EP0357578B1 - Fussgestell und Säule für einen Bürostuhl - Google Patents

Fussgestell und Säule für einen Bürostuhl Download PDF

Info

Publication number
EP0357578B1
EP0357578B1 EP89850272A EP89850272A EP0357578B1 EP 0357578 B1 EP0357578 B1 EP 0357578B1 EP 89850272 A EP89850272 A EP 89850272A EP 89850272 A EP89850272 A EP 89850272A EP 0357578 B1 EP0357578 B1 EP 0357578B1
Authority
EP
European Patent Office
Prior art keywords
socket
hub
post tube
post
base
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
EP89850272A
Other languages
English (en)
French (fr)
Other versions
EP0357578A1 (de
Inventor
Mark J. Bonnema
David J. Morrison
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.)
Shaw Walker Co
Original Assignee
Shaw Walker Co
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 Shaw Walker Co filed Critical Shaw Walker Co
Priority to AT89850272T priority Critical patent/ATE68079T1/de
Publication of EP0357578A1 publication Critical patent/EP0357578A1/de
Application granted granted Critical
Publication of EP0357578B1 publication Critical patent/EP0357578B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • A47C5/00—Chairs of special materials
    • A47C5/12—Chairs of special materials of plastics, with or without reinforcement

Definitions

  • the invention is directed to a chair base and post assembly for an office chair in which the chair base is formed in one piece of injection molded plastic.
  • An object of this invention is a chair base and post assembly in which a steel post is mounted in a plastic hub and is supported so as to transfer its load vertically onto the hub with the hub also stabilizing the post tube against tilting.
  • Another object of this invention is a plastic chair base having a hub with a socket that permits easy removal of the molding tools yet provides non-tapered annular bearing surfaces to stabilize a steel post tube which is positioned in the socket.
  • Another object of this invention is a plastic chair base having a hub with a socket in which the hub itself provides a lower annular bearing surface to stabilize a steel post tube positioned in the socket and a steel sleeve near the upper end of the socket provides another annular bearing surface to stabilize the post tube.
  • Fig. 1 of the drawings is a cross-sectional view showing a chair base and post assembly 11 embodying the novel features of this invention.
  • the chair base and post assembly includes a hub 13 with five integral arms 15 which are formed in one piece by injection molding of plastic.
  • the arms are molded of thin walled, somewhat parabolic cross-section with honeycombed reinforcing ribs and ejection pin tubes 16, as shown in Figs. 1 and 3 of the drawings.
  • Any suitable high strength plastic may be used to injection mold the integral base and arms.
  • a plastic found to be suitable is nylon resin plastic sold by E.I. du Pont de Nemours & Co. under the designation "Zytel 72G33 nylon resin.”
  • a socket 17 formed in the hub 13 extends therethrough from top to bottom.
  • a steel post tube 19 is mounted in the socket and projects upwardly above the socket.
  • a pneumatic lift cylinder 21 telescopes inside and projects upwardly beyond the top of the steel post tube.
  • a plastic guide bushing 23 seats in the upper end of the steel post tube to guide and stabilize the pneumatic lift cylinder.
  • a collar 25 which is formed integrally with the plastic guide bushing rests on the upper end of the steel post 19.
  • Ribs 27 spaced around the outer periphery of the plastic guide bushing below the collar 25 engage the inside surface of the steel post tube 19 to prevent the plastic guide bushing from rotating inside the steel post tube.
  • the ribs 27 are notched partially at 29 just below the collar 25.
  • a scalloped steel washer 31 is welded at 32 to the outside of the steel post tube 19.
  • five cutouts 33 are formed in the washer, with each cutout being positioned between a pair of converging arms 15 extending from the hub 13 of the chair base, as can be best seen in Fig. 3 of the drawings.
  • the scalloped washer fits into a corresponding scalloped notch 35 formed in the top of the hub 13 and rests on a shoulder 37 defining the bottom of the notch to thereby transfer the weight of the post tube 19 vertically onto the hub 13.
  • the remainder of the socket 17 below the scalloped notch 35 is of irregular cross-section and includes a slightly tapered cylindrical portion or counterbore 39 located below the shoulder 37.
  • the taper which provides draft for removal of the molding tool from the cylindrical portion 39 need only be approximately 0.5 degrees.
  • a shoulder 41 defines the lower portion of the slightly tapered cylindrical portion 39.
  • a convergently tapered portion 43 extends downwardly from the shoulder 41 and a cylindrical portion 45 without any taper is formed at the lower end of the socket 17.
  • the cylindrical portion 45 provides an annular wall which engages the outer wall of the steel post tube 19 to stabilize the post tube against lateral moving or tilting.
  • a steel sleeve 47 having a cylindrical inner wall 49 which engages the cylindrical outer wall of the steel post tube 19, is positioned in the cylindrical portion 39 and rests on the shoulder 41.
  • the outer wall 51 of the steel sleeve 47 has a taper corresponding to the taper of the cylindrical portion 39 so that the sleeve 47 is fully contacting the slightly tapered cylindrical portion 39 of the hub.
  • the outer surface of the wall of the steel post tube 19 does not engage the socket wall in the space between the steel sleeve 47 and the lower cylindrical portion 45 of the hub.
  • a cylindrical washer 55 is welded to the steel post tube just inside the lower end of the tube.
  • the cylindrical washer has an opening 57 in the center thereof.
  • a steel hat washer 59 having a center opening 61 which aligns with and is the same diameter as the center opening 57 of the cylindrical washer 55 is force fitted into an annular notch 63 formed at the lower end of the hub and engages the cylindrical washer 55.
  • the pneumatic lift cylinder 21 has a piston rod 67 extending out of the bottom and a plastic actuating button 68 at the top thereof.
  • the rod has an end portion 69 of reduced diameter providing a downwardly facing annular shoulder 71.
  • the shoulder 71 rests on a ball bearing assembly 73 which is supported on the cylindrical washer 55 welded to the post tube 19 near the bottom thereof.
  • the reduced diameter end portion 69 of the piston rod extends through the openings 57 and 61 in the washers 55 and 59, respectively, and projects out of the bottom of the post tube 19.
  • a clip 75 fits into a notch 77 formed in the end portion 69 of the piston rod 67 and secures it against upward movement.
  • a resilient rubber washer 79 is positioned between the bottom of the lift cylinder and the ball bearing assembly.
  • the upper end of the pneumatic lift cylinder 21 is tapered to fit into a socket located on the underside of a chair seat, but which is not shown.
  • Caster sockets 81 are formed in the ends of the arms 15 to receive conventional chair casters which are not shown.

