WO2007100260A1 - Tilting spring mechanism for a chair, especially an office- or working chair - Google Patents

Tilting spring mechanism for a chair, especially an office- or working chair Download PDF

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Publication number
WO2007100260A1
WO2007100260A1 PCT/NO2007/000085 NO2007000085W WO2007100260A1 WO 2007100260 A1 WO2007100260 A1 WO 2007100260A1 NO 2007000085 W NO2007000085 W NO 2007000085W WO 2007100260 A1 WO2007100260 A1 WO 2007100260A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
chair
parts
transversal
rocking
Prior art date
Application number
PCT/NO2007/000085
Other languages
French (fr)
Inventor
Jurek Buchacz
Original Assignee
Jurek Buchacz
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 Jurek Buchacz filed Critical Jurek Buchacz
Publication of WO2007100260A1 publication Critical patent/WO2007100260A1/en

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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
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A47C1/03279—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs of torsion type
    • 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
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest

Definitions

  • Tilting spring mechanism for a chair especially an office- or working chair
  • the invention relates to a rocking swing mechanism for a chair, particularly an office or a working chair where the mechanism is provided between a stem part and movable part of the chair that can be tilted about one transversal tilting axe in the stem part, the mechanism is comprises of a torsion spring providing an increasing gripping of rocking of the movable part of the chair.
  • a rocking spring mechanism of this type is for e.g. known from the Norwegian Patent Application No. 1992 0470.
  • This known mechanism comprises a torsion spring arrangement connected between the chairs foot or stem part and the seat part of the chair, the seat part being tillable about transversal tilting axes and by an increasing tilting angle causing an increasing resilience of the spring.
  • the spring has side parts in the form of a so-called torsion shaft pivotal mounted in supporting parts connected to the seat part.
  • the spring has front torsion parts connected to a torsion device for adjusting the pretension in the spring and a rear part being connected to a pivotal supported intermediate part which extend towards the rear, to which the back part of the chair is fastened.
  • the reconnecting part of the torsion spring is connected to the intermediate part via an articulated joint. To obtain synchronized movement of the back part in relation to the seat part by the rocking movement of the seat part.
  • the bias of the torsion spring may, as mentioned above, be adjusted by means of mentioned tension bias; however, the spring characteristic is not adjustable.
  • the object of the present invention is to provide a rocking spring mechanism which makes possible both an adjustment of the spring bias and the spring characteristic, the mechanism at the same time having a simple and robust construction.
  • rocking spring mechanism of the initially mentioned type which according to this invention is characterised by that the torsion spring mainly is square formed and comprises of two longitudinal side parts and two front transversal parts facing each other, the transversal parts and pieces rest on an abutment device on a back part of the chair, so that the torsion spring can be tensioned according to the tilting angle of the back part and where the side parts are actually movable supported in the stem part transversal to the rocking shaft, so that the distance between the rocking shaft and the torsion springs transversal parts can be changed by the moment of the spring and adjust the spring characteristics.
  • the torsion spring mainly is square formed and comprises of two longitudinal side parts and two front transversal parts facing each other, the transversal parts and pieces rest on an abutment device on a back part of the chair, so that the torsion spring can be tensioned according to the tilting angle of the back part and where the side parts are actually movable supported in the stem part transversal to the rocking shaft, so that
  • An advantageous embodiment of this invention is characterised by the abutment device for the transversal parts and pieces having an abutment piece sloping upwards in a direction away from the rocking shaft in order to increase bias of the torsion spring by increasing the distance between the rocking shaft and the torsion springs front transversal parts.
  • the mechanism according to this invention is designed for use in a chair having a fixed seat part and a movable back part.
  • the spring is movable mounted in the chairs stem part in order to adjust the spring characteristic, but is permanent in relation to the stem part and the seat by tilting the back part.
  • a progressive spring is thus achieved and a uniform or soft changing power due to the movement of the users gravity/weight on the seat.
  • Fig. 1 shows a view in perspective of a rocking spring mechanism according to the invention mounted in connection with a stem part of a chair
  • Fig. 2-4 show a side view, front view and a view from the under side of the rocking spring mechanism of Fig. 1 , respectively, and
  • Fig. 5-8 further show similar view as Fig. 4, but with the torsion spring in another functional position.
  • the stem part is in its central region provided with a hole 3 for mounting to a chair column (not shown) which as usual can be height adjustable by means of conventional gas spring.
  • the back part is pivotably mounted about supporting points in the stem part 1, so that it can be tilted about a transversal rocking shaft AA under influence of a torsion spring 4.
  • the torsion spring 4 is mainly a ring formed or square formed body by a rod of springs of preferably round cross section.
  • the spring 4 comprises two longitudinal side parts 4a, 4b, two forward facing transversal parts 4c, 4d and a rear transversal part 4e connecting the side parts 4a, 4b.
  • the end pieces 5 of the forward transversal parts 4c, 4d rest against an abutment arrangement on the back part 2 by its forward end so that the torsion spring 4 is tensioned depending of the back parts tilting angle.
  • the abutment arrangement consists of two rod parts 6, 7 with a round cross section which extend transverse of the spring transversal parts 4c, 4d and is supported by a sloping plate part 8 of the back part 2.
  • the abutment arrangement has thus an abutment part sloping in the directional away from the rocking shaft and the forward transversal parts 4c, 4d of the torsion springs.
  • abutment arrangement consists of rod parts we a round cross section, a stable abutment point will be achieved between the rod parts and the transversal parts of the spring and thus an even relative change of movement and uniform changing of the spring tension by tilting the back part of a chair.
  • the side parts 4a, 4b of the torsion spring are rotating and axially slidingly supported in their respective groove parts 9 and 10 which are suitably fixed to the under side of the stem part 1 and runs transversely of the shaft A-A in a mainly horizontal plan.
  • the rotary support allows for the turning of the springs side parts by varying the tension of the spring the chair is in use. Since the side parts of the spring also are axially movably supported, the distance between these rocking shaft A-A and the transversal parts 4c, 4d of the spring can be changed by a sliding spring in the channel parts 9, 10 for thus to adjust the spring characteristic and set the tension of the spring individually according to the weight of the actually use of the chair.
  • an operating device is provided, which in the shown embodiment comprises an operating lever 11 which is pivotally supported in the stem part 1 and is operative connected to the torsion spring 4 via a rotary joint 12 and a connecting rod 13 connected to the spring so the spring can be offset by manually turning of the operating lever.
  • the operating lever is carried through a suitable hole (not shown) in the channel part 9 and is axially fixed in this at the same time as it can be turned about its longitudinal axes. Further the operating lever is connected to the rotary joint 12 via a thread connection (not shown), so that the rotary joint by turning the operating lever can be turned between the two outer positions shown in fig. 4 and 8 respectively. Said thread connection has rather coarse threads so that the rotary joint can be rotated between the outer positions by relatively few turnings of the operating lever.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Springs (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)

