US3386770A - Double action chair control - Google Patents

Double action chair control Download PDF

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Publication number
US3386770A
US3386770A US668396A US66839667A US3386770A US 3386770 A US3386770 A US 3386770A US 668396 A US668396 A US 668396A US 66839667 A US66839667 A US 66839667A US 3386770 A US3386770 A US 3386770A
Authority
US
United States
Prior art keywords
support
seat
rotation
torsion bar
chair
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
US668396A
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English (en)
Inventor
Philip J Williams
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.)
Stewart Warner Corp
Original Assignee
Stewart Warner Corp
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 Stewart Warner Corp filed Critical Stewart Warner Corp
Priority to US668396A priority Critical patent/US3386770A/en
Priority to NL6806966A priority patent/NL6806966A/xx
Priority to CH774268A priority patent/CH474980A/fr
Priority to BE716005D priority patent/BE716005A/xx
Application granted granted Critical
Publication of US3386770A publication Critical patent/US3386770A/en
Priority to FR1569404D priority patent/FR1569404A/fr
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
    • 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—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/44—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Supports 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—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/44—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Supports 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—Supports 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

  • This invention relates in general to torsion bar chair controls and more particularly to an improved torsion bar chair control permitting resilient forward tilting of the seat relative the frame or post as well as resilient rearward tilting of the chair back relative the frame or post.
  • the remedy is accomplished by modifying a torsion bar chair control of the type shown in US. Patents 3,136,580 and 3,250,567, issued to Parrott, to divorce the seat support from the frame on forward leaning motion of the chair occupant.
  • the seat pivots forward independently of the frame through a desired angle under rcsilient resistance of the torsion bar which is held through the relationship between the back support and frame.
  • the seat support engages the frame so that the chair back pivots rearwardly under resilient resistance of the same torsion bar, which is then held through the relationship of the seat support and frame.
  • FIG. 1 is a side elevational view of a chair utilizing the principles of the present invention
  • FIG. 2 is an isometric view partially exploded to illustrate the invention.
  • FIG. 3 is a fragmentary sectional view taken along the line 3-3 of FIG. 2.
  • chair It ⁇ can be in the form of a drafting stool or other support frame in which the occupant often is required to lean forward.
  • the chair 10 comprises a chair control indicated at 12 and illustrated in greater detail in FIG. 2.
  • the chair control is in turn supported on a post 14 carried by a pedestal in.
  • the chair control 12 comprises a seat support 18 carrying a chair seat 20 and a back support 22 carrying a chair back 24.
  • the back support 22 comprises a U-shaped bracket 26 carrying a vertically arranged arm 28 to which the back 24 is fastened.
  • the arm 28 is adjustably nested in a recess of the back leg of the bracket 26 to permit height adjustment of the back and is attached thereto by a bolt 35 and a fastener (not shown).
  • the side legs of bracket 26 are adjustably secured to a pair of spaced plates 32 by means of a spacer shaft and sleeve 34 and, a lock adjustment assembly 36 similar to that seen in US. Patents No. 2,093,319 and 3,240,528. Plates 32 are interconnected by an integrally formed back wall 33 adjacent their front end.
  • the spaced plates 32 and Wall 38 are nested adjacent their front end between the side legs 42 of U-shaped frame bracket 44.
  • the frame bracket 44 and a U-shaped frame member 46 form a frame with the back legs of the bracket 44 and frame member 6 staked together and to a post receiving member 48.
  • the post receiving member 48 receives the post 14 so that the axes of the post 14 and frame member 46 are fixed relative each other.
  • the elongate axis of the U-shaped frame member 46 is arranged perpendicular to the elongate axis of the side plates 32 with the bracket 44 nested within the side legs 49 and 50 of the frame member 46.
  • the side plates 32 and wall 38 are nested in a recess 52 of leg 50 intermediate the ends of the leg 50 so that the upper wall of recess 52 serves as a stop for rotation of plates 32 and wall 38 in a counterclockwise direction, as seen in FIGS. 1 and 2.
  • the back leg of the frame member 46 is somewhat longer than the side legs 49 and 50 and the extending ends of the back leg are turned up to form end legs 54 for the frame member projecting above the level of the side legs 49 and 5%.
  • the end legs 54 are staked and welded to the adjacent side legs 49 and St to rigidize the frame member 46.
  • Each end leg 54 has a top stop surface 56, which is generally horizontal and which is bevelled downwardly adjacent the forward end at about 12 to form a second stop surface 58.
  • the seat support 18 comprises a pair of L-shaped arms Whose elongate axes are generally horizontal with one leg portion 60 of each arm being fastened to the seat 29 and overlyin a respective one of the end legs 54 and the adjacent stop surfaces 56 and 58.
  • a torsion bar 62 having a rectangular or other noncircular cross section passes through the plates 32, side legs 42 of bracket 44 and end legs 54 to nonrotata'bly engage a respective correspondingly shaped aperture 64 in the vertical leg portion of each L-shaped seat support arm 18.
  • the plates 32, side legs 42 of bracket 44 and end legs 54 are rotatably supported relative the torsion bar by a respective flanged bushing 66 as explained in the aforementioned Parrott Patents.
  • An annular nylon spacer element 68 having a depending annular wall 79 intermediate its ends and abutting one side of bushing 66 in the end legs 46 serves to space respective arms 18 from the end legs 54 as best seen in FIG. 3.
  • End lock washers 72 prevent axial movement of the bar 62.
