US3837705A - Office chair - Google Patents

Office chair Download PDF

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Publication number
US3837705A
US3837705A US00326334A US32633473A US3837705A US 3837705 A US3837705 A US 3837705A US 00326334 A US00326334 A US 00326334A US 32633473 A US32633473 A US 32633473A US 3837705 A US3837705 A US 3837705A
Authority
US
United States
Prior art keywords
disc
seat
rack
hub
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
US00326334A
Other languages
English (en)
Inventor
F Marraccini
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.)
Olivetti SpA
Original Assignee
Olivetti SpA
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
Priority to IT67267/72A priority Critical patent/IT948963B/it
Priority to GB295173A priority patent/GB1414911A/en
Application filed by Olivetti SpA filed Critical Olivetti SpA
Priority to US00326334A priority patent/US3837705A/en
Priority to FR7302853A priority patent/FR2170684A5/fr
Priority to DE2304915A priority patent/DE2304915C2/de
Priority to JP48012109A priority patent/JPS4883960A/ja
Application granted granted Critical
Publication of US3837705A publication Critical patent/US3837705A/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
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/025—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of a rack-and-pinion or like gearing mechanism
    • 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
    • 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

Definitions

  • a pair of projections in the slider ride in helical grooves in the hub so that as the slider is moved axially the back is rotated.
  • a rack attached to the back and slidable in the back supporting member is engaged by a spiral gear member attached to the back supporting member for controlling the height of the back.
  • the present invention relates generally to office chairs and more particularly to secretarial chairs, having adjustable seat heights and back supports.
  • a secretarys work area generally includes a desk with one or more telephones, a table for a typewriter and one or more shelves or filing cabinets for documents.
  • a secretarial chair must therefore be easily movable on the floor and must have a seat which is adjustable in height and a back which is adjustable both in height and in inclination, so as to adapt itself to the various working positions adopted by the users.
  • a number of chairs are known on which one or more adjustments can be made.
  • the inclination of the back or its support with respect to the seat is generally effected by means of snap detent elements or by means of differential-type gears, for example of the type with internally toothed wheels.
  • Applicant provides a chair having an improved mechanism for adjusting the angle of a back supporting member which includes a hub proximate the lower end of the back supporting member and fixedly attached thereto and a slider mounted within the hub for axial motion with respect to the hub, the slider including a threaded aperture. Also included are means for preventing angular motion of the slider with respect to the seat and a screw engaging the slider at the threaded aperture. Cooperating projecting and recessed portions carried, one each, by the slider and the internal face of the hub angularly lock the hub with respect to the slider, the portion carried by the internal face of the hub extending helically along the internal face relative to the axis of the hub.
  • means for adjusting the height of the back with respect to the seat which include a rack attached to the back and slidable in a hollow portion of the back supporting member and a spirally threaded element rotatably mounted on the hollow member and an inclination with the rack for engaging a tooth of the rack with only the portion of the spiral thread inclined toward the rack.
  • FIG. 1 is a side view from the right ofa chair embodying the invention
  • FIG. 2 is a plan view of the chair of FIG. 1;
  • FIG. 3 is a section of the device for adjusting the inclination of the support for the back of the chair of FIG. 1;
  • FIG. 4 is a section on the line lV-IV of FIG. 3;
  • FIG. 5 is a section of the device for adjusting the height of the back support
  • FIG. 6 is a section on the line VI-VI of FIG. 5;
  • FIG. 7 is a section of the device for angular adjustment of the chair back
  • FIG. 8 is a section of the device for adjusting the height of the seat.
  • FIG. 9 is a section on the line IXIX of FIG. 8.
  • the office chair essentially comprises a supporting structure 1, a seat 2 and a back 3.
  • the supporting structure 1 is formed by a vertical sleeve member 4 supported by a horizontal cross having four arms 6 radiating from the sleeve at intervals of degrees and each carrying a castor 7 for facilitating movement of the chair.
