US3574400A - Polypropylene armchair - Google Patents

Polypropylene armchair Download PDF

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Publication number
US3574400A
US3574400A US751507A US3574400DA US3574400A US 3574400 A US3574400 A US 3574400A US 751507 A US751507 A US 751507A US 3574400D A US3574400D A US 3574400DA US 3574400 A US3574400 A US 3574400A
Authority
US
United States
Prior art keywords
seat
arms
chair
shell
channel
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
US751507A
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English (en)
Inventor
Robin Henry Day
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.)
HILLE AND CO Ltd S
Original Assignee
HILLE AND CO Ltd S
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 HILLE AND CO Ltd S filed Critical HILLE AND CO Ltd S
Application granted granted Critical
Publication of US3574400A publication Critical patent/US3574400A/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
    • A47C3/12—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats with shell-shape seat and back-rest unit, e.g. having arm rests
    • 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

  • This invention relates to shells for chairs of the type comprising a unitary shell forming the seat, arms and back of the chair supported by a frame attached to the underside of the seat portion of the shell.
  • a major problem in the design of shells for such chairs is the provision of sufficient rigidity, especially in response to loadings due to a user leaning against the back of the chair, and particularly in the case of chairs having arms lounging sideways in the chair.
  • a limited degree of local defonnability in certain parts of the chair shell is desirable since it enhances the comfort of a user, but it is necessary to avoid any substantial distortion of the shape of the shell as a whole, and in particular distortions likely to cause fatigue failure of the shell material.
  • Two main expedients are known for this purpose. Firstly, a rolled section or flange can be provided along at least selected parts of the edge of the chair shell. Secondly, if the shell is designed to include integral arms, these help relieve the bending stresses that would otherwise be applied at the junction of the seat and the back. In neither case is any variation in the thickness of the shell required, but even in combination these expedients do not overcome the liability of the shell to certain types of distortion, in particular those caused by the forms of user behavior outlined above.
  • One solution to this problem would be to extend the rolled section of flange to form a completed tubular section around the edge of the chair, but such sections cannot be formed by injection moulding.
  • a unitary moulded chair shell forming the seat, arms and back of a chair, provided with a continuous rolled flange forming a channel extending along the under or rear side of the front edges of the arm and seat portions of the shell, also comprises integral webs extending across said channel in the regions where the arms merge with the seat.
  • the advantage of this construction is that the provision of such webs provides the desired stiffening of the chair shell with the minimum of additional material and without altering the general appearance of the shell, the webs being inconspicuous due to their location, whilst they are readily produced by injection moulding techniques; moreover alteration of the number and exact location of the webs can be carried out without major modification of the mould used.
  • the invention is particularly useful in the moulding of chair shells from thermoplastic materials such as polypropylene or polyethylene, and overcomes the liability to excessive distortion which has hitherto been a serious disadvantage of moulded thermoplastic chair shells.
  • FIG. 1 shows a perspective view of a chair shell in accordance with the invention, partially broken away in order to clarify the construction
  • FIG. shows an underneath plan of the same shell
  • FIG. 3 shows on an enlarged scale, a part section of the shell on the line lll-lll in FIG. 2.
  • the chair shell 1 comprising a seat portion 2, a back portion 3 and arm portions 4 has been shown, the frame being omitted: this may take a number of forms, and is attached by screws to bosses 5 formed integrally on the lower surface of the seat portion 2.
  • the edges of the shell are turned downwardly and/or rearwardly to form a rolled flange 6 around the periphery of the shell, the extent of this roll along at least the front edges of the arms and seat, and in the example shown also the top edges of the arms, being sufficient to form a channel 7.
  • this channel is spanned by a number of webs 8.
  • the number and spacing of the webs can be varied experimentally to suit differing designs of shell: it will normally be possible to modify an existing mould in order to add additional webs if necessary.
  • the webs are approximately the same thickness as the main shell.
  • a unitary injection molded chair shell forming a seat, back and arms of a chair, said chair shell being provided with a continuous open angularly disposed flange forming achannel extending along the outside of at least front edges of the arm and the underside of a front edge of said seat, characterized by the provision of a plurality of integral injection molded webs extending across said channel from a location beneath said seat to a location along said arms and across a juncture of said arms and said seat thereby preventing distortion of the chairback and of the chairback relative to the arms due to a users applying with his back either rearward or combined rearward and sideways forces to the back or both the back and either arm of the chair.

