US20090115235A1 - Piece of Seating Furniture, in Particular Office Chair - Google Patents

Piece of Seating Furniture, in Particular Office Chair Download PDF

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Publication number
US20090115235A1
US20090115235A1 US11/658,190 US65819005A US2009115235A1 US 20090115235 A1 US20090115235 A1 US 20090115235A1 US 65819005 A US65819005 A US 65819005A US 2009115235 A1 US2009115235 A1 US 2009115235A1
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US
United States
Prior art keywords
guide strip
piece
seating furniture
clamping
lumbar support
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.)
Abandoned
Application number
US11/658,190
Inventor
Hermann Bock
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.)
Bock 1 GmbH and Co KG
Original Assignee
Bock 1 GmbH and Co KG
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 Bock 1 GmbH and Co KG filed Critical Bock 1 GmbH and Co KG
Publication of US20090115235A1 publication Critical patent/US20090115235A1/en
Abandoned 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
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A47C7/462—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means

Definitions

  • the present invention relates to a piece of seating furniture, in particular an office chair, having a backrest with lumbar support.
  • the object of the present invention is to improve the comfort and ease of use of a piece of seating furniture. This object is achieved by a piece of seating furniture as claimed in claim 1 .
  • a basic idea of the invention is to arrange the lumbar support in a height-adjustable manner on a flexible guide strip.
  • arranging the lumbar support on a guide strip has the advantage that, on the one hand, it is particularly easy to change the position of the lumbar support.
  • the flexible configuration of the guide strip avoids the situation where the seated individual's back is subjected to too much pressure. In other words, the lumbar support yields to the pressure applied by the seated individual, as a result of which comfort when seated is significantly improved.
  • FIG. 1 shows a side view of a backrest of an office chair with a lumbar support in section
  • FIG. 2 shows a perspective illustration of the lumbar support from FIG. 1 ,
  • FIG. 3 shows a side view of the lumbar support from FIG. 2 with the supporting body in section
  • FIG. 4 shows a perspective view of the backrest from FIG. 1 .
  • the lumbar support 1 essentially comprises a supporting body 2 and a strip holder 3 fastened thereon.
  • the strip holder 3 serves for fixing the lumbar support 1 on a guide strip 4 .
  • FIGS. 1 to 4 depict merely the retaining shell 5 provided for accommodating the actual lumbar cushion.
  • Fastening elements 6 are provided on the retaining shell 5 for the purpose of fixing the lumber cushion.
  • the supporting body On the concave rear side 7 of the supporting body 2 , this rear side being located opposite the subsequent position of the lumbar cushion, the supporting body has two essentially horizontally running and vertically spaced-apart clamping beads 8 .
  • the strip holder 3 On the rear side 7 of the supporting body 2 , the strip holder 3 is fitted in the region of these clamping beads 8 .
  • the strip holder 3 comprises two vertically running lateral guide walls 9 which are connected to one another by a clamping crosspiece 10 .
  • the clamping crosspiece 10 here is spaced apart from the rear side 7 of the supporting body 2 such that the guide strip 4 can be introduced into the strip holder 3 between the two clamping beads 8 , on the one hand, and the clamping crosspiece 10 , on the other hand.
  • the guide strip 4 , clamping beads 8 and clamping crosspiece 10 here are positioned in relation to one another, and dimensioned, such that the guide strip 4 always butts against three points, namely against the clamping beads 8 and the clamping crosspiece 10 .
  • the clamping beads 8 and the clamping crosspiece 10 form a three-point clamping arrangement.
  • the guide strip 4 is produced from a flexible plastic material.
  • the hardness of the plastic material, and thus the flexibility of the guide strip 4 can be adjusted in a variable manner during the production thereof.
  • the guide strip 4 may be designed to be more or less hard or soft, so that, when it is subjected to loading by a seated individual, it yields to a more or less pronounced extent in the direction of pressure 12 .
