US3601444A - Chair control with support for the torsion spring - Google Patents

Chair control with support for the torsion spring Download PDF

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Publication number
US3601444A
US3601444A US870319A US3601444DA US3601444A US 3601444 A US3601444 A US 3601444A US 870319 A US870319 A US 870319A US 3601444D A US3601444D A US 3601444DA US 3601444 A US3601444 A US 3601444A
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US
United States
Prior art keywords
chair
spring
torsion spring
frame
control
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
US870319A
Inventor
Joseph T Doerner
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.)
Doerner Products Co Ltd
Original Assignee
Doerner Products Co Ltd
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 CA62731 priority Critical
Priority to GB47186/69A priority patent/GB1256388A/en
Priority to NL6914969.A priority patent/NL155445B/en
Priority to FR6935244A priority patent/FR2064690A5/fr
Priority to DE19691957493 priority patent/DE1957493B2/en
Application filed by Doerner Products Co Ltd filed Critical Doerner Products Co Ltd
Application granted granted Critical
Publication of US3601444A publication Critical patent/US3601444A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/022Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024Reclining 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
    • A47C1/027Reclining 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 clamps or friction locking members
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/44Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/441Support 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/44Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/443Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/44Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/443Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
    • A47C7/444Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs of torsion type
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/44Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445Support 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

Abstract

A chair control for tilting chairs and posture chairs having a coiled torsion spring oriented in a horizontal plane with its axis parallel to the pivots on which the control tilts. The chair control has two frames which are pivotally connected to permit relative pivotal movement, one of the frame members being mountable on the top end of the chair post which is carried by the chair base. The torsion spring is supported by a fixed frame of the chair control so that it is fully supported thereby both when at rest and when subjected to torsional stresses induced by a person sitting in the chair when such person leans back in the chair.

