EP0801913A1 - Dossier pour une chaise - Google Patents

Dossier pour une chaise Download PDF

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Publication number
EP0801913A1
EP0801913A1 EP96302640A EP96302640A EP0801913A1 EP 0801913 A1 EP0801913 A1 EP 0801913A1 EP 96302640 A EP96302640 A EP 96302640A EP 96302640 A EP96302640 A EP 96302640A EP 0801913 A1 EP0801913 A1 EP 0801913A1
Authority
EP
European Patent Office
Prior art keywords
track
backrest
chair
carriage
follower element
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.)
Withdrawn
Application number
EP96302640A
Other languages
German (de)
English (en)
Inventor
Benjamin Cowan
Marek Kmicikiewicz
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.)
CKE TECHNOLOGIES Inc
Original Assignee
CKE TECHNOLOGIES Inc
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 CKE TECHNOLOGIES Inc filed Critical CKE TECHNOLOGIES Inc
Priority to EP96302640A priority Critical patent/EP0801913A1/fr
Publication of EP0801913A1 publication Critical patent/EP0801913A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • A47C7/446—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with fluid springs

Definitions

  • the present invention relates to a chair which can shift in response to a person sitting on the chair, the chair also comprising a backrest which pivots about an axis coincident with the H point axis relative to the chair.
  • Another category of chairs for work stations which aims to allow passive forward and rearward movement of the seat in order to follow the attitude of the person leaning forward in a working mode or leaning back in a rest mode, includes the Serber U. S. Patent 4,650,249, issued March 17, 1987, and the Cowan et al U. S. Patent 5,048,893, issued September 17, 1991.
  • an arcuate track is provided at the top of the post and a carriage travels in the track with a seat mounted on the carriage. The arrangement allows the seat to passively adjust itself with the person's body in relation to changes in the center of gravity of the body.
  • Conventional backrests rotate around an axis located below the seat or at the back thereof. Upon tilting of such a backrest, the movement of the dorsal support member of the backrest is greater than that of the upper part of the body of the user in contact with the dorsal support member.
  • the greater relative movement of this dorsal support member, as compared to that of the upper body of the user, is a disadvantage, since discomfort is produced from that friction. For example, the relative movement of the dorsal support member tends to pull out the shirt tail tucked inside the pants of the user leaning against the backrest.
  • Patent 5,052,753 as well as the frame members and runners described in U. S. Patent 5,024,484, offer too much friction to permit a smooth operation of the backrest.
  • the backrests taught in these two United States patents are mounted on conventional seats or on seats which also pivot about the H point axis.
  • a chair and backrest assembly is subject of our International Application No. PCT/CA94/00453, filed August 22, 1994.
  • the backrest described herein is an improvement over our earlier backrest.
  • the H point is defined as the pivot center of the torso and thigh [Society of Automotive Engineers (SAE) Handbook, 1986, p. 34.55]. As seen in Fig. 1 of the SAE Handbook (p. 34.33), the H point is defined as the point of intersection of the torso line and the hip axis. It is important to note that, while anatomical characteristics such as lower leg segment or thigh segment can vary significantly according to the user, the H point remains relatively constant. Thus, by taking into account parameters such as the cushion compression of the seat upon proper sitting of the user, and the buttocks segment of the majority of users (for example, the 95th percentile), the definition and location of the H point of the majority of users can be accurately predicted. From this H point, an H point relative to the chair can be positively located on the chair.
  • a backrest for a chair whereby the backrest will tilt rearwardly and downwardly in response to a rearward shift in the weight of a person sitting on the chair, the tilt of the backrest following a rotational movement about an axis essentially coincident with the H point relative to the chair, the chair including support means, the backrest having mounting means, a track fixedly connected to the mounting means, the tack defining a circular arcuate segment having a radial center essentially coincident with the H point relative to the chair, a follower element having a first and a second end, the first end being mounted to a dorsal support member, the second end being slidable on the track, low friction sliding means provided between the second end and the track, whereby the backrest will tilt rearwardly and downwardly in response to a rearward shift in the weight of a person leaning against the dorsal support member; the backrest further comprising resilient means extending between the follower element and the
  • FIG. 1 A preferred embodiment of a backrest 302, adapted to be mounted on a chair 310 is illustrated.
  • the chair 310 includes a support 304, and a seat 116 mounted thereon.
  • the backrest 302 also includes a mounting member 306 adapted to be mounted on the support 304.
  • an embodiment of the mounting member 306 is shown as including fasteners 308 securing the mounting member 306 of the backrest 302 to the seat pan 122.
  • the backrest 302 also includes a track member 318 fixedly mounted to the mounting member 306 and into which the follower element 320 slides.
  • the follower element 320 is welded or otherwise fixed to a low friction device, such as ball bearings 323.
  • the follower element 320 is fixedly mounted at its top end to a vertical adjustment device 325 for the dorsal support member 327.
  • the vertical adjustment device 325 permits a lowering or a raising of same in relation with the height or desire of the user.
  • the track member 318 includes a housing 329 comprising two end walls 331 and 333, a bottom wall 335, a top wall 337, and side walls 339 (339a representing the right-hand side wall), as best exemplified in Figs. 1, 2, and 5.
  • the end wall 331 of the housing 329 is provided with an opening 341 through which the follower element 320 can pass.
  • the track member 318 defines a segment of a circular arc having a radial center essentially coincident with the H point of the chair.
  • the follower element 320 is provided with ball bearing members 323 mounted on a shaft 343, the shaft 343 being welded or otherwise fixed to the follower element 320.
  • the side walls 339 of the housing 329 can also include a Teflon (a trade-mark of E. I. duPont de Nemours) strip 345 which reduces the friction between the ball bearing member 323 and the adjacent side wall 339.
  • the follower element follows a circular path which also has a radial center essentially coincident with the H point relative to the chair.
  • the top portion 347 of the follower element 320 rotatably mounts an air cylinder 349 through a bracket 351 or other mounting member.
  • the air cylinder 349 also includes a piston 353 rotatably mounted on a carriage 355.
  • the carriage 355 is provided with a side wall 357, a top wall 359, and a bottom wall 361, thereby encasing the housing 329.
  • the top wall 361 of the carriage 355 is provided with a channel-shaped recess 363 with side walls 365, the side walls 365 of the recess 363 rotatably mounting the piston 353 by way of fasteners 367.
  • the carriage 355 is adapted to slide on the housing 329 by means of a knob 369 mounting a bolt 371 which is threaded and passes through a threaded bore 373 in a yoke member 375.
  • the yoke member 375 also comprises legs 377 which are mounted on the top wall 361 of the carriage 355 by way of fasteners 379.
  • the end of the threaded bolt 371, opposite the knob 369, is provided with a retaining member 381, such that a clockwise movement of the knob 369 translates into the yoke member moving in a rearward direction, thereby dragging along the carriage 355 between the position shown in full lines in Figs. 1 and 4 and the position shown in dotted lines in the same Figs.
  • These two positions represent the extreme of the adjustment of the carriage 355 and, therefore, of the air cylinder 349 (also shown in full and dotted lines in Fig. 1).
  • a person using the chair will assume a sitting, working position. In such a position, the person is upright or leaning forward over a work table.
  • the air cylinder 349 should be sufficient to maintain the backrest in its uppermost position, and thus the follower element 320 will be in its uppermost position as shown in Fig. 1.
  • the backrest is adjusted for a lighter person.
  • the air cylinder 349 because of its resistance, maintains the backrest erect.
  • the resistance of the air cylinder 349 is overcome by the action moment and the backrest 302 will move downwardly, the follower element 347 moving downwardly along the arcuate path traced by the track 318.
  • the sliding movement of the follower element 320 in the track 318 is in a circular arc with the center H at the hip point relative to the chair.
  • the downward movement of the backrest 302 results in a compression of the cylinder 349, as shown in Fig. 2.
  • the air cylinder 349 will extend to move the follower element 320 along with the dorsal support member 327 to its original upright position as shown in Fig. 1 in full lines and in dotted lines in Fig. 2.
  • Fig. 2, and Fig. 1 in solid lines show the backrest 302 adapted for a lighter person.
  • the knob 369 is rotated so as to move the carriage 355 towards the extreme position shown in dotted lines in Fig. 1 or an intermediate position therebetween.
  • the cylinder 349 will thus be pre-compressed relative to its position shown in full lines in Fig. 1, thereby increasing the resistance to the downward movement of the follower element 320 along the track 318.
  • the air cylinder 349 can be adjusted to provide equilibrium for heavier persons using the chair by merely adjusting the knob 369. Thereafter, the operation is the same as previously described.

Landscapes

  • Chairs Characterized By Structure (AREA)
EP96302640A 1996-04-16 1996-04-16 Dossier pour une chaise Withdrawn EP0801913A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96302640A EP0801913A1 (fr) 1996-04-16 1996-04-16 Dossier pour une chaise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96302640A EP0801913A1 (fr) 1996-04-16 1996-04-16 Dossier pour une chaise

Publications (1)

Publication Number Publication Date
EP0801913A1 true EP0801913A1 (fr) 1997-10-22

Family

ID=8224891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96302640A Withdrawn EP0801913A1 (fr) 1996-04-16 1996-04-16 Dossier pour une chaise

Country Status (1)

Country Link
EP (1) EP0801913A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340746A (en) * 1998-07-27 2000-03-01 Ashfield Eng Co Wexford Ltd Posture-responsive chair
US6637072B2 (en) 2000-09-29 2003-10-28 Formway Furniture Limited Castored base for an office chair
US6802566B2 (en) 2000-09-28 2004-10-12 Formway Furniture Limited Arm assembly for a chair
WO2010068122A1 (fr) * 2008-12-12 2010-06-17 Formway Furniture Limited Chaise, support et composants
GB2450199B (en) * 2007-04-26 2012-10-17 Integrated Furniture Technologies Ltd Adjustable furniture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH663526A5 (en) * 1984-05-16 1987-12-31 Provenda Marketing Ag Chair
EP0517934A1 (fr) * 1991-06-10 1992-12-16 Siemens Aktiengesellschaft Chaîne dentaire avec dossier basculant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH663526A5 (en) * 1984-05-16 1987-12-31 Provenda Marketing Ag Chair
EP0517934A1 (fr) * 1991-06-10 1992-12-16 Siemens Aktiengesellschaft Chaîne dentaire avec dossier basculant

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2340746A (en) * 1998-07-27 2000-03-01 Ashfield Eng Co Wexford Ltd Posture-responsive chair
GB2340746B (en) * 1998-07-27 2002-02-13 Ashfield Eng Co Wexford Ltd A chair
US6422649B2 (en) 1998-07-27 2002-07-23 Ashfield Engineering Company Wexford Limited Chair
US6802566B2 (en) 2000-09-28 2004-10-12 Formway Furniture Limited Arm assembly for a chair
US6817667B2 (en) 2000-09-28 2004-11-16 Formway Furniture Limited Reclinable chair
US7798573B2 (en) 2000-09-28 2010-09-21 Formway Furniture Limited Reclinable chair
US6637072B2 (en) 2000-09-29 2003-10-28 Formway Furniture Limited Castored base for an office chair
GB2450199B (en) * 2007-04-26 2012-10-17 Integrated Furniture Technologies Ltd Adjustable furniture
US9474375B2 (en) 2007-04-26 2016-10-25 Integrated Furniture Technologies Limited Adjustable furniture
WO2010068122A1 (fr) * 2008-12-12 2010-06-17 Formway Furniture Limited Chaise, support et composants
US9033421B2 (en) 2008-12-12 2015-05-19 Formway Furniture Limited Chair, a support, and components
US9622579B2 (en) 2008-12-12 2017-04-18 Formway Furniture Limited Chair, a support, and components

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