Abstract

A rocking spring mechanism for a chair wherein the mechanism is provided between a stem part (1) and a movable part (2) of the chair which can be tilted about one in the stem part (1) located, transversal rocking shaft (A-A), where the mechanism comprising a torsion spring (4) providing an increasing tension by an increasing tilting of the movable part of the chair. The torsion spring (4) is mainly square formed and comprises two longitudinal side parts (4a, 4b) and two against each other facing, forward transversal parts (4c, 4d), where the transversal parts and pieces (5) resting on an abutment device (6, 7) on the back part (2) of the chair, so that the torsion spring is tensioned depending of the tilting angle of the back part. The side parts (4a, 4b) are further rotary and actually slidably supported in the stem part (1) transversal of the rocking shaft (A-A), so that the distance between the rocking shaft and the transversal parts (4c, 4d) of the torsion spring (4) can be changed by displacement of the spring and adjust the spring characteristic.

Description

Tilting spring mechanism for a chair, especially an office- or working chair
The invention relates to a rocking swing mechanism for a chair, particularly an office or a working chair where the mechanism is provided between a stem part and movable part of the chair that can be tilted about one transversal tilting axe in the stem part, the mechanism is comprises of a torsion spring providing an increasing gripping of rocking of the movable part of the chair.
A rocking spring mechanism of this type is for e.g. known from the Norwegian Patent Application No. 1992 0470. This known mechanism comprises a torsion spring arrangement connected between the chairs foot or stem part and the seat part of the chair, the seat part being tillable about transversal tilting axes and by an increasing tilting angle causing an increasing resilience of the spring. The spring has side parts in the form of a so-called torsion shaft pivotal mounted in supporting parts connected to the seat part. Further, the spring has front torsion parts connected to a torsion device for adjusting the pretension in the spring and a rear part being connected to a pivotal supported intermediate part which extend towards the rear, to which the back part of the chair is fastened. The reconnecting part of the torsion spring is connected to the intermediate part via an articulated joint. To obtain synchronized movement of the back part in relation to the seat part by the rocking movement of the seat part.
The bias of the torsion spring may, as mentioned above, be adjusted by means of mentioned tension bias; however, the spring characteristic is not adjustable.
The object of the present invention is to provide a rocking spring mechanism which makes possible both an adjustment of the spring bias and the spring characteristic, the mechanism at the same time having a simple and robust construction.
De above said objects are achieved by means of rocking spring mechanism of the initially mentioned type, which according to this invention is characterised by that the torsion spring mainly is square formed and comprises of two longitudinal side parts and two front transversal parts facing each other, the transversal parts and pieces rest on an abutment device on a back part of the chair, so that the torsion spring can be tensioned according to the tilting angle of the back part and where the side parts are actually movable supported in the stem part transversal to the rocking shaft, so that the distance between the rocking shaft and the torsion springs transversal parts can be changed by the moment of the spring and adjust the spring characteristics. An advantageous embodiment of this invention is characterised by the abutment device for the transversal parts and pieces having an abutment piece sloping upwards in a direction away from the rocking shaft in order to increase bias of the torsion spring by increasing the distance between the rocking shaft and the torsion springs front transversal parts. As apposed to the known rocking spring mechanism as mentioned above, the mechanism according to this invention is designed for use in a chair having a fixed seat part and a movable back part. The spring is movable mounted in the chairs stem part in order to adjust the spring characteristic, but is permanent in relation to the stem part and the seat by tilting the back part. A progressive spring is thus achieved and a uniform or soft changing power due to the movement of the users gravity/weight on the seat.
The invention will be described further by means of an exemplary embodiment and the drawings, where Fig. 1 shows a view in perspective of a rocking spring mechanism according to the invention mounted in connection with a stem part of a chair,