  • the guide strip 4 is fastened on a backrest 13 of an office chair.
  • the backrest 13 has a central carrier element 14 which, at its bottom end, has mounting elements 15 for fastening on a seat element (not depicted).
  • Two retaining arms 16 extending in the direction of the seat element are fitted on the carrier element 14 .
  • a middle carrier 17 extends from the carrier element 14 in the direction of the seat element, the bottom transverse strut 18 of a frame 19 being fastened as the end of the middle carrier.
  • the bottom transverse strut 18 is connected to a top transverse strut 21 via two lateral struts 20 .
  • the top transverse strut is connected in the middle to the top end 23 of the central carrier element 14 .
  • fastening elements 22 which serve for fastening a backrest material, for example a netting or padding element, on the frame 19 and thus for forming the actual backrest.
  • the guide strip 4 is fastened on the central carrier element 14 of the backrest, between the middle carrier 17 and the top end 23 of the carrier element 14 , at a top fastening point 24 and a bottom fastening point 25 , which is spaced apart from the top fastening point. This secures the horizontal, lateral position of the supporting body 2 . It is located, in accordance with the position of the central carrier element 14 of the backrest, in the middle in relation to a seated individual's back (not depicted).
  • a fixed-point, moveable fastening of the top end of the guide strip 4 on the carrier element 14 is provided at the top fastening point 24 .
  • the top fastening strut 26 which is provided at the top end of the guide strip 4 , is connected in a rotatable manner to a holder 27 fixed on the carrier element 14 .
  • the position of the bottom fastening point 25 of the guide strip 4 can be changed in the vertical direction 11 by an operating mechanism in the manner of a lock.
  • a bottom fastening strut 29 which is arranged at the bottom end of the guide strip 4 , is clamped firmly, with the aid of a clamping jaw 30 , against a clamping rest 31 fitted on the central carrier element 14 .
  • a clamping lever 32 By virtue of a clamping lever 32 being released, this clamping action can be eliminated and the bottom fastening strut 29 can be transferred into one of the further, vertically offset clamping grooves 33 of the clamping rest 31 . It can be clamped there by renewed actuation of the clamping lever 32 .
  • the bottom end of the latter is positioned in a kind of closed guide frame 34 , which prevents the bottom end of the guide strip 4 from being removed from the lock when the clamping lever 32 is released.
  • FIGS. 1 to 3 each show only one of the side parts 38 of the carrier element 14 which bound the recess 35 , while the other side part, including the guide frame and the holder arranged on the side part, is not depicted.
  • the guide strip 4 is subjected to a certain amount of prestressing. This ensures, on the one hand, that the supporting body 2 is secured reliably on the guide strip 4 and, on the other hand, that, when a seated individual applies pressure to the supporting body 2 , a sufficient opposing pressure can be built up.
  • the level of prestressing can be set by changing the spacing between the two fastening points 24 , 25 of the guide strip 4 on the carrier element 14 with the aid of the operating mechanism 28 , and thus by changing the radius of the guide strip 4 .
  • the contact pressure of the supporting body 2 can be adapted individually to the seated individual's requirements by virtue of the prestressing of the guide strip 4 being altered.
  • height adjustment of the supporting body 2 in the vertical direction 11 simultaneously brings about a change in the inclination of the supporting body.
  • a further embodiment of the invention which is not illustrated, provides an undulating profile on the front side and/or rear side of the guide strip 4 such that, during height adjustment of the supporting body 2 , clamping beads 8 and/or clamping crosspiece 10 move along the undulating profile and multi-step adjustment, of which the user is aware, takes place.

Abstract

A piece of seating furniture, in particular an office chair, has a backrest with a lumbar support. In order to improve the comfort and ease of use of such a piece of seating furniture, the lumbar support is disposed in a height-adjustable manner on a flexible guide strip.

