EP0793929A1 - Verstellbarer Bürostuhl - Google Patents

Verstellbarer Bürostuhl Download PDF

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Publication number
EP0793929A1
EP0793929A1 EP97200574A EP97200574A EP0793929A1 EP 0793929 A1 EP0793929 A1 EP 0793929A1 EP 97200574 A EP97200574 A EP 97200574A EP 97200574 A EP97200574 A EP 97200574A EP 0793929 A1 EP0793929 A1 EP 0793929A1
Authority
EP
European Patent Office
Prior art keywords
chair
seat
seat part
tilting
gas spring
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.)
Granted
Application number
EP97200574A
Other languages
English (en)
French (fr)
Other versions
EP0793929B1 (de
Inventor
Maarten Middelkoop
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.)
Rudimec BV
Original Assignee
Rudimec BV
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 Rudimec BV filed Critical Rudimec BV
Publication of EP0793929A1 publication Critical patent/EP0793929A1/de
Application granted granted Critical
Publication of EP0793929B1 publication Critical patent/EP0793929B1/de
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
    • 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
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • 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
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • 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
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs

Definitions

  • a chair in an office can be used for a number of different sedentary activities such as reading and writing with a direction of view of for instance 70° relative to a horizontal working surface, work activity using a monitor and meetings and consultations.
  • sedentary activities are better for feet and knees than standing activities, it is known that sedentary activities can cause back problems.
  • the standing position there is a tendency when sitting for particularly the lower part of the back to curve outward, whereby the so-called lower back muscles (and the buttock muscles) are subjected to prolonged static load, which can result in acidosis in these muscles and thus to pain symptoms.
  • These pain symptoms can result in lack of movement whereby the body no longer provides sufficient of the synovial fluid which serves to lubricate the lower vertebrae and the intervertebral discs.
  • the present invention has for its object to obviate the above mentioned drawbacks and to provide an ergonomically optimal chair.
  • the present invention provides a chair, comprising:
  • the seat together with the chair back is tiltable between a forward angle of inclination in the order of magnitude of 4° relative to the horizontal and a rearward angle of the seat part relative to the horizontal of roughly 15° or 17°
  • the location of the engagement of the tilting means prevents the legs being pinched or the feet leaving the ground during rearward tilting, or the knees colliding with the underside of the table top (at a fixed height of the table top). It is further prevented that the user of the chair has a tendency to slide forward in the forward tilted position; he/she need therefore apply little opposing force with the legs.
  • the chair according to the present invention makes use of a mechanism such that the action of a (usually linear-action) gas spring is converted into a progressive action, whereby the displacement of the centre of gravity of the user is compensated and the user is prevented from tilting further backward than desired. It is also ensured that rearward tilting to a less rearward tilted position will take place smoothly.
  • a mechanism such that the action of a (usually linear-action) gas spring is converted into a progressive action, whereby the displacement of the centre of gravity of the user is compensated and the user is prevented from tilting further backward than desired. It is also ensured that rearward tilting to a less rearward tilted position will take place smoothly.
  • existing chairs which generally make use of a helical spring, wherein rearward tilting often takes place rather abruptly, which is less than desirable from an ergonomic point of view and dangerous for the user.
  • the gas spring is lockable in continuously variable position, for instance in that use is made of a gas spring in which both liquid and oil are present as non-compressible medium.
  • the tilting means comprise weight adjusting means for adjusting the spring force of the gas spring member in accordance with the weight of the user.
  • the invention provides a chair comprising:
  • the chair according to the present invention is preferably provided with arm rest parts which are coupled fixedly to a leg part rotatable on a substantially vertical shaft and which can be adjusted in respect of mutual distance and/or height in accordance with the wishes of the user and the height of the working surface so that the arms of the user remain in position which is ergonomically correct for him/her, also during tilting of the seat and/or chair back, this being particularly important during writing activities and work activity at a keyboard.
  • the chair according to the present invention is provided with adjusting means for adjusting the chair back which pivot at a distance relative to the rear edge of the seat - preferably under the support point for the pelvis - whereby during rearward adjustment of the chair back part the support point on the chair back part is prevented from shifting relative to the (lower) back of the user, with the additional advantage that a shirt is prevented from being pulled upward by the chair back.
  • cushions of the seat and chair back can be easily changed using snap means, which is also advantageous from a production viewpoint, since chairs can easily be supplied with different coloured seats.
  • Control handles for the tilting movement, the adjusting movement of the chair back respectively for the height adjustment are preferably situated at natural positions and on either side of the seat so that a user, even if he is not yet familiar with the chair, can automatically operate the correct control lever on both sides of the chair, which is important for instance while telephoning or during other use of one of both hands.
  • This means that the control lever for the tilting movement is situated visibly on the left and right at the front under the seat, the height adjustment extends in the middle on both sides of the seat and the control lever for adjusting the chair back extends on either side close to the rear of the seat.
  • the weight adjusting means are preferably situated centrally under the seat part.
  • the levers are moreover preferably operable in the same direction in which the adjustment takes place, for instance upwards for height adjustment.
  • the term visual manipulative comfort zone (VMC) is used in ergonomics for control members arranged at correct locations.
  • a chair 1 (fig. 1A, 1B, 1C and 4) comprises an support frame 2 provided with a plurality of wheels 3 which are connected via side legs 4 to a central leg 5 which is height-adjustable using a gas spring and relative to which a seat 6 can rotate.
  • a chair back 7 is connected to seat 6 via arms 8.
  • a pivot shaft 10 is situated at about a third the way along from the front edge of seat 6.