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Ladders (AREA)
  • Seats For Vehicles (AREA)
US751507A 1967-08-18 1968-08-09 Polypropylene armchair Expired - Lifetime US3574400A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38211/67A GB1209767A (en) 1967-08-18 1967-08-18 Moulded chair shell

Publications (1)

Publication Number Publication Date
US3574400A true US3574400A (en) 1971-04-13

Family

ID=10401978

Family Applications (1)

Application Number Title Priority Date Filing Date
US751507A Expired - Lifetime US3574400A (en) 1967-08-18 1968-08-09 Polypropylene armchair

Country Status (11)

Country Link
US (1) US3574400A (da)
BE (1) BE719608A (da)
CH (1) CH467605A (da)
DE (2) DE1779477B2 (da)
DK (1) DK122003B (da)
ES (1) ES153080Y (da)
FI (1) FI45722C (da)
FR (1) FR1584385A (da)
GB (1) GB1209767A (da)
NL (1) NL141369B (da)
SE (1) SE351361B (da)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5342110A (en) * 1992-07-06 1994-08-30 Dant Corporation Stadium chair seating system
US5411316A (en) * 1993-10-13 1995-05-02 Westinghouse Electric Corporation Single piece chair shell
US5415461A (en) * 1993-10-29 1995-05-16 Sakamoto; Alice Furniture construction
USD384388S (en) * 1995-11-07 1997-09-30 Eddy Deanna M Swing seat
US5810438A (en) * 1994-06-13 1998-09-22 Herman Miller, Inc. One piece molded seating structure
US5813722A (en) * 1994-03-18 1998-09-29 Hartman Leisure Australia Pty. Ltd. Stackable chair
USD484941S1 (en) 2003-02-24 2004-01-06 Deanna Johnson Baby swing seat
US6682138B2 (en) * 2002-03-29 2004-01-27 Adams Mfg. Corp. Resin molded folding chair
USD533728S1 (en) 2004-03-25 2006-12-19 Steelcase Development Corporation Seat
US7287816B1 (en) 2004-10-01 2007-10-30 Norix Group, Inc. Chair and grouping thereof
USD636612S1 (en) 2010-02-01 2011-04-26 Steelcase Inc. Seating unit
USD636613S1 (en) 2010-02-01 2011-04-26 Steelcase Inc. Seating unit
USD646085S1 (en) 2010-02-01 2011-10-04 Steelcase Inc. Seating unit
USD646497S1 (en) 2010-02-01 2011-10-11 Steelcase Inc. Seating unit
USD660055S1 (en) * 2010-03-18 2012-05-22 Steelcase Inc. Seating unit
USD660054S1 (en) * 2010-03-18 2012-05-22 Steelcase Inc. Seating unit
USD679524S1 (en) 2010-02-01 2013-04-09 Steelcase Inc. Seating unit
USD704945S1 (en) 2013-05-16 2014-05-20 Steelcase Inc. Chair
USD705561S1 (en) 2013-05-16 2014-05-27 Steelcase Inc. Chair
USD708466S1 (en) 2013-05-16 2014-07-08 Steelcase Inc. Chair
WO2015195672A1 (en) * 2014-06-16 2015-12-23 Comfort Research, Llc Furniture assembly
USD799232S1 (en) * 2016-06-09 2017-10-10 Sava Cvek Chair shell
USD799233S1 (en) * 2016-06-09 2017-10-10 Sava Cvek Chair with legs
USD799845S1 (en) * 2016-06-09 2017-10-17 Sava Cvek Chair with sled base
USD849434S1 (en) * 2017-10-19 2019-05-28 Williams-Sonoma, Inc. Chair
USD853742S1 (en) * 2016-10-07 2019-07-16 Modernica, Inc. Stool
US10351024B2 (en) * 2017-11-30 2019-07-16 Ford Global Technologies, Llc Ovoid seating assembly
USD893896S1 (en) * 2018-06-29 2020-08-25 Senator International Limited Chair
USD907391S1 (en) * 2019-07-31 2021-01-12 Harvest-Excel International Pte. Ltd. Chair
USD933385S1 (en) * 2019-05-21 2021-10-19 HAY ApS Chair
USD1063423S1 (en) * 2023-05-02 2025-02-25 Naught One Ltd Chair

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622038A1 (de) * 1986-07-01 1988-01-07 Kembo Bv Stuhl oder sessel
WO2015186731A1 (ja) * 2014-06-05 2015-12-10 株式会社岡村製作所 椅子の背凭れ、及び、椅子

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818107A (en) * 1953-05-19 1957-12-31 Thaden Molding Corp Chair
US3173723A (en) * 1964-06-08 1965-03-16 American Seating Co Seat attachment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818107A (en) * 1953-05-19 1957-12-31 Thaden Molding Corp Chair
US3173723A (en) * 1964-06-08 1965-03-16 American Seating Co Seat attachment