  • This device 8 is constituted by a screw and nut connection in which the screw 9 (FIG. 8) which is fixed to a support plate 11 (FIG. 1) for the seat 2, engages a nut 12 fitted to the sleeve 4.
  • a ring 13 disposed between a shoulder 14 of the nut 12 and the sleeve 4 of the supporting structure 1 is provided with three lugs 16 (FIG. 9) spaced from one another at intervals of degrees.
  • the ring 13 is moreover provided with a tooth 17 projecting inwardly and cooperating with a longitudinal groove 18 (FIG. 8) with which the screw 9 is provided.
  • Each of the three lugs 16 is furnished with a dog 19 projecting above the surface of the ring 13 and adapted to engage a corresponding radial groove 21 formed in the shoulder 14 of the nut 12.
  • the screw 9 is covered by a corrugated sheath of a flexible plastic material engaged between a shoulder 23 of the nut 12 and a flange, not visible in FIG. 1, carried at the bottom of the support plate 11 (FIG. 1).
  • the ring 13 (FIG. 8) is held angularly fast with the screw 9 by the keying action of the tooth 17 in the groove 18. It is also normally held angularly fast with the nut 12 by the engagement of the grooves 21 of the nut 12 by the dogs 19. This prevents any rotation of the nut 12 under the weight of the user, and holds the screw 9 fast with the nut 12 thereby preventing any variation in the height of the seat 2.
  • Adjustment of the height of the seat 2 is effected by turning the nut 12 manually in one direction or the other when the chair is not occupied.
  • the dogs 19 then disengage themselves from the grooves 21, as a result of which the ring 13 and the screw 9 are angularly released by the nut 12. This therefore causes raising or lowering of the screw 9 and, consequently, also of the seat 2.
  • the tooth 17 of the ring 13 slides along the groove 18.
  • the support plate 11 (FIG. 1) has a forked extension arm 24 having two symmetrical lugs 26 (FIG. 2). Each lug 26 has a recess 27 (FIG. 3) of substantially circular form. Between the two lugs 26 there is arranged a device 28 for adjusting the inclination of the back.
  • the lugs 26 have three pairs of holes in alignment with one another, namely central hole 29 and two pairs of holes 31 symmetrical with respect to holes 29.
  • the holes 31 permit the passage of two guide pins 33.
  • These two guide pins 33 are fixed in one of the lugs 26 by means of milled portions 34 having a diameter slightly greater than that of the respective pin 33 so as to become jammed in the corresponding hole 31.
  • Each end portion 36 of the control screw 32 has a bore 37 into which there is inserted a pin 38 which is locked at the ends in two slots in a washer 39.
  • the washer 39 is fixed together with the terminal portion 36 of the control screw 32 in the inner part of a corresponding knob 41. The two knobs 41 are thus held fast with one another and with the screw 32.
  • the control screw 32 has a threaded central portion screwed through a slider 42.
  • the slider 42 is provided with two opposite notches 43 (FIG. 4) fitting slidably over the two guide pins 33, and with two inclined projections 44 mating in two helical grooves 46 (FIG. 3) formed in the inner part of a hub 47.
  • This hub is rigid with the lower terminal portion of a bar 48 of rectangular cross section supporting the back 3.
  • Two washers 49 of antifriction material for reducing the friction between the hub 47 and the lugs 26.
  • the washers 49 are both drilled to permit the passage of the guide pins 33 and the control screw 32.
  • Adjustment of the inclination of the back is effected by manually rotating one or the other of the two knobs 41.
  • the rotation of the knobs 41 is transmitted to the control screw 32, which causes the slider 42 to shift axially on the guide pins 33.
  • the projections 44 engaged in the oblique grooves 46 cause the hub 47 to rotate and with it the bar 48 and the back 3 (FIG. 1).
  • Adjustment of the inclination of the bar 48 supporting the back 3 is effected between the extreme positions indicated by the dash lines in FIG. 1 which form an angle of about 40 degrees containing the vertical position. More particularly, by causing the slider 42 to shift to the right the back is brought to the rear.
  • a position of the back 3 is provided in which the bar 48 of the back 3 is free and can turn freely to the rear. This position is used for reducing the over-all dimensions of the chair for packing. This position is reached by shifting the slider 42 (FIG. 3) completely to the right into correspondence with a recess 45 of the hub 47. The slider 42 then disengages the projections 44 from the grooves 46 and therefore the hub 47 and the bar 48 of the back 3 are free to turn.
  • the bar 48 of the back 3 (FIG. 1) is provided with a device 52 for adjusting the height of the back 3.
  • the bar 48 (FIG. is a hollow and has at the top an axial opening 53 in which there is engaged a guide element 56 in which a rod 57 is slidable.