  • Fig. 1A shows the position in which seat 6 and chair back 7 are tilted slightly rearward relative to pivot shaft 10, wherein due to the position of pivot shaft 10 a user is prevented, while retaining a hollow back, from banging his knees against the underside of a work surface or his/her feet leaving the floor.
  • the position shown in fig. 1A is used for instance during consultations and meetings.
  • chair back and seat are tilted less far to the rear than in fig. lA, while the user automatically retains a correct ergonomic posture with hollow back.
  • the position of the tilt of the seat and chair back is determined by the desired viewing direction, i.e roughly 70° relative to the activities to be performed.
  • the desired viewing direction i.e roughly 70° relative to the activities to be performed.
  • the user therefore has the tendency to bend further forward.
  • the seat is tilted forward at a small angle in order to ensure that the user retains a hollow back and wherein the position of pivot shaft 10 prevents an inclination of the seat being reached such that the user will have to provide strong opposing force to prevent him/her sliding forward.
  • the chair is preferably provided with arm rests which are disposed fixedly relative to a rotatable leg part and preferably take a form such that they abut well against a table top T (after being set at the correct height by the user) and which form follows the ergonomically correct position of the elbows during rearward tilting of the seat together with the chair back as well as during forward and rearward adjusting of the chair back relative to the seat.
  • the arched shape follows approximately an arc of a circle relative to pivot shaft 10, wherein a portion abutting the table top is preferably slightly flat in order to properly abut thereagainst. Because the arm rests do not move together with the tilting movement, the fingers of the user are also prevented from possibly being caught between table top and arm rests.
  • a gas spring 11 is arranged between a first pivot point 12 and a second pivot point 13, wherein the second pivot point is arranged on a pivotable arm 14.
  • Gas spring 11 is situated at an acute angle ⁇ relative to the horizontal.
  • Arm 14 is fixedly connected via rotatable sleeve 35 to guide arms 36 and 37 (see also fig. 3, 4 and 5) in which the respective shafts ends 30 and 31 are guided.
  • Shaft ends 30 and 31 protrude through respective slots 32 and 33 of component 34 which is arranged on a sleeve round pivot shaft 10, this sleeve forming part of the seat frame.
  • seat 6 When seat 6 (at least the rear part thereof) is caused to move upward from the position shown in fig. 2A, for instance because the individual stands up, it is pressed upward by gas spring 11 via arm 14 and guide arms 36 and 37. Because in the position shown in fig. 2B shaft ends 30, 31 are situated further from the sleeve 15 than in the position shown in fig. 2A and the direction of the force exerted by the gas spring makes a smaller angle relative to arm 14, the moment applied to seat 6 by gas spring 11 is less in the position shown in fig. 2B than in the position shown in fig. 2A. The angle ⁇ ' in fig. 2B is moreover smaller than angle a.
  • the progressive action of the gas spring is however obtained mainly by the change in lever length of guide arms 36, 37 relative to the fixed length of arm 14.
  • the moment on seat 6 therefore increases progressively during backward tilting of at least the rear portion of seat 6.
  • An even upward movement of seat part 6 thus takes place while during the reverse movement, i.e. backward tilting, an increasing opposing force is exerted.
  • the position of shaft ends 30, 31 is determined by the position of a weight adjusting screw knob 16, wherein in the extreme position shown in fig. 2D the moment applied by gas spring 11 is smaller during tilting and more suitable for a light person than in the extreme position shown in fig. 2C which is more suitable for a heavy person.
  • the gas spring 11 is preferably a gas spring which is lockable in continuously variable manner in any position, wherein use is made of non-compressible medium, for instance a liquid, which is incorporated therein.
  • Fig. 3 further shows that by turning knob 16 shaft ends or rollers 30 respectively 31 can be displaced in the guide arms 36 and 37 which are fixedly coupled to a rotatable sleeve 35 on which the arm 14 on which gas spring 11 engages is also fixedly arranged.
  • one or more rotatable shafts or other components can be provided with needle bearings (or ball bearings).
  • Fig. 4 and 5 show a further gas spring 40 which engages on a pivot shaft 41 on which arms 8 of chair back 7 are pivotally mounted.
  • Handles 42 operate an control mechanism 43 for gas spring 40 and are situated on either side of seat 6 at a natural position for adjusting the chair back 7, i.e. close to outer ends of arms 8.
  • Handles 44 extend roughly in the middle of seat 6 on either side thereunder for operation of a control mechanism 49 of the gas spring (not shown) in central leg 5.
  • Control levers 45 are situated close to the front side of the seat to bring about operation via rod 46 of control mechanisms 47 for the tilting (gas spring 11).
  • both arm rests 20 can be adjusted away from and toward each other, while in a manner not further shown they are both height-adjustable and detachable.
  • the cushions for the seat and the chair back are arranged in a preferred embodiment against a plastic shell part and the cushions can be snapped into place thereon so that different colours can be arranged and for instance a low or high cushion can be arranged for the chair back.
  • the seat cushion for instance can also be displaced for forward and backward adjustment in order to set the so-called sitting depth, while the chair back cushion is preferably likewise movable for height adjustment together with the shell onto which it is snapped in place.
  • the seat cushion must be embodied such that it must be able to follow the positions shown in fig. lA-lC, i.e. either be of soft and flexible material such that the movements imposed by pivot shaft 10 can be followed, or take a divided form with an internal pivotable construction with extremely soft flexible material at the position of the pivot shaft.
  • the arms 8 extend beyond and below the rear edge of the seat, thereby further preventing that during rearward adjustment of the chair back the lower part thereof is displaced relative to the lower part of the back of the user and the correct ergonomic position is preserved and the user does not acquire a tendency to curve his/her back outward.
  • a non-limitative modification relates to a seat of which the front part is movable between a horizontal position and a slightly forward inclined position (up to about 4° relative to the horizontal), while in the above described preferred embodiment, with an eye to cost, the provisional starting point is a fixed, slightly forward inclining front seat part.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Seats For Vehicles (AREA)
  • Vibration Prevention Devices (AREA)
EP97200574A 1996-03-04 1997-02-27 Verstellbarer Bürostuhl Expired - Lifetime EP0793929B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1002523A NL1002523C2 (nl) 1996-03-04 1996-03-04 Kantelbare kantoorstoel.
NL1002523 1996-03-04

