US3669399A - Mechanism for the tiltable seat of a chair - Google Patents

Mechanism for the tiltable seat of a chair Download PDF

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Publication number
US3669399A
US3669399A US77998A US3669399DA US3669399A US 3669399 A US3669399 A US 3669399A US 77998 A US77998 A US 77998A US 3669399D A US3669399D A US 3669399DA US 3669399 A US3669399 A US 3669399A
Authority
US
United States
Prior art keywords
tube
support member
chair
seat
torsion bar
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
US77998A
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English (en)
Inventor
John Stewart Wager
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.)
Bostrom Seating Inc
Universal Oil Products Co
Original Assignee
Universal Oil Products 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 Universal Oil Products Co filed Critical Universal Oil Products Co
Application granted granted Critical
Publication of US3669399A publication Critical patent/US3669399A/en
Assigned to FIRST NATIONAL BANK OF CHICAGO reassignment FIRST NATIONAL BANK OF CHICAGO SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOSTROM ACQUISITION CORPORATION, A CORP OF DE
Assigned to BOSTROM SEATING CORPORATION reassignment BOSTROM SEATING CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: 05/21/85 Assignors: BOSTROM ACQUISITION CORPORATION
Assigned to BOSTROM ACQUISITION CORPORATION reassignment BOSTROM ACQUISITION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UOP INC., A DE. CORP.
Assigned to DNC AMERICA BANKING CORPORATION reassignment DNC AMERICA BANKING CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOSTROM SEATING, INC.
Anticipated expiration legal-status Critical
Assigned to FIRST NATIONAL BANK OF CHICAGO, THE reassignment FIRST NATIONAL BANK OF CHICAGO, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOSTROM SEATING, INC.
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
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • 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
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/441—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with adjustable elasticity
    • 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
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs
    • 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
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs
    • A47C7/4454—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs of torsion type