  • the guide element 56 is clamped to the bar 48 by an extension thereof extending into a hollow 54 in the bar 48.
  • the rod 57 has in its central portion a rack 58 which is engaged by a spiral projecting rib 59 (FIG. 6) of a knob 61 rotatable in a seat 62 (FIG. 5) formed in the guide element 56.
  • the knob 61 is in an inclined position with respect to the rack 58, in such manner that only the upper portion of the projecting spiral rib 59 engages a tooth of the rack 58.
  • the height of the rib 59 increases from the periphery towards the center of the knob 61 so as to keep the inner turn of the rib 59 in mesh with the rack 58.
  • the beginning and end of the projecting rib 59 are adapted to engage simultaneously with the rack 58 (FIG. 5), that is the pitch of the rack is equal to the radial pitch of the spiral, as a result of which a uniform and continuous movement of the rod 57 is obtained during the rotation of the knob 61.
  • the guide element 56 has a tooth 63 (FIG. 5) engaging an annular groove 64 in the knob 61 for preventing the knob 61 leaving its seat.
  • the knob 61 is mounted on the element 56 from the right-hand side thereof, in FIG. 5, before the element 56 is fitted on the bar 48.
  • a friction device 66 (FIG. 7) is used for the angular adjustment of the back 3 with respect to the rod 57 and includes a hub 67 integral with the rod 57 (FIG. 5).
  • the hub 67 (FIG. 7) is disposed between two lugs 68 integral with a supporting structure 69 for the back 3.
  • Each lug 68 is provided with a recess 71 at the base of which there is provided a hole 72 of rectangular form with two circular sides, while the hub 67 is provided with a hole 73 of circular section.
  • each pair of holes 72 and 73 there is housed a stem 74 of a corresponding knob 76.
  • the stem 74 Provided in the stem 74 are four longitudinal slots 77 which define four bendable axial portions 75, while internally it is adapted to house a resilient member 78 having a C-shaped cross section and forming a spring which acts to spread the bendable portions of the stem 74 apart.
  • a resilient member 78 having a C-shaped cross section and forming a spring which acts to spread the bendable portions of the stem 74 apart.
  • annular portion 79 projecting to the inside to retain the resilient member 78 and having a substantially square form on the outside, so as to clamp the stem 74 in the hole 72 and render the knobs fast with the structure 69.
  • the portions 75 of the stem 74 of the knob 76 tend to expand under the thrust of the profile 78, producing a frictional engagement between the stem 74 and the hole 73 and, therefore, the structure 69 and the rod 57. Because of the aforesaid frictional engagement, the back 3 is not free to turn or pivot, but can nevertheless be brouhgt into the desired position by exerting a force sufficient to overcome the friction between the stem 74 of the knobs 76 and the hole 73.
  • a chair comprising: a seat; a back; and means connecting the seat and the back for selectively adjusting the distance between the seat and the back, said means comprising a hollow member, a toothed rack connected to said back and slidable in said hollow member, a rotatable disc having an annular groove on the periphery thereof, a projection extending from one side of said disc for manually rotating same, a spiral rib projecting from another side of said disc opposite to said one side, means mounting said disc in an inclined position with respect to said rack to enable a tooth of said rack to engage with only the portion of said spiral rib inclined towards said rack, and means solely in contact with said disc for rotatably mounting same on said hollow member comprising a guide element fixed to said hollow member and engaging said annular groove on the periphery of said disc.
  • a chair according to claim -1 wherein the height of said spiral rib from said disc increases towards the center thereof.
  • said guide element comprises an annular tooth which engages said annular groove.
  • a chair according to claim 2 wherein said hollow element is disposed adjacent to said back at a predetermined distance therefrom and said projection extends between said hollow element and said back less than said predetermined distance.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
US00326334A 1972-01-31 1973-01-24 Office chair Expired - Lifetime US3837705A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
IT67267/72A IT948963B (it) 1972-01-31 1972-01-31 Sedia per ufficio particolarmente per segretarie
GB295173A GB1414911A (en) 1972-01-31 1973-01-19 Office chair in particular for secretaries
US00326334A US3837705A (en) 1972-01-31 1973-01-24 Office chair
FR7302853A FR2170684A5 (xx) 1972-01-31 1973-01-26
DE2304915A DE2304915C2 (de) 1972-01-31 1973-01-30 Bürostuhl
JP48012109A JPS4883960A (xx) 1972-01-31 1973-01-31