Fig. 2-4 show a side view, front view and a view from the under side of the rocking spring mechanism of Fig. 1 , respectively, and
Fig. 5-8 further show similar view as Fig. 4, but with the torsion spring in another functional position.
As it appears from the drawings, these show only elements of a chair in which a rocking spring mechanism according to the invention has been mounted. The figures show an office or a working chair in which a rocking spring mechanism is mounted to work between the fixed stem part 1 and a movable back part 2 of the chair. A seat part (not shown) is fixed mounted to the stem part 1.
The stem part is in its central region provided with a hole 3 for mounting to a chair column (not shown) which as usual can be height adjustable by means of conventional gas spring.
Only the lower part 2 of the chair's back part is shown. The real back supporting part which is not shown will be securely fasten to the back part 2 at it's rear end. The back part is pivotably mounted about supporting points in the stem part 1, so that it can be tilted about a transversal rocking shaft AA under influence of a torsion spring 4.
The torsion spring 4 is mainly a ring formed or square formed body by a rod of springs of preferably round cross section. The spring 4 comprises two longitudinal side parts 4a, 4b, two forward facing transversal parts 4c, 4d and a rear transversal part 4e connecting the side parts 4a, 4b.
As shown the end pieces 5 of the forward transversal parts 4c, 4d rest against an abutment arrangement on the back part 2 by its forward end so that the torsion spring 4 is tensioned depending of the back parts tilting angle. In the shown embodiment the abutment arrangement consists of two rod parts 6, 7 with a round cross section which extend transverse of the spring transversal parts 4c, 4d and is supported by a sloping plate part 8 of the back part 2. The abutment arrangement has thus an abutment part sloping in the directional away from the rocking shaft and the forward transversal parts 4c, 4d of the torsion springs.
Since the abutment arrangement consists of rod parts we a round cross section, a stable abutment point will be achieved between the rod parts and the transversal parts of the spring and thus an even relative change of movement and uniform changing of the spring tension by tilting the back part of a chair.
The side parts 4a, 4b of the torsion spring are rotating and axially slidingly supported in their respective groove parts 9 and 10 which are suitably fixed to the under side of the stem part 1 and runs transversely of the shaft A-A in a mainly horizontal plan. The rotary support allows for the turning of the springs side parts by varying the tension of the spring the chair is in use. Since the side parts of the spring also are axially movably supported, the distance between these rocking shaft A-A and the transversal parts 4c, 4d of the spring can be changed by a sliding spring in the channel parts 9, 10 for thus to adjust the spring characteristic and set the tension of the spring individually according to the weight of the actually use of the chair.
Once the spring is suitably set according to the rocking shaft A-A, it will be fixed in relation to the stem part by use of the chair.
As would appear from the drawings the rocking spring mechanism in fig. 1-4 is shown in a first functional position while it in fig. 5-8 is shown in another functional torsion where the torsion spring is offset in the stem part causing a larger distance between the chair's rocking shaft A-A and the forward transversal parts 4c, 4d of the torsion spring. In order to obtain the desired adjustment of the offset position of the torsion spring, an operating device is provided, which in the shown embodiment comprises an operating lever 11 which is pivotally supported in the stem part 1 and is operative connected to the torsion spring 4 via a rotary joint 12 and a connecting rod 13 connected to the spring so the spring can be offset by manually turning of the operating lever. The operating lever is carried through a suitable hole (not shown) in the channel part 9 and is axially fixed in this at the same time as it can be turned about its longitudinal axes. Further the operating lever is connected to the rotary joint 12 via a thread connection (not shown), so that the rotary joint by turning the operating lever can be turned between the two outer positions shown in fig. 4 and 8 respectively. Said thread connection has rather coarse threads so that the rotary joint can be rotated between the outer positions by relatively few turnings of the operating lever.