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5342110A (en) * 1992-07-06 1994-08-30 Dant Corporation Stadium chair seating system
US5411316A (en) * 1993-10-13 1995-05-02 Westinghouse Electric Corporation Single piece chair shell
US5415461A (en) * 1993-10-29 1995-05-16 Sakamoto; Alice Furniture construction
US5813722A (en) * 1994-03-18 1998-09-29 Hartman Leisure Australia Pty. Ltd. Stackable chair
US5810438A (en) * 1994-06-13 1998-09-22 Herman Miller, Inc. One piece molded seating structure
USD384388S (en) * 1995-11-07 1997-09-30 Eddy Deanna M Swing seat
US6682138B2 (en) * 2002-03-29 2004-01-27 Adams Mfg. Corp. Resin molded folding chair
US20040066063A1 (en) * 2002-03-29 2004-04-08 Adams William E. Resin molded folding chair
USD484941S1 (en) 2003-02-24 2004-01-06 Deanna Johnson Baby swing seat
USD533728S1 (en) 2004-03-25 2006-12-19 Steelcase Development Corporation Seat
USD553872S1 (en) 2004-03-25 2007-10-30 Steelcase Development Corporation Seat
US7287816B1 (en) 2004-10-01 2007-10-30 Norix Group, Inc. Chair and grouping thereof
USD690143S1 (en) 2010-02-01 2013-09-24 Steelcase, Inc. Base for seating unit
USD689723S1 (en) 2010-02-01 2013-09-17 Steelcase, Inc. Base for seating unit
USD646085S1 (en) 2010-02-01 2011-10-04 Steelcase Inc. Seating unit
USD646497S1 (en) 2010-02-01 2011-10-11 Steelcase Inc. Seating unit
US10631645B2 (en) 2010-02-01 2020-04-28 Steelcase Inc. Chair seat to base mounting assembly
US11432650B1 (en) 2010-02-01 2022-09-06 Steelcase Inc. Chair seat to base mounting assembly
USD679524S1 (en) 2010-02-01 2013-04-09 Steelcase Inc. Seating unit
USD679525S1 (en) 2010-02-01 2013-04-09 Steelcase Inc. Seating unit
USD679517S1 (en) 2010-02-01 2013-04-09 Steelcase Inc. Seating unit
USD679523S1 (en) 2010-02-01 2013-04-09 Steelcase Inc. Seating unit
USD679923S1 (en) 2010-02-01 2013-04-16 Steelcase Inc. Base for seating unit
US9962003B2 (en) 2010-02-01 2018-05-08 Steelcase, Inc. Chair seat to base mounting assembly
USD636612S1 (en) 2010-02-01 2011-04-26 Steelcase Inc. Seating unit
US9414686B1 (en) 2010-02-01 2016-08-16 Steelcase Inc. Seat assembly
US9414685B2 (en) * 2010-02-01 2016-08-16 Steelcase Inc. Node seat to base mounting assembly
USD636613S1 (en) 2010-02-01 2011-04-26 Steelcase Inc. Seating unit
US20140210237A1 (en) * 2010-02-01 2014-07-31 Sean M. Corcorran Node seat to base mounting assembly
US9044087B1 (en) * 2010-02-01 2015-06-02 Steelcase, Inc. Seat assembly
US9060609B1 (en) 2010-02-01 2015-06-23 Steelcase, Inc. Seat assembly
USD660054S1 (en) * 2010-03-18 2012-05-22 Steelcase Inc. Seating unit
USD660055S1 (en) * 2010-03-18 2012-05-22 Steelcase Inc. Seating unit
USD708466S1 (en) 2013-05-16 2014-07-08 Steelcase Inc. Chair
USD705561S1 (en) 2013-05-16 2014-05-27 Steelcase Inc. Chair
USD704945S1 (en) 2013-05-16 2014-05-20 Steelcase Inc. Chair
WO2015195672A1 (en) * 2014-06-16 2015-12-23 Comfort Research, Llc Furniture assembly
USD799232S1 (en) * 2016-06-09 2017-10-10 Sava Cvek Chair shell
USD799233S1 (en) * 2016-06-09 2017-10-10 Sava Cvek Chair with legs
USD799845S1 (en) * 2016-06-09 2017-10-17 Sava Cvek Chair with sled base
USD853742S1 (en) * 2016-10-07 2019-07-16 Modernica, Inc. Stool
USD877525S1 (en) 2016-10-07 2020-03-10 Modernica, Inc. Stool
USD849434S1 (en) * 2017-10-19 2019-05-28 Williams-Sonoma, Inc. Chair
US10351024B2 (en) * 2017-11-30 2019-07-16 Ford Global Technologies, Llc Ovoid seating assembly
USD893896S1 (en) * 2018-06-29 2020-08-25 Senator International Limited Chair
USD933385S1 (en) * 2019-05-21 2021-10-19 HAY ApS Chair
USD933384S1 (en) * 2019-05-21 2021-10-19 HAY ApS Chair
USD938176S1 (en) * 2019-05-21 2021-12-14 HAY ApS Chair
USD907391S1 (en) * 2019-07-31 2021-01-12 Harvest-Excel International Pte. Ltd. Chair
USD1063423S1 (en) * 2023-05-02 2025-02-25 Naught One Ltd Chair

Also Published As

Publication number Publication date
SE351361B (da) 1972-11-27
GB1209767A (en) 1970-10-21
DK122003B (da) 1972-01-03
DE1779477B2 (de) 1975-09-04
FR1584385A (da) 1969-12-19
FI45722C (fi) 1972-09-11
ES153080U (es) 1970-01-01
FI45722B (da) 1972-05-31
ES153080Y (es) 1970-10-16
DE6605828U (de) 1970-07-16
NL141369B (nl) 1974-03-15
DE1779477A1 (de) 1972-01-13
BE719608A (da) 1969-02-17
NL6811485A (da) 1969-02-20
CH467605A (fr) 1969-01-31

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