Landscapes

  • Chairs Characterized By Structure (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Hydrogenated Pyridines (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Claims (3)

1. Fußgestell (11) für einen Bürostuhl mit einer mittleren Nabe (13) zur Aufnahme eines Säulenrohrs (19) und radial von der Nabe ausgehenden Gestellarmen (15), gekennzeichnet durch
eine sich vertikal durch die Nabe erstreckende Buchse (17),
wobei die Buchse einen ungleichmäßigen Querschnitt aufweist, der im Durchmesser von oben nach unten kleiner wird,
eine nicht-konische Ringwand (45) nahe dem unteren Ende der Buchse (17) für einen Eingriff mit einem in die Buchse einzusetzenden Säulenrohr (19), um das Säulenrohr gegen eine seitliche Bewegung zu stabilisieren,
eine leicht konische erweiterte Senkbohrung (43) am oberen Ende der Buchse zur Aufnahme einer Hülse (47) für einen Eingriff mit dem Säulenrohr zu dessen Stabilisierung, und daß
der Bereich der Buchse zwischen der Senkbohrung und der nicht-konischen Ringwand derart konisch verläuft, daß er außer Berührung mit dem in die Buchse eingesetzten Säulenrohr ist.
2. Stuhlfußgestell- und Säulenanordnung (11) für einen Bürostuhl nach Anspruch 1, dadurch gekennzeichnet, daß
das Fußgestell einstückig aus Kunststoff geformt ist,
die Buchse (17) einen ungleichmäßigen Querschnitt besitzt,
das Säulenrohr (19) zylindrisch ausgebildet und in der Buchse angeordnet sowie sich aus der Buchse über die Nabe hinauserstreckt,
eine Einrichtung (31) an der Außenseite des Säulenrohrs (19) angebracht ist und auf der Nabe (13) zur Abstützung des Säulenrohrs (19) aufliegt,
ringförmige Ennenflächen (39, 45) in der Buchse (17) nahe deren oberem und unterem Ende für einen Eingriff mit dem Säulenrohr zu dessen Stabilisierung gegen eine seitliche Bewegung angeordnet sind,
die in der Buchse nahe deren unterem Ende angeordnete ringförmige Innenfläche als eine nicht-konische Innenwand (45) der Nabe und die in der Buchse nahe deren oberem Ende angeordnete Innenfläche als die Innenwand einer in die Senkbohrung (39) in der Buchse nahe deren oberem Ende eingesetzten Hülse (47) ausgebildet ist, und
eine Einrichtung (55, 59) am unteren Ende des Säulenrohrs (19) zur Abstützung eines in dem Säulenrohr angeordneten pneumatischen Hubzylinders (21) angeordnet ist.
3. Stuhlfußgestell- und Säulenanordnung nach Anspruch 2, dadurch gekennzeichnet, daß ein Bereich (43) der Buchse (17) zwischen den ringförmigen Innenflächen konisch ist und nicht mit der zylindrischen Säulenhülse in Berührung steht.
EP89850272A 1988-09-01 1989-08-25 Fussgestell und Säule für einen Bürostuhl Expired - Lifetime EP0357578B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89850272T ATE68079T1 (de) 1988-09-01 1989-08-25 Fussgestell und saeule fuer einen buerostuhl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23946288A 1988-09-01 1988-09-01
US239462 1988-09-01