Claims

P a t e n t c l a i m s
1. Rocking spring mechanism for a chair, particularly an office or working chair, where the mechanism is provided between a stem part (1) and a movable (2) of the chair which can be tilted about one in the stem part (1) located, transversal rocking shaft (A-A), the mechanism comprising a torsion spring (4) which produces an increasing intension by an increasing tilting of the movable part of the chair, characterised in that the torsion spring (4) mainly is squarely formed and comprises two longitudinal side parts (4a, 4b) and two facing, forward transversal parts (4c, 4d), the transversal parts and pieces (5) are resting on an abutment device (6, 7) on a back part (2) of the chair, so that the torsion spring is tensioned depending of the back parts tilting angle and the side parts (4a, 4b) are actually slidably supported in the stem parts (1) transversal of the rocking shaft (A-A), so that the distance between the rocking shaft and the transversal parts (4c, 4d) of the torsion spring (4) can be changed by sliding of the spring for thus to adjust the spring characteristic.
2. Rocking spring mechanism according to claim 1, characterised in that the abutment device for the end pieces (5) of the transversal parts (4c, 4d) have an abutment part (6, 7) sloping upwards in the direction away from the rocking shaft (A- A) in order to increase the bias of the torsion spring (7) by increase the distance between the rocking shaft and forward transversal parts of the torsion spring.
3. Rocking spring mechanism according to claim 1 or 2, characterised in that the torsion spring (4) made of the rod with a round crossed section.
4. Rocking spring mechanism according to claim 2 or 3, characterised in that the abutment arrangement consisting of two rod parts (6, 7) with round cross section provided below respective and piece (5) of the transversal parts (4c, 4d) and which is supported by a sloping face (8) of the back part (2) and extends transversal of the transversal parts.
5. Rocking spring mechanism according to one of the previous claims, characterised in that the torsion spring (4) is supported in the stem part (1) in a mainly horizontal plan and is fixed in relation to the stem part by use of the chair.
6. Rocking spring mechanism according to one of the previous claims, characterised in that the seat part of the chair is fixed mounted on the stem part (1).
7. Rocking spring mechanism according to one of the previous claims, characterised in that its comprising an operating device for adjusting the offset position of the torsion spring in stem part, the device comprising operating the lever (11) which is rotary supported in the stem part (1) and via a thread connection connected to a rotary joint (12) operatively connected to the spring (4) and performed by a shifting of this by turning the operating lever.
PCT/NO2007/000085 2006-03-02 2007-03-01 Tilting spring mechanism for a chair, especially an office- or working chair WO2007100260A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20061035 2006-03-02
NO20061035A NO324513B1 (en) 2006-03-02 2006-03-02 Rocker mechanism for a chair, especially an office or work chair

Publications (1)

Publication Number Publication Date
WO2007100260A1 true WO2007100260A1 (en) 2007-09-07

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PCT/NO2007/000085 WO2007100260A1 (en) 2006-03-02 2007-03-01 Tilting spring mechanism for a chair, especially an office- or working chair

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NO (1) NO324513B1 (en)
WO (1) WO2007100260A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813073A (en) * 1972-04-21 1974-05-28 Steelcase Inc Dual torsion bar chair control
US3868144A (en) * 1972-05-31 1975-02-25 Finn Lie Spring mechanism for a tiltable member of a tilting chair
US4779925A (en) * 1986-05-15 1988-10-25 Eberhard Heinzel Height-adjustable swivel chair equipped with gas-pressure spring, especially office chair or office armchair
US4865384A (en) * 1987-12-08 1989-09-12 Haworth, Inc. Chair with seat biasing means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA869337A (en) * 1969-09-23 1971-04-27 Doerner Products Co. Limited Chair control with support for the torsion spring
FI910570A (en) * 1991-02-06 1992-08-07 Martela Ag FJAEDRAD GUNGMEKANISM FOER STOL, SPECIELLT ARBETSSTOL.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813073A (en) * 1972-04-21 1974-05-28 Steelcase Inc Dual torsion bar chair control
US3868144A (en) * 1972-05-31 1975-02-25 Finn Lie Spring mechanism for a tiltable member of a tilting chair
US4779925A (en) * 1986-05-15 1988-10-25 Eberhard Heinzel Height-adjustable swivel chair equipped with gas-pressure spring, especially office chair or office armchair
US4865384A (en) * 1987-12-08 1989-09-12 Haworth, Inc. Chair with seat biasing means

Also Published As

Publication number Publication date
NO324513B1 (en) 2007-11-05
NO20061035L (en) 2007-09-03

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