Definitions

  • a pivot mechanism f a chair seat in which a torsion bar is fastened at its ends within' a tube and to the underside of a [52] US. Cl ..248/373 seat
  • a upport member fastens the tube for relative rotation 1111- C1 "A476 3/023 about its own axis to a seat base.
  • the tube has a transverse [58] Field f S ar h 1 opening therein through which an arm rigidly attached to said 7/ 267/ 1 57 torsion bar extends. The arm is positionable with respect to an abutment on the support member by means of a manually operable torque varying mechanism.
  • This invention relates to a pivot mechanism for the tiltable seat of a chair or like seating device.
  • a pivot mechanism for the tiltable seat of a chair, comprising a tube through which a torsion bar extends, the ends of the bar being rigidly secured to the adjacent ends of the tube, means for rigidly securing the tube to the underside of the seat of a chair, a support member in whichthe central portion of the tube is journaled for rotation about the axis of the tube, the support member having coupling means for mounting the member on the base of a chair, the tube having an opening in said central portion, an arm rigidly secured to the torsion bar extending outwards through said opening, and a manually operable mechanism for moving the outer end of the arm relative to the support member to vary the torque in the bar.
  • the present invention also provides a pivot mechanism for the tiltable seat of a chair, comprising parallel-spaced elongate members for attachment to the seat, a tube extending between and rigidly secured to said elongate members, a torsion bar disposed within the tube and rigidly secured at its ends to the tube or elongate members, a support member disposed adjacent the central portion of the tube and having spaced bearings in which the tube is journaled, and coupling means for securing the support member to a base of the chair, said tube being open between said bearings, and an arm rigidly secured to the torsion bar and extending away from the bar through the opening, the outer end of the arm being movable, relative to an abutment on the support member, by means of a manually operable torque-varying mechanism.
  • FIG. 1 is a section in a horizontal plane through a pivot mechanism
  • FIG. 2 is a section on the line 2-2 of FIG. 1, shown in elevation;
  • FIG. 3 is a section on the line 3-3 of FIG. 1.
  • the chair to which the pivot mechanism of the present invention is applicable will normally comprise a seat part having a rigid panel on the upper face of which a seat cushion is mounted, and a base part in the form of a floor support and a pedestal or column upstanding from the floor support on which the rigid panel of the seat part is mounted through the pivot mechanism.
  • the pivot mechanism as shown in the drawings, comprises a horizontal pivot tube 10 rigidly connected at its opposite ends to elongate angle members 11 which are parallel to each other and perpendicular to the torsion bar 17. These angle members are screwed to the underside of the seat panel.
  • the tube At the mid-length position of the tube, the tube extends through a central support member 12 in the form of a casting which has a pair of apertured bosses spaced apart and forming bearings 13 for the tube.
  • the casting extends laterally of the tube in the form of an abutment plate 14 which, in the normal position of the seat, rests against the underside of the seat panel.
  • the casting also extends laterally of the tube, on the side thereof opposite to the plate, in the form of a coupling arm 15 which is spaced from the underside of the seat panel and includes a vertically-extending thick walled sleeve 16 of which the inner surface tapers slightly in the upward direction and is designed for the reception therein of the tapered upper end of a vertical seat column.
  • the rectangular-section torsion bar 17 which at its opposite ends is rigidly connected to the tube and to the seat mounting angle members 11 by locking members each in the form of an end cap or plug 18 having a central opening for reception of the end of the torsion bar and a series of peripheral projections (not shown) for engagement in corresponding recesses in the seat mounting angle members.
  • the pivot tube 10 has part of its wall cut away between the two bearings of the central casting to provide an opening 19 which exposes the torsion bar extending through the tube, and this portion of the torsion bar is rigidly connected to a torquebearing arm 20 which extends outwardly through the opening of the tube.
  • the peripheral extent of the opening is sufiicient to allow angular movement of the torque-bearing arm relative to the tube equal to the maximum tilting movement of the seat.
  • the arm 20 has a transversely-extending screw-threaded hole 21 near its outer end in which engages a torque-varying screw 22, and one end of the screw bears against the plate 14 of the central casting whereas the other end supports a handle 23.
  • a sheet metal stop bracket 24 is welded to the pivot tube 10 at positions equidistant from its center and is located between the seat panel and the coupling 15 to limit the backward tilting movement of the seat. Moreover the bracket is bent around, at its center to engage under the coupling 15 and overcome the danger of the seat occupant inserting part of his hand between relatively pivoting parts of the mechanism.
  • the backward tilting movement of the seat resulting from backward movementiof the seat occupant, causes the seat mounting angle members 11 and the tube 10 welded therebetween to pivot rearwardly, and thus the outerends of the torsion bar are rotated in the same direction.
  • the central portion of the torsion bar however is secured to the torque-bearing arm 20 which, through the torque-varying screw 22, presses on the abutment plate which forms part of the support member 12, and hence part of the base of the seat.
  • the center of the torsion bar is held against pivotal movement in a vertical plane relative to the seat column and, as the tilting movement of the seat increases, so the biasing return force, or torque, in the torsion bar increasingly opposes further backward tilting movement.
  • a limit stop is formed by the stop bracket 24 which is engaged in the backward tilting direction by the upper side of the coupling 15, whereas forward tilting movement is limited by engagement of the plate 14 of the central casting against the underside of the seat panel.
  • the force of the return spring formed by the tension bar can be varied by rotation of the torque-varying screw 22.
  • the central casting is positioned on the pivot tube and the stop bracket is located on the tube and welded in position.
  • Bearing bushes are fitted on the tube and pressed into the bosses of the casting.
  • the torque-varying arm is positioned in the opening of the pivot tube, and the screw handle 23 is fitted to the outer end of the torque-bearing arm.
  • the torsion bar is fed through the pivot tube and torque-bearing arm, and the seat mounting angle members and end caps are fitted on to the torsion bar and angle members.
  • the torsion bar is pre-loaded by rotating the seat mounting angle members and end caps relative to the pivot tube to a predetermined position, and then the angle members and end caps are welded to the pivot tube.
  • the torsion bar can comprise either a single element of rectangular or other non-circular section or two or more coextensive elements of any desired section.
  • a pivot mechanism for the tiltable seat of a chair, comprising a torsion bar, a tube through which said torsion bar extends, the ends of the bar being rigidly secured to the adjacent ends of the tube, means for rigidly securing the tube to the underside of the seat of a chair, a support member in which the central portion of the tube is journaled for rotation about the axis of the tube, the support member having coupling means for mounting the support member on the base of a chair, the
  • ' member has bearings for the tube disposed on opposite sides of said opening in the tube.
  • a pivot mechanism according to claim 2 having a stop member rigidly secured to the tube for engagement with the support member to limit the pivotal movement of the seat relative to the base of the chair in one direction.
  • a pivot mechanism for the tiltable seat of a chair comprising parallel-spaced elongate members for attachment to the seat, a tube extending between andrigidly secured to said elongate members, a torsion bar disposed within the tube and rigidly secured at its ends to the tube and elongate members, a support member disposed adjacent the central portion of the tube and having spaced bearings in whichthe tube is journaled, and coupling means'for securing the support member to a base of the chair, said tube being open between said bearings, and an arm rigidly secured to the torsion bar and extending away from the bar through the opening, the outer end of the arm being movable, relative to an abutment on the support member, by means of a manually operable torque-varying mechanism.
  • a pivot mechanism according to claim 5 wherein the support member is a casting in which said sleeve, bosses forming said bearings, and said abutment are integrally formed.

Landscapes

  • Chairs Characterized By Structure (AREA)
  • Pivots And Pivotal Connections (AREA)
US77998A 1969-10-04 1970-10-05 Mechanism for the tiltable seat of a chair Expired - Lifetime US3669399A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4886569 1969-10-04

Publications (1)

Publication Number Publication Date
US3669399A true US3669399A (en) 1972-06-13

Family

ID=10450217

Family Applications (1)

Application Number Title Priority Date Filing Date
US77998A Expired - Lifetime US3669399A (en) 1969-10-04 1970-10-05 Mechanism for the tiltable seat of a chair

Country Status (10)