Publications (2)

Publication Number Publication Date
EP0357578A1 EP0357578A1 (de) 1990-03-07
EP0357578B1 true EP0357578B1 (de) 1991-10-09

Family

ID=22902239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89850272A Expired - Lifetime EP0357578B1 (de) 1988-09-01 1989-08-25 Fussgestell und Säule für einen Bürostuhl

Country Status (4)

Country Link
EP (1) EP0357578B1 (de)
JP (1) JPH02114912A (de)
AT (1) ATE68079T1 (de)
DE (1) DE68900316D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415056A1 (de) * 1994-04-29 1995-11-02 Link Wilhelm Kg Stuhl, insbesondere Arbeitsstuhl
US5454536A (en) * 1994-01-13 1995-10-03 Westinghouse Electric Corporation Chair base assembly
AU729048B2 (en) * 1996-11-05 2001-01-25 Dynafurn A Division Of Lincoln Sentry Group Pty Ltd Chair base
MX2021012174A (es) * 2019-04-04 2021-12-10 Medway Plastics Corp Aparatos y metodos para la estructura inferior de una base de silla.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1893258U (de) * 1964-02-12 1964-05-21 Kemman & Koch Fussteil fuer sitzmoebel.
DE1296760B (de) * 1966-02-08 1969-06-04 Roeder Soehne Vorm Haberle & C Hoehenverstellbare Saeule, insbesondere Drehstuhlsaeule
SE418144B (sv) * 1978-05-31 1981-05-11 Kinnarps Kontorsmobler Ab Anordning vid en stol med en sa kallad stolspindel

Also Published As

Publication number Publication date
EP0357578A1 (de) 1990-03-07
DE68900316D1 (de) 1991-11-14
ATE68079T1 (de) 1991-10-15
JPH02114912A (ja) 1990-04-27

Similar Documents

Publication Publication Date Title
US5149035A (en) Chair base and post assembly for an office chair
US3790119A (en) Energy storing device, particularly a blockable pneumatic spring
US5497972A (en) Stand for artificial Christmas tree or the like
US3099244A (en) Road markers
US4591126A (en) Base for supporting an upright post of a garden umbrella or the like
US6138973A (en) Adjustable seat pedestal
US4979718A (en) Lockable elevating mechanism for the continuous adjustment of seats, table tops or similar items of furniture
JPH0531968Y2 (de)
US5199131A (en) Thermoplastic caster assembly
US20020163238A1 (en) Methods and apparatus for electrically adjusting a height of a chair
US5042764A (en) Self-leveling furniture glide
EP0357578B1 (de) Fussgestell und Säule für einen Bürostuhl
EP0512434A1 (de) Längenverstellbare Stützsäule mit Standrohr aus Kunststoff
US5711335A (en) Medical walker foot with collapsible tip
EP0268145B1 (de) Lenkrolle
JPH07148049A (ja) 椅子、机等用の長手方向に調整可能な支柱
JPH0132905Y2 (de)
US5287595A (en) Furniture glide and pintle
US5749557A (en) Height adjusting device for a chair
US20050082443A1 (en) Height adjustable boat seat pedestal
US3727871A (en) Seat-height adjustment device
US2859979A (en) Bearings for fork stems
US5454536A (en) Chair base assembly
US5984567A (en) Molded split sleeve bushing for chair base
US4744538A (en) Decorative cap and base cover for an office chair center post and base

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19891227

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17Q First examination report despatched

Effective date: 19910227

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19911009

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19911009

Ref country code: LI

Effective date: 19911009

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19911009

Ref country code: FR

Effective date: 19911009

Ref country code: SE

Effective date: 19911009

Ref country code: AT

Effective date: 19911009

Ref country code: NL

Effective date: 19911009

Ref country code: CH

Effective date: 19911009

Ref country code: BE

Effective date: 19911009

REF Corresponds to:

Ref document number: 68079

Country of ref document: AT

Date of ref document: 19911015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 68900316

Country of ref document: DE

Date of ref document: 19911114

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EN Fr: translation not filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920831

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930501

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930825

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930825