US3669399A - Mechanism for the tiltable seat of a chair - Google Patents
Mechanism for the tiltable seat of a chair Download PDFInfo
- 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
Links
Images
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)
Abstract
Description
Claims (6)
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 (en) |
AT (1) | AT299483B (en) |
AU (1) | AU2066670A (en) |
BE (1) | BE756993A (en) |
CH (1) | CH523045A (en) |
DE (1) | DE2048460A1 (en) |
FR (1) | FR2064978A5 (en) |
RO (1) | RO59827A (en) |
SE (1) | SE7013323L (en) |
ZA (1) | ZA706574B (en) |
Cited By (9)
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)
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 |
-
0
- BE BE756993D patent/BE756993A/en unknown
-
1970
- 1970-09-25 ZA ZA706574A patent/ZA706574B/en unknown
- 1970-10-01 SE SE1332370A patent/SE7013323L/en unknown
- 1970-10-01 CH CH1456270A patent/CH523045A/en not_active IP Right Cessation
- 1970-10-02 AU AU20666/70A patent/AU2066670A/en not_active Expired
- 1970-10-02 FR FR7035774A patent/FR2064978A5/fr not_active Expired
- 1970-10-02 AT AT890670A patent/AT299483B/en active
- 1970-10-02 DE DE19702048460 patent/DE2048460A1/en active Pending
- 1970-10-03 RO RO64585A patent/RO59827A/ro unknown
- 1970-10-05 US US77998A patent/US3669399A/en not_active Expired - Lifetime
Patent Citations (5)
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)
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 |
---|---|
CH523045A (en) | 1972-05-31 |
RO59827A (en) | 1976-05-15 |
FR2064978A5 (en) | 1971-07-23 |
AU2066670A (en) | 1972-04-13 |
SE7013323L (en) | 1971-04-05 |
BE756993A (en) | 1971-03-16 |
DE2048460A1 (en) | 1971-05-27 |
ZA706574B (en) | 1971-05-27 |
AT299483B (en) | 1972-06-26 |
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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 |