Description

  • The present invention relates to a piece of seating furniture, in particular an office chair, having a backrest with lumbar support.
  • The previous designs of lumbar supports fitted on backrests have the disadvantage of a comparatively low level of flexibility. Using lumbar supports consequently often results in uncomfortable pressure being applied to certain points of the seated individual's back. Furthermore, the known lumbar supports can only be adjusted in height over a small adjustment range.
  • The object of the present invention is to improve the comfort and ease of use of a piece of seating furniture. This object is achieved by a piece of seating furniture as claimed in claim 1.
  • A basic idea of the invention is to arrange the lumbar support in a height-adjustable manner on a flexible guide strip. In contrast to those techniques of fastening lumbar supports which are known from the prior art, arranging the lumbar support on a guide strip has the advantage that, on the one hand, it is particularly easy to change the position of the lumbar support. Thus, for example, if the lumbar support is clamped on the guide strip, it can be adjusted in height by straightforward displacement. On the other hand, the flexible configuration of the guide strip avoids the situation where the seated individual's back is subjected to too much pressure. In other words, the lumbar support yields to the pressure applied by the seated individual, as a result of which comfort when seated is significantly improved.
  • Advantageous embodiments of the invention are explained in more detail hereinbelow with reference to an exemplary embodiment and with the aid of the figures, in which:
  • FIG. 1 shows a side view of a backrest of an office chair with a lumbar support in section,
  • FIG. 2 shows a perspective illustration of the lumbar support from FIG. 1,
  • FIG. 3 shows a side view of the lumbar support from FIG. 2 with the supporting body in section, and
  • FIG. 4 shows a perspective view of the backrest from FIG. 1.
    •
  • The lumbar support 1 essentially comprises a supporting body 2 and a strip holder 3 fastened thereon. The strip holder 3 serves for fixing the lumbar support 1 on a guide strip 4. For reasons of clarity, FIGS. 1 to 4, rather than depicting the entire supporting body 1, depict merely the retaining shell 5 provided for accommodating the actual lumbar cushion. Fastening elements 6 are provided on the retaining shell 5 for the purpose of fixing the lumber cushion.
  • On the concave rear side 7 of the supporting body 2, this rear side being located opposite the subsequent position of the lumbar cushion, the supporting body has two essentially horizontally running and vertically spaced-apart clamping beads 8. On the rear side 7 of the supporting body 2, the strip holder 3 is fitted in the region of these clamping beads 8. The strip holder 3 comprises two vertically running lateral guide walls 9 which are connected to one another by a clamping crosspiece 10. The clamping crosspiece 10 here is spaced apart from the rear side 7 of the supporting body 2 such that the guide strip 4 can be introduced into the strip holder 3 between the two clamping beads 8, on the one hand, and the clamping crosspiece 10, on the other hand. The guide strip 4, clamping beads 8 and clamping crosspiece 10 here are positioned in relation to one another, and dimensioned, such that the guide strip 4 always butts against three points, namely against the clamping beads 8 and the clamping crosspiece 10. In other words, the clamping beads 8 and the clamping crosspiece 10 form a three-point clamping arrangement. By virtue of this frictional clamping in the manner of a locking pawl, the lumbar support 1 is retained on the guide strip 4 and can be guided upward or downward on the guide strip 4 by straightforward displacement, this allowing adjustment in the vertical direction 11.
  • The guide strip 4 is produced from a flexible plastic material. The hardness of the plastic material, and thus the flexibility of the guide strip 4, can be adjusted in a variable manner during the production thereof. Depending on customer requirements, or in accordance with the type of padding used for the lumbar cushion, the guide strip 4 may be designed to be more or less hard or soft, so that, when it is subjected to loading by a seated individual, it yields to a more or less pronounced extent in the direction of pressure 12.
  • The guide strip 4 is fastened on a backrest 13 of an office chair. The backrest 13 has a central carrier element 14 which, at its bottom end, has mounting elements 15 for fastening on a seat element (not depicted). Two retaining arms 16 extending in the direction of the seat element are fitted on the carrier element 14. Above the retaining arms 16, a middle carrier 17 extends from the carrier element 14 in the direction of the seat element, the bottom transverse strut 18 of a frame 19 being fastened as the end of the middle carrier. The bottom transverse strut 18 is connected to a top transverse strut 21 via two lateral struts 20. The top transverse strut, in turn, is connected in the middle to the top end 23 of the central carrier element 14.