  • a torque lever 74 is nonrotatably connected to the torsion bar 62 intermediate the side plates 32 and it projects forwardly from the bar for engagement with the end of an adjusting screw 76.
  • Screw 76 is threaded through the interconnecting wall 38 between plates 32 so that a predetermined degree of tension is placed on the bar 62 and rotation of the back support in a clockwise direction, .as seen in FIGS. 1 and 2, tensions the bar 62.
  • a chair control including a seat support for carrying a seat and a back support for carrying a back with one of said supports rotatably mounted on a torsion bar in turn rotatably carried by a frame member with the other support interconnected with said torsion bar to prevent rotation between said other support and torsion bar, the improvement comprising means on said frame member for engaging one of said supports on rotation of said one support in one direction to thereafter prevent further rotation of said one support in said one direction relative said frame member and for engaging the other support on rotation of said other support in the opposite direction to thereafter prevent further rotation of said other support in said other direction relative said frame member, and means engaged between said one support and a portion of said torsion bar for preventing rotation between said portion and one support to thereby tension said torsion bar in response to either rotation of said one support in said other direction and the engagement of said other support with said frame means or rotation of said other support in said one direction and engagement of said one support with said frame means.
  • a chair control including a seat support for carrying a seat and a back support for carrying a back with said back support rotatably mounted on a torsion bar rotatably carried by a frame member with said seat support interconnected with said torsion 'bar to prevent rotation between the connected portion of said bar and seat support, the improvement comprising means on said frame member for engaging said back support on rotation of said back support in a forward direct-ion relative said seat support to thereafter prevent further rotation in said forward direction by said back support and for engaing said seat support on rotation of said seat support in a backward direction to thereafter prevent rotation of said seat support in said backward direction, and means engaged between said back support and a portion of said torsion 'bar for preventing rotation between said portion and said back support to thereby tension said torsion bar in response to either rotation of said back support in said backward direction and the engagement of said seat support with said frame or rotation of said seat support in said forward direction and engagement of said back support with said means on said frame.
  • a chair control including a seat support for carrying a seat and a back support for carrying a back, the improvement comprising a frame member, a torsion bar having opposite ends interconnected with said seat sup port to prevent relative rotation therebetween and rotatably supported on said frame member, means rotatably supporting said back support on said torsion bar, means engaging said seat support with said frame on rotation of said seat support in one direction to thereafter prevent rotation of said torsion bar relative said frame member, means on said frame member for limiting rotational movement of said back support in a direction opposite said one direction, and means engaged between said back support and a portion of said torsion bar for preventing rotation between said portion and said back support to thereby tension said torsion bar in response to either rotation of said back support in said one direction and the engagement of said seat support with said frame or rotation of said seat support in said opposite direction and engagement of said back support with said means on said frame member.
  • a chair control including a seat support for carrying a seat and a back support for carrying a back, the improvement comprising a frame member, a torsion bar having opposite ends interconnected with said seat support to prevent relative rotation therebetween and rotatably supported on said frame member, means rotatably supporting said 'back support on said torsion bar, means engaging said seat support with said frame on rotation of said seat support in a backward direction to thereafter prevent rotation of said torsion bar relative said frame member, means on said frame member for limiting rotational movement of said back support in a forward direction, means engaged between said back support and a portion of said torsion far for preventing rotation between said portion and back support to thereby tension said torsion bar in response to either rotation of said back support in a backward direction and the engagement of said seat support with said frame or rotation of said seat support in a forward direction and engagement of said back support with said means on said frame member, and means on said frame member limiting rotation of said seat support in said forward direction after said seat support rotates through a predetermined are against
  • a chair control including a seat support for carrying a seat and a back support for carrying a back, the improvement comprising a frame member having end legs adjacent said seat support and overlapped by said seat support, a torsion bar having opposite ends interconnected with said seat support to prevent relative rotation there between, means rotatably supporting said torsion bar in said end legs, means rotatably supporting said back support on said torsion bar intermediate said end legs, said seat support engaging said end legs on rotation of said seat support in one direction to thereafter prevent rot tion of said torsion bar relative said frame member, stop I means on said frame member for limiting rotational movement of said back support in a direction opposite said one direction, means engaged between said back support and a portion of said torsion bar intermediate said end legs for preventing rotation between said portion and back support to thereby tension said torsion bar in response to either rotation of said back support in said one direction and the engagement of said seat support With said overlapped end legs or rotation of said seat support in said opposite direction and engagement of said back support with said stop means.

