the base either has a full-metal structure, or alternatively, comprises a metal stem with a vertical hub suited to accommodate the center shaft of the chair and two square, horizontal, metal support plates which are centered at the stem and are vertically displaced from each other by a given distance, whereby the stem extends through the centerpoint of said plates. Between said support plates are adapted a number of circular pieces of wood so placed and shaped that they provide the peripheral contour of the trumpet-shaped base of the chair. Above the upper support plate is adapted a bearing piece of slightly resilient material and so contoured as to form the inner part of the trumpet-shaped base. Manufacture of such a chair base is extremely complicated and labour-intensive resulting in relatively high production costs.
It is an object of present invention to overcome the above-described problems and to provide a stable and durable chair foot with a desired trumpet-shape whose production is quick and simple at a reasonable price. This goal is achieved by a chair foot characterized in that said chair foot comprises a trumpet-shaped center part made from injection-moulded material, an outer rim part suited to accommodate the insertion of said center part in such a manner that the contours of both parts adjoin forming the entire trumpet-shaped contour of the chair foot, and further comprises a circular bottom plate to which said parts of the foot are fixed.
Other characterizing properties of the invention are disclosed in the annexed claims 1 - 9.
The invention is next examined in greater detail with reference to the appended drawings, in which:
Figure 1
is a sectional side view of an exemplifying embodiment of the chair foot according to the invention;
Figure 2
is a top view of the chair foot shown in Fig. 1;
Figure 3
is a bottom view of the chair foot shown in Fig. 1;
Figure 4
is a sectional view of a second embodiment of the chair foot according to the invention; and
Figure 5
is a sectional view of a third embodiment of the chair foot according to the invention.
The chair foot according to the invention includes a hub 1 for the center rod 2 of a rotatable chair, said chair foot having an essentially trumpet-shaped contour suited for upholstering with leather or similar upholstering material. The characterizing property of the chair foot according to the invention is that said chair foot comprises a trumpet-shaped center part 3 fabricated from injection-moulded material, an outer rim part 4 adapted to accommodate the insertion of said center part 3 in such a manner that the contours of both parts 3, 4 adjoin forming the entire trumpet-shaped contour of the chair foot, and further comprises a circular bottom plate 5 to which said parts 3 and 4 of the foot are fixed.
By manufacturing the center part 3 from an injection-moulded material, advantageously a composite material such as a glass-fiber-reinforced thermoplastic of extremely high strength, the center part 3 can be advantageously provided with a center cavity suited act as a pivot hub 1 for the center rod 2 of the chair seat cushion part. Suitable thermoplastic for the center part is polypropylene, polyamide or polycarbonate. Sufficient stability is attained by using a number of vertical and radial stiffening ribs 6 which join the outer wall of the chair hub 1 to the inner side of the contoured envelope of the center part 3. In certain cases the center part 3 can be alternatively made from injection-moulded aluminium or zinc. The rim part 4 which will not be subjected to as high mechanical stresses as the center part 3 can be advantageously injection-moulded from a less costly material such as conventional polypropylene or similar thermoplastic polymer. The base plate 5 can be advantageously made from plywood or similar wood material which makes it possible to fix the lower edge of the upholstering material to the underside of the base plate 5. When desired, the base plate 5 and the rim part 4 may be fabricated as a single piece from, e.g., wood, whereby only the contour of the center part 3 will be upholstered with leather or similar material.
To attain the best possible mating between the center part 3 and the rim part 4, the upper part of the inner mating surface 7 may be provided with a rabbet 8 running along the entire inner rim of the rim part 4, said rabbet having a diameter compatible with the outer diameter of the center part 3 and its horizontal dimension being compatible with the height of the outer rim of the center part 3. By virtue of such a construction, the same center part 3 can be used in conjunction with rim parts 4 of different height and contour of their contour envelope (cf. Fig. 1 and Fig 4). To attain the best possible stability, the chair foot can be advantageously provided with a spacing element 15 placed in the space remaining between the stiffening ribs 6 of the center part and the base plate 5.
A suitable method of connecting the different elements of the chair foot to each other is by means of screws, e.g., by designing each stiffening rib 6 closest to the perimeter of the center part 3 with a thicker area in which a screw hole 9 is provided. By virtue of the rabbet 8 of the rim part 4, the rim part 4 will be fixed to the base plate 5 when the base plate 5 is fixed by screws to the center part 3. A suitable number of the stiffening ribs 6, and consequently, the screw holes 9 is five or six as illustrated in Fig. 3.
In the simplest embodiment, the central cavity of the center part 3 is formed into a chair hub 1 suited to accommodate the conventional chair seat cushion part center rod 2, whereby the cavity has a diameter compatible with the diameter of the center rod 2.
In a more advanced embodiment, the center rod 2 may be of the type equipped with a return mechanism such as that illustrated in the drawing, whereby a slightly larger cylindrical cavity must be provided in the center part 3 so that an spring-loaded, axially movable sliding element 10 placed about the center rod 2 can be adapted to the interior of the chair hub 1, said sliding element 10 having at its lower end a spiral cam surface 11 adapted to cooperate with a follower roll 12 mounted on the center rod 2, thus forming a return mechanism of the type described in, e.g., the FI patent publication 83,590. To achieve a reliable and durable construction, the lower part of the chair hub 1 is provided with a bearing seat compatible with the lower end of the center rod 4, said bearing seat acting as a sliding bearing for the center rod 4, while the upper part of the chair hub 1 is provided with a ball bearing 13.
According to a preferred embodiment, the top of the center part 3 is provided with a collar 14 adapted about the chair hub 1, said collar having a contour which acts as a continuation of the trumpet-shaped contour of the chair base proper. This collar principally serves for three functions, one of which is to mask the point where the chair seat cushion part adjoins the chair base, while the collar on the other hand also facilitates an effective and simple fixing of a shape-sewn leather upholstery tensioned over the chair base. This fixing takes place by folding the upper rim of the leather upholstery over the collar 14 into a cavity formed into the collar 14, after which an annular compression spring is inserted to tension the rim of the leather upholstery against the inner wall of the collar 14.