  • Provided in the frame 19 are fastening elements 22 which serve for fastening a backrest material, for example a netting or padding element, on the frame 19 and thus for forming the actual backrest.
  • The guide strip 4 is fastened on the central carrier element 14 of the backrest, between the middle carrier 17 and the top end 23 of the carrier element 14, at a top fastening point 24 and a bottom fastening point 25, which is spaced apart from the top fastening point. This secures the horizontal, lateral position of the supporting body 2. It is located, in accordance with the position of the central carrier element 14 of the backrest, in the middle in relation to a seated individual's back (not depicted).
  • A fixed-point, moveable fastening of the top end of the guide strip 4 on the carrier element 14 is provided at the top fastening point 24. For this purpose, the top fastening strut 26, which is provided at the top end of the guide strip 4, is connected in a rotatable manner to a holder 27 fixed on the carrier element 14. Conversely, the position of the bottom fastening point 25 of the guide strip 4 can be changed in the vertical direction 11 by an operating mechanism in the manner of a lock. In a fixed position of this lock, a bottom fastening strut 29, which is arranged at the bottom end of the guide strip 4, is clamped firmly, with the aid of a clamping jaw 30, against a clamping rest 31 fitted on the central carrier element 14. By virtue of a clamping lever 32 being released, this clamping action can be eliminated and the bottom fastening strut 29 can be transferred into one of the further, vertically offset clamping grooves 33 of the clamping rest 31. It can be clamped there by renewed actuation of the clamping lever 32. In order to secure the guide strip 4, the bottom end of the latter is positioned in a kind of closed guide frame 34, which prevents the bottom end of the guide strip 4 from being removed from the lock when the clamping lever 32 is released.
  • The clamping lever 32 of the clamping mechanism, for altering the prestressing of the guide strip 4, is arranged in a vertically running recess 35 of the central carrier element 14. In the closed state here, the clamping-lever end 36 projects only minimally, if at all, beyond the rear side 37 of the carrier element 14, so that accidental release of the clamping mechanism is ruled out. FIGS. 1 to 3 each show only one of the side parts 38 of the carrier element 14 which bound the recess 35, while the other side part, including the guide frame and the holder arranged on the side part, is not depicted.
  • In all positions, the guide strip 4 is subjected to a certain amount of prestressing. This ensures, on the one hand, that the supporting body 2 is secured reliably on the guide strip 4 and, on the other hand, that, when a seated individual applies pressure to the supporting body 2, a sufficient opposing pressure can be built up. The level of prestressing can be set by changing the spacing between the two fastening points 24, 25 of the guide strip 4 on the carrier element 14 with the aid of the operating mechanism 28, and thus by changing the radius of the guide strip 4. In other words, the contact pressure of the supporting body 2 can be adapted individually to the seated individual's requirements by virtue of the prestressing of the guide strip 4 being altered. By virtue of the curved shape of the guide strip 4, height adjustment of the supporting body 2 in the vertical direction 11 simultaneously brings about a change in the inclination of the supporting body.
  • A further embodiment of the invention, which is not illustrated, provides an undulating profile on the front side and/or rear side of the guide strip 4 such that, during height adjustment of the supporting body 2, clamping beads 8 and/or clamping crosspiece 10 move along the undulating profile and multi-step adjustment, of which the user is aware, takes place.
  • Using the basic inventive idea and the embodiments of the invention which have been explained in the description, a person skilled in the art will arrive at a large number of further exemplary embodiments, although these cannot be described in detail here. It should be pointed out, in this context, that all of the features illustrated in the description, the claims and the drawings may be pertinent to the invention both individually and in any desired combination with one another.
    • LIST OF DESIGNATIONS
    • 1 Lumbar support
    • 2 Supporting body
    • 3 Strip holder
    • 4 Guide strip
    • 5 Retaining shell
    • 6 Fastening element
    • 7 Rear side
    • 8 Clamping bead
    • 9 Guide wall
    • 10 Clamping crosspiece
    • 11 Vertical direction
    • 12 Direction of pressure
    • 13 Backrest
    • 14 Carrier element
    • 15 Mounting element
    • 16 Retaining arm
    • 17 Middle carrier
    • 18 Bottom transverse strut
    • 19 Frame
    • 20 Side strut
    • 21 Top transverse strut
    • 22 Fastening element
    • 23 Top end
    • 24 Top fastening point
    • 25 Bottom fastening point
    • 26 Top fastening strut
    • 27 Holder
    • 28 Operating mechanism
    • 29 Bottom fastening strut
    • 30 Clamping jaw
    • 31 Clamping rest
    • 32 Clamping lever
    • 33 Clamping groove
    • 34 Guide frame
    • 35 Recess
    • 36 Clamping-lever end
    • 37 Rear side
    • 38 Side part