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  • Chairs Characterized By Structure (AREA)
US668396A 1967-09-18 1967-09-18 Double action chair control Expired - Lifetime US3386770A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US668396A US3386770A (en) 1967-09-18 1967-09-18 Double action chair control
NL6806966A NL6806966A (forum.php) 1967-09-18 1968-05-16
CH774268A CH474980A (fr) 1967-09-18 1968-05-24 Dispositif de réglage d'une chaise
BE716005D BE716005A (forum.php) 1967-09-18 1968-05-31
FR1569404D FR1569404A (forum.php) 1967-09-18 1968-06-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US668396A US3386770A (en) 1967-09-18 1967-09-18 Double action chair control

Publications (1)

Publication Number Publication Date
US3386770A true US3386770A (en) 1968-06-04

Family

ID=24682153

Family Applications (1)

Application Number Title Priority Date Filing Date
US668396A Expired - Lifetime US3386770A (en) 1967-09-18 1967-09-18 Double action chair control

Country Status (5)

Country Link
US (1) US3386770A (forum.php)
BE (1) BE716005A (forum.php)
CH (1) CH474980A (forum.php)
FR (1) FR1569404A (forum.php)
NL (1) NL6806966A (forum.php)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695707A (en) * 1970-11-19 1972-10-03 American Seating Co Recliner vehicle seat
US3989297A (en) * 1973-01-29 1976-11-02 Fritz Kerstholt Chair or couch with a movable back support
US4438978A (en) * 1981-11-18 1984-03-27 Tor Arild Tilt back mechanism for a chair
US4478454A (en) * 1981-06-08 1984-10-23 Steelcase Inc. Weight-actuated chair control
US4479679A (en) * 1981-06-08 1984-10-30 Steelcase Inc. Body weight chair control
US5209548A (en) * 1990-11-14 1993-05-11 Giroflex Entwicklungs Ag Chair, in particular office chair
US6422649B2 (en) * 1998-07-27 2002-07-23 Ashfield Engineering Company Wexford Limited Chair
EP1252839A3 (en) * 2001-04-27 2004-01-14 Plasticline Srl Chair with adjustable back
US7887131B2 (en) 2004-07-08 2011-02-15 Knoll, Inc. Lumbar support
US20130001994A1 (en) * 2011-06-30 2013-01-03 Yao-Chuan Wu Chair with a Resilient Back

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045925A1 (de) * 1980-08-08 1982-02-17 F. Martin Steifensand Sitzmöbel- und Tischfabrik GmbH & Co. KG Sitzmöbel, insbesondere Bürodrehsessel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760553A (en) * 1954-06-07 1956-08-28 Lie Finn Tilting chair
US3136580A (en) * 1962-05-22 1964-06-09 Bassick Co Chair control
US3224807A (en) * 1963-07-19 1965-12-21 Steelcase Inc Back support adjustment for torsion chair
US3240528A (en) * 1964-03-11 1966-03-15 Stewart Warner Corp Control for executive posture chair
US3250567A (en) * 1964-02-21 1966-05-10 Stewart Warner Corp Chair control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760553A (en) * 1954-06-07 1956-08-28 Lie Finn Tilting chair
US3136580A (en) * 1962-05-22 1964-06-09 Bassick Co Chair control
US3224807A (en) * 1963-07-19 1965-12-21 Steelcase Inc Back support adjustment for torsion chair
US3250567A (en) * 1964-02-21 1966-05-10 Stewart Warner Corp Chair control
US3240528A (en) * 1964-03-11 1966-03-15 Stewart Warner Corp Control for executive posture chair

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695707A (en) * 1970-11-19 1972-10-03 American Seating Co Recliner vehicle seat
US3989297A (en) * 1973-01-29 1976-11-02 Fritz Kerstholt Chair or couch with a movable back support
US4478454A (en) * 1981-06-08 1984-10-23 Steelcase Inc. Weight-actuated chair control
US4479679A (en) * 1981-06-08 1984-10-30 Steelcase Inc. Body weight chair control
US4438978A (en) * 1981-11-18 1984-03-27 Tor Arild Tilt back mechanism for a chair
US5209548A (en) * 1990-11-14 1993-05-11 Giroflex Entwicklungs Ag Chair, in particular office chair
US6422649B2 (en) * 1998-07-27 2002-07-23 Ashfield Engineering Company Wexford Limited Chair
EP1252839A3 (en) * 2001-04-27 2004-01-14 Plasticline Srl Chair with adjustable back
US7887131B2 (en) 2004-07-08 2011-02-15 Knoll, Inc. Lumbar support
US8480171B2 (en) * 2004-07-08 2013-07-09 Knoll, Inc. Office chair
US20130001994A1 (en) * 2011-06-30 2013-01-03 Yao-Chuan Wu Chair with a Resilient Back

Also Published As

Publication number Publication date
NL6806966A (forum.php) 1969-03-20
FR1569404A (forum.php) 1969-05-30
CH474980A (fr) 1969-07-15
BE716005A (forum.php) 1968-10-16

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