Claims (9)

  1. A foot for a rotatable chair incorporating a hub (1) for the chair center rod (2), and particularly, a base part with an essentially trumpet-shaped contour suited for upholstering with leather or similar material, characterized in that the foot comprises a trumpet-shaped center part (3) made from injection-moulded material, an outer rim part (4) suited to accommodate the insertion of said center part (3) in such a manner that the contours of both parts (3, 4) adjoin forming the entire trumpet-shaped contour of the chair foot, and further comprises a circular bottom plate (5) to which said parts (3, 4) of the foot are fixed.
  2. A foot for a rotatable chair as defined in claim 1, characterized in that the inner mating surface (7) of the rim part (4) is provided with a rabbet (8) running along the entire inner rim of the rim part (4), said rabbet having a diameter compatible with the outer diameter of the center part (3) and its horizontal dimension being compatible with the height of the outer rim of the center part (3).
  3. A foot for a rotatable chair as defined in claim 2, characterized in that the three major elements (3, 4, 5) of the chair foot are fixed together by means of screws (9) connecting the base plate (5) to the center part (3).
  4. A foot for a rotatable chair as defined in claim 3, characterized in that the center part (3) is designed to act as a hub (1) for a conventional center rod (2) of the chair seat cushion part.
  5. A foot for a rotatable chair as defined in claim 3, characterized in that the center part (3) is designed to act as a hub (1) for a return-spring-loaded center rod (2) of the chair seat cushion part.
  6. A foot for a rotatable chair as defined in any foregoing claim, characterized in that the top of the center part (3) is provided with a collar (14) adapted about the chair hub (1), said collar having a contour which acts as a continuation of the trumpet-shaped contour of the chair foot proper.
  7. A foot for a rotatable chair as defined in any foregoing claim, characterized in that the center part (3) is manufactured from a composite material comprising a glass-fiber-reinforced thermoplastic such as polypropylene, polyamide or polycarbonate.
  8. A foot for a rotatable chair as defined in any of foregoing claims 1 - 6, characterized in that the center part (3) is manufactured from aluminium or zinc.
  9. A foot for a rotatable chair as defined in claim 6, characterized in that a shape-sewn leather upholstery tensioned over the chair foot is fixed at the top of the chair foot by means of an annular compression spring which is placed into a cavity designed to the interior of said collar (14) so as to compress the upper rim of the leather upholstery folded over the collar (14) and the upholstery is fixed at its lower rim by stapling to the underside of the base plate (5).
EP94915153A 1993-05-19 1994-05-06 Foot for a rotatable chair Expired - Lifetime EP0699041B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI932307 1993-05-19
FI932307A FI92282C (en) 1993-05-19 1993-05-19 Swivel chair foot
PCT/FI1994/000177 WO1994026150A1 (en) 1993-05-19 1994-05-06 Foot for a rotatable chair

Publications (2)

Publication Number Publication Date
EP0699041A1 EP0699041A1 (en) 1996-03-06
EP0699041B1 true EP0699041B1 (en) 1998-08-05

Family

ID=8537972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94915153A Expired - Lifetime EP0699041B1 (en) 1993-05-19 1994-05-06 Foot for a rotatable chair

Country Status (5)

Country Link
EP (1) EP0699041B1 (en)
AT (1) ATE169190T1 (en)
DE (1) DE69412256D1 (en)
FI (1) FI92282C (en)
WO (1) WO1994026150A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD20080202A1 (en) * 2008-09-26 2010-03-27 Tonon & C Spa AUTO ALIGNMENT DEVICE FOR A FURNITURE ELEMENT

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI83590C (en) * 1989-05-10 1991-08-12 F Ma Mekrapid Hub construction for a rotatable chair

Also Published As

Publication number Publication date
WO1994026150A1 (en) 1994-11-24
ATE169190T1 (en) 1998-08-15
FI92282C (en) 1994-10-25
FI92282B (en) 1994-07-15
EP0699041A1 (en) 1996-03-06
DE69412256D1 (en) 1998-09-10
FI932307A0 (en) 1993-05-19

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