Claims (7)

1-5. (canceled)
6. A piece of seating furniture, comprising a flexible guide strip, and a height-adjustable lumbar support disposed on said guide strip.
7. The piece of seating furniture according to claim 6, which comprises a clamping connection fastening said lumbar support on said guide strip.
8. The piece of seating furniture according to claim 6, which comprises a backrest with a central carrier element, wherein said guide strip is fitted on said central carrier element of said backrest of the piece of seating furniture.
9. The piece of seating furniture according to claim 6, wherein said guide strip is a prestressed guide strip.
10. The piece of seating furniture as claimed in claim 9, which comprises means allowing a prestress of said guide strip to be varied.
11. The piece of seating furniture according to claim 6, configured as an office chair.
US11/658,190 2004-07-22 2005-07-20 Piece of Seating Furniture, in Particular Office Chair Abandoned US20090115235A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004035647A DE102004035647B4 (en) 2004-07-22 2004-07-22 Seating furniture, in particular office chair
DE102004035647.5 2004-07-22
PCT/EP2005/007924 WO2006010552A1 (en) 2004-07-22 2005-07-20 Seat, in particular an office chair

Publications (1)

Publication Number Publication Date
US20090115235A1 true US20090115235A1 (en) 2009-05-07

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US11/658,190 Abandoned US20090115235A1 (en) 2004-07-22 2005-07-20 Piece of Seating Furniture, in Particular Office Chair

Country Status (6)

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US (1) US20090115235A1 (en)
EP (1) EP1768518A1 (en)
JP (1) JP2008506486A (en)
CN (1) CN1988829A (en)
DE (1) DE102004035647B4 (en)
WO (1) WO2006010552A1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140210240A1 (en) * 2013-01-31 2014-07-31 Toyota Motor Engineering & Manufacturing North America, Inc. Variable lumbar support assembly
US20150272333A1 (en) * 2012-10-23 2015-10-01 Lear Corporation Thoracic region comfort seating system
US9596941B1 (en) * 2016-02-02 2017-03-21 Office Master Inc. Chair back with height and lumbar adjustment
US10004337B2 (en) * 2015-12-04 2018-06-26 James E. Grove Lumbar stimulation device for a chair
CN108402757A (en) * 2017-02-10 2018-08-17 詹姆斯·E·格罗夫 Waist stimulating apparatus for chair
US10076191B2 (en) * 2017-02-22 2018-09-18 Hsin-Hua Chen Chair back structure
US10299602B2 (en) * 2017-03-22 2019-05-28 Yao-Chuan Wu Chair
USD878107S1 (en) 2018-08-01 2020-03-17 Letronics, Inc. Combination headrest and lumbar support
US10588416B2 (en) * 2018-06-28 2020-03-17 Sue Vanmaastricht Adjustable chair
US11180257B2 (en) * 2016-09-15 2021-11-23 Sleepertech Pty Ltd Aircraft seat
US11337526B2 (en) * 2018-04-19 2022-05-24 Cramer Llc Chair having pliable backrest and methods for same
US20220369816A1 (en) * 2021-05-20 2022-11-24 Comfort Office Furniture Co., Ltd Guangdong Structure for adjusting support force of lumbar pillow, and chair