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67267/72A IT948963B (it) 1972-01-31 1972-01-31 Sedia per ufficio particolarmente per segretarie
US00326334A US3837705A (en) 1972-01-31 1973-01-24 Office chair

Publications (1)

Publication Number Publication Date
US3837705A true US3837705A (en) 1974-09-24

Family

ID=42040261

Family Applications (1)

Application Number Title Priority Date Filing Date
US00326334A Expired - Lifetime US3837705A (en) 1972-01-31 1973-01-24 Office chair

Country Status (6)

Country Link
US (1) US3837705A (xx)
JP (1) JPS4883960A (xx)
DE (1) DE2304915C2 (xx)
FR (1) FR2170684A5 (xx)
GB (1) GB1414911A (xx)
IT (1) IT948963B (xx)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062587A (en) * 1976-01-13 1977-12-13 Herman Miller, Inc. Back position control device for chairs
US4291914A (en) * 1980-01-10 1981-09-29 Hoover Universal, Inc. Adjustable seat hinge
US4616877A (en) * 1985-05-09 1986-10-14 Kimball International, Inc. Chair with back height adjustment
US4640547A (en) * 1983-09-17 1987-02-03 Heinrich Fromme Adjustable swivel chair
US4662681A (en) * 1983-09-07 1987-05-05 Paolo Favaretto Adjustable chair
EP0252274A2 (de) * 1986-07-10 1988-01-13 Hellmuth Moll Stuhlartige Sitzvorrichtung
US4786108A (en) * 1986-10-16 1988-11-22 Burositzmobelfabrik Friedrich-W. Dauphin Gmbh & Co. Chair, in particular office chair, with a vertically adjustable back rest support
US4793655A (en) * 1987-03-20 1988-12-27 Kval Marketing Inc. Multi-position convertible therapeutic chair
GB2253138B (en) * 1991-02-08 1995-05-03 Evertaut Limited A chair
DE19930364A1 (de) * 1999-07-01 2001-01-11 Faure Bertrand Sitztech Gmbh Neigungsverstellvorrichtung für die Rückenlehne eines Kraftfahrzeugsitzes
US20030111890A1 (en) * 2001-12-14 2003-06-19 Jurgen Zimmermann Chair
US20070246990A1 (en) * 2006-04-20 2007-10-25 Distribution Gablex Inc. Abdominal support swivel chair
US20110272976A1 (en) * 2007-10-31 2011-11-10 Wen Wei Tattoo chair
CN103171657A (zh) * 2010-02-23 2013-06-26 株式会社岛野 高度可调的座位杆组件