Publications (2)

Publication Number Publication Date
EP0793929A1 true EP0793929A1 (de) 1997-09-10
EP0793929B1 EP0793929B1 (de) 2003-06-25

Family

ID=19762436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97200574A Expired - Lifetime EP0793929B1 (de) 1996-03-04 1997-02-27 Verstellbarer Bürostuhl

Country Status (5)

Country Link
EP (1) EP0793929B1 (de)
AT (1) ATE243446T1 (de)
DE (1) DE69722986T2 (de)
DK (1) DK0793929T3 (de)
NL (1) NL1002523C2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1192877A3 (de) * 2000-09-28 2003-05-28 Formway Furniture Limited Neigungsverstellbarer Stuhl
EP1378269A1 (de) * 2002-06-11 2004-01-07 Mario Salvioli Trainingsgerät für die Bauchmuskulatur
NL1025833C2 (nl) 2004-03-26 2005-10-03 Bma Ergonomics B V Stoel met automatische rugleuningshoekinstelling.
WO2024253601A1 (en) * 2023-05-02 2024-12-12 CHAICHANA, Suladda Multi pivot tilting seat support structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263323A2 (de) * 1986-10-07 1988-04-13 Inaba Seisakusho Co., Ltd. Sitzmöbel
EP0309368A1 (de) * 1987-09-22 1989-03-29 Steelcase Strafor Ergonomischer Stuhl
EP0678259A1 (de) * 1994-04-21 1995-10-25 Manufacturas Metalicas Jevit, S.A. Ergonomischer Lehnstuhl mit Schaukelbewegung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263323A2 (de) * 1986-10-07 1988-04-13 Inaba Seisakusho Co., Ltd. Sitzmöbel
EP0309368A1 (de) * 1987-09-22 1989-03-29 Steelcase Strafor Ergonomischer Stuhl
EP0678259A1 (de) * 1994-04-21 1995-10-25 Manufacturas Metalicas Jevit, S.A. Ergonomischer Lehnstuhl mit Schaukelbewegung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1192877A3 (de) * 2000-09-28 2003-05-28 Formway Furniture Limited Neigungsverstellbarer Stuhl
EP1378269A1 (de) * 2002-06-11 2004-01-07 Mario Salvioli Trainingsgerät für die Bauchmuskulatur
NL1025833C2 (nl) 2004-03-26 2005-10-03 Bma Ergonomics B V Stoel met automatische rugleuningshoekinstelling.
WO2024253601A1 (en) * 2023-05-02 2024-12-12 CHAICHANA, Suladda Multi pivot tilting seat support structure

Also Published As

Publication number Publication date
DE69722986D1 (de) 2003-07-31
NL1002523C2 (nl) 1997-09-05
DK0793929T3 (da) 2003-10-13
ATE243446T1 (de) 2003-07-15
EP0793929B1 (de) 2003-06-25
DE69722986T2 (de) 2004-06-09

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