Description

I United States Patent [1 13,601,444
[72] Inventor Joseph T. Doerner [56] References Cited 7 wfltsrlw Ontario, Canada UNITED STATES PATENTS {5;} gm 12 1969 2,202,630 10/1970 Hauber 5/309 ux Patented g 1971 3,339,973 9/1967 Doemer 297/300 [73] Assignee Doerner Products Co. Limited Primary ExaminerJames C. Mitchell Waterloo, Ontario, Canada Attorney-George H. Riches 32] Priority Sept. 23, 1969 [33] Canada [31 062,731
ABSTRACT: A chair control for tilting chairs and posture chairs having a coiled torsion spring oriented in a horizontal [54] WITH SUPPORT FOR THE plane with its axis parallel to the pivots on which the control 2 Claim 3 D F tilts. The chair control has two frames which are pivotally conrawmg nected to permit relative pivotal movement, one of the frame [52] U.S. Cl 297/300, members being mountable on the top end of the chair post 248/383 which is carried by the chair base. The torsion spring is sup- [51] Int. Cl A47c 3/00 ported by a fixed frame of the chair control so that it is fully [50] Field of Search 5/309; supported thereby both when at rest and when subjected to torsional stresses induced by a person sitting in the chair when such person leans backin the chair.
PATENTEU AUB24 l9?! Invenror fi p T- Doerner AHorney CHAIR CONTROL WITI-I SUPPORT FOR THE TORSION SPRING I BACKGROUND THE INVENTION The present invention is an improvement on the chair control disclosed in my prior Canadian Pat. No. 771,456 dated Nov. 14, 1967 and its United States counterpart, U.S. Pat. No. 3,339,973 dated Sept. 5, I967. In that structure the torsion spring was supported on a nylon bushing carried on the pivot pin connecting the cooperating pivot elements of the chair control. The pivot pin is thus subjected to considerable strain which, in time, distorts and fatigues the pin.
I have found that the aforesaid-problem can be solved by supporting the spring on a pad, such as nylon, the pad, in turn, being supported on one of the frame members of the chair control, preferably the fixed frame member which is mounted on the chair spindle.
DESCRIPTION OF THE INVENTION The invention will be described as applied to a secretarial chair but it is to be understood that this is by way of illustration only since it is obvious that it can be used with other kinds of chairs.
For an understanding of the present invention and its advantages, reference is to be had to the following description taken in conjunction with the accompanying drawings. in which:
FIG. 1 is a perspective view of a tilter chair employing the chair control of the present invention;
FIG. 2 is a side elevation in cross section through the center of the chair running from front to back thereof to show details of the construction; and
FIG. 3 is a cross-sectional view taken on the same line as FIG. 2 with the back tilted.
FIGS. 1-3 show the present invention as applied to what is commonly known as a posture or secretarial chair.
The posture or secretarial chair incorporates a modified chair control A designed to provide yieldable, backward-tilting support for a tiltable chair back pivotally connected to the chair seat 11 through the medium of the chair control A, the seat in turn being fastened to the control as herein described.
The chair control includes a first frame structure 14 which includes a plate 16 apertured to receive the spigotted end of the spindle l2 and a bushing 13 rigidly attached to the plate l6 with the apertures'in sidewalls 15. A hinge pin 21 is mounted through the said apertures to connect the first and second frames for relative-pivotal movement.
Tilt-resisting spring-biasing means 22 are provided for the chair control to urge the chair back 10 to a normal or first position as illustrated in FIG. 2 and resist movement to the second position as shown in FIG. 3.
The aforementioned spring-biasing means 22 comprise a torsion spring 23 including pair of oppositely wound coils 24, 25 coiled about the hinge pin 21 and mounted between the spaced-apart sidewalls 15. The torsion spring 22 also includes oppositely extending ends 26, 27 of each of said coils 24, 25
' and a first end 28, 29 of each of said coils 24, 25 is joined by a and apertured to receive the shank of the spindle 12. The first connecting portion 30. The connecting portion 30 is connected to the first frame structure 14 by connecting means comprising a threaded rod 31 which is hooked at one end over the connecting portion 30 and which extends at its other end through the plate 16 and is threaded into a manually operable tension-adjustin2g nut 32 for the sprin -biasing means 22, said ad usting nut 3 being easily accessib e on the outside of the first frame member 14.
The hinge'pin passes centrally through the coiled tension spring as shown. The spring 23 is on a support pad 33 which extends under the spring between the spaced-apart sidewalls 15. The pad 33 is preferably made of nylon and has its upper surface concaved to the curvature of the coils. The concaved surface forms a recess into which the coiled spring seats, the spring being thereby restrained against eccentric displacement when the spring is torsionally twisted. The pad 33, in turn, is supported, on the base portion 34 of the frame 16 in close proximity to the bushing 13. The forces created by the torsion spring are thus carried on parts adapted to carry heavy loads.
What I claim is:
l. A chair control having:
a. a first nontiltable frame mountable on a chair base;
b. a second tiltable frame member;
c. a helical torsion spring operatively connected to the frame members to resist relative movement of the frame members in one direction;
(I. a hinge pin pivotally connecting the frame members together for relative pivotal movement, said pin extending axially through the torsion spring; and
. a spring support pad mounted on the first frame underneath the torsion spring, said pad having its upper surface concaved to receive therein adjacent portions of the spring in free slidable relationship whereby the forces generated by the torsionally loaded spring are carried solely on said support member and the spring is restrained against eccentric displacement.
2. The invention according to claim 1 in which the torsion spring comprises a pair of oppositely wound coils connected together by a rearwardly extending connecting portion and the spring support pad being divided into two spaced-apart sections forming a passageway through which connecting portion extends, each section supporting one of said coils.

Claims (2)

1. A chair control having: a. a first nontiltable frame mountable on a chair base; b. a second tiltable frame member; c. a helical torsion spring operatively connected to the frame members to resist relative movement of the frame members in one direction; d. a hinge pin pivotally connecting the frame members together for relative pivotal movement, said pin extending axially through the torsion spring; and e. a spring support pad mounted on the first frame underneath the torsion spring, said pad having its upper surface concaved to receive therein adjacent portions of the spring in free slidable relationship whereby the forces generated by the torsionally loaded spring are carried solely on said support member and the spring is restrained against eccentric displacement.
2. The invention according to claim 1 in which the torsion spring comprises a pair of oppositely wound coils connected together by a rearwardly extending connecting portion and the spring support pad being divided into two spaced-apart sections forming a passageway through which connecting portion extends, each section supporting one of said coils.
US870319A 1969-09-23 1969-11-25 Chair control with support for the torsion spring Expired - Lifetime US3601444A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA62731 1969-09-23
GB47186/69A GB1256388A (en) 1969-09-23 1969-09-25 Improvements in or relating to chairs
NL6914969.A NL155445B (en) 1969-09-23 1969-10-03 Chair.
FR6935244A FR2064690A5 (en) 1969-09-23 1969-10-15
DE19691957493 DE1957493B2 (en) 1969-09-23 1969-11-15 Tipping device for office chair rests or seats - with screw, spring fitted as part of support holding back rest under tension