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421253Y2 (xx) * 1974-09-28 1979-07-28
CH590031A5 (xx) * 1975-01-10 1977-07-29 Fehlbaum & Co
SE449688B (sv) * 1984-10-17 1987-05-18 Liedberg Ostlund Ab Arbetsstol med svengbart ryggstod
DE20113075U1 (de) * 2001-08-13 2002-09-26 Baur Albert Abstützvorrichtung für Sitz-/Liegemöbel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US128775A (en) * 1872-07-09 Improvement in dentists and barbers chairs
US360855A (en) * 1887-04-12 John w
US779633A (en) * 1904-03-17 1905-01-10 Globe Jack Company Lifting-jack.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1170708A (en) * 1967-04-06 1969-11-12 Recaro A G Hinge Fitment
US3544160A (en) * 1968-12-27 1970-12-01 Universal Oil Prod Co Seat back positioning system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US128775A (en) * 1872-07-09 Improvement in dentists and barbers chairs
US360855A (en) * 1887-04-12 John w
US779633A (en) * 1904-03-17 1905-01-10 Globe Jack Company Lifting-jack.

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062587A (en) * 1976-01-13 1977-12-13 Herman Miller, Inc. Back position control device for chairs
US4291914A (en) * 1980-01-10 1981-09-29 Hoover Universal, Inc. Adjustable seat hinge
US4662681A (en) * 1983-09-07 1987-05-05 Paolo Favaretto Adjustable chair
US4640547A (en) * 1983-09-17 1987-02-03 Heinrich Fromme Adjustable swivel chair
US4616877A (en) * 1985-05-09 1986-10-14 Kimball International, Inc. Chair with back height adjustment
EP0252274A2 (de) * 1986-07-10 1988-01-13 Hellmuth Moll Stuhlartige Sitzvorrichtung
EP0252274A3 (de) * 1986-07-10 1988-05-25 Hellmuth Moll Stuhlartige Sitzvorrichtung
US4786108A (en) * 1986-10-16 1988-11-22 Burositzmobelfabrik Friedrich-W. Dauphin Gmbh & Co. Chair, in particular office chair, with a vertically adjustable back rest support
US4793655A (en) * 1987-03-20 1988-12-27 Kval Marketing Inc. Multi-position convertible therapeutic chair
GB2253138B (en) * 1991-02-08 1995-05-03 Evertaut Limited A chair
DE19930364A1 (de) * 1999-07-01 2001-01-11 Faure Bertrand Sitztech Gmbh Neigungsverstellvorrichtung für die Rückenlehne eines Kraftfahrzeugsitzes
US20030111890A1 (en) * 2001-12-14 2003-06-19 Jurgen Zimmermann Chair
US6719373B2 (en) * 2001-12-14 2004-04-13 Dauphin Entwicklungs-U. Beteiligungs-Gmbh Chair with a headrest
US20070246990A1 (en) * 2006-04-20 2007-10-25 Distribution Gablex Inc. Abdominal support swivel chair
US7618090B2 (en) * 2006-04-20 2009-11-17 Distribution Gablex Inc. Abdominal support swivel chair
US20110272976A1 (en) * 2007-10-31 2011-11-10 Wen Wei Tattoo chair
US8864233B2 (en) * 2007-10-31 2014-10-21 Wen Wei Tattoo chair
CN103171657A (zh) * 2010-02-23 2013-06-26 株式会社岛野 高度可调的座位杆组件
CN103171657B (zh) * 2010-02-23 2015-03-18 株式会社岛野 高度可调的座位杆组件

Also Published As

Publication number Publication date
DE2304915C2 (de) 1984-12-06
IT948963B (it) 1973-06-11
GB1414911A (en) 1975-11-19
FR2170684A5 (xx) 1973-09-14
JPS4883960A (xx) 1973-11-08
DE2304915A1 (de) 1973-08-09

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