Country Link
US (1) US3669399A (ro)
AT (1) AT299483B (ro)
AU (1) AU2066670A (ro)
BE (1) BE756993A (ro)
CH (1) CH523045A (ro)
DE (1) DE2048460A1 (ro)
FR (1) FR2064978A5 (ro)
RO (1) RO59827A (ro)
SE (1) SE7013323L (ro)
ZA (1) ZA706574B (ro)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774963A (en) * 1971-08-07 1973-11-27 Universal Oil Co Suspension seats for vehicles
US4235408A (en) * 1978-02-27 1980-11-25 Knoll International, Inc. Swivel-chair frame
US4804068A (en) * 1987-06-17 1989-02-14 Hunter Engineering Company Vehicle elevating apparatus and method of assembly thereof
US4807841A (en) * 1988-03-22 1989-02-28 Serge Abend Omnidirectionally tilting and swivelling support mechanism for chairs or the like
US5026117A (en) * 1987-11-10 1991-06-25 Steelcase Inc. Controller for seating and the like
US5042876A (en) * 1987-11-10 1991-08-27 Steelcase Inc. Controller for seating and the like
US5409295A (en) * 1993-05-25 1995-04-25 Omniflex Specialties Omnidirectional tilting mechanism
US6644744B2 (en) * 2001-10-01 2003-11-11 Johnson Controls Technology Company Release mechanism for a seat
US20160015179A1 (en) * 2014-07-17 2016-01-21 Boss Design Limited Chair

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2051043A (en) * 1934-06-22 1936-08-18 Bassick Co Chair iron
US2424753A (en) * 1947-07-29 herold
US2718257A (en) * 1953-12-01 1955-09-20 Lie Finn Tilting chair
US2971569A (en) * 1956-08-16 1961-02-14 Bassick Co Tiltable office chair
US3598354A (en) * 1969-08-27 1971-08-10 Stewart Warner Corp Chair control structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424753A (en) * 1947-07-29 herold
US2051043A (en) * 1934-06-22 1936-08-18 Bassick Co Chair iron
US2718257A (en) * 1953-12-01 1955-09-20 Lie Finn Tilting chair
US2971569A (en) * 1956-08-16 1961-02-14 Bassick Co Tiltable office chair
US3598354A (en) * 1969-08-27 1971-08-10 Stewart Warner Corp Chair control structure

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774963A (en) * 1971-08-07 1973-11-27 Universal Oil Co Suspension seats for vehicles
US4235408A (en) * 1978-02-27 1980-11-25 Knoll International, Inc. Swivel-chair frame
US4804068A (en) * 1987-06-17 1989-02-14 Hunter Engineering Company Vehicle elevating apparatus and method of assembly thereof
US5026117A (en) * 1987-11-10 1991-06-25 Steelcase Inc. Controller for seating and the like
US5042876A (en) * 1987-11-10 1991-08-27 Steelcase Inc. Controller for seating and the like
US4807841A (en) * 1988-03-22 1989-02-28 Serge Abend Omnidirectionally tilting and swivelling support mechanism for chairs or the like
US5160184A (en) * 1989-07-18 1992-11-03 Steelcase, Inc. Controller for seating and the like
US5409295A (en) * 1993-05-25 1995-04-25 Omniflex Specialties Omnidirectional tilting mechanism
US6644744B2 (en) * 2001-10-01 2003-11-11 Johnson Controls Technology Company Release mechanism for a seat
US20160015179A1 (en) * 2014-07-17 2016-01-21 Boss Design Limited Chair
US10321763B2 (en) * 2014-07-17 2019-06-18 Boss Design Limited Chair

Also Published As

Publication number Publication date
ZA706574B (en) 1971-05-27
AU2066670A (en) 1972-04-13
SE7013323L (en) 1971-04-05
CH523045A (fr) 1972-05-31
AT299483B (de) 1972-06-26
DE2048460A1 (de) 1971-05-27
RO59827A (ro) 1976-05-15
BE756993A (fr) 1971-03-16
FR2064978A5 (ro) 1971-07-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FIRST NATIONAL BANK OF CHICAGO

Free format text: SECURITY INTEREST;ASSIGNOR:BOSTROM ACQUISITION CORPORATION, A CORP OF DE;REEL/FRAME:004371/0101

Effective date: 19850220

AS Assignment

Owner name: BOSTROM ACQUISITION CORPORATION,WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UOP INC., A DE. CORP.;REEL/FRAME:004581/0676

Effective date: 19850220

Owner name: BOSTROM ACQUISITION CORPORATION, EAST LAYTON AVENU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UOP INC., A DE. CORP.;REEL/FRAME:004581/0676

Effective date: 19850220

Owner name: BOSTROM SEATING CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:BOSTROM ACQUISITION CORPORATION;REEL/FRAME:004581/0641

Effective date: 19850515

AS Assignment

Owner name: DNC AMERICA BANKING CORPORATION, 600 FIFTH AVENUE,

Free format text: SECURITY INTEREST;ASSIGNOR:BOSTROM SEATING, INC.;REEL/FRAME:004756/0209

Effective date: 19861015

AS Assignment

Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ILLINOIS

Free format text: SECURITY INTEREST;ASSIGNOR:BOSTROM SEATING, INC.;REEL/FRAME:005122/0677

Effective date: 19881209