Publications (1)

Publication Number Publication Date
US3601444A true US3601444A (en) 1971-08-24

Family

ID=50680227

Family Applications (1)

Application Number Title Priority Date Filing Date
US870319A Expired - Lifetime US3601444A (en) 1969-09-23 1969-11-25 Chair control with support for the torsion spring

Country Status (6)

Country Link
US (1) US3601444A (en)
CA (1) CA869337A (en)
DE (1) DE1957493B2 (en)
FR (1) FR2064690A5 (en)
GB (1) GB1256388A (en)
NL (1) NL155445B (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709535A (en) * 1971-01-18 1973-01-09 H Rothermel Hinge iron for posture chair
US3813073A (en) * 1972-04-21 1974-05-28 Steelcase Inc Dual torsion bar chair control
US4067610A (en) * 1976-05-10 1978-01-10 Hoover Ball And Bearing Co. Chair control mechanism
US4101166A (en) * 1977-07-07 1978-07-18 Gf Business Equipment, Inc. Chair control mechanism
US5114211A (en) * 1989-09-12 1992-05-19 Simon Desanta Chair, in particular an office chair
US5452937A (en) * 1992-03-09 1995-09-26 Pro-Cord S.R.L. Plate for connecting the seat, back and legs, especially for chairs
US5630649A (en) * 1995-02-17 1997-05-20 Steelcase Inc. Modular chair construction and method of assembly
US5951109A (en) * 1997-04-30 1999-09-14 Haworth, Inc. Chairback with side torsional movement
US6059363A (en) * 1997-04-30 2000-05-09 Haworth, Inc. Chairback with side torsional movement
US6220664B1 (en) * 1999-08-26 2001-04-24 Ming-Hao Lee Base structure for chair seat
US6659554B2 (en) * 2002-02-01 2003-12-09 Wen-Fa Su Adjustment device of a chair backrest
US7614697B1 (en) * 2008-06-06 2009-11-10 Fon Chin Industrial Co., Ltd. Coupling mechanism interposed between a seat and a back of a chair to prevent a reclining motion of the back from tilting the seat
US20120068509A1 (en) * 2010-09-21 2012-03-22 Yun-Chien Hsiao Chair assembly with a backrest-adjusting device
US9241573B1 (en) * 2014-10-22 2016-01-26 Zhongshan Shi Songlin Furniture Co., Ltd. Resilient-support adjusting device of chair backrest

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7501178U (en) * 1974-01-18 1976-06-10 Fritz Kerstholt
US4183581A (en) * 1978-03-06 1980-01-15 Steelcase Inc. Posture iron with safety stop
DE3139448C2 (en) * 1981-10-03 1984-06-07 Kusch & Co Sitzmoebelwerke Kg, 5789 Hallenberg, De
GB2142231A (en) * 1983-06-28 1985-01-16 Parker & Co A A forward tilting chair
EP0208695B1 (en) * 1985-01-12 1989-08-02 Rolf Völkle Seating device with spring for the seat
DE3619312C1 (en) * 1986-06-07 1988-01-14 Kusch Co Sitzmoebel Rocker mechanism for seating
DE8627647U1 (en) * 1986-10-16 1988-09-01 Dauphin F W Buerositzmoebel
EP0271600B1 (en) * 1986-12-19 1991-11-27 C.O.M. Cooperativa Operai Mobilieri S.C.R.L. An adjustable chair
AT393783B (en) * 1989-10-18 1991-12-10 Zuend & Co Ag K Armchair
US5029940A (en) * 1990-01-16 1991-07-09 Westinghouse Electric Corporation Chair tilt and chair height control apparatus
DE4033907C1 (en) * 1990-10-25 1992-05-07 Martin Stoll Gmbh, 7890 Waldshut-Tiengen, De
CA2089694A1 (en) * 1992-07-23 1994-01-24 Faultless-Doerner Manufacturing Inc. Unitary spring for biasing a chair seat back support mechanism against a seat tilt mechanism
US5356200A (en) * 1992-10-23 1994-10-18 Doerner Products Ltd. Unitary brake for a chair tilt mechanism
WO2007087817A1 (en) * 2006-01-12 2007-08-09 Bock 1 Gmbh & Co. Kg Permanent-contact mechanism
NO324513B1 (en) * 2006-03-02 2007-11-05 Jurek Buchacz Rocker spring mechanism for a chair, especially an office or work chair

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202630A (en) * 1938-05-23 1940-05-28 Mary Hauber Chair
US3339973A (en) * 1966-01-05 1967-09-05 Doerner Products Co Ltd Torsion spring chair control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202630A (en) * 1938-05-23 1940-05-28 Mary Hauber Chair
US3339973A (en) * 1966-01-05 1967-09-05 Doerner Products Co Ltd Torsion spring chair control

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709535A (en) * 1971-01-18 1973-01-09 H Rothermel Hinge iron for posture chair
US3813073A (en) * 1972-04-21 1974-05-28 Steelcase Inc Dual torsion bar chair control
US4067610A (en) * 1976-05-10 1978-01-10 Hoover Ball And Bearing Co. Chair control mechanism
US4101166A (en) * 1977-07-07 1978-07-18 Gf Business Equipment, Inc. Chair control mechanism
US5114211A (en) * 1989-09-12 1992-05-19 Simon Desanta Chair, in particular an office chair
US5452937A (en) * 1992-03-09 1995-09-26 Pro-Cord S.R.L. Plate for connecting the seat, back and legs, especially for chairs
US5979988A (en) * 1995-02-17 1999-11-09 Steelcase Development Inc. Modular chair construction and method of assembly
US5630649A (en) * 1995-02-17 1997-05-20 Steelcase Inc. Modular chair construction and method of assembly
US5630647A (en) * 1995-02-17 1997-05-20 Steelcase Inc. Tension adjustment mechanism for chairs
US5782536A (en) * 1995-02-17 1998-07-21 Steelcase Inc. Modular chair construction and method of assembly
US5873634A (en) * 1995-02-17 1999-02-23 Steelcase Inc. Modular chair construction and method of assembly
US5951109A (en) * 1997-04-30 1999-09-14 Haworth, Inc. Chairback with side torsional movement
US6059363A (en) * 1997-04-30 2000-05-09 Haworth, Inc. Chairback with side torsional movement
US6220664B1 (en) * 1999-08-26 2001-04-24 Ming-Hao Lee Base structure for chair seat
US6659554B2 (en) * 2002-02-01 2003-12-09 Wen-Fa Su Adjustment device of a chair backrest
US7614697B1 (en) * 2008-06-06 2009-11-10 Fon Chin Industrial Co., Ltd. Coupling mechanism interposed between a seat and a back of a chair to prevent a reclining motion of the back from tilting the seat
US20120068509A1 (en) * 2010-09-21 2012-03-22 Yun-Chien Hsiao Chair assembly with a backrest-adjusting device
US8348341B2 (en) * 2010-09-21 2013-01-08 Yun-Chien Hsiao Chair assembly with a backrest-adjusting device
US9241573B1 (en) * 2014-10-22 2016-01-26 Zhongshan Shi Songlin Furniture Co., Ltd. Resilient-support adjusting device of chair backrest

Also Published As

Publication number Publication date
NL155445B (en) 1978-01-16
DE1957493B2 (en) 1977-03-31
DE1957493A1 (en) 1971-05-27
FR2064690A5 (en) 1971-07-23
NL6914969A (en) 1971-04-06
CA869337A (en) 1971-04-27
GB1256388A (en) 1971-12-08

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