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US7857388B2 (en) 2007-06-01 2010-12-28 Steelcase Inc. Seating unit with adjustable lumbar device
JP2012070871A (en) * 2010-09-28 2012-04-12 Itoki Corp Chair
JP5687465B2 (en) * 2010-09-29 2015-03-18 株式会社イトーキ Chair with backrest
CN103371657A (en) * 2012-04-27 2013-10-30 蔡芳华 Office seat
EP2719304B1 (en) 2012-10-11 2016-08-10 aeris GmbH Office chair with back rest assembly
DE202012104761U1 (en) 2012-10-11 2013-01-24 Josef Glöckl Back assembly
CN103889274A (en) 2012-10-18 2014-06-25 株式会社冈村制作所 Chair
DE202013002032U1 (en) * 2013-03-01 2014-06-02 Armin Sander Lumbar support of an office chair
JP2017086368A (en) * 2015-11-09 2017-05-25 株式会社イトーキ Chair
JP6990561B2 (en) * 2017-11-06 2022-01-12 株式会社イトーキ Chair
JP7023084B2 (en) * 2017-11-06 2022-02-21 株式会社イトーキ Chair
US11253076B2 (en) * 2019-02-05 2022-02-22 Unchair LLC Chair having open shoulder backrest

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US5054854A (en) * 1990-08-31 1991-10-08 Pruit John D Inflatable structure secured by tension
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10455945B2 (en) * 2012-10-23 2019-10-29 Lear Corporation Thoracic region comfort seating system
US20150272333A1 (en) * 2012-10-23 2015-10-01 Lear Corporation Thoracic region comfort seating system
US8973994B2 (en) * 2013-01-31 2015-03-10 Toyota Motor Engineering & Manufacturing North America, Inc. Variable lumbar support assembly
US20140210240A1 (en) * 2013-01-31 2014-07-31 Toyota Motor Engineering & Manufacturing North America, Inc. Variable lumbar support assembly
US10004337B2 (en) * 2015-12-04 2018-06-26 James E. Grove Lumbar stimulation device for a chair
US9596941B1 (en) * 2016-02-02 2017-03-21 Office Master Inc. Chair back with height and lumbar adjustment
US9968199B2 (en) 2016-02-02 2018-05-15 Office Master Inc. Chair back with height and lumbar adjustment
US11180257B2 (en) * 2016-09-15 2021-11-23 Sleepertech Pty Ltd Aircraft seat
CN108402757A (en) * 2017-02-10 2018-08-17 詹姆斯·E·格罗夫 Waist stimulating apparatus for chair
US10076191B2 (en) * 2017-02-22 2018-09-18 Hsin-Hua Chen Chair back structure
US10299602B2 (en) * 2017-03-22 2019-05-28 Yao-Chuan Wu Chair
US11337526B2 (en) * 2018-04-19 2022-05-24 Cramer Llc Chair having pliable backrest and methods for same
US11779121B2 (en) 2018-04-19 2023-10-10 Cramer Llc Chair having pliable backrest and methods for same
US10588416B2 (en) * 2018-06-28 2020-03-17 Sue Vanmaastricht Adjustable chair
USD878107S1 (en) 2018-08-01 2020-03-17 Letronics, Inc. Combination headrest and lumbar support
US20220369816A1 (en) * 2021-05-20 2022-11-24 Comfort Office Furniture Co., Ltd Guangdong Structure for adjusting support force of lumbar pillow, and chair
US11617445B2 (en) * 2021-05-20 2023-04-04 Comfort Office Furniture Co., Ltd Guangdong Structure for adjusting support force of lumbar pillow, and chair

Also Published As

Publication number Publication date
CN1988829A (en) 2007-06-27
EP1768518A1 (en) 2007-04-04
DE102004035647A1 (en) 2006-02-16
WO2006010552A1 (en) 2006-02-02
JP2008506486A (en) 2008-03-06
DE102004035647B4 (en